maatkit 7540-1 / usr / bin / mk-query-digest

#!/usr/bin/env perl

# This program is copyright 2007-2011 Percona Inc.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2; OR the Perl Artistic License.  On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307  USA.

use strict;
use warnings FATAL => 'all';

our $VERSION = '0.9.29';
our $DISTRIB = '7540';
our $SVN_REV = sprintf("%d", (q$Revision: 7531 $ =~ m/(\d+)/g, 0));

# ###########################################################################
# DSNParser package 7388
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/DSNParser.pm
#   trunk/common/t/DSNParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package DSNParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use Data::Dumper;
$Data::Dumper::Indent    = 0;
$Data::Dumper::Quotekeys = 0;

eval {
   require DBI;
};
my $have_dbi = $EVAL_ERROR ? 0 : 1;


sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(opts) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $self = {
      opts => {}  # h, P, u, etc.  Should come from DSN OPTIONS section in POD.
   };
   foreach my $opt ( @{$args{opts}} ) {
      if ( !$opt->{key} || !$opt->{desc} ) {
         die "Invalid DSN option: ", Dumper($opt);
      }
      MKDEBUG && _d('DSN option:',
         join(', ',
            map { "$_=" . (defined $opt->{$_} ? ($opt->{$_} || '') : 'undef') }
               keys %$opt
         )
      );
      $self->{opts}->{$opt->{key}} = {
         dsn  => $opt->{dsn},
         desc => $opt->{desc},
         copy => $opt->{copy} || 0,
      };
   }
   return bless $self, $class;
}

sub prop {
   my ( $self, $prop, $value ) = @_;
   if ( @_ > 2 ) {
      MKDEBUG && _d('Setting', $prop, 'property');
      $self->{$prop} = $value;
   }
   return $self->{$prop};
}

sub parse {
   my ( $self, $dsn, $prev, $defaults ) = @_;
   if ( !$dsn ) {
      MKDEBUG && _d('No DSN to parse');
      return;
   }
   MKDEBUG && _d('Parsing', $dsn);
   $prev     ||= {};
   $defaults ||= {};
   my %given_props;
   my %final_props;
   my $opts = $self->{opts};

   foreach my $dsn_part ( split(/,/, $dsn) ) {
      if ( my ($prop_key, $prop_val) = $dsn_part =~  m/^(.)=(.*)$/ ) {
         $given_props{$prop_key} = $prop_val;
      }
      else {
         MKDEBUG && _d('Interpreting', $dsn_part, 'as h=', $dsn_part);
         $given_props{h} = $dsn_part;
      }
   }

   foreach my $key ( keys %$opts ) {
      MKDEBUG && _d('Finding value for', $key);
      $final_props{$key} = $given_props{$key};
      if (   !defined $final_props{$key}
           && defined $prev->{$key} && $opts->{$key}->{copy} )
      {
         $final_props{$key} = $prev->{$key};
         MKDEBUG && _d('Copying value for', $key, 'from previous DSN');
      }
      if ( !defined $final_props{$key} ) {
         $final_props{$key} = $defaults->{$key};
         MKDEBUG && _d('Copying value for', $key, 'from defaults');
      }
   }

   foreach my $key ( keys %given_props ) {
      die "Unknown DSN option '$key' in '$dsn'.  For more details, "
            . "please use the --help option, or try 'perldoc $PROGRAM_NAME' "
            . "for complete documentation."
         unless exists $opts->{$key};
   }
   if ( (my $required = $self->prop('required')) ) {
      foreach my $key ( keys %$required ) {
         die "Missing required DSN option '$key' in '$dsn'.  For more details, "
               . "please use the --help option, or try 'perldoc $PROGRAM_NAME' "
               . "for complete documentation."
            unless $final_props{$key};
      }
   }

   return \%final_props;
}

sub parse_options {
   my ( $self, $o ) = @_;
   die 'I need an OptionParser object' unless ref $o eq 'OptionParser';
   my $dsn_string
      = join(',',
          map  { "$_=".$o->get($_); }
          grep { $o->has($_) && $o->get($_) }
          keys %{$self->{opts}}
        );
   MKDEBUG && _d('DSN string made from options:', $dsn_string);
   return $self->parse($dsn_string);
}

sub as_string {
   my ( $self, $dsn, $props ) = @_;
   return $dsn unless ref $dsn;
   my %allowed = $props ? map { $_=>1 } @$props : ();
   return join(',',
      map  { "$_=" . ($_ eq 'p' ? '...' : $dsn->{$_})  }
      grep { defined $dsn->{$_} && $self->{opts}->{$_} }
      grep { !$props || $allowed{$_}                   }
      sort keys %$dsn );
}

sub usage {
   my ( $self ) = @_;
   my $usage
      = "DSN syntax is key=value[,key=value...]  Allowable DSN keys:\n\n"
      . "  KEY  COPY  MEANING\n"
      . "  ===  ====  =============================================\n";
   my %opts = %{$self->{opts}};
   foreach my $key ( sort keys %opts ) {
      $usage .= "  $key    "
             .  ($opts{$key}->{copy} ? 'yes   ' : 'no    ')
             .  ($opts{$key}->{desc} || '[No description]')
             . "\n";
   }
   $usage .= "\n  If the DSN is a bareword, the word is treated as the 'h' key.\n";
   return $usage;
}

sub get_cxn_params {
   my ( $self, $info ) = @_;
   my $dsn;
   my %opts = %{$self->{opts}};
   my $driver = $self->prop('dbidriver') || '';
   if ( $driver eq 'Pg' ) {
      $dsn = 'DBI:Pg:dbname=' . ( $info->{D} || '' ) . ';'
         . join(';', map  { "$opts{$_}->{dsn}=$info->{$_}" }
                     grep { defined $info->{$_} }
                     qw(h P));
   }
   else {
      $dsn = 'DBI:mysql:' . ( $info->{D} || '' ) . ';'
         . join(';', map  { "$opts{$_}->{dsn}=$info->{$_}" }
                     grep { defined $info->{$_} }
                     qw(F h P S A))
         . ';mysql_read_default_group=client';
   }
   MKDEBUG && _d($dsn);
   return ($dsn, $info->{u}, $info->{p});
}

sub fill_in_dsn {
   my ( $self, $dbh, $dsn ) = @_;
   my $vars = $dbh->selectall_hashref('SHOW VARIABLES', 'Variable_name');
   my ($user, $db) = $dbh->selectrow_array('SELECT USER(), DATABASE()');
   $user =~ s/@.*//;
   $dsn->{h} ||= $vars->{hostname}->{Value};
   $dsn->{S} ||= $vars->{'socket'}->{Value};
   $dsn->{P} ||= $vars->{port}->{Value};
   $dsn->{u} ||= $user;
   $dsn->{D} ||= $db;
}

sub get_dbh {
   my ( $self, $cxn_string, $user, $pass, $opts ) = @_;
   $opts ||= {};
   my $defaults = {
      AutoCommit         => 0,
      RaiseError         => 1,
      PrintError         => 0,
      ShowErrorStatement => 1,
      mysql_enable_utf8 => ($cxn_string =~ m/charset=utf8/i ? 1 : 0),
   };
   @{$defaults}{ keys %$opts } = values %$opts;

   if ( $opts->{mysql_use_result} ) {
      $defaults->{mysql_use_result} = 1;
   }

   if ( !$have_dbi ) {
      die "Cannot connect to MySQL because the Perl DBI module is not "
         . "installed or not found.  Run 'perl -MDBI' to see the directories "
         . "that Perl searches for DBI.  If DBI is not installed, try:\n"
         . "  Debian/Ubuntu  apt-get install libdbi-perl\n"
         . "  RHEL/CentOS    yum install perl-DBI\n"
         . "  OpenSolaris    pgk install pkg:/SUNWpmdbi\n";

   }

   my $dbh;
   my $tries = 2;
   while ( !$dbh && $tries-- ) {
      MKDEBUG && _d($cxn_string, ' ', $user, ' ', $pass, ' {',
         join(', ', map { "$_=>$defaults->{$_}" } keys %$defaults ), '}');

      eval {
         $dbh = DBI->connect($cxn_string, $user, $pass, $defaults);

         if ( $cxn_string =~ m/mysql/i ) {
            my $sql;

            $sql = 'SELECT @@SQL_MODE';
            MKDEBUG && _d($dbh, $sql);
            my ($sql_mode) = $dbh->selectrow_array($sql);

            $sql = 'SET @@SQL_QUOTE_SHOW_CREATE = 1'
                 . '/*!40101, @@SQL_MODE=\'NO_AUTO_VALUE_ON_ZERO'
                 . ($sql_mode ? ",$sql_mode" : '')
                 . '\'*/';
            MKDEBUG && _d($dbh, $sql);
            $dbh->do($sql);

            if ( my ($charset) = $cxn_string =~ m/charset=(\w+)/ ) {
               $sql = "/*!40101 SET NAMES $charset*/";
               MKDEBUG && _d($dbh, ':', $sql);
               $dbh->do($sql);
               MKDEBUG && _d('Enabling charset for STDOUT');
               if ( $charset eq 'utf8' ) {
                  binmode(STDOUT, ':utf8')
                     or die "Can't binmode(STDOUT, ':utf8'): $OS_ERROR";
               }
               else {
                  binmode(STDOUT) or die "Can't binmode(STDOUT): $OS_ERROR";
               }
            }

            if ( $self->prop('set-vars') ) {
               $sql = "SET " . $self->prop('set-vars');
               MKDEBUG && _d($dbh, ':', $sql);
               $dbh->do($sql);
            }
         }
      };
      if ( !$dbh && $EVAL_ERROR ) {
         MKDEBUG && _d($EVAL_ERROR);
         if ( $EVAL_ERROR =~ m/not a compiled character set|character set utf8/ ) {
            MKDEBUG && _d('Going to try again without utf8 support');
            delete $defaults->{mysql_enable_utf8};
         }
         elsif ( $EVAL_ERROR =~ m/locate DBD\/mysql/i ) {
            die "Cannot connect to MySQL because the Perl DBD::mysql module is "
               . "not installed or not found.  Run 'perl -MDBD::mysql' to see "
               . "the directories that Perl searches for DBD::mysql.  If "
               . "DBD::mysql is not installed, try:\n"
               . "  Debian/Ubuntu  apt-get install libdbd-mysql-perl\n"
               . "  RHEL/CentOS    yum install perl-DBD-MySQL\n"
               . "  OpenSolaris    pgk install pkg:/SUNWapu13dbd-mysql\n";
         }
         if ( !$tries ) {
            die $EVAL_ERROR;
         }
      }
   }

   MKDEBUG && _d('DBH info: ',
      $dbh,
      Dumper($dbh->selectrow_hashref(
         'SELECT DATABASE(), CONNECTION_ID(), VERSION()/*!50038 , @@hostname*/')),
      'Connection info:',      $dbh->{mysql_hostinfo},
      'Character set info:',   Dumper($dbh->selectall_arrayref(
                     'SHOW VARIABLES LIKE "character_set%"', { Slice => {}})),
      '$DBD::mysql::VERSION:', $DBD::mysql::VERSION,
      '$DBI::VERSION:',        $DBI::VERSION,
   );

   return $dbh;
}

sub get_hostname {
   my ( $self, $dbh ) = @_;
   if ( my ($host) = ($dbh->{mysql_hostinfo} || '') =~ m/^(\w+) via/ ) {
      return $host;
   }
   my ( $hostname, $one ) = $dbh->selectrow_array(
      'SELECT /*!50038 @@hostname, */ 1');
   return $hostname;
}

sub disconnect {
   my ( $self, $dbh ) = @_;
   MKDEBUG && $self->print_active_handles($dbh);
   $dbh->disconnect;
}

sub print_active_handles {
   my ( $self, $thing, $level ) = @_;
   $level ||= 0;
   printf("# Active %sh: %s %s %s\n", ($thing->{Type} || 'undef'), "\t" x $level,
      $thing, (($thing->{Type} || '') eq 'st' ? $thing->{Statement} || '' : ''))
      or die "Cannot print: $OS_ERROR";
   foreach my $handle ( grep {defined} @{ $thing->{ChildHandles} } ) {
      $self->print_active_handles( $handle, $level + 1 );
   }
}

sub copy {
   my ( $self, $dsn_1, $dsn_2, %args ) = @_;
   die 'I need a dsn_1 argument' unless $dsn_1;
   die 'I need a dsn_2 argument' unless $dsn_2;
   my %new_dsn = map {
      my $key = $_;
      my $val;
      if ( $args{overwrite} ) {
         $val = defined $dsn_1->{$key} ? $dsn_1->{$key} : $dsn_2->{$key};
      }
      else {
         $val = defined $dsn_2->{$key} ? $dsn_2->{$key} : $dsn_1->{$key};
      }
      $key => $val;
   } keys %{$self->{opts}};
   return \%new_dsn;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End DSNParser package
# ###########################################################################

# ###########################################################################
# Quoter package 6850
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Quoter.pm
#   trunk/common/t/Quoter.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package Quoter;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   return bless {}, $class;
}

sub quote {
   my ( $self, @vals ) = @_;
   foreach my $val ( @vals ) {
      $val =~ s/`/``/g;
   }
   return join('.', map { '`' . $_ . '`' } @vals);
}

sub quote_val {
   my ( $self, $val ) = @_;

   return 'NULL' unless defined $val;          # undef = NULL
   return "''" if $val eq '';                  # blank string = ''
   return $val if $val =~ m/^0x[0-9a-fA-F]+$/;  # hex data

   $val =~ s/(['\\])/\\$1/g;
   return "'$val'";
}

sub split_unquote {
   my ( $self, $db_tbl, $default_db ) = @_;
   $db_tbl =~ s/`//g;
   my ( $db, $tbl ) = split(/[.]/, $db_tbl);
   if ( !$tbl ) {
      $tbl = $db;
      $db  = $default_db;
   }
   return ($db, $tbl);
}

sub literal_like {
   my ( $self, $like ) = @_;
   return unless $like;
   $like =~ s/([%_])/\\$1/g;
   return "'$like'";
}

sub join_quote {
   my ( $self, $default_db, $db_tbl ) = @_;
   return unless $db_tbl;
   my ($db, $tbl) = split(/[.]/, $db_tbl);
   if ( !$tbl ) {
      $tbl = $db;
      $db  = $default_db;
   }
   $db  = "`$db`"  if $db  && $db  !~ m/^`/;
   $tbl = "`$tbl`" if $tbl && $tbl !~ m/^`/;
   return $db ? "$db.$tbl" : $tbl;
}

1;

# ###########################################################################
# End Quoter package
# ###########################################################################

# ###########################################################################
# OptionParser package 7102
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/OptionParser.pm
#   trunk/common/t/OptionParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package OptionParser;

use strict;
use warnings FATAL => 'all';
use List::Util qw(max);
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use Getopt::Long;

my $POD_link_re = '[LC]<"?([^">]+)"?>';

sub new {
   my ( $class, %args ) = @_;
   my @required_args = qw();
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   my ($program_name) = $PROGRAM_NAME =~ m/([.A-Za-z-]+)$/;
   $program_name ||= $PROGRAM_NAME;
   my $home = $ENV{HOME} || $ENV{HOMEPATH} || $ENV{USERPROFILE} || '.';

   my %attributes = (
      'type'       => 1,
      'short form' => 1,
      'group'      => 1,
      'default'    => 1,
      'cumulative' => 1,
      'negatable'  => 1,
   );

   my $self = {
      head1             => 'OPTIONS',        # These args are used internally
      skip_rules        => 0,                # to instantiate another Option-
      item              => '--(.*)',         # Parser obj that parses the
      attributes        => \%attributes,     # DSN OPTIONS section.  Tools
      parse_attributes  => \&_parse_attribs, # don't tinker with these args.

      %args,

      strict            => 1,  # disabled by a special rule
      program_name      => $program_name,
      opts              => {},
      got_opts          => 0,
      short_opts        => {},
      defaults          => {},
      groups            => {},
      allowed_groups    => {},
      errors            => [],
      rules             => [],  # desc of rules for --help
      mutex             => [],  # rule: opts are mutually exclusive
      atleast1          => [],  # rule: at least one opt is required
      disables          => {},  # rule: opt disables other opts 
      defaults_to       => {},  # rule: opt defaults to value of other opt
      DSNParser         => undef,
      default_files     => [
         "/etc/maatkit/maatkit.conf",
         "/etc/maatkit/$program_name.conf",
         "$home/.maatkit.conf",
         "$home/.$program_name.conf",
      ],
      types             => {
         string => 's', # standard Getopt type
         int    => 'i', # standard Getopt type
         float  => 'f', # standard Getopt type
         Hash   => 'H', # hash, formed from a comma-separated list
         hash   => 'h', # hash as above, but only if a value is given
         Array  => 'A', # array, similar to Hash
         array  => 'a', # array, similar to hash
         DSN    => 'd', # DSN
         size   => 'z', # size with kMG suffix (powers of 2^10)
         time   => 'm', # time, with an optional suffix of s/h/m/d
      },
   };

   return bless $self, $class;
}

sub get_specs {
   my ( $self, $file ) = @_;
   $file ||= $self->{file} || __FILE__;
   my @specs = $self->_pod_to_specs($file);
   $self->_parse_specs(@specs);

   open my $fh, "<", $file or die "Cannot open $file: $OS_ERROR";
   my $contents = do { local $/ = undef; <$fh> };
   close $fh;
   if ( $contents =~ m/^=head1 DSN OPTIONS/m ) {
      MKDEBUG && _d('Parsing DSN OPTIONS');
      my $dsn_attribs = {
         dsn  => 1,
         copy => 1,
      };
      my $parse_dsn_attribs = sub {
         my ( $self, $option, $attribs ) = @_;
         map {
            my $val = $attribs->{$_};
            if ( $val ) {
               $val    = $val eq 'yes' ? 1
                       : $val eq 'no'  ? 0
                       :                 $val;
               $attribs->{$_} = $val;
            }
         } keys %$attribs;
         return {
            key => $option,
            %$attribs,
         };
      };
      my $dsn_o = new OptionParser(
         description       => 'DSN OPTIONS',
         head1             => 'DSN OPTIONS',
         dsn               => 0,         # XXX don't infinitely recurse!
         item              => '\* (.)',  # key opts are a single character
         skip_rules        => 1,         # no rules before opts
         attributes        => $dsn_attribs,
         parse_attributes  => $parse_dsn_attribs,
      );
      my @dsn_opts = map {
         my $opts = {
            key  => $_->{spec}->{key},
            dsn  => $_->{spec}->{dsn},
            copy => $_->{spec}->{copy},
            desc => $_->{desc},
         };
         $opts;
      } $dsn_o->_pod_to_specs($file);
      $self->{DSNParser} = DSNParser->new(opts => \@dsn_opts);
   }

   return;
}

sub DSNParser {
   my ( $self ) = @_;
   return $self->{DSNParser};
};

sub get_defaults_files {
   my ( $self ) = @_;
   return @{$self->{default_files}};
}

sub _pod_to_specs {
   my ( $self, $file ) = @_;
   $file ||= $self->{file} || __FILE__;
   open my $fh, '<', $file or die "Cannot open $file: $OS_ERROR";

   my @specs = ();
   my @rules = ();
   my $para;

   local $INPUT_RECORD_SEPARATOR = '';
   while ( $para = <$fh> ) {
      next unless $para =~ m/^=head1 $self->{head1}/;
      last;
   }

   while ( $para = <$fh> ) {
      last if $para =~ m/^=over/;
      next if $self->{skip_rules};
      chomp $para;
      $para =~ s/\s+/ /g;
      $para =~ s/$POD_link_re/$1/go;
      MKDEBUG && _d('Option rule:', $para);
      push @rules, $para;
   }

   die "POD has no $self->{head1} section" unless $para;

   do {
      if ( my ($option) = $para =~ m/^=item $self->{item}/ ) {
         chomp $para;
         MKDEBUG && _d($para);
         my %attribs;

         $para = <$fh>; # read next paragraph, possibly attributes

         if ( $para =~ m/: / ) { # attributes
            $para =~ s/\s+\Z//g;
            %attribs = map {
                  my ( $attrib, $val) = split(/: /, $_);
                  die "Unrecognized attribute for --$option: $attrib"
                     unless $self->{attributes}->{$attrib};
                  ($attrib, $val);
               } split(/; /, $para);
            if ( $attribs{'short form'} ) {
               $attribs{'short form'} =~ s/-//;
            }
            $para = <$fh>; # read next paragraph, probably short help desc
         }
         else {
            MKDEBUG && _d('Option has no attributes');
         }

         $para =~ s/\s+\Z//g;
         $para =~ s/\s+/ /g;
         $para =~ s/$POD_link_re/$1/go;

         $para =~ s/\.(?:\n.*| [A-Z].*|\Z)//s;
         MKDEBUG && _d('Short help:', $para);

         die "No description after option spec $option" if $para =~ m/^=item/;

         if ( my ($base_option) =  $option =~ m/^\[no\](.*)/ ) {
            $option = $base_option;
            $attribs{'negatable'} = 1;
         }

         push @specs, {
            spec  => $self->{parse_attributes}->($self, $option, \%attribs), 
            desc  => $para
               . (defined $attribs{default} ? " (default $attribs{default})" : ''),
            group => ($attribs{'group'} ? $attribs{'group'} : 'default'),
         };
      }
      while ( $para = <$fh> ) {
         last unless $para;
         if ( $para =~ m/^=head1/ ) {
            $para = undef; # Can't 'last' out of a do {} block.
            last;
         }
         last if $para =~ m/^=item /;
      }
   } while ( $para );

   die "No valid specs in $self->{head1}" unless @specs;

   close $fh;
   return @specs, @rules;
}

sub _parse_specs {
   my ( $self, @specs ) = @_;
   my %disables; # special rule that requires deferred checking

   foreach my $opt ( @specs ) {
      if ( ref $opt ) { # It's an option spec, not a rule.
         MKDEBUG && _d('Parsing opt spec:',
            map { ($_, '=>', $opt->{$_}) } keys %$opt);

         my ( $long, $short ) = $opt->{spec} =~ m/^([\w-]+)(?:\|([^!+=]*))?/;
         if ( !$long ) {
            die "Cannot parse long option from spec $opt->{spec}";
         }
         $opt->{long} = $long;

         die "Duplicate long option --$long" if exists $self->{opts}->{$long};
         $self->{opts}->{$long} = $opt;

         if ( length $long == 1 ) {
            MKDEBUG && _d('Long opt', $long, 'looks like short opt');
            $self->{short_opts}->{$long} = $long;
         }

         if ( $short ) {
            die "Duplicate short option -$short"
               if exists $self->{short_opts}->{$short};
            $self->{short_opts}->{$short} = $long;
            $opt->{short} = $short;
         }
         else {
            $opt->{short} = undef;
         }

         $opt->{is_negatable}  = $opt->{spec} =~ m/!/        ? 1 : 0;
         $opt->{is_cumulative} = $opt->{spec} =~ m/\+/       ? 1 : 0;
         $opt->{is_required}   = $opt->{desc} =~ m/required/ ? 1 : 0;

         $opt->{group} ||= 'default';
         $self->{groups}->{ $opt->{group} }->{$long} = 1;

         $opt->{value} = undef;
         $opt->{got}   = 0;

         my ( $type ) = $opt->{spec} =~ m/=(.)/;
         $opt->{type} = $type;
         MKDEBUG && _d($long, 'type:', $type);


         $opt->{spec} =~ s/=./=s/ if ( $type && $type =~ m/[HhAadzm]/ );

         if ( (my ($def) = $opt->{desc} =~ m/default\b(?: ([^)]+))?/) ) {
            $self->{defaults}->{$long} = defined $def ? $def : 1;
            MKDEBUG && _d($long, 'default:', $def);
         }

         if ( $long eq 'config' ) {
            $self->{defaults}->{$long} = join(',', $self->get_defaults_files());
         }

         if ( (my ($dis) = $opt->{desc} =~ m/(disables .*)/) ) {
            $disables{$long} = $dis;
            MKDEBUG && _d('Deferring check of disables rule for', $opt, $dis);
         }

         $self->{opts}->{$long} = $opt;
      }
      else { # It's an option rule, not a spec.
         MKDEBUG && _d('Parsing rule:', $opt); 
         push @{$self->{rules}}, $opt;
         my @participants = $self->_get_participants($opt);
         my $rule_ok = 0;

         if ( $opt =~ m/mutually exclusive|one and only one/ ) {
            $rule_ok = 1;
            push @{$self->{mutex}}, \@participants;
            MKDEBUG && _d(@participants, 'are mutually exclusive');
         }
         if ( $opt =~ m/at least one|one and only one/ ) {
            $rule_ok = 1;
            push @{$self->{atleast1}}, \@participants;
            MKDEBUG && _d(@participants, 'require at least one');
         }
         if ( $opt =~ m/default to/ ) {
            $rule_ok = 1;
            $self->{defaults_to}->{$participants[0]} = $participants[1];
            MKDEBUG && _d($participants[0], 'defaults to', $participants[1]);
         }
         if ( $opt =~ m/restricted to option groups/ ) {
            $rule_ok = 1;
            my ($groups) = $opt =~ m/groups ([\w\s\,]+)/;
            my @groups = split(',', $groups);
            %{$self->{allowed_groups}->{$participants[0]}} = map {
               s/\s+//;
               $_ => 1;
            } @groups;
         }
         if( $opt =~ m/accepts additional command-line arguments/ ) {
            $rule_ok = 1;
            $self->{strict} = 0;
            MKDEBUG && _d("Strict mode disabled by rule");
         }

         die "Unrecognized option rule: $opt" unless $rule_ok;
      }
   }

   foreach my $long ( keys %disables ) {
      my @participants = $self->_get_participants($disables{$long});
      $self->{disables}->{$long} = \@participants;
      MKDEBUG && _d('Option', $long, 'disables', @participants);
   }

   return; 
}

sub _get_participants {
   my ( $self, $str ) = @_;
   my @participants;
   foreach my $long ( $str =~ m/--(?:\[no\])?([\w-]+)/g ) {
      die "Option --$long does not exist while processing rule $str"
         unless exists $self->{opts}->{$long};
      push @participants, $long;
   }
   MKDEBUG && _d('Participants for', $str, ':', @participants);
   return @participants;
}

sub opts {
   my ( $self ) = @_;
   my %opts = %{$self->{opts}};
   return %opts;
}

sub short_opts {
   my ( $self ) = @_;
   my %short_opts = %{$self->{short_opts}};
   return %short_opts;
}

sub set_defaults {
   my ( $self, %defaults ) = @_;
   $self->{defaults} = {};
   foreach my $long ( keys %defaults ) {
      die "Cannot set default for nonexistent option $long"
         unless exists $self->{opts}->{$long};
      $self->{defaults}->{$long} = $defaults{$long};
      MKDEBUG && _d('Default val for', $long, ':', $defaults{$long});
   }
   return;
}

sub get_defaults {
   my ( $self ) = @_;
   return $self->{defaults};
}

sub get_groups {
   my ( $self ) = @_;
   return $self->{groups};
}

sub _set_option {
   my ( $self, $opt, $val ) = @_;
   my $long = exists $self->{opts}->{$opt}       ? $opt
            : exists $self->{short_opts}->{$opt} ? $self->{short_opts}->{$opt}
            : die "Getopt::Long gave a nonexistent option: $opt";

   $opt = $self->{opts}->{$long};
   if ( $opt->{is_cumulative} ) {
      $opt->{value}++;
   }
   else {
      $opt->{value} = $val;
   }
   $opt->{got} = 1;
   MKDEBUG && _d('Got option', $long, '=', $val);
}

sub get_opts {
   my ( $self ) = @_; 

   foreach my $long ( keys %{$self->{opts}} ) {
      $self->{opts}->{$long}->{got} = 0;
      $self->{opts}->{$long}->{value}
         = exists $self->{defaults}->{$long}       ? $self->{defaults}->{$long}
         : $self->{opts}->{$long}->{is_cumulative} ? 0
         : undef;
   }
   $self->{got_opts} = 0;

   $self->{errors} = [];

   if ( @ARGV && $ARGV[0] eq "--config" ) {
      shift @ARGV;
      $self->_set_option('config', shift @ARGV);
   }
   if ( $self->has('config') ) {
      my @extra_args;
      foreach my $filename ( split(',', $self->get('config')) ) {
         eval {
            push @extra_args, $self->_read_config_file($filename);
         };
         if ( $EVAL_ERROR ) {
            if ( $self->got('config') ) {
               die $EVAL_ERROR;
            }
            elsif ( MKDEBUG ) {
               _d($EVAL_ERROR);
            }
         }
      }
      unshift @ARGV, @extra_args;
   }

   Getopt::Long::Configure('no_ignore_case', 'bundling');
   GetOptions(
      map    { $_->{spec} => sub { $self->_set_option(@_); } }
      grep   { $_->{long} ne 'config' } # --config is handled specially above.
      values %{$self->{opts}}
   ) or $self->save_error('Error parsing options');

   if ( exists $self->{opts}->{version} && $self->{opts}->{version}->{got} ) {
      printf("%s  Ver %s Distrib %s Changeset %s\n",
         $self->{program_name}, $main::VERSION, $main::DISTRIB, $main::SVN_REV)
            or die "Cannot print: $OS_ERROR";
      exit 0;
   }

   if ( @ARGV && $self->{strict} ) {
      $self->save_error("Unrecognized command-line options @ARGV");
   }

   foreach my $mutex ( @{$self->{mutex}} ) {
      my @set = grep { $self->{opts}->{$_}->{got} } @$mutex;
      if ( @set > 1 ) {
         my $err = join(', ', map { "--$self->{opts}->{$_}->{long}" }
                      @{$mutex}[ 0 .. scalar(@$mutex) - 2] )
                 . ' and --'.$self->{opts}->{$mutex->[-1]}->{long}
                 . ' are mutually exclusive.';
         $self->save_error($err);
      }
   }

   foreach my $required ( @{$self->{atleast1}} ) {
      my @set = grep { $self->{opts}->{$_}->{got} } @$required;
      if ( @set == 0 ) {
         my $err = join(', ', map { "--$self->{opts}->{$_}->{long}" }
                      @{$required}[ 0 .. scalar(@$required) - 2] )
                 .' or --'.$self->{opts}->{$required->[-1]}->{long};
         $self->save_error("Specify at least one of $err");
      }
   }

   $self->_check_opts( keys %{$self->{opts}} );
   $self->{got_opts} = 1;
   return;
}

sub _check_opts {
   my ( $self, @long ) = @_;
   my $long_last = scalar @long;
   while ( @long ) {
      foreach my $i ( 0..$#long ) {
         my $long = $long[$i];
         next unless $long;
         my $opt  = $self->{opts}->{$long};
         if ( $opt->{got} ) {
            if ( exists $self->{disables}->{$long} ) {
               my @disable_opts = @{$self->{disables}->{$long}};
               map { $self->{opts}->{$_}->{value} = undef; } @disable_opts;
               MKDEBUG && _d('Unset options', @disable_opts,
                  'because', $long,'disables them');
            }

            if ( exists $self->{allowed_groups}->{$long} ) {

               my @restricted_groups = grep {
                  !exists $self->{allowed_groups}->{$long}->{$_}
               } keys %{$self->{groups}};

               my @restricted_opts;
               foreach my $restricted_group ( @restricted_groups ) {
                  RESTRICTED_OPT:
                  foreach my $restricted_opt (
                     keys %{$self->{groups}->{$restricted_group}} )
                  {
                     next RESTRICTED_OPT if $restricted_opt eq $long;
                     push @restricted_opts, $restricted_opt
                        if $self->{opts}->{$restricted_opt}->{got};
                  }
               }

               if ( @restricted_opts ) {
                  my $err;
                  if ( @restricted_opts == 1 ) {
                     $err = "--$restricted_opts[0]";
                  }
                  else {
                     $err = join(', ',
                               map { "--$self->{opts}->{$_}->{long}" }
                               grep { $_ } 
                               @restricted_opts[0..scalar(@restricted_opts) - 2]
                            )
                          . ' or --'.$self->{opts}->{$restricted_opts[-1]}->{long};
                  }
                  $self->save_error("--$long is not allowed with $err");
               }
            }

         }
         elsif ( $opt->{is_required} ) { 
            $self->save_error("Required option --$long must be specified");
         }

         $self->_validate_type($opt);
         if ( $opt->{parsed} ) {
            delete $long[$i];
         }
         else {
            MKDEBUG && _d('Temporarily failed to parse', $long);
         }
      }

      die "Failed to parse options, possibly due to circular dependencies"
         if @long == $long_last;
      $long_last = @long;
   }

   return;
}

sub _validate_type {
   my ( $self, $opt ) = @_;
   return unless $opt;

   if ( !$opt->{type} ) {
      $opt->{parsed} = 1;
      return;
   }

   my $val = $opt->{value};

   if ( $val && $opt->{type} eq 'm' ) {  # type time
      MKDEBUG && _d('Parsing option', $opt->{long}, 'as a time value');
      my ( $prefix, $num, $suffix ) = $val =~ m/([+-]?)(\d+)([a-z])?$/;
      if ( !$suffix ) {
         my ( $s ) = $opt->{desc} =~ m/\(suffix (.)\)/;
         $suffix = $s || 's';
         MKDEBUG && _d('No suffix given; using', $suffix, 'for',
            $opt->{long}, '(value:', $val, ')');
      }
      if ( $suffix =~ m/[smhd]/ ) {
         $val = $suffix eq 's' ? $num            # Seconds
              : $suffix eq 'm' ? $num * 60       # Minutes
              : $suffix eq 'h' ? $num * 3600     # Hours
              :                  $num * 86400;   # Days
         $opt->{value} = ($prefix || '') . $val;
         MKDEBUG && _d('Setting option', $opt->{long}, 'to', $val);
      }
      else {
         $self->save_error("Invalid time suffix for --$opt->{long}");
      }
   }
   elsif ( $val && $opt->{type} eq 'd' ) {  # type DSN
      MKDEBUG && _d('Parsing option', $opt->{long}, 'as a DSN');
      my $prev = {};
      my $from_key = $self->{defaults_to}->{ $opt->{long} };
      if ( $from_key ) {
         MKDEBUG && _d($opt->{long}, 'DSN copies from', $from_key, 'DSN');
         if ( $self->{opts}->{$from_key}->{parsed} ) {
            $prev = $self->{opts}->{$from_key}->{value};
         }
         else {
            MKDEBUG && _d('Cannot parse', $opt->{long}, 'until',
               $from_key, 'parsed');
            return;
         }
      }
      my $defaults = $self->{DSNParser}->parse_options($self);
      $opt->{value} = $self->{DSNParser}->parse($val, $prev, $defaults);
   }
   elsif ( $val && $opt->{type} eq 'z' ) {  # type size
      MKDEBUG && _d('Parsing option', $opt->{long}, 'as a size value');
      $self->_parse_size($opt, $val);
   }
   elsif ( $opt->{type} eq 'H' || (defined $val && $opt->{type} eq 'h') ) {
      $opt->{value} = { map { $_ => 1 } split(/(?<!\\),\s*/, ($val || '')) };
   }
   elsif ( $opt->{type} eq 'A' || (defined $val && $opt->{type} eq 'a') ) {
      $opt->{value} = [ split(/(?<!\\),\s*/, ($val || '')) ];
   }
   else {
      MKDEBUG && _d('Nothing to validate for option',
         $opt->{long}, 'type', $opt->{type}, 'value', $val);
   }

   $opt->{parsed} = 1;
   return;
}

sub get {
   my ( $self, $opt ) = @_;
   my $long = (length $opt == 1 ? $self->{short_opts}->{$opt} : $opt);
   die "Option $opt does not exist"
      unless $long && exists $self->{opts}->{$long};
   return $self->{opts}->{$long}->{value};
}

sub got {
   my ( $self, $opt ) = @_;
   my $long = (length $opt == 1 ? $self->{short_opts}->{$opt} : $opt);
   die "Option $opt does not exist"
      unless $long && exists $self->{opts}->{$long};
   return $self->{opts}->{$long}->{got};
}

sub has {
   my ( $self, $opt ) = @_;
   my $long = (length $opt == 1 ? $self->{short_opts}->{$opt} : $opt);
   return defined $long ? exists $self->{opts}->{$long} : 0;
}

sub set {
   my ( $self, $opt, $val ) = @_;
   my $long = (length $opt == 1 ? $self->{short_opts}->{$opt} : $opt);
   die "Option $opt does not exist"
      unless $long && exists $self->{opts}->{$long};
   $self->{opts}->{$long}->{value} = $val;
   return;
}

sub save_error {
   my ( $self, $error ) = @_;
   push @{$self->{errors}}, $error;
   return;
}

sub errors {
   my ( $self ) = @_;
   return $self->{errors};
}

sub usage {
   my ( $self ) = @_;
   warn "No usage string is set" unless $self->{usage}; # XXX
   return "Usage: " . ($self->{usage} || '') . "\n";
}

sub descr {
   my ( $self ) = @_;
   warn "No description string is set" unless $self->{description}; # XXX
   my $descr  = ($self->{description} || $self->{program_name} || '')
              . "  For more details, please use the --help option, "
              . "or try 'perldoc $PROGRAM_NAME' "
              . "for complete documentation.";
   $descr = join("\n", $descr =~ m/(.{0,80})(?:\s+|$)/g)
      unless $ENV{DONT_BREAK_LINES};
   $descr =~ s/ +$//mg;
   return $descr;
}

sub usage_or_errors {
   my ( $self, $file, $return ) = @_;
   $file ||= $self->{file} || __FILE__;

   if ( !$self->{description} || !$self->{usage} ) {
      MKDEBUG && _d("Getting description and usage from SYNOPSIS in", $file);
      my %synop = $self->_parse_synopsis($file);
      $self->{description} ||= $synop{description};
      $self->{usage}       ||= $synop{usage};
      MKDEBUG && _d("Description:", $self->{description},
         "\nUsage:", $self->{usage});
   }

   if ( $self->{opts}->{help}->{got} ) {
      print $self->print_usage() or die "Cannot print usage: $OS_ERROR";
      exit 0 unless $return;
   }
   elsif ( scalar @{$self->{errors}} ) {
      print $self->print_errors() or die "Cannot print errors: $OS_ERROR";
      exit 0 unless $return;
   }

   return;
}

sub print_errors {
   my ( $self ) = @_;
   my $usage = $self->usage() . "\n";
   if ( (my @errors = @{$self->{errors}}) ) {
      $usage .= join("\n  * ", 'Errors in command-line arguments:', @errors)
              . "\n";
   }
   return $usage . "\n" . $self->descr();
}

sub print_usage {
   my ( $self ) = @_;
   die "Run get_opts() before print_usage()" unless $self->{got_opts};
   my @opts = values %{$self->{opts}};

   my $maxl = max(
      map {
         length($_->{long})               # option long name
         + ($_->{is_negatable} ? 4 : 0)   # "[no]" if opt is negatable
         + ($_->{type} ? 2 : 0)           # "=x" where x is the opt type
      }
      @opts);

   my $maxs = max(0,
      map {
         length($_)
         + ($self->{opts}->{$_}->{is_negatable} ? 4 : 0)
         + ($self->{opts}->{$_}->{type} ? 2 : 0)
      }
      values %{$self->{short_opts}});

   my $lcol = max($maxl, ($maxs + 3));
   my $rcol = 80 - $lcol - 6;
   my $rpad = ' ' x ( 80 - $rcol );

   $maxs = max($lcol - 3, $maxs);

   my $usage = $self->descr() . "\n" . $self->usage();

   my @groups = reverse sort grep { $_ ne 'default'; } keys %{$self->{groups}};
   push @groups, 'default';

   foreach my $group ( reverse @groups ) {
      $usage .= "\n".($group eq 'default' ? 'Options' : $group).":\n\n";
      foreach my $opt (
         sort { $a->{long} cmp $b->{long} }
         grep { $_->{group} eq $group }
         @opts )
      {
         my $long  = $opt->{is_negatable} ? "[no]$opt->{long}" : $opt->{long};
         my $short = $opt->{short};
         my $desc  = $opt->{desc};

         $long .= $opt->{type} ? "=$opt->{type}" : "";

         if ( $opt->{type} && $opt->{type} eq 'm' ) {
            my ($s) = $desc =~ m/\(suffix (.)\)/;
            $s    ||= 's';
            $desc =~ s/\s+\(suffix .\)//;
            $desc .= ".  Optional suffix s=seconds, m=minutes, h=hours, "
                   . "d=days; if no suffix, $s is used.";
         }
         $desc = join("\n$rpad", grep { $_ } $desc =~ m/(.{0,$rcol})(?:\s+|$)/g);
         $desc =~ s/ +$//mg;
         if ( $short ) {
            $usage .= sprintf("  --%-${maxs}s -%s  %s\n", $long, $short, $desc);
         }
         else {
            $usage .= sprintf("  --%-${lcol}s  %s\n", $long, $desc);
         }
      }
   }

   $usage .= "\nOption types: s=string, i=integer, f=float, h/H/a/A=comma-separated list, d=DSN, z=size, m=time\n";

   if ( (my @rules = @{$self->{rules}}) ) {
      $usage .= "\nRules:\n\n";
      $usage .= join("\n", map { "  $_" } @rules) . "\n";
   }
   if ( $self->{DSNParser} ) {
      $usage .= "\n" . $self->{DSNParser}->usage();
   }
   $usage .= "\nOptions and values after processing arguments:\n\n";
   foreach my $opt ( sort { $a->{long} cmp $b->{long} } @opts ) {
      my $val   = $opt->{value};
      my $type  = $opt->{type} || '';
      my $bool  = $opt->{spec} =~ m/^[\w-]+(?:\|[\w-])?!?$/;
      $val      = $bool              ? ( $val ? 'TRUE' : 'FALSE' )
                : !defined $val      ? '(No value)'
                : $type eq 'd'       ? $self->{DSNParser}->as_string($val)
                : $type =~ m/H|h/    ? join(',', sort keys %$val)
                : $type =~ m/A|a/    ? join(',', @$val)
                :                    $val;
      $usage .= sprintf("  --%-${lcol}s  %s\n", $opt->{long}, $val);
   }
   return $usage;
}

sub prompt_noecho {
   shift @_ if ref $_[0] eq __PACKAGE__;
   my ( $prompt ) = @_;
   local $OUTPUT_AUTOFLUSH = 1;
   print $prompt
      or die "Cannot print: $OS_ERROR";
   my $response;
   eval {
      require Term::ReadKey;
      Term::ReadKey::ReadMode('noecho');
      chomp($response = <STDIN>);
      Term::ReadKey::ReadMode('normal');
      print "\n"
         or die "Cannot print: $OS_ERROR";
   };
   if ( $EVAL_ERROR ) {
      die "Cannot read response; is Term::ReadKey installed? $EVAL_ERROR";
   }
   return $response;
}

if ( MKDEBUG ) {
   print '# ', $^X, ' ', $], "\n";
   my $uname = `uname -a`;
   if ( $uname ) {
      $uname =~ s/\s+/ /g;
      print "# $uname\n";
   }
   printf("# %s  Ver %s Distrib %s Changeset %s line %d\n",
      $PROGRAM_NAME, ($main::VERSION || ''), ($main::DISTRIB || ''),
      ($main::SVN_REV || ''), __LINE__);
   print('# Arguments: ',
      join(' ', map { my $a = "_[$_]_"; $a =~ s/\n/\n# /g; $a; } @ARGV), "\n");
}

sub _read_config_file {
   my ( $self, $filename ) = @_;
   open my $fh, "<", $filename or die "Cannot open $filename: $OS_ERROR\n";
   my @args;
   my $prefix = '--';
   my $parse  = 1;

   LINE:
   while ( my $line = <$fh> ) {
      chomp $line;
      next LINE if $line =~ m/^\s*(?:\#|\;|$)/;
      $line =~ s/\s+#.*$//g;
      $line =~ s/^\s+|\s+$//g;
      if ( $line eq '--' ) {
         $prefix = '';
         $parse  = 0;
         next LINE;
      }
      if ( $parse
         && (my($opt, $arg) = $line =~ m/^\s*([^=\s]+?)(?:\s*=\s*(.*?)\s*)?$/)
      ) {
         push @args, grep { defined $_ } ("$prefix$opt", $arg);
      }
      elsif ( $line =~ m/./ ) {
         push @args, $line;
      }
      else {
         die "Syntax error in file $filename at line $INPUT_LINE_NUMBER";
      }
   }
   close $fh;
   return @args;
}

sub read_para_after {
   my ( $self, $file, $regex ) = @_;
   open my $fh, "<", $file or die "Can't open $file: $OS_ERROR";
   local $INPUT_RECORD_SEPARATOR = '';
   my $para;
   while ( $para = <$fh> ) {
      next unless $para =~ m/^=pod$/m;
      last;
   }
   while ( $para = <$fh> ) {
      next unless $para =~ m/$regex/;
      last;
   }
   $para = <$fh>;
   chomp($para);
   close $fh or die "Can't close $file: $OS_ERROR";
   return $para;
}

sub clone {
   my ( $self ) = @_;

   my %clone = map {
      my $hashref  = $self->{$_};
      my $val_copy = {};
      foreach my $key ( keys %$hashref ) {
         my $ref = ref $hashref->{$key};
         $val_copy->{$key} = !$ref           ? $hashref->{$key}
                           : $ref eq 'HASH'  ? { %{$hashref->{$key}} }
                           : $ref eq 'ARRAY' ? [ @{$hashref->{$key}} ]
                           : $hashref->{$key};
      }
      $_ => $val_copy;
   } qw(opts short_opts defaults);

   foreach my $scalar ( qw(got_opts) ) {
      $clone{$scalar} = $self->{$scalar};
   }

   return bless \%clone;     
}

sub _parse_size {
   my ( $self, $opt, $val ) = @_;

   if ( lc($val || '') eq 'null' ) {
      MKDEBUG && _d('NULL size for', $opt->{long});
      $opt->{value} = 'null';
      return;
   }

   my %factor_for = (k => 1_024, M => 1_048_576, G => 1_073_741_824);
   my ($pre, $num, $factor) = $val =~ m/^([+-])?(\d+)([kMG])?$/;
   if ( defined $num ) {
      if ( $factor ) {
         $num *= $factor_for{$factor};
         MKDEBUG && _d('Setting option', $opt->{y},
            'to num', $num, '* factor', $factor);
      }
      $opt->{value} = ($pre || '') . $num;
   }
   else {
      $self->save_error("Invalid size for --$opt->{long}");
   }
   return;
}

sub _parse_attribs {
   my ( $self, $option, $attribs ) = @_;
   my $types = $self->{types};
   return $option
      . ($attribs->{'short form'} ? '|' . $attribs->{'short form'}   : '' )
      . ($attribs->{'negatable'}  ? '!'                              : '' )
      . ($attribs->{'cumulative'} ? '+'                              : '' )
      . ($attribs->{'type'}       ? '=' . $types->{$attribs->{type}} : '' );
}

sub _parse_synopsis {
   my ( $self, $file ) = @_;
   $file ||= $self->{file} || __FILE__;
   MKDEBUG && _d("Parsing SYNOPSIS in", $file);

   local $INPUT_RECORD_SEPARATOR = '';  # read paragraphs
   open my $fh, "<", $file or die "Cannot open $file: $OS_ERROR";
   my $para;
   1 while defined($para = <$fh>) && $para !~ m/^=head1 SYNOPSIS/;
   die "$file does not contain a SYNOPSIS section" unless $para;
   my @synop;
   for ( 1..2 ) {  # 1 for the usage, 2 for the description
      my $para = <$fh>;
      push @synop, $para;
   }
   close $fh;
   MKDEBUG && _d("Raw SYNOPSIS text:", @synop);
   my ($usage, $desc) = @synop;
   die "The SYNOPSIS section in $file is not formatted properly"
      unless $usage && $desc;

   $usage =~ s/^\s*Usage:\s+(.+)/$1/;
   chomp $usage;

   $desc =~ s/\n/ /g;
   $desc =~ s/\s{2,}/ /g;
   $desc =~ s/\. ([A-Z][a-z])/.  $1/g;
   $desc =~ s/\s+$//;

   return (
      description => $desc,
      usage       => $usage,
   );
};

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End OptionParser package
# ###########################################################################

# ###########################################################################
# Transformers package 7226
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Transformers.pm
#   trunk/common/t/Transformers.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package Transformers;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Time::Local qw(timegm timelocal);
use Digest::MD5 qw(md5_hex);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

require Exporter;
our @ISA         = qw(Exporter);
our %EXPORT_TAGS = ();
our @EXPORT      = ();
our @EXPORT_OK   = qw(
   micro_t
   percentage_of
   secs_to_time
   time_to_secs
   shorten
   ts
   parse_timestamp
   unix_timestamp
   any_unix_timestamp
   make_checksum
   crc32
);

our $mysql_ts  = qr/(\d\d)(\d\d)(\d\d) +(\d+):(\d+):(\d+)(\.\d+)?/;
our $proper_ts = qr/(\d\d\d\d)-(\d\d)-(\d\d)[T ](\d\d):(\d\d):(\d\d)(\.\d+)?/;
our $n_ts      = qr/(\d{1,5})([shmd]?)/; # Limit \d{1,5} because \d{6} looks

sub micro_t {
   my ( $t, %args ) = @_;
   my $p_ms = defined $args{p_ms} ? $args{p_ms} : 0;  # precision for ms vals
   my $p_s  = defined $args{p_s}  ? $args{p_s}  : 0;  # precision for s vals
   my $f;

   $t = 0 if $t < 0;

   $t = sprintf('%.17f', $t) if $t =~ /e/;

   $t =~ s/\.(\d{1,6})\d*/\.$1/;

   if ($t > 0 && $t <= 0.000999) {
      $f = ($t * 1000000) . 'us';
   }
   elsif ($t >= 0.001000 && $t <= 0.999999) {
      $f = sprintf("%.${p_ms}f", $t * 1000);
      $f = ($f * 1) . 'ms'; # * 1 to remove insignificant zeros
   }
   elsif ($t >= 1) {
      $f = sprintf("%.${p_s}f", $t);
      $f = ($f * 1) . 's'; # * 1 to remove insignificant zeros
   }
   else {
      $f = 0;  # $t should = 0 at this point
   }

   return $f;
}

sub percentage_of {
   my ( $is, $of, %args ) = @_;
   my $p   = $args{p} || 0; # float precision
   my $fmt = $p ? "%.${p}f" : "%d";
   return sprintf $fmt, ($is * 100) / ($of ||= 1);
}

sub secs_to_time {
   my ( $secs, $fmt ) = @_;
   $secs ||= 0;
   return '00:00' unless $secs;

   $fmt ||= $secs >= 86_400 ? 'd'
          : $secs >= 3_600  ? 'h'
          :                   'm';

   return
      $fmt eq 'd' ? sprintf(
         "%d+%02d:%02d:%02d",
         int($secs / 86_400),
         int(($secs % 86_400) / 3_600),
         int(($secs % 3_600) / 60),
         $secs % 60)
      : $fmt eq 'h' ? sprintf(
         "%02d:%02d:%02d",
         int(($secs % 86_400) / 3_600),
         int(($secs % 3_600) / 60),
         $secs % 60)
      : sprintf(
         "%02d:%02d",
         int(($secs % 3_600) / 60),
         $secs % 60);
}

sub time_to_secs {
   my ( $val, $default_suffix ) = @_;
   die "I need a val argument" unless defined $val;
   my $t = 0;
   my ( $prefix, $num, $suffix ) = $val =~ m/([+-]?)(\d+)([a-z])?$/;
   $suffix = $suffix || $default_suffix || 's';
   if ( $suffix =~ m/[smhd]/ ) {
      $t = $suffix eq 's' ? $num * 1        # Seconds
         : $suffix eq 'm' ? $num * 60       # Minutes
         : $suffix eq 'h' ? $num * 3600     # Hours
         :                  $num * 86400;   # Days

      $t *= -1 if $prefix && $prefix eq '-';
   }
   else {
      die "Invalid suffix for $val: $suffix";
   }
   return $t;
}

sub shorten {
   my ( $num, %args ) = @_;
   my $p = defined $args{p} ? $args{p} : 2;     # float precision
   my $d = defined $args{d} ? $args{d} : 1_024; # divisor
   my $n = 0;
   my @units = ('', qw(k M G T P E Z Y));
   while ( $num >= $d && $n < @units - 1 ) {
      $num /= $d;
      ++$n;
   }
   return sprintf(
      $num =~ m/\./ || $n
         ? "%.${p}f%s"
         : '%d',
      $num, $units[$n]);
}

sub ts {
   my ( $time, $gmt ) = @_;
   my ( $sec, $min, $hour, $mday, $mon, $year )
      = $gmt ? gmtime($time) : localtime($time);
   $mon  += 1;
   $year += 1900;
   my $val = sprintf("%d-%02d-%02dT%02d:%02d:%02d",
      $year, $mon, $mday, $hour, $min, $sec);
   if ( my ($us) = $time =~ m/(\.\d+)$/ ) {
      $us = sprintf("%.6f", $us);
      $us =~ s/^0\././;
      $val .= $us;
   }
   return $val;
}

sub parse_timestamp {
   my ( $val ) = @_;
   if ( my($y, $m, $d, $h, $i, $s, $f)
         = $val =~ m/^$mysql_ts$/ )
   {
      return sprintf "%d-%02d-%02d %02d:%02d:"
                     . (defined $f ? '%09.6f' : '%02d'),
                     $y + 2000, $m, $d, $h, $i, (defined $f ? $s + $f : $s);
   }
   return $val;
}

sub unix_timestamp {
   my ( $val, $gmt ) = @_;
   if ( my($y, $m, $d, $h, $i, $s, $us) = $val =~ m/^$proper_ts$/ ) {
      $val = $gmt
         ? timegm($s, $i, $h, $d, $m - 1, $y)
         : timelocal($s, $i, $h, $d, $m - 1, $y);
      if ( defined $us ) {
         $us = sprintf('%.6f', $us);
         $us =~ s/^0\././;
         $val .= $us;
      }
   }
   return $val;
}

sub any_unix_timestamp {
   my ( $val, $callback ) = @_;

   if ( my ($n, $suffix) = $val =~ m/^$n_ts$/ ) {
      $n = $suffix eq 's' ? $n            # Seconds
         : $suffix eq 'm' ? $n * 60       # Minutes
         : $suffix eq 'h' ? $n * 3600     # Hours
         : $suffix eq 'd' ? $n * 86400    # Days
         :                  $n;           # default: Seconds
      MKDEBUG && _d('ts is now - N[shmd]:', $n);
      return time - $n;
   }
   elsif ( $val =~ m/^\d{9,}/ ) {
      MKDEBUG && _d('ts is already a unix timestamp');
      return $val;
   }
   elsif ( my ($ymd, $hms) = $val =~ m/^(\d{6})(?:\s+(\d+:\d+:\d+))?/ ) {
      MKDEBUG && _d('ts is MySQL slow log timestamp');
      $val .= ' 00:00:00' unless $hms;
      return unix_timestamp(parse_timestamp($val));
   }
   elsif ( ($ymd, $hms) = $val =~ m/^(\d{4}-\d\d-\d\d)(?:[T ](\d+:\d+:\d+))?/) {
      MKDEBUG && _d('ts is properly formatted timestamp');
      $val .= ' 00:00:00' unless $hms;
      return unix_timestamp($val);
   }
   else {
      MKDEBUG && _d('ts is MySQL expression');
      return $callback->($val) if $callback && ref $callback eq 'CODE';
   }

   MKDEBUG && _d('Unknown ts type:', $val);
   return;
}

sub make_checksum {
   my ( $val ) = @_;
   my $checksum = uc substr(md5_hex($val), -16);
   MKDEBUG && _d($checksum, 'checksum for', $val);
   return $checksum;
}

sub crc32 {
   my ( $string ) = @_;
   return unless $string;
   my $poly = 0xEDB88320;
   my $crc  = 0xFFFFFFFF;
   foreach my $char ( split(//, $string) ) {
      my $comp = ($crc ^ ord($char)) & 0xFF;
      for ( 1 .. 8 ) {
         $comp = $comp & 1 ? $poly ^ ($comp >> 1) : $comp >> 1;
      }
      $crc = (($crc >> 8) & 0x00FFFFFF) ^ $comp;
   }
   return $crc ^ 0xFFFFFFFF;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End Transformers package
# ###########################################################################

# ###########################################################################
# QueryRewriter package 7473
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/QueryRewriter.pm
#   trunk/common/t/QueryRewriter.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
use strict;
use warnings FATAL => 'all';

package QueryRewriter;

use English qw(-no_match_vars);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

our $verbs   = qr{^SHOW|^FLUSH|^COMMIT|^ROLLBACK|^BEGIN|SELECT|INSERT
                  |UPDATE|DELETE|REPLACE|^SET|UNION|^START|^LOCK}xi;
my $quote_re = qr/"(?:(?!(?<!\\)").)*"|'(?:(?!(?<!\\)').)*'/; # Costly!
my $bal;
$bal         = qr/
                  \(
                  (?:
                     (?> [^()]+ )    # Non-parens without backtracking
                     |
                     (??{ $bal })    # Group with matching parens
                  )*
                  \)
                 /x;

my $olc_re = qr/(?:--|#)[^'"\r\n]*(?=[\r\n]|\Z)/;  # One-line comments
my $mlc_re = qr#/\*[^!].*?\*/#sm;                  # But not /*!version */
my $vlc_re = qr#/\*.*?[0-9+].*?\*/#sm;             # For SHOW + /*!version */
my $vlc_rf = qr#^(SHOW).*?/\*![0-9+].*?\*/#sm;     # Variation for SHOW


sub new {
   my ( $class, %args ) = @_;
   my $self = { %args };
   return bless $self, $class;
}

sub strip_comments {
   my ( $self, $query ) = @_;
   return unless $query;
   $query =~ s/$olc_re//go;
   $query =~ s/$mlc_re//go;
   if ( $query =~ m/$vlc_rf/i ) { # contains show + version
      $query =~ s/$vlc_re//go;
   }
   return $query;
}

sub shorten {
   my ( $self, $query, $length ) = @_;
   $query =~ s{
      \A(
         (?:INSERT|REPLACE)
         (?:\s+LOW_PRIORITY|DELAYED|HIGH_PRIORITY|IGNORE)?
         (?:\s\w+)*\s+\S+\s+VALUES\s*\(.*?\)
      )
      \s*,\s*\(.*?(ON\s+DUPLICATE|\Z)}
      {$1 /*... omitted ...*/$2}xsi;

   return $query unless $query =~ m/IN\s*\(\s*(?!select)/i;

   my $last_length  = 0;
   my $query_length = length($query);
   while (
      $length          > 0
      && $query_length > $length
      && $query_length < ( $last_length || $query_length + 1 )
   ) {
      $last_length = $query_length;
      $query =~ s{
         (\bIN\s*\()    # The opening of an IN list
         ([^\)]+)       # Contents of the list, assuming no item contains paren
         (?=\))           # Close of the list
      }
      {
         $1 . __shorten($2)
      }gexsi;
   }

   return $query;
}

sub __shorten {
   my ( $snippet ) = @_;
   my @vals = split(/,/, $snippet);
   return $snippet unless @vals > 20;
   my @keep = splice(@vals, 0, 20);  # Remove and save the first 20 items
   return
      join(',', @keep)
      . "/*... omitted "
      . scalar(@vals)
      . " items ...*/";
}

sub fingerprint {
   my ( $self, $query ) = @_;

   $query =~ m#\ASELECT /\*!40001 SQL_NO_CACHE \*/ \* FROM `# # mysqldump query
      && return 'mysqldump';
   $query =~ m#/\*\w+\.\w+:[0-9]/[0-9]\*/#     # mk-table-checksum, etc query
      && return 'maatkit';
   $query =~ m/\Aadministrator command: /
      && return $query;
   $query =~ m/\A\s*(call\s+\S+)\(/i
      && return lc($1); # Warning! $1 used, be careful.
   if ( my ($beginning) = $query =~ m/\A((?:INSERT|REPLACE)(?: IGNORE)?\s+INTO.+?VALUES\s*\(.*?\))\s*,\s*\(/is ) {
      $query = $beginning; # Shorten multi-value INSERT statements ASAP
   }
  
   $query =~ s/$olc_re//go;
   $query =~ s/$mlc_re//go;
   $query =~ s/\Ause \S+\Z/use ?/i       # Abstract the DB in USE
      && return $query;

   $query =~ s/\\["']//g;                # quoted strings
   $query =~ s/".*?"/?/sg;               # quoted strings
   $query =~ s/'.*?'/?/sg;               # quoted strings
   $query =~ s/[0-9+-][0-9a-f.xb+-]*/?/g;# Anything vaguely resembling numbers
   $query =~ s/[xb.+-]\?/?/g;            # Clean up leftovers
   $query =~ s/\A\s+//;                  # Chop off leading whitespace
   chomp $query;                         # Kill trailing whitespace
   $query =~ tr[ \n\t\r\f][ ]s;          # Collapse whitespace
   $query = lc $query;
   $query =~ s/\bnull\b/?/g;             # Get rid of NULLs
   $query =~ s{                          # Collapse IN and VALUES lists
               \b(in|values?)(?:[\s,]*\([\s?,]*\))+
              }
              {$1(?+)}gx;
   $query =~ s{                          # Collapse UNION
               \b(select\s.*?)(?:(\sunion(?:\sall)?)\s\1)+
              }
              {$1 /*repeat$2*/}xg;
   $query =~ s/\blimit \?(?:, ?\?| offset \?)?/limit ?/; # LIMIT

   if ( $query =~ m/\bORDER BY /gi ) {  # Find, anchor on ORDER BY clause
      1 while $query =~ s/\G(.+?)\s+ASC/$1/gi && pos $query;
   }

   return $query;
}

sub distill_verbs {
   my ( $self, $query ) = @_;

   $query =~ m/\A\s*call\s+(\S+)\(/i && return "CALL $1";
   $query =~ m/\A\s*use\s+/          && return "USE";
   $query =~ m/\A\s*UNLOCK TABLES/i  && return "UNLOCK";
   $query =~ m/\A\s*xa\s+(\S+)/i     && return "XA_$1";

   if ( $query =~ m/\Aadministrator command:/ ) {
      $query =~ s/administrator command:/ADMIN/;
      $query = uc $query;
      return $query;
   }

   $query = $self->strip_comments($query);

   if ( $query =~ m/\A\s*SHOW\s+/i ) {
      MKDEBUG && _d($query);

      $query = uc $query;
      $query =~ s/\s+(?:GLOBAL|SESSION|FULL|STORAGE|ENGINE)\b/ /g;
      $query =~ s/\s+COUNT[^)]+\)//g;

      $query =~ s/\s+(?:FOR|FROM|LIKE|WHERE|LIMIT|IN)\b.+//ms;

      $query =~ s/\A(SHOW(?:\s+\S+){1,2}).*\Z/$1/s;
      $query =~ s/\s+/ /g;
      MKDEBUG && _d($query);
      return $query;
   }

   eval $QueryParser::data_def_stmts;
   eval $QueryParser::tbl_ident;
   my ( $dds ) = $query =~ /^\s*($QueryParser::data_def_stmts)\b/i;
   if ( $dds) {
      my ( $obj ) = $query =~ m/$dds.+(DATABASE|TABLE)\b/i;
      $obj = uc $obj if $obj;
      MKDEBUG && _d('Data def statment:', $dds, 'obj:', $obj);
      my ($db_or_tbl)
         = $query =~ m/(?:TABLE|DATABASE)\s+($QueryParser::tbl_ident)(\s+.*)?/i;
      MKDEBUG && _d('Matches db or table:', $db_or_tbl);
      return uc($dds . ($obj ? " $obj" : '')), $db_or_tbl;
   }

   my @verbs = $query =~ m/\b($verbs)\b/gio;
   @verbs    = do {
      my $last = '';
      grep { my $pass = $_ ne $last; $last = $_; $pass } map { uc } @verbs;
   };

   if ( ($verbs[0] || '') eq 'SELECT' && @verbs > 1 ) {
      MKDEBUG && _d("False-positive verbs after SELECT:", @verbs[1..$#verbs]);
      my $union = grep { $_ eq 'UNION' } @verbs;
      @verbs    = $union ? qw(SELECT UNION) : qw(SELECT);
   }

   my $verb_str = join(q{ }, @verbs);
   return $verb_str;
}

sub __distill_tables {
   my ( $self, $query, $table, %args ) = @_;
   my $qp = $args{QueryParser} || $self->{QueryParser};
   die "I need a QueryParser argument" unless $qp;

   my @tables = map {
      $_ =~ s/`//g;
      $_ =~ s/(_?)[0-9]+/$1?/g;
      $_;
   } grep { defined $_ } $qp->get_tables($query);

   push @tables, $table if $table;

   @tables = do {
      my $last = '';
      grep { my $pass = $_ ne $last; $last = $_; $pass } @tables;
   };

   return @tables;
}

sub distill {
   my ( $self, $query, %args ) = @_;

   if ( $args{generic} ) {
      my ($cmd, $arg) = $query =~ m/^(\S+)\s+(\S+)/;
      return '' unless $cmd;
      $query = (uc $cmd) . ($arg ? " $arg" : '');
   }
   else {
      my ($verbs, $table)  = $self->distill_verbs($query, %args);

      if ( $verbs && $verbs =~ m/^SHOW/ ) {
         my %alias_for = qw(
            SCHEMA   DATABASE
            KEYS     INDEX
            INDEXES  INDEX
         );
         map { $verbs =~ s/$_/$alias_for{$_}/ } keys %alias_for;
         $query = $verbs;
      }
      else {
         my @tables = $self->__distill_tables($query, $table, %args);
         $query     = join(q{ }, $verbs, @tables); 
      } 
   }

   if ( $args{trf} ) {
      $query = $args{trf}->($query, %args);
   }

   return $query;
}

sub convert_to_select {
   my ( $self, $query ) = @_;
   return unless $query;

   return if $query =~ m/=\s*\(\s*SELECT /i;

   $query =~ s{
                 \A.*?
                 update(?:\s+(?:low_priority|ignore))?\s+(.*?)
                 \s+set\b(.*?)
                 (?:\s*where\b(.*?))?
                 (limit\s*[0-9]+(?:\s*,\s*[0-9]+)?)?
                 \Z
              }
              {__update_to_select($1, $2, $3, $4)}exsi
      || $query =~ s{
                    \A.*?
                    (?:insert(?:\s+ignore)?|replace)\s+
                    .*?\binto\b(.*?)\(([^\)]+)\)\s*
                    values?\s*(\(.*?\))\s*
                    (?:\blimit\b|on\s+duplicate\s+key.*)?\s*
                    \Z
                 }
                 {__insert_to_select($1, $2, $3)}exsi
      || $query =~ s{
                    \A.*?
                    (?:insert(?:\s+ignore)?|replace)\s+
                    (?:.*?\binto)\b(.*?)\s*
                    set\s+(.*?)\s*
                    (?:\blimit\b|on\s+duplicate\s+key.*)?\s*
                    \Z
                 }
                 {__insert_to_select_with_set($1, $2)}exsi
      || $query =~ s{
                    \A.*?
                    delete\s+(.*?)
                    \bfrom\b(.*)
                    \Z
                 }
                 {__delete_to_select($1, $2)}exsi;
   $query =~ s/\s*on\s+duplicate\s+key\s+update.*\Z//si;
   $query =~ s/\A.*?(?=\bSELECT\s*\b)//ism;
   return $query;
}

sub convert_select_list {
   my ( $self, $query ) = @_;
   $query =~ s{
               \A\s*select(.*?)\bfrom\b
              }
              {$1 =~ m/\*/ ? "select 1 from" : "select isnull(coalesce($1)) from"}exi;
   return $query;
}

sub __delete_to_select {
   my ( $delete, $join ) = @_;
   if ( $join =~ m/\bjoin\b/ ) {
      return "select 1 from $join";
   }
   return "select * from $join";
}

sub __insert_to_select {
   my ( $tbl, $cols, $vals ) = @_;
   MKDEBUG && _d('Args:', @_);
   my @cols = split(/,/, $cols);
   MKDEBUG && _d('Cols:', @cols);
   $vals =~ s/^\(|\)$//g; # Strip leading/trailing parens
   my @vals = $vals =~ m/($quote_re|[^,]*${bal}[^,]*|[^,]+)/g;
   MKDEBUG && _d('Vals:', @vals);
   if ( @cols == @vals ) {
      return "select * from $tbl where "
         . join(' and ', map { "$cols[$_]=$vals[$_]" } (0..$#cols));
   }
   else {
      return "select * from $tbl limit 1";
   }
}

sub __insert_to_select_with_set {
   my ( $from, $set ) = @_;
   $set =~ s/,/ and /g;
   return "select * from $from where $set ";
}

sub __update_to_select {
   my ( $from, $set, $where, $limit ) = @_;
   return "select $set from $from "
      . ( $where ? "where $where" : '' )
      . ( $limit ? " $limit "      : '' );
}

sub wrap_in_derived {
   my ( $self, $query ) = @_;
   return unless $query;
   return $query =~ m/\A\s*select/i
      ? "select 1 from ($query) as x limit 1"
      : $query;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End QueryRewriter package
# ###########################################################################

# ###########################################################################
# Processlist package 7289
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Processlist.pm
#   trunk/common/t/Processlist.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package Processlist;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Time::HiRes qw(time usleep);
use List::Util qw(max);
use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;
use constant {
   ID      => 0,  
   USER    => 1,  
   HOST    => 2,
   DB      => 3,
   COMMAND => 4,
   TIME    => 5,
   STATE   => 6,
   INFO    => 7,
   START   => 8,  # Calculated start time of statement ($start - TIME)
   ETIME   => 9,  # Exec time of SHOW PROCESSLIST (margin of error in START)
   FSEEN   => 10, # First time ever seen
   PROFILE => 11, # Profile of individual STATE times
};


sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(MasterSlave) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $self = {
      %args,
      polls       => 0,
      last_poll   => 0,
      active_cxn  => {},  # keyed off ID
      event_cache => [],
   };
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(code);
   foreach my $arg ( @required_args ) {
     die "I need a $arg argument" unless $args{$arg};
   }
   my ($code) = @args{@required_args};

   if ( @{$self->{event_cache}} ) {
      MKDEBUG && _d("Returning cached event");
      return shift @{$self->{event_cache}};
   }

   if ( $self->{interval} && $self->{polls} ) {
      MKDEBUG && _d("Sleeping between polls");
      usleep($self->{interval});
   }

   MKDEBUG && _d("Polling PROCESSLIST");
   my ($time, $etime) = @args{qw(time etime)};
   my $start          = $etime ? 0 : time;  # don't need start if etime given
   my $rows           = $code->();
   if ( !$rows ) {
      warn "Processlist callback did not return an arrayref";
      return;
   }
   $time  = time           unless $time;
   $etime = $time - $start unless $etime;
   $self->{polls}++;
   MKDEBUG && _d('Rows:', ($rows ? scalar @$rows : 0), 'in', $etime, 'seconds');

   my $active_cxn = $self->{active_cxn};
   my $curr_cxn   = {};
   my @new_cxn    = ();

   CURRENTLY_ACTIVE_CXN:
   foreach my $curr ( @$rows ) {

      $curr_cxn->{$curr->[ID]} = $curr;

      my $query_start = $time - ($curr->[TIME] || 0);

      if ( $active_cxn->{$curr->[ID]} ) {
         MKDEBUG && _d('Checking existing cxn', $curr->[ID]);
         my $prev      = $active_cxn->{$curr->[ID]}; # previous state of cxn
         my $new_query = 0;
         my $fudge     = ($curr->[TIME] || 0) =~ m/\D/ ? 0.001 : 1; # micro-t?

         if ( $prev->[INFO] ) {
            if ( !$curr->[INFO] || $prev->[INFO] ne $curr->[INFO] ) {
               MKDEBUG && _d('Info is different; new query');
               $new_query = 1;
            }
            elsif ( defined $curr->[TIME] && $curr->[TIME] < $prev->[TIME] ) {
               MKDEBUG && _d('Time is less than previous; new query');
               $new_query = 1;
            }
            elsif ( $curr->[INFO] && defined $curr->[TIME]
                    && $query_start - $etime - $prev->[START] > $fudge ) {
               MKDEBUG && _d('Query restarted; new query',
                  $query_start, $etime, $prev->[START], $fudge);
               $new_query = 1;
            }

            if ( $new_query ) {
               $self->_update_profile($prev, $curr, $time);
               push @{$self->{event_cache}},
                  $self->make_event($prev, $time);
            }
         }

         if ( $curr->[INFO] ) {
            if ( $prev->[INFO] && !$new_query ) {
               MKDEBUG && _d("Query on cxn", $curr->[ID], "hasn't changed");
               $self->_update_profile($prev, $curr, $time);
            }
            else {
               MKDEBUG && _d('Saving new query, state', $curr->[STATE]);
               push @new_cxn, [
                  @$curr,                   # proc info
                  int($query_start),        # START
                  $etime,                   # ETIME
                  $time,                    # FSEEN
                  { $curr->[STATE] => 0 },  # PROFILE
               ];
            }
         }
      } 
      else {
         MKDEBUG && _d('New cxn', $curr->[ID]);
         if ( $curr->[INFO] && defined $curr->[TIME] ) {
            MKDEBUG && _d('Saving query of new cxn, state', $curr->[STATE]);
            push @new_cxn, [
               @$curr,                   # proc info
               int($query_start),        # START
               $etime,                   # ETIME
               $time,                    # FSEEN
               { $curr->[STATE] => 0 },  # PROFILE
            ];
         }
      }
   }  # CURRENTLY_ACTIVE_CXN

   PREVIOUSLY_ACTIVE_CXN:
   foreach my $prev ( values %$active_cxn ) {
      if ( !$curr_cxn->{$prev->[ID]} ) {
         MKDEBUG && _d('cxn', $prev->[ID], 'ended');
         push @{$self->{event_cache}},
            $self->make_event($prev, $time);
         delete $active_cxn->{$prev->[ID]};
      }
      elsif (   ($curr_cxn->{$prev->[ID]}->[COMMAND] || "") eq 'Sleep' 
             || !$curr_cxn->{$prev->[ID]}->[STATE]
             || !$curr_cxn->{$prev->[ID]}->[INFO] ) {
         MKDEBUG && _d('cxn', $prev->[ID], 'became idle');
         delete $active_cxn->{$prev->[ID]};
      }
   }

   map { $active_cxn->{$_->[ID]} = $_; } @new_cxn;

   $self->{last_poll} = $time;

   my $event = shift @{$self->{event_cache}};
   MKDEBUG && _d(scalar @{$self->{event_cache}}, "events in cache");
   return $event;
}

sub make_event {
   my ( $self, $row, $time ) = @_;

   my $observed_time = $time - $row->[FSEEN];
   my $Query_time    = max($row->[TIME], $observed_time);




   my $event = {
      id         => $row->[ID],
      db         => $row->[DB],
      user       => $row->[USER],
      host       => $row->[HOST],
      arg        => $row->[INFO],
      bytes      => length($row->[INFO]),
      ts         => Transformers::ts($row->[START] + $row->[TIME]), # Query END time
      Query_time => $Query_time,
      Lock_time  => $row->[PROFILE]->{Locked} || 0,
   };
   MKDEBUG && _d('Properties of event:', Dumper($event));
   return $event;
}

sub _get_active_cxn {
   my ( $self ) = @_;
   MKDEBUG && _d("Active cxn:", Dumper($self->{active_cxn}));
   return $self->{active_cxn};
}

sub _update_profile {
   my ( $self, $prev, $curr, $time ) = @_;
   return unless $prev && $curr;

   my $time_elapsed = $time - $self->{last_poll};


   if ( ($prev->[STATE] || "") eq ($curr->[STATE] || "") ) {
      MKDEBUG && _d("Query is still in", $curr->[STATE], "state");
      $prev->[PROFILE]->{$prev->[STATE] || ""} += $time_elapsed;
   }
   else {
      MKDEBUG && _d("Query changed from state", $prev->[STATE],
         "to", $curr->[STATE]);
      my $half_time = ($time_elapsed || 0) / 2;

      $prev->[PROFILE]->{$prev->[STATE] || ""} += $half_time;

      $prev->[STATE] = $curr->[STATE];
      $prev->[PROFILE]->{$curr->[STATE] || ""}  = $half_time;
   }

   return;
}

sub find {
   my ( $self, $proclist, %find_spec ) = @_;
   MKDEBUG && _d('find specs:', Dumper(\%find_spec));
   my $ms  = $self->{MasterSlave};

   my @matches;
   QUERY:
   foreach my $query ( @$proclist ) {
      MKDEBUG && _d('Checking query', Dumper($query));
      my $matched = 0;

      if (    !$find_spec{replication_threads}
           && $ms->is_replication_thread($query) ) {
         MKDEBUG && _d('Skipping replication thread');
         next QUERY;
      }

      if ( $find_spec{busy_time} && ($query->{Command} || '') eq 'Query' ) {
         if ( $query->{Time} < $find_spec{busy_time} ) {
            MKDEBUG && _d("Query isn't running long enough");
            next QUERY;
         }
         MKDEBUG && _d('Exceeds busy time');
         $matched++;
      }

      if ( $find_spec{idle_time} && ($query->{Command} || '') eq 'Sleep' ) {
         if ( $query->{Time} < $find_spec{idle_time} ) {
            MKDEBUG && _d("Query isn't idle long enough");
            next QUERY;
         }
         MKDEBUG && _d('Exceeds idle time');
         $matched++;
      }
 
      PROPERTY:
      foreach my $property ( qw(Id User Host db State Command Info) ) {
         my $filter = "_find_match_$property";
         if ( defined $find_spec{ignore}->{$property}
              && $self->$filter($query, $find_spec{ignore}->{$property}) ) {
            MKDEBUG && _d('Query matches ignore', $property, 'spec');
            next QUERY;
         }
         if ( defined $find_spec{match}->{$property} ) {
            if ( !$self->$filter($query, $find_spec{match}->{$property}) ) {
               MKDEBUG && _d('Query does not match', $property, 'spec');
               next QUERY;
            }
            MKDEBUG && _d('Query matches', $property, 'spec');
            $matched++;
         }
      }
      if ( $matched || $find_spec{all} ) {
         MKDEBUG && _d("Query matched one or more specs, adding");
         push @matches, $query;
         next QUERY;
      }
      MKDEBUG && _d('Query does not match any specs, ignoring');
   } # QUERY

   return @matches;
}

sub _find_match_Id {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{Id} && $query->{Id} == $property;
}

sub _find_match_User {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{User}
      && $query->{User} =~ m/$property/;
}

sub _find_match_Host {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{Host}
      && $query->{Host} =~ m/$property/;
}

sub _find_match_db {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{db}
      && $query->{db} =~ m/$property/;
}

sub _find_match_State {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{State}
      && $query->{State} =~ m/$property/;
}

sub _find_match_Command {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{Command}
      && $query->{Command} =~ m/$property/;
}

sub _find_match_Info {
   my ( $self, $query, $property ) = @_;
   return defined $property && defined $query->{Info}
      && $query->{Info} =~ m/$property/;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End Processlist package
# ###########################################################################

# ###########################################################################
# TcpdumpParser package 7505
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/TcpdumpParser.pm
#   trunk/common/t/TcpdumpParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package TcpdumpParser;


use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Data::Dumper;
$Data::Dumper::Indent   = 1;
$Data::Dumper::Sortkeys = 1;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my $self = {};
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(next_event tell);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($next_event, $tell) = @args{@required_args};

   local $INPUT_RECORD_SEPARATOR = "\n20";

   my $pos_in_log = $tell->();
   while ( defined(my $raw_packet = $next_event->()) ) {
      next if $raw_packet =~ m/^$/;  # issue 564
      $pos_in_log -= 1 if $pos_in_log;

      $raw_packet =~ s/\n20\Z//;
      $raw_packet = "20$raw_packet" unless $raw_packet =~ m/\A20/;

      $raw_packet =~ s/0x0000:.+?(450.) /0x0000:  $1 /;

      my $packet = $self->_parse_packet($raw_packet);
      $packet->{pos_in_log} = $pos_in_log;
      $packet->{raw_packet} = $raw_packet;

      $args{stats}->{events_read}++ if $args{stats};

      return $packet;
   }

   $args{oktorun}->(0) if $args{oktorun};
   return;
}

sub _parse_packet {
   my ( $self, $packet ) = @_;
   die "I need a packet" unless $packet;

   my ( $ts, $source, $dest )  = $packet =~ m/\A(\S+ \S+).*? IP .*?(\S+) > (\S+):/;
   my ( $src_host, $src_port ) = $source =~ m/((?:\d+\.){3}\d+)\.(\w+)/;
   my ( $dst_host, $dst_port ) = $dest   =~ m/((?:\d+\.){3}\d+)\.(\w+)/;

   $src_port = $self->port_number($src_port);
   $dst_port = $self->port_number($dst_port);
   
   my $hex = qr/[0-9a-f]/;
   (my $data = join('', $packet =~ m/\s+0x$hex+:\s((?:\s$hex{2,4})+)/go)) =~ s/\s+//g; 

   my $ip_hlen = hex(substr($data, 1, 1)); # Num of 32-bit words in header.
   my $ip_plen = hex(substr($data, 4, 4)); # Num of BYTES in IPv4 datagram.
   my $complete = length($data) == 2 * $ip_plen ? 1 : 0;

   my $tcp_hlen = hex(substr($data, ($ip_hlen + 3) * 8, 1));

   my $seq = hex(substr($data, ($ip_hlen + 1) * 8, 8));
   my $ack = hex(substr($data, ($ip_hlen + 2) * 8, 8));

   my $flags = hex(substr($data, (($ip_hlen + 3) * 8) + 2, 2));

   $data = substr($data, ($ip_hlen + $tcp_hlen) * 8);

   my $pkt = {
      ts        => $ts,
      seq       => $seq,
      ack       => $ack,
      fin       => $flags & 0x01,
      syn       => $flags & 0x02,
      rst       => $flags & 0x04,
      src_host  => $src_host,
      src_port  => $src_port,
      dst_host  => $dst_host,
      dst_port  => $dst_port,
      complete  => $complete,
      ip_hlen   => $ip_hlen,
      tcp_hlen  => $tcp_hlen,
      dgram_len => $ip_plen,
      data_len  => $ip_plen - (($ip_hlen + $tcp_hlen) * 4),
      data      => $data ? substr($data, 0, 10).(length $data > 10 ? '...' : '')
                         : '',
   };
   MKDEBUG && _d('packet:', Dumper($pkt));
   $pkt->{data} = $data;
   return $pkt;
}

sub port_number {
   my ( $self, $port ) = @_;
   return unless $port;
   return $port eq 'memcached' ? 11211
        : $port eq 'http'      ? 80
        : $port eq 'mysql'     ? 3306
        :                        $port; 
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End TcpdumpParser package
# ###########################################################################

# ###########################################################################
# MySQLProtocolParser package 7522
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/MySQLProtocolParser.pm
#   trunk/common/t/MySQLProtocolParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package MySQLProtocolParser;


use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

eval {
   require IO::Uncompress::Inflate;
   IO::Uncompress::Inflate->import(qw(inflate $InflateError));
};

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

require Exporter;
our @ISA         = qw(Exporter);
our %EXPORT_TAGS = ();
our @EXPORT      = ();
our @EXPORT_OK   = qw(
   parse_error_packet
   parse_ok_packet
   parse_ok_prepared_statement_packet
   parse_server_handshake_packet
   parse_client_handshake_packet
   parse_com_packet
   parse_flags
);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;
use constant {
   COM_SLEEP               => '00',
   COM_QUIT                => '01',
   COM_INIT_DB             => '02',
   COM_QUERY               => '03',
   COM_FIELD_LIST          => '04',
   COM_CREATE_DB           => '05',
   COM_DROP_DB             => '06',
   COM_REFRESH             => '07',
   COM_SHUTDOWN            => '08',
   COM_STATISTICS          => '09',
   COM_PROCESS_INFO        => '0a',
   COM_CONNECT             => '0b',
   COM_PROCESS_KILL        => '0c',
   COM_DEBUG               => '0d',
   COM_PING                => '0e',
   COM_TIME                => '0f',
   COM_DELAYED_INSERT      => '10',
   COM_CHANGE_USER         => '11',
   COM_BINLOG_DUMP         => '12',
   COM_TABLE_DUMP          => '13',
   COM_CONNECT_OUT         => '14',
   COM_REGISTER_SLAVE      => '15',
   COM_STMT_PREPARE        => '16',
   COM_STMT_EXECUTE        => '17',
   COM_STMT_SEND_LONG_DATA => '18',
   COM_STMT_CLOSE          => '19',
   COM_STMT_RESET          => '1a',
   COM_SET_OPTION          => '1b',
   COM_STMT_FETCH          => '1c',
   SERVER_QUERY_NO_GOOD_INDEX_USED => 16,
   SERVER_QUERY_NO_INDEX_USED      => 32,
};

my %com_for = (
   '00' => 'COM_SLEEP',
   '01' => 'COM_QUIT',
   '02' => 'COM_INIT_DB',
   '03' => 'COM_QUERY',
   '04' => 'COM_FIELD_LIST',
   '05' => 'COM_CREATE_DB',
   '06' => 'COM_DROP_DB',
   '07' => 'COM_REFRESH',
   '08' => 'COM_SHUTDOWN',
   '09' => 'COM_STATISTICS',
   '0a' => 'COM_PROCESS_INFO',
   '0b' => 'COM_CONNECT',
   '0c' => 'COM_PROCESS_KILL',
   '0d' => 'COM_DEBUG',
   '0e' => 'COM_PING',
   '0f' => 'COM_TIME',
   '10' => 'COM_DELAYED_INSERT',
   '11' => 'COM_CHANGE_USER',
   '12' => 'COM_BINLOG_DUMP',
   '13' => 'COM_TABLE_DUMP',
   '14' => 'COM_CONNECT_OUT',
   '15' => 'COM_REGISTER_SLAVE',
   '16' => 'COM_STMT_PREPARE',
   '17' => 'COM_STMT_EXECUTE',
   '18' => 'COM_STMT_SEND_LONG_DATA',
   '19' => 'COM_STMT_CLOSE',
   '1a' => 'COM_STMT_RESET',
   '1b' => 'COM_SET_OPTION',
   '1c' => 'COM_STMT_FETCH',
);

my %flag_for = (
   'CLIENT_LONG_PASSWORD'     => 1,       # new more secure passwords 
   'CLIENT_FOUND_ROWS'        => 2,       # Found instead of affected rows 
   'CLIENT_LONG_FLAG'         => 4,       # Get all column flags 
   'CLIENT_CONNECT_WITH_DB'   => 8,       # One can specify db on connect 
   'CLIENT_NO_SCHEMA'         => 16,      # Don't allow database.table.column 
   'CLIENT_COMPRESS'          => 32,      # Can use compression protocol 
   'CLIENT_ODBC'              => 64,      # Odbc client 
   'CLIENT_LOCAL_FILES'       => 128,     # Can use LOAD DATA LOCAL 
   'CLIENT_IGNORE_SPACE'      => 256,     # Ignore spaces before '(' 
   'CLIENT_PROTOCOL_41'       => 512,     # New 4.1 protocol 
   'CLIENT_INTERACTIVE'       => 1024,    # This is an interactive client 
   'CLIENT_SSL'               => 2048,    # Switch to SSL after handshake 
   'CLIENT_IGNORE_SIGPIPE'    => 4096,    # IGNORE sigpipes 
   'CLIENT_TRANSACTIONS'      => 8192,    # Client knows about transactions 
   'CLIENT_RESERVED'          => 16384,   # Old flag for 4.1 protocol  
   'CLIENT_SECURE_CONNECTION' => 32768,   # New 4.1 authentication 
   'CLIENT_MULTI_STATEMENTS'  => 65536,   # Enable/disable multi-stmt support 
   'CLIENT_MULTI_RESULTS'     => 131072,  # Enable/disable multi-results 
);

use constant {
   MYSQL_TYPE_DECIMAL      => 0,
   MYSQL_TYPE_TINY         => 1,
   MYSQL_TYPE_SHORT        => 2,
   MYSQL_TYPE_LONG         => 3,
   MYSQL_TYPE_FLOAT        => 4,
   MYSQL_TYPE_DOUBLE       => 5,
   MYSQL_TYPE_NULL         => 6,
   MYSQL_TYPE_TIMESTAMP    => 7,
   MYSQL_TYPE_LONGLONG     => 8,
   MYSQL_TYPE_INT24        => 9,
   MYSQL_TYPE_DATE         => 10,
   MYSQL_TYPE_TIME         => 11,
   MYSQL_TYPE_DATETIME     => 12,
   MYSQL_TYPE_YEAR         => 13,
   MYSQL_TYPE_NEWDATE      => 14,
   MYSQL_TYPE_VARCHAR      => 15,
   MYSQL_TYPE_BIT          => 16,
   MYSQL_TYPE_NEWDECIMAL   => 246,
   MYSQL_TYPE_ENUM         => 247,
   MYSQL_TYPE_SET          => 248,
   MYSQL_TYPE_TINY_BLOB    => 249,
   MYSQL_TYPE_MEDIUM_BLOB  => 250,
   MYSQL_TYPE_LONG_BLOB    => 251,
   MYSQL_TYPE_BLOB         => 252,
   MYSQL_TYPE_VAR_STRING   => 253,
   MYSQL_TYPE_STRING       => 254,
   MYSQL_TYPE_GEOMETRY     => 255,
};

my %type_for = (
   0   => 'MYSQL_TYPE_DECIMAL',
   1   => 'MYSQL_TYPE_TINY',
   2   => 'MYSQL_TYPE_SHORT',
   3   => 'MYSQL_TYPE_LONG',
   4   => 'MYSQL_TYPE_FLOAT',
   5   => 'MYSQL_TYPE_DOUBLE',
   6   => 'MYSQL_TYPE_NULL',
   7   => 'MYSQL_TYPE_TIMESTAMP',
   8   => 'MYSQL_TYPE_LONGLONG',
   9   => 'MYSQL_TYPE_INT24',
   10  => 'MYSQL_TYPE_DATE',
   11  => 'MYSQL_TYPE_TIME',
   12  => 'MYSQL_TYPE_DATETIME',
   13  => 'MYSQL_TYPE_YEAR',
   14  => 'MYSQL_TYPE_NEWDATE',
   15  => 'MYSQL_TYPE_VARCHAR',
   16  => 'MYSQL_TYPE_BIT',
   246 => 'MYSQL_TYPE_NEWDECIMAL',
   247 => 'MYSQL_TYPE_ENUM',
   248 => 'MYSQL_TYPE_SET',
   249 => 'MYSQL_TYPE_TINY_BLOB',
   250 => 'MYSQL_TYPE_MEDIUM_BLOB',
   251 => 'MYSQL_TYPE_LONG_BLOB',
   252 => 'MYSQL_TYPE_BLOB',
   253 => 'MYSQL_TYPE_VAR_STRING',
   254 => 'MYSQL_TYPE_STRING',
   255 => 'MYSQL_TYPE_GEOMETRY',
);

my %unpack_type = (
   MYSQL_TYPE_NULL       => sub { return 'NULL', 0; },
   MYSQL_TYPE_TINY       => sub { return to_num(@_, 1), 1; },
   MySQL_TYPE_SHORT      => sub { return to_num(@_, 2), 2; },
   MYSQL_TYPE_LONG       => sub { return to_num(@_, 4), 4; },
   MYSQL_TYPE_LONGLONG   => sub { return to_num(@_, 8), 8; },
   MYSQL_TYPE_DOUBLE     => sub { return to_double(@_), 8; },
   MYSQL_TYPE_VARCHAR    => \&unpack_string,
   MYSQL_TYPE_VAR_STRING => \&unpack_string,
   MYSQL_TYPE_STRING     => \&unpack_string,
);

sub new {
   my ( $class, %args ) = @_;

   my $self = {
      server         => $args{server},
      port           => $args{port} || '3306',
      version        => '41',    # MySQL proto version; not used yet
      sessions       => {},
      o              => $args{o},
      fake_thread_id => 2**32,   # see _make_event()
   };
   MKDEBUG && $self->{server} && _d('Watching only server', $self->{server});
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(event);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $packet = @args{@required_args};

   my $src_host = "$packet->{src_host}:$packet->{src_port}";
   my $dst_host = "$packet->{dst_host}:$packet->{dst_port}";

   if ( my $server = $self->{server} ) {  # Watch only the given server.
      $server .= ":$self->{port}";
      if ( $src_host ne $server && $dst_host ne $server ) {
         MKDEBUG && _d('Packet is not to or from', $server);
         return;
      }
   }

   my $packet_from;
   my $client;
   if ( $src_host =~ m/:$self->{port}$/ ) {
      $packet_from = 'server';
      $client      = $dst_host;
   }
   elsif ( $dst_host =~ m/:$self->{port}$/ ) {
      $packet_from = 'client';
      $client      = $src_host;
   }
   else {
      MKDEBUG && _d('Packet is not to or from a MySQL server');
      return;
   }
   MKDEBUG && _d('Client', $client);

   my $packetno = -1;
   if ( $packet->{data_len} >= 5 ) {
      $packetno = to_num(substr($packet->{data}, 6, 2));
   }
   if ( !exists $self->{sessions}->{$client} ) {
      if ( $packet->{syn} ) {
         MKDEBUG && _d('New session (SYN)');
      }
      elsif ( $packetno == 0 ) {
         MKDEBUG && _d('New session (packetno 0)');
      }
      else {
         MKDEBUG && _d('Ignoring mid-stream', $packet_from, 'data,',
            'packetno', $packetno);
         return;
      }

      $self->{sessions}->{$client} = {
         client        => $client,
         ts            => $packet->{ts},
         state         => undef,
         compress      => undef,
         raw_packets   => [],
         buff          => '',
         sths          => {},
         attribs       => {},
         n_queries     => 0,
      };
   }
   my $session = $self->{sessions}->{$client};
   MKDEBUG && _d('Client state:', $session->{state});

   push @{$session->{raw_packets}}, $packet->{raw_packet};

   if ( $packet->{syn} && ($session->{n_queries} > 0 || $session->{state}) ) {
      MKDEBUG && _d('Client port reuse and last session did not quit');
      $self->fail_session($session,
            'client port reuse and last session did not quit');
      return $self->parse_event(%args);
   }

   if ( $packet->{data_len} == 0 ) {
      MKDEBUG && _d('TCP control:',
         map { uc $_ } grep { $packet->{$_} } qw(syn ack fin rst));
      return;
   }

   if ( $session->{compress} ) {
      return unless $self->uncompress_packet($packet, $session);
   }

   if ( $session->{buff} && $packet_from eq 'client' ) {
      $session->{buff}      .= $packet->{data};
      $packet->{data}        = $session->{buff};
      $session->{buff_left} -= $packet->{data_len};

      $packet->{mysql_data_len} = $session->{mysql_data_len};
      $packet->{number}         = $session->{number};

      MKDEBUG && _d('Appending data to buff; expecting',
         $session->{buff_left}, 'more bytes');
   }
   else { 
      eval {
         remove_mysql_header($packet);
      };
      if ( $EVAL_ERROR ) {
         MKDEBUG && _d('remove_mysql_header() failed; failing session');
         $session->{EVAL_ERROR} = $EVAL_ERROR;
         $self->fail_session($session, 'remove_mysql_header() failed');
         return;
      }
   }

   my $event;
   if ( $packet_from eq 'server' ) {
      $event = $self->_packet_from_server($packet, $session, $args{misc});
   }
   elsif ( $packet_from eq 'client' ) {
      if ( $session->{buff} ) {
         if ( $session->{buff_left} <= 0 ) {
            MKDEBUG && _d('Data is complete');
            $self->_delete_buff($session);
         }
         else {
            return;  # waiting for more data; buff_left was reported earlier
         }
      }
      elsif ( $packet->{mysql_data_len} > ($packet->{data_len} - 4) ) {

         if ( $session->{cmd} && ($session->{state} || '') eq 'awaiting_reply' ) {
            MKDEBUG && _d('No server OK to previous command (frag)');
            $self->fail_session($session, 'no server OK to previous command');
            $packet->{data} = $packet->{mysql_hdr} . $packet->{data};
            return $self->parse_event(%args);
         }

         $session->{buff}           = $packet->{data};
         $session->{mysql_data_len} = $packet->{mysql_data_len};
         $session->{number}         = $packet->{number};

         $session->{buff_left}
            ||= $packet->{mysql_data_len} - ($packet->{data_len} - 4);

         MKDEBUG && _d('Data not complete; expecting',
            $session->{buff_left}, 'more bytes');
         return;
      }

      if ( $session->{cmd} && ($session->{state} || '') eq 'awaiting_reply' ) {
         MKDEBUG && _d('No server OK to previous command');
         $self->fail_session($session, 'no server OK to previous command');
         $packet->{data} = $packet->{mysql_hdr} . $packet->{data};
         return $self->parse_event(%args);
      }

      $event = $self->_packet_from_client($packet, $session, $args{misc});
   }
   else {
      die 'Packet origin unknown';
   }

   MKDEBUG && _d('Done parsing packet; client state:', $session->{state});
   if ( $session->{closed} ) {
      delete $self->{sessions}->{$session->{client}};
      MKDEBUG && _d('Session deleted');
   }

   $args{stats}->{events_parsed}++ if $args{stats};
   return $event;
}

sub _packet_from_server {
   my ( $self, $packet, $session, $misc ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;

   MKDEBUG && _d('Packet is from server; client state:', $session->{state}); 

   if ( ($session->{server_seq} || '') eq $packet->{seq} ) {
      push @{ $session->{server_retransmissions} }, $packet->{seq};
      MKDEBUG && _d('TCP retransmission');
      return;
   }
   $session->{server_seq} = $packet->{seq};

   my $data = $packet->{data};


   my ( $first_byte ) = substr($data, 0, 2, '');
   MKDEBUG && _d('First byte of packet:', $first_byte);
   if ( !$first_byte ) {
      $self->fail_session($session, 'no first byte');
      return;
   }

   if ( !$session->{state} ) {
      if ( $first_byte eq '0a' && length $data >= 33 && $data =~ m/00{13}/ ) {
         my $handshake = parse_server_handshake_packet($data);
         if ( !$handshake ) {
            $self->fail_session($session, 'failed to parse server handshake');
            return;
         }
         $session->{state}     = 'server_handshake';
         $session->{thread_id} = $handshake->{thread_id};

         $session->{ts} = $packet->{ts} unless $session->{ts};
      }
      elsif ( $session->{buff} ) {
         $self->fail_session($session,
            'got server response before full buffer');
         return;
      }
      else {
         MKDEBUG && _d('Ignoring mid-stream server response');
         return;
      }
   }
   else {
      if ( $first_byte eq '00' ) { 
         if ( ($session->{state} || '') eq 'client_auth' ) {

            $session->{compress} = $session->{will_compress};
            delete $session->{will_compress};
            MKDEBUG && $session->{compress} && _d('Packets will be compressed');

            MKDEBUG && _d('Admin command: Connect');
            return $self->_make_event(
               {  cmd => 'Admin',
                  arg => 'administrator command: Connect',
                  ts  => $packet->{ts}, # Events are timestamped when they end
               },
               $packet, $session
            );
         }
         elsif ( $session->{cmd} ) {
            my $com = $session->{cmd}->{cmd};
            my $ok;
            if ( $com eq COM_STMT_PREPARE ) {
               MKDEBUG && _d('OK for prepared statement');
               $ok = parse_ok_prepared_statement_packet($data);
               if ( !$ok ) {
                  $self->fail_session($session,
                     'failed to parse OK prepared statement packet');
                  return;
               }
               my $sth_id = $ok->{sth_id};
               $session->{attribs}->{Statement_id} = $sth_id;

               $session->{sths}->{$sth_id} = $ok;
               $session->{sths}->{$sth_id}->{statement}
                  = $session->{cmd}->{arg};
            }
            else {
               $ok  = parse_ok_packet($data);
               if ( !$ok ) {
                  $self->fail_session($session, 'failed to parse OK packet');
                  return;
               }
            }

            my $arg;
            if ( $com eq COM_QUERY
                 || $com eq COM_STMT_EXECUTE || $com eq COM_STMT_RESET ) {
               $com = 'Query';
               $arg = $session->{cmd}->{arg};
            }
            elsif ( $com eq COM_STMT_PREPARE ) {
               $com = 'Query';
               $arg = "PREPARE $session->{cmd}->{arg}";
            }
            else {
               $arg = 'administrator command: '
                    . ucfirst(lc(substr($com_for{$com}, 4)));
               $com = 'Admin';
            }

            return $self->_make_event(
               {  cmd           => $com,
                  arg           => $arg,
                  ts            => $packet->{ts},
                  Insert_id     => $ok->{insert_id},
                  Warning_count => $ok->{warnings},
                  Rows_affected => $ok->{affected_rows},
               },
               $packet, $session
            );
         } 
         else {
            MKDEBUG && _d('Looks like an OK packet but session has no cmd');
         }
      }
      elsif ( $first_byte eq 'ff' ) {
         my $error = parse_error_packet($data);
         if ( !$error ) {
            $self->fail_session($session, 'failed to parse error packet');
            return;
         }
         my $event;

         if ( $session->{state} eq 'client_auth' ) {
            MKDEBUG && _d('Connection failed');
            $event = {
               cmd      => 'Admin',
               arg      => 'administrator command: Connect',
               ts       => $packet->{ts},
               Error_no => $error->{errno},
            };
            $session->{attribs}->{Error_msg} = $error->{message};
            $session->{closed} = 1;  # delete session when done
            return $self->_make_event($event, $packet, $session);
         }
         elsif ( $session->{cmd} ) {
            my $com = $session->{cmd}->{cmd};
            my $arg;

            if ( $com eq COM_QUERY || $com eq COM_STMT_EXECUTE ) {
               $com = 'Query';
               $arg = $session->{cmd}->{arg};
            }
            else {
               $arg = 'administrator command: '
                    . ucfirst(lc(substr($com_for{$com}, 4)));
               $com = 'Admin';
            }

            $event = {
               cmd       => $com,
               arg       => $arg,
               ts        => $packet->{ts},
               Error_no  => $error->{errno} ? "#$error->{errno}" : 'none',
            };
            $session->{attribs}->{Error_msg} = $error->{message};
            return $self->_make_event($event, $packet, $session);
         }
         else {
            MKDEBUG && _d('Looks like an error packet but client is not '
               . 'authenticating and session has no cmd');
         }
      }
      elsif ( $first_byte eq 'fe' && $packet->{mysql_data_len} < 9 ) {
         if ( $packet->{mysql_data_len} == 1
              && $session->{state} eq 'client_auth'
              && $packet->{number} == 2 )
         {
            MKDEBUG && _d('Server has old password table;',
               'client will resend password using old algorithm');
            $session->{state} = 'client_auth_resend';
         }
         else {
            MKDEBUG && _d('Got an EOF packet');
            $self->fail_session($session, 'got an unexpected EOF packet');
         }
      }
      else {
         if ( $session->{cmd} ) {
            MKDEBUG && _d('Got a row/field/result packet');
            my $com = $session->{cmd}->{cmd};
            MKDEBUG && _d('Responding to client', $com_for{$com});
            my $event = { ts  => $packet->{ts} };
            if ( $com eq COM_QUERY || $com eq COM_STMT_EXECUTE ) {
               $event->{cmd} = 'Query';
               $event->{arg} = $session->{cmd}->{arg};
            }
            else {
               $event->{arg} = 'administrator command: '
                    . ucfirst(lc(substr($com_for{$com}, 4)));
               $event->{cmd} = 'Admin';
            }

            if ( $packet->{complete} ) {
               my ( $warning_count, $status_flags )
                  = $data =~ m/fe(.{4})(.{4})\Z/;
               if ( $warning_count ) { 
                  $event->{Warnings} = to_num($warning_count);
                  my $flags = to_num($status_flags); # TODO set all flags?
                  $event->{No_good_index_used}
                     = $flags & SERVER_QUERY_NO_GOOD_INDEX_USED ? 1 : 0;
                  $event->{No_index_used}
                     = $flags & SERVER_QUERY_NO_INDEX_USED ? 1 : 0;
               }
            }

            return $self->_make_event($event, $packet, $session);
         }
         else {
            MKDEBUG && _d('Unknown in-stream server response');
         }
      }
   }

   return;
}

sub _packet_from_client {
   my ( $self, $packet, $session, $misc ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;

   MKDEBUG && _d('Packet is from client; state:', $session->{state}); 

   if ( ($session->{client_seq} || '') eq $packet->{seq} ) {
      push @{ $session->{client_retransmissions} }, $packet->{seq};
      MKDEBUG && _d('TCP retransmission');
      return;
   }
   $session->{client_seq} = $packet->{seq};

   my $data  = $packet->{data};
   my $ts    = $packet->{ts};

   if ( ($session->{state} || '') eq 'server_handshake' ) {
      MKDEBUG && _d('Expecting client authentication packet');
      my $handshake = parse_client_handshake_packet($data);
      if ( !$handshake ) {
         $self->fail_session($session, 'failed to parse client handshake');
         return;
      }
      $session->{state}         = 'client_auth';
      $session->{pos_in_log}    = $packet->{pos_in_log};
      $session->{user}          = $handshake->{user};
      $session->{db}            = $handshake->{db};

      $session->{will_compress} = $handshake->{flags}->{CLIENT_COMPRESS};
   }
   elsif ( ($session->{state} || '') eq 'client_auth_resend' ) {
      MKDEBUG && _d('Client resending password using old algorithm');
      $session->{state} = 'client_auth';
   }
   elsif ( ($session->{state} || '') eq 'awaiting_reply' ) {
      my $arg = $session->{cmd}->{arg} ? substr($session->{cmd}->{arg}, 0, 50)
              : 'unknown';
      MKDEBUG && _d('More data for previous command:', $arg, '...'); 
      return;
   }
   else {
      if ( $packet->{number} != 0 ) {
         $self->fail_session($session, 'client cmd not packet 0');
         return;
      }

      if ( !defined $session->{compress} ) {
         return unless $self->detect_compression($packet, $session);
         $data = $packet->{data};
      }

      my $com = parse_com_packet($data, $packet->{mysql_data_len});
      if ( !$com ) {
         $self->fail_session($session, 'failed to parse COM packet');
         return;
      }

      if ( $com->{code} eq COM_STMT_EXECUTE ) {
         MKDEBUG && _d('Execute prepared statement');
         my $exec = parse_execute_packet($com->{data}, $session->{sths});
         if ( !$exec ) {
            MKDEBUG && _d('Failed to parse execute packet');
            $session->{state} = undef;
            return;
         }
         $com->{data} = $exec->{arg};
         $session->{attribs}->{Statement_id} = $exec->{sth_id};
      }
      elsif ( $com->{code} eq COM_STMT_RESET ) {
         my $sth_id = get_sth_id($com->{data});
         if ( !$sth_id ) {
            $self->fail_session($session,
               'failed to parse prepared statement reset packet');
            return;
         }
         $com->{data} = "RESET $sth_id";
         $session->{attribs}->{Statement_id} = $sth_id;
      }

      $session->{state}      = 'awaiting_reply';
      $session->{pos_in_log} = $packet->{pos_in_log};
      $session->{ts}         = $ts;
      $session->{cmd}        = {
         cmd => $com->{code},
         arg => $com->{data},
      };

      if ( $com->{code} eq COM_QUIT ) { # Fire right away; will cleanup later.
         MKDEBUG && _d('Got a COM_QUIT');

         $session->{closed} = 1;  # delete session when done

         return $self->_make_event(
            {  cmd       => 'Admin',
               arg       => 'administrator command: Quit',
               ts        => $ts,
            },
            $packet, $session
         );
      }
      elsif ( $com->{code} eq COM_STMT_CLOSE ) {
         my $sth_id = get_sth_id($com->{data});
         if ( !$sth_id ) {
            $self->fail_session($session,
               'failed to parse prepared statement close packet');
            return;
         }
         delete $session->{sths}->{$sth_id};
         return $self->_make_event(
            {  cmd       => 'Query',
               arg       => "DEALLOCATE PREPARE $sth_id",
               ts        => $ts,
            },
            $packet, $session
         );
      }
   }

   return;
}

sub _make_event {
   my ( $self, $event, $packet, $session ) = @_;
   MKDEBUG && _d('Making event');

   $session->{raw_packets}  = [];
   $self->_delete_buff($session);

   if ( !$session->{thread_id} ) {
      MKDEBUG && _d('Giving session fake thread id', $self->{fake_thread_id});
      $session->{thread_id} = $self->{fake_thread_id}++;
   }

   my ($host, $port) = $session->{client} =~ m/((?:\d+\.){3}\d+)\:(\w+)/;
   my $new_event = {
      cmd        => $event->{cmd},
      arg        => $event->{arg},
      bytes      => length( $event->{arg} ),
      ts         => tcp_timestamp( $event->{ts} ),
      host       => $host,
      ip         => $host,
      port       => $port,
      db         => $session->{db},
      user       => $session->{user},
      Thread_id  => $session->{thread_id},
      pos_in_log => $session->{pos_in_log},
      Query_time => timestamp_diff($session->{ts}, $packet->{ts}),
      Error_no   => $event->{Error_no} || 'none',
      Rows_affected      => ($event->{Rows_affected} || 0),
      Warning_count      => ($event->{Warning_count} || 0),
      No_good_index_used => ($event->{No_good_index_used} ? 'Yes' : 'No'),
      No_index_used      => ($event->{No_index_used}      ? 'Yes' : 'No'),
   };
   @{$new_event}{keys %{$session->{attribs}}} = values %{$session->{attribs}};
   MKDEBUG && _d('Properties of event:', Dumper($new_event));

   delete $session->{cmd};

   $session->{state} = undef;

   $session->{attribs} = {};

   $session->{n_queries}++;
   $session->{server_retransmissions} = [];
   $session->{client_retransmissions} = [];

   return $new_event;
}

sub tcp_timestamp {
   my ( $ts ) = @_;
   $ts =~ s/^\d\d(\d\d)-(\d\d)-(\d\d)/$1$2$3/;
   return $ts;
}

sub timestamp_diff {
   my ( $start, $end ) = @_;
   my $sd = substr($start, 0, 11, '');
   my $ed = substr($end,   0, 11, '');
   my ( $sh, $sm, $ss ) = split(/:/, $start);
   my ( $eh, $em, $es ) = split(/:/, $end);
   my $esecs = ($eh * 3600 + $em * 60 + $es);
   my $ssecs = ($sh * 3600 + $sm * 60 + $ss);
   if ( $sd eq $ed ) {
      return sprintf '%.6f', $esecs - $ssecs;
   }
   else { # Assume only one day boundary has been crossed, no DST, etc
      return sprintf '%.6f', ( 86_400 - $ssecs ) + $esecs;
   }
}

sub to_string {
   my ( $data ) = @_;
   return pack('H*', $data);
}

sub unpack_string {
   my ( $data ) = @_;
   my $len        = 0;
   my $encode_len = 0;
   ($data, $len, $encode_len) = decode_len($data);
   my $t = 'H' . ($len ? $len * 2 : '*');
   $data = pack($t, $data);
   return "\"$data\"", $encode_len + $len;
}

sub decode_len {
   my ( $data ) = @_;
   return unless $data;

   my $first_byte = to_num(substr($data, 0, 2, ''));

   my $len;
   my $encode_len;
   if ( $first_byte <= 251 ) {
      $len        = $first_byte;
      $encode_len = 1;
   }
   elsif ( $first_byte == 252 ) {
      $len        = to_num(substr($data, 4, ''));
      $encode_len = 2;
   }
   elsif ( $first_byte == 253 ) {
      $len        = to_num(substr($data, 6, ''));
      $encode_len = 3;
   }
   elsif ( $first_byte == 254 ) {
      $len        = to_num(substr($data, 16, ''));
      $encode_len = 8;
   }
   else {
      MKDEBUG && _d('data:', $data, 'first byte:', $first_byte);
      die "Invalid length encoded byte: $first_byte";
   }

   MKDEBUG && _d('len:', $len, 'encode len', $encode_len);
   return $data, $len, $encode_len;
}

sub to_num {
   my ( $str, $len ) = @_;
   if ( $len ) {
      $str = substr($str, 0, $len * 2);
   }
   my @bytes = $str =~ m/(..)/g;
   my $result = 0;
   foreach my $i ( 0 .. $#bytes ) {
      $result += hex($bytes[$i]) * (16 ** ($i * 2));
   }
   return $result;
}

sub to_double {
   my ( $str ) = @_;
   return unpack('d', pack('H*', $str));
}

sub get_lcb {
   my ( $string ) = @_;
   my $first_byte = hex(substr($$string, 0, 2, ''));
   if ( $first_byte < 251 ) {
      return $first_byte;
   }
   elsif ( $first_byte == 252 ) {
      return to_num(substr($$string, 0, 4, ''));
   }
   elsif ( $first_byte == 253 ) {
      return to_num(substr($$string, 0, 6, ''));
   }
   elsif ( $first_byte == 254 ) {
      return to_num(substr($$string, 0, 16, ''));
   }
}

sub parse_error_packet {
   my ( $data ) = @_;
   return unless $data;
   MKDEBUG && _d('ERROR data:', $data);
   if ( length $data < 16 ) {
      MKDEBUG && _d('Error packet is too short:', $data);
      return;
   }
   my $errno    = to_num(substr($data, 0, 4));
   my $marker   = to_string(substr($data, 4, 2));
   return unless $marker eq '#';
   my $sqlstate = to_string(substr($data, 6, 10));
   my $message  = to_string(substr($data, 16));
   my $pkt = {
      errno    => $errno,
      sqlstate => $marker . $sqlstate,
      message  => $message,
   };
   MKDEBUG && _d('Error packet:', Dumper($pkt));
   return $pkt;
}

sub parse_ok_packet {
   my ( $data ) = @_;
   return unless $data;
   MKDEBUG && _d('OK data:', $data);
   if ( length $data < 12 ) {
      MKDEBUG && _d('OK packet is too short:', $data);
      return;
   }
   my $affected_rows = get_lcb(\$data);
   my $insert_id     = get_lcb(\$data);
   my $status        = to_num(substr($data, 0, 4, ''));
   my $warnings      = to_num(substr($data, 0, 4, ''));
   my $message       = to_string($data);
   my $pkt = {
      affected_rows => $affected_rows,
      insert_id     => $insert_id,
      status        => $status,
      warnings      => $warnings,
      message       => $message,
   };
   MKDEBUG && _d('OK packet:', Dumper($pkt));
   return $pkt;
}

sub parse_ok_prepared_statement_packet {
   my ( $data ) = @_;
   return unless $data;
   MKDEBUG && _d('OK prepared statement data:', $data);
   if ( length $data < 8 ) {
      MKDEBUG && _d('OK prepared statement packet is too short:', $data);
      return;
   }
   my $sth_id     = to_num(substr($data, 0, 8, ''));
   my $num_cols   = to_num(substr($data, 0, 4, ''));
   my $num_params = to_num(substr($data, 0, 4, ''));
   my $pkt = {
      sth_id     => $sth_id,
      num_cols   => $num_cols,
      num_params => $num_params,
   };
   MKDEBUG && _d('OK prepared packet:', Dumper($pkt));
   return $pkt;
}

sub parse_server_handshake_packet {
   my ( $data ) = @_;
   return unless $data;
   MKDEBUG && _d('Server handshake data:', $data);
   my $handshake_pattern = qr{
      ^                 # -----                ----
      (.+?)00           # n Null-Term String   server_version
      (.{8})            # 4                    thread_id
      .{16}             # 8                    scramble_buff
      .{2}              # 1                    filler: always 0x00
      (.{4})            # 2                    server_capabilities
      .{2}              # 1                    server_language
      .{4}              # 2                    server_status
      .{26}             # 13                   filler: always 0x00
   }x;
   my ( $server_version, $thread_id, $flags ) = $data =~ m/$handshake_pattern/;
   my $pkt = {
      server_version => to_string($server_version),
      thread_id      => to_num($thread_id),
      flags          => parse_flags($flags),
   };
   MKDEBUG && _d('Server handshake packet:', Dumper($pkt));
   return $pkt;
}

sub parse_client_handshake_packet {
   my ( $data ) = @_;
   return unless $data;
   MKDEBUG && _d('Client handshake data:', $data);
   my ( $flags, $user, $buff_len ) = $data =~ m{
      ^
      (.{8})         # Client flags
      .{10}          # Max packet size, charset
      (?:00){23}     # Filler
      ((?:..)+?)00   # Null-terminated user name
      (..)           # Length-coding byte for scramble buff
   }x;

   if ( !$buff_len ) {
      MKDEBUG && _d('Did not match client handshake packet');
      return;
   }

   my $code_len = hex($buff_len);
   my ( $db ) = $data =~ m!
      ^.{64}${user}00..   # Everything matched before
      (?:..){$code_len}   # The scramble buffer
      (.*)00\Z            # The database name
   !x;
   my $pkt = {
      user  => to_string($user),
      db    => $db ? to_string($db) : '',
      flags => parse_flags($flags),
   };
   MKDEBUG && _d('Client handshake packet:', Dumper($pkt));
   return $pkt;
}

sub parse_com_packet {
   my ( $data, $len ) = @_;
   return unless $data && $len;
   MKDEBUG && _d('COM data:',
      (substr($data, 0, 100).(length $data > 100 ? '...' : '')),
      'len:', $len);
   my $code = substr($data, 0, 2);
   my $com  = $com_for{$code};
   if ( !$com ) {
      MKDEBUG && _d('Did not match COM packet');
      return;
   }
   if (    $code ne COM_STMT_EXECUTE
        && $code ne COM_STMT_CLOSE
        && $code ne COM_STMT_RESET )
   {
      $data = to_string(substr($data, 2, ($len - 1) * 2));
   }
   my $pkt = {
      code => $code,
      com  => $com,
      data => $data,
   };
   MKDEBUG && _d('COM packet:', Dumper($pkt));
   return $pkt;
}

sub parse_execute_packet {
   my ( $data, $sths ) = @_;
   return unless $data && $sths;

   my $sth_id = to_num(substr($data, 2, 8));
   return unless defined $sth_id;

   my $sth = $sths->{$sth_id};
   if ( !$sth ) {
      MKDEBUG && _d('Skipping unknown statement handle', $sth_id);
      return;
   }
   my $null_count  = int(($sth->{num_params} + 7) / 8) || 1;
   my $null_bitmap = to_num(substr($data, 20, $null_count * 2));
   MKDEBUG && _d('NULL bitmap:', $null_bitmap, 'count:', $null_count);
   
   substr($data, 0, 20 + ($null_count * 2), '');

   my $new_params = to_num(substr($data, 0, 2, ''));
   my @types; 
   if ( $new_params ) {
      MKDEBUG && _d('New param types');
      for my $i ( 0..($sth->{num_params}-1) ) {
         my $type = to_num(substr($data, 0, 4, ''));
         push @types, $type_for{$type};
         MKDEBUG && _d('Param', $i, 'type:', $type, $type_for{$type});
      }
      $sth->{types} = \@types;
   }
   else {
      @types = @{$sth->{types}} if $data;
   }


   my $arg  = $sth->{statement};
   MKDEBUG && _d('Statement:', $arg);
   for my $i ( 0..($sth->{num_params}-1) ) {
      my $val;
      my $len;  # in bytes
      if ( $null_bitmap & (2**$i) ) {
         MKDEBUG && _d('Param', $i, 'is NULL (bitmap)');
         $val = 'NULL';
         $len = 0;
      }
      else {
         if ( $unpack_type{$types[$i]} ) {
            ($val, $len) = $unpack_type{$types[$i]}->($data);
         }
         else {
            MKDEBUG && _d('No handler for param', $i, 'type', $types[$i]);
            $val = '?';
            $len = 0;
         }
      }

      MKDEBUG && _d('Param', $i, 'val:', $val);
      $arg =~ s/\?/$val/;

      substr($data, 0, $len * 2, '') if $len;
   }

   my $pkt = {
      sth_id => $sth_id,
      arg    => "EXECUTE $arg",
   };
   MKDEBUG && _d('Execute packet:', Dumper($pkt));
   return $pkt;
}

sub get_sth_id {
   my ( $data ) = @_;
   return unless $data;
   my $sth_id = to_num(substr($data, 2, 8));
   return $sth_id;
}

sub parse_flags {
   my ( $flags ) = @_;
   die "I need flags" unless $flags;
   MKDEBUG && _d('Flag data:', $flags);
   my %flags     = %flag_for;
   my $flags_dec = to_num($flags);
   foreach my $flag ( keys %flag_for ) {
      my $flagno    = $flag_for{$flag};
      $flags{$flag} = ($flags_dec & $flagno ? 1 : 0);
   }
   return \%flags;
}

sub uncompress_data {
   my ( $data, $len ) = @_;
   die "I need data" unless $data;
   die "I need a len argument" unless $len;
   die "I need a scalar reference to data" unless ref $data eq 'SCALAR';
   MKDEBUG && _d('Uncompressing data');
   our $InflateError;

   my $comp_bin_data = pack('H*', $$data);

   my $uncomp_bin_data = '';
   my $z = new IO::Uncompress::Inflate(
      \$comp_bin_data
   ) or die "IO::Uncompress::Inflate failed: $InflateError";
   my $status = $z->read(\$uncomp_bin_data, $len)
      or die "IO::Uncompress::Inflate failed: $InflateError";

   my $uncomp_data = unpack('H*', $uncomp_bin_data);

   return \$uncomp_data;
}

sub detect_compression {
   my ( $self, $packet, $session ) = @_;
   MKDEBUG && _d('Checking for client compression');
   my $com = parse_com_packet($packet->{data}, $packet->{mysql_data_len});
   if ( $com && $com->{code} eq COM_SLEEP ) {
      MKDEBUG && _d('Client is using compression');
      $session->{compress} = 1;

      $packet->{data} = $packet->{mysql_hdr} . $packet->{data};
      return 0 unless $self->uncompress_packet($packet, $session);
      remove_mysql_header($packet);
   }
   else {
      MKDEBUG && _d('Client is NOT using compression');
      $session->{compress} = 0;
   }
   return 1;
}

sub uncompress_packet {
   my ( $self, $packet, $session ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;


   my $data;
   my $comp_hdr;
   my $comp_data_len;
   my $pkt_num;
   my $uncomp_data_len;
   eval {
      $data            = \$packet->{data};
      $comp_hdr        = substr($$data, 0, 14, '');
      $comp_data_len   = to_num(substr($comp_hdr, 0, 6));
      $pkt_num         = to_num(substr($comp_hdr, 6, 2));
      $uncomp_data_len = to_num(substr($comp_hdr, 8, 6));
      MKDEBUG && _d('Compression header data:', $comp_hdr,
         'compressed data len (bytes)', $comp_data_len,
         'number', $pkt_num,
         'uncompressed data len (bytes)', $uncomp_data_len);
   };
   if ( $EVAL_ERROR ) {
      $session->{EVAL_ERROR} = $EVAL_ERROR;
      $self->fail_session($session, 'failed to parse compression header');
      return 0;
   }

   if ( $uncomp_data_len ) {
      eval {
         $data = uncompress_data($data, $uncomp_data_len);
         $packet->{data} = $$data;
      };
      if ( $EVAL_ERROR ) {
         $session->{EVAL_ERROR} = $EVAL_ERROR;
         $self->fail_session($session, 'failed to uncompress data');
         die "Cannot uncompress packet.  Check that IO::Uncompress::Inflate "
            . "is installed.\nError: $EVAL_ERROR";
      }
   }
   else {
      MKDEBUG && _d('Packet is not really compressed');
      $packet->{data} = $$data;
   }

   return 1;
}

sub remove_mysql_header {
   my ( $packet ) = @_;
   die "I need a packet" unless $packet;

   my $mysql_hdr      = substr($packet->{data}, 0, 8, '');
   my $mysql_data_len = to_num(substr($mysql_hdr, 0, 6));
   my $pkt_num        = to_num(substr($mysql_hdr, 6, 2));
   MKDEBUG && _d('MySQL packet: header data', $mysql_hdr,
      'data len (bytes)', $mysql_data_len, 'number', $pkt_num);

   $packet->{mysql_hdr}      = $mysql_hdr;
   $packet->{mysql_data_len} = $mysql_data_len;
   $packet->{number}         = $pkt_num;

   return;
}

sub _get_errors_fh {
   my ( $self ) = @_;
   my $errors_fh = $self->{errors_fh};
   return $errors_fh if $errors_fh;

   my $o = $self->{o};
   if ( $o && $o->has('tcpdump-errors') && $o->got('tcpdump-errors') ) {
      my $errors_file = $o->get('tcpdump-errors');
      MKDEBUG && _d('tcpdump-errors file:', $errors_file);
      open $errors_fh, '>>', $errors_file
         or die "Cannot open tcpdump-errors file $errors_file: $OS_ERROR";
   }

   $self->{errors_fh} = $errors_fh;
   return $errors_fh;
}

sub fail_session {
   my ( $self, $session, $reason ) = @_;
   MKDEBUG && _d('Client', $session->{client}, 'failed because', $reason);
   my $errors_fh = $self->_get_errors_fh();
   if ( $errors_fh ) {
      my $raw_packets = $session->{raw_packets};
      delete $session->{raw_packets};  # Don't dump, it's printed below.
      $session->{reason_for_failure} = $reason;
      my $session_dump = '# ' . Dumper($session);
      chomp $session_dump;
      $session_dump =~ s/\n/\n# /g;
      print $errors_fh "$session_dump\n";
      {
         local $LIST_SEPARATOR = "\n";
         print $errors_fh "@$raw_packets";
         print $errors_fh "\n";
      }
   }
   delete $self->{sessions}->{$session->{client}};
   return;
}

sub _delete_buff {
   my ( $self, $session ) = @_;
   map { delete $session->{$_} } qw(buff buff_left mysql_data_len);
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End MySQLProtocolParser package
# ###########################################################################

# ###########################################################################
# SysLogParser package 5831
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/SysLogParser.pm
#   trunk/common/t/SysLogParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package SysLogParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Data::Dumper;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

my $syslog_regex = qr{\A.*\w+\[\d+\]: \[(\d+)-(\d+)\] (.*)\Z};

sub new {
   my ( $class ) = @_;
   my $self = {};
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my ( $next_event, $tell, $is_syslog ) = $self->generate_wrappers(%args);
   return $next_event->();
}

sub generate_wrappers {
   my ( $self, %args ) = @_;

   if ( ($self->{sanity} || '') ne "$args{next_event}" ){
      MKDEBUG && _d("Clearing and recreating internal state");
      @{$self}{qw(next_event tell is_syslog)} = $self->make_closures(%args);
      $self->{sanity} = "$args{next_event}";
   }

   return @{$self}{qw(next_event tell is_syslog)};
}

sub make_closures {
   my ( $self, %args ) = @_;

   my $next_event     = $args{'next_event'};
   my $tell           = $args{'tell'};
   my $new_event_test = $args{'misc'}->{'new_event_test'};
   my $line_filter    = $args{'misc'}->{'line_filter'};

   my $test_line = $next_event->();
   MKDEBUG && _d('Read first sample/test line:', $test_line);

   if ( defined $test_line && $test_line =~ m/$syslog_regex/o ) {

      MKDEBUG && _d('This looks like a syslog line, MKDEBUG prefix=LLSP');

      my ($msg_nr, $line_nr, $content) = $test_line =~ m/$syslog_regex/o;
      my @pending = ($test_line);
      my $last_msg_nr = $msg_nr;
      my $pos_in_log  = 0;

      my $new_next_event = sub {
         MKDEBUG && _d('LLSP: next_event()');

         MKDEBUG && _d('LLSP: Current virtual $fh position:', $pos_in_log);
         my $new_pos = 0;

         my @arg_lines;

         my $line;
         LINE:
         while (
            defined($line = shift @pending)
            || do {
               eval { $new_pos = -1; $new_pos = $tell->() };
               defined($line = $next_event->());
            }
         ) {
            MKDEBUG && _d('LLSP: Line:', $line);

            ($msg_nr, $line_nr, $content) = $line =~ m/$syslog_regex/o;
            if ( !$msg_nr ) {
               die "Can't parse line: $line";
            }

            elsif ( $msg_nr != $last_msg_nr ) {
               MKDEBUG && _d('LLSP: $msg_nr', $last_msg_nr, '=>', $msg_nr);
               $last_msg_nr = $msg_nr;
               last LINE;
            }

            elsif ( @arg_lines && $new_event_test && $new_event_test->($content) ) {
               MKDEBUG && _d('LLSP: $new_event_test matches');
               last LINE;
            }

            $content =~ s/#(\d{3})/chr(oct($1))/ge;
            $content =~ s/\^I/\t/g;
            if ( $line_filter ) {
               MKDEBUG && _d('LLSP: applying $line_filter');
               $content = $line_filter->($content);
            }

            push @arg_lines, $content;
         }
         MKDEBUG && _d('LLSP: Exited while-loop after finding a complete entry');

         my $psql_log_event = @arg_lines ? join('', @arg_lines) : undef;
         MKDEBUG && _d('LLSP: Final log entry:', $psql_log_event);

         if ( defined $line ) {
            MKDEBUG && _d('LLSP: Saving $line:', $line);
            @pending = $line;
            MKDEBUG && _d('LLSP: $pos_in_log:', $pos_in_log, '=>', $new_pos);
            $pos_in_log = $new_pos;
         }
         else {
            MKDEBUG && _d('LLSP: EOF reached');
            @pending     = ();
            $last_msg_nr = 0;
         }

         return $psql_log_event;
      };

      my $new_tell = sub {
         MKDEBUG && _d('LLSP: tell()', $pos_in_log);
         return $pos_in_log;
      };

      return ($new_next_event, $new_tell, 1);
   }

   else {

      MKDEBUG && _d('Plain log, or we are at EOF; MKDEBUG prefix=PLAIN');

      my @pending = defined $test_line ? ($test_line) : ();

      my $new_next_event = sub {
         MKDEBUG && _d('PLAIN: next_event(); @pending:', scalar @pending);
         return @pending ? shift @pending : $next_event->();
      };
      my $new_tell = sub {
         MKDEBUG && _d('PLAIN: tell(); @pending:', scalar @pending);
         return @pending ? 0 : $tell->();
      };
      return ($new_next_event, $new_tell, 0);
   }
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End SysLogParser package
# ###########################################################################

# ###########################################################################
# PgLogParser package 5835
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/PgLogParser.pm
#   trunk/common/t/PgLogParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package PgLogParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Data::Dumper;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

my $log_line_regex = qr{
   (LOG|DEBUG|CONTEXT|WARNING|ERROR|FATAL|PANIC|HINT
    |DETAIL|NOTICE|STATEMENT|INFO|LOCATION)
   :\s\s+
   }x;

my %attrib_name_for = (
   u => 'user',
   d => 'db',
   r => 'host', # With port
   h => 'host',
   p => 'Process_id',
   t => 'ts',
   m => 'ts',   # With milliseconds
   i => 'Query_type',
   c => 'Session_id',
   l => 'Line_no',
   s => 'Session_id',
   v => 'Vrt_trx_id',
   x => 'Trx_id',
);

sub new {
   my ( $class ) = @_;
   my $self = {
      pending    => [],
      is_syslog  => undef,
      next_event => undef,
      'tell'     => undef,
   };
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(next_event tell);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   my ( $next_event, $tell, $is_syslog ) = $self->generate_wrappers(%args);

   my @properties = ();

   my ($pos_in_log, $line, $was_pending) = $self->get_line();
   my $new_pos;

   my @arg_lines;

   my $done;

   my $got_duration;

   if ( !$was_pending && (!defined $line || $line !~ m/$log_line_regex/o) ) {
      MKDEBUG && _d('Skipping lines until I find a header');
      my $found_header;
      LINE:
      while (
         eval {
            ($new_pos, $line) = $self->get_line();
            defined $line;
         }
      ) {
         if ( $line =~ m/$log_line_regex/o ) {
            $pos_in_log = $new_pos;
            last LINE;
         }
         else {
            MKDEBUG && _d('Line was not a header, will fetch another');
         }
      }
      MKDEBUG && _d('Found a header line, now at pos_in_line', $pos_in_log);
   }

   my $first_line;

   my $line_type;

   LINE:
   while ( !$done && defined $line ) {

      chomp $line unless $is_syslog;

      if ( (($line_type) = $line =~ m/$log_line_regex/o) && $line_type ne 'LOG' ) {

         if ( @arg_lines ) {
            MKDEBUG && _d('Found a non-LOG line, exiting loop');
            last LINE;
         }

         else {
            $first_line ||= $line;

            if ( my ($e) = $line =~ m/ERROR:\s+(\S.*)\Z/s ) {
               push @properties, 'Error_msg', $e;
               MKDEBUG && _d('Found an error msg, saving and continuing');
               ($new_pos, $line) = $self->get_line();
               next LINE;
            }

            elsif ( my ($s) = $line =~ m/STATEMENT:\s+(\S.*)\Z/s ) {
               push @properties, 'arg', $s, 'cmd', 'Query';
               MKDEBUG && _d('Found a statement, finishing up event');
               $done = 1;
               last LINE;
            }

            else {
               MKDEBUG && _d("I don't know what to do with this line");
            }
         }

      }

      if (
         $line =~ m{
            Address\sfamily\snot\ssupported\sby\sprotocol
            |archived\stransaction\slog\sfile
            |autovacuum:\sprocessing\sdatabase
            |checkpoint\srecord\sis\sat
            |checkpoints\sare\soccurring\stoo\sfrequently\s\(
            |could\snot\sreceive\sdata\sfrom\sclient
            |database\ssystem\sis\sready
            |database\ssystem\sis\sshut\sdown
            |database\ssystem\swas\sshut\sdown
            |incomplete\sstartup\spacket
            |invalid\slength\sof\sstartup\spacket
            |next\sMultiXactId:
            |next\stransaction\sID:
            |received\ssmart\sshutdown\srequest
            |recycled\stransaction\slog\sfile
            |redo\srecord\sis\sat
            |removing\sfile\s"
            |removing\stransaction\slog\sfile\s"
            |shutting\sdown
            |transaction\sID\swrap\slimit\sis
         }x
      ) {
         MKDEBUG && _d('Skipping this line because it matches skip-pattern');
         ($new_pos, $line) = $self->get_line();
         next LINE;
      }

      $first_line ||= $line;

      if ( $line !~ m/$log_line_regex/o && @arg_lines ) {

         if ( !$is_syslog ) {
            $line =~ s/\A\t?/\n/;
         }

         push @arg_lines, $line;
         MKDEBUG && _d('This was a continuation line');
      }

      elsif (
         my ( $sev, $label, $rest )
            = $line =~ m/$log_line_regex(.+?):\s+(.*)\Z/so
      ) {
         MKDEBUG && _d('Line is case 1 or case 3');

         if ( @arg_lines ) {
            $done = 1;
            MKDEBUG && _d('There are saved @arg_lines, we are done');

            if ( $label eq 'duration' && $rest =~ m/[0-9.]+\s+\S+\Z/ ) {
               if ( $got_duration ) {
                  MKDEBUG && _d('Discarding line, duration already found');
               }
               else {
                  push @properties, 'Query_time', $self->duration_to_secs($rest);
                  MKDEBUG && _d("Line's duration is for previous event:", $rest);
               }
            }
            else {
               $self->pending($new_pos, $line);
               MKDEBUG && _d('Deferred line');
            }
         }

         elsif ( $label =~ m/\A(?:duration|statement|query)\Z/ ) {
            MKDEBUG && _d('Case 1: start a multi-line event');

            if ( $label eq 'duration' ) {

               if (
                  (my ($dur, $stmt)
                     = $rest =~ m/([0-9.]+ \S+)\s+(?:statement|query): *(.*)\Z/s)
               ) {
                  push @properties, 'Query_time', $self->duration_to_secs($dur);
                  $got_duration = 1;
                  push @arg_lines, $stmt;
                  MKDEBUG && _d('Duration + statement');
               }

               else {
                  $first_line = undef;
                  ($pos_in_log, $line) = $self->get_line();
                  MKDEBUG && _d('Line applies to event we never saw, discarding');
                  next LINE;
               }
            }
            else {
               push @arg_lines, $rest;
               MKDEBUG && _d('Putting onto @arg_lines');
            }
         }

         else {
            $done = 1;
            MKDEBUG && _d('Line is case 3, event is done');

            if ( @arg_lines ) {
               $self->pending($new_pos, $line);
               MKDEBUG && _d('There was @arg_lines, putting line to pending');
            }

            else {
               MKDEBUG && _d('No need to defer, process event from this line now');
               push @properties, 'cmd', 'Admin', 'arg', $label;

               if ( $label =~ m/\A(?:dis)?connection(?: received| authorized)?\Z/ ) {
                  push @properties, $self->get_meta($rest);
               }

               else {
                  die "I don't understand line $line";
               }

            }
         }

      }

      else {
         die "I don't understand line $line";
      }

      if ( !$done ) {
         ($new_pos, $line) = $self->get_line();
      }
   } # LINE

   if ( !defined $line ) {
      MKDEBUG && _d('Line not defined, at EOF; calling oktorun(0) if exists');
      $args{oktorun}->(0) if $args{oktorun};
      if ( !@arg_lines ) {
         MKDEBUG && _d('No saved @arg_lines either, we are all done');
         return undef;
      }
   }

   if ( $line_type && $line_type ne 'LOG' ) {
      MKDEBUG && _d('Line is not a LOG line');

      if ( $line_type eq 'ERROR' ) {
         MKDEBUG && _d('Line is ERROR');

         if ( @arg_lines ) {
            MKDEBUG && _d('There is @arg_lines, will peek ahead one line');
            my ( $temp_pos, $temp_line ) = $self->get_line();
            my ( $type, $msg );
            if (
               defined $temp_line
               && ( ($type, $msg) = $temp_line =~ m/$log_line_regex(.*)/o )
               && ( $type ne 'STATEMENT' || $msg eq $arg_lines[-1] )
            ) {
               MKDEBUG && _d('Error/statement line pertain to current event');
               push @properties, 'Error_msg', $line =~ m/ERROR:\s*(\S.*)\Z/s;
               if ( $type ne 'STATEMENT' ) {
                  MKDEBUG && _d('Must save peeked line, it is a', $type);
                  $self->pending($temp_pos, $temp_line);
               }
            }
            elsif ( defined $temp_line && defined $type ) {
               MKDEBUG && _d('Error/statement line are a new event');
               $self->pending($new_pos, $line);
               $self->pending($temp_pos, $temp_line);
            }
            else {
               MKDEBUG && _d("Unknown line", $line);
            }
         }
      }
      else {
         MKDEBUG && _d("Unknown line", $line);
      }
   }

   if ( $done || @arg_lines ) {
      MKDEBUG && _d('Making event');

      push @properties, 'pos_in_log', $pos_in_log;

      if ( @arg_lines ) {
         MKDEBUG && _d('Assembling @arg_lines: ', scalar @arg_lines);
         push @properties, 'arg', join('', @arg_lines), 'cmd', 'Query';
      }

      if ( $first_line ) {
         if ( my ($ts) = $first_line =~ m/([0-9-]{10} [0-9:.]{8,12})/ ) {
            MKDEBUG && _d('Getting timestamp', $ts);
            push @properties, 'ts', $ts;
         }

         if ( my ($meta) = $first_line =~ m/(.*?)[A-Z]{3,}:  / ) {
            MKDEBUG && _d('Found a meta-data chunk:', $meta);
            push @properties, $self->get_meta($meta);
         }
      }

      MKDEBUG && _d('Properties of event:', Dumper(\@properties));
      my $event = { @properties };
      $event->{bytes} = length($event->{arg} || '');
      return $event;
   }

}

sub get_meta {
   my ( $self, $meta ) = @_;
   my @properties;
   foreach my $set ( $meta =~ m/(\w+=[^, ]+)/g ) {
      my ($key, $val) = split(/=/, $set);
      if ( $key && $val ) {
         if ( my $prop = $attrib_name_for{lc substr($key, 0, 1)} ) {
            push @properties, $prop, $val;
         }
         else {
            MKDEBUG && _d('Bad meta key', $set);
         }
      }
      else {
         MKDEBUG && _d("Can't figure out meta from", $set);
      }
   }
   return @properties;
}

sub get_line {
   my ( $self ) = @_;
   my ($pos, $line, $was_pending) = $self->pending;
   if ( ! defined $line ) {
      MKDEBUG && _d('Got nothing from pending, trying the $fh');
      my ( $next_event, $tell) = @{$self}{qw(next_event tell)};
      eval {
         $pos  = $tell->();
         $line = $next_event->();
      };
      if ( MKDEBUG && $EVAL_ERROR ) {
         _d($EVAL_ERROR);
      }
   }

   MKDEBUG && _d('Got pos/line:', $pos, $line);
   return ($pos, $line);
}

sub pending {
   my ( $self, $val, $pos_in_log ) = @_;
   my $was_pending;
   MKDEBUG && _d('In sub pending, val:', $val);
   if ( $val ) {
      push @{$self->{pending}}, [$val, $pos_in_log];
   }
   elsif ( @{$self->{pending}} ) {
      ($val, $pos_in_log) = @{ shift @{$self->{pending}} };
      $was_pending = 1;
   }
   MKDEBUG && _d('Return from pending:', $val, $pos_in_log);
   return ($val, $pos_in_log, $was_pending);
}

sub generate_wrappers {
   my ( $self, %args ) = @_;

   if ( ($self->{sanity} || '') ne "$args{next_event}" ){
      MKDEBUG && _d("Clearing and recreating internal state");
      eval { require SysLogParser; }; # Required for tests to work.
      my $sl = new SysLogParser();

      $args{misc}->{new_event_test} = sub {
         my ( $content ) = @_;
         return unless defined $content;
         return $content =~ m/$log_line_regex/o;
      };

      $args{misc}->{line_filter} = sub {
         my ( $content ) = @_;
         $content =~ s/\A\t/\n/;
         return $content;
      };

      @{$self}{qw(next_event tell is_syslog)} = $sl->make_closures(%args);
      $self->{sanity} = "$args{next_event}";
   }

   return @{$self}{qw(next_event tell is_syslog)};
}

sub duration_to_secs {
   my ( $self, $str ) = @_;
   MKDEBUG && _d('Duration:', $str);
   my ( $num, $suf ) = split(/\s+/, $str);
   my $factor = $suf eq 'ms'  ? 1000
              : $suf eq 'sec' ? 1
              :                 die("Unknown suffix '$suf'");
   return $num / $factor;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End PgLogParser package
# ###########################################################################

# ###########################################################################
# SlowLogParser package 7522
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/SlowLogParser.pm
#   trunk/common/t/SlowLogParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package SlowLogParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Data::Dumper;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class ) = @_;
   my $self = {
      pending => [],
   };
   return bless $self, $class;
}

my $slow_log_ts_line = qr/^# Time: ([0-9: ]{15})/;
my $slow_log_uh_line = qr/# User\@Host: ([^\[]+|\[[^[]+\]).*?@ (\S*) \[(.*)\]/;
my $slow_log_hd_line = qr{
      ^(?:
      T[cC][pP]\s[pP]ort:\s+\d+ # case differs on windows/unix
      |
      [/A-Z].*mysqld,\sVersion.*(?:started\swith:|embedded\slibrary)
      |
      Time\s+Id\s+Command
      ).*\n
   }xm;

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(next_event tell);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($next_event, $tell) = @args{@required_args};

   my $pending = $self->{pending};
   local $INPUT_RECORD_SEPARATOR = ";\n#";
   my $trimlen    = length($INPUT_RECORD_SEPARATOR);
   my $pos_in_log = $tell->();
   my $stmt;

   EVENT:
   while (
         defined($stmt = shift @$pending)
      or defined($stmt = $next_event->())
   ) {
      my @properties = ('cmd', 'Query', 'pos_in_log', $pos_in_log);
      $pos_in_log = $tell->();

      if ( $stmt =~ s/$slow_log_hd_line//go ){ # Throw away header lines in log
         my @chunks = split(/$INPUT_RECORD_SEPARATOR/o, $stmt);
         if ( @chunks > 1 ) {
            MKDEBUG && _d("Found multiple chunks");
            $stmt = shift @chunks;
            unshift @$pending, @chunks;
         }
      }

      $stmt = '#' . $stmt unless $stmt =~ m/\A#/;
      $stmt =~ s/;\n#?\Z//;


      my ($got_ts, $got_uh, $got_ac, $got_db, $got_set, $got_embed);
      my $pos = 0;
      my $len = length($stmt);
      my $found_arg = 0;
      LINE:
      while ( $stmt =~ m/^(.*)$/mg ) { # /g is important, requires scalar match.
         $pos     = pos($stmt);  # Be careful not to mess this up!
         my $line = $1;          # Necessary for /g and pos() to work.
         MKDEBUG && _d($line);

         if ($line =~ m/^(?:#|use |SET (?:last_insert_id|insert_id|timestamp))/o) {

            if ( !$got_ts && (my ( $time ) = $line =~ m/$slow_log_ts_line/o)) {
               MKDEBUG && _d("Got ts", $time);
               push @properties, 'ts', $time;
               ++$got_ts;
               if ( !$got_uh
                  && ( my ( $user, $host, $ip ) = $line =~ m/$slow_log_uh_line/o )
               ) {
                  MKDEBUG && _d("Got user, host, ip", $user, $host, $ip);
                  push @properties, 'user', $user, 'host', $host, 'ip', $ip;
                  ++$got_uh;
               }
            }

            elsif ( !$got_uh
                  && ( my ( $user, $host, $ip ) = $line =~ m/$slow_log_uh_line/o )
            ) {
               MKDEBUG && _d("Got user, host, ip", $user, $host, $ip);
               push @properties, 'user', $user, 'host', $host, 'ip', $ip;
               ++$got_uh;
            }

            elsif (!$got_ac && $line =~ m/^# (?:administrator command:.*)$/) {
               MKDEBUG && _d("Got admin command");
               $line =~ s/^#\s+//;  # string leading "# ".
               push @properties, 'cmd', 'Admin', 'arg', $line;
               push @properties, 'bytes', length($properties[-1]);
               ++$found_arg;
               ++$got_ac;
            }

            elsif ( $line =~ m/^# +[A-Z][A-Za-z_]+: \S+/ ) { # Make the test cheap!
               MKDEBUG && _d("Got some line with properties");

               if ( $line =~ m/Schema:\s+\w+: / ) {
                  MKDEBUG && _d('Removing empty Schema attrib');
                  $line =~ s/Schema:\s+//;
                  MKDEBUG && _d($line);
               }

               my @temp = $line =~ m/(\w+):\s+(\S+|\Z)/g;
               push @properties, @temp;
            }

            elsif ( !$got_db && (my ( $db ) = $line =~ m/^use ([^;]+)/ ) ) {
               MKDEBUG && _d("Got a default database:", $db);
               push @properties, 'db', $db;
               ++$got_db;
            }

            elsif (!$got_set && (my ($setting) = $line =~ m/^SET\s+([^;]*)/)) {
               MKDEBUG && _d("Got some setting:", $setting);
               push @properties, split(/,|\s*=\s*/, $setting);
               ++$got_set;
            }

            if ( !$found_arg && $pos == $len ) {
               MKDEBUG && _d("Did not find arg, looking for special cases");
               local $INPUT_RECORD_SEPARATOR = ";\n";
               if ( defined(my $l = $next_event->()) ) {
                  chomp $l;
                  $l =~ s/^\s+//;
                  MKDEBUG && _d("Found admin statement", $l);
                  push @properties, 'cmd', 'Admin', 'arg', $l;
                  push @properties, 'bytes', length($properties[-1]);
                  $found_arg++;
               }
               else {
                  MKDEBUG && _d("I can't figure out what to do with this line");
                  next EVENT;
               }
            }
         }
         else {
            MKDEBUG && _d("Got the query/arg line");
            my $arg = substr($stmt, $pos - length($line));
            push @properties, 'arg', $arg, 'bytes', length($arg);
            if ( $args{misc} && $args{misc}->{embed}
               && ( my ($e) = $arg =~ m/($args{misc}->{embed})/)
            ) {
               push @properties, $e =~ m/$args{misc}->{capture}/g;
            }
            last LINE;
         }
      }

      MKDEBUG && _d('Properties of event:', Dumper(\@properties));
      my $event = { @properties };
      if ( $args{stats} ) {
         $args{stats}->{events_read}++;
         $args{stats}->{events_parsed}++;
      }
      return $event;
   } # EVENT

   @$pending = ();
   $args{oktorun}->(0) if $args{oktorun};
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End SlowLogParser package
# ###########################################################################

# ###########################################################################
# SlowLogWriter package 6590
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/SlowLogWriter.pm
#   trunk/common/t/SlowLogWriter.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package SlowLogWriter;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class ) = @_;
   bless {}, $class;
}

sub write {
   my ( $self, $fh, $event ) = @_;
   if ( $event->{ts} ) {
      print $fh "# Time: $event->{ts}\n";
   }
   if ( $event->{user} ) {
      printf $fh "# User\@Host: %s[%s] \@ %s []\n",
         $event->{user}, $event->{user}, $event->{host};
   }
   if ( $event->{ip} && $event->{port} ) {
      printf $fh "# Client: $event->{ip}:$event->{port}\n";
   }
   if ( $event->{Thread_id} ) {
      printf $fh "# Thread_id: $event->{Thread_id}\n";
   }

   my $percona_patched = exists $event->{QC_Hit} ? 1 : 0;

   printf $fh
      "# Query_time: %.6f  Lock_time: %.6f  Rows_sent: %d  Rows_examined: %d\n",
      map { $_ || 0 }
         @{$event}{qw(Query_time Lock_time Rows_sent Rows_examined)};

   if ( $percona_patched ) {
      printf $fh
         "# QC_Hit: %s  Full_scan: %s  Full_join: %s  Tmp_table: %s  Disk_tmp_table: %s\n# Filesort: %s  Disk_filesort: %s  Merge_passes: %d\n",
         map { $_ || 0 }
            @{$event}{qw(QC_Hit Full_scan Full_join Tmp_table Disk_tmp_table Filesort Disk_filesort Merge_passes)};

      if ( exists $event->{InnoDB_IO_r_ops} ) {
         printf $fh
            "#   InnoDB_IO_r_ops: %d  InnoDB_IO_r_bytes: %d  InnoDB_IO_r_wait: %s\n#   InnoDB_rec_lock_wait: %s  InnoDB_queue_wait: %s\n#   InnoDB_pages_distinct: %d\n",
            map { $_ || 0 }
               @{$event}{qw(InnoDB_IO_r_ops InnoDB_IO_r_bytes InnoDB_IO_r_wait InnoDB_rec_lock_wait InnoDB_queue_wait InnoDB_pages_distinct)};

      } 
      else {
         printf $fh "# No InnoDB statistics available for this query\n";
      }
   }

   if ( $event->{db} ) {
      printf $fh "use %s;\n", $event->{db};
   }
   if ( $event->{arg} =~ m/^administrator command/ ) {
      print $fh '# ';
   }
   print $fh $event->{arg}, ";\n";

   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End SlowLogWriter package
# ###########################################################################

# ###########################################################################
# EventAggregator package 7272
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/EventAggregator.pm
#   trunk/common/t/EventAggregator.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package EventAggregator;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use List::Util qw(min max);
use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG         => $ENV{MKDEBUG} || 0;
use constant BUCK_SIZE       => 1.05;
use constant BASE_LOG        => log(BUCK_SIZE);
use constant BASE_OFFSET     => abs(1 - log(0.000001) / BASE_LOG); # 284.1617969
use constant NUM_BUCK        => 1000;
use constant MIN_BUCK        => .000001;
use constant MAX_UNQ_STRINGS => 1_000;

my @buck_vals = map { bucket_value($_); } (0..NUM_BUCK-1);

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(groupby worst) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $attributes = $args{attributes} || {};
   my $self = {
      groupby        => $args{groupby},
      detect_attribs => scalar keys %$attributes == 0 ? 1 : 0,
      all_attribs    => [ keys %$attributes ],
      ignore_attribs => {
         map  { $_ => $args{attributes}->{$_} }
         grep { $_ ne $args{groupby} }
         @{$args{ignore_attributes}}
      },
      attributes     => {
         map  { $_ => $args{attributes}->{$_} }
         grep { $_ ne $args{groupby} }
         keys %$attributes
      },
      alt_attribs    => {
         map  { $_ => make_alt_attrib(@{$args{attributes}->{$_}}) }
         grep { $_ ne $args{groupby} }
         keys %$attributes
      },
      worst          => $args{worst},
      unroll_limit   => $args{unroll_limit} || 1000,
      attrib_limit   => $args{attrib_limit},
      result_classes => {},
      result_globals => {},
      result_samples => {},
      class_metrics  => {},
      global_metrics => {},
      n_events       => 0,
      unrolled_loops => undef,
      type_for       => { %{$args{type_for} || { Query_time => 'num' }} },
   };
   return bless $self, $class;
}

sub reset_aggregated_data {
   my ( $self ) = @_;
   foreach my $class ( values %{$self->{result_classes}} ) {
      foreach my $attrib ( values %$class ) {
         delete @{$attrib}{keys %$attrib};
      }
   }
   foreach my $class ( values %{$self->{result_globals}} ) {
      delete @{$class}{keys %$class};
   }
   delete @{$self->{result_samples}}{keys %{$self->{result_samples}}};
   $self->{n_events} = 0;
}

sub aggregate {
   my ( $self, $event ) = @_;

   my $group_by = $event->{$self->{groupby}};
   return unless defined $group_by;

   $self->{n_events}++;
   MKDEBUG && _d('Event', $self->{n_events});

   return $self->{unrolled_loops}->($self, $event, $group_by)
      if $self->{unrolled_loops};

   if ( $self->{n_events} <= $self->{unroll_limit} ) {

      $self->add_new_attributes($event) if $self->{detect_attribs};

      ATTRIB:
      foreach my $attrib ( keys %{$self->{attributes}} ) {

         if ( !exists $event->{$attrib} ) {
            MKDEBUG && _d("attrib doesn't exist in event:", $attrib);
            my $alt_attrib = $self->{alt_attribs}->{$attrib}->($event);
            MKDEBUG && _d('alt attrib:', $alt_attrib);
            next ATTRIB unless $alt_attrib;
         }

         GROUPBY:
         foreach my $val ( ref $group_by ? @$group_by : ($group_by) ) {
            my $class_attrib  = $self->{result_classes}->{$val}->{$attrib} ||= {};
            my $global_attrib = $self->{result_globals}->{$attrib} ||= {};
            my $samples       = $self->{result_samples};
            my $handler = $self->{handlers}->{ $attrib };
            if ( !$handler ) {
               $handler = $self->make_handler(
                  event      => $event,
                  attribute  => $attrib,
                  alternates => $self->{attributes}->{$attrib},
                  worst      => $self->{worst} eq $attrib,
               );
               $self->{handlers}->{$attrib} = $handler;
            }
            next GROUPBY unless $handler;
            $samples->{$val} ||= $event; # Initialize to the first event.
            $handler->($event, $class_attrib, $global_attrib, $samples, $group_by);
         }
      }
   }
   else {
      $self->_make_unrolled_loops($event);
      $self->{unrolled_loops}->($self, $event, $group_by);
   }

   return;
}

sub _make_unrolled_loops {
   my ( $self, $event ) = @_;

   my $group_by = $event->{$self->{groupby}};

   my @attrs   = grep { $self->{handlers}->{$_} } keys %{$self->{attributes}};
   my $globs   = $self->{result_globals}; # Global stats for each
   my $samples = $self->{result_samples};

   my @lines = (
      'my ( $self, $event, $group_by ) = @_;',
      'my ($val, $class, $global, $idx);',
      (ref $group_by ? ('foreach my $group_by ( @$group_by ) {') : ()),
      'my $temp = $self->{result_classes}->{ $group_by }
         ||= { map { $_ => { } } @attrs };',
      '$samples->{$group_by} ||= $event;', # Always start with the first.
   );
   foreach my $i ( 0 .. $#attrs ) {
      push @lines, (
         '$class  = $temp->{\''  . $attrs[$i] . '\'};',
         '$global = $globs->{\'' . $attrs[$i] . '\'};',
         $self->{unrolled_for}->{$attrs[$i]},
      );
   }
   if ( ref $group_by ) {
      push @lines, '}'; # Close the loop opened above
   }
   @lines = map { s/^/   /gm; $_ } @lines; # Indent for debugging
   unshift @lines, 'sub {';
   push @lines, '}';

   my $code = join("\n", @lines);
   MKDEBUG && _d('Unrolled subroutine:', @lines);
   my $sub = eval $code;
   die $EVAL_ERROR if $EVAL_ERROR;
   $self->{unrolled_loops} = $sub;

   return;
}

sub results {
   my ( $self ) = @_;
   return {
      classes => $self->{result_classes},
      globals => $self->{result_globals},
      samples => $self->{result_samples},
   };
}

sub set_results {
   my ( $self, $results ) = @_;
   $self->{result_classes} = $results->{classes};
   $self->{result_globals} = $results->{globals};
   $self->{result_samples} = $results->{samples};
   return;
}

sub stats {
   my ( $self ) = @_;
   return {
      classes => $self->{class_metrics},
      globals => $self->{global_metrics},
   };
}

sub attributes {
   my ( $self ) = @_;
   return $self->{type_for};
}

sub set_attribute_types {
   my ( $self, $attrib_types ) = @_;
   $self->{type_for} = $attrib_types;
   return;
}

sub type_for {
   my ( $self, $attrib ) = @_;
   return $self->{type_for}->{$attrib};
}

sub make_handler {
   my ( $self, %args ) = @_;
   my @required_args = qw(event attribute);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($event, $attrib) = @args{@required_args};

   my $val;
   eval { $val= $self->_get_value(%args); };
   if ( $EVAL_ERROR ) {
      MKDEBUG && _d("Cannot make", $attrib, "handler:", $EVAL_ERROR);
      return;
   }
   return unless defined $val; # can't determine type if it's undef

   my $float_re = qr{[+-]?(?:(?=\d|[.])\d+(?:[.])\d{0,})(?:E[+-]?\d+)?}i;
   my $type = $self->type_for($attrib)           ? $self->type_for($attrib)
            : $attrib =~ m/_crc$/                ? 'string'
            : $val    =~ m/^(?:\d+|$float_re)$/o ? 'num'
            : $val    =~ m/^(?:Yes|No)$/         ? 'bool'
            :                                      'string';
   MKDEBUG && _d('Type for', $attrib, 'is', $type, '(sample:', $val, ')');
   $self->{type_for}->{$attrib} = $type;

   my @lines;

   my %track = (
      sum => $type =~ m/num|bool/    ? 1 : 0,  # sum of values
      unq => $type =~ m/bool|string/ ? 1 : 0,  # count of unique values seen
      all => $type eq 'num'          ? 1 : 0,  # all values in bucketed list
   );

   my $trf = ($type eq 'bool') ? q{(($val || '') eq 'Yes') ? 1 : 0}
           :                     undef;
   if ( $trf ) {
      push @lines, q{$val = } . $trf . ';';
   }

   if ( $attrib eq 'Query_time' ) {
      push @lines, (
         '$val =~ s/^(\d+(?:\.\d+)?).*/$1/;',
         '$event->{\''.$attrib.'\'} = $val;',
      );
   }

   if ( $type eq 'num' && $self->{attrib_limit} ) {
      push @lines, (
         "if ( \$val > $self->{attrib_limit} ) {",
         '   $val = $class->{last} ||= 0;',
         '}',
         '$class->{last} = $val;',
      );
   }

   my $lt = $type eq 'num' ? '<' : 'lt';
   my $gt = $type eq 'num' ? '>' : 'gt';
   foreach my $place ( qw($class $global) ) {
      my @tmp;  # hold lines until PLACE placeholder is replaced

      push @tmp, '++PLACE->{cnt};';  # count of all values seen

      if ( $attrib =~ m/_crc$/ ) {
         push @tmp, '$val = $val % 1_000;';
      }

      push @tmp, (
         'PLACE->{min} = $val if !defined PLACE->{min} || $val '
            . $lt . ' PLACE->{min};',
      );
      push @tmp, (
         'PLACE->{max} = $val if !defined PLACE->{max} || $val '
         . $gt . ' PLACE->{max};',
      );
      if ( $track{sum} ) {
         push @tmp, 'PLACE->{sum} += $val;';
      }

      if ( $track{all} ) {
         push @tmp, (
            'exists PLACE->{all} or PLACE->{all} = {};',
            '++PLACE->{all}->{ EventAggregator::bucket_idx($val) };',
         );
      }

      push @lines, map { s/PLACE/$place/g; $_ } @tmp;
   }

   if ( $track{unq} ) {
      push @lines, '++$class->{unq}->{$val}';
   }

   if ( $args{worst} ) {
      my $op = $type eq 'num' ? '>=' : 'ge';
      push @lines, (
         'if ( $val ' . $op . ' ($class->{max} || 0) ) {',
         '   $samples->{$group_by} = $event;',
         '}',
      );
   }

   my @unrolled = (
      "\$val = \$event->{'$attrib'};", 
      
      ( map  { "\$val = \$event->{'$_'} unless defined \$val;" }
        grep { $_ ne $attrib } @{$args{alternates}}
      ),
      
      'defined $val && do {',
         @lines,
      '};',
   );
   $self->{unrolled_for}->{$attrib} = join("\n", @unrolled);

   my @code = (
      'sub {',
         'my ( $event, $class, $global, $samples, $group_by ) = @_;',
         'my ($val, $idx);',

         $self->{unrolled_for}->{$attrib},

         'return;',
      '}',
   );
   $self->{code_for}->{$attrib} = join("\n", @code);
   MKDEBUG && _d($attrib, 'handler code:', $self->{code_for}->{$attrib});
   my $sub = eval $self->{code_for}->{$attrib};
   if ( $EVAL_ERROR ) {
      die "Failed to compile $attrib handler code: $EVAL_ERROR";
   }

   return $sub;
}

sub bucket_idx {
   my ( $val ) = @_;
   return 0 if $val < MIN_BUCK;
   my $idx = int(BASE_OFFSET + log($val)/BASE_LOG);
   return $idx > (NUM_BUCK-1) ? (NUM_BUCK-1) : $idx;
}

sub bucket_value {
   my ( $bucket ) = @_;
   return 0 if $bucket == 0;
   die "Invalid bucket: $bucket" if $bucket < 0 || $bucket > (NUM_BUCK-1);
   return (BUCK_SIZE**($bucket-1)) * MIN_BUCK;
}

{
   my @buck_tens;
   sub buckets_of {
      return @buck_tens if @buck_tens;

      my $start_bucket  = 0;
      my @base10_starts = (0);
      map { push @base10_starts, (10**$_)*MIN_BUCK } (1..7);

      for my $base10_bucket ( 0..($#base10_starts-1) ) {
         my $next_bucket = bucket_idx( $base10_starts[$base10_bucket+1] );
         MKDEBUG && _d('Base 10 bucket', $base10_bucket, 'maps to',
            'base 1.05 buckets', $start_bucket, '..', $next_bucket-1);
         for my $base1_05_bucket ($start_bucket..($next_bucket-1)) {
            $buck_tens[$base1_05_bucket] = $base10_bucket;
         }
         $start_bucket = $next_bucket;
      }

      map { $buck_tens[$_] = 7 } ($start_bucket..(NUM_BUCK-1));

      return @buck_tens;
   }
}

sub calculate_statistical_metrics {
   my ( $self, %args ) = @_;
   my $classes        = $self->{result_classes};
   my $globals        = $self->{result_globals};
   my $class_metrics  = $self->{class_metrics};
   my $global_metrics = $self->{global_metrics};
   MKDEBUG && _d('Calculating statistical_metrics');
   foreach my $attrib ( keys %$globals ) {
      if ( exists $globals->{$attrib}->{all} ) {
         $global_metrics->{$attrib}
            = $self->_calc_metrics(
               $globals->{$attrib}->{all},
               $globals->{$attrib},
            );
      }

      foreach my $class ( keys %$classes ) {
         if ( exists $classes->{$class}->{$attrib}->{all} ) {
            $class_metrics->{$class}->{$attrib}
               = $self->_calc_metrics(
                  $classes->{$class}->{$attrib}->{all},
                  $classes->{$class}->{$attrib}
               );

            if ( $args{apdex_t} && $attrib eq 'Query_time' ) {
               $class_metrics->{$class}->{$attrib}->{apdex_t} = $args{apdex_t};
               $class_metrics->{$class}->{$attrib}->{apdex}
                  = $self->calculate_apdex(
                     t       => $args{apdex_t},
                     samples => $classes->{$class}->{$attrib}->{all},
                  );
            }
         }
      }
   }

   return;
}

sub _calc_metrics {
   my ( $self, $vals, $args ) = @_;
   my $statistical_metrics = {
      pct_95    => 0,
      stddev    => 0,
      median    => 0,
      cutoff    => undef,
   };

   return $statistical_metrics
      unless defined $vals && %$vals && $args->{cnt};

   my $n_vals = $args->{cnt};
   if ( $n_vals == 1 || $args->{max} == $args->{min} ) {
      my $v      = $args->{max} || 0;
      my $bucket = int(6 + ( log($v > 0 ? $v : MIN_BUCK) / log(10)));
      $bucket    = $bucket > 7 ? 7 : $bucket < 0 ? 0 : $bucket;
      return {
         pct_95 => $v,
         stddev => 0,
         median => $v,
         cutoff => $n_vals,
      };
   }
   elsif ( $n_vals == 2 ) {
      foreach my $v ( $args->{min}, $args->{max} ) {
         my $bucket = int(6 + ( log($v && $v > 0 ? $v : MIN_BUCK) / log(10)));
         $bucket = $bucket > 7 ? 7 : $bucket < 0 ? 0 : $bucket;
      }
      my $v      = $args->{max} || 0;
      my $mean = (($args->{min} || 0) + $v) / 2;
      return {
         pct_95 => $v,
         stddev => sqrt((($v - $mean) ** 2) *2),
         median => $mean,
         cutoff => $n_vals,
      };
   }

   my $cutoff = $n_vals >= 10 ? int ( $n_vals * 0.95 ) : $n_vals;
   $statistical_metrics->{cutoff} = $cutoff;

   my $total_left = $n_vals;
   my $top_vals   = $n_vals - $cutoff; # vals > 95th
   my $sum_excl   = 0;
   my $sum        = 0;
   my $sumsq      = 0;
   my $mid        = int($n_vals / 2);
   my $median     = 0;
   my $prev       = NUM_BUCK-1; # Used for getting median when $cutoff is odd
   my $bucket_95  = 0; # top bucket in 95th

   MKDEBUG && _d('total vals:', $total_left, 'top vals:', $top_vals, 'mid:', $mid);

   my @buckets = map { 0 } (0..NUM_BUCK-1);
   map { $buckets[$_] = $vals->{$_} } keys %$vals;
   $vals = \@buckets;  # repoint vals from given hashref to our array

   BUCKET:
   for my $bucket ( reverse 0..(NUM_BUCK-1) ) {
      my $val = $vals->[$bucket];
      next BUCKET unless $val; 

      $total_left -= $val;
      $sum_excl   += $val;
      $bucket_95   = $bucket if !$bucket_95 && $sum_excl > $top_vals;

      if ( !$median && $total_left <= $mid ) {
         $median = (($cutoff % 2) || ($val > 1)) ? $buck_vals[$bucket]
                 : ($buck_vals[$bucket] + $buck_vals[$prev]) / 2;
      }

      $sum    += $val * $buck_vals[$bucket];
      $sumsq  += $val * ($buck_vals[$bucket]**2);
      $prev   =  $bucket;
   }

   my $var      = $sumsq/$n_vals - ( ($sum/$n_vals) ** 2 );
   my $stddev   = $var > 0 ? sqrt($var) : 0;
   my $maxstdev = (($args->{max} || 0) - ($args->{min} || 0)) / 2;
   $stddev      = $stddev > $maxstdev ? $maxstdev : $stddev;

   MKDEBUG && _d('sum:', $sum, 'sumsq:', $sumsq, 'stddev:', $stddev,
      'median:', $median, 'prev bucket:', $prev,
      'total left:', $total_left, 'sum excl', $sum_excl,
      'bucket 95:', $bucket_95, $buck_vals[$bucket_95]);

   $statistical_metrics->{stddev} = $stddev;
   $statistical_metrics->{pct_95} = $buck_vals[$bucket_95];
   $statistical_metrics->{median} = $median;

   return $statistical_metrics;
}

sub metrics {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(attrib where) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $attrib = $args{attrib};
   my $where   = $args{where};

   my $stats      = $self->results();
   my $metrics    = $self->stats();
   my $store      = $stats->{classes}->{$where}->{$attrib};
   my $global_cnt = $stats->{globals}->{$attrib}->{cnt};

   return {
      cnt    => $store->{cnt},
      pct    => $global_cnt && $store->{cnt} ? $store->{cnt} / $global_cnt : 0,
      sum    => $store->{sum},
      min    => $store->{min},
      max    => $store->{max},
      avg    => $store->{sum} && $store->{cnt} ? $store->{sum} / $store->{cnt} : 0,
      median => $metrics->{classes}->{$where}->{$attrib}->{median} || 0,
      pct_95 => $metrics->{classes}->{$where}->{$attrib}->{pct_95} || 0,
      stddev => $metrics->{classes}->{$where}->{$attrib}->{stddev} || 0,

      apdex_t => $metrics->{classes}->{$where}->{$attrib}->{apdex_t},
      apdex   => $metrics->{classes}->{$where}->{$attrib}->{apdex},
   };
}

sub top_events {
   my ( $self, %args ) = @_;
   my $classes = $self->{result_classes};
   my @sorted = reverse sort { # Sorted list of $groupby values
      $classes->{$a}->{$args{attrib}}->{$args{orderby}}
         <=> $classes->{$b}->{$args{attrib}}->{$args{orderby}}
      } grep {
         defined $classes->{$_}->{$args{attrib}}->{$args{orderby}}
      } keys %$classes;
   my @chosen;  # top events
   my @other;   # other events (< top)
   my ($total, $count) = (0, 0);
   foreach my $groupby ( @sorted ) {
      if ( 
         (!$args{total} || $total < $args{total} )
         && ( !$args{count} || $count < $args{count} )
      ) {
         push @chosen, [$groupby, 'top', $count+1];
      }

      elsif ( $args{ol_attrib} && (!$args{ol_freq}
         || $classes->{$groupby}->{$args{ol_attrib}}->{cnt} >= $args{ol_freq})
      ) {
         my $stats = $self->{class_metrics}->{$groupby}->{$args{ol_attrib}};
         if ( ($stats->{pct_95} || 0) >= $args{ol_limit} ) {
            push @chosen, [$groupby, 'outlier', $count+1];
         }
         else {
            push @other, [$groupby, 'misc', $count+1];
         }
      }

      else {
         push @other, [$groupby, 'misc', $count+1];
      }

      $total += $classes->{$groupby}->{$args{attrib}}->{$args{orderby}};
      $count++;
   }
   return \@chosen, \@other;
}

sub add_new_attributes {
   my ( $self, $event ) = @_;
   return unless $event;

   map {
      my $attrib = $_;
      $self->{attributes}->{$attrib}  = [$attrib];
      $self->{alt_attribs}->{$attrib} = make_alt_attrib($attrib);
      push @{$self->{all_attribs}}, $attrib;
      MKDEBUG && _d('Added new attribute:', $attrib);
   }
   grep {
      $_ ne $self->{groupby}
      && !exists $self->{attributes}->{$_}
      && !exists $self->{ignore_attribs}->{$_}
   }
   keys %$event;

   return;
}

sub get_attributes {
   my ( $self ) = @_;
   return $self->{all_attribs};
}

sub events_processed {
   my ( $self ) = @_;
   return $self->{n_events};
}

sub make_alt_attrib {
   my ( @attribs ) = @_;

   my $attrib = shift @attribs;  # Primary attribute.
   return sub {} unless @attribs;  # No alternates.

   my @lines;
   push @lines, 'sub { my ( $event ) = @_; my $alt_attrib;';
   push @lines, map  {
         "\$alt_attrib = '$_' if !defined \$alt_attrib "
         . "&& exists \$event->{'$_'};"
      } @attribs;
   push @lines, 'return $alt_attrib; }';
   MKDEBUG && _d('alt attrib sub for', $attrib, ':', @lines);
   my $sub = eval join("\n", @lines);
   die if $EVAL_ERROR;
   return $sub;
}

sub merge {
   my ( @ea_objs ) = @_;
   MKDEBUG && _d('Merging', scalar @ea_objs, 'ea');
   return unless scalar @ea_objs;

   my $ea1   = shift @ea_objs;
   my $r1    = $ea1->results;
   my $worst = $ea1->{worst};  # for merging, finding worst sample

   my %attrib_types = %{ $ea1->attributes() };

   foreach my $ea ( @ea_objs ) {
      die "EventAggregator objects have different groupby: "
         . "$ea1->{groupby} and $ea->{groupby}"
         unless $ea1->{groupby} eq $ea->{groupby};
      die "EventAggregator objects have different worst: "
         . "$ea1->{worst} and $ea->{worst}"
         unless $ea1->{worst} eq $ea->{worst};
      
      my $attrib_types = $ea->attributes();
      map {
         $attrib_types{$_} = $attrib_types->{$_}
            unless exists $attrib_types{$_};
      } keys %$attrib_types;
   }

   my $r_merged = {
      classes => {},
      globals => _deep_copy_attribs($r1->{globals}),
      samples => {},
   };
   map {
      $r_merged->{classes}->{$_}
         = _deep_copy_attribs($r1->{classes}->{$_});

      @{$r_merged->{samples}->{$_}}{keys %{$r1->{samples}->{$_}}}
         = values %{$r1->{samples}->{$_}};
   } keys %{$r1->{classes}};

   for my $i ( 0..$#ea_objs ) {
      MKDEBUG && _d('Merging ea obj', ($i + 1));
      my $r2 = $ea_objs[$i]->results;

      eval {
         CLASS:
         foreach my $class ( keys %{$r2->{classes}} ) {
            my $r1_class = $r_merged->{classes}->{$class};
            my $r2_class = $r2->{classes}->{$class};

            if ( $r1_class && $r2_class ) {
               CLASS_ATTRIB:
               foreach my $attrib ( keys %$r2_class ) {
                  MKDEBUG && _d('merge', $attrib);
                  if ( $r1_class->{$attrib} && $r2_class->{$attrib} ) {
                     _add_attrib_vals($r1_class->{$attrib}, $r2_class->{$attrib});
                  }
                  elsif ( !$r1_class->{$attrib} ) {
                  MKDEBUG && _d('copy', $attrib);
                     $r1_class->{$attrib} =
                        _deep_copy_attrib_vals($r2_class->{$attrib})
                  }
               }
            }
            elsif ( !$r1_class ) {
               MKDEBUG && _d('copy class');
               $r_merged->{classes}->{$class} = _deep_copy_attribs($r2_class);
            }

            my $new_worst_sample;
            if ( $r_merged->{samples}->{$class} && $r2->{samples}->{$class} ) {
               if (   $r2->{samples}->{$class}->{$worst}
                    > $r_merged->{samples}->{$class}->{$worst} ) {
                  $new_worst_sample = $r2->{samples}->{$class}
               }
            }
            elsif ( !$r_merged->{samples}->{$class} ) {
               $new_worst_sample = $r2->{samples}->{$class};
            }
            if ( $new_worst_sample ) {
               MKDEBUG && _d('New worst sample:', $worst, '=',
                  $new_worst_sample->{$worst}, 'item:', substr($class, 0, 100));
               my %new_sample;
               @new_sample{keys %$new_worst_sample}
                  = values %$new_worst_sample;
               $r_merged->{samples}->{$class} = \%new_sample;
            }
         }
      };
      if ( $EVAL_ERROR ) {
         warn "Error merging class/sample: $EVAL_ERROR";
      }

      eval {
         GLOBAL_ATTRIB:
         MKDEBUG && _d('Merging global attributes');
         foreach my $attrib ( keys %{$r2->{globals}} ) {
            my $r1_global = $r_merged->{globals}->{$attrib};
            my $r2_global = $r2->{globals}->{$attrib};

            if ( $r1_global && $r2_global ) {
               MKDEBUG && _d('merge', $attrib);
               _add_attrib_vals($r1_global, $r2_global);
            }
            elsif ( !$r1_global ) {
               MKDEBUG && _d('copy', $attrib);
               $r_merged->{globals}->{$attrib}
                  = _deep_copy_attrib_vals($r2_global);
            }
         }
      };
      if ( $EVAL_ERROR ) {
         warn "Error merging globals: $EVAL_ERROR";
      }
   }

   my $ea_merged = new EventAggregator(
      groupby    => $ea1->{groupby},
      worst      => $ea1->{worst},
      attributes => { map { $_=>[$_] } keys %attrib_types },
   );
   $ea_merged->set_results($r_merged);
   $ea_merged->set_attribute_types(\%attrib_types);
   return $ea_merged;
}

sub _add_attrib_vals {
   my ( $vals1, $vals2 ) = @_;

   foreach my $val ( keys %$vals1 ) {
      my $val1 = $vals1->{$val};
      my $val2 = $vals2->{$val};

      if ( (!ref $val1) && (!ref $val2) ) {
         die "undefined $val value" unless defined $val1 && defined $val2;

         my $is_num = exists $vals1->{sum} ? 1 : 0;
         if ( $val eq 'max' ) {
            if ( $is_num ) {
               $vals1->{$val} = $val1 > $val2  ? $val1 : $val2;
            }
            else {
               $vals1->{$val} = $val1 gt $val2 ? $val1 : $val2;
            }
         }
         elsif ( $val eq 'min' ) {
            if ( $is_num ) {
               $vals1->{$val} = $val1 < $val2  ? $val1 : $val2;
            }
            else {
               $vals1->{$val} = $val1 lt $val2 ? $val1 : $val2;
            }
         }
         else {
            $vals1->{$val} += $val2;
         }
      }
      elsif ( (ref $val1 eq 'ARRAY') && (ref $val2 eq 'ARRAY') ) {
         die "Empty $val arrayref" unless @$val1 && @$val2;
         my $n_buckets = (scalar @$val1) - 1;
         for my $i ( 0..$n_buckets ) {
            $vals1->{$val}->[$i] += $val2->[$i];
         }
      }
      elsif ( (ref $val1 eq 'HASH')  && (ref $val2 eq 'HASH')  ) {
         die "Empty $val hashref" unless %$val1 and %$val2;
         map { $vals1->{$val}->{$_} += $val2->{$_} } keys %$val2;
      }
      else {
         MKDEBUG && _d('vals1:', Dumper($vals1));
         MKDEBUG && _d('vals2:', Dumper($vals2));
         die "$val type mismatch";
      }
   }

   return;
}

sub _deep_copy_attribs {
   my ( $attribs ) = @_;
   my $copy = {};
   foreach my $attrib ( keys %$attribs ) {
      $copy->{$attrib} = _deep_copy_attrib_vals($attribs->{$attrib});
   }
   return $copy;
}

sub _deep_copy_attrib_vals {
   my ( $vals ) = @_;
   my $copy;
   if ( ref $vals eq 'HASH' ) {
      $copy = {};
      foreach my $val ( keys %$vals ) {
         if ( my $ref_type = ref $val ) {
            if ( $ref_type eq 'ARRAY' ) {
               my $n_elems = (scalar @$val) - 1;
               $copy->{$val} = [ map { undef } ( 0..$n_elems ) ];
               for my $i ( 0..$n_elems ) {
                  $copy->{$val}->[$i] = $vals->{$val}->[$i];
               }
            }
            elsif ( $ref_type eq 'HASH' ) {
               $copy->{$val} = {};
               map { $copy->{$val}->{$_} += $vals->{$val}->{$_} }
                  keys %{$vals->{$val}}
            }
            else {
               die "I don't know how to deep copy a $ref_type reference";
            }
         }
         else {
            $copy->{$val} = $vals->{$val};
         }
      }
   }
   else {
      $copy = $vals;
   }
   return $copy;
}

sub calculate_apdex {
   my ( $self, %args ) = @_;
   my @required_args = qw(t samples);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($t, $samples) = @args{@required_args};

   if ( $t <= 0 ) {
      die "Invalid target threshold (T): $t.  T must be greater than zero";
   }

   my $f = 4 * $t;
   MKDEBUG && _d("Apdex T =", $t, "F =", $f);

   my $satisfied  = 0;
   my $tolerating = 0;
   my $frustrated = 0;  # just for debug output
   my $n_samples  = 0;
   BUCKET:
   for my $bucket ( keys %$samples ) {
      my $n_responses   = $samples->{$bucket};
      my $response_time = $buck_vals[$bucket];

      if ( $response_time <= $t ) {
         $satisfied += $n_responses;
      }
      elsif ( $response_time <= $f ) {
         $tolerating += $n_responses;
      }
      else {
         $frustrated += $n_responses;
      }

      $n_samples += $n_responses;
   }

   my $apdex = sprintf('%.2f', ($satisfied + ($tolerating / 2)) / $n_samples);
   MKDEBUG && _d($n_samples, "samples,", $satisfied, "satisfied,",
      $tolerating, "tolerating,", $frustrated, "frustrated, Apdex score:",
      $apdex);

   return $apdex;
}

sub _get_value {
   my ( $self, %args ) = @_;
   my ($event, $attrib, $alts) = @args{qw(event attribute alternates)};
   return unless $event && $attrib;

   my $value;
   if ( exists $event->{$attrib} ) {
      $value = $event->{$attrib};
   }
   elsif ( $alts ) {
      my $found_value = 0;
      foreach my $alt_attrib( @$alts ) {
         if ( exists $event->{$alt_attrib} ) {
            $value       = $event->{$alt_attrib};
            $found_value = 1;
            last;
         }
      }
      die "Event does not have attribute $attrib or any of its alternates"
         unless $found_value;
   }
   else {
      die "Event does not have attribute $attrib and there are no alterantes";
   }

   return $value;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End EventAggregator package
# ###########################################################################

# ###########################################################################
# ReportFormatter package 7473
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/ReportFormatter.pm
#   trunk/common/t/ReportFormatter.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package ReportFormatter;


use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use List::Util qw(min max);
use POSIX qw(ceil);

eval { require Term::ReadKey };
my $have_term = $EVAL_ERROR ? 0 : 1;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my @required_args = qw();
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $self = {
      underline_header     => 1,
      line_prefix          => '# ',
      line_width           => 78,
      column_spacing       => ' ',
      extend_right         => 0,
      truncate_line_mark   => '...',
      column_errors        => 'warn',
      truncate_header_side => 'left',
      strip_whitespace     => 1,
      %args,              # args above can be overriden, args below cannot
      n_cols              => 0,
   };

   if ( ($self->{line_width} || '') eq 'auto' ) {
      die "Cannot auto-detect line width because the Term::ReadKey module "
         . "is not installed" unless $have_term;
      ($self->{line_width}) = GetTerminalSize();
   }
   MKDEBUG && _d('Line width:', $self->{line_width});

   return bless $self, $class;
}

sub set_title {
   my ( $self, $title ) = @_;
   $self->{title} = $title;
   return;
}

sub set_columns {
   my ( $self, @cols ) = @_;
   my $min_hdr_wid = 0;  # check that header fits on line
   my $used_width  = 0;
   my @auto_width_cols;

   for my $i ( 0..$#cols ) {
      my $col      = $cols[$i];
      my $col_name = $col->{name};
      my $col_len  = length $col_name;
      die "Column does not have a name" unless defined $col_name;

      if ( $col->{width} ) {
         $col->{width_pct} = ceil(($col->{width} * 100) / $self->{line_width});
         MKDEBUG && _d('col:', $col_name, 'width:', $col->{width}, 'chars =',
            $col->{width_pct}, '%');
      }

      if ( $col->{width_pct} ) {
         $used_width += $col->{width_pct};
      }
      else {
         MKDEBUG && _d('Auto width col:', $col_name);
         $col->{auto_width} = 1;
         push @auto_width_cols, $i;
      }

      $col->{truncate}        = 1 unless defined $col->{truncate};
      $col->{truncate_mark}   = '...' unless defined $col->{truncate_mark};
      $col->{truncate_side} ||= 'right';
      $col->{undef_value}     = '' unless defined $col->{undef_value};

      $col->{min_val} = 0;
      $col->{max_val} = 0;

      $min_hdr_wid        += $col_len;
      $col->{header_width} = $col_len;

      $col->{right_most} = 1 if $i == $#cols;

      push @{$self->{cols}}, $col;
   }

   $self->{n_cols} = scalar @cols;

   if ( ($used_width || 0) > 100 ) {
      die "Total width_pct for all columns is >100%";
   }

   if ( @auto_width_cols ) {
      my $wid_per_col = int((100 - $used_width) / scalar @auto_width_cols);
      MKDEBUG && _d('Line width left:', (100-$used_width), '%;',
         'each auto width col:', $wid_per_col, '%');
      map { $self->{cols}->[$_]->{width_pct} = $wid_per_col } @auto_width_cols;
   }

   $min_hdr_wid += ($self->{n_cols} - 1) * length $self->{column_spacing};
   MKDEBUG && _d('min header width:', $min_hdr_wid);
   if ( $min_hdr_wid > $self->{line_width} ) {
      MKDEBUG && _d('Will truncate headers because min header width',
         $min_hdr_wid, '> line width', $self->{line_width});
      $self->{truncate_headers} = 1;
   }

   return;
}

sub add_line {
   my ( $self, @vals ) = @_;
   my $n_vals = scalar @vals;
   if ( $n_vals != $self->{n_cols} ) {
      $self->_column_error("Number of values $n_vals does not match "
         . "number of columns $self->{n_cols}");
   }
   for my $i ( 0..($n_vals-1) ) {
      my $col   = $self->{cols}->[$i];
      my $val   = defined $vals[$i] ? $vals[$i] : $col->{undef_value};
      if ( $self->{strip_whitespace} ) {
         $val =~ s/^\s+//g;
         $val =~ s/\s+$//;
         $vals[$i] = $val;
      }
      my $width = length $val;
      $col->{min_val} = min($width, ($col->{min_val} || $width));
      $col->{max_val} = max($width, ($col->{max_val} || $width));
   }
   push @{$self->{lines}}, \@vals;
   return;
}

sub get_report {
   my ( $self, %args ) = @_;

   $self->_calculate_column_widths();
   $self->_truncate_headers() if $self->{truncate_headers};
   $self->_truncate_line_values(%args);

   my @col_fmts = $self->_make_column_formats();
   my $fmt      = ($self->{line_prefix} || '')
                . join($self->{column_spacing}, @col_fmts);
   MKDEBUG && _d('Format:', $fmt);

   (my $hdr_fmt = $fmt) =~ s/%([^-])/%-$1/g;

   my @lines;
   push @lines, sprintf "$self->{line_prefix}$self->{title}" if $self->{title};
   push @lines, $self->_truncate_line(
         sprintf($hdr_fmt, map { $_->{name} } @{$self->{cols}}),
         strip => 1,
         mark  => '',
   );

   if ( $self->{underline_header} ) {
      my @underlines = map { '=' x $_->{print_width} } @{$self->{cols}};
      push @lines, $self->_truncate_line(
         sprintf($fmt, @underlines),
         mark  => '',
      );
   }

   push @lines, map {
      my $vals = $_;
      my $i    = 0;
      my @vals = map {
            defined $_ ? $_ : $self->{cols}->[$i++]->{undef_value}
      } @$vals;
      my $line = sprintf($fmt, @vals);
      if ( $self->{extend_right} ) {
         $line;
      }
      else {
         $self->_truncate_line($line);
      }
   } @{$self->{lines}};

   return join("\n", @lines) . "\n";
}

sub truncate_value {
   my ( $self, $col, $val, $width, $side ) = @_;
   return $val if length $val <= $width;
   return $val if $col->{right_most} && $self->{extend_right};
   $side  ||= $col->{truncate_side};
   my $mark = $col->{truncate_mark};
   if ( $side eq 'right' ) {
      $val  = substr($val, 0, $width - length $mark);
      $val .= $mark;
   }
   elsif ( $side eq 'left') {
      $val = $mark . substr($val, -1 * $width + length $mark);
   }
   else {
      MKDEBUG && _d("I don't know how to", $side, "truncate values");
   }
   return $val;
}

sub _calculate_column_widths {
   my ( $self ) = @_;

   my $extra_space = 0;
   foreach my $col ( @{$self->{cols}} ) {
      my $print_width = int($self->{line_width} * ($col->{width_pct} / 100));

      MKDEBUG && _d('col:', $col->{name}, 'width pct:', $col->{width_pct},
         'char width:', $print_width,
         'min val:', $col->{min_val}, 'max val:', $col->{max_val});

      if ( $col->{auto_width} ) {
         if ( $col->{min_val} && $print_width < $col->{min_val} ) {
            MKDEBUG && _d('Increased to min val width:', $col->{min_val});
            $print_width = $col->{min_val};
         }
         elsif ( $col->{max_val} &&  $print_width > $col->{max_val} ) {
            MKDEBUG && _d('Reduced to max val width:', $col->{max_val});
            $extra_space += $print_width - $col->{max_val};
            $print_width  = $col->{max_val};
         }
      }

      $col->{print_width} = $print_width;
      MKDEBUG && _d('print width:', $col->{print_width});
   }

   MKDEBUG && _d('Extra space:', $extra_space);
   while ( $extra_space-- ) {
      foreach my $col ( @{$self->{cols}} ) {
         if (    $col->{auto_width}
              && (    $col->{print_width} < $col->{max_val}
                   || $col->{print_width} < $col->{header_width})
         ) {
            $col->{print_width}++;
         }
      }
   }

   return;
}

sub _truncate_headers {
   my ( $self, $col ) = @_;
   my $side = $self->{truncate_header_side};
   foreach my $col ( @{$self->{cols}} ) {
      my $col_name    = $col->{name};
      my $print_width = $col->{print_width};
      next if length $col_name <= $print_width;
      $col->{name}  = $self->truncate_value($col, $col_name, $print_width, $side);
      MKDEBUG && _d('Truncated hdr', $col_name, 'to', $col->{name},
         'max width:', $print_width);
   }
   return;
}

sub _truncate_line_values {
   my ( $self, %args ) = @_;
   my $n_vals = $self->{n_cols} - 1;
   foreach my $vals ( @{$self->{lines}} ) {
      for my $i ( 0..$n_vals ) {
         my $col   = $self->{cols}->[$i];
         my $val   = defined $vals->[$i] ? $vals->[$i] : $col->{undef_value};
         my $width = length $val;

         if ( $col->{print_width} && $width > $col->{print_width} ) {
            if ( !$col->{truncate} ) {
               $self->_column_error("Value '$val' is too wide for column "
                  . $col->{name});
            }

            my $callback    = $args{truncate_callback};
            my $print_width = $col->{print_width};
            $val = $callback ? $callback->($col, $val, $print_width)
                 :             $self->truncate_value($col, $val, $print_width);
            MKDEBUG && _d('Truncated val', $vals->[$i], 'to', $val,
               '; max width:', $print_width);
            $vals->[$i] = $val;
         }
      }
   }
   return;
}

sub _make_column_formats {
   my ( $self ) = @_;
   my @col_fmts;
   my $n_cols = $self->{n_cols} - 1;
   for my $i ( 0..$n_cols ) {
      my $col = $self->{cols}->[$i];

      my $width = $col->{right_most} && !$col->{right_justify} ? ''
                : $col->{print_width};

      my $col_fmt  = '%' . ($col->{right_justify} ? '' : '-') . $width . 's';
      push @col_fmts, $col_fmt;
   }
   return @col_fmts;
}

sub _truncate_line {
   my ( $self, $line, %args ) = @_;
   my $mark = defined $args{mark} ? $args{mark} : $self->{truncate_line_mark};
   if ( $line ) {
      $line =~ s/\s+$// if $args{strip};
      my $len  = length($line);
      if ( $len > $self->{line_width} ) {
         $line  = substr($line, 0, $self->{line_width} - length $mark);
         $line .= $mark if $mark;
      }
   }
   return $line;
}

sub _column_error {
   my ( $self, $err ) = @_;
   my $msg = "Column error: $err";
   $self->{column_errors} eq 'die' ? die $msg : warn $msg;
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End ReportFormatter package
# ###########################################################################

# ###########################################################################
# QueryReportFormatter package 7274
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/QueryReportFormatter.pm
#   trunk/common/t/QueryReportFormatter.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package QueryReportFormatter;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use POSIX qw(floor);

Transformers->import(qw(
   shorten micro_t parse_timestamp unix_timestamp make_checksum percentage_of
   crc32
));

use constant MKDEBUG           => $ENV{MKDEBUG} || 0;
use constant LINE_LENGTH       => 74;
use constant MAX_STRING_LENGTH => 10;

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(OptionParser QueryRewriter Quoter) ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   my $label_width = $args{label_width} || 12;
   MKDEBUG && _d('Label width:', $label_width);

   my $cheat_width = $label_width + 1;

   my $self = {
      %args,
      label_width    => $label_width,
      num_format     => "# %-${label_width}s %3s %7s %7s %7s %7s %7s %7s %7s",
      bool_format    => "# %-${label_width}s %3d%% yes, %3d%% no",
      string_format  => "# %-${label_width}s %s",
      global_headers => [qw(    total min max avg 95% stddev median)],
      event_headers  => [qw(pct total min max avg 95% stddev median)],
      hidden_attrib  => {   # Don't sort/print these attribs in the reports.
         arg         => 1, # They're usually handled specially, or not
         fingerprint => 1, # printed at all.
         pos_in_log  => 1,
         ts          => 1,
      },
   };
   return bless $self, $class;
}

sub set_report_formatter {
   my ( $self, %args ) = @_;
   my @required_args = qw(report formatter);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless exists $args{$arg};
   }
   my ($report, $formatter) = @args{@required_args};
   $self->{formatter_for}->{$report} = $formatter;
   return;
}

sub print_reports {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(reports ea worst orderby groupby) ) {
      die "I need a $arg argument" unless exists $args{$arg};
   }
   my $reports = $args{reports};
   my $group   = $args{group};
   my $last_report;

   foreach my $report ( @$reports ) {
      MKDEBUG && _d('Printing', $report, 'report'); 
      my $report_output = $self->$report(%args);
      if ( $report_output ) {
         print "\n"
            if !$last_report || !($group->{$last_report} && $group->{$report});
         print $report_output;
      }
      else {
         MKDEBUG && _d('No', $report, 'report');
      }
      $last_report = $report;
   }

   return;
}

sub rusage {
   my ( $self ) = @_;
   my ( $rss, $vsz, $user, $system ) = ( 0, 0, 0, 0 );
   my $rusage = '';
   eval {
      my $mem = `ps -o rss,vsz -p $PID 2>&1`;
      ( $rss, $vsz ) = $mem =~ m/(\d+)/g;
      ( $user, $system ) = times();
      $rusage = sprintf "# %s user time, %s system time, %s rss, %s vsz\n",
         micro_t( $user,   p_s => 1, p_ms => 1 ),
         micro_t( $system, p_s => 1, p_ms => 1 ),
         shorten( ($rss || 0) * 1_024 ),
         shorten( ($vsz || 0) * 1_024 );
   };
   if ( $EVAL_ERROR ) {
      MKDEBUG && _d($EVAL_ERROR);
   }
   return $rusage ? $rusage : "# Could not get rusage\n";
}

sub date {
   my ( $self ) = @_;
   return "# Current date: " . (scalar localtime) . "\n";
}

sub hostname {
   my ( $self ) = @_;
   my $hostname = `hostname`;
   if ( $hostname ) {
      chomp $hostname;
      return "# Hostname: $hostname\n";
   }
   return;
}

sub files {
   my ( $self, %args ) = @_;
   if ( $args{files} ) {
      return "# Files: " . join(', ', @{$args{files}}) . "\n";
   }
   return;
}

sub header {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea orderby) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $ea      = $args{ea};
   my $orderby = $args{orderby};
   my $results = $ea->results();
   my @result;

   my $global_cnt = $results->{globals}->{$orderby}->{cnt} || 0;

   my ($qps, $conc) = (0, 0);
   if ( $global_cnt && $results->{globals}->{ts}
      && ($results->{globals}->{ts}->{max} || '')
         gt ($results->{globals}->{ts}->{min} || '')
   ) {
      eval {
         my $min  = parse_timestamp($results->{globals}->{ts}->{min});
         my $max  = parse_timestamp($results->{globals}->{ts}->{max});
         my $diff = unix_timestamp($max) - unix_timestamp($min);
         $qps     = $global_cnt / ($diff || 1);
         $conc    = $results->{globals}->{$args{orderby}}->{sum} / $diff;
      };
   }

   MKDEBUG && _d('global_cnt:', $global_cnt, 'unique:',
      scalar keys %{$results->{classes}}, 'qps:', $qps, 'conc:', $conc);
   my $line = sprintf(
      '# Overall: %s total, %s unique, %s QPS, %sx concurrency ',
      shorten($global_cnt, d=>1_000),
      shorten(scalar keys %{$results->{classes}}, d=>1_000),
      shorten($qps  || 0, d=>1_000),
      shorten($conc || 0, d=>1_000));
   $line .= ('_' x (LINE_LENGTH - length($line) + $self->{label_width} - 12));
   push @result, $line;

   if ( my $ts = $results->{globals}->{ts} ) {
      my $time_range = $self->format_time_range($ts) || "unknown";
      push @result, "# Time range: $time_range";
   }

   push @result, $self->make_global_header();

   my $attribs = $self->sort_attribs(
      ($args{select} ? $args{select} : $ea->get_attributes()),
      $ea,
   );

   foreach my $type ( qw(num innodb) ) {
      if ( $type eq 'innodb' && @{$attribs->{$type}} ) {
         push @result, "# InnoDB:";
      };

      NUM_ATTRIB:
      foreach my $attrib ( @{$attribs->{$type}} ) {
         next unless exists $results->{globals}->{$attrib};
         
         my $store   = $results->{globals}->{$attrib};
         my $metrics = $ea->stats()->{globals}->{$attrib};
         my $func    = $attrib =~ m/time|wait$/ ? \&micro_t : \&shorten;
         my @values  = ( 
            @{$store}{qw(sum min max)},
            $store->{sum} / $store->{cnt},
            @{$metrics}{qw(pct_95 stddev median)},
         );
         @values = map { defined $_ ? $func->($_) : '' } @values;

         push @result,
            sprintf $self->{num_format},
               $self->make_label($attrib), '', @values;
      }
   }

   if ( @{$attribs->{bool}} ) {
      push @result, "# Boolean:";
      my $printed_bools = 0;
      BOOL_ATTRIB:
      foreach my $attrib ( @{$attribs->{bool}} ) {
         next unless exists $results->{globals}->{$attrib};

         my $store = $results->{globals}->{$attrib};
         if ( $store->{sum} > 0 || $args{zero_bool} ) { 
            push @result,
               sprintf $self->{bool_format},
                  $self->make_label($attrib), $self->bool_percents($store);
            $printed_bools = 1;
         }
      }
      pop @result unless $printed_bools;
   }

   return join("\n", map { s/\s+$//; $_ } @result) . "\n";
}

sub query_report {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea worst orderby groupby) ) {
      die "I need a $arg argument" unless defined $arg;
   }
   my $ea      = $args{ea};
   my $groupby = $args{groupby};
   my $worst   = $args{worst};

   my $o   = $self->{OptionParser};
   my $q   = $self->{Quoter};
   my $qv  = $self->{QueryReview};
   my $qr  = $self->{QueryRewriter};

   my $report = '';

   if ( $args{print_header} ) {
      $report .= "# " . ( '#' x 72 ) . "\n"
               . "# Report grouped by $groupby\n"
               . '# ' . ( '#' x 72 ) . "\n\n";
   }

   my $attribs = $self->sort_attribs(
      ($args{select} ? $args{select} : $ea->get_attributes()),
      $ea,
   );

   ITEM:
   foreach my $top_event ( @$worst ) {
      my $item       = $top_event->[0];
      my $reason     = $args{explain_why} ? $top_event->[1] : '';
      my $rank       = $top_event->[2];
      my $stats      = $ea->results->{classes}->{$item};
      my $sample     = $ea->results->{samples}->{$item};
      my $samp_query = $sample->{arg} || '';

      my $review_vals;
      if ( $qv ) {
         $review_vals = $qv->get_review_info($item);
         next ITEM if $review_vals->{reviewed_by} && !$o->get('report-all');
      }

      my ($default_db) = $sample->{db}       ? $sample->{db}
                       : $stats->{db}->{unq} ? keys %{$stats->{db}->{unq}}
                       :                       undef;
      my @tables;
      if ( $o->get('for-explain') ) {
         @tables = $self->{QueryParser}->extract_tables(
            query      => $samp_query,
            default_db => $default_db,
            Quoter     => $self->{Quoter},
         );
      }

      $report .= "\n" if $rank > 1;  # space between each event report
      $report .= $self->event_report(
         %args,
         item    => $item,
         sample  => $sample,
         rank    => $rank,
         reason  => $reason,
         attribs => $attribs,
         db      => $default_db,
      );

      if ( $o->get('report-histogram') ) {
         $report .= $self->chart_distro(
            %args,
            attrib => $o->get('report-histogram'),
            item   => $item,
         );
      }

      if ( $qv && $review_vals ) {
         $report .= "# Review information\n";
         foreach my $col ( $qv->review_cols() ) {
            my $val = $review_vals->{$col};
            if ( !$val || $val ne '0000-00-00 00:00:00' ) { # issue 202
               $report .= sprintf "# %13s: %-s\n", $col, ($val ? $val : '');
            }
         }
      }

      if ( $groupby eq 'fingerprint' ) {
         $samp_query = $qr->shorten($samp_query, $o->get('shorten'))
            if $o->get('shorten');

         $report .= "# Fingerprint\n#    $item\n"
            if $o->get('fingerprints');

         $report .= $self->tables_report(@tables)
            if $o->get('for-explain');

         if ( $samp_query && ($args{variations} && @{$args{variations}}) ) {
            my $crc = crc32($samp_query);
            $report.= "# CRC " . ($crc ? $crc % 1_000 : "") . "\n";
         }

         my $log_type = $args{log_type} || '';
         my $mark     = $log_type eq 'memcached'
                     || $log_type eq 'http'
                     || $log_type eq 'pglog' ? '' : '\G';

         if ( $item =~ m/^(?:[\(\s]*select|insert|replace)/ ) {
            if ( $item =~ m/^(?:insert|replace)/ ) { # No EXPLAIN
               $report .= "$samp_query${mark}\n";
            }
            else {
               $report .= "# EXPLAIN /*!50100 PARTITIONS*/\n$samp_query${mark}\n"; 
               $report .= $self->explain_report($samp_query, $default_db);
            }
         }
         else {
            $report .= "$samp_query${mark}\n"; 
            my $converted = $qr->convert_to_select($samp_query);
            if ( $o->get('for-explain')
                 && $converted
                 && $converted =~ m/^[\(\s]*select/i ) {
               $report .= "# Converted for EXPLAIN\n# EXPLAIN /*!50100 PARTITIONS*/\n$converted${mark}\n";
            }
         }
      }
      else {
         if ( $groupby eq 'tables' ) {
            my ( $db, $tbl ) = $q->split_unquote($item);
            $report .= $self->tables_report([$db, $tbl]);
         }
         $report .= "$item\n";
      }
   }

   return $report;
}

sub event_report {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea item orderby) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $ea      = $args{ea};
   my $item    = $args{item};
   my $orderby = $args{orderby};
   my $results = $ea->results();
   my $o       = $self->{OptionParser};
   my @result;

   my $store = $results->{classes}->{$item};
   return "# No such event $item\n" unless $store;

   my $global_cnt = $results->{globals}->{$orderby}->{cnt};
   my $class_cnt  = $store->{$orderby}->{cnt};

   my ($qps, $conc) = (0, 0);
   if ( $global_cnt && $store->{ts}
      && ($store->{ts}->{max} || '')
         gt ($store->{ts}->{min} || '')
   ) {
      eval {
         my $min  = parse_timestamp($store->{ts}->{min});
         my $max  = parse_timestamp($store->{ts}->{max});
         my $diff = unix_timestamp($max) - unix_timestamp($min);
         $qps     = $class_cnt / $diff;
         $conc    = $store->{$orderby}->{sum} / $diff;
      };
   }

   my $line = sprintf(
      '# %s %d: %s QPS, %sx concurrency, ID 0x%s at byte %d ',
      ($ea->{groupby} eq 'fingerprint' ? 'Query' : 'Item'),
      $args{rank} || 0,
      shorten($qps  || 0, d=>1_000),
      shorten($conc || 0, d=>1_000),
      make_checksum($item),
      $results->{samples}->{$item}->{pos_in_log} || 0,
   );
   $line .= ('_' x (LINE_LENGTH - length($line) + $self->{label_width} - 12));
   push @result, $line;

   if ( $args{reason} ) {
      push @result,
         "# This item is included in the report because it matches "
            . ($args{reason} eq 'top' ? '--limit.' : '--outliers.');
   }

   {
      my $query_time = $ea->metrics(where => $item, attrib => 'Query_time');
      push @result,
         sprintf("# Scores: Apdex = %s [%3.1f]%s, V/M = %.2f",
            (defined $query_time->{apdex} ? "$query_time->{apdex}" : "NS"),
            ($query_time->{apdex_t} || 0),
            ($query_time->{cnt} < 100 ? "*" : ""),
            ($query_time->{stddev}**2 / ($query_time->{avg} || 1)),
         );
   }

   if ( $o->get('explain') && $results->{samples}->{$item}->{arg} ) {
      eval {
         my $sparkline = $self->explain_sparkline(
            $results->{samples}->{$item}->{arg}, $args{db});
         push @result, "# EXPLAIN sparkline: $sparkline\n";
      };
      if ( $EVAL_ERROR ) {
         MKDEBUG && _d("Failed to get EXPLAIN sparkline:", $EVAL_ERROR);
      }
   }

   if ( my $attrib = $o->get('report-histogram') ) {
      my $sparkline = $self->distro_sparkline(
         %args,
         attrib => $attrib,
         item   => $item,
      );
      if ( $sparkline ) {
         push @result, "# $attrib sparkline: |$sparkline|";
      }
   }

   if ( my $ts = $store->{ts} ) {
      my $time_range = $self->format_time_range($ts) || "unknown";
      push @result, "# Time range: $time_range";
   }

   push @result, $self->make_event_header();

   push @result,
      sprintf $self->{num_format}, 'Count',
         percentage_of($class_cnt, $global_cnt), $class_cnt, map { '' } (1..8);

   my $attribs = $args{attribs};
   if ( !$attribs ) {
      $attribs = $self->sort_attribs(
         ($args{select} ? $args{select} : $ea->get_attributes()),
         $ea
      );
   }

   foreach my $type ( qw(num innodb) ) {
      if ( $type eq 'innodb' && @{$attribs->{$type}} ) {
         push @result, "# InnoDB:";
      };

      NUM_ATTRIB:
      foreach my $attrib ( @{$attribs->{$type}} ) {
         next NUM_ATTRIB unless exists $store->{$attrib};
         my $vals = $store->{$attrib};
         next unless scalar %$vals;

         my $pct;
         my $func    = $attrib =~ m/time|wait$/ ? \&micro_t : \&shorten;
         my $metrics = $ea->stats()->{classes}->{$item}->{$attrib};
         my @values = (
            @{$vals}{qw(sum min max)},
            $vals->{sum} / $vals->{cnt},
            @{$metrics}{qw(pct_95 stddev median)},
         );
         @values = map { defined $_ ? $func->($_) : '' } @values;
         $pct   = percentage_of(
            $vals->{sum}, $results->{globals}->{$attrib}->{sum});

         push @result,
            sprintf $self->{num_format},
               $self->make_label($attrib), $pct, @values;
      }
   }

   if ( @{$attribs->{bool}} ) {
      push @result, "# Boolean:";
      my $printed_bools = 0;
      BOOL_ATTRIB:
      foreach my $attrib ( @{$attribs->{bool}} ) {
         next BOOL_ATTRIB unless exists $store->{$attrib};
         my $vals = $store->{$attrib};
         next unless scalar %$vals;

         if ( $vals->{sum} > 0 || $args{zero_bool} ) {
            push @result,
               sprintf $self->{bool_format},
                  $self->make_label($attrib), $self->bool_percents($vals);
            $printed_bools = 1;
         }
      }
      pop @result unless $printed_bools;
   }

   if ( @{$attribs->{string}} ) {
      push @result, "# String:";
      my $printed_strings = 0;
      STRING_ATTRIB:
      foreach my $attrib ( @{$attribs->{string}} ) {
         next STRING_ATTRIB unless exists $store->{$attrib};
         my $vals = $store->{$attrib};
         next unless scalar %$vals;

         push @result,
            sprintf $self->{string_format},
               $self->make_label($attrib),
               $self->format_string_list($attrib, $vals, $class_cnt);
         $printed_strings = 1;
      }
      pop @result unless $printed_strings;
   }

   return join("\n", map { s/\s+$//; $_ } @result) . "\n";
}

sub chart_distro {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea item attrib) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $ea     = $args{ea};
   my $item   = $args{item};
   my $attrib = $args{attrib};

   my $results = $ea->results();
   my $store   = $results->{classes}->{$item}->{$attrib};
   my $vals    = $store->{all};
   return "" unless defined $vals && scalar %$vals;

   my @buck_tens = $ea->buckets_of(10);
   my @distro = map { 0 } (0 .. 7);

   my @buckets = map { 0 } (0..999);
   map { $buckets[$_] = $vals->{$_} } keys %$vals;
   $vals = \@buckets;  # repoint vals from given hashref to our array

   map { $distro[$buck_tens[$_]] += $vals->[$_] } (1 .. @$vals - 1);

   my $vals_per_mark; # number of vals represented by 1 #-mark
   my $max_val        = 0;
   my $max_disp_width = 64;
   my $bar_fmt        = "# %5s%s";
   my @distro_labels  = qw(1us 10us 100us 1ms 10ms 100ms 1s 10s+);
   my @results        = "# $attrib distribution";

   foreach my $n_vals ( @distro ) {
      $max_val = $n_vals if $n_vals > $max_val;
   }
   $vals_per_mark = $max_val / $max_disp_width;

   foreach my $i ( 0 .. $#distro ) {
      my $n_vals  = $distro[$i];
      my $n_marks = $n_vals / ($vals_per_mark || 1);

      $n_marks = 1 if $n_marks < 1 && $n_vals > 0;

      my $bar = ($n_marks ? '  ' : '') . '#' x $n_marks;
      push @results, sprintf $bar_fmt, $distro_labels[$i], $bar;
   }

   return join("\n", @results) . "\n";
}


sub distro_sparkline {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea item attrib) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $ea     = $args{ea};
   my $item   = $args{item};
   my $attrib = $args{attrib};

   my $results = $ea->results();
   my $store   = $results->{classes}->{$item}->{$attrib};
   my $vals    = $store->{all};

   my $all_zeros_sparkline = " " x 8;

   return $all_zeros_sparkline unless defined $vals && scalar %$vals;

   my @buck_tens      = $ea->buckets_of(10);
   my @distro         = map { 0 } (0 .. 7);
   my @buckets        = map { 0 } (0..999);
   map { $buckets[$_] = $vals->{$_} } keys %$vals;
   $vals = \@buckets;
   map { $distro[$buck_tens[$_]] += $vals->[$_] } (1 .. @$vals - 1);

   my $vals_per_mark;
   my $max_val        = 0;
   my $max_disp_width = 64;
   foreach my $n_vals ( @distro ) {
      $max_val = $n_vals if $n_vals > $max_val;
   }
   $vals_per_mark = $max_val / $max_disp_width;

   my ($min, $max);
   foreach my $i ( 0 .. $#distro ) {
      my $n_vals  = $distro[$i];
      my $n_marks = $n_vals / ($vals_per_mark || 1);
      $n_marks    = 1 if $n_marks < 1 && $n_vals > 0;

      $min = $n_marks if $n_marks && (!$min || $n_marks < $min);
      $max = $n_marks if !$max || $n_marks > $max;
   }
   return $all_zeros_sparkline unless $min && $max;


   $min = 0 if $min == $max;
   my @range_min;
   my $d = floor(($max-$min) / 4);
   for my $x ( 1..4 ) {
      push @range_min, $min + ($d * $x);
   }

   my $sparkline = ""; 
   foreach my $i ( 0 .. $#distro ) {
      my $n_vals  = $distro[$i];
      my $n_marks = $n_vals / ($vals_per_mark || 1);
      $n_marks    = 1 if $n_marks < 1 && $n_vals > 0;
      $sparkline .= $n_marks <= 0             ? ' '
                  : $n_marks <= $range_min[0] ? '_'
                  : $n_marks <= $range_min[1] ? '.'
                  : $n_marks <= $range_min[2] ? '-'
                  :                             '^';
   }

   return $sparkline;
}

sub profile {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea worst groupby) ) {
      die "I need a $arg argument" unless defined $arg;
   }
   my $ea      = $args{ea};
   my $worst   = $args{worst};
   my $other   = $args{other};
   my $groupby = $args{groupby};

   my $qr  = $self->{QueryRewriter};
   my $o   = $self->{OptionParser};

   my $results = $ea->results();
   my $total_r = $results->{globals}->{Query_time}->{sum} || 0;

   my @profiles;
   foreach my $top_event ( @$worst ) {
      my $item       = $top_event->[0];
      my $rank       = $top_event->[2];
      my $stats      = $ea->results->{classes}->{$item};
      my $sample     = $ea->results->{samples}->{$item};
      my $samp_query = $sample->{arg} || '';
      my $query_time = $ea->metrics(where => $item, attrib => 'Query_time');

      my %profile    = (
         rank   => $rank,
         r      => $stats->{Query_time}->{sum},
         cnt    => $stats->{Query_time}->{cnt},
         sample => $groupby eq 'fingerprint' ?
                    $qr->distill($samp_query, %{$args{distill_args}}) : $item,
         id     => $groupby eq 'fingerprint' ? make_checksum($item)   : '',
         vmr    => ($query_time->{stddev}**2) / ($query_time->{avg} || 1),
         apdex  => defined $query_time->{apdex} ? $query_time->{apdex} : "NS",
      ); 

      if ( $o->get('explain') && $samp_query ) {
         my ($default_db) = $sample->{db}       ? $sample->{db}
                          : $stats->{db}->{unq} ? keys %{$stats->{db}->{unq}}
                          :                       undef;
         eval {
            $profile{explain_sparkline} = $self->explain_sparkline(
               $samp_query, $default_db);
         };
         if ( $EVAL_ERROR ) {
            MKDEBUG && _d("Failed to get EXPLAIN sparkline:", $EVAL_ERROR);
         }
      }

      push @profiles, \%profile;
   }

   my $report = $self->{formatter_for}->{profile} || new ReportFormatter(
      line_width       => LINE_LENGTH,
      long_last_column => 1,
      extend_right     => 1,
   );
   $report->set_title('Profile');
   my @cols = (
      { name => 'Rank',          right_justify => 1,             },
      { name => 'Query ID',                                      },
      { name => 'Response time', right_justify => 1,             },
      { name => 'Calls',         right_justify => 1,             },
      { name => 'R/Call',        right_justify => 1,             },
      { name => 'Apdx',          right_justify => 1, width => 4, },
      { name => 'V/M',           right_justify => 1, width => 5, },
      ( $o->get('explain') ? { name => 'EXPLAIN' } : () ),
      { name => 'Item',                                          },
   );
   $report->set_columns(@cols);

   foreach my $item ( sort { $a->{rank} <=> $b->{rank} } @profiles ) {
      my $rt  = sprintf('%10.4f', $item->{r});
      my $rtp = sprintf('%4.1f%%', $item->{r} / ($total_r || 1) * 100);
      my $rc  = sprintf('%8.4f', $item->{r} / $item->{cnt});
      my $vmr = sprintf('%4.2f', $item->{vmr});
      my @vals = (
         $item->{rank},
         "0x$item->{id}",
         "$rt $rtp",
         $item->{cnt},
         $rc,
         $item->{apdex},
         $vmr,
         ( $o->get('explain') ? $item->{explain_sparkline} || "" : () ),
         $item->{sample},
      );
      $report->add_line(@vals);
   }

   if ( $other && @$other ) {
      my $misc = {
            r   => 0,
            cnt => 0,
      };
      foreach my $other_event ( @$other ) {
         my $item      = $other_event->[0];
         my $stats     = $ea->results->{classes}->{$item};
         $misc->{r}   += $stats->{Query_time}->{sum};
         $misc->{cnt} += $stats->{Query_time}->{cnt};
      }
      my $rt  = sprintf('%10.4f', $misc->{r});
      my $rtp = sprintf('%4.1f%%', $misc->{r} / ($total_r || 1) * 100);
      my $rc  = sprintf('%8.4f', $misc->{r} / $misc->{cnt});
      $report->add_line(
         "MISC",
         "0xMISC",
         "$rt $rtp",
         $misc->{cnt},
         $rc,
         'NS',   # Apdex is not meaningful here
         '0.0',  # variance-to-mean ratio is not meaningful here
         ( $o->get('explain') ? "MISC" : () ),
         "<".scalar @$other." ITEMS>",
      );
   }

   return $report->get_report();
}

sub prepared {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(ea worst groupby) ) {
      die "I need a $arg argument" unless defined $arg;
   }
   my $ea      = $args{ea};
   my $worst   = $args{worst};
   my $groupby = $args{groupby};

   my $qr = $self->{QueryRewriter};

   my @prepared;       # prepared statements
   my %seen_prepared;  # report each PREP-EXEC pair once
   my $total_r = 0;

   foreach my $top_event ( @$worst ) {
      my $item       = $top_event->[0];
      my $rank       = $top_event->[2];
      my $stats      = $ea->results->{classes}->{$item};
      my $sample     = $ea->results->{samples}->{$item};
      my $samp_query = $sample->{arg} || '';

      $total_r += $stats->{Query_time}->{sum};
      next unless $stats->{Statement_id} && $item =~ m/^(?:prepare|execute) /;

      my ($prep_stmt, $prep, $prep_r, $prep_cnt);
      my ($exec_stmt, $exec, $exec_r, $exec_cnt);

      if ( $item =~ m/^prepare / ) {
         $prep_stmt           = $item;
         ($exec_stmt = $item) =~ s/^prepare /execute /;
      }
      else {
         ($prep_stmt = $item) =~ s/^execute /prepare /;
         $exec_stmt           = $item;
      }

      if ( !$seen_prepared{$prep_stmt}++ ) {
         $exec     = $ea->results->{classes}->{$exec_stmt};
         $exec_r   = $exec->{Query_time}->{sum};
         $exec_cnt = $exec->{Query_time}->{cnt};
         $prep     = $ea->results->{classes}->{$prep_stmt};
         $prep_r   = $prep->{Query_time}->{sum};
         $prep_cnt = scalar keys %{$prep->{Statement_id}->{unq}},
         push @prepared, {
            prep_r   => $prep_r, 
            prep_cnt => $prep_cnt,
            exec_r   => $exec_r,
            exec_cnt => $exec_cnt,
            rank     => $rank,
            sample   => $groupby eq 'fingerprint'
                          ? $qr->distill($samp_query, %{$args{distill_args}})
                          : $item,
            id       => $groupby eq 'fingerprint' ? make_checksum($item)
                                                  : '',
         };
      }
   }

   return unless scalar @prepared;

   my $report = $self->{formatter_for}->{prepared} || new ReportFormatter(
      line_width       => LINE_LENGTH,
      long_last_column => 1,
      extend_right     => 1,     
   );
   $report->set_title('Prepared statements');
   $report->set_columns(
      { name => 'Rank',          right_justify => 1, },
      { name => 'Query ID',                          },
      { name => 'PREP',          right_justify => 1, },
      { name => 'PREP Response', right_justify => 1, },
      { name => 'EXEC',          right_justify => 1, },
      { name => 'EXEC Response', right_justify => 1, },
      { name => 'Item',                              },
   );

   foreach my $item ( sort { $a->{rank} <=> $b->{rank} } @prepared ) {
      my $exec_rt  = sprintf('%10.4f', $item->{exec_r});
      my $exec_rtp = sprintf('%4.1f%%',$item->{exec_r}/($total_r || 1) * 100);
      my $prep_rt  = sprintf('%10.4f', $item->{prep_r});
      my $prep_rtp = sprintf('%4.1f%%',$item->{prep_r}/($total_r || 1) * 100);
      $report->add_line(
         $item->{rank},
         "0x$item->{id}",
         $item->{prep_cnt} || 0,
         "$prep_rt $prep_rtp",
         $item->{exec_cnt} || 0,
         "$exec_rt $exec_rtp",
         $item->{sample},
      );
   }
   return $report->get_report();
}

sub make_global_header {
   my ( $self ) = @_;
   my @lines;

   push @lines,
      sprintf $self->{num_format}, "Attribute", '', @{$self->{global_headers}};

   push @lines,
      sprintf $self->{num_format},
         (map { "=" x $_ } $self->{label_width}),
         (map { " " x $_ } qw(3)),  # no pct column in global header
         (map { "=" x $_ } qw(7 7 7 7 7 7 7));

   return @lines;
}

sub make_event_header {
   my ( $self ) = @_;

   return @{$self->{event_header_lines}} if $self->{event_header_lines};

   my @lines;
   push @lines,
      sprintf $self->{num_format}, "Attribute", @{$self->{event_headers}};

   push @lines,
      sprintf $self->{num_format},
         map { "=" x $_ } ($self->{label_width}, qw(3 7 7 7 7 7 7 7));

   $self->{event_header_lines} = \@lines;
   return @lines;
}

sub make_label {
   my ( $self, $val ) = @_;
   return '' unless $val;

   $val =~ s/_/ /g;

   if ( $val =~ m/^InnoDB/ ) {
      $val =~ s/^InnoDB //;
      $val = $val eq 'trx id' ? "InnoDB trxID"
           : substr($val, 0, $self->{label_width});
   }

   $val = $val eq 'user'            ? 'Users'
        : $val eq 'db'              ? 'Databases'
        : $val eq 'Query time'      ? 'Exec time'
        : $val eq 'host'            ? 'Hosts'
        : $val eq 'Error no'        ? 'Errors'
        : $val eq 'bytes'           ? 'Query size'
        : $val eq 'Tmp disk tables' ? 'Tmp disk tbl'
        : $val eq 'Tmp table sizes' ? 'Tmp tbl size'
        : substr($val, 0, $self->{label_width});

   return $val;
}

sub bool_percents {
   my ( $self, $vals ) = @_;
   my $p_true  = percentage_of($vals->{sum},  $vals->{cnt});
   my $p_false = percentage_of(($vals->{cnt} - $vals->{sum}), $vals->{cnt});
   return $p_true, $p_false;
}

sub format_string_list {
   my ( $self, $attrib, $vals, $class_cnt ) = @_;
   my $o        = $self->{OptionParser};
   my $show_all = $o->get('show-all');

   if ( !exists $vals->{unq} ) {
      return ($vals->{cnt});
   }

   my $cnt_for = $vals->{unq};
   if ( 1 == keys %$cnt_for ) {
      my ($str) = keys %$cnt_for;
      $str = substr($str, 0, LINE_LENGTH - 30) . '...'
         if length $str > LINE_LENGTH - 30;
      return $str;
   }
   my $line = '';
   my @top = sort { $cnt_for->{$b} <=> $cnt_for->{$a} || $a cmp $b }
                  keys %$cnt_for;
   my $i = 0;
   foreach my $str ( @top ) {
      my $print_str;
      if ( $str =~ m/(?:\d+\.){3}\d+/ ) {
         $print_str = $str;  # Do not shorten IP addresses.
      }
      elsif ( length $str > MAX_STRING_LENGTH ) {
         $print_str = substr($str, 0, MAX_STRING_LENGTH) . '...';
      }
      else {
         $print_str = $str;
      }
      my $p = percentage_of($cnt_for->{$str}, $class_cnt);
      $print_str .= " ($cnt_for->{$str}/$p%)";
      if ( !$show_all->{$attrib} ) {
         last if (length $line) + (length $print_str)  > LINE_LENGTH - 27;
      }
      $line .= "$print_str, ";
      $i++;
   }

   $line =~ s/, $//;

   if ( $i < @top ) {
      $line .= "... " . (@top - $i) . " more";
   }

   return $line;
}

sub sort_attribs {
   my ( $self, $attribs, $ea ) = @_;
   return unless $attribs && @$attribs;
   MKDEBUG && _d("Sorting attribs:", @$attribs);

   my @num_order = qw(
      Query_time
      Exec_orig_time
      Transmit_time
      Lock_time
      Rows_sent
      Rows_examined
      Rows_affected
      Rows_read
      Bytes_sent
      Merge_passes
      Tmp_tables
      Tmp_disk_tables
      Tmp_table_sizes
      bytes
   );
   my $i         = 0;
   my %num_order = map { $_ => $i++ } @num_order;

   my (@num, @innodb, @bool, @string);
   ATTRIB:
   foreach my $attrib ( @$attribs ) {
      next if $self->{hidden_attrib}->{$attrib};

      my $type = $ea->type_for($attrib) || 'string';
      if ( $type eq 'num' ) {
         if ( $attrib =~ m/^InnoDB_/ ) {
            push @innodb, $attrib;
         }
         else {
            push @num, $attrib;
         }
      }
      elsif ( $type eq 'bool' ) {
         push @bool, $attrib;
      }
      elsif ( $type eq 'string' ) {
         push @string, $attrib;
      }
      else {
         MKDEBUG && _d("Unknown attrib type:", $type, "for", $attrib);
      }
   }

   @num    = sort { pref_sort($a, $num_order{$a}, $b, $num_order{$b}) } @num;
   @innodb = sort { uc $a cmp uc $b } @innodb;
   @bool   = sort { uc $a cmp uc $b } @bool;
   @string = sort { uc $a cmp uc $b } @string;

   return {
      num     => \@num,
      innodb  => \@innodb,
      string  => \@string,
      bool    => \@bool,
   };
}

sub pref_sort {
   my ( $attrib_a, $order_a, $attrib_b, $order_b ) = @_;

   if ( !defined $order_a && !defined $order_b ) {
      return $attrib_a cmp $attrib_b;
   }

   if ( defined $order_a && defined $order_b ) {
      return $order_a <=> $order_b;
   }

   if ( !defined $order_a ) {
      return 1;
   }
   else {
      return -1;
   }
}

sub tables_report {
   my ( $self, @tables ) = @_;
   return '' unless @tables;
   my $q      = $self->{Quoter};
   my $tables = "";
   foreach my $db_tbl ( @tables ) {
      my ( $db, $tbl ) = @$db_tbl;
      $tables .= '#    SHOW TABLE STATUS'
               . ($db ? " FROM `$db`" : '')
               . " LIKE '$tbl'\\G\n";
      $tables .= "#    SHOW CREATE TABLE "
               . $q->quote(grep { $_ } @$db_tbl)
               . "\\G\n";
   }
   return $tables ? "# Tables\n$tables" : "# No tables\n";
}

sub explain_report {
   my ( $self, $query, $db ) = @_;
   return '' unless $query;

   my $dbh = $self->{dbh};
   my $q   = $self->{Quoter};
   my $qp  = $self->{QueryParser};
   return '' unless $dbh && $q && $qp;

   my $explain = '';
   eval {
      if ( !$qp->has_derived_table($query) ) {
         if ( $db ) {
            MKDEBUG && _d($dbh, "USE", $db);
            $dbh->do("USE " . $q->quote($db));
         }
         my $sth = $dbh->prepare("EXPLAIN /*!50100 PARTITIONS */ $query");
         $sth->execute();
         my $i = 1;
         while ( my @row = $sth->fetchrow_array() ) {
            $explain .= "# *************************** $i. "
                      . "row ***************************\n";
            foreach my $j ( 0 .. $#row ) {
               $explain .= sprintf "# %13s: %s\n", $sth->{NAME}->[$j],
                  defined $row[$j] ? $row[$j] : 'NULL';
            }
            $i++;  # next row number
         }
      }
   };
   if ( $EVAL_ERROR ) {
      MKDEBUG && _d("EXPLAIN failed:", $query, $EVAL_ERROR);
   }
   return $explain ? $explain : "# EXPLAIN failed: $EVAL_ERROR";
}

sub format_time_range {
   my ( $self, $vals ) = @_;
   my $min = parse_timestamp($vals->{min} || '');
   my $max = parse_timestamp($vals->{max} || '');

   if ( $min && $max && $min eq $max ) {
      return "all events occurred at $min";
   }

   my ($min_day) = split(' ', $min) if $min;
   my ($max_day) = split(' ', $max) if $max;
   if ( ($min_day || '') eq ($max_day || '') ) {
      (undef, $max) = split(' ', $max);
   }

   return $min && $max ? "$min to $max" : '';
}

sub explain_sparkline {
   my ( $self, $query, $db ) = @_;
   return unless $query;

   my $q   = $self->{Quoter};
   my $dbh = $self->{dbh};
   my $ex  = $self->{ExplainAnalyzer};
   return unless $dbh && $ex;

   if ( $db ) {
      MKDEBUG && _d($dbh, "USE", $db);
      $dbh->do("USE " . $q->quote($db));
   }
   my $res = $ex->normalize(
      $ex->explain_query(
         dbh   => $dbh,
         query => $query,
      )
   );

   my $sparkline;
   if ( $res ) {
      $sparkline = $ex->sparkline(explain => $res);
   }

   return $sparkline;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End QueryReportFormatter package
# ###########################################################################

# ###########################################################################
# EventTimeline package 6590
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/EventTimeline.pm
#   trunk/common/t/EventTimeline.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################


package EventTimeline;


use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
Transformers->import(qw(parse_timestamp secs_to_time unix_timestamp));

use constant MKDEBUG => $ENV{MKDEBUG} || 0;
use constant KEY     => 0;
use constant CNT     => 1;
use constant ATT     => 2;

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(groupby attributes) ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   my %is_groupby = map { $_ => 1 } @{$args{groupby}};

   return bless {
      groupby    => $args{groupby},
      attributes => [ grep { !$is_groupby{$_} } @{$args{attributes}} ],
      results    => [],
   }, $class;
}

sub reset_aggregated_data {
   my ( $self ) = @_;
   $self->{results} = [];
}

sub aggregate {
   my ( $self, $event ) = @_;
   my $handler = $self->{handler};
   if ( !$handler ) {
      $handler = $self->make_handler($event);
      $self->{handler} = $handler;
   }
   return unless $handler;
   $handler->($event);
}

sub results {
   my ( $self ) = @_;
   return $self->{results};
}

sub make_handler {
   my ( $self, $event ) = @_;

   my $float_re = qr{[+-]?(?:(?=\d|[.])\d*(?:[.])\d{0,})?(?:[E](?:[+-]?\d+)|)}i;
   my @lines; # lines of code for the subroutine

   foreach my $attrib ( @{$self->{attributes}} ) {
      my ($val) = $event->{$attrib};
      next unless defined $val; # Can't decide type if it's undef.

      my $type = $val  =~ m/^(?:\d+|$float_re)$/o ? 'num'
               : $val  =~ m/^(?:Yes|No)$/         ? 'bool'
               :                                    'string';
      MKDEBUG && _d('Type for', $attrib, 'is', $type, '(sample:', $val, ')');
      $self->{type_for}->{$attrib} = $type;

      push @lines, (
         "\$val = \$event->{$attrib};",
         'defined $val && do {',
         "# type: $type",
         "\$store = \$last->[ATT]->{$attrib} ||= {};",
      );

      if ( $type eq 'bool' ) {
         push @lines, q{$val = $val eq 'Yes' ? 1 : 0;};
         $type = 'num';
      }
      my $op   = $type eq 'num' ? '<' : 'lt';
      push @lines, (
         '$store->{min} = $val if !defined $store->{min} || $val '
            . $op . ' $store->{min};',
      );
      $op = ($type eq 'num') ? '>' : 'gt';
      push @lines, (
         '$store->{max} = $val if !defined $store->{max} || $val '
            . $op . ' $store->{max};',
      );
      if ( $type eq 'num' ) {
         push @lines, '$store->{sum} += $val;';
      }
      push @lines, '};';
   }

   unshift @lines, (
      'sub {',
      'my ( $event ) = @_;',
      'my ($val, $last, $store);', # NOTE: define all variables here
      '$last = $results->[-1];',
      'if ( !$last || '
         . join(' || ',
            map { "\$last->[KEY]->[$_] ne (\$event->{$self->{groupby}->[$_]} || 0)" }
                (0 .. @{$self->{groupby}} -1))
         . ' ) {',
      '  $last = [['
         . join(', ',
            map { "(\$event->{$self->{groupby}->[$_]} || 0)" }
                (0 .. @{$self->{groupby}} -1))
         . '], 0, {} ];',
      '  push @$results, $last;',
      '}',
      '++$last->[CNT];',
   );
   push @lines, '}';
   my $results = $self->{results}; # Referred to by the eval
   my $code = join("\n", @lines);
   $self->{code} = $code;

   MKDEBUG && _d('Timeline handler:', $code);
   my $sub = eval $code;
   die if $EVAL_ERROR;
   return $sub;
}

sub report {
   my ( $self, $results, $callback ) = @_;
   $callback->("# " . ('#' x 72) . "\n");
   $callback->("# " . join(',', @{$self->{groupby}}) . " report\n");
   $callback->("# " . ('#' x 72) . "\n");
   foreach my $res ( @$results ) {
      my $t;
      my @vals;
      if ( ($t = $res->[ATT]->{ts}) && $t->{min} ) {
         my $min = parse_timestamp($t->{min});
         push @vals, $min;
         if ( $t->{max} && $t->{max} gt $t->{min} ) {
            my $max  = parse_timestamp($t->{max});
            my $diff = secs_to_time(unix_timestamp($max) - unix_timestamp($min));
            push @vals, $diff;
         }
         else {
            push @vals, '0:00';
         }
      }
      else {
         push @vals, ('', '');
      }
      $callback->(sprintf("# %19s %7s %3d %s\n", @vals, $res->[CNT], $res->[KEY]->[0]));
   }
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End EventTimeline package
# ###########################################################################

# ###########################################################################
# QueryParser package 7452
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/QueryParser.pm
#   trunk/common/t/QueryParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package QueryParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;
our $tbl_ident = qr/(?:`[^`]+`|\w+)(?:\.(?:`[^`]+`|\w+))?/;
our $tbl_regex = qr{
         \b(?:FROM|JOIN|(?<!KEY\s)UPDATE|INTO) # Words that precede table names
         \b\s*
         \(?                                   # Optional paren around tables
         ($tbl_ident
            (?: (?:\s+ (?:AS\s+)? \w+)?, \s*$tbl_ident )*
         )
      }xio;
our $has_derived = qr{
      \b(?:FROM|JOIN|,)
      \s*\(\s*SELECT
   }xi;

our $data_def_stmts = qr/(?:CREATE|ALTER|TRUNCATE|DROP|RENAME)/i;

our $data_manip_stmts = qr/(?:INSERT|UPDATE|DELETE|REPLACE)/i;

sub new {
   my ( $class ) = @_;
   bless {}, $class;
}

sub get_tables {
   my ( $self, $query ) = @_;
   return unless $query;
   MKDEBUG && _d('Getting tables for', $query);

   my ( $ddl_stmt ) = $query =~ m/^\s*($data_def_stmts)\b/i;
   if ( $ddl_stmt ) {
      MKDEBUG && _d('Special table type:', $ddl_stmt);
      $query =~ s/IF\s+(?:NOT\s+)?EXISTS//i;
      if ( $query =~ m/$ddl_stmt DATABASE\b/i ) {
         MKDEBUG && _d('Query alters a database, not a table');
         return ();
      }
      if ( $ddl_stmt =~ m/CREATE/i && $query =~ m/$ddl_stmt\b.+?\bSELECT\b/i ) {
         my ($select) = $query =~ m/\b(SELECT\b.+)/is;
         MKDEBUG && _d('CREATE TABLE ... SELECT:', $select);
         return $self->get_tables($select);
      }
      my ($tbl) = $query =~ m/TABLE\s+($tbl_ident)(\s+.*)?/i;
      MKDEBUG && _d('Matches table:', $tbl);
      return ($tbl);
   }

   $query =~ s/ (?:LOW_PRIORITY|IGNORE|STRAIGHT_JOIN)//ig;

   if ( $query =~ /^\s*LOCK TABLES/i ) {
      MKDEBUG && _d('Special table type: LOCK TABLES');
      $query =~ s/^(\s*LOCK TABLES\s+)//;
      $query =~ s/\s+(?:READ|WRITE|LOCAL)+\s*//g;
      MKDEBUG && _d('Locked tables:', $query);
      $query = "FROM $query";
   }

   $query =~ s/\\["']//g;                # quoted strings
   $query =~ s/".*?"/?/sg;               # quoted strings
   $query =~ s/'.*?'/?/sg;               # quoted strings

   my @tables;
   foreach my $tbls ( $query =~ m/$tbl_regex/gio ) {
      MKDEBUG && _d('Match tables:', $tbls);

      next if $tbls =~ m/\ASELECT\b/i;

      foreach my $tbl ( split(',', $tbls) ) {
         $tbl =~ s/\s*($tbl_ident)(\s+.*)?/$1/gio;

         if ( $tbl !~ m/[a-zA-Z]/ ) {
            MKDEBUG && _d('Skipping suspicious table name:', $tbl);
            next;
         }

         push @tables, $tbl;
      }
   }
   return @tables;
}

sub has_derived_table {
   my ( $self, $query ) = @_;
   my $match = $query =~ m/$has_derived/;
   MKDEBUG && _d($query, 'has ' . ($match ? 'a' : 'no') . ' derived table');
   return $match;
}

sub get_aliases {
   my ( $self, $query, $list ) = @_;

   my $result = {
      DATABASE => {},
      TABLE    => {},
   };
   return $result unless $query;

   $query =~ s/ (?:LOW_PRIORITY|IGNORE|STRAIGHT_JOIN)//ig;

   $query =~ s/ (?:INNER|OUTER|CROSS|LEFT|RIGHT|NATURAL)//ig;

   my @tbl_refs;
   my ($tbl_refs, $from) = $query =~ m{
      (
         (FROM|INTO|UPDATE)\b\s*   # Keyword before table refs
         .+?                       # Table refs
      )
      (?:\s+|\z)                   # If the query does not end with the table
      (?:WHERE|ORDER|LIMIT|HAVING|SET|VALUES|\z) # Keyword after table refs
   }ix;

   if ( $tbl_refs ) {

      if ( $query =~ m/^(?:INSERT|REPLACE)/i ) {
         $tbl_refs =~ s/\([^\)]+\)\s*//;
      }

      MKDEBUG && _d('tbl refs:', $tbl_refs);

      my $before_tbl = qr/(?:,|JOIN|\s|$from)+/i;

      my $after_tbl  = qr/(?:,|JOIN|ON|USING|\z)/i;

      $tbl_refs =~ s/ = /=/g;

      while (
         $tbl_refs =~ m{
            $before_tbl\b\s*
               ( ($tbl_ident) (?:\s+ (?:AS\s+)? (\w+))? )
            \s*$after_tbl
         }xgio )
      {
         my ( $tbl_ref, $db_tbl, $alias ) = ($1, $2, $3);
         MKDEBUG && _d('Match table:', $tbl_ref);
         push @tbl_refs, $tbl_ref;
         $alias = $self->trim_identifier($alias);

         if ( $tbl_ref =~ m/^AS\s+\w+/i ) {
            MKDEBUG && _d('Subquery', $tbl_ref);
            $result->{TABLE}->{$alias} = undef;
            next;
         }

         my ( $db, $tbl ) = $db_tbl =~ m/^(?:(.*?)\.)?(.*)/;
         $db  = $self->trim_identifier($db);
         $tbl = $self->trim_identifier($tbl);
         $result->{TABLE}->{$alias || $tbl} = $tbl;
         $result->{DATABASE}->{$tbl}        = $db if $db;
      }
   }
   else {
      MKDEBUG && _d("No tables ref in", $query);
   }

   if ( $list ) {
      return \@tbl_refs;
   }
   else {
      return $result;
   }
}

sub split {
   my ( $self, $query ) = @_;
   return unless $query;
   $query = $self->clean_query($query);
   MKDEBUG && _d('Splitting', $query);

   my $verbs = qr{SELECT|INSERT|UPDATE|DELETE|REPLACE|UNION|CREATE}i;

   my @split_statements = grep { $_ } split(m/\b($verbs\b(?!(?:\s*\()))/io, $query);

   my @statements;
   if ( @split_statements == 1 ) {
      push @statements, $query;
   }
   else {
      for ( my $i = 0; $i <= $#split_statements; $i += 2 ) {
         push @statements, $split_statements[$i].$split_statements[$i+1];

         if ( $statements[-2] && $statements[-2] =~ m/on duplicate key\s+$/i ) {
            $statements[-2] .= pop @statements;
         }
      }
   }

   MKDEBUG && _d('statements:', map { $_ ? "<$_>" : 'none' } @statements);
   return @statements;
}

sub clean_query {
   my ( $self, $query ) = @_;
   return unless $query;
   $query =~ s!/\*.*?\*/! !g;  # Remove /* comment blocks */
   $query =~ s/^\s+//;         # Remove leading spaces
   $query =~ s/\s+$//;         # Remove trailing spaces
   $query =~ s/\s{2,}/ /g;     # Remove extra spaces
   return $query;
}

sub split_subquery {
   my ( $self, $query ) = @_;
   return unless $query;
   $query = $self->clean_query($query);
   $query =~ s/;$//;

   my @subqueries;
   my $sqno = 0;  # subquery number
   my $pos  = 0;
   while ( $query =~ m/(\S+)(?:\s+|\Z)/g ) {
      $pos = pos($query);
      my $word = $1;
      MKDEBUG && _d($word, $sqno);
      if ( $word =~ m/^\(?SELECT\b/i ) {
         my $start_pos = $pos - length($word) - 1;
         if ( $start_pos ) {
            $sqno++;
            MKDEBUG && _d('Subquery', $sqno, 'starts at', $start_pos);
            $subqueries[$sqno] = {
               start_pos => $start_pos,
               end_pos   => 0,
               len       => 0,
               words     => [$word],
               lp        => 1, # left parentheses
               rp        => 0, # right parentheses
               done      => 0,
            };
         }
         else {
            MKDEBUG && _d('Main SELECT at pos 0');
         }
      }
      else {
         next unless $sqno;  # next unless we're in a subquery
         MKDEBUG && _d('In subquery', $sqno);
         my $sq = $subqueries[$sqno];
         if ( $sq->{done} ) {
            MKDEBUG && _d('This subquery is done; SQL is for',
               ($sqno - 1 ? "subquery $sqno" : "the main SELECT"));
            next;
         }
         push @{$sq->{words}}, $word;
         my $lp = ($word =~ tr/\(//) || 0;
         my $rp = ($word =~ tr/\)//) || 0;
         MKDEBUG && _d('parentheses left', $lp, 'right', $rp);
         if ( ($sq->{lp} + $lp) - ($sq->{rp} + $rp) == 0 ) {
            my $end_pos = $pos - 1;
            MKDEBUG && _d('Subquery', $sqno, 'ends at', $end_pos);
            $sq->{end_pos} = $end_pos;
            $sq->{len}     = $end_pos - $sq->{start_pos};
         }
      }
   }

   for my $i ( 1..$#subqueries ) {
      my $sq = $subqueries[$i];
      next unless $sq;
      $sq->{sql} = join(' ', @{$sq->{words}});
      substr $query,
         $sq->{start_pos} + 1,  # +1 for (
         $sq->{len} - 1,        # -1 for )
         "__subquery_$i";
   }

   return $query, map { $_->{sql} } grep { defined $_ } @subqueries;
}

sub query_type {
   my ( $self, $query, $qr ) = @_;
   my ($type, undef) = $qr->distill_verbs($query);
   my $rw;
   if ( $type =~ m/^SELECT\b/ ) {
      $rw = 'read';
   }
   elsif ( $type =~ m/^$data_manip_stmts\b/
           || $type =~ m/^$data_def_stmts\b/  ) {
      $rw = 'write'
   }

   return {
      type => $type,
      rw   => $rw,
   }
}

sub get_columns {
   my ( $self, $query ) = @_;
   my $cols = [];
   return $cols unless $query;
   my $cols_def;

   if ( $query =~ m/^SELECT/i ) {
      $query =~ s/
         ^SELECT\s+
           (?:ALL
              |DISTINCT
              |DISTINCTROW
              |HIGH_PRIORITY
              |STRAIGHT_JOIN
              |SQL_SMALL_RESULT
              |SQL_BIG_RESULT
              |SQL_BUFFER_RESULT
              |SQL_CACHE
              |SQL_NO_CACHE
              |SQL_CALC_FOUND_ROWS
           )\s+
      /SELECT /xgi;
      ($cols_def) = $query =~ m/^SELECT\s+(.+?)\s+FROM/i;
   }
   elsif ( $query =~ m/^(?:INSERT|REPLACE)/i ) {
      ($cols_def) = $query =~ m/\(([^\)]+)\)\s*VALUE/i;
   }

   MKDEBUG && _d('Columns:', $cols_def);
   if ( $cols_def ) {
      @$cols = split(',', $cols_def);
      map {
         my $col = $_;
         $col = s/^\s+//g;
         $col = s/\s+$//g;
         $col;
      } @$cols;
   }

   return $cols;
}

sub parse {
   my ( $self, $query ) = @_;
   return unless $query;
   my $parsed = {};

   $query =~ s/\n/ /g;
   $query = $self->clean_query($query);

   $parsed->{query}   = $query,
   $parsed->{tables}  = $self->get_aliases($query, 1);
   $parsed->{columns} = $self->get_columns($query);

   my ($type) = $query =~ m/^(\w+)/;
   $parsed->{type} = lc $type;


   $parsed->{sub_queries} = [];

   return $parsed;
}

sub extract_tables {
   my ( $self, %args ) = @_;
   my $query      = $args{query};
   my $default_db = $args{default_db};
   my $q          = $self->{Quoter} || $args{Quoter};
   return unless $query;
   MKDEBUG && _d('Extracting tables');
   my @tables;
   my %seen;
   foreach my $db_tbl ( $self->get_tables($query) ) {
      next unless $db_tbl;
      next if $seen{$db_tbl}++; # Unique-ify for issue 337.
      my ( $db, $tbl ) = $q->split_unquote($db_tbl);
      push @tables, [ $db || $default_db, $tbl ];
   }
   return @tables;
}

sub trim_identifier {
   my ($self, $str) = @_;
   return unless defined $str;
   $str =~ s/`//g;
   $str =~ s/^\s+//;
   $str =~ s/\s+$//;
   return $str;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End QueryParser package
# ###########################################################################

# ###########################################################################
# MySQLDump package 6345
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/MySQLDump.pm
#   trunk/common/t/MySQLDump.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package MySQLDump;

use strict;
use warnings FATAL => 'all';

use English qw(-no_match_vars);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

( our $before = <<'EOF') =~ s/^   //gm;
   /*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
   /*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
   /*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
   /*!40101 SET NAMES utf8 */;
   /*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
   /*!40103 SET TIME_ZONE='+00:00' */;
   /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
   /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
   /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
   /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
EOF

( our $after = <<'EOF') =~ s/^   //gm;
   /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
   /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
   /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
   /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
   /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
   /*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
   /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
   /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
EOF

sub new {
   my ( $class, %args ) = @_;
   my $self = {
      cache => 0,  # Afaik no script uses this cache any longer because
   };
   return bless $self, $class;
}

sub dump {
   my ( $self, $dbh, $quoter, $db, $tbl, $what ) = @_;

   if ( $what eq 'table' ) {
      my $ddl = $self->get_create_table($dbh, $quoter, $db, $tbl);
      return unless $ddl;
      if ( $ddl->[0] eq 'table' ) {
         return $before
            . 'DROP TABLE IF EXISTS ' . $quoter->quote($tbl) . ";\n"
            . $ddl->[1] . ";\n";
      }
      else {
         return 'DROP TABLE IF EXISTS ' . $quoter->quote($tbl) . ";\n"
            . '/*!50001 DROP VIEW IF EXISTS '
            . $quoter->quote($tbl) . "*/;\n/*!50001 "
            . $self->get_tmp_table($dbh, $quoter, $db, $tbl) . "*/;\n";
      }
   }
   elsif ( $what eq 'triggers' ) {
      my $trgs = $self->get_triggers($dbh, $quoter, $db, $tbl);
      if ( $trgs && @$trgs ) {
         my $result = $before . "\nDELIMITER ;;\n";
         foreach my $trg ( @$trgs ) {
            if ( $trg->{sql_mode} ) {
               $result .= qq{/*!50003 SET SESSION SQL_MODE='$trg->{sql_mode}' */;;\n};
            }
            $result .= "/*!50003 CREATE */ ";
            if ( $trg->{definer} ) {
               my ( $user, $host )
                  = map { s/'/''/g; "'$_'"; }
                    split('@', $trg->{definer}, 2);
               $result .= "/*!50017 DEFINER=$user\@$host */ ";
            }
            $result .= sprintf("/*!50003 TRIGGER %s %s %s ON %s\nFOR EACH ROW %s */;;\n\n",
               $quoter->quote($trg->{trigger}),
               @{$trg}{qw(timing event)},
               $quoter->quote($trg->{table}),
               $trg->{statement});
         }
         $result .= "DELIMITER ;\n\n/*!50003 SET SESSION SQL_MODE=\@OLD_SQL_MODE */;\n\n";
         return $result;
      }
      else {
         return undef;
      }
   }
   elsif ( $what eq 'view' ) {
      my $ddl = $self->get_create_table($dbh, $quoter, $db, $tbl);
      return '/*!50001 DROP TABLE IF EXISTS ' . $quoter->quote($tbl) . "*/;\n"
         . '/*!50001 DROP VIEW IF EXISTS ' . $quoter->quote($tbl) . "*/;\n"
         . '/*!50001 ' . $ddl->[1] . "*/;\n";
   }
   else {
      die "You didn't say what to dump.";
   }
}

sub _use_db {
   my ( $self, $dbh, $quoter, $new ) = @_;
   if ( !$new ) {
      MKDEBUG && _d('No new DB to use');
      return;
   }
   my $sql = 'USE ' . $quoter->quote($new);
   MKDEBUG && _d($dbh, $sql);
   $dbh->do($sql);
   return;
}

sub get_create_table {
   my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
   if ( !$self->{cache} || !$self->{tables}->{$db}->{$tbl} ) {
      my $sql = '/*!40101 SET @OLD_SQL_MODE := @@SQL_MODE, '
         . q{@@SQL_MODE := REPLACE(REPLACE(@@SQL_MODE, 'ANSI_QUOTES', ''), ',,', ','), }
         . '@OLD_QUOTE := @@SQL_QUOTE_SHOW_CREATE, '
         . '@@SQL_QUOTE_SHOW_CREATE := 1 */';
      MKDEBUG && _d($sql);
      eval { $dbh->do($sql); };
      MKDEBUG && $EVAL_ERROR && _d($EVAL_ERROR);
      $self->_use_db($dbh, $quoter, $db);
      $sql = "SHOW CREATE TABLE " . $quoter->quote($db, $tbl);
      MKDEBUG && _d($sql);
      my $href;
      eval { $href = $dbh->selectrow_hashref($sql); };
      if ( $EVAL_ERROR ) {
         warn "Failed to $sql.  The table may be damaged.\nError: $EVAL_ERROR";
         return;
      }

      $sql = '/*!40101 SET @@SQL_MODE := @OLD_SQL_MODE, '
         . '@@SQL_QUOTE_SHOW_CREATE := @OLD_QUOTE */';
      MKDEBUG && _d($sql);
      $dbh->do($sql);
      my ($key) = grep { m/create table/i } keys %$href;
      if ( $key ) {
         MKDEBUG && _d('This table is a base table');
         $self->{tables}->{$db}->{$tbl} = [ 'table', $href->{$key} ];
      }
      else {
         MKDEBUG && _d('This table is a view');
         ($key) = grep { m/create view/i } keys %$href;
         $self->{tables}->{$db}->{$tbl} = [ 'view', $href->{$key} ];
      }
   }
   return $self->{tables}->{$db}->{$tbl};
}

sub get_columns {
   my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
   MKDEBUG && _d('Get columns for', $db, $tbl);
   if ( !$self->{cache} || !$self->{columns}->{$db}->{$tbl} ) {
      $self->_use_db($dbh, $quoter, $db);
      my $sql = "SHOW COLUMNS FROM " . $quoter->quote($db, $tbl);
      MKDEBUG && _d($sql);
      my $cols = $dbh->selectall_arrayref($sql, { Slice => {} });

      $self->{columns}->{$db}->{$tbl} = [
         map {
            my %row;
            @row{ map { lc $_ } keys %$_ } = values %$_;
            \%row;
         } @$cols
      ];
   }
   return $self->{columns}->{$db}->{$tbl};
}

sub get_tmp_table {
   my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
   my $result = 'CREATE TABLE ' . $quoter->quote($tbl) . " (\n";
   $result .= join(",\n",
      map { '  ' . $quoter->quote($_->{field}) . ' ' . $_->{type} }
      @{$self->get_columns($dbh, $quoter, $db, $tbl)});
   $result .= "\n)";
   MKDEBUG && _d($result);
   return $result;
}

sub get_triggers {
   my ( $self, $dbh, $quoter, $db, $tbl ) = @_;
   if ( !$self->{cache} || !$self->{triggers}->{$db} ) {
      $self->{triggers}->{$db} = {};
      my $sql = '/*!40101 SET @OLD_SQL_MODE := @@SQL_MODE, '
         . q{@@SQL_MODE := REPLACE(REPLACE(@@SQL_MODE, 'ANSI_QUOTES', ''), ',,', ','), }
         . '@OLD_QUOTE := @@SQL_QUOTE_SHOW_CREATE, '
         . '@@SQL_QUOTE_SHOW_CREATE := 1 */';
      MKDEBUG && _d($sql);
      eval { $dbh->do($sql); };
      MKDEBUG && $EVAL_ERROR && _d($EVAL_ERROR);
      $sql = "SHOW TRIGGERS FROM " . $quoter->quote($db);
      MKDEBUG && _d($sql);
      my $sth = $dbh->prepare($sql);
      $sth->execute();
      if ( $sth->rows ) {
         my $trgs = $sth->fetchall_arrayref({});
         foreach my $trg (@$trgs) {
            my %trg;
            @trg{ map { lc $_ } keys %$trg } = values %$trg;
            push @{ $self->{triggers}->{$db}->{ $trg{table} } }, \%trg;
         }
      }
      $sql = '/*!40101 SET @@SQL_MODE := @OLD_SQL_MODE, '
         . '@@SQL_QUOTE_SHOW_CREATE := @OLD_QUOTE */';
      MKDEBUG && _d($sql);
      $dbh->do($sql);
   }
   if ( $tbl ) {
      return $self->{triggers}->{$db}->{$tbl};
   }
   return values %{$self->{triggers}->{$db}};
}

sub get_databases {
   my ( $self, $dbh, $quoter, $like ) = @_;
   if ( !$self->{cache} || !$self->{databases} || $like ) {
      my $sql = 'SHOW DATABASES';
      my @params;
      if ( $like ) {
         $sql .= ' LIKE ?';
         push @params, $like;
      }
      my $sth = $dbh->prepare($sql);
      MKDEBUG && _d($sql, @params);
      $sth->execute( @params );
      my @dbs = map { $_->[0] } @{$sth->fetchall_arrayref()};
      $self->{databases} = \@dbs unless $like;
      return @dbs;
   }
   return @{$self->{databases}};
}

sub get_table_status {
   my ( $self, $dbh, $quoter, $db, $like ) = @_;
   if ( !$self->{cache} || !$self->{table_status}->{$db} || $like ) {
      my $sql = "SHOW TABLE STATUS FROM " . $quoter->quote($db);
      my @params;
      if ( $like ) {
         $sql .= ' LIKE ?';
         push @params, $like;
      }
      MKDEBUG && _d($sql, @params);
      my $sth = $dbh->prepare($sql);
      $sth->execute(@params);
      my @tables = @{$sth->fetchall_arrayref({})};
      @tables = map {
         my %tbl; # Make a copy with lowercased keys
         @tbl{ map { lc $_ } keys %$_ } = values %$_;
         $tbl{engine} ||= $tbl{type} || $tbl{comment};
         delete $tbl{type};
         \%tbl;
      } @tables;
      $self->{table_status}->{$db} = \@tables unless $like;
      return @tables;
   }
   return @{$self->{table_status}->{$db}};
}

sub get_table_list {
   my ( $self, $dbh, $quoter, $db, $like ) = @_;
   if ( !$self->{cache} || !$self->{table_list}->{$db} || $like ) {
      my $sql = "SHOW /*!50002 FULL*/ TABLES FROM " . $quoter->quote($db);
      my @params;
      if ( $like ) {
         $sql .= ' LIKE ?';
         push @params, $like;
      }
      MKDEBUG && _d($sql, @params);
      my $sth = $dbh->prepare($sql);
      $sth->execute(@params);
      my @tables = @{$sth->fetchall_arrayref()};
      @tables = map {
         my %tbl = (
            name   => $_->[0],
            engine => ($_->[1] || '') eq 'VIEW' ? 'VIEW' : '',
         );
         \%tbl;
      } @tables;
      $self->{table_list}->{$db} = \@tables unless $like;
      return @tables;
   }
   return @{$self->{table_list}->{$db}};
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End MySQLDump package
# ###########################################################################

# ###########################################################################
# TableParser package 7156
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/TableParser.pm
#   trunk/common/t/TableParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package TableParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my @required_args = qw(Quoter);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $self = { %args };
   return bless $self, $class;
}

sub parse {
   my ( $self, $ddl, $opts ) = @_;
   return unless $ddl;
   if ( ref $ddl eq 'ARRAY' ) {
      if ( lc $ddl->[0] eq 'table' ) {
         $ddl = $ddl->[1];
      }
      else {
         return {
            engine => 'VIEW',
         };
      }
   }

   if ( $ddl !~ m/CREATE (?:TEMPORARY )?TABLE `/ ) {
      die "Cannot parse table definition; is ANSI quoting "
         . "enabled or SQL_QUOTE_SHOW_CREATE disabled?";
   }

   my ($name)     = $ddl =~ m/CREATE (?:TEMPORARY )?TABLE\s+(`.+?`)/;
   (undef, $name) = $self->{Quoter}->split_unquote($name) if $name;

   $ddl =~ s/(`[^`]+`)/\L$1/g;

   my $engine = $self->get_engine($ddl);

   my @defs   = $ddl =~ m/^(\s+`.*?),?$/gm;
   my @cols   = map { $_ =~ m/`([^`]+)`/ } @defs;
   MKDEBUG && _d('Table cols:', join(', ', map { "`$_`" } @cols));

   my %def_for;
   @def_for{@cols} = @defs;

   my (@nums, @null);
   my (%type_for, %is_nullable, %is_numeric, %is_autoinc);
   foreach my $col ( @cols ) {
      my $def = $def_for{$col};
      my ( $type ) = $def =~ m/`[^`]+`\s([a-z]+)/;
      die "Can't determine column type for $def" unless $type;
      $type_for{$col} = $type;
      if ( $type =~ m/(?:(?:tiny|big|medium|small)?int|float|double|decimal|year)/ ) {
         push @nums, $col;
         $is_numeric{$col} = 1;
      }
      if ( $def !~ m/NOT NULL/ ) {
         push @null, $col;
         $is_nullable{$col} = 1;
      }
      $is_autoinc{$col} = $def =~ m/AUTO_INCREMENT/i ? 1 : 0;
   }

   my ($keys, $clustered_key) = $self->get_keys($ddl, $opts, \%is_nullable);

   my ($charset) = $ddl =~ m/DEFAULT CHARSET=(\w+)/;

   return {
      name           => $name,
      cols           => \@cols,
      col_posn       => { map { $cols[$_] => $_ } 0..$#cols },
      is_col         => { map { $_ => 1 } @cols },
      null_cols      => \@null,
      is_nullable    => \%is_nullable,
      is_autoinc     => \%is_autoinc,
      clustered_key  => $clustered_key,
      keys           => $keys,
      defs           => \%def_for,
      numeric_cols   => \@nums,
      is_numeric     => \%is_numeric,
      engine         => $engine,
      type_for       => \%type_for,
      charset        => $charset,
   };
}

sub sort_indexes {
   my ( $self, $tbl ) = @_;

   my @indexes
      = sort {
         (($a ne 'PRIMARY') <=> ($b ne 'PRIMARY'))
         || ( !$tbl->{keys}->{$a}->{is_unique} <=> !$tbl->{keys}->{$b}->{is_unique} )
         || ( $tbl->{keys}->{$a}->{is_nullable} <=> $tbl->{keys}->{$b}->{is_nullable} )
         || ( scalar(@{$tbl->{keys}->{$a}->{cols}}) <=> scalar(@{$tbl->{keys}->{$b}->{cols}}) )
      }
      grep {
         $tbl->{keys}->{$_}->{type} eq 'BTREE'
      }
      sort keys %{$tbl->{keys}};

   MKDEBUG && _d('Indexes sorted best-first:', join(', ', @indexes));
   return @indexes;
}

sub find_best_index {
   my ( $self, $tbl, $index ) = @_;
   my $best;
   if ( $index ) {
      ($best) = grep { uc $_ eq uc $index } keys %{$tbl->{keys}};
   }
   if ( !$best ) {
      if ( $index ) {
         die "Index '$index' does not exist in table";
      }
      else {
         ($best) = $self->sort_indexes($tbl);
      }
   }
   MKDEBUG && _d('Best index found is', $best);
   return $best;
}

sub find_possible_keys {
   my ( $self, $dbh, $database, $table, $quoter, $where ) = @_;
   return () unless $where;
   my $sql = 'EXPLAIN SELECT * FROM ' . $quoter->quote($database, $table)
      . ' WHERE ' . $where;
   MKDEBUG && _d($sql);
   my $expl = $dbh->selectrow_hashref($sql);
   $expl = { map { lc($_) => $expl->{$_} } keys %$expl };
   if ( $expl->{possible_keys} ) {
      MKDEBUG && _d('possible_keys =', $expl->{possible_keys});
      my @candidates = split(',', $expl->{possible_keys});
      my %possible   = map { $_ => 1 } @candidates;
      if ( $expl->{key} ) {
         MKDEBUG && _d('MySQL chose', $expl->{key});
         unshift @candidates, grep { $possible{$_} } split(',', $expl->{key});
         MKDEBUG && _d('Before deduping:', join(', ', @candidates));
         my %seen;
         @candidates = grep { !$seen{$_}++ } @candidates;
      }
      MKDEBUG && _d('Final list:', join(', ', @candidates));
      return @candidates;
   }
   else {
      MKDEBUG && _d('No keys in possible_keys');
      return ();
   }
}

sub check_table {
   my ( $self, %args ) = @_;
   my @required_args = qw(dbh db tbl);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($dbh, $db, $tbl) = @args{@required_args};
   my $q      = $self->{Quoter};
   my $db_tbl = $q->quote($db, $tbl);
   MKDEBUG && _d('Checking', $db_tbl);

   my $sql = "SHOW TABLES FROM " . $q->quote($db)
           . ' LIKE ' . $q->literal_like($tbl);
   MKDEBUG && _d($sql);
   my $row;
   eval {
      $row = $dbh->selectrow_arrayref($sql);
   };
   if ( $EVAL_ERROR ) {
      MKDEBUG && _d($EVAL_ERROR);
      return 0;
   }
   if ( !$row->[0] || $row->[0] ne $tbl ) {
      MKDEBUG && _d('Table does not exist');
      return 0;
   }

   MKDEBUG && _d('Table exists; no privs to check');
   return 1 unless $args{all_privs};

   $sql = "SHOW FULL COLUMNS FROM $db_tbl";
   MKDEBUG && _d($sql);
   eval {
      $row = $dbh->selectrow_hashref($sql);
   };
   if ( $EVAL_ERROR ) {
      MKDEBUG && _d($EVAL_ERROR);
      return 0;
   }
   if ( !scalar keys %$row ) {
      MKDEBUG && _d('Table has no columns:', Dumper($row));
      return 0;
   }
   my $privs = $row->{privileges} || $row->{Privileges};

   $sql = "DELETE FROM $db_tbl LIMIT 0";
   MKDEBUG && _d($sql);
   eval {
      $dbh->do($sql);
   };
   my $can_delete = $EVAL_ERROR ? 0 : 1;

   MKDEBUG && _d('User privs on', $db_tbl, ':', $privs,
      ($can_delete ? 'delete' : ''));

   if ( !($privs =~ m/select/ && $privs =~ m/insert/ && $privs =~ m/update/
          && $can_delete) ) {
      MKDEBUG && _d('User does not have all privs');
      return 0;
   }

   MKDEBUG && _d('User has all privs');
   return 1;
}

sub get_engine {
   my ( $self, $ddl, $opts ) = @_;
   my ( $engine ) = $ddl =~ m/\).*?(?:ENGINE|TYPE)=(\w+)/;
   MKDEBUG && _d('Storage engine:', $engine);
   return $engine || undef;
}

sub get_keys {
   my ( $self, $ddl, $opts, $is_nullable ) = @_;
   my $engine        = $self->get_engine($ddl);
   my $keys          = {};
   my $clustered_key = undef;

   KEY:
   foreach my $key ( $ddl =~ m/^  ((?:[A-Z]+ )?KEY .*)$/gm ) {

      next KEY if $key =~ m/FOREIGN/;

      my $key_ddl = $key;
      MKDEBUG && _d('Parsed key:', $key_ddl);

      if ( $engine !~ m/MEMORY|HEAP/ ) {
         $key =~ s/USING HASH/USING BTREE/;
      }

      my ( $type, $cols ) = $key =~ m/(?:USING (\w+))? \((.+)\)/;
      my ( $special ) = $key =~ m/(FULLTEXT|SPATIAL)/;
      $type = $type || $special || 'BTREE';
      if ( $opts->{mysql_version} && $opts->{mysql_version} lt '004001000'
         && $engine =~ m/HEAP|MEMORY/i )
      {
         $type = 'HASH'; # MySQL pre-4.1 supports only HASH indexes on HEAP
      }

      my ($name) = $key =~ m/(PRIMARY|`[^`]*`)/;
      my $unique = $key =~ m/PRIMARY|UNIQUE/ ? 1 : 0;
      my @cols;
      my @col_prefixes;
      foreach my $col_def ( $cols =~ m/`[^`]+`(?:\(\d+\))?/g ) {
         my ($name, $prefix) = $col_def =~ m/`([^`]+)`(?:\((\d+)\))?/;
         push @cols, $name;
         push @col_prefixes, $prefix;
      }
      $name =~ s/`//g;

      MKDEBUG && _d( $name, 'key cols:', join(', ', map { "`$_`" } @cols));

      $keys->{$name} = {
         name         => $name,
         type         => $type,
         colnames     => $cols,
         cols         => \@cols,
         col_prefixes => \@col_prefixes,
         is_unique    => $unique,
         is_nullable  => scalar(grep { $is_nullable->{$_} } @cols),
         is_col       => { map { $_ => 1 } @cols },
         ddl          => $key_ddl,
      };

      if ( $engine =~ m/InnoDB/i && !$clustered_key ) {
         my $this_key = $keys->{$name};
         if ( $this_key->{name} eq 'PRIMARY' ) {
            $clustered_key = 'PRIMARY';
         }
         elsif ( $this_key->{is_unique} && !$this_key->{is_nullable} ) {
            $clustered_key = $this_key->{name};
         }
         MKDEBUG && $clustered_key && _d('This key is the clustered key');
      }
   }

   return $keys, $clustered_key;
}

sub get_fks {
   my ( $self, $ddl, $opts ) = @_;
   my $fks = {};

   foreach my $fk (
      $ddl =~ m/CONSTRAINT .* FOREIGN KEY .* REFERENCES [^\)]*\)/mg )
   {
      my ( $name ) = $fk =~ m/CONSTRAINT `(.*?)`/;
      my ( $cols ) = $fk =~ m/FOREIGN KEY \(([^\)]+)\)/;
      my ( $parent, $parent_cols ) = $fk =~ m/REFERENCES (\S+) \(([^\)]+)\)/;

      if ( $parent !~ m/\./ && $opts->{database} ) {
         $parent = "`$opts->{database}`.$parent";
      }

      $fks->{$name} = {
         name           => $name,
         colnames       => $cols,
         cols           => [ map { s/[ `]+//g; $_; } split(',', $cols) ],
         parent_tbl     => $parent,
         parent_colnames=> $parent_cols,
         parent_cols    => [ map { s/[ `]+//g; $_; } split(',', $parent_cols) ],
         ddl            => $fk,
      };
   }

   return $fks;
}

sub remove_auto_increment {
   my ( $self, $ddl ) = @_;
   $ddl =~ s/(^\).*?) AUTO_INCREMENT=\d+\b/$1/m;
   return $ddl;
}

sub remove_secondary_indexes {
   my ( $self, $ddl ) = @_;
   my $sec_indexes_ddl;
   my $tbl_struct = $self->parse($ddl);

   if ( ($tbl_struct->{engine} || '') =~ m/InnoDB/i ) {
      my $clustered_key = $tbl_struct->{clustered_key};
      $clustered_key  ||= '';

      my @sec_indexes   = map {
         my $key_def = $_->{ddl};
         $key_def =~ s/([\(\)])/\\$1/g;
         $ddl =~ s/\s+$key_def//i;

         my $key_ddl = "ADD $_->{ddl}";
         $key_ddl   .= ',' unless $key_ddl =~ m/,$/;
         $key_ddl;
      }
      grep { $_->{name} ne $clustered_key }
      values %{$tbl_struct->{keys}};
      MKDEBUG && _d('Secondary indexes:', Dumper(\@sec_indexes));

      if ( @sec_indexes ) {
         $sec_indexes_ddl = join(' ', @sec_indexes);
         $sec_indexes_ddl =~ s/,$//;
      }

      $ddl =~ s/,(\n\) )/$1/s;
   }
   else {
      MKDEBUG && _d('Not removing secondary indexes from',
         $tbl_struct->{engine}, 'table');
   }

   return $ddl, $sec_indexes_ddl, $tbl_struct;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End TableParser package
# ###########################################################################

# ###########################################################################
# QueryReview package 7342
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/QueryReview.pm
#   trunk/common/t/QueryReview.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package QueryReview;


use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
Transformers->import(qw(make_checksum parse_timestamp));

use Data::Dumper;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

my %basic_cols = map { $_ => 1 }
   qw(checksum fingerprint sample first_seen last_seen reviewed_by
      reviewed_on comments);
my %skip_cols  = map { $_ => 1 } qw(fingerprint sample checksum);

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(dbh db_tbl tbl_struct quoter) ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   foreach my $col ( keys %basic_cols ) {
      die "Query review table $args{db_tbl} does not have a $col column"
         unless $args{tbl_struct}->{is_col}->{$col};
   }

   my $now = defined $args{ts_default} ? $args{ts_default} : 'NOW()';

   my $sql = <<"      SQL";
      INSERT INTO $args{db_tbl}
      (checksum, fingerprint, sample, first_seen, last_seen)
      VALUES(CONV(?, 16, 10), ?, ?, COALESCE(?, $now), COALESCE(?, $now))
      ON DUPLICATE KEY UPDATE
         first_seen = IF(
            first_seen IS NULL,
            COALESCE(?, $now),
            LEAST(first_seen, COALESCE(?, $now))),
         last_seen = IF(
            last_seen IS NULL,
            COALESCE(?, $now),
            GREATEST(last_seen, COALESCE(?, $now)))
      SQL
   MKDEBUG && _d('SQL to insert into review table:', $sql);
   my $insert_sth = $args{dbh}->prepare($sql);

   my @review_cols = grep { !$skip_cols{$_} } @{$args{tbl_struct}->{cols}};
   $sql = "SELECT "
        . join(', ', map { $args{quoter}->quote($_) } @review_cols)
        . ", CONV(checksum, 10, 16) AS checksum_conv FROM $args{db_tbl}"
        . " WHERE checksum=CONV(?, 16, 10)";
   MKDEBUG && _d('SQL to select from review table:', $sql);
   my $select_sth = $args{dbh}->prepare($sql);

   my $self = {
      dbh         => $args{dbh},
      db_tbl      => $args{db_tbl},
      insert_sth  => $insert_sth,
      select_sth  => $select_sth,
      tbl_struct  => $args{tbl_struct},
      quoter      => $args{quoter},
      ts_default  => $now,
   };
   return bless $self, $class;
}

sub set_history_options {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(table dbh tbl_struct col_pat) ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   my @cols;
   my @metrics;
   foreach my $col ( @{$args{tbl_struct}->{cols}} ) {
      my ( $attr, $metric ) = $col =~ m/$args{col_pat}/;
      next unless $attr && $metric;


      $attr = ucfirst $attr if $attr =~ m/_/;
      $attr = 'Filesort' if $attr eq 'filesort';

      $attr =~ s/^Qc_hit/QC_Hit/;  # Qc_hit is really QC_Hit
      $attr =~ s/^Innodb/InnoDB/g; # Innodb is really InnoDB
      $attr =~ s/_io_/_IO_/g;      # io is really IO

      push @cols, $col;
      push @metrics, [$attr, $metric];
   }

   my $sql = "REPLACE INTO $args{table}("
      . join(', ',
         map { $self->{quoter}->quote($_) } ('checksum', 'sample', @cols))
      . ') VALUES (CONV(?, 16, 10), ?'
      . (@cols ? ', ' : '')  # issue 1265
      . join(', ', map {
         $_ eq 'ts_min' || $_ eq 'ts_max'
            ? "COALESCE(?, $self->{ts_default})"
            : '?'
        } @cols) . ')';
   MKDEBUG && _d($sql);

   $self->{history_sth}     = $args{dbh}->prepare($sql);
   $self->{history_metrics} = \@metrics;

   return;
}

sub set_review_history {
   my ( $self, $id, $sample, %data ) = @_;
   foreach my $thing ( qw(min max) ) {
      next unless defined $data{ts} && defined $data{ts}->{$thing};
      $data{ts}->{$thing} = parse_timestamp($data{ts}->{$thing});
   }
   $self->{history_sth}->execute(
      make_checksum($id),
      $sample,
      map { $data{$_->[0]}->{$_->[1]} } @{$self->{history_metrics}});
}

sub get_review_info {
   my ( $self, $id ) = @_;
   $self->{select_sth}->execute(make_checksum($id));
   my $review_vals = $self->{select_sth}->fetchall_arrayref({});
   if ( $review_vals && @$review_vals == 1 ) {
      return $review_vals->[0];
   }
   return undef;
}

sub set_review_info {
   my ( $self, %args ) = @_;
   $self->{insert_sth}->execute(
      make_checksum($args{fingerprint}),
      @args{qw(fingerprint sample)},
      map { $args{$_} ? parse_timestamp($args{$_}) : undef }
         qw(first_seen last_seen first_seen first_seen last_seen last_seen));
}

sub review_cols {
   my ( $self ) = @_;
   return grep { !$skip_cols{$_} } @{$self->{tbl_struct}->{cols}};
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;
# ###########################################################################
# End QueryReview package
# ###########################################################################

# ###########################################################################
# Daemon package 6255
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Daemon.pm
#   trunk/common/t/Daemon.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package Daemon;

use strict;
use warnings FATAL => 'all';

use POSIX qw(setsid);
use English qw(-no_match_vars);

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(o) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $o = $args{o};
   my $self = {
      o        => $o,
      log_file => $o->has('log') ? $o->get('log') : undef,
      PID_file => $o->has('pid') ? $o->get('pid') : undef,
   };

   check_PID_file(undef, $self->{PID_file});

   MKDEBUG && _d('Daemonized child will log to', $self->{log_file});
   return bless $self, $class;
}

sub daemonize {
   my ( $self ) = @_;

   MKDEBUG && _d('About to fork and daemonize');
   defined (my $pid = fork()) or die "Cannot fork: $OS_ERROR";
   if ( $pid ) {
      MKDEBUG && _d('I am the parent and now I die');
      exit;
   }

   $self->{PID_owner} = $PID;
   $self->{child}     = 1;

   POSIX::setsid() or die "Cannot start a new session: $OS_ERROR";
   chdir '/'       or die "Cannot chdir to /: $OS_ERROR";

   $self->_make_PID_file();

   $OUTPUT_AUTOFLUSH = 1;

   if ( -t STDIN ) {
      close STDIN;
      open  STDIN, '/dev/null'
         or die "Cannot reopen STDIN to /dev/null: $OS_ERROR";
   }

   if ( $self->{log_file} ) {
      close STDOUT;
      open  STDOUT, '>>', $self->{log_file}
         or die "Cannot open log file $self->{log_file}: $OS_ERROR";

      close STDERR;
      open  STDERR, ">&STDOUT"
         or die "Cannot dupe STDERR to STDOUT: $OS_ERROR"; 
   }
   else {
      if ( -t STDOUT ) {
         close STDOUT;
         open  STDOUT, '>', '/dev/null'
            or die "Cannot reopen STDOUT to /dev/null: $OS_ERROR";
      }
      if ( -t STDERR ) {
         close STDERR;
         open  STDERR, '>', '/dev/null'
            or die "Cannot reopen STDERR to /dev/null: $OS_ERROR";
      }
   }

   MKDEBUG && _d('I am the child and now I live daemonized');
   return;
}

sub check_PID_file {
   my ( $self, $file ) = @_;
   my $PID_file = $self ? $self->{PID_file} : $file;
   MKDEBUG && _d('Checking PID file', $PID_file);
   if ( $PID_file && -f $PID_file ) {
      my $pid;
      eval { chomp($pid = `cat $PID_file`); };
      die "Cannot cat $PID_file: $OS_ERROR" if $EVAL_ERROR;
      MKDEBUG && _d('PID file exists; it contains PID', $pid);
      if ( $pid ) {
         my $pid_is_alive = kill 0, $pid;
         if ( $pid_is_alive ) {
            die "The PID file $PID_file already exists "
               . " and the PID that it contains, $pid, is running";
         }
         else {
            warn "Overwriting PID file $PID_file because the PID that it "
               . "contains, $pid, is not running";
         }
      }
      else {
         die "The PID file $PID_file already exists but it does not "
            . "contain a PID";
      }
   }
   else {
      MKDEBUG && _d('No PID file');
   }
   return;
}

sub make_PID_file {
   my ( $self ) = @_;
   if ( exists $self->{child} ) {
      die "Do not call Daemon::make_PID_file() for daemonized scripts";
   }
   $self->_make_PID_file();
   $self->{PID_owner} = $PID;
   return;
}

sub _make_PID_file {
   my ( $self ) = @_;

   my $PID_file = $self->{PID_file};
   if ( !$PID_file ) {
      MKDEBUG && _d('No PID file to create');
      return;
   }

   $self->check_PID_file();

   open my $PID_FH, '>', $PID_file
      or die "Cannot open PID file $PID_file: $OS_ERROR";
   print $PID_FH $PID
      or die "Cannot print to PID file $PID_file: $OS_ERROR";
   close $PID_FH
      or die "Cannot close PID file $PID_file: $OS_ERROR";

   MKDEBUG && _d('Created PID file:', $self->{PID_file});
   return;
}

sub _remove_PID_file {
   my ( $self ) = @_;
   if ( $self->{PID_file} && -f $self->{PID_file} ) {
      unlink $self->{PID_file}
         or warn "Cannot remove PID file $self->{PID_file}: $OS_ERROR";
      MKDEBUG && _d('Removed PID file');
   }
   else {
      MKDEBUG && _d('No PID to remove');
   }
   return;
}

sub DESTROY {
   my ( $self ) = @_;

   $self->_remove_PID_file() if ($self->{PID_owner} || 0) == $PID;

   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End Daemon package
# ###########################################################################

# ###########################################################################
# MemcachedProtocolParser package 7521
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/MemcachedProtocolParser.pm
#   trunk/common/t/MemcachedProtocolParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package MemcachedProtocolParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;

   my $self = {
      server      => $args{server},
      port        => $args{port} || '11211',
      sessions    => {},
      o           => $args{o},
   };
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(event);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $packet = @args{@required_args};

   if ( $packet->{data_len} == 0 ) {
      MKDEBUG && _d('No TCP data');
      $args{stats}->{no_tcp_data}++ if $args{stats};
      return;
   }

   my $src_host = "$packet->{src_host}:$packet->{src_port}";
   my $dst_host = "$packet->{dst_host}:$packet->{dst_port}";

   if ( my $server = $self->{server} ) {  # Watch only the given server.
      $server .= ":$self->{port}";
      if ( $src_host ne $server && $dst_host ne $server ) {
         MKDEBUG && _d('Packet is not to or from', $server);
         $args{stats}->{not_watched_server}++ if $args{stats};
         return;
      }
   }

   my $packet_from;
   my $client;
   if ( $src_host =~ m/:$self->{port}$/ ) {
      $packet_from = 'server';
      $client      = $dst_host;
   }
   elsif ( $dst_host =~ m/:$self->{port}$/ ) {
      $packet_from = 'client';
      $client      = $src_host;
   }
   else {
      warn 'Packet is not to or from memcached server: ', Dumper($packet);
      return;
   }
   MKDEBUG && _d('Client:', $client);

   if ( !exists $self->{sessions}->{$client} ) {
      MKDEBUG && _d('New session');
      $self->{sessions}->{$client} = {
         client      => $client,
         state       => undef,
         raw_packets => [],
      };
   };
   my $session = $self->{sessions}->{$client};

   push @{$session->{raw_packets}}, $packet->{raw_packet};

   $packet->{data} = pack('H*', $packet->{data});
   my $event;
   if ( $packet_from eq 'server' ) {
      $event = $self->_packet_from_server($packet, $session, %args);
   }
   elsif ( $packet_from eq 'client' ) {
      $event = $self->_packet_from_client($packet, $session, %args);
   }
   else {
      $args{stats}->{unknown_packet_origin}++ if $args{stats};
      die 'Packet origin unknown';
   }

   MKDEBUG && _d('Done with packet; event:', Dumper($event));
   $args{stats}->{events_parsed}++ if $args{stats};
   return $event;
}

sub _packet_from_server {
   my ( $self, $packet, $session, %args ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;

   MKDEBUG && _d('Packet is from server; client state:', $session->{state}); 

   my $data = $packet->{data};

   if ( !$session->{state} ) {
      MKDEBUG && _d('Ignoring mid-stream server response');
      $args{stats}->{ignored_midstream_server_response}++ if $args{stats};
      return;
   }

   if ( $session->{state} eq 'awaiting reply' ) {
      MKDEBUG && _d('State is awaiting reply');
      my ($line1, $rest) = $packet->{data} =~ m/\A(.*?)\r\n(.*)?/s;
      if ( !$line1 ) {
         $args{stats}->{unknown_server_data}++ if $args{stats};
         die "Unknown memcached data from server";
      }

      my @vals = $line1 =~ m/(\S+)/g;
      $session->{res} = shift @vals;
      MKDEBUG && _d('Result of last', $session->{cmd}, 'cmd:', $session->{res});

      if ( $session->{cmd} eq 'incr' || $session->{cmd} eq 'decr' ) {
         MKDEBUG && _d('It is an incr or decr');
         if ( $session->{res} !~ m/\D/ ) { # It's an integer, not an error
            MKDEBUG && _d('Got a value for the incr/decr');
            $session->{val} = $session->{res};
            $session->{res} = '';
         }
      }
      elsif ( $session->{res} eq 'VALUE' ) {
         MKDEBUG && _d('It is the result of a "get"');
         my ($key, $flags, $bytes) = @vals;
         defined $session->{flags} or $session->{flags} = $flags;
         defined $session->{bytes} or $session->{bytes} = $bytes;

         if ( $rest && $bytes ) {
            MKDEBUG && _d('There is a value');
            if ( length($rest) > $bytes ) {
               MKDEBUG && _d('Got complete response');
               $session->{val} = substr($rest, 0, $bytes);
            }
            else {
               MKDEBUG && _d('Got partial response, saving for later');
               push @{$session->{partial}}, [ $packet->{seq}, $rest ];
               $session->{gathered} += length($rest);
               $session->{state} = 'partial recv';
               return; # Prevent firing an event.
            }
         }
      }
      elsif ( $session->{res} eq 'END' ) {
         MKDEBUG && _d('Got an END without any data, firing NOT_FOUND');
         $session->{res} = 'NOT_FOUND';
      }
      elsif ( $session->{res} !~ m/STORED|DELETED|NOT_FOUND/ ) {
         MKDEBUG && _d('Unknown result');
      }
      else {
         $args{stats}->{unknown_server_response}++ if $args{stats};
      }
   }
   else { # Should be 'partial recv'
      MKDEBUG && _d('Session state: ', $session->{state});
      push @{$session->{partial}}, [ $packet->{seq}, $data ];
      $session->{gathered} += length($data);
      MKDEBUG && _d('Gathered', $session->{gathered}, 'bytes in',
         scalar(@{$session->{partial}}), 'packets from server');
      if ( $session->{gathered} >= $session->{bytes} + 2 ) { # Done.
         MKDEBUG && _d('End of partial response, preparing event');
         my $val = join('',
            map  { $_->[1] }
            sort { $a->[0] <=> $b->[0] }
                 @{$session->{partial}});
         $session->{val} = substr($val, 0, $session->{bytes});
      }
      else {
         MKDEBUG && _d('Partial response continues, no action');
         return; # Prevent firing event.
      }
   }

   MKDEBUG && _d('Creating event, deleting session');
   my $event = make_event($session, $packet);
   delete $self->{sessions}->{$session->{client}}; # memcached is stateless!
   $session->{raw_packets} = []; # Avoid keeping forever
   return $event;
}

sub _packet_from_client {
   my ( $self, $packet, $session, %args ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;

   MKDEBUG && _d('Packet is from client; state:', $session->{state});

   my $event;
   if ( ($session->{state} || '') =~m/awaiting reply|partial recv/ ) {
      MKDEBUG && _d("Expected data from the client, looks like interrupted");
      $session->{res} = 'INTERRUPTED';
      $event = make_event($session, $packet);
      my $client = $session->{client};
      delete @{$session}{keys %$session};
      $session->{client} = $client;
   }

   my ($line1, $val);
   my ($cmd, $key, $flags, $exptime, $bytes);
   
   if ( !$session->{state} ) {
      MKDEBUG && _d('Session state: ', $session->{state});
      ($line1, $val) = $packet->{data} =~ m/\A(.*?)\r\n(.+)?/s;
      if ( !$line1 ) {
         MKDEBUG && _d('Unknown memcached data from client, skipping packet');
         $args{stats}->{unknown_client_data}++ if $args{stats};
         return;
      }

      my @vals = $line1 =~ m/(\S+)/g;
      $cmd = lc shift @vals;
      MKDEBUG && _d('$cmd is a ', $cmd);
      if ( $cmd eq 'set' || $cmd eq 'add' || $cmd eq 'replace' ) {
         ($key, $flags, $exptime, $bytes) = @vals;
         $session->{bytes} = $bytes;
      }
      elsif ( $cmd eq 'get' ) {
         ($key) = @vals;
         if ( $val ) {
            MKDEBUG && _d('Multiple cmds:', $val);
            $val = undef;
         }
      }
      elsif ( $cmd eq 'delete' ) {
         ($key) = @vals; # TODO: handle the <queue_time>
         if ( $val ) {
            MKDEBUG && _d('Multiple cmds:', $val);
            $val = undef;
         }
      }
      elsif ( $cmd eq 'incr' || $cmd eq 'decr' ) {
         ($key) = @vals;
      }
      else {
         MKDEBUG && _d("Don't know how to handle", $cmd, "command");
         $args{stats}->{unknown_client_command}++ if $args{stats};
         return;
      }

      @{$session}{qw(cmd key flags exptime)}
         = ($cmd, $key, $flags, $exptime);
      $session->{host}       = $packet->{src_host};
      $session->{pos_in_log} = $packet->{pos_in_log};
      $session->{ts}         = $packet->{ts};
   }
   else {
      MKDEBUG && _d('Session state: ', $session->{state});
      $val = $packet->{data};
   }

   $session->{state} = 'awaiting reply'; # Assume we got the whole packet
   if ( $val ) {
      if ( $session->{bytes} + 2 == length($val) ) { # +2 for the \r\n
         MKDEBUG && _d('Complete send');
         $val =~ s/\r\n\Z//; # We got the whole thing.
         $session->{val} = $val;
      }
      else { # We apparently did NOT get the whole thing.
         MKDEBUG && _d('Partial send, saving for later');
         push @{$session->{partial}},
            [ $packet->{seq}, $val ];
         $session->{gathered} += length($val);
         MKDEBUG && _d('Gathered', $session->{gathered}, 'bytes in',
            scalar(@{$session->{partial}}), 'packets from client');
         if ( $session->{gathered} >= $session->{bytes} + 2 ) { # Done.
            MKDEBUG && _d('Message looks complete now, saving value');
            $val = join('',
               map  { $_->[1] }
               sort { $a->[0] <=> $b->[0] }
                    @{$session->{partial}});
            $val =~ s/\r\n\Z//;
            $session->{val} = $val;
         }
         else {
            MKDEBUG && _d('Message not complete');
            $val = '[INCOMPLETE]';
            $session->{state} = 'partial send';
         }
      }
   }

   return $event;
}

sub make_event {
   my ( $session, $packet ) = @_;
   my $event = {
      cmd        => $session->{cmd},
      key        => $session->{key},
      val        => $session->{val} || '',
      res        => $session->{res},
      ts         => $session->{ts},
      host       => $session->{host},
      flags      => $session->{flags}   || 0,
      exptime    => $session->{exptime} || 0,
      bytes      => $session->{bytes}   || 0,
      Query_time => timestamp_diff($session->{ts}, $packet->{ts}),
      pos_in_log => $session->{pos_in_log},
   };
   return $event;
}

sub _get_errors_fh {
   my ( $self ) = @_;
   my $errors_fh = $self->{errors_fh};
   return $errors_fh if $errors_fh;

   my $o = $self->{o};
   if ( $o && $o->has('tcpdump-errors') && $o->got('tcpdump-errors') ) {
      my $errors_file = $o->get('tcpdump-errors');
      MKDEBUG && _d('tcpdump-errors file:', $errors_file);
      open $errors_fh, '>>', $errors_file
         or die "Cannot open tcpdump-errors file $errors_file: $OS_ERROR";
   }

   $self->{errors_fh} = $errors_fh;
   return $errors_fh;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

sub timestamp_diff {
   my ( $start, $end ) = @_;
   my $sd = substr($start, 0, 11, '');
   my $ed = substr($end,   0, 11, '');
   my ( $sh, $sm, $ss ) = split(/:/, $start);
   my ( $eh, $em, $es ) = split(/:/, $end);
   my $esecs = ($eh * 3600 + $em * 60 + $es);
   my $ssecs = ($sh * 3600 + $sm * 60 + $ss);
   if ( $sd eq $ed ) {
      return sprintf '%.6f', $esecs - $ssecs;
   }
   else { # Assume only one day boundary has been crossed, no DST, etc
      return sprintf '%.6f', ( 86_400 - $ssecs ) + $esecs;
   }
}

1;

# ###########################################################################
# End MemcachedProtocolParser package
# ###########################################################################

# ###########################################################################
# MemcachedEvent package 7096
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/MemcachedEvent.pm
#   trunk/common/t/MemcachedEvent.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package MemcachedEvent;


use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

my %cmds = map { $_ => 1 } qw(
   set
   add
   replace
   append
   prepend
   cas
   get
   gets
   delete
   incr
   decr
);

my %cmd_handler_for = (
   set      => \&handle_storage_cmd,
   add      => \&handle_storage_cmd,
   replace  => \&handle_storage_cmd,
   append   => \&handle_storage_cmd,
   prepend  => \&handle_storage_cmd,
   cas      => \&handle_storage_cmd,
   get      => \&handle_retr_cmd,
   gets     => \&handle_retr_cmd,
);

sub new {
   my ( $class, %args ) = @_;
   my $self = {};
   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my $event = $args{event};
   return unless $event;

   if ( !$event->{cmd} || !$event->{key} ) {
      MKDEBUG && _d('Event has no cmd or key:', Dumper($event));
      return;
   }

   if ( !$cmds{$event->{cmd}} ) {
      MKDEBUG && _d("Don't know how to handle cmd:", $event->{cmd});
      return;
   }

   $event->{arg}         = "$event->{cmd} $event->{key}";
   $event->{fingerprint} = $self->fingerprint($event->{arg});
   $event->{key_print}   = $self->fingerprint($event->{key});

   map { $event->{"Memc_$_"} = 'No' } keys %cmds;
   $event->{"Memc_$event->{cmd}"} = 'Yes';  # Got this cmd.
   $event->{Memc_error}           = 'No';  # A handler may change this.
   $event->{Memc_miss}            = 'No';
   if ( $event->{res} ) {
      $event->{Memc_miss}         = 'Yes' if $event->{res} eq 'NOT_FOUND';
   }
   else {
      MKDEBUG && _d('Event has no res:', Dumper($event));
   }

   if ( $cmd_handler_for{$event->{cmd}} ) {
      return $cmd_handler_for{$event->{cmd}}->($event);
   }

   return $event;
}

sub fingerprint {
   my ( $self, $val ) = @_;
   $val =~ s/[0-9A-Fa-f]{16,}|\d+/?/g;
   return $val;
}

sub handle_storage_cmd {
   my ( $event ) = @_;

   if ( !$event->{res} ) {
      MKDEBUG && _d('No result for event:', Dumper($event));
      return;
   }

   $event->{'Memc_Not_Stored'} = $event->{res} eq 'NOT_STORED' ? 'Yes' : 'No';
   $event->{'Memc_Exists'}     = $event->{res} eq 'EXISTS'     ? 'Yes' : 'No';

   return $event;
}

sub handle_retr_cmd {
   my ( $event ) = @_;

   if ( !$event->{res} ) {
      MKDEBUG && _d('No result for event:', Dumper($event));
      return;
   }

   $event->{'Memc_error'} = $event->{res} eq 'INTERRUPTED' ? 'Yes' : 'No';

   return $event;
}


sub handle_delete {
   my ( $event ) = @_;
   return $event;
}

sub handle_incr_decr_cmd {
   my ( $event ) = @_;
   return $event;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End MemcachedEvent package
# ###########################################################################

# ###########################################################################
# BinaryLogParser package 7522
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/BinaryLogParser.pm
#   trunk/common/t/BinaryLogParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package BinaryLogParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

my $binlog_line_1 = qr/at (\d+)$/m;
my $binlog_line_2 = qr/^#(\d{6}\s+\d{1,2}:\d\d:\d\d)\s+server\s+id\s+(\d+)\s+end_log_pos\s+(\d+)\s+(\S+)\s*([^\n]*)$/m;
my $binlog_line_2_rest = qr/thread_id=(\d+)\s+exec_time=(\d+)\s+error_code=(\d+)/m;

sub new {
   my ( $class, %args ) = @_;
   my $self = {
      delim     => undef,
      delim_len => 0,
   };
   return bless $self, $class;
}


sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(next_event tell);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($next_event, $tell) = @args{@required_args};

   local $INPUT_RECORD_SEPARATOR = ";\n#";
   my $pos_in_log = $tell->();
   my $stmt;
   my ($delim, $delim_len) = ($self->{delim}, $self->{delim_len});

   EVENT:
   while ( defined($stmt = $next_event->()) ) {
      my @properties = ('pos_in_log', $pos_in_log);
      my ($ts, $sid, $end, $type, $rest);
      $pos_in_log = $tell->();
      $stmt =~ s/;\n#?\Z//;

      my ( $got_offset, $got_hdr );
      my $pos = 0;
      my $len = length($stmt);
      my $found_arg = 0;
      LINE:
      while ( $stmt =~ m/^(.*)$/mg ) { # /g requires scalar match.
         $pos     = pos($stmt);  # Be careful not to mess this up!
         my $line = $1;          # Necessary for /g and pos() to work.
         $line    =~ s/$delim// if $delim;
         MKDEBUG && _d($line);

         if ( $line =~ m/^\/\*.+\*\/;/ ) {
            MKDEBUG && _d('Comment line');
            next LINE;
         }
 
         if ( $line =~ m/^DELIMITER/m ) {
            my ( $del ) = $line =~ m/^DELIMITER (\S*)$/m;
            if ( $del ) {
               $self->{delim_len} = $delim_len = length $del;
               $self->{delim}     = $delim     = quotemeta $del;
               MKDEBUG && _d('delimiter:', $delim);
            }
            else {
               MKDEBUG && _d('Delimiter reset to ;');
               $self->{delim}     = $delim     = undef;
               $self->{delim_len} = $delim_len = 0;
            }
            next LINE;
         }

         next LINE if $line =~ m/End of log file/;

         if ( !$got_offset && (my ( $offset ) = $line =~ m/$binlog_line_1/m) ) {
            MKDEBUG && _d('Got the at offset line');
            push @properties, 'offset', $offset;
            $got_offset++;
         }

         elsif ( !$got_hdr && $line =~ m/^#(\d{6}\s+\d{1,2}:\d\d:\d\d)/ ) {
            ($ts, $sid, $end, $type, $rest) = $line =~ m/$binlog_line_2/m;
            MKDEBUG && _d('Got the header line; type:', $type, 'rest:', $rest);
            push @properties, 'cmd', 'Query', 'ts', $ts, 'server_id', $sid,
               'end_log_pos', $end;
            $got_hdr++;
         }

         elsif ( $line =~ m/^(?:#|use |SET)/i ) {

            if ( my ( $db ) = $line =~ m/^use ([^;]+)/ ) {
               MKDEBUG && _d("Got a default database:", $db);
               push @properties, 'db', $db;
            }

            elsif ( my ($setting) = $line =~ m/^SET\s+([^;]*)/ ) {
               MKDEBUG && _d("Got some setting:", $setting);
               push @properties, map { s/\s+//; lc } split(/,|\s*=\s*/, $setting);
            }

         }
         else {
            MKDEBUG && _d("Got the query/arg line at pos", $pos);
            $found_arg++;
            if ( $got_offset && $got_hdr ) {
               if ( $type eq 'Xid' ) {
                  my ($xid) = $rest =~ m/(\d+)/;
                  push @properties, 'Xid', $xid;
               }
               elsif ( $type eq 'Query' ) {
                  my ($i, $t, $c) = $rest =~ m/$binlog_line_2_rest/m;
                  push @properties, 'Thread_id', $i, 'Query_time', $t,
                                    'error_code', $c;
               }
               elsif ( $type eq 'Start:' ) {
                  MKDEBUG && _d("Binlog start");
               }
               else {
                  MKDEBUG && _d('Unknown event type:', $type);
                  next EVENT;
               }
            }
            else {
               MKDEBUG && _d("It's not a query/arg, it's just some SQL fluff");
               push @properties, 'cmd', 'Query', 'ts', undef;
            }

            my $delim_len = ($pos == length($stmt) ? $delim_len : 0);
            my $arg = substr($stmt, $pos - length($line) - $delim_len);

            $arg =~ s/$delim// if $delim; # Remove the delimiter.

            if ( $arg =~ m/^DELIMITER/m ) {
               my ( $del ) = $arg =~ m/^DELIMITER (\S*)$/m;
               if ( $del ) {
                  $self->{delim_len} = $delim_len = length $del;
                  $self->{delim}     = $delim     = quotemeta $del;
                  MKDEBUG && _d('delimiter:', $delim);
               }
               else {
                  MKDEBUG && _d('Delimiter reset to ;');
                  $del       = ';';
                  $self->{delim}     = $delim     = undef;
                  $self->{delim_len} = $delim_len = 0;
               }

               $arg =~ s/^DELIMITER.*$//m;  # Remove DELIMITER from arg.
            }

            $arg =~ s/;$//gm;  # Ensure ending ; are gone.
            $arg =~ s/\s+$//;  # Remove trailing spaces and newlines.

            push @properties, 'arg', $arg, 'bytes', length($arg);
            last LINE;
         }
      } # LINE

      if ( $found_arg ) {
         MKDEBUG && _d('Properties of event:', Dumper(\@properties));
         my $event = { @properties };
         if ( $args{stats} ) {
            $args{stats}->{events_read}++;
            $args{stats}->{events_parsed}++;
         }
         return $event;
      }
      else {
         MKDEBUG && _d('Event had no arg');
      }
   } # EVENT

   $args{oktorun}->(0) if $args{oktorun};
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End BinaryLogParser package
# ###########################################################################

# ###########################################################################
# GeneralLogParser package 7522
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/GeneralLogParser.pm
#   trunk/common/t/GeneralLogParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package GeneralLogParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class ) = @_;
   my $self = {
      pending => [],
      db_for  => {},
   };
   return bless $self, $class;
}

my $genlog_line_1= qr{
   \A
   (?:(\d{6}\s+\d{1,2}:\d\d:\d\d))? # Timestamp
   \s+
   (?:\s*(\d+))                     # Thread ID
   \s
   (\w+)                            # Command
   \s+
   (.*)                             # Argument
   \Z
}xs;

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(next_event tell);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($next_event, $tell) = @args{@required_args};

   my $pending = $self->{pending};
   my $db_for  = $self->{db_for};
   my $line;
   my $pos_in_log = $tell->();
   LINE:
   while (
         defined($line = shift @$pending)
      or defined($line = $next_event->())
   ) {
      MKDEBUG && _d($line);
      my ($ts, $thread_id, $cmd, $arg) = $line =~ m/$genlog_line_1/;
      if ( !($thread_id && $cmd) ) {
         MKDEBUG && _d('Not start of general log event');
         next;
      }
      my @properties = ('pos_in_log', $pos_in_log, 'ts', $ts,
         'Thread_id', $thread_id);

      $pos_in_log = $tell->();

      @$pending = ();
      if ( $cmd eq 'Query' ) {
         my $done = 0;
         do {
            $line = $next_event->();
            if ( $line ) {
               my (undef, $next_thread_id, $next_cmd)
                  = $line =~ m/$genlog_line_1/;
               if ( $next_thread_id && $next_cmd ) {
                  MKDEBUG && _d('Event done');
                  $done = 1;
                  push @$pending, $line;
               }
               else {
                  MKDEBUG && _d('More arg:', $line);
                  $arg .= $line;
               }
            }
            else {
               MKDEBUG && _d('No more lines');
               $done = 1;
            }
         } until ( $done );

         chomp $arg;
         push @properties, 'cmd', 'Query', 'arg', $arg;
         push @properties, 'bytes', length($properties[-1]);
         push @properties, 'db', $db_for->{$thread_id} if $db_for->{$thread_id};
      }
      else {
         push @properties, 'cmd', 'Admin';

         if ( $cmd eq 'Connect' ) {
            if ( $arg =~ m/^Access denied/ ) {
               $cmd = $arg;
            }
            else {
               my ($user, undef, $db) = $arg =~ /(\S+)/g;
               my $host;
               ($user, $host) = split(/@/, $user);
               MKDEBUG && _d('Connect', $user, '@', $host, 'on', $db);

               push @properties, 'user', $user if $user;
               push @properties, 'host', $host if $host;
               push @properties, 'db',   $db   if $db;
               $db_for->{$thread_id} = $db;
            }
         }
         elsif ( $cmd eq 'Init' ) {
            $cmd = 'Init DB';
            $arg =~ s/^DB\s+//;
            my ($db) = $arg =~ /(\S+)/;
            MKDEBUG && _d('Init DB:', $db);
            push @properties, 'db',   $db   if $db;
            $db_for->{$thread_id} = $db;
         }

         push @properties, 'arg', "administrator command: $cmd";
         push @properties, 'bytes', length($properties[-1]);
      }

      push @properties, 'Query_time', 0;

      MKDEBUG && _d('Properties of event:', Dumper(\@properties));
      my $event = { @properties };
      if ( $args{stats} ) {
         $args{stats}->{events_read}++;
         $args{stats}->{events_parsed}++;
      }
      return $event;
   } # LINE

   @{$self->{pending}} = ();
   $args{oktorun}->(0) if $args{oktorun};
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End GeneralLogParser package
# ###########################################################################

# ###########################################################################
# ProtocolParser package 7522
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/ProtocolParser.pm
#   trunk/common/t/ProtocolParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package ProtocolParser;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

eval {
   require IO::Uncompress::Inflate;
   IO::Uncompress::Inflate->import(qw(inflate $InflateError));
};

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;

   my $self = {
      server      => $args{server},
      port        => $args{port},
      sessions    => {},
      o           => $args{o},
   };

   return bless $self, $class;
}

sub parse_event {
   my ( $self, %args ) = @_;
   my @required_args = qw(event);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $packet = @args{@required_args};

   if ( $self->{buffer} ) {
      my ($packet_from, $session) = $self->_get_session($packet);
      if ( $packet->{data_len} ) {
         if ( $packet_from eq 'client' ) {
            push @{$session->{client_packets}}, $packet;
            MKDEBUG && _d('Saved client packet');
         }
         else {
            push @{$session->{server_packets}}, $packet;
            MKDEBUG && _d('Saved server packet');
         }
      }

      return unless ($packet_from eq 'client')
                    && ($packet->{fin} || $packet->{rst});

      my $event;
      map {
         $event = $self->_parse_packet($_, $args{misc});
         $args{stats}->{events_parsed}++ if $args{stats};
      } sort { $a->{seq} <=> $b->{seq} }
      @{$session->{client_packets}};
      
      map {
         $event = $self->_parse_packet($_, $args{misc});
         $args{stats}->{events_parsed}++ if $args{stats};
      } sort { $a->{seq} <=> $b->{seq} }
      @{$session->{server_packets}};

      return $event;
   }

   if ( $packet->{data_len} == 0 ) {
      MKDEBUG && _d('No TCP data');
      return;
   }

   my $event = $self->_parse_packet($packet, $args{misc});
   $args{stats}->{events_parsed}++ if $args{stats};
   return $event;
}

sub _parse_packet {
   my ( $self, $packet, $misc ) = @_;

   my ($packet_from, $session) = $self->_get_session($packet);
   MKDEBUG && _d('State:', $session->{state});

   push @{$session->{raw_packets}}, $packet->{raw_packet}
      unless $misc->{recurse};

   if ( $session->{buff} ) {
      $session->{buff_left} -= $packet->{data_len};
      if ( $session->{buff_left} > 0 ) {
         MKDEBUG && _d('Added data to buff; expecting', $session->{buff_left},
            'more bytes');
         return;
      }

      MKDEBUG && _d('Got all data; buff left:', $session->{buff_left});
      $packet->{data}       = $session->{buff} . $packet->{data};
      $packet->{data_len}  += length $session->{buff};
      $session->{buff}      = '';
      $session->{buff_left} = 0;
   }

   $packet->{data} = pack('H*', $packet->{data}) unless $misc->{recurse};
   my $event;
   if ( $packet_from eq 'server' ) {
      $event = $self->_packet_from_server($packet, $session, $misc);
   }
   elsif ( $packet_from eq 'client' ) {
      $event = $self->_packet_from_client($packet, $session, $misc);
   }
   else {
      die 'Packet origin unknown';
   }
   MKDEBUG && _d('State:', $session->{state});

   if ( $session->{out_of_order} ) {
      MKDEBUG && _d('Session packets are out of order');
      push @{$session->{packets}}, $packet;
      $session->{ts_min}
         = $packet->{ts} if $packet->{ts} lt ($session->{ts_min} || '');
      $session->{ts_max}
         = $packet->{ts} if $packet->{ts} gt ($session->{ts_max} || '');
      if ( $session->{have_all_packets} ) {
         MKDEBUG && _d('Have all packets; ordering and processing');
         delete $session->{out_of_order};
         delete $session->{have_all_packets};
         map {
            $event = $self->_parse_packet($_, { recurse => 1 });
         } sort { $a->{seq} <=> $b->{seq} } @{$session->{packets}};
      }
   }

   MKDEBUG && _d('Done with packet; event:', Dumper($event));
   return $event;
}

sub _get_session {
   my ( $self, $packet ) = @_;

   my $src_host = "$packet->{src_host}:$packet->{src_port}";
   my $dst_host = "$packet->{dst_host}:$packet->{dst_port}";

   if ( my $server = $self->{server} ) {  # Watch only the given server.
      $server .= ":$self->{port}";
      if ( $src_host ne $server && $dst_host ne $server ) {
         MKDEBUG && _d('Packet is not to or from', $server);
         return;
      }
   }

   my $packet_from;
   my $client;
   if ( $src_host =~ m/:$self->{port}$/ ) {
      $packet_from = 'server';
      $client      = $dst_host;
   }
   elsif ( $dst_host =~ m/:$self->{port}$/ ) {
      $packet_from = 'client';
      $client      = $src_host;
   }
   else {
      warn 'Packet is not to or from server: ', Dumper($packet);
      return;
   }
   MKDEBUG && _d('Client:', $client);

   if ( !exists $self->{sessions}->{$client} ) {
      MKDEBUG && _d('New session');
      $self->{sessions}->{$client} = {
         client      => $client,
         state       => undef,
         raw_packets => [],
      };
   };
   my $session = $self->{sessions}->{$client};

   return $packet_from, $session;
}

sub _packet_from_server {
   die "Don't call parent class _packet_from_server()";
}

sub _packet_from_client {
   die "Don't call parent class _packet_from_client()";
}

sub make_event {
   my ( $self, $session, $packet ) = @_;
   die "Event has no attributes" unless scalar keys %{$session->{attribs}};
   die "Query has no arg attribute" unless $session->{attribs}->{arg};
   my $start_request = $session->{start_request} || 0;
   my $start_reply   = $session->{start_reply}   || 0;
   my $end_reply     = $session->{end_reply}     || 0;
   MKDEBUG && _d('Request start:', $start_request,
      'reply start:', $start_reply, 'reply end:', $end_reply);
   my $event = {
      Query_time    => $self->timestamp_diff($start_request, $start_reply),
      Transmit_time => $self->timestamp_diff($start_reply, $end_reply),
   };
   @{$event}{keys %{$session->{attribs}}} = values %{$session->{attribs}};
   return $event;
}

sub _get_errors_fh {
   my ( $self ) = @_;
   my $errors_fh = $self->{errors_fh};
   return $errors_fh if $errors_fh;

   my $o = $self->{o};
   if ( $o && $o->has('tcpdump-errors') && $o->got('tcpdump-errors') ) {
      my $errors_file = $o->get('tcpdump-errors');
      MKDEBUG && _d('tcpdump-errors file:', $errors_file);
      open $errors_fh, '>>', $errors_file
         or die "Cannot open tcpdump-errors file $errors_file: $OS_ERROR";
   }

   $self->{errors_fh} = $errors_fh;
   return $errors_fh;
}

sub fail_session {
   my ( $self, $session, $reason ) = @_;
   my $errors_fh = $self->_get_errors_fh();
   if ( $errors_fh ) {
      $session->{reason_for_failure} = $reason;
      my $session_dump = '# ' . Dumper($session);
      chomp $session_dump;
      $session_dump =~ s/\n/\n# /g;
      print $errors_fh "$session_dump\n";
      {
         local $LIST_SEPARATOR = "\n";
         print $errors_fh "@{$session->{raw_packets}}";
         print $errors_fh "\n";
      }
   }
   MKDEBUG && _d('Failed session', $session->{client}, 'because', $reason);
   delete $self->{sessions}->{$session->{client}};
   return;
}

sub timestamp_diff {
   my ( $self, $start, $end ) = @_;
   return 0 unless $start && $end;
   my $sd = substr($start, 0, 11, '');
   my $ed = substr($end,   0, 11, '');
   my ( $sh, $sm, $ss ) = split(/:/, $start);
   my ( $eh, $em, $es ) = split(/:/, $end);
   my $esecs = ($eh * 3600 + $em * 60 + $es);
   my $ssecs = ($sh * 3600 + $sm * 60 + $ss);
   if ( $sd eq $ed ) {
      return sprintf '%.6f', $esecs - $ssecs;
   }
   else { # Assume only one day boundary has been crossed, no DST, etc
      return sprintf '%.6f', ( 86_400 - $ssecs ) + $esecs;
   }
}

sub uncompress_data {
   my ( $self, $data, $len ) = @_;
   die "I need data" unless $data;
   die "I need a len argument" unless $len;
   die "I need a scalar reference to data" unless ref $data eq 'SCALAR';
   MKDEBUG && _d('Uncompressing data');
   our $InflateError;

   my $comp_bin_data = pack('H*', $$data);

   my $uncomp_bin_data = '';
   my $z = new IO::Uncompress::Inflate(
      \$comp_bin_data
   ) or die "IO::Uncompress::Inflate failed: $InflateError";
   my $status = $z->read(\$uncomp_bin_data, $len)
      or die "IO::Uncompress::Inflate failed: $InflateError";

   my $uncomp_data = unpack('H*', $uncomp_bin_data);

   return \$uncomp_data;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End ProtocolParser package
# ###########################################################################

# ###########################################################################
# HTTPProtocolParser package 5811
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/HTTPProtocolParser.pm
#   trunk/common/t/HTTPProtocolParser.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package HTTPProtocolParser;
use base 'ProtocolParser';

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my $self = $class->SUPER::new(
      %args,
      port => 80,
   );
   return $self;
}

sub _packet_from_server {
   my ( $self, $packet, $session, $misc ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;

   MKDEBUG && _d('Packet is from server; client state:', $session->{state}); 

   if ( !$session->{state} ) {
      MKDEBUG && _d('Ignoring mid-stream server response');
      return;
   }

   if ( $session->{out_of_order} ) {
      my ($line1, $content);
      if ( !$session->{have_header} ) {
         ($line1, $content) = $self->_parse_header(
            $session, $packet->{data}, $packet->{data_len});
      }
      if ( $line1 ) {
         $session->{have_header} = 1;
         $packet->{content_len}  = length $content;
         MKDEBUG && _d('Got out of order header with',
            $packet->{content_len}, 'bytes of content');
      }
      my $have_len = $packet->{content_len} || $packet->{data_len};
      map { $have_len += $_->{data_len} }
         @{$session->{packets}};
      $session->{have_all_packets}
         = 1 if $session->{attribs}->{bytes}
                && $have_len >= $session->{attribs}->{bytes};
      MKDEBUG && _d('Have', $have_len, 'of', $session->{attribs}->{bytes});
      return;
   }

   if ( $session->{state} eq 'awaiting reply' ) {

      $session->{start_reply} = $packet->{ts} unless $session->{start_reply};

      my ($line1, $content) = $self->_parse_header($session, $packet->{data},
            $packet->{data_len});

      if ( !$line1 ) {
         $session->{out_of_order}     = 1;  # alert parent
         $session->{have_all_packets} = 0;
         return;
      }

      my ($version, $code, $phrase) = $line1 =~ m/(\S+)/g;
      $session->{attribs}->{Status_code} = $code;
      MKDEBUG && _d('Status code for last', $session->{attribs}->{arg},
         'request:', $session->{attribs}->{Status_code});

      my $content_len = $content ? length $content : 0;
      MKDEBUG && _d('Got', $content_len, 'bytes of content');
      if ( $session->{attribs}->{bytes}
           && $content_len < $session->{attribs}->{bytes} ) {
         $session->{data_len}  = $session->{attribs}->{bytes};
         $session->{buff}      = $content;
         $session->{buff_left} = $session->{attribs}->{bytes} - $content_len;
         MKDEBUG && _d('Contents not complete,', $session->{buff_left},
            'bytes left');
         $session->{state} = 'recving content';
         return;
      }
   }
   elsif ( $session->{state} eq 'recving content' ) {
      if ( $session->{buff} ) {
         MKDEBUG && _d('Receiving content,', $session->{buff_left},
            'bytes left');
         return;
      }
      MKDEBUG && _d('Contents received');
   }
   else {
      warn "Server response in unknown state"; 
      return;
   }

   MKDEBUG && _d('Creating event, deleting session');
   $session->{end_reply} = $session->{ts_max} || $packet->{ts};
   my $event = $self->make_event($session, $packet);
   delete $self->{sessions}->{$session->{client}}; # http is stateless!
   return $event;
}

sub _packet_from_client {
   my ( $self, $packet, $session, $misc ) = @_;
   die "I need a packet"  unless $packet;
   die "I need a session" unless $session;

   MKDEBUG && _d('Packet is from client; state:', $session->{state});

   my $event;
   if ( ($session->{state} || '') =~ m/awaiting / ) {
      MKDEBUG && _d('More client headers:', $packet->{data});
      return;
   }

   if ( !$session->{state} ) {
      $session->{state} = 'awaiting reply';
      my ($line1, undef) = $self->_parse_header($session, $packet->{data}, $packet->{data_len});
      my ($request, $page, $version) = $line1 =~ m/(\S+)/g;
      if ( !$request || !$page ) {
         MKDEBUG && _d("Didn't get a request or page:", $request, $page);
         return;
      }
      $request = lc $request;
      my $vh   = $session->{attribs}->{Virtual_host} || '';
      my $arg = "$request $vh$page";
      MKDEBUG && _d('arg:', $arg);

      if ( $request eq 'get' || $request eq 'post' ) {
         @{$session->{attribs}}{qw(arg)} = ($arg);
      }
      else {
         MKDEBUG && _d("Don't know how to handle a", $request, "request");
         return;
      }

      $session->{start_request}         = $packet->{ts};
      $session->{attribs}->{host}       = $packet->{src_host};
      $session->{attribs}->{pos_in_log} = $packet->{pos_in_log};
      $session->{attribs}->{ts}         = $packet->{ts};
   }
   else {
      die "Probably multiple GETs from client before a server response?"; 
   }

   return $event;
}

sub _parse_header {
   my ( $self, $session, $data, $len, $no_recurse ) = @_;
   die "I need data" unless $data;
   my ($header, $content)    = split(/\r\n\r\n/, $data);
   my ($line1, $header_vals) = $header  =~ m/\A(\S+ \S+ .+?)\r\n(.+)?/s;
   MKDEBUG && _d('HTTP header:', $line1);
   return unless $line1;

   if ( !$header_vals ) {
      MKDEBUG && _d('No header vals');
      return $line1, undef;
   }
   my @headers;
   foreach my $val ( split(/\r\n/, $header_vals) ) {
      last unless $val;
      MKDEBUG && _d('HTTP header:', $val);
      if ( $val =~ m/^Content-Length/i ) {
         ($session->{attribs}->{bytes}) = $val =~ /: (\d+)/;
         MKDEBUG && _d('Saved Content-Length:', $session->{attribs}->{bytes});
      }
      if ( $val =~ m/Content-Encoding/i ) {
         ($session->{compressed}) = $val =~ /: (\w+)/;
         MKDEBUG && _d('Saved Content-Encoding:', $session->{compressed});
      }
      if ( $val =~ m/^Host/i ) {
         ($session->{attribs}->{Virtual_host}) = $val =~ /: (\S+)/;
         MKDEBUG && _d('Saved Host:', ($session->{attribs}->{Virtual_host}));
      }
   }
   return $line1, $content;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End HTTPProtocolParser package
# ###########################################################################

# ###########################################################################
# ExecutionThrottler package 5266
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/ExecutionThrottler.pm
#   trunk/common/t/ExecutionThrottler.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package ExecutionThrottler;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);

use List::Util qw(sum min max);
use Time::HiRes qw(time);
use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my @required_args = qw(rate_max get_rate check_int step);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my $self = {
      step       => 0.05,  # default
      %args, 
      rate_ok    => undef,
      last_check => undef,
      stats      => {
         rate_avg     => 0,
         rate_samples => [],
      },
      int_rates  => [],
      skip_prob  => 0.0,
   };

   return bless $self, $class;
}

sub throttle {
   my ( $self, %args ) = @_;
   my $time = $args{misc}->{time} || time;
   if ( $self->_time_to_check($time) ) {
      my $rate_avg = (sum(@{$self->{int_rates}})   || 0)
                   / (scalar @{$self->{int_rates}} || 1);
      my $running_avg = $self->_save_rate_avg($rate_avg);
      MKDEBUG && _d('Average rate for last interval:', $rate_avg);

      if ( $args{stats} ) {
         $args{stats}->{throttle_checked_rate}++;
         $args{stats}->{throttle_rate_avg} = sprintf '%.2f', $running_avg;
      }

      @{$self->{int_rates}} = ();

      if ( $rate_avg > $self->{rate_max} ) {
         $self->{skip_prob} += $self->{step};
         $self->{skip_prob}  = 1.0 if $self->{skip_prob} > 1.0;
         MKDEBUG && _d('Rate max exceeded');
         $args{stats}->{throttle_rate_max_exceeded}++ if $args{stats};
      }
      else {
         $self->{skip_prob} -= $self->{step};
         $self->{skip_prob} = 0.0 if $self->{skip_prob} < 0.0;
         $args{stats}->{throttle_rate_ok}++ if $args{stats};
      }

      MKDEBUG && _d('Skip probability:', $self->{skip_prob});
      $self->{last_check} = $time;
   }
   else {
      my $current_rate = $self->{get_rate}->();
      push @{$self->{int_rates}}, $current_rate;
      if ( $args{stats} ) {
         $args{stats}->{throttle_rate_min} = min(
            ($args{stats}->{throttle_rate_min} || ()), $current_rate);
         $args{stats}->{throttle_rate_max} = max(
            ($args{stats}->{throttle_rate_max} || ()), $current_rate);
      }
      MKDEBUG && _d('Current rate:', $current_rate);
   } 

   if ( $args{event} ) {
      $args{event}->{Skip_exec} = $self->{skip_prob} <= rand() ? 'No' : 'Yes';
   }

   return $args{event};
}

sub _time_to_check {
   my ( $self, $time ) = @_;
   if ( !$self->{last_check} ) {
      $self->{last_check} = $time;
      return 0;
   }
   return $time - $self->{last_check} >= $self->{check_int} ? 1 : 0;
}

sub rate_avg {
   my ( $self ) = @_;
   return $self->{stats}->{rate_avg} || 0;
}

sub skip_probability {
   my ( $self ) = @_;
   return $self->{skip_prob};
}

sub _save_rate_avg {
   my ( $self, $rate ) = @_;
   my $samples  = $self->{stats}->{rate_samples};
   push @$samples, $rate;
   shift @$samples if @$samples > 1_000;
   $self->{stats}->{rate_avg} = sum(@$samples) / (scalar @$samples);
   return $self->{stats}->{rate_avg} || 0;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End ExecutionThrottler package
# ###########################################################################

# ###########################################################################
# MasterSlave package 7525
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/MasterSlave.pm
#   trunk/common/t/MasterSlave.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package MasterSlave;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use List::Util qw(min max);
use Data::Dumper;
$Data::Dumper::Quotekeys = 0;
$Data::Dumper::Indent    = 0;

sub new {
   my ( $class, %args ) = @_;
   my $self = {
      %args,
      replication_thread => {},
   };
   return bless $self, $class;
}

sub recurse_to_slaves {
   my ( $self, $args, $level ) = @_;
   $level ||= 0;
   my $dp   = $args->{dsn_parser};
   my $dsn  = $args->{dsn};

   my $dbh;
   eval {
      $dbh = $args->{dbh} || $dp->get_dbh(
         $dp->get_cxn_params($dsn), { AutoCommit => 1 });
      MKDEBUG && _d('Connected to', $dp->as_string($dsn));
   };
   if ( $EVAL_ERROR ) {
      print STDERR "Cannot connect to ", $dp->as_string($dsn), "\n"
         or die "Cannot print: $OS_ERROR";
      return;
   }

   my $sql  = 'SELECT @@SERVER_ID';
   MKDEBUG && _d($sql);
   my ($id) = $dbh->selectrow_array($sql);
   MKDEBUG && _d('Working on server ID', $id);
   my $master_thinks_i_am = $dsn->{server_id};
   if ( !defined $id
       || ( defined $master_thinks_i_am && $master_thinks_i_am != $id )
       || $args->{server_ids_seen}->{$id}++
   ) {
      MKDEBUG && _d('Server ID seen, or not what master said');
      if ( $args->{skip_callback} ) {
         $args->{skip_callback}->($dsn, $dbh, $level, $args->{parent});
      }
      return;
   }

   $args->{callback}->($dsn, $dbh, $level, $args->{parent});

   if ( !defined $args->{recurse} || $level < $args->{recurse} ) {

      my @slaves =
         grep { !$_->{master_id} || $_->{master_id} == $id } # Only my slaves.
         $self->find_slave_hosts($dp, $dbh, $dsn, $args->{method});

      foreach my $slave ( @slaves ) {
         MKDEBUG && _d('Recursing from',
            $dp->as_string($dsn), 'to', $dp->as_string($slave));
         $self->recurse_to_slaves(
            { %$args, dsn => $slave, dbh => undef, parent => $dsn }, $level + 1 );
      }
   }
}

sub find_slave_hosts {
   my ( $self, $dsn_parser, $dbh, $dsn, $method ) = @_;

   my @methods = qw(processlist hosts);
   if ( $method ) {
      @methods = grep { $_ ne $method } @methods;
      unshift @methods, $method;
   }
   else {
      if ( ($dsn->{P} || 3306) != 3306 ) {
         MKDEBUG && _d('Port number is non-standard; using only hosts method');
         @methods = qw(hosts);
      }
   }
   MKDEBUG && _d('Looking for slaves on', $dsn_parser->as_string($dsn),
      'using methods', @methods);

   my @slaves;
   METHOD:
   foreach my $method ( @methods ) {
      my $find_slaves = "_find_slaves_by_$method";
      MKDEBUG && _d('Finding slaves with', $find_slaves);
      @slaves = $self->$find_slaves($dsn_parser, $dbh, $dsn);
      last METHOD if @slaves;
   }

   MKDEBUG && _d('Found', scalar(@slaves), 'slaves');
   return @slaves;
}

sub _find_slaves_by_processlist {
   my ( $self, $dsn_parser, $dbh, $dsn ) = @_;

   my @slaves = map  {
      my $slave        = $dsn_parser->parse("h=$_", $dsn);
      $slave->{source} = 'processlist';
      $slave;
   }
   grep { $_ }
   map  {
      my ( $host ) = $_->{host} =~ m/^([^:]+):/;
      if ( $host eq 'localhost' ) {
         $host = '127.0.0.1'; # Replication never uses sockets.
      }
      $host;
   } $self->get_connected_slaves($dbh);

   return @slaves;
}

sub _find_slaves_by_hosts {
   my ( $self, $dsn_parser, $dbh, $dsn ) = @_;

   my @slaves;
   my $sql = 'SHOW SLAVE HOSTS';
   MKDEBUG && _d($dbh, $sql);
   @slaves = @{$dbh->selectall_arrayref($sql, { Slice => {} })};

   if ( @slaves ) {
      MKDEBUG && _d('Found some SHOW SLAVE HOSTS info');
      @slaves = map {
         my %hash;
         @hash{ map { lc $_ } keys %$_ } = values %$_;
         my $spec = "h=$hash{host},P=$hash{port}"
            . ( $hash{user} ? ",u=$hash{user}" : '')
            . ( $hash{password} ? ",p=$hash{password}" : '');
         my $dsn           = $dsn_parser->parse($spec, $dsn);
         $dsn->{server_id} = $hash{server_id};
         $dsn->{master_id} = $hash{master_id};
         $dsn->{source}    = 'hosts';
         $dsn;
      } @slaves;
   }

   return @slaves;
}

sub get_connected_slaves {
   my ( $self, $dbh ) = @_;

   my $show = "SHOW GRANTS FOR ";
   my $user = 'CURRENT_USER()';
   my $vp   = $self->{VersionParser};
   if ( $vp && !$vp->version_ge($dbh, '4.1.2') ) {
      $user = $dbh->selectrow_arrayref('SELECT USER()')->[0];
      $user =~ s/([^@]+)@(.+)/'$1'\@'$2'/;
   }
   my $sql = $show . $user;
   MKDEBUG && _d($dbh, $sql);

   my $proc;
   eval {
      $proc = grep {
         m/ALL PRIVILEGES.*?\*\.\*|PROCESS/
      } @{$dbh->selectcol_arrayref($sql)};
   };
   if ( $EVAL_ERROR ) {

      if ( $EVAL_ERROR =~ m/no such grant defined for user/ ) {
         MKDEBUG && _d('Retrying SHOW GRANTS without host; error:',
            $EVAL_ERROR);
         ($user) = split('@', $user);
         $sql    = $show . $user;
         MKDEBUG && _d($sql);
         eval {
            $proc = grep {
               m/ALL PRIVILEGES.*?\*\.\*|PROCESS/
            } @{$dbh->selectcol_arrayref($sql)};
         };
      }

      die "Failed to $sql: $EVAL_ERROR" if $EVAL_ERROR;
   }
   if ( !$proc ) {
      die "You do not have the PROCESS privilege";
   }

   $sql = 'SHOW PROCESSLIST';
   MKDEBUG && _d($dbh, $sql);
   grep { $_->{command} =~ m/Binlog Dump/i }
   map  { # Lowercase the column names
      my %hash;
      @hash{ map { lc $_ } keys %$_ } = values %$_;
      \%hash;
   }
   @{$dbh->selectall_arrayref($sql, { Slice => {} })};
}

sub is_master_of {
   my ( $self, $master, $slave ) = @_;
   my $master_status = $self->get_master_status($master)
      or die "The server specified as a master is not a master";
   my $slave_status  = $self->get_slave_status($slave)
      or die "The server specified as a slave is not a slave";
   my @connected     = $self->get_connected_slaves($master)
      or die "The server specified as a master has no connected slaves";
   my (undef, $port) = $master->selectrow_array('SHOW VARIABLES LIKE "port"');

   if ( $port != $slave_status->{master_port} ) {
      die "The slave is connected to $slave_status->{master_port} "
         . "but the master's port is $port";
   }

   if ( !grep { $slave_status->{master_user} eq $_->{user} } @connected ) {
      die "I don't see any slave I/O thread connected with user "
         . $slave_status->{master_user};
   }

   if ( ($slave_status->{slave_io_state} || '')
      eq 'Waiting for master to send event' )
   {
      my ( $master_log_name, $master_log_num )
         = $master_status->{file} =~ m/^(.*?)\.0*([1-9][0-9]*)$/;
      my ( $slave_log_name, $slave_log_num )
         = $slave_status->{master_log_file} =~ m/^(.*?)\.0*([1-9][0-9]*)$/;
      if ( $master_log_name ne $slave_log_name
         || abs($master_log_num - $slave_log_num) > 1 )
      {
         die "The slave thinks it is reading from "
            . "$slave_status->{master_log_file},  but the "
            . "master is writing to $master_status->{file}";
      }
   }
   return 1;
}

sub get_master_dsn {
   my ( $self, $dbh, $dsn, $dsn_parser ) = @_;
   my $master = $self->get_slave_status($dbh) or return undef;
   my $spec   = "h=$master->{master_host},P=$master->{master_port}";
   return       $dsn_parser->parse($spec, $dsn);
}

sub get_slave_status {
   my ( $self, $dbh ) = @_;
   if ( !$self->{not_a_slave}->{$dbh} ) {
      my $sth = $self->{sths}->{$dbh}->{SLAVE_STATUS}
            ||= $dbh->prepare('SHOW SLAVE STATUS');
      MKDEBUG && _d($dbh, 'SHOW SLAVE STATUS');
      $sth->execute();
      my ($ss) = @{$sth->fetchall_arrayref({})};

      if ( $ss && %$ss ) {
         $ss = { map { lc($_) => $ss->{$_} } keys %$ss }; # lowercase the keys
         return $ss;
      }

      MKDEBUG && _d('This server returns nothing for SHOW SLAVE STATUS');
      $self->{not_a_slave}->{$dbh}++;
   }
}

sub get_master_status {
   my ( $self, $dbh ) = @_;

   if ( $self->{not_a_master}->{$dbh} ) {
      MKDEBUG && _d('Server on dbh', $dbh, 'is not a master');
      return;
   }

   my $sth = $self->{sths}->{$dbh}->{MASTER_STATUS}
         ||= $dbh->prepare('SHOW MASTER STATUS');
   MKDEBUG && _d($dbh, 'SHOW MASTER STATUS');
   $sth->execute();
   my ($ms) = @{$sth->fetchall_arrayref({})};
   MKDEBUG && _d(Dumper($ms));

   if ( !$ms || scalar keys %$ms < 2 ) {
      MKDEBUG && _d('Server on dbh', $dbh, 'does not seem to be a master');
      $self->{not_a_master}->{$dbh}++;
   }

  return { map { lc($_) => $ms->{$_} } keys %$ms }; # lowercase the keys
}

sub wait_for_master {
   my ( $self, %args ) = @_;
   my @required_args = qw(master_status slave_dbh);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($master_status, $slave_dbh) = @args{@required_args};
   my $timeout       = $args{timeout} || 60;

   my $result;
   my $waited;
   if ( $master_status ) {
      my $sql = "SELECT MASTER_POS_WAIT('$master_status->{file}', "
              . "$master_status->{position}, $timeout)";
      MKDEBUG && _d($slave_dbh, $sql);
      my $start = time;
      ($result) = $slave_dbh->selectrow_array($sql);

      $waited = time - $start;

      MKDEBUG && _d('Result of waiting:', $result);
      MKDEBUG && _d("Waited", $waited, "seconds");
   }
   else {
      MKDEBUG && _d('Not waiting: this server is not a master');
   }

   return {
      result => $result,
      waited => $waited,
   };
}

sub stop_slave {
   my ( $self, $dbh ) = @_;
   my $sth = $self->{sths}->{$dbh}->{STOP_SLAVE}
         ||= $dbh->prepare('STOP SLAVE');
   MKDEBUG && _d($dbh, $sth->{Statement});
   $sth->execute();
}

sub start_slave {
   my ( $self, $dbh, $pos ) = @_;
   if ( $pos ) {
      my $sql = "START SLAVE UNTIL MASTER_LOG_FILE='$pos->{file}', "
              . "MASTER_LOG_POS=$pos->{position}";
      MKDEBUG && _d($dbh, $sql);
      $dbh->do($sql);
   }
   else {
      my $sth = $self->{sths}->{$dbh}->{START_SLAVE}
            ||= $dbh->prepare('START SLAVE');
      MKDEBUG && _d($dbh, $sth->{Statement});
      $sth->execute();
   }
}

sub catchup_to_master {
   my ( $self, $slave, $master, $timeout ) = @_;
   $self->stop_slave($master);
   $self->stop_slave($slave);
   my $slave_status  = $self->get_slave_status($slave);
   my $slave_pos     = $self->repl_posn($slave_status);
   my $master_status = $self->get_master_status($master);
   my $master_pos    = $self->repl_posn($master_status);
   MKDEBUG && _d('Master position:', $self->pos_to_string($master_pos),
      'Slave position:', $self->pos_to_string($slave_pos));

   my $result;
   if ( $self->pos_cmp($slave_pos, $master_pos) < 0 ) {
      MKDEBUG && _d('Waiting for slave to catch up to master');
      $self->start_slave($slave, $master_pos);

      $result = $self->wait_for_master(
            master_status => $master_status,
            slave_dbh     => $slave,
            timeout       => $timeout,
            master_status => $master_status
      );
      if ( !defined $result->{result} ) {
         $slave_status = $self->get_slave_status($slave);
         if ( !$self->slave_is_running($slave_status) ) {
            MKDEBUG && _d('Master position:',
               $self->pos_to_string($master_pos),
               'Slave position:', $self->pos_to_string($slave_pos));
            $slave_pos = $self->repl_posn($slave_status);
            if ( $self->pos_cmp($slave_pos, $master_pos) != 0 ) {
               die "MASTER_POS_WAIT() returned NULL but slave has not "
                  . "caught up to master";
            }
            MKDEBUG && _d('Slave is caught up to master and stopped');
         }
         else {
            die "Slave has not caught up to master and it is still running";
         }
      }
   }
   else {
      MKDEBUG && _d("Slave is already caught up to master");
   }

   return $result;
}

sub catchup_to_same_pos {
   my ( $self, $s1_dbh, $s2_dbh ) = @_;
   $self->stop_slave($s1_dbh);
   $self->stop_slave($s2_dbh);
   my $s1_status = $self->get_slave_status($s1_dbh);
   my $s2_status = $self->get_slave_status($s2_dbh);
   my $s1_pos    = $self->repl_posn($s1_status);
   my $s2_pos    = $self->repl_posn($s2_status);
   if ( $self->pos_cmp($s1_pos, $s2_pos) < 0 ) {
      $self->start_slave($s1_dbh, $s2_pos);
   }
   elsif ( $self->pos_cmp($s2_pos, $s1_pos) < 0 ) {
      $self->start_slave($s2_dbh, $s1_pos);
   }

   $s1_status = $self->get_slave_status($s1_dbh);
   $s2_status = $self->get_slave_status($s2_dbh);
   $s1_pos    = $self->repl_posn($s1_status);
   $s2_pos    = $self->repl_posn($s2_status);

   if ( $self->slave_is_running($s1_status)
     || $self->slave_is_running($s2_status)
     || $self->pos_cmp($s1_pos, $s2_pos) != 0)
   {
      die "The servers aren't both stopped at the same position";
   }

}

sub change_master_to {
   my ( $self, $dbh, $master_dsn, $master_pos ) = @_;
   $self->stop_slave($dbh);
   MKDEBUG && _d(Dumper($master_dsn), Dumper($master_pos));
   my $sql = "CHANGE MASTER TO MASTER_HOST='$master_dsn->{h}', "
      . "MASTER_PORT= $master_dsn->{P}, MASTER_LOG_FILE='$master_pos->{file}', "
      . "MASTER_LOG_POS=$master_pos->{position}";
   MKDEBUG && _d($dbh, $sql);
   $dbh->do($sql);
}

sub make_sibling_of_master {
   my ( $self, $slave_dbh, $slave_dsn, $dsn_parser, $timeout) = @_;

   my $master_dsn  = $self->get_master_dsn($slave_dbh, $slave_dsn, $dsn_parser)
      or die "This server is not a slave";
   my $master_dbh  = $dsn_parser->get_dbh(
      $dsn_parser->get_cxn_params($master_dsn), { AutoCommit => 1 });
   my $gmaster_dsn
      = $self->get_master_dsn($master_dbh, $master_dsn, $dsn_parser)
      or die "This server's master is not a slave";
   my $gmaster_dbh = $dsn_parser->get_dbh(
      $dsn_parser->get_cxn_params($gmaster_dsn), { AutoCommit => 1 });
   if ( $self->short_host($slave_dsn) eq $self->short_host($gmaster_dsn) ) {
      die "The slave's master's master is the slave: master-master replication";
   }

   $self->stop_slave($master_dbh);
   $self->catchup_to_master($slave_dbh, $master_dbh, $timeout);
   $self->stop_slave($slave_dbh);

   my $master_status = $self->get_master_status($master_dbh);
   my $mslave_status = $self->get_slave_status($master_dbh);
   my $slave_status  = $self->get_slave_status($slave_dbh);
   my $master_pos    = $self->repl_posn($master_status);
   my $slave_pos     = $self->repl_posn($slave_status);

   if ( !$self->slave_is_running($mslave_status)
     && !$self->slave_is_running($slave_status)
     && $self->pos_cmp($master_pos, $slave_pos) == 0)
   {
      $self->change_master_to($slave_dbh, $gmaster_dsn,
         $self->repl_posn($mslave_status)); # Note it's not $master_pos!
   }
   else {
      die "The servers aren't both stopped at the same position";
   }

   $mslave_status = $self->get_slave_status($master_dbh);
   $slave_status  = $self->get_slave_status($slave_dbh);
   my $mslave_pos = $self->repl_posn($mslave_status);
   $slave_pos     = $self->repl_posn($slave_status);
   if ( $self->short_host($mslave_status) ne $self->short_host($slave_status)
     || $self->pos_cmp($mslave_pos, $slave_pos) != 0)
   {
      die "The servers don't have the same master/position after the change";
   }
}

sub make_slave_of_sibling {
   my ( $self, $slave_dbh, $slave_dsn, $sib_dbh, $sib_dsn,
        $dsn_parser, $timeout) = @_;

   if ( $self->short_host($slave_dsn) eq $self->short_host($sib_dsn) ) {
      die "You are trying to make the slave a slave of itself";
   }

   my $master_dsn1 = $self->get_master_dsn($slave_dbh, $slave_dsn, $dsn_parser)
      or die "This server is not a slave";
   my $master_dbh1 = $dsn_parser->get_dbh(
      $dsn_parser->get_cxn_params($master_dsn1), { AutoCommit => 1 });
   my $master_dsn2 = $self->get_master_dsn($slave_dbh, $slave_dsn, $dsn_parser)
      or die "The sibling is not a slave";
   if ( $self->short_host($master_dsn1) ne $self->short_host($master_dsn2) ) {
      die "This server isn't a sibling of the slave";
   }
   my $sib_master_stat = $self->get_master_status($sib_dbh)
      or die "Binary logging is not enabled on the sibling";
   die "The log_slave_updates option is not enabled on the sibling"
      unless $self->has_slave_updates($sib_dbh);

   $self->catchup_to_same_pos($slave_dbh, $sib_dbh);

   $sib_master_stat = $self->get_master_status($sib_dbh);
   $self->change_master_to($slave_dbh, $sib_dsn,
         $self->repl_posn($sib_master_stat));

   my $slave_status = $self->get_slave_status($slave_dbh);
   my $slave_pos    = $self->repl_posn($slave_status);
   $sib_master_stat = $self->get_master_status($sib_dbh);
   if ( $self->short_host($slave_status) ne $self->short_host($sib_dsn)
     || $self->pos_cmp($self->repl_posn($sib_master_stat), $slave_pos) != 0)
   {
      die "After changing the slave's master, it isn't a slave of the sibling, "
         . "or it has a different replication position than the sibling";
   }
}

sub make_slave_of_uncle {
   my ( $self, $slave_dbh, $slave_dsn, $unc_dbh, $unc_dsn,
        $dsn_parser, $timeout) = @_;

   if ( $self->short_host($slave_dsn) eq $self->short_host($unc_dsn) ) {
      die "You are trying to make the slave a slave of itself";
   }

   my $master_dsn = $self->get_master_dsn($slave_dbh, $slave_dsn, $dsn_parser)
      or die "This server is not a slave";
   my $master_dbh = $dsn_parser->get_dbh(
      $dsn_parser->get_cxn_params($master_dsn), { AutoCommit => 1 });
   my $gmaster_dsn
      = $self->get_master_dsn($master_dbh, $master_dsn, $dsn_parser)
      or die "The master is not a slave";
   my $unc_master_dsn
      = $self->get_master_dsn($unc_dbh, $unc_dsn, $dsn_parser)
      or die "The uncle is not a slave";
   if ($self->short_host($gmaster_dsn) ne $self->short_host($unc_master_dsn)) {
      die "The uncle isn't really the slave's uncle";
   }

   my $unc_master_stat = $self->get_master_status($unc_dbh)
      or die "Binary logging is not enabled on the uncle";
   die "The log_slave_updates option is not enabled on the uncle"
      unless $self->has_slave_updates($unc_dbh);

   $self->catchup_to_same_pos($master_dbh, $unc_dbh);
   $self->catchup_to_master($slave_dbh, $master_dbh, $timeout);

   my $slave_status  = $self->get_slave_status($slave_dbh);
   my $master_status = $self->get_master_status($master_dbh);
   if ( $self->pos_cmp(
         $self->repl_posn($slave_status),
         $self->repl_posn($master_status)) != 0 )
   {
      die "The slave is not caught up to its master";
   }

   $unc_master_stat = $self->get_master_status($unc_dbh);
   $self->change_master_to($slave_dbh, $unc_dsn,
      $self->repl_posn($unc_master_stat));


   $slave_status    = $self->get_slave_status($slave_dbh);
   my $slave_pos    = $self->repl_posn($slave_status);
   if ( $self->short_host($slave_status) ne $self->short_host($unc_dsn)
     || $self->pos_cmp($self->repl_posn($unc_master_stat), $slave_pos) != 0)
   {
      die "After changing the slave's master, it isn't a slave of the uncle, "
         . "or it has a different replication position than the uncle";
   }
}

sub detach_slave {
   my ( $self, $dbh ) = @_;
   $self->stop_slave($dbh);
   my $stat = $self->get_slave_status($dbh)
      or die "This server is not a slave";
   $dbh->do('CHANGE MASTER TO MASTER_HOST=""');
   $dbh->do('RESET SLAVE'); # Wipes out master.info, etc etc
   return $stat;
}

sub slave_is_running {
   my ( $self, $slave_status ) = @_;
   return ($slave_status->{slave_sql_running} || 'No') eq 'Yes';
}

sub has_slave_updates {
   my ( $self, $dbh ) = @_;
   my $sql = q{SHOW VARIABLES LIKE 'log_slave_updates'};
   MKDEBUG && _d($dbh, $sql);
   my ($name, $value) = $dbh->selectrow_array($sql);
   return $value && $value =~ m/^(1|ON)$/;
}

sub repl_posn {
   my ( $self, $status ) = @_;
   if ( exists $status->{file} && exists $status->{position} ) {
      return {
         file     => $status->{file},
         position => $status->{position},
      };
   }
   else {
      return {
         file     => $status->{relay_master_log_file},
         position => $status->{exec_master_log_pos},
      };
   }
}

sub get_slave_lag {
   my ( $self, $dbh ) = @_;
   my $stat = $self->get_slave_status($dbh);
   return $stat->{seconds_behind_master};
}

sub pos_cmp {
   my ( $self, $a, $b ) = @_;
   return $self->pos_to_string($a) cmp $self->pos_to_string($b);
}

sub short_host {
   my ( $self, $dsn ) = @_;
   my ($host, $port);
   if ( $dsn->{master_host} ) {
      $host = $dsn->{master_host};
      $port = $dsn->{master_port};
   }
   else {
      $host = $dsn->{h};
      $port = $dsn->{P};
   }
   return ($host || '[default]') . ( ($port || 3306) == 3306 ? '' : ":$port" );
}

sub is_replication_thread {
   my ( $self, $query, %args ) = @_; 
   return unless $query;

   my $type = lc $args{type} || 'all';
   die "Invalid type: $type"
      unless $type =~ m/^binlog_dump|slave_io|slave_sql|all$/i;

   my $match = 0;
   if ( $type =~ m/binlog_dump|all/i ) {
      $match = 1
         if ($query->{Command} || $query->{command} || '') eq "Binlog Dump";
   }
   if ( !$match ) {
      if ( ($query->{User} || $query->{user} || '') eq "system user" ) {
         MKDEBUG && _d("Slave replication thread");
         if ( $type ne 'all' ) { 
            my $state = $query->{State} || $query->{state} || '';

            if ( $state =~ m/^init|end$/ ) {
               MKDEBUG && _d("Special state:", $state);
               $match = 1;
            }
            else {
               my ($slave_sql) = $state =~ m/
                  ^(Waiting\sfor\sthe\snext\sevent
                   |Reading\sevent\sfrom\sthe\srelay\slog
                   |Has\sread\sall\srelay\slog;\swaiting
                   |Making\stemp\sfile
                   |Waiting\sfor\sslave\smutex\son\sexit)/xi; 

               $match = $type eq 'slave_sql' &&  $slave_sql ? 1
                      : $type eq 'slave_io'  && !$slave_sql ? 1
                      :                                       0;
            }
         }
         else {
            $match = 1;
         }
      }
      else {
         MKDEBUG && _d('Not system user');
      }

      if ( !defined $args{check_known_ids} || $args{check_known_ids} ) {
         my $id = $query->{Id} || $query->{id};
         if ( $match ) {
            $self->{replication_thread}->{$id} = 1;
         }
         else {
            if ( $self->{replication_thread}->{$id} ) {
               MKDEBUG && _d("Thread ID is a known replication thread ID");
               $match = 1;
            }
         }
      }
   }

   MKDEBUG && _d('Matches', $type, 'replication thread:',
      ($match ? 'yes' : 'no'), '; match:', $match);

   return $match;
}


sub get_replication_filters {
   my ( $self, %args ) = @_;
   my @required_args = qw(dbh);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($dbh) = @args{@required_args};

   my %filters = ();

   my $status = $self->get_master_status($dbh);
   if ( $status ) {
      map { $filters{$_} = $status->{$_} }
      grep { defined $status->{$_} && $status->{$_} ne '' }
      qw(
         binlog_do_db
         binlog_ignore_db
      );
   }

   $status = $self->get_slave_status($dbh);
   if ( $status ) {
      map { $filters{$_} = $status->{$_} }
      grep { defined $status->{$_} && $status->{$_} ne '' }
      qw(
         replicate_do_db
         replicate_ignore_db
         replicate_do_table
         replicate_ignore_table 
         replicate_wild_do_table
         replicate_wild_ignore_table
      );

      my $sql = "SHOW VARIABLES LIKE 'slave_skip_errors'";
      MKDEBUG && _d($dbh, $sql);
      my $row = $dbh->selectrow_arrayref($sql);
      $filters{slave_skip_errors} = $row->[1] if $row->[1] && $row->[1] ne 'OFF';
   }

   return \%filters; 
}


sub pos_to_string {
   my ( $self, $pos ) = @_;
   my $fmt  = '%s/%020d';
   return sprintf($fmt, @{$pos}{qw(file position)});
}

sub reset_known_replication_threads {
   my ( $self ) = @_;
   $self->{replication_thread} = {};
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End MasterSlave package
# ###########################################################################

# ###########################################################################
# Progress package 7096
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Progress.pm
#   trunk/common/t/Progress.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package Progress;

use strict;
use warnings FATAL => 'all';

use English qw(-no_match_vars);
use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg (qw(jobsize)) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   if ( (!$args{report} || !$args{interval}) ) {
      if ( $args{spec} && @{$args{spec}} == 2 ) {
         @args{qw(report interval)} = @{$args{spec}};
      }
      else {
         die "I need either report and interval arguments, or a spec";
      }
   }

   my $name  = $args{name} || "Progress";
   $args{start} ||= time();
   my $self;
   $self = {
      last_reported => $args{start},
      fraction      => 0,       # How complete the job is
      callback      => sub {
         my ($fraction, $elapsed, $remaining, $eta) = @_;
         printf STDERR "$name: %3d%% %s remain\n",
            $fraction * 100,
            Transformers::secs_to_time($remaining),
            Transformers::ts($eta);
      },
      %args,
   };
   return bless $self, $class;
}

sub validate_spec {
   shift @_ if $_[0] eq 'Progress'; # Permit calling as Progress-> or Progress::
   my ( $spec ) = @_;
   if ( @$spec != 2 ) {
      die "spec array requires a two-part argument\n";
   }
   if ( $spec->[0] !~ m/^(?:percentage|time|iterations)$/ ) {
      die "spec array's first element must be one of "
        . "percentage,time,iterations\n";
   }
   if ( $spec->[1] !~ m/^\d+$/ ) {
      die "spec array's second element must be an integer\n";
   }
}

sub set_callback {
   my ( $self, $callback ) = @_;
   $self->{callback} = $callback;
}

sub start {
   my ( $self, $start ) = @_;
   $self->{start} = $self->{last_reported} = $start || time();
}

sub update {
   my ( $self, $callback, $now ) = @_;
   my $jobsize   = $self->{jobsize};
   $now        ||= time();
   $self->{iterations}++; # How many updates have happened;

   if ( $self->{report} eq 'time'
         && $self->{interval} > $now - $self->{last_reported}
   ) {
      return;
   }
   elsif ( $self->{report} eq 'iterations'
         && ($self->{iterations} - 1) % $self->{interval} > 0
   ) {
      return;
   }
   $self->{last_reported} = $now;

   my $completed = $callback->();
   $self->{updates}++; # How many times we have run the update callback

   return if $completed > $jobsize;

   my $fraction = $completed > 0 ? $completed / $jobsize : 0;

   if ( $self->{report} eq 'percentage'
         && $self->fraction_modulo($self->{fraction})
            >= $self->fraction_modulo($fraction)
   ) {
      $self->{fraction} = $fraction;
      return;
   }
   $self->{fraction} = $fraction;

   my $elapsed   = $now - $self->{start};
   my $remaining = 0;
   my $eta       = $now;
   if ( $completed > 0 && $completed <= $jobsize && $elapsed > 0 ) {
      my $rate = $completed / $elapsed;
      if ( $rate > 0 ) {
         $remaining = ($jobsize - $completed) / $rate;
         $eta       = $now + int($remaining);
      }
   }
   $self->{callback}->($fraction, $elapsed, $remaining, $eta, $completed);
}

sub fraction_modulo {
   my ( $self, $num ) = @_;
   $num *= 100; # Convert from fraction to percentage
   return sprintf('%d',
      sprintf('%d', $num / $self->{interval}) * $self->{interval});
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End Progress package
# ###########################################################################

# ###########################################################################
# FileIterator package 7096
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/FileIterator.pm
#   trunk/common/t/FileIterator.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################
package FileIterator;

use strict;
use warnings FATAL => 'all';

use English qw(-no_match_vars);
use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my $self = {
      %args,
   };
   return bless $self, $class;
}

sub get_file_itr {
   my ( $self, @filenames ) = @_;

   my @final_filenames;
   FILENAME:
   foreach my $fn ( @filenames ) {
      if ( !defined $fn ) {
         warn "Skipping undefined filename";
         next FILENAME;
      }
      if ( $fn ne '-' ) {
         if ( !-e $fn || !-r $fn ) {
            warn "$fn does not exist or is not readable";
            next FILENAME;
         }
      }
      push @final_filenames, $fn;
   }

   if ( !@filenames ) {
      push @final_filenames, '-';
      MKDEBUG && _d('Auto-adding "-" to the list of filenames');
   }

   MKDEBUG && _d('Final filenames:', @final_filenames);
   return sub {
      while ( @final_filenames ) {
         my $fn = shift @final_filenames;
         MKDEBUG && _d('Filename:', $fn);
         if ( $fn eq '-' ) { # Magical STDIN filename.
            return (*STDIN, undef, undef);
         }
         open my $fh, '<', $fn or warn "Cannot open $fn: $OS_ERROR";
         if ( $fh ) {
            return ( $fh, $fn, -s $fn );
         }
      }
      return (); # Avoids $f being set to 0 in list context.
   };
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End FileIterator package
# ###########################################################################

# ###########################################################################
# ExplainAnalyzer package 7096
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/ExplainAnalyzer.pm
#   trunk/common/t/ExplainAnalyzer.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package ExplainAnalyzer;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;

sub new {
   my ( $class, %args ) = @_;
   foreach my $arg ( qw(QueryRewriter QueryParser) ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my $self = {
      %args,
   };
   return bless $self, $class;
}

sub explain_query {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(dbh query) ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my ($query, $dbh) = @args{qw(query dbh)};
   $query = $self->{QueryRewriter}->convert_to_select($query);
   if ( $query !~ m/^\s*select/i ) {
      MKDEBUG && _d("Cannot EXPLAIN non-SELECT query:",
         (length $query <= 100 ? $query : substr($query, 0, 100) . "..."));
      return;
   }
   my $sql = "EXPLAIN $query";
   MKDEBUG && _d($dbh, $sql);
   my $explain = $dbh->selectall_arrayref($sql, { Slice => {} });
   MKDEBUG && _d("Result of EXPLAIN:", Dumper($explain));
   return $explain;
}

sub normalize {
   my ( $self, $explain ) = @_;
   my @result; # Don't modify the input.

   foreach my $row ( @$explain ) {
      $row = { %$row }; # Make a copy -- don't modify the input.

      foreach my $col ( qw(key possible_keys key_len ref) ) {
         $row->{$col} = [ split(/,/, $row->{$col} || '') ];
      }

      $row->{Extra} = {
         map {
            my $var = $_;

            if ( my ($key, $vals) = $var =~ m/(Using union)\(([^)]+)\)/ ) {
               $key => [ split(/,/, $vals) ];
            }

            else {
               $var => 1;
            }
         }
         split(/; /, $row->{Extra} || '') # Split on semicolons.
      };

      push @result, $row;
   }

   return \@result;
}

sub get_alternate_indexes {
   my ( $self, $keys, $possible_keys ) = @_;
   my %used = map { $_ => 1 } @$keys;
   return [ grep { !$used{$_} } @$possible_keys ];
}

sub get_index_usage {
   my ( $self, %args ) = @_;
   foreach my $arg ( qw(query explain) ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my ($query, $explain) = @args{qw(query explain)};
   my @result;

   my $lookup = $self->{QueryParser}->get_aliases($query);

   foreach my $row ( @$explain ) {

      next if !defined $row->{table}
         || $row->{table} =~ m/^<(derived|union)\d/;

      my $table = $lookup->{TABLE}->{$row->{table}} || $row->{table};
      my $db    = $lookup->{DATABASE}->{$table}     || $args{db};
      push @result, {
         db  => $db,
         tbl => $table,
         idx => $row->{key},
         alt => $self->get_alternate_indexes(
                  $row->{key}, $row->{possible_keys}),
      };
   }

   MKDEBUG && _d("Index usage for",
      (length $query <= 100 ? $query : substr($query, 0, 100) . "..."),
      ":", Dumper(\@result));
   return \@result;
}

sub get_usage_for {
   my ( $self, $checksum, $db ) = @_;
   die "I need a checksum and db" unless defined $checksum && defined $db;
   my $usage;
   if ( exists $self->{usage}->{$db} # Don't auto-vivify
     && exists $self->{usage}->{$db}->{$checksum} )
   {
      $usage = $self->{usage}->{$db}->{$checksum};
   }
   MKDEBUG && _d("Usage for",
      (length $checksum <= 100 ? $checksum : substr($checksum, 0, 100) . "..."),
      "on", $db, ":", Dumper($usage));
   return $usage;
}

sub save_usage_for {
   my ( $self, $checksum, $db, $usage ) = @_;
   die "I need a checksum and db" unless defined $checksum && defined $db;
   $self->{usage}->{$db}->{$checksum} = $usage;
}

sub fingerprint {
   my ( $self, %args ) = @_;
   my @required_args = qw(explain);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my ($explain) = @args{@required_args};
}

sub sparkline {
   my ( $self, %args ) = @_;
   my @required_args = qw(explain);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my ($explain) = @args{@required_args};
   MKDEBUG && _d("Making sparkline for", Dumper($explain));

   my $access_code = {
      'ALL'             => 'a',
      'const'           => 'c',
      'eq_ref'          => 'e',
      'fulltext'        => 'f',
      'index'           => 'i',
      'index_merge'     => 'm',
      'range'           => 'n',
      'ref_or_null'     => 'o',
      'ref'             => 'r',
      'system'          => 's',
      'unique_subquery' => 'u',
   };

   my $sparkline = '';
   my ($T, $F);  # Using temporary, Using filesort

   foreach my $tbl ( @$explain ) {
      my $code;
      if ( defined $tbl->{type} ) {
         $code = $access_code->{$tbl->{type}} || "?";
         $code = uc $code if $tbl->{Extra}->{'Using index'};
      }
      else {
         $code = '-'
      };
      $sparkline .= $code;

      $T = 1 if $tbl->{Extra}->{'Using temporary'};
      $F = 1 if $tbl->{Extra}->{'Using filesort'};
   }

   if ( $T || $F ) {
      if (    $explain->[-1]->{Extra}->{'Using temporary'}
           || $explain->[-1]->{Extra}->{'Using filesort'} ) {
         $sparkline .= ">" . ($T ? "T" : "") . ($F ? "F" : "");
      }
      else {
         $sparkline = ($T ? "T" : "") . ($F ? "F" : "") . ">$sparkline";
      }
   }

   MKDEBUG && _d("sparkline:", $sparkline);
   return $sparkline;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End ExplainAnalyzer package
# ###########################################################################

# ###########################################################################
# Runtime package 7221
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Runtime.pm
#   trunk/common/t/Runtime.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package Runtime;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

sub new {
   my ( $class, %args ) = @_;
   my @required_args = qw(now);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   if ( ($args{runtime} || 0) < 0 ) {
      die "runtime argument must be greater than zero"
   }

   my $self = {
      %args,
      start_time => undef,
      end_time   => undef,
      time_left  => undef,
      stop       => 0,
   };

   return bless $self, $class;
}

sub time_left {
   my ( $self, %args ) = @_;

   if ( $self->{stop} ) {
      MKDEBUG && _d("No time left because stop was called");
      return 0;
   }

   my $now = $self->{now}->(%args);
   MKDEBUG && _d("Current time:", $now);

   if ( !defined $self->{start_time} ) {
      $self->{start_time} = $now;
   }

   return unless defined $now;

   my $runtime = $self->{runtime};
   return unless defined $runtime;

   if ( !$self->{end_time} ) {
      $self->{end_time} = $now + $runtime;
      MKDEBUG && _d("End time:", $self->{end_time});
   }

   $self->{time_left} = $self->{end_time} - $now;
   MKDEBUG && _d("Time left:", $self->{time_left});
   return $self->{time_left};
}

sub have_time {
   my ( $self, %args ) = @_;
   my $time_left = $self->time_left(%args);
   return 1 if !defined $time_left;  # run forever
   return $time_left <= 0 ? 0 : 1;   # <=0s means runtime has elapsed
}

sub time_elapsed {
   my ( $self, %args ) = @_;

   my $start_time = $self->{start_time};
   return 0 unless $start_time;

   my $now = $self->{now}->(%args);
   MKDEBUG && _d("Current time:", $now);

   my $time_elapsed = $now - $start_time;
   MKDEBUG && _d("Time elapsed:", $time_elapsed);
   if ( $time_elapsed < 0 ) {
      warn "Current time $now is earlier than start time $start_time";
   }
   return $time_elapsed;
}

sub reset {
   my ( $self ) = @_;
   $self->{start_time} = undef;
   $self->{end_time}   = undef;
   $self->{time_left}  = undef;
   $self->{stop}       = 0;
   MKDEBUG && _d("Reset runtime");
   return;
}

sub stop {
   my ( $self ) = @_;
   $self->{stop} = 1;
   return;
}

sub start {
   my ( $self ) = @_;
   $self->{stop} = 0;
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End Runtime package
# ###########################################################################

# ###########################################################################
# Pipeline package 7509
# This package is a copy without comments from the original.  The original
# with comments and its test file can be found in the SVN repository at,
#   trunk/common/Pipeline.pm
#   trunk/common/t/Pipeline.t
# See http://code.google.com/p/maatkit/wiki/Developers for more information.
# ###########################################################################

package Pipeline;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use Data::Dumper;
$Data::Dumper::Indent    = 1;
$Data::Dumper::Sortkeys  = 1;
$Data::Dumper::Quotekeys = 0;
use Time::HiRes qw(time);

sub new {
   my ( $class, %args ) = @_;
   my @required_args = qw();
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }

   my $self = {
      instrument        => 0,
      continue_on_error => 0,

      %args,

      procs           => [],  # coderefs for pipeline processes
      names           => [],  # names for each ^ pipeline proc
      instrumentation => {    # keyed on proc index in procs
         Pipeline => {
            time  => 0,
            calls => 0,
         },
      },
   };
   return bless $self, $class;
}

sub add {
   my ( $self, %args ) = @_;
   my @required_args = qw(process name);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless defined $args{$arg};
   }
   my ($process, $name) = @args{@required_args};

   push @{$self->{procs}}, $process;
   push @{$self->{names}}, $name;
   if ( $self->{instrument} ) {
      $self->{instrumentation}->{$name} = { time => 0, calls => 0 };
   }
   MKDEBUG && _d("Added pipeline process", $name);

   return;
}

sub processes {
   my ( $self ) = @_;
   return @{$self->{names}};
}

sub execute {
   my ( $self, %args ) = @_;

   die "Cannot execute pipeline because no process have been added"
      unless scalar @{$self->{procs}};

   my $oktorun = $args{oktorun};
   die "I need an oktorun argument" unless $oktorun;
   die '$oktorun argument must be a reference' unless ref $oktorun;

   my $pipeline_data = $args{pipeline_data} || {};
   $pipeline_data->{oktorun} = $oktorun;

   my $stats = $args{stats};  # optional

   MKDEBUG && _d("Pipeline starting at", time);
   my $instrument = $self->{instrument};
   my $processes  = $self->{procs};
   EVENT:
   while ( $$oktorun ) {
      my $procno  = 0;  # so we can see which proc if one causes an error
      my $output;
      eval {
         PIPELINE_PROCESS:
         while ( $procno < scalar @{$self->{procs}} ) {
            my $call_start = $instrument ? time : 0;

            MKDEBUG && _d("Pipeline process", $self->{names}->[$procno]);
            $output = $processes->[$procno]->($pipeline_data);

            if ( $instrument ) {
               my $call_end = time;
               my $call_t   = $call_end - $call_start;
               $self->{instrumentation}->{$self->{names}->[$procno]}->{time} += $call_t;
               $self->{instrumentation}->{$self->{names}->[$procno]}->{count}++;
               $self->{instrumentation}->{Pipeline}->{time} += $call_t;
               $self->{instrumentation}->{Pipeline}->{count}++;
            }
            if ( !$output ) {
               MKDEBUG && _d("Pipeline restarting early after",
                  $self->{names}->[$procno]);
               if ( $stats ) {
                  $stats->{"pipeline_restarted_after_"
                     .$self->{names}->[$procno]}++;
               }
               last PIPELINE_PROCESS;
            }
            $procno++;
         }
      };
      if ( $EVAL_ERROR ) {
         warn "Pipeline process $procno ("
            . ($self->{names}->[$procno] || "")
            . ") caused an error: $EVAL_ERROR";
         die $EVAL_ERROR unless $self->{continue_on_error};
      }
   }

   MKDEBUG && _d("Pipeline stopped at", time);
   return;
}

sub instrumentation {
   my ( $self ) = @_;
   return $self->{instrumentation};
}

sub reset {
   my ( $self ) = @_;
   foreach my $proc_name ( @{$self->{names}} ) {
      if ( exists $self->{instrumentation}->{$proc_name} ) {
         $self->{instrumentation}->{$proc_name}->{calls} = 0;
         $self->{instrumentation}->{$proc_name}->{time}  = 0;
      }
   }
   $self->{instrumentation}->{Pipeline}->{calls} = 0;
   $self->{instrumentation}->{Pipeline}->{time}  = 0;
   return;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

1;

# ###########################################################################
# End Pipeline package
# ###########################################################################

# ###########################################################################
# This is a combination of modules and programs in one -- a runnable module.
# http://www.perl.com/pub/a/2006/07/13/lightning-articles.html?page=last
# Or, look it up in the Camel book on pages 642 and 643 in the 3rd edition.
#
# Check at the end of this package for the call to main() which actually runs
# the program.
# ###########################################################################
package mk_query_digest;

use English qw(-no_match_vars);
use Time::Local qw(timelocal);
use Time::HiRes qw(time usleep);
use List::Util qw(max);
use POSIX qw(signal_h);
use Data::Dumper;
$Data::Dumper::Indent = 1;
$OUTPUT_AUTOFLUSH     = 1;

Transformers->import(qw(shorten micro_t percentage_of ts make_checksum
   any_unix_timestamp parse_timestamp unix_timestamp crc32));

use constant MKDEBUG => $ENV{MKDEBUG} || 0;

use sigtrap 'handler', \&sig_int, 'normal-signals';

# Global variables.  Only really essential variables should be here.
my $oktorun = 1;
my $ex_dbh;  # For --execute
my $ep_dbh;  # For --explain
my $ps_dbh;  # For Processlist
my $aux_dbh; # For --aux-dsn (--since/--until "MySQL expression")

sub main {
   @ARGV    = @_;  # set global ARGV for this package
   $oktorun = 1;   # reset between tests else pipeline won't run

   # ##########################################################################
   # Get configuration information.
   # ##########################################################################
   my $o = new OptionParser();
   $o->get_specs();
   $o->get_opts();

   my $dp = $o->DSNParser();
   $dp->prop('set-vars', $o->get('set-vars'));

   # Frequently used options.
   my $review_dsn = $o->get('review'); 
   my @groupby    = @{$o->get('group-by')};
   my @orderby;
   if ( (grep { $_ eq 'genlog' || $_ eq 'GeneralLogParser' } @{$o->get('type')})
        && !$o->got('order-by') ) {
      @orderby = 'Query_time:cnt';
   }
   else { 
      @orderby = @{$o->get('order-by')};
   }

   my $can_gzip;
   if ( $o->get('save-results') ) {
      eval {
         require IO::Compress::Gzip;
         IO::Compress::Gzip->import(qw(gzip $GzipError));
      };
      $can_gzip = $EVAL_ERROR ? 0 : 1;
   }

   if ( !$o->get('help') ) {
      if ( $review_dsn
           && (!defined $review_dsn->{D} || !defined $review_dsn->{t}) ) {
         $o->save_error('The --review DSN requires a D (database) and t'
            . ' (table) part specifying the query review table');
      }
      if ( $o->get('mirror')
           && (!$o->get('execute') || !$o->get('processlist')) ) {
         $o->save_error('--mirror requires --execute and --processlist');
      }
      if ( $o->get('outliers')
         && grep { $_ !~ m/^\w+:[0-9.]+(?::[0-9.]+)?$/ } @{$o->get('outliers')}
      ) {
         $o->save_error('--outliers requires two or three colon-separated fields');
      }
      if ( $o->get('execute-throttle') ) {
         my ($rate_max, $int, $step) = @{$o->get('execute-throttle')};
         $o->save_error("--execute-throttle max time must be between 1 and 100")
            unless $rate_max && $rate_max > 0 && $rate_max <= 100;
         $o->save_error("No check interval value for --execute-throttle")
            unless $int;
         $o->save_error("--execute-throttle check interval must be an integer")
            if $int =~ m/[^\d]/;
         $o->save_error("--execute-throttle step must be between 1 and 100")
            if $step && ($step < 1 || $step > 100);
      }
      if ( $o->get('save-results') && $o->get('gzip') && !$can_gzip ) {
         my $err = "Cannot gzip --save-results because IO::Compress::Gzip "
                 . "is not installed";
         if ( $o->got('gzip') ) {
            $o->save_error($err);
         }
         else {
            warn $err;
         }
      }
      if ( $o->get('progress') ) {
         eval { Progress->validate_spec($o->get('progress')) };
         if ( $EVAL_ERROR ) {
            chomp $EVAL_ERROR;
            $o->save_error("--progress $EVAL_ERROR");
         }
      }

      if ( $o->get('apdex-threshold') <= 0 ) {
         $o->save_error("Apdex threshold must be a positive decimal value");
      }
   }

   # Set an orderby for each groupby; use the default orderby if there
   # are more groupby than orderby attribs.
   my $default_orderby = $o->get_defaults()->{'order-by'};
   foreach my $i ( 0..$#groupby ) {
      $orderby[$i] ||= $default_orderby;
   }
   $o->set('order-by', \@orderby);


   my $run_time_mode = lc $o->get('run-time-mode');
   my $run_time_interval; 
   eval {
      $run_time_interval = verify_run_time(
         run_mode => $run_time_mode,
         run_time => $o->get('run-time'),
      );
   };
   if ( $EVAL_ERROR ) {
      chomp $EVAL_ERROR;
      $o->save_error($EVAL_ERROR);
   }

   $o->usage_or_errors();

   # ########################################################################
   # Common modules.
   # #######################################################################
   my $q  = new Quoter();
   my $qp = new QueryParser();
   my $qr = new QueryRewriter(QueryParser=>$qp);
   my %common_modules = (
      OptionParser  => $o,
      DSNParser     => $dp,
      Quoter        => $q,
      QueryParser   => $qp,
      QueryRewriter => $qr,
   );

   # ########################################################################
   # Set up for --explain
   # ########################################################################
   my $exa;
   if ( my $ep_dsn = $o->get('explain') ) {
      $ep_dbh = get_cxn(
         for          => '--explain',
         dsn          => $ep_dsn,
         OptionParser => $o,
         DSNParser    => $dp,
         opts         => { AutoCommit => 1 },
      );
      $ep_dbh->{InactiveDestroy}  = 1;  # Don't die on fork().

      $exa = new ExplainAnalyzer(
         QueryRewriter => $qr,
         QueryParser   => $qp,
      );
   }

   # ########################################################################
   # Set up for --review and --review-history.
   # ########################################################################
   my $qv;      # QueryReview
   my $qv_dbh;  # For QueryReview
   my $qv_dbh2; # For QueryReview and --review-history
   if ( $review_dsn ) {
      my $tp  = new TableParser(Quoter => $q);
      my $du  = new MySQLDump();
      $qv_dbh = get_cxn(
         for          => '--review',
         dsn          => $review_dsn,
         OptionParser => $o,
         DSNParser    => $dp,
         opts         => { AutoCommit => 1 },
      );
      $qv_dbh->{InactiveDestroy}  = 1;  # Don't die on fork().
      my @db_tbl = @{$review_dsn}{qw(D t)};
      my $db_tbl = $q->quote(@db_tbl);

      # Create the review table if desired
      if ( $o->get('create-review-table') ) {
         my $sql = $o->read_para_after(
            __FILE__, qr/MAGIC_create_review/);
         $sql =~ s/query_review/IF NOT EXISTS $db_tbl/;
         MKDEBUG && _d($sql);
         $qv_dbh->do($sql);
      }

      # Check for existence and the permissions to insert into the
      # table.
      if ( !$tp->check_table(
            dbh       => $qv_dbh,
            db        => $db_tbl[0],
            tbl       => $db_tbl[1],
            all_privs => 1) )
      {
         die "The query review table $db_tbl "
            . "does not exist or you do not have INSERT privileges";
      }

      # Set up the new QueryReview object.
      my $struct = $tp->parse($du->get_create_table($qv_dbh, $q, @db_tbl));
      $qv = new QueryReview(
         dbh         => $qv_dbh,
         db_tbl      => $db_tbl,
         tbl_struct  => $struct,
         quoter      => $q,
      );

      # Set up the review-history table
      if ( my $review_history_dsn = $o->get('review-history') ) {
         $qv_dbh2 = get_cxn(
            for          => '--review-history',
            dsn          => $review_history_dsn,
            OptionParser => $o,
            DSNParser    => $dp,
            opts         => { AutoCommit => 1 },
         );
         $qv_dbh2->{InactiveDestroy}  = 1;  # Don't die on fork().
         my @hdb_tbl = @{$o->get('review-history')}{qw(D t)};
         my $hdb_tbl = $q->quote(@hdb_tbl);

         # Create the review-history table if desired
         if ( $o->get('create-review-history-table') ) {
            my $sql = $o->read_para_after(
               __FILE__, qr/MAGIC_create_review_history/);
            $sql =~ s/query_review_history/IF NOT EXISTS $hdb_tbl/;
            MKDEBUG && _d($sql);
            $qv_dbh2->do($sql);
         }

         # Check for existence and the permissions to insert into the
         # table.
         if ( !$tp->check_table(
               dbh       => $qv_dbh2,
               db        => $hdb_tbl[0],
               tbl       => $hdb_tbl[1],
               all_privs => 1) )
         {
            die "The query review history table $hdb_tbl "
               . "does not exist or you do not have INSERT privileges";
         }

         # Inspect for MAGIC_history_cols.  Add them to the --select list
         # only if an explicit --select list was given.  Otherwise, leave
         # --select undef which will cause EventAggregator to aggregate every
         # attribute available which will include the history columns.
         # If no --select list was given and we make one by adding the history
         # columsn to it, then EventAggregator will only aggregate the
         # history columns and nothing else--we don't want this.
         my $tbl = $tp->parse($du->get_create_table($qv_dbh2, $q, @hdb_tbl));
         my $pat = $o->read_para_after(__FILE__, qr/MAGIC_history_cols/);
         $pat    =~ s/\s+//g;
         $pat    = qr/^(.*?)_($pat)$/;
         # Get original --select values.
         my %select = map { $_ => 1 } @{$o->get('select')};
         foreach my $col ( @{$tbl->{cols}} ) {
            my ( $attr, $metric ) = $col =~ m/$pat/;
            next unless $attr && $metric;
            $attr = ucfirst $attr if $attr =~ m/_/; # TableParser lowercases
            # Add history table values to original select values.
            $select{$attr}++;
         }

         if ( $o->got('select') ) {
            # Re-set --select with its original values plus the history
            # table values.
            $o->set('select', [keys %select]);
            MKDEBUG && _d("--select after parsing --review-history table:", 
               @{$o->get('select')});
         }

         # And tell the QueryReview that it has more work to do.
         $qv->set_history_options(
            table      => $hdb_tbl,
            dbh        => $qv_dbh2,
            tbl_struct => $tbl,
            col_pat    => $pat,
         );
      }
   }
   
   # ########################################################################
   # Create all the pipeline processes that do all the work: get input,
   # parse events, manage runtime, switch iterations, aggregate, etc.
   # ########################################################################

   # These four vars are passed to print_reports().
   my @ea;         # EventAggregator objs
   my @tl;         # EventTimeline obj
   my @read_files; # file names that have been parsed
   my %stats;      # various stats/counters used in some procs

   # The pipeline data hashref is passed to each proc.  Procs use this to
   # pass data through the pipeline.  The most importat data is the event.
   # Other data includes in the next_event callback, time and iters left,
   # etc.  This hashref is accessed inside a proc via the $args arg.
   my $pipeline_data = {
      iter  => 1,
      stats => \%stats,
   };

   # Enable timings to instrument code for either of these two opts.
   # Else, don't instrument to avoid cost of measurement.
   my $instrument = $o->get('pipeline-profile') || $o->get('execute-throttle');
   MKDEBUG && _d('Instrument:', $instrument);

   my $pipeline = new Pipeline(
      instrument        => $instrument,
      continue_on_error => $o->get('continue-on-error'),
   );

   # ########################################################################
   # Procs before the terminator are, in general, responsible for getting
   # and event that procs after the terminator process before aggregation
   # at the end of the pipeline.  Therefore, these pre-terminator procs
   # should not assume an event exists.  If one does, they should let the
   # pipeline continue.  Only the terminator proc terminates the pipeline.
   # ########################################################################

   { # prep
      $pipeline->add(
         name    => 'prep',
         process => sub {
            my ( $args ) = @_;
            # Stuff you'd like to do to make sure pipeline data is prepped
            # and ready to go...

            $args->{event} = undef;  # remove event from previous pass

            return $args;
         },
      );
   } # prep

   { # input
      my $fi        = new FileIterator();
      my $next_file = $fi->get_file_itr(@ARGV);
      my $input_fh; # the current input fh
      my $pr;       # Progress obj for ^

      $pipeline->add(
         name    => 'input',
         process => sub {
            my ( $args ) = @_;
            # Only get the next file when there's no fh or no more events in
            # the current fh.  This allows us to do collect-and-report cycles
            # (i.e. iterations) on huge files.  This doesn't apply to infinite
            # inputs because they don't set more_events false.
            if ( !$args->{input_fh} || !$args->{more_events} ) {
               if ( $args->{input_fh} ) {
                  close $args->{input_fh}
                     or die "Cannot close input fh: $OS_ERROR";
               }
               my ($fh, $filename, $filesize) = $next_file->();
               if ( $fh ) {
                  MKDEBUG && _d('Reading', $filename);
                  push @read_files, $filename || "STDIN";

                  # Create callback to read next event.  Some inputs, like
                  # Processlist, may use something else but most next_event.
                  if ( my $read_time = $o->get('read-timeout') ) {
                     $args->{next_event}
                        = sub { return read_timeout($fh, $read_time); };
                  }
                  else {
                     $args->{next_event} = sub { return <$fh>; };
                  }
                  $args->{input_fh}    = $fh;
                  $args->{tell}        = sub { return tell $fh; };
                  $args->{more_events} = 1;

                  # Reset in case we read two logs out of order by time.
                  $args->{past_since} = 0 if $o->get('since');
                  $args->{at_until}   = 0 if $o->get('until');

                  # Make a progress reporter, one per file.
                  if ( $o->get('progress') && $filename && -e $filename ) {
                     $pr = new Progress(
                        jobsize => $filesize,
                        spec    => $o->get('progress'),
                        name    => $filename,
                     );
                  }
               }
               else {
                  MKDEBUG && _d("No more input");
                  # This will cause terminator proc to terminate the pipeline.
                  $args->{input_fh}    = undef;
                  $args->{more_events} = 0;
               }
            }
            $pr->update($args->{tell}) if $pr;
            return $args;
         },
      );
   } # input

   { # event
      my $misc;
      if ( my $ps_dsn = $o->get('processlist') ) {
         my $ms = new MasterSlave();
         my $pl = new Processlist(
            interval    => $o->get('interval') * 1_000_000,
            MasterSlave => $ms
         );
         my ( $sth, $cxn );
         my $cur_server = 'processlist';
         my $cur_time   = 0;

         if ( $o->get('ask-pass') ) {
            $ps_dsn->{p} = OptionParser::prompt_noecho("Enter password for "
               . "--processlist: ");
            $o->get('processlist', $ps_dsn);
         }

         my $code = sub {
            my $err;
            do {
               eval { $sth->execute; };
               $err = $EVAL_ERROR;
               if ( $err ) { # Try to reconnect when there's an error.
                  eval {
                     ($cur_server, $ps_dbh) = find_role(
                        OptionParser => $o,
                        DSNParser    => $dp,
                        dbh          => $ps_dbh,
                        current      => $cur_server,
                        read_only    => 0,
                        comment      => 'for --processlist'
                     );
                     $cur_time = time();
                     $sth      = $ps_dbh->prepare('SHOW FULL PROCESSLIST');
                     $cxn      = $ps_dbh->{mysql_thread_id};
                     $sth->execute();
                  };
                  $err = $EVAL_ERROR;
                  if ( $err ) {
                     warn $err;
                     sleep 1;
                  }
               }
            } until ( $sth && !$err );
            if ( $o->get('mirror')
                 && time() - $cur_time > $o->get('mirror')) {
               ($cur_server, $ps_dbh) = find_role(
                  OptionParser => $o,
                  DSNParser    => $dp,
                  dbh          => $ps_dbh,
                  current      => $cur_server,
                  read_only    => 0,
                  comment      => 'for --processlist'
               );
               $cur_time = time();
            }

            return [ grep { $_->[0] != $cxn } @{ $sth->fetchall_arrayref(); } ];
         };

         $pipeline->add(
            name    => ref $pl,
            process => sub {
               my ( $args ) = @_;
               my $event = $pl->parse_event(code => $code);
               $args->{event} = $event if $event;
               return $args;
            },
         );
      }  # get events from processlist
      else {
         my %alias_for = (
            slowlog   => ['SlowLogParser'],
            binlog    => ['BinaryLogParser'],
            genlog    => ['GeneralLogParser'],
            tcpdump   => ['TcpdumpParser','MySQLProtocolParser'],
            memcached => ['TcpdumpParser','MemcachedProtocolParser',
                          'MemcachedEvent'],
            http      => ['TcpdumpParser','HTTPProtocolParser'],
            pglog     => ['PgLogParser'],
         );
         my $type = $o->get('type');
         $type    = $alias_for{$type->[0]} if $alias_for{$type->[0]};

         my ($server, $port);
         if ( my $watch_server = $o->get('watch-server') ) {
            # This should match all combinations of HOST and PORT except
            # "host-name.port" because "host.mysql" could be either
            # host "host" and port "mysql" or just host "host.mysql"
            # (e.g. if someone added "127.1 host.mysql" to etc/hosts).
            # So host-name* requires a colon between it and a port.
            ($server, $port) = $watch_server
                  =~ m/^((?:\d+\.\d+\.\d+\.\d+|[\w\.\-]+\w))(?:[\:\.](\S+))?/;
            MKDEBUG && _d('Watch server', $server, 'port', $port);
         }

         foreach my $module ( @$type ) {
            my $parser;
            eval {
               $parser = $module->new(
                  server => $server,
                  port   => $port,
                  o      => $o,
               );
            };
            if ( $EVAL_ERROR ) {
               die "Failed to load $module module: $EVAL_ERROR";
            }
            
            $pipeline->add(
               name    => ref $parser,
               process => sub {
                  my ( $args ) = @_;
                  if ( $args->{input_fh} ) {
                     my $event = $parser->parse_event(
                        event       => $args->{event},
                        next_event  => $args->{next_event},
                        tell        => $args->{tell},
                        misc        => $args->{misc},
                        oktorun     => sub { $args->{more_events} = $_[0]; },
                        stats       => $args->{stats},
                     );
                     if ( $event ) {
                        $args->{event} = $event;
                        return $args;
                     }
                     MKDEBUG && _d("No more events, input EOF");
                     return;  # next input
                  }
                  # No input, let pipeline run so the last report is printed.
                  return $args;
               },
            );
         }
      }  # get events from log file

      if ( my $patterns = $o->get('embedded-attributes') ) {
         $misc->{embed}   = qr/$patterns->[0]/o;
         $misc->{capture} = qr/$patterns->[1]/o;
         MKDEBUG && _d('Patterns for embedded attributes:', $misc->{embed},
               $misc->{capture});
      }
      $pipeline_data->{misc} = $misc;
   } # event

   { # runtime
      my $now_callback;
      if ( $run_time_mode eq 'clock' ) {
         $now_callback = sub { return time; };
      }
      elsif ( $run_time_mode eq 'event' ) {
         $now_callback = sub {
            my ( %args ) = @_;
            my $event = $args{event};
            return unless $event && $event->{ts};
            MKDEBUG && _d("Log time:", $event->{ts});
            return unix_timestamp(parse_timestamp($event->{ts}));
         };
      }
      else {
         $now_callback = sub { return; };
      }
      $pipeline_data->{Runtime} = new Runtime(
         now     => $now_callback,
         runtime => $o->get('run-time'),
      );

      $pipeline->add(
         name    => 'runtime',
         process => sub {
            my ( $args ) = @_;
            if ( $run_time_mode eq 'interval' ) {
               my $event = $args->{event};
               return $args unless $event && $event->{ts};

               my $ts = $args->{unix_ts}
                  = unix_timestamp(parse_timestamp($event->{ts}));

               if ( !$args->{next_ts_interval} ) {
                  # We need to figure out what interval we're in and what
                  # interval is next.  So first we need to parse the ts.
                  if ( my($y, $m, $d, $h, $i, $s)
                        = $args->{event}->{ts} =~ m/^$mysql_ts$/ ) {
                     my $rt = $o->get('run-time');
                     if ( $run_time_interval == 60 ) {
                        MKDEBUG && _d("Run-time interval in seconds");
                        my $this_minute = unix_timestamp(parse_timestamp(
                           "$y$m$d $h:$i:00"));
                        do { $this_minute += $rt } until $this_minute > $ts;
                        $args->{next_ts_interval} = $this_minute;
                     }
                     elsif ( $run_time_interval == 3600 ) {
                        MKDEBUG && _d("Run-time interval in minutes");
                        my $this_hour = unix_timestamp(parse_timestamp(
                           "$y$m$d $h:00:00"));
                        do { $this_hour += $rt } until $this_hour > $ts;
                        $args->{next_ts_interval} = $this_hour;
                     }
                     elsif ( $run_time_interval == 86400 ) {
                        MKDEBUG && _d("Run-time interval in days");
                        my $this_day = unix_timestamp(parse_timestamp(
                           "$y$m$d 00:00:00"));
                        $args->{next_ts_interval} = $this_day + $rt;
                     }
                     else {
                        die "Invalid run-time interval: $run_time_interval";
                     }
                     MKDEBUG && _d("First ts interval:",
                        $args->{next_ts_interval});
                  }
                  else {
                     MKDEBUG && _d("Failed to parse MySQL ts:",
                        $args->{event}->{ts});
                  }
               }
            }
            else {
               # Clock and event run-time modes need to check the time.
               $args->{time_left}
                  = $args->{Runtime}->time_left(event=>$args->{event});
            }

            return $args;
         },
      );
   } # runtime

   # Filter early for --since and --until.
   # If --since or --until is a MySQL expression, then any_unix_timestamp()
   # will need this callback to execute the expression.  We don't know what
   # type of time value the user gave, so we'll create the callback in any case.
   if ( $o->get('since') || $o->get('until') ) {
      if ( my $aux_dsn = $o->get('aux-dsn') ) {
         $aux_dbh = get_cxn(
            for          => '--aux',
            dsn          => $aux_dsn,
            OptionParser => $o,
            DSNParser    => $dp,
            opts         => { AutoCommit => 1 }
         );
         $aux_dbh->{InactiveDestroy}  = 1;  # Don't die on fork().
      }
      $aux_dbh ||= $qv_dbh || $qv_dbh2 || $ex_dbh || $ps_dbh || $ep_dbh;
      MKDEBUG && _d('aux dbh:', $aux_dbh);

      my $time_callback = sub {
         my ( $exp ) = @_;
         return unless $aux_dbh;
         my $sql = "SELECT UNIX_TIMESTAMP($exp)";
         MKDEBUG && _d($sql);
         return $aux_dbh->selectall_arrayref($sql)->[0]->[0];
      };
      if ( $o->get('since') ) {
         my $since = any_unix_timestamp($o->get('since'), $time_callback);
         die "Invalid --since value" unless $since;

         $pipeline->add(
            name    => 'since',
            process => sub {
               my ( $args ) = @_;
               my $event = $args->{event};
               return $args unless $event;
               if ( $args->{past_since} ) {
                  MKDEBUG && _d('Already past --since');
                  return $args;
               }
               if ( $event->{ts} ) {
                  my $ts = any_unix_timestamp($event->{ts}, $time_callback);
                  if ( ($ts || 0) >= $since ) {
                     MKDEBUG && _d('Event is at or past --since');
                     $args->{past_since} = 1;
                     return $args;
                  }
               }
               MKDEBUG && _d('Event is before --since (or ts unknown)');
               return;  # next event
            },
         );
      }
      if ( $o->get('until') ) {
         my $until = any_unix_timestamp($o->get('until'), $time_callback);
         die "Invalid --until value" unless $until;
         $pipeline->add(
            name    => 'until',
            process => sub {
               my ( $args ) = @_;
               my $event = $args->{event};
               return $args unless $event;
               if ( $args->{at_until} ) {
                  MKDEBUG && _d('Already past --until');
                  return;
               }
               if ( $event->{ts} ) {
                  my $ts = any_unix_timestamp($event->{ts}, $time_callback);
                  if ( ($ts || 0) >= $until ) {
                     MKDEBUG && _d('Event at or after --until');
                     $args->{at_until} = 1;
                     return;
                  }
               }
               MKDEBUG && _d('Event is before --until (or ts unknown)');
               return $args;
            },
         );
      }
   } # since/until

   { # iteration
      $pipeline->add(
         name    => 'iteration',
         process => sub {
            my ( $args ) = @_;

            # Start the (next) iteration.
            if ( !$args->{iter_start} ) {
               my $iter_start = $args->{iter_start} = time;
               MKDEBUG && _d('Iteration', $args->{iter},
                  'started at', ts($iter_start));
               
               if ( $o->get('print-iterations') ) {
                  print "\n# Iteration $args->{iter} started at ",
                     ts($iter_start), "\n";
               }
            }

            # Determine if we should stop the current iteration.
            # If we do, then we report events collected during this
            # iter, then reset and increment for the next iter.
            my $report    = 0;
            my $time_left = $args->{time_left};
            if ( !$args->{more_events}
                 || defined $time_left && $time_left <= 0 ) {
               MKDEBUG && _d("Runtime elapsed or no more events, reporting");
               $report = 1;
            }
            elsif ( $run_time_mode eq 'interval'
                    && $args->{next_ts_interval}
                    && $args->{unix_ts} >= $args->{next_ts_interval} ) {
               MKDEBUG && _d("Event is in the next interval, reporting");

               # Get the next ts interval based on the current log ts.
               # Log ts can make big jumps, so just += $rt might not
               # set the next ts interval at a time past the current
               # log ts.
               my $rt = $o->get('run-time');
               do {
                  $args->{next_ts_interval} += $rt;
               } until $args->{next_ts_interval} >= $args->{unix_ts};

               $report = 1;
            }

            if ( $report ) {
               MKDEBUG && _d("Iteration", $args->{iter}, "stopped at",ts(time));

               # Get this before calling print_reports() because that sub
               # resets each ea and we may need this later for stats.
               my $n_events_aggregated = $ea[0]->events_processed();

               if ( $n_events_aggregated ) {
                  print_reports(
                     eas             => \@ea,
                     tls             => \@tl,
                     groupby         => \@groupby,
                     orderby         => \@orderby,
                     files           => \@read_files,
                     Pipeline        => $pipeline,
                     QueryReview     => $qv,
                     ExplainAnalyzer => $exa,
                     %common_modules,
                  );
               }
               else {
                  print "\n# No events processed.\n";
               }

               if ( $o->get('statistics') ) {
                  if ( keys %stats ) {
                     my $report = new ReportFormatter(
                        line_width => 74,
                     );
                     $report->set_columns(
                        { name => 'Statistic',                  },
                        { name => 'Count',    right_justify => 1 },
                        { name => '%/Events', right_justify => 1 },
                     );

                     # Have to add this one manually because currently
                     # EventAggregator::aggregate() doesn't know about stats.
                     # It's the same thing as events_processed() though.
                     $stats{events_aggregated} = $n_events_aggregated;

                     # Save value else events_read will be reset during the
                     # foreach loop below and mess up percentage_of().
                     my $n_events_read = $stats{events_read} || 0;

                     my %stats_sort_order = (
                        events_read       => 1,
                        events_parsed     => 2,
                        events_aggregated => 3,
                     );
                     my @stats = sort {
                           QueryReportFormatter::pref_sort(
                              $a, $stats_sort_order{$a},
                              $b, $stats_sort_order{$b})
                     } keys %stats;
                     foreach my $stat ( @stats ) {
                        $report->add_line(
                           $stat,
                           $stats{$stat} || 0,
                           percentage_of(
                              $stats{$stat} || 0,
                              $n_events_read,
                              p => 2),
                        );
                        $stats{$stat} = 0;  # Reset for next iteration.
                     }
                     print "\n" . $report->get_report();
                  }
                  else {
                     print "\n# No statistics values.\n";
                  }
               }

               # Decrement iters_left after finishing an iter because in the
               # default case, 1 iter, if we decr when the iter starts, then
               # terminator will think there's no iters left before the one
               # iter has finished.
               if ( my $max_iters = $o->get('iterations') ) {
                  $args->{iters_left} = $max_iters - $args->{iter};
                  MKDEBUG && _d($args->{iters_left}, "iterations left");
               }

               # Next iteration.
               $args->{iter}++;
               $args->{iter_start} = undef;

               # Runtime is per-iteration, so reset it, and reset time_left
               # else terminator will think runtime has elapsed when really
               # we may just be between iters.
               $args->{Runtime}->reset();
               $args->{time_left} = undef;
            }

            # Continue the pipeline even if we reported and went to the next
            # iter because there could be an event in the pipeline that is
            # the first in the next/new iter.
            return $args;
         },
      );
   } # iteration

   { # terminator
      $pipeline->add(
         name    => 'terminator',
         process => sub {
            my ( $args ) = @_;

            # The first sure-fire state that terminates the pipeline is
            # having no more input.
            if ( !$args->{input_fh} ) {
               MKDEBUG && _d("No more input, terminating pipeline");

               # This shouldn't happen, but I want to know if it does.
               warn "There's an event in the pipeline but no current input: "
                     . Dumper($args)
                  if $args->{event};

               $oktorun = 0;  # 2. terminate pipeline
               return;        # 1. exit pipeline early
            }

            # The second sure-first state is having no more iterations.
            my $iters_left = $args->{iters_left};
            if ( defined $iters_left && $iters_left <= 0 ) {
               MKDEBUG && _d("No more iterations, terminating pipeline");
               $oktorun = 0;  # 2. terminate pipeline
               return;        # 1. exit pipeline early
            }

            # There's time or iters left so keep running.
            if ( $args->{event} ) {
               MKDEBUG && _d("Event in pipeline, continuing");
               return $args;
            }
            else {
               MKDEBUG && _d("No event in pipeline, get next event");
               return;
            }
         },
      );
   } # terminator

   # ########################################################################
   # All pipeline processes after the terminator expect an event
   # (i.e. that $args->{event} exists and is a valid event).
   # ########################################################################

   if ( grep { $_ eq 'fingerprint' } @groupby ) {
      $pipeline->add(
         name    => 'fingerprint',
         process => sub {
            my ( $args ) = @_;
            my $event = $args->{event};
            # Skip events which do not have the groupby attribute.
            my $groupby_val = $event->{arg};
            return unless $groupby_val;
            $event->{fingerprint} = $qr->fingerprint($groupby_val);
            return $args;
         },
      );
   }

   # Make subs which map attrib aliases to their primary attrib.
   foreach my $alt_attrib ( @{$o->get('attribute-aliases')} ) {
      $pipeline->add(
         name    => 'attribute aliases',
         process => make_alt_attrib($alt_attrib),
      );
   }

   # Carry attribs forward for --inherit-attributes.
   my $inherited_attribs = $o->get('inherit-attributes');
   if ( @$inherited_attribs ) {
      my $last_val = {};
      $pipeline->add(
         name    => 'inherit attributes',
         process => sub {
            my ( $args ) = @_;
            my $event = $args->{event};
            foreach my $attrib ( @$inherited_attribs ) {
               if ( defined $event->{$attrib} ) {
                  # Event has val for this attrib; save it as the last val.
                  $last_val->{$attrib} = $event->{$attrib};
               }
               else {
                  # Inherit last val for this attrib (if there was a last val).
                  $event->{$attrib} = $last_val->{$attrib}
                     if defined $last_val->{$attrib};
               }
            }
            return $args;
         },
      );
   }

   { # variations
      my @variations = @{$o->get('variations')};
      if ( @variations ) {
         $pipeline->add(
            name    => 'variations',
            process => sub {
               my ( $args ) = @_;
               my $event = $args->{event};
               foreach my $attrib ( @variations ) {
                  my $checksum = crc32($event->{$attrib});
                  $event->{"${attrib}_crc"} = $checksum if defined $checksum;
               }
               return $args;
            },
         );
      }
   } # variations

   if ( grep { $_ eq 'tables' } @groupby ) {
      $pipeline->add(
         name    => 'tables',
         process => sub {
            my ( $args ) = @_;
            my $event = $args->{event};
            my $group_by_val = $event->{arg};
            return unless defined $group_by_val;
            $event->{tables} = [
               map {
                  # Canonicalize and add the db name in front
                  $_ =~ s/`//g;
                  if ( $_ !~ m/\./
                       && (my $db = $event->{db} || $event->{Schema}) ) {
                     $_ = "$db.$_";
                  }
                  $_;
               }
               $qp->get_tables($group_by_val)
            ];
            return $args;
         },
      );
   }

   { # distill
      my %distill_args;
      if ( $o->get('type') eq 'memcached' || $o->get('type') eq 'http' ) {
         $distill_args{generic} = 1;
         if ( $o->get('type') eq 'http' ) {
            # Remove stuff after url.
            $distill_args{trf} = sub {
               my ( $query ) = @_;
               $query =~ s/(\S+ \S+?)(?:[?;].+)/$1/;
               return $query;
            };
         }
      }
      if ( grep { $_ eq 'distill' } @groupby ) {
         $pipeline->add(
            name    => 'distill',
            process => sub {
               my ( $args ) = @_;
               my $event = $args->{event};
               my $group_by_val = $event->{arg};
               return unless defined $group_by_val;
               $event->{distill} = $qr->distill($group_by_val, %distill_args);
               MKDEBUG && !$event->{distill} && _d('Cannot distill',
                  $event->{arg});
               return $args;
            },
         );
      }
   } # distill

   if ( $o->get('zero-admin') ) {
      $pipeline->add(
         name    => 'zero admin',
         process => sub {
            my ( $args ) = @_;
            my $event = $args->{event};
            if ( $event->{arg} && $event->{arg} =~ m/^administrator/ ) {
               $event->{Rows_sent}     = 0 if exists $event->{Rows_sent};
               $event->{Rows_examined} = 0 if exists $event->{Rows_examined};
               $event->{Rows_read}     = 0 if exists $event->{Rows_read};
            }
            return $args;
         },
      );
   } # zero admin
   
   # Filter after special attributes, like fingerprint, tables,
   # distill, etc., have been created.
   if ( $o->get('filter') ) {
      my $filter = $o->get('filter');
      if ( -f $filter && -r $filter ) {
         MKDEBUG && _d('Reading file', $filter, 'for --filter code');
         open my $fh, "<", $filter or die "Cannot open $filter: $OS_ERROR";
         $filter = do { local $/ = undef; <$fh> };
         close $fh;
      }
      else {
         $filter = "( $filter )";  # issue 565
      }
      my $code = 'sub { my ( $args ) = @_; my $event = $args->{event}; '
               . "$filter && return \$args; };";
      MKDEBUG && _d('--filter code:', $code);
      my $sub = eval $code
         or die "Error compiling --filter code: $code\n$EVAL_ERROR";

      $pipeline->add(
         name    => 'filter',
         process => $sub,
      );
   } # filter

   if ( $o->got('sample') ) {
      my $group_by_val = $groupby[0];
      my $num_samples  = $o->get('sample');
      if ( $group_by_val ) {
         my %seen;
         $pipeline->add(
            name    => 'sample',
            process => sub {
               my ( $args ) = @_;
               my $event = $args->{event};
               if ( ++$seen{$event->{$group_by_val}} <= $num_samples ) {
                  MKDEBUG && _d("--sample permits event",
                     $event->{$group_by_val});
                  return $args;
               }
               MKDEBUG && _d("--sample rejects event", $event->{$group_by_val});
               return;
            },
         );
      }
   } # sample

   { # execute throttle and execute
      my $et;
      if ( my $et_args = $o->get('execute-throttle') ) {
         # These were check earlier; no need to check them again.
         my ($rate_max, $int, $step) = @{$o->get('execute-throttle')};
         $step ||= 5;
         $step  /= 100; # step specified as percent but $et expect 0.1=10%, etc.
         MKDEBUG && _d('Execute throttle:', $rate_max, $int, $step);

         my $get_rate = sub {
            my $instrument = $pipeline->instrumentation;
            return percentage_of(
               $instrument->{execute}->{time}   || 0,
               $instrument->{Pipeline}->{time}  || 0,
            );
         };

         $et = new ExecutionThrottler(
            rate_max  => $rate_max,
            get_rate  => $get_rate,
            check_int => $int,
            step      => $step,
         );
         
         $pipeline->add(
            name    => 'execute throttle',
            process => sub {
               my ( $args ) = @_;
               $args->{event} = $et->throttle(
                  event => $args->{event},
                  stats => \%stats,
                  misc  => $args->{misc},
               );
               return $args;
            },
         );
      } # execute throttle

      if ( my $ex_dsn = $o->get('execute') ) {
         if ( $o->get('ask-pass') ) {
            $ex_dsn->{p} = OptionParser::prompt_noecho("Enter password for "
               . "--execute: ");
            $o->set('execute', $ex_dsn);
         }

         my $cur_server = 'execute';
         ($cur_server, $ex_dbh) = find_role(
            OptionParser => $o,
            DSNParser    => $dp,
            dbh          => $ex_dbh,
            current      => $cur_server,
            read_only    => 1,
            comment      => 'for --execute'
         );
         my $cur_time = time();
         my $curdb;
         my $default_db = $o->get('execute')->{D};
         MKDEBUG && _d('Default db:', $default_db);
         
         $pipeline->add(
            name    => 'execute',
            process => sub {
               my ( $args ) = @_;
               my $event = $args->{event};
               $event->{Exec_orig_time} = $event->{Query_time};
               if ( ($event->{Skip_exec} || '') eq 'Yes' ) {
                  MKDEBUG && _d('Not executing event because of ',
                     '--execute-throttle');
                  # Zero Query_time to 'Exec time' will show the real time
                  # spent executing queries.
                  $event->{Query_time} = 0;
                  $stats{execute_skipped}++;
                  return $args;
               }
               $stats{execute_executed}++;
               my $db = $event->{db} || $default_db;
               eval {
                  if ( $db && (!$curdb || $db ne $curdb) ) {
                     $ex_dbh->do("USE $db");
                     $curdb = $db;
                  } 
                  my $start = time();
                  $ex_dbh->do($event->{arg});
                  my $end = time();
                  $event->{Query_time} = $end - $start;
                  $event->{Exec_diff_time}
                     = $event->{Query_time} - $event->{Exec_orig_time};
                  if ($o->get('mirror') && $end-$cur_time > $o->get('mirror')) {
                     ($cur_server, $ex_dbh) = find_role(
                        OptionParser => $o,
                        DSNParser    => $dp,
                        dbh          => $ex_dbh,
                        current      => $cur_server,
                        read_only    => 1,
                        comment      => 'for --execute'
                     );
                     $cur_time = $end;
                  }
               };
               if ( $EVAL_ERROR ) {
                  MKDEBUG && _d($EVAL_ERROR);
                  $stats{execute_error}++;
                  # Don't try to re-execute the statement.  Just skip it.
                  if ( $EVAL_ERROR =~ m/server has gone away/ ) {
                     print STDERR $EVAL_ERROR;
                     eval {
                        ($cur_server, $ex_dbh) = find_role(
                           OptionParser => $o,
                           DSNParser    => $dp,
                           dbh          => $ex_dbh,
                           current      => $cur_server,
                           read_only    => 1,
                           comment      => 'for --execute'
                        );
                        $cur_time = time();
                     };
                     if ( $EVAL_ERROR ) {
                        print STDERR $EVAL_ERROR;
                        sleep 1;
                     }
                     return;
                  }
                  if ( $EVAL_ERROR =~ m/No database/ ) {
                     $stats{execute_no_database}++;
                  }
               }
               return $args;
            },
         );
      } # execute
   } # execute throttle and execute

   if ( $o->get('print') ) {
      my $w = new SlowLogWriter();
      $pipeline->add(
         name    => 'print',
         process => sub {
            my ( $args ) = @_;
            my $event = $args->{event};
            MKDEBUG && _d('callback: print');
            $w->write(*STDOUT, $event);
            return $args;
         },
      );
   } # print

   # Finally, add aggregator obj for each groupby attrib to the callbacks.
   # These aggregating objs should be the last pipeline processes.
   foreach my $i ( 0..$#groupby  ) {
      my $groupby = $groupby[$i];

      # This shouldn't happen.
      die "No --order-by value for --group-by $groupby" unless $orderby[$i];

      my ( $orderby_attrib, $orderby_func ) = split(/:/, $orderby[$i]);

      my %attributes = map {
         my ($name, @alt) = split(/:/, $_);
         $name => [$name, @alt];
      }
      grep { $_ !~ m/^$groupby\b/ }
      @{$o->get('select')};

      # Create an EventAggregator for this groupby attrib and
      # add it to callbacks.
      my $type_for = {
         val          => 'string',
         key_print    => 'string',
         Status_code  => 'string',
         Statement_id => 'string',
         Error_no     => 'string',
         Last_errno   => 'string',
         Thread_id    => 'string',
         Killed       => 'bool',
      };

      my $ea = new EventAggregator(
         groupby           => $groupby,
         attributes        => { %attributes },
         worst             => $orderby_attrib,
         attrib_limit      => $o->get('attribute-value-limit'),
         ignore_attributes => $o->get('ignore-attributes'),
         unroll_limit      => $o->get('check-attributes-limit'),
         type_for          => $type_for,
      );
      push @ea, $ea;

      $pipeline->add(
         name    => "aggregate $groupby",
         process => sub {
            my ( $args ) = @_;
            $ea->aggregate($args->{event});
            return $args;
         },
      );

      # If user wants a timeline report, too, then create an EventTimeline
      # aggregator for this groupby attrib and add it to the callbacks, too.
      if ( $o->get('timeline') ) {
         my $tl = new EventTimeline(
            groupby    => [$groupby],
            attributes => [qw(Query_time ts)],
         );
         push @tl, $tl;

         $pipeline->add(
            name    => "timeline $groupby",
            process => sub {
               my ( $args ) = @_;
               $tl->aggregate($args->{event});
               return $args;
            },
         );
      }
   } # aggregate

   # ########################################################################
   # Daemonize now that everything is setup and ready to work.
   # ########################################################################
   my $daemon;
   if ( $o->get('daemonize') ) {
      $daemon = new Daemon(o=>$o);
      $daemon->daemonize();
      MKDEBUG && _d('I am a daemon now');
   }
   elsif ( $o->get('pid') ) {
      # We're not daemoninzing, it just handles PID stuff.
      $daemon = new Daemon(o=>$o);
      $daemon->make_PID_file();
   }

   # ##########################################################################
   # Parse the input.
   # ##########################################################################

   # Pump the pipeline until either no more input, or we're interrupted by
   # CTRL-C, or--this shouldn't happen--the pipeline causes an error.  All
   # work happens inside the pipeline via the procs we created above.
   eval {
      $pipeline->execute(
         oktorun       => \$oktorun,
         pipeline_data => $pipeline_data,
         stats         => \%stats,
      );
   };
   if ( $EVAL_ERROR ) {
      warn "The pipeline caused an error: $EVAL_ERROR";
   }
   MKDEBUG && _d("Pipeline data:", Dumper($pipeline_data));

   # Disconnect all open $dbh's
   map {
      $dp->disconnect($_);
      MKDEBUG && _d('Disconnected dbh', $_);
   }
   grep { $_ }
   ($qv_dbh, $qv_dbh2, $ex_dbh, $ps_dbh, $ep_dbh, $aux_dbh);

   return 0;
} # End main()

# ############################################################################
# Subroutines.
# ############################################################################

# TODO: This sub is poorly named since it does more than print reports:
# it aggregates, reports, does QueryReview stuff, etc.
sub print_reports {
   my ( %args ) = @_;
   my @required_args = qw(eas OptionParser);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }

   my ($o, $qv, $pipeline) = @args{qw(OptionParser QueryReview Pipeline)};
   my ($eas, $tls, $stats) = @args{qw(eas tls stats)};

   my @reports = @{$o->get('report-format')};
   my @groupby = @{$args{groupby}};
   my @orderby = @{$args{orderby}};

   for my $i ( 0..$#groupby ) {
      if ( $o->get('report') || $qv ) {
         $eas->[$i]->calculate_statistical_metrics(
            apdex_t => $o->get('apdex-threshold'),
         );
      }

      my ($orderby_attrib, $orderby_func) = split(/:/, $orderby[$i]);
      $orderby_attrib = check_orderby_attrib($orderby_attrib, $eas->[$i], $o);
      MKDEBUG && _d('Doing reports for groupby', $groupby[$i], 'orderby',
         $orderby_attrib, $orderby_func);

      my ($worst, $other) = get_worst_queries(
         OptionParser   => $o,
         ea             => $eas->[$i],
         orderby_attrib => $orderby_attrib,
         orderby_func   => $orderby_func,
         limit          => $o->get('limit')->[$i] || '95%:20',
         outliers       => $o->get('outliers')->[$i],
      );

      if ( $o->get('report') ) {
         my $expected_range = $o->get('expected-range');
         my $explain_why    = $expected_range
                            && (   @$worst < $expected_range->[0]
                                || @$worst > $expected_range->[1]);

         # Print a header for this groupby/class if we're doing the
         # standard query report and there's more than one class or
         # there's one class but it's not the normal class grouped
         # by fingerprint.
         my $print_header = 0;
         if ( (grep { $_ eq 'query_report'; } @{$o->get('report-format')})
              && (@groupby > 1 || $groupby[$i] ne 'fingerprint') ) {
            $print_header = 1;
         }

         my $qrf = new QueryReportFormatter(
            dbh             => $ep_dbh,
            %args,
         );
         # http://code.google.com/p/maatkit/issues/detail?id=1141
         $qrf->set_report_formatter(
            report    => 'profile',
            formatter => new ReportFormatter (
               line_width       => $o->get('explain') ? 82 : 74,
               long_last_column => 1,
               extend_right     => 1,
            ),
         );
         $qrf->print_reports(
            reports      => \@reports,
            ea           => $eas->[$i],
            worst        => $worst,
            other        => $other,
            orderby      => $orderby_attrib,
            groupby      => $groupby[$i],
            print_header => $print_header,
            explain_why  => $explain_why,
            files        => $args{files},
            log_type     => $o->get('type')->[0],
            variations   => $o->get('variations'),
            group        => { map { $_=>1 } qw(rusage date hostname files header) }
         );
      }

      if ( $qv ) {  # query review
         update_query_review_tables(
            ea           => $eas->[$i],
            worst        => $worst,
            QueryReview  => $qv,
            OptionParser => $o,
         );
      }

      if ( $o->get('timeline') ) {  # --timeline
         $tls->[$i]->report($tls->[$i]->results(), sub { print @_ });
         $tls->[$i]->reset_aggregated_data();
      }

      if ( $o->get('table-access') ) {  # --table-access
         print_table_access_report(
            ea    => $eas->[$i],
            worst => $worst,
            %args,
         );
      }

      if ( my $file = $o->get('save-results') ) {
         save_results(
            ea    => $eas->[$i],
            worst => $worst,
            file  => $file,
            gzip  => $o->get('gzip'),
         );
      }

      $eas->[$i]->reset_aggregated_data();  # Reset for next iteration.

      # Print header report only once.  So remove it from the
      # list of reports after the first groupby's reports.
      if ( $i == 0 ) {
         @reports = grep { $_ ne 'header' } @reports;
      }

   } # Each groupby

   if ( $o->get('pipeline-profile') ) {
      my $report = new ReportFormatter(
         line_width => 74,
      );
      $report->set_columns(
         { name => 'Process'                   },
         { name => 'Time',  right_justify => 1 },
         { name => 'Count', right_justify => 1 },
      );
      $report->set_title('Pipeline profile');
      my $instrument = $pipeline->instrumentation;
      my $total_time = $instrument->{Pipeline};
      foreach my $process_name ( $pipeline->processes() ) {
         my $t    = $instrument->{$process_name}->{time} || 0;
         my $tp   = sprintf('%.2f %4.1f%%', $t, $t / ($total_time || 1) * 100);
         $report->add_line($process_name, $tp,
            $instrument->{$process_name}->{count} || 0);
      }
      # Reset profile for next iteration.
      $pipeline->reset();

      print "\n" . $report->get_report();
   }

   return;
}

# Pass in the currently open $dbh (if any), where $current points to ('execute'
# or 'processlist') and whether you want to be connected to the read_only
# server.  Get back which server you're looking at, and the $dbh.  Assumes that
# one of the servers is ALWAYS read only and the other is ALWAYS not!  If
# there's some transition period where this isn't true, maybe both will end up
# pointing to the same place, but that should resolve shortly.
# The magic switching functionality only works if --mirror is given!  Otherwise
# it just returns the correct $dbh.  $comment is some descriptive text for
# debuggin, like 'for --execute'.
sub find_role { 
   my ( %args ) = @_;
   my $o         = $args{OptionParser};
   my $dp        = $args{DSNParser};
   my $dbh       = $args{dbh};
   my $current   = $args{current};
   my $read_only = $args{read_only};
   my $comment   = $args{comment};

   if ( !$dbh || !$dbh->ping ) {
      MKDEBUG && _d('Getting a dbh from', $current, $comment);
      $dbh = $dp->get_dbh(
         $dp->get_cxn_params($o->get($current)), {AutoCommit => 1});
      $dbh->{InactiveDestroy}  = 1;  # Don't die on fork().
   }
   if ( $o->get('mirror') ) {
      my ( $is_read_only ) = $dbh->selectrow_array('SELECT @@global.read_only');
      MKDEBUG && _d("read_only on", $current, $comment, ':',
                    $is_read_only, '(want', $read_only, ')');
      if ( $is_read_only != $read_only ) {
         $current = $current eq 'execute' ? 'processlist' : 'execute';
         MKDEBUG && _d("read_only wrong", $comment, "getting a dbh from", $current);
         $dbh = $dp->get_dbh(
            $dp->get_cxn_params($o->get($current)), {AutoCommit => 1});
         $dbh->{InactiveDestroy}  = 1;  # Don't die on fork().
      }
   }
   return ($current, $dbh);
}

# Catches signals so we can exit gracefully.
sub sig_int {
   my ( $signal ) = @_;
   if ( $oktorun ) {
      print STDERR "# Caught SIG$signal.\n";
      $oktorun = 0;
   }
   else {
      print STDERR "# Exiting on SIG$signal.\n";
      exit(1);
   }
}

sub make_alt_attrib {
   my ( $alt_attrib ) = @_;
   my @alts   = split('\|', $alt_attrib);
   my $attrib = shift @alts;
   MKDEBUG && _d('Primary attrib:', $attrib, 'aliases:', @alts);
   my @lines;
   push @lines,
      'sub { my ( $args ) = @_; ',
      'my $event = $args->{event}; ',
      "if ( exists \$event->{'$attrib'} ) { ",
      (map { "delete \$event->{'$_'}; "; } @alts),
      'return $args; }',     
      # Primary attrib doesn't exist; look for alts
      (map {
         "if ( exists \$event->{'$_'} ) { "
         . "\$event->{'$attrib'} = \$event->{'$_'}; "
         . "delete \$event->{'$_'}; "
         . 'return $args; }';
      } @alts),
      'return $args; }';
   MKDEBUG && _d('attrib alias sub for', $attrib, ':', @lines);
   my $sub = eval join("\n", @lines);
   die if $EVAL_ERROR;
   return $sub;
}

# Checks that the orderby attrib exists in the ea, returns the default
# orderby attrib if not.
sub check_orderby_attrib {
   my ( $orderby_attrib, $ea, $o ) = @_;

   if ( !$ea->type_for($orderby_attrib) && $orderby_attrib ne 'Query_time' ) {
      my $default_orderby = $o->get_defaults()->{'order-by'};

      # Print the notice only if the query report is being printed, too.
      if ( grep { $_ eq 'query_report' } @{$o->get('report-format')} ) {
         print "--order-by attribute $orderby_attrib doesn't exist, "
            . "using $default_orderby\n";
      }

      # Fall back to the default orderby attrib.
      ( $orderby_attrib, undef ) = split(/:/, $default_orderby);
   }

   MKDEBUG && _d('orderby attrib:', $orderby_attrib);
   return $orderby_attrib;
}

# Read the fh and timeout after t seconds.
sub read_timeout {
   my ( $fh, $t ) = @_;
   return unless $fh;
   $t ||= 0;  # will reset alarm and cause read to wait forever

   # Set the SIGALRM handler.
   my $mask   = POSIX::SigSet->new(&POSIX::SIGALRM);
   my $action = POSIX::SigAction->new(
      sub {
         # This sub is called when a SIGALRM is received.
         die 'read timeout';
      },
      $mask,
   );
   my $oldaction = POSIX::SigAction->new();
   sigaction(&POSIX::SIGALRM, $action, $oldaction);

   my $res;
   eval {
      alarm $t;
      $res = <$fh>;
      alarm 0;
   };
   if ( $EVAL_ERROR ) {
      MKDEBUG && _d('Read error:', $EVAL_ERROR);
      die $EVAL_ERROR unless $EVAL_ERROR =~ m/read timeout/;
      $oktorun = 0;
      $res     = undef;  # res is a blank string after a timeout
   }
   return $res;
}

sub get_cxn {
   my ( %args ) = @_;
   my @required_args = qw(dsn OptionParser DSNParser);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($dsn, $o, $dp) = @args{@required_args};

   if ( $o->get('ask-pass') ) {
      $dsn->{p} = OptionParser::prompt_noecho("Enter password "
         . ($args{for} ? "for $args{for}: " : ": "));
   }

   my $dbh = $dp->get_dbh($dp->get_cxn_params($dsn), $args{opts});
   MKDEBUG && _d('Connected dbh', $dbh);
   return $dbh;
}

sub get_worst_queries {
   my ( %args ) = @_;
   my $o              = $args{OptionParser};
   my $ea             = $args{ea};
   my $orderby_attrib = $args{orderby_attrib};
   my $orderby_func   = $args{orderby_func};
   my $limit          = $args{limit};
   my $outliers       = $args{outliers};

   # We don't report on all queries, just the worst, i.e. the top
   # however many.
   my ($total, $count);
   if ( $limit =~ m/^\d+$/ ) {
      $count = $limit;
   }
   else {
      # It's a percentage, so grab as many as needed to get to
      # that % of the file.
      ($total, $count) = $limit =~ m/(\d+)/g;
      $total *= ($ea->results->{globals}->{$orderby_attrib}->{sum} || 0) / 100;
   }
   my %top_spec = (
      attrib  => $orderby_attrib,
      orderby => $orderby_func || 'cnt',
      total   => $total,
      count   => $count,
   );
   if ( $args{outliers} ) {
      @top_spec{qw(ol_attrib ol_limit ol_freq)}
         = split(/:/, $args{outliers});
   }

   # The queries that will be reported.
   return $ea->top_events(%top_spec);
}

sub print_table_access_report {
   my ( %args ) = @_;
   my @required_args = qw(ea worst QueryParser QueryRewriter OptionParser Quoter);
   foreach my $arg ( @required_args ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my ($ea, $worst, $qp, $qr, $o, $q) = @args{@required_args};

   my %seen;
   MKDEBUG && _d('Doing table access report');

   foreach my $worst_info ( @$worst ) {
      my $item         = $worst_info->[0];
      my $stats        = $ea->results->{classes}->{$item};
      my $sample       = $ea->results->{samples}->{$item};
      my $samp_query   = $sample->{arg} || '';
      my ($default_db) = $sample->{db}       ? $sample->{db}
                       : $stats->{db}->{unq} ? keys %{$stats->{db}->{unq}}
                       :                       undef;
      eval {
         QUERY:
         foreach my $query ( $qp->split($samp_query) ) {
            my $rw = $qp->query_type($query, $qr)->{rw};
            next QUERY unless $rw;
            my @tables = $qp->extract_tables(
               query      => $query,
               default_db => $default_db,
               Quoter     => $args{Quoter},
            );
            next QUERY unless scalar @tables;
            DB_TBL:
            foreach my $tbl_info ( @tables ) {
               my ($db, $tbl) = @$tbl_info;
               $db            = $db ? "`$db`."  : '';
               next DB_TBL if $seen{"$db$tbl"}++; # Unique-ify for issue 337.
               print "$rw $db`$tbl`\n";
            }
         }
      };
      if ( $EVAL_ERROR ) {
         MKDEBUG && _d($EVAL_ERROR);
         warn "Cannot get table access for query $_";
      }
   }

   return;
}

sub update_query_review_tables {
   my ( %args ) = @_;
   foreach my $arg ( qw(ea worst QueryReview OptionParser) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $ea    = $args{ea};
   my $worst = $args{worst};
   my $qv    = $args{QueryReview};
   my $o     = $args{OptionParser};

   my $attribs = $ea->get_attributes();

   MKDEBUG && _d('Updating query review tables'); 

   foreach my $worst_info ( @$worst ) {
      my $item        = $worst_info->[0];
      my $stats       = $ea->results->{classes}->{$item};
      my $sample      = $ea->results->{samples}->{$item};
      my $review_vals = $qv->get_review_info($item);
      $qv->set_review_info(
         fingerprint => $item,
         sample      => $sample->{arg} || '',
         first_seen  => $stats->{ts}->{min},
         last_seen   => $stats->{ts}->{max}
      );
      if ( $o->get('review-history') ) {
         my %history;
         foreach my $attrib ( @$attribs ) {
            $history{$attrib} = $ea->metrics(
               attrib => $attrib,
               where  => $item,
            );
         }
         $qv->set_review_history(
            $item, $sample->{arg} || '', %history);
      }
   }

   return;
}

# Save EventAggregator (ea) results to file.  To reconstruct an ea
# later, the following info is saved, in this format:
#   groupby (e.g. fingerprint)
#
#   worst  (e.g. Query_time)
#
#   attribute types (hashref with attrib=>type for each attrib)
#
#   results (3 hashrefs for classes, globals and samples)
# Each bit of info is separated by a blank line so the program that
# loads them can easily parse one from the other ($INPUT_RECORD_SEPARATOR='').
sub save_results {
   my ( %args ) = @_;
   foreach my $arg ( qw(ea worst file) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $ea      = $args{ea};
   my $results = $ea->results();
   my $worst   = $args{worst};
   my $file    = $args{file};
   return unless $file;
   MKDEBUG && _d('Saving results to', $file);

   my $ea_info = {
      groupby         => $ea->{groupby},
      worst           => $ea->{worst},
      attribute_types => $ea->attributes(),
      results         => { 
         classes => {},
         globals => $results->{globals},
         samples => {},
      }
   };
   # Shallow copy of worst results (don't dump all results).
   foreach my $item ( @$worst ) {
      my $where = $item->[0];
      $ea_info->{results}->{classes}->{$where} = $results->{classes}->{$where};
      $ea_info->{results}->{samples}->{$where} = $results->{samples}->{$where};
   }

   my ($fh, $zfh);  # filehandle, gzip filehandle
   $file .= '.gz' if $args{gzip};
   open $fh, '>', $file;
   if ( !$fh ) {
      warn "Cannot open $file for --save-results: $OS_ERROR";
      return;
   }
   if ( $args{gzip} ) {
      our $GzipError;
      $zfh = new IO::Compress::Gzip($fh);
      if ( !$zfh ) {
         warn "Cannot open gzip filehandle on $file for --save-results: "
            . $GzipError;
         close $fh if $fh;
         return;
      }
   }
   else {
      $zfh = $fh;
   }

   local $Data::Dumper::Indent    = 0;
   local $Data::Dumper::Sortkeys  = 1;
   local $Data::Dumper::Quotekeys = 0;
   local $Data::Dumper::Purity    = 1;

   print $zfh Dumper($ea_info);
   close $zfh;
   close $fh if $fh;

   return;
}

# Sub: verify_run_time
#   Verify that the given run mode and run time are valid.  If the run mode
#   is "interval", the time boundary (in seconds) for the run time is returned
#   if valid.  Else, undef is returned because modes "clock" and "event" have
#   no boundaries that need to be verified.  In any case the sub will die if
#   something is invalid, so the caller should eval their call.  The eval
#   error message is suitable for <OptionParser::save_error()>.
#
# Parameters:
#   %args - Arguments
#
# Required Arguments:
#   run_mode - Name of run mode (e.g. "clock", "event" or "interval")
#   run_time - Run time in seconds
#
# Returns:
#   Time boundary in seconds if run mode and time are valid; dies if
#   they are not.  Time boundary is undef except for interval run mode.
sub verify_run_time {
   my ( %args ) = @_;
   my $run_mode = lc $args{run_mode};
   my $run_time = defined $args{run_time} ? lc $args{run_time} : undef;
   MKDEBUG && _d("Verifying run time mode", $run_mode, "and time", $run_time);

   die "Invalid --run-time-mode: $run_mode\n"
      unless $run_mode =~ m/clock|event|interval/;

   if ( defined $run_time && $run_time < 0 ) {
      die "--run-time must be greater than zero\n";
   }

   my $boundary;
   if ( $run_mode eq 'interval' ) {
      if ( !defined $run_time || $run_time <= 0 ) {
         die "--run-time must be greater than zero for "
            . "--run-time-mode $run_mode\n";
      }

      if ( $run_time > 86400 ) {  # 1 day
         # Make sure run time is a whole day and not something like 25h.
         if ( $run_time % 86400 ) {
            die "Invalid --run-time argument for --run-time-mode $run_mode; "
            . "see documentation.\n"
         }
         $boundary = $run_time;
      }
      else {
         # If run time is sub-minute (some amount of seconds), it should
         # divide evenly into minute boundaries.  If it's sub-minute
         # (some amount of minutes), it should divide evenly into hour
         # boundaries.  If it's sub-hour, it should divide eventy into
         # day boundaries.
         $boundary = $run_time <= 60   ? 60     # seconds divide into minutes
                   : $run_time <= 3600 ? 3600   # minutes divide into hours
                   :                     86400; # hours divide into days
         if ( $boundary % $run_time ) {
            die "Invalid --run-time argument for --run-time-mode $run_mode; "
               . "see documentation.\n"
         }
      }
   }

   return $boundary;
}

sub _d {
   my ($package, undef, $line) = caller 0;
   @_ = map { (my $temp = $_) =~ s/\n/\n# /g; $temp; }
        map { defined $_ ? $_ : 'undef' }
        @_;
   print STDERR "# $package:$line $PID ", join(' ', @_), "\n";
}

# ############################################################################
# Run the program.
# ############################################################################
if ( !caller ) { exit main(@ARGV); }

1; # Because this is a module as well as a script.

# #############################################################################
# Documentation.
# #############################################################################

=pod

=head1 NAME

mk-query-digest - Analyze query execution logs and generate a query report,
filter, replay, or transform queries for MySQL, PostgreSQL, memcached, and more.

=head1 SYNOPSIS

Usage: mk-query-digest [OPTION...] [FILE]

mk-query-digest parses and analyzes MySQL log files.  With no FILE, or when
FILE is -, it read standard input.

Analyze, aggregate, and report on a slow query log:

 mk-query-digest /path/to/slow.log

Review a slow log, saving results to the test.query_review table in a MySQL
server running on host1.  See L<"--review"> for more on reviewing queries:

 mk-query-digest --review h=host1,D=test,t=query_review /path/to/slow.log

Filter out everything but SELECT queries, replay the queries against another
server, then use the timings from replaying them to analyze their performance:

 mk-query-digest /path/to/slow.log --execute h=another_server \
   --filter '$event->{fingerprint} =~ m/^select/'

Print the structure of events so you can construct a complex L<"--filter">:

 mk-query-digest /path/to/slow.log --no-report \
   --filter 'print Dumper($event)'

Watch SHOW FULL PROCESSLIST and output a log in slow query log format:

 mk-query-digest --processlist h=host1 --print --no-report

The default aggregation and analysis is CPU and memory intensive.  Disable it if
you don't need the default report:

 mk-query-digest <arguments> --no-report

=head1 RISKS

The following section is included to inform users about the potential risks,
whether known or unknown, of using this tool.  The two main categories of risks
are those created by the nature of the tool (e.g. read-only tools vs. read-write
tools) and those created by bugs.

By default mk-query-digest merely collects and aggregates data from the files
specified.  It is designed to be as efficient as possible, but depending on the
input you give it, it can use a lot of CPU and memory.  Practically speaking, it
is safe to run even on production systems, but you might want to monitor it
until you are satisfied that the input you give it does not cause undue load.

Various options will cause mk-query-digest to insert data into tables, execute
SQL queries, and so on.  These include the L<"--execute"> option and
L<"--review">.

At the time of this release, we know of no bugs that could cause serious harm
to users.

The authoritative source for updated information is always the online issue
tracking system.  Issues that affect this tool will be marked as such.  You can
see a list of such issues at the following URL:
L<http://www.maatkit.org/bugs/mk-query-digest>.

See also L<"BUGS"> for more information on filing bugs and getting help.

=head1 DESCRIPTION

This tool was formerly known as mk-log-parser.

C<mk-query-digest> is a framework for doing things with events from a query
source such as the slow query log or PROCESSLIST.  By default it acts as a very
sophisticated log analysis tool.  You can group and sort queries in many
different ways simultaneously and find the most expensive queries, or create a
timeline of queries in the log, for example.  It can also do a "query review,"
which means to save a sample of each type of query into a MySQL table so you can
easily see whether you've reviewed and analyzed a query before.  The benefit of
this is that you can keep track of changes to your server's queries and avoid
repeated work.  You can also save other information with the queries, such as
comments, issue numbers in your ticketing system, and so on.

Note that this is a work in *very* active progress and you should expect
incompatible changes in the future.

=head1 ATTRIBUTES

mk-query-digest works on events, which are a collection of key/value pairs
called attributes.  You'll recognize most of the attributes right away:
Query_time, Lock_time, and so on.  You can just look at a slow log and see them.
However, there are some that don't exist in the slow log, and slow logs
may actually include different kinds of attributes (for example, you may have a
server with the Percona patches).

For a full list of attributes, see
L<http://code.google.com/p/maatkit/wiki/EventAttributes>.

With creative use of L<"--filter">, you can create new attributes derived
from existing attributes.  For example, to create an attribute called
C<Row_ratio> for examining the ratio of C<Rows_sent> to C<Rows_examined>,
specify a filter like:

  --filter '($event->{Row_ratio} = $event->{Rows_sent} / ($event->{Rows_examined})) && 1'

The C<&& 1> trick is needed to create a valid one-line syntax that is always
true, even if the assignment happens to evaluate false.  The new attribute will
automatically appears in the output:

  # Row ratio           1.00    0.00       1    0.50       1    0.71    0.50

Attributes created this way can be specified for L<"--order-by"> or any
option that requires an attribute.

=head2 memcached

memcached events have additional attributes related to the memcached protocol:
cmd, key, res (result) and val.  Also, boolean attributes are created for
the various commands, misses and errors: Memc_CMD where CMD is a memcached
command (get, set, delete, etc.), Memc_error and Memc_miss.

These attributes are no different from slow log attributes, so you can use them
with L<"--[no]report">, L<"--group-by">, in a L<"--filter">, etc.

These attributes and more are documented at
L<http://code.google.com/p/maatkit/wiki/EventAttributes>.

=head1 OUTPUT

The default output is a query analysis report.  The L<"--[no]report"> option
controls whether or not this report is printed.  Sometimes you may wish to
parse all the queries but suppress the report, for example when using
L<"--print">, L<"--review"> or L<"--save-results">.

There is one paragraph for each class of query analyzed.  A "class" of queries
all have the same value for the L<"--group-by"> attribute which is
"fingerprint" by default.  (See L<"ATTRIBUTES">.)  A fingerprint is an
abstracted version of the query text with literals removed, whitespace
collapsed, and so forth.  The report is formatted so it's easy to paste into
emails without wrapping, and all non-query lines begin with a comment, so you
can save it to a .sql file and open it in your favorite syntax-highlighting
text editor.  There is a response-time profile at the beginning.

The output described here is controlled by L<"--report-format">.
That option allows you to specify what to print and in what order.
The default output in the default order is described here.

The report, by default, begins with a paragraph about the entire analysis run
The information is very similar to what you'll see for each class of queries in
the log, but it doesn't have some information that would be too expensive to
keep globally for the analysis.  It also has some statistics about the code's
execution itself, such as the CPU and memory usage, the local date and time
of the run, and a list of input file read/parsed.

Following this is the response-time profile over the events.  This is a
highly summarized view of the unique events in the detailed query report
that follows.  It contains the following columns:

 Column        Meaning
 ============  ==========================================================
 Rank          The query's rank within the entire set of queries analyzed
 Query ID      The query's fingerprint
 Response time The total response time, and percentage of overall total
 Calls         The number of times this query was executed
 R/Call        The mean response time per execution
 Apdx          The Apdex score; see --apdex-threshold for details
 V/M           The Variance-to-mean ratio of response time
 EXPLAIN       If --explain was specified, a sparkline; see --explain
 Item          The distilled query

A final line whose rank is shown as MISC contains aggregate statistics on the
queries that were not included in the report, due to options such as
L<"--limit"> and L<"--outliers">.  For details on the variance-to-mean ratio,
please see http://en.wikipedia.org/wiki/Index_of_dispersion.

Next, the detailed query report is printed.  Each query appears in a paragraph.
Here is a sample, slightly reformatted so 'perldoc' will not wrap lines in a
terminal.  The following will all be one paragraph, but we'll break it up for
commentary.

 # Query 2: 0.01 QPS, 0.02x conc, ID 0xFDEA8D2993C9CAF3 at byte 160665

This line identifies the sequential number of the query in the sort order
specified by L<"--order-by">.  Then there's the queries per second, and the
approximate concurrency for this query (calculated as a function of the timespan
and total Query_time).  Next there's a query ID.  This ID is a hex version of
the query's checksum in the database, if you're using L<"--review">.  You can
select the reviewed query's details from the database with a query like C<SELECT
.... WHERE checksum=0xFDEA8D2993C9CAF3>.  

If you are investigating the report and want to print out every sample of a
particular query, then the following L<"--filter"> may be helpful:
C<mk-query-digest slow-log.log --no-report --print --filter '$event->{fingerprint} 
&& make_checksum($event->{fingerprint}) eq "FDEA8D2993C9CAF3"'>. 

Notice that you must remove the 0x prefix from the checksum in order for this to work.

Finally, in case you want to find a sample of the query in the log file, there's
the byte offset where you can look.  (This is not always accurate, due to some
silly anomalies in the slow-log format, but it's usually right.)  The position
refers to the worst sample, which we'll see more about below.

Next is the table of metrics about this class of queries.

 #           pct   total    min    max     avg     95%  stddev  median
 # Count       0       2
 # Exec time  13   1105s   552s   554s    553s    554s      2s    553s
 # Lock time   0   216us   99us  117us   108us   117us    12us   108us
 # Rows sent  20   6.26M  3.13M  3.13M   3.13M   3.13M   12.73   3.13M
 # Rows exam   0   6.26M  3.13M  3.13M   3.13M   3.13M   12.73   3.13M

The first line is column headers for the table.  The percentage is the percent
of the total for the whole analysis run, and the total is the actual value of
the specified metric.  For example, in this case we can see that the query
executed 2 times, which is 13% of the total number of queries in the file.  The
min, max and avg columns are self-explanatory.  The 95% column shows the 95th
percentile; 95% of the values are less than or equal to this value.  The
standard deviation shows you how tightly grouped the values are.  The standard
deviation and median are both calculated from the 95th percentile, discarding
the extremely large values.

The stddev, median and 95th percentile statistics are approximate.  Exact
statistics require keeping every value seen, sorting, and doing some
calculations on them.  This uses a lot of memory.  To avoid this, we keep 1000
buckets, each of them 5% bigger than the one before, ranging from .000001 up to
a very big number.  When we see a value we increment the bucket into which it
falls.  Thus we have fixed memory per class of queries.  The drawback is the
imprecision, which typically falls in the 5 percent range.

Next we have statistics on the users, databases and time range for the query.

 # Users       1   user1
 # Databases   2     db1(1), db2(1)
 # Time range 2008-11-26 04:55:18 to 2008-11-27 00:15:15

The users and databases are shown as a count of distinct values, followed by the
values.  If there's only one, it's shown alone; if there are many, we show each
of the most frequent ones, followed by the number of times it appears.

 # Query_time distribution
 #   1us
 #  10us
 # 100us
 #   1ms
 #  10ms
 # 100ms
 #    1s
 #  10s+  #############################################################

The execution times show a logarithmic chart of time clustering.  Each query
goes into one of the "buckets" and is counted up.  The buckets are powers of
ten.  The first bucket is all values in the "single microsecond range" -- that
is, less than 10us.  The second is "tens of microseconds," which is from 10us
up to (but not including) 100us; and so on.  The charted attribute can be
changed by specifying L<"--report-histogram"> but is limited to time-based
attributes.

 # Tables
 #    SHOW TABLE STATUS LIKE 'table1'\G
 #    SHOW CREATE TABLE `table1`\G
 # EXPLAIN
 SELECT * FROM table1\G

This section is a convenience: if you're trying to optimize the queries you see
in the slow log, you probably want to examine the table structure and size.
These are copy-and-paste-ready commands to do that.

Finally, we see a sample of the queries in this class of query.  This is not a
random sample.  It is the query that performed the worst, according to the sort
order given by L<"--order-by">.  You will normally see a commented C<# EXPLAIN>
line just before it, so you can copy-paste the query to examine its EXPLAIN
plan. But for non-SELECT queries that isn't possible to do, so the tool tries to
transform the query into a roughly equivalent SELECT query, and adds that below.

If you want to find this sample event in the log, use the offset mentioned
above, and something like the following:

  tail -c +<offset> /path/to/file | head

See also L<"--report-format">.

=head2 SPARKLINES

The output also contains sparklines.  Sparklines are "data-intense,
design-simple, word-sized graphics" (L<http://en.wikipedia.org/wiki/Sparkline>).There is a sparkline for L<"--report-histogram"> and for L<"--explain">.
See each of those options for details about interpreting their sparklines.

=head1 QUERY REVIEWS

A "query review" is the process of storing all the query fingerprints analyzed.
This has several benefits:

=over

=item *

You can add meta-data to classes of queries, such as marking them for follow-up,
adding notes to queries, or marking them with an issue ID for your issue
tracking system.

=item *

You can refer to the stored values on subsequent runs so you'll know whether
you've seen a query before.  This can help you cut down on duplicated work.

=item *

You can store historical data such as the row count, query times, and generally
anything you can see in the report.

=back

To use this feature, you run mk-query-digest with the L<"--review"> option.  It
will store the fingerprints and other information into the table you specify.
Next time you run it with the same option, it will do the following:

=over

=item *

It won't show you queries you've already reviewed.  A query is considered to be
already reviewed if you've set a value for the C<reviewed_by> column.  (If you
want to see queries you've already reviewed, use the L<"--report-all"> option.)

=item *

Queries that you've reviewed, and don't appear in the output, will cause gaps in
the query number sequence in the first line of each paragraph.  And the value
you've specified for L<"--limit"> will still be honored.  So if you've reviewed all
queries in the top 10 and you ask for the top 10, you won't see anything in the
output.

=item *

If you want to see the queries you've already reviewed, you can specify
L<"--report-all">.  Then you'll see the normal analysis output, but you'll also see
the information from the review table, just below the execution time graph.  For
example,

  # Review information
  #      comments: really bad IN() subquery, fix soon!
  #    first_seen: 2008-12-01 11:48:57
  #   jira_ticket: 1933
  #     last_seen: 2008-12-18 11:49:07
  #      priority: high
  #   reviewed_by: xaprb
  #   reviewed_on: 2008-12-18 15:03:11

You can see how useful this meta-data is -- as you analyze your queries, you get
your comments integrated right into the report.

If you add the L<"--review-history"> option, it will also store information into
a separate database table, so you can keep historical trending information on
classes of queries.

=back

=head1 FINGERPRINTS

A query fingerprint is the abstracted form of a query, which makes it possible
to group similar queries together.  Abstracting a query removes literal values,
normalizes whitespace, and so on.  For example, consider these two queries:

  SELECT name, password FROM user WHERE id='12823';
  select name,   password from user
     where id=5;

Both of those queries will fingerprint to

  select name, password from user where id=?

Once the query's fingerprint is known, we can then talk about a query as though
it represents all similar queries.

What C<mk-query-digest> does is analogous to a GROUP BY statement in SQL.  (But
note that "multiple columns" doesn't define a multi-column grouping; it defines
multiple reports!) If your command-line looks like this,

  mk-query-digest /path/to/slow.log --select Rows_read,Rows_sent \
      --group-by fingerprint --order-by Query_time:sum --limit 10

The corresponding pseudo-SQL looks like this:

  SELECT WORST(query BY Query_time), SUM(Query_time), ...
  FROM /path/to/slow.log
  GROUP BY FINGERPRINT(query)
  ORDER BY SUM(Query_time) DESC
  LIMIT 10

You can also use the value C<distill>, which is a kind of super-fingerprint.
See L<"--group-by"> for more.

When parsing memcached input (L<"--type"> memcached), the fingerprint is an
abstracted version of the command and key, with placeholders removed.  For
example, "get user_123_preferences" fingerprints to "get user_?_preferences".
There is also a "key_print" which a fingerprinted version of the key.  This
example's key_print is "user_?_preferences".

Query fingerprinting accommodates a great many special cases, which have proven
necessary in the real world.  For example, an IN list with 5 literals is really
equivalent to one with 4 literals, so lists of literals are collapsed to a
single one.  If you want to understand more about how and why all of these cases
are handled, please review the test cases in the Subversion repository.  If you
find something that is not fingerprinted properly, please submit a bug report
with a reproducible test case.  Here is a list of transformations during
fingerprinting, which might not be exhaustive:

=over

=item *

Group all SELECT queries from mysqldump together, even if they are against
different tables.  Ditto for all of mk-table-checksum's checksum queries.

=item *

Shorten multi-value INSERT statements to a single VALUES() list.

=item *

Strip comments.

=item *

Abstract the databases in USE statements, so all USE statements are grouped
together.

=item *

Replace all literals, such as quoted strings.  For efficiency, the code that
replaces literal numbers is somewhat non-selective, and might replace some
things as numbers when they really are not.  Hexadecimal literals are also
replaced.  NULL is treated as a literal.  Numbers embedded in identifiers are
also replaced, so tables named similarly will be fingerprinted to the same
values (e.g. users_2009 and users_2010 will fingerprint identically).

=item *

Collapse all whitespace into a single space.

=item *

Lowercase the entire query.

=item *

Replace all literals inside of IN() and VALUES() lists with a single
placeholder, regardless of cardinality.

=item *

Collapse multiple identical UNION queries into a single one.

=back

=head1 OPTIONS

DSN values in L<"--review-history"> default to values in L<"--review"> if COPY
is yes.

This tool accepts additional command-line arguments.  Refer to the
L<"SYNOPSIS"> and usage information for details.

=over

=item --apdex-threshold

type: float; default: 1.0

Set Apdex target threshold (T) for query response time.  The Application
Performance Index (Apdex) Technical Specification V1.1 defines T as "a
positive decimal value in seconds, having no more than two significant digits
of granularity."  This value only applies to query response time (Query_time).

Options can be abbreviated so specifying C<--apdex-t> also works.

See L<http://www.apdex.org/>.

=item --ask-pass

Prompt for a password when connecting to MySQL.

=item --attribute-aliases

type: array; default: db|Schema

List of attribute|alias,etc.

Certain attributes have multiple names, like db and Schema.  If an event does
not have the primary attribute, mk-query-digest looks for an alias attribute.
If it finds an alias, it creates the primary attribute with the alias
attribute's value and removes the alias attribute.

If the event has the primary attribute, all alias attributes are deleted.

This helps simplify event attributes so that, for example, there will not
be report lines for both db and Schema.

=item --attribute-value-limit

type: int; default: 4294967296

A sanity limit for attribute values.

This option deals with bugs in slow-logging functionality that causes large
values for attributes.  If the attribute's value is bigger than this, the
last-seen value for that class of query is used instead.

=item --aux-dsn

type: DSN

Auxiliary DSN used for special options.

The following options may require a DSN even when only parsing a slow log file:

  * --since
  * --until

See each option for why it might require a DSN.

=item --charset

short form: -A; type: string

Default character set.  If the value is utf8, sets Perl's binmode on
STDOUT to utf8, passes the mysql_enable_utf8 option to DBD::mysql, and
runs SET NAMES UTF8 after connecting to MySQL.  Any other value sets
binmode on STDOUT without the utf8 layer, and runs SET NAMES after
connecting to MySQL.

=item --check-attributes-limit

type: int; default: 1000

Stop checking for new attributes after this many events.

For better speed, mk-query-digest stops checking events for new attributes
after a certain number of events.  Any new attributes after this number
will be ignored and will not be reported.

One special case is new attributes for pre-existing query classes
(see L<"--group-by"> about query classes).  New attributes will not be added
to pre-existing query classes even if the attributes are detected before the
L<"--check-attributes-limit"> limit.

=item --config

type: Array

Read this comma-separated list of config files; if specified, this must be the
first option on the command line.

=item --[no]continue-on-error

default: yes

Continue parsing even if there is an error.

=item --create-review-history-table

Create the L<"--review-history"> table if it does not exist.

This option causes the table specified by L<"--review-history"> to be created
with the default structure shown in the documentation for that option.

=item --create-review-table

Create the L<"--review"> table if it does not exist.

This option causes the table specified by L<"--review"> to be created with the
default structure shown in the documentation for that option.

=item --daemonize

Fork to the background and detach from the shell.  POSIX
operating systems only.

=item --defaults-file

short form: -F; type: string

Only read mysql options from the given file.  You must give an absolute pathname.

=item --embedded-attributes

type: array

Two Perl regex patterns to capture pseudo-attributes embedded in queries.

Embedded attributes might be special attribute-value pairs that you've hidden
in comments.  The first regex should match the entire set of attributes (in
case there are multiple).  The second regex should match and capture
attribute-value pairs from the first regex.

For example, suppose your query looks like the following:

  SELECT * from users -- file: /login.php, line: 493;

You might run mk-query-digest with the following option:

  mk-query-digest --embedded-attributes ' -- .*','(\w+): ([^\,]+)'

The first regular expression captures the whole comment:

  " -- file: /login.php, line: 493;"

The second one splits it into attribute-value pairs and adds them to the event:

   ATTRIBUTE  VALUE
   =========  ==========
   file       /login.php
   line       493

B<NOTE>: All commas in the regex patterns must be escaped with \ otherwise
the pattern will break.

=item --execute

type: DSN

Execute queries on this DSN.

Adds a callback into the chain, after filters but before the reports.  Events
are executed on this DSN.  If they are successful, the time they take to execute
overwrites the event's Query_time attribute and the original Query_time value
(from the log) is saved as the Exec_orig_time attribute.  If unsuccessful,
the callback returns false and terminates the chain.

If the connection fails, mk-query-digest tries to reconnect once per second.

See also L<"--mirror"> and L<"--execute-throttle">.

=item --execute-throttle

type: array

Throttle values for L<"--execute">.

By default L<"--execute"> runs without any limitations or concerns for the
amount of time that it takes to execute the events.  The L<"--execute-throttle">
allows you to limit the amount of time spent doing L<"--execute"> relative
to the other processes that handle events.  This works by marking some events
with a C<Skip_exec> attribute when L<"--execute"> begins to take too much time.
L<"--execute"> will not execute an event if this attribute is true.  This
indirectly decreases the time spent doing L<"--execute">.

The L<"--execute-throttle"> option takes at least two comma-separated values:
max allowed L<"--execute"> time as a percentage and a check interval time.  An
optional third value is a percentage step for increasing and decreasing the
probability that an event will be marked C<Skip_exec> true.  5 (percent) is
the default step.

For example: L<"--execute-throttle"> C<70,60,10>.  This will limit
L<"--execute"> to 70% of total event processing time, checked every minute
(60 seconds) and probability stepped up and down by 10%.  When L<"--execute">
exceeds 70%, the probability that events will be marked C<Skip_exec> true
increases by 10%. L<"--execute"> time is checked again after another minute.
If it's still above 70%, then the probability will increase another 10%.
Or, if it's dropped below 70%, then the probability will decrease by 10%.

=item --expected-range

type: array; default: 5,10

Explain items when there are more or fewer than expected.

Defines the number of items expected to be seen in the report given by
L<"--[no]report">, as controlled by L<"--limit"> and L<"--outliers">.  If
there  are more or fewer items in the report, each one will explain why it was
included.

=item --explain

type: DSN

Run EXPLAIN for the sample query with this DSN and print results.

This works only when L<"--group-by"> includes fingerprint.  It causes
mk-query-digest to run EXPLAIN and include the output into the report.  For
safety, queries that appear to have a subquery that EXPLAIN will execute won't
be EXPLAINed.  Those are typically "derived table" queries of the form

  select ... from ( select .... ) der;

The EXPLAIN results are printed in three places: a sparkline in the event
header, a full vertical format in the event report, and a sparkline in the
profile.

The full format appears at the end of each event report in vertical style
(C<\G>) just like MySQL prints it.

The sparklines (see L<"SPARKLINES">) are compact representations of the
access type for each table and whether or not "Using temporary" or "Using
filesort" appear in EXPLAIN.  The sparklines look like:

  nr>TF

That sparkline means that there are two tables, the first uses a range (n)
access, the second uses a ref access, and both "Using temporary" (T) and
"Using filesort" (F) appear.  The greater-than character just separates table
access codes from T and/or F.

The abbreviated table access codes are:

  a  ALL
  c  const
  e  eq_ref
  f  fulltext
  i  index
  m  index_merge
  n  range
  o  ref_or_null
  r  ref
  s  system
  u  unique_subquery

A capitalized access code means that "Using index" appears in EXPLAIN for
that table.

=item --filter

type: string

Discard events for which this Perl code doesn't return true.

This option is a string of Perl code or a file containing Perl code that gets
compiled into a subroutine with one argument: $event.  This is a hashref.
If the given value is a readable file, then mk-query-digest reads the entire
file and uses its contents as the code.  The file should not contain
a shebang (#!/usr/bin/perl) line.

If the code returns true, the chain of callbacks continues; otherwise it ends.
The code is the last statement in the subroutine other than C<return $event>. 
The subroutine template is:

  sub { $event = shift; filter && return $event; }

Filters given on the command line are wrapped inside parentheses like like
C<( filter )>.  For complex, multi-line filters, you must put the code inside
a file so it will not be wrapped inside parentheses.  Either way, the filter
must produce syntactically valid code given the template.  For example, an
if-else branch given on the command line would not be valid:

  --filter 'if () { } else { }'  # WRONG

Since it's given on the command line, the if-else branch would be wrapped inside
parentheses which is not syntactically valid.  So to accomplish something more
complex like this would require putting the code in a file, for example
filter.txt:

  my $event_ok; if (...) { $event_ok=1; } else { $event_ok=0; } $event_ok

Then specify C<--filter filter.txt> to read the code from filter.txt.

If the filter code won't compile, mk-query-digest will die with an error.
If the filter code does compile, an error may still occur at runtime if the
code tries to do something wrong (like pattern match an undefined value).
mk-query-digest does not provide any safeguards so code carefully!

An example filter that discards everything but SELECT statements:

  --filter '$event->{arg} =~ m/^select/i'

This is compiled into a subroutine like the following:

  sub { $event = shift; ( $event->{arg} =~ m/^select/i ) && return $event; }

It is permissible for the code to have side effects (to alter C<$event>).

You can find an explanation of the structure of $event at
L<http://code.google.com/p/maatkit/wiki/EventAttributes>.

Here are more examples of filter code:

=over

=item Host/IP matches domain.com

--filter '($event->{host} || $event->{ip} || "") =~ m/domain.com/'

Sometimes MySQL logs the host where the IP is expected.  Therefore, we
check both.

=item User matches john

--filter '($event->{user} || "") =~ m/john/'

=item More than 1 warning

--filter '($event->{Warning_count} || 0) > 1'

=item Query does full table scan or full join

--filter '(($event->{Full_scan} || "") eq "Yes") || (($event->{Full_join} || "") eq "Yes")'

=item Query was not served from query cache

--filter '($event->{QC_Hit} || "") eq "No"'

=item Query is 1 MB or larger

--filter '$event->{bytes} >= 1_048_576'

=back

Since L<"--filter"> allows you to alter C<$event>, you can use it to do other
things, like create new attributes.  See L<"ATTRIBUTES"> for an example.

=item --fingerprints

Add query fingerprints to the standard query analysis report.  This is mostly
useful for debugging purposes.

=item --[no]for-explain

default: yes

Print extra information to make analysis easy.

This option adds code snippets to make it easy to run SHOW CREATE TABLE and SHOW
TABLE STATUS for the query's tables.  It also rewrites non-SELECT queries into a
SELECT that might be helpful for determining the non-SELECT statement's index
usage.

=item --group-by

type: Array; default: fingerprint

Which attribute of the events to group by.

In general, you can group queries into classes based on any attribute of the
query, such as C<user> or C<db>, which will by default show you which users
and which databases get the most C<Query_time>.  The default attribute,
C<fingerprint>, groups similar, abstracted queries into classes; see below
and see also L<"FINGERPRINTS">.

A report is printed for each L<"--group-by"> value (unless C<--no-report> is
given).  Therefore, C<--group-by user,db> means "report on queries with the
same user and report on queries with the same db"--it does not mean "report
on queries with the same user and db."  See also L<"OUTPUT">.

Every value must have a corresponding value in the same position in
L<"--order-by">.  However, adding values to L<"--group-by"> will automatically
add values to L<"--order-by">, for your convenience.

There are several magical values that cause some extra data mining to happen
before the grouping takes place:

=over

=item fingerprint

This causes events to be fingerprinted to abstract queries into
a canonical form, which is then used to group events together into a class.
See L<"FINGERPRINTS"> for more about fingerprinting.

=item tables

This causes events to be inspected for what appear to be tables, and
then aggregated by that.  Note that a query that contains two or more tables
will be counted as many times as there are tables; so a join against two tables
will count the Query_time against both tables.

=item distill

This is a sort of super-fingerprint that collapses queries down
into a suggestion of what they do, such as C<INSERT SELECT table1 table2>.

=back

If parsing memcached input (L<"--type"> memcached), there are other
attributes which you can group by: key_print (see memcached section in
L<"FINGERPRINTS">), cmd, key, res and val (see memcached section in
L<"ATTRIBUTES">).

=item --[no]gzip

default: yes

Gzip L<"--save-results"> files; requires IO::Compress::Gzip.

=item --help

Show help and exit.

=item --host

short form: -h; type: string

Connect to host.

=item --ignore-attributes

type: array; default: arg, cmd, insert_id, ip, port, Thread_id, timestamp, exptime, flags, key, res, val, server_id, offset, end_log_pos, Xid

Do not aggregate these attributes when auto-detecting L<"--select">.

If you do not specify L<"--select"> then mk-query-digest auto-detects and
aggregates every attribute that it finds in the slow log.  Some attributes,
however, should not be aggregated.  This option allows you to specify a list
of attributes to ignore.  This only works when no explicit L<"--select"> is
given.

=item --inherit-attributes

type: array; default: db,ts

If missing, inherit these attributes from the last event that had them.

This option sets which attributes are inherited or carried forward to events
which do not have them.  For example, if one event has the db attribute equal
to "foo", but the next event doesn't have the db attribute, then it inherits
"foo" for its db attribute.

Inheritance is usually desirable, but in some cases it might confuse things.
If a query inherits a database that it doesn't actually use, then this could
confuse L<"--execute">.

=item --interval

type: float; default: .1

How frequently to poll the processlist, in seconds.

=item --iterations

type: int; default: 1

How many times to iterate through the collect-and-report cycle.  If 0, iterate
to infinity.  Each iteration runs for L<"--run-time"> amount of time.  An
iteration is usually determined by an amount of time and a report is printed
when that amount of time elapses.  With L<"--run-time-mode"> C<interval>,
an interval is instead determined by the interval time you specify with
L<"--run-time">.  See L<"--run-time"> and L<"--run-time-mode"> for more
information.

=item --limit

type: Array; default: 95%:20

Limit output to the given percentage or count.

If the argument is an integer, report only the top N worst queries.  If the
argument is an integer followed by the C<%> sign, report that percentage of the
worst queries.  If the percentage is followed by a colon and another integer,
report the top percentage or the number specified by that integer, whichever
comes first.

The value is actually a comma-separated array of values, one for each item in
L<"--group-by">.  If you don't specify a value for any of those items, the
default is the top 95%.

See also L<"--outliers">.

=item --log

type: string

Print all output to this file when daemonized.

=item --mirror

type: float

How often to check whether connections should be moved, depending on
C<read_only>.  Requires L<"--processlist"> and L<"--execute">.

This option causes mk-query-digest to check every N seconds whether it is reading
from a read-write server and executing against a read-only server, which is a
sensible way to set up two servers if you're doing something like master-master
replication.  The L<http://code.google.com/p/mysql-master-master/> master-master
toolkit does this. The aim is to keep the passive server ready for failover,
which is impossible without putting it under a realistic workload.

=item --order-by

type: Array; default: Query_time:sum

Sort events by this attribute and aggregate function.

This is a comma-separated list of order-by expressions, one for each
L<"--group-by"> attribute.  The default C<Query_time:sum> is used for
L<"--group-by"> attributes without explicitly given L<"--order-by"> attributes
(that is, if you specify more L<"--group-by"> attributes than corresponding
L<"--order-by"> attributes).  The syntax is C<attribute:aggregate>.  See
L<"ATTRIBUTES"> for valid attributes.  Valid aggregates are:

   Aggregate Meaning
   ========= ============================
   sum       Sum/total attribute value
   min       Minimum attribute value
   max       Maximum attribute value
   cnt       Frequency/count of the query

For example, the default C<Query_time:sum> means that queries in the
query analysis report will be ordered (sorted) by their total query execution
time ("Exec time").  C<Query_time:max> orders the queries by their
maximum query execution time, so the query with the single largest
C<Query_time> will be list first.  C<cnt> refers more to the frequency
of the query as a whole, how often it appears; "Count" is its corresponding
line in the query analysis report.  So any attribute and C<cnt> should yield
the same report wherein queries are sorted by the number of times they
appear.

When parsing general logs (L<"--type"> C<genlog>), the default L<"--order-by">
becomes C<Query_time:cnt>.  General logs do not report query times so only
the C<cnt> aggregate makes sense because all query times are zero.

If you specify an attribute that doesn't exist in the events, then
mk-query-digest falls back to the default C<Query_time:sum> and prints a notice
at the beginning of the report for each query class.  You can create attributes
with L<"--filter"> and order by them; see L<"ATTRIBUTES"> for an example.

=item --outliers

type: array; default: Query_time:1:10

Report outliers by attribute:percentile:count.

The syntax of this option is a comma-separated list of colon-delimited strings.
The first field is the attribute by which an outlier is defined.  The second is
a number that is compared to the attribute's 95th percentile.  The third is
optional, and is compared to the attribute's cnt aggregate.  Queries that pass
this specification are added to the report, regardless of any limits you
specified in L<"--limit">.

For example, to report queries whose 95th percentile Query_time is at least 60
seconds and which are seen at least 5 times, use the following argument:

  --outliers Query_time:60:5

You can specify an --outliers option for each value in L<"--group-by">.

=item --password

short form: -p; type: string

Password to use when connecting.

=item --pid

type: string

Create the given PID file when daemonized.  The file contains the process
ID of the daemonized instance.  The PID file is removed when the
daemonized instance exits.  The program checks for the existence of the
PID file when starting; if it exists and the process with the matching PID
exists, the program exits.

=item --pipeline-profile

Print a profile of the pipeline processes.

=item --port

short form: -P; type: int

Port number to use for connection.

=item --print

Print log events to STDOUT in standard slow-query-log format.

=item --print-iterations

Print the start time for each L<"--iterations">.

This option causes a line like the following to be printed at the start
of each L<"--iterations"> report:

  # Iteration 2 started at 2009-11-24T14:39:48.345780 

This line will print even if C<--no-report> is specified.  If C<--iterations 0>
is specified, each iteration number will be C<0>.

=item --processlist

type: DSN

Poll this DSN's processlist for queries, with L<"--interval"> sleep between.

If the connection fails, mk-query-digest tries to reopen it once per second. See
also L<"--mirror">.

=item --progress

type: array; default: time,30

Print progress reports to STDERR.  The value is a comma-separated list with two
parts.  The first part can be percentage, time, or iterations; the second part
specifies how often an update should be printed, in percentage, seconds, or
number of iterations.

=item --read-timeout

type: time; default: 0

Wait this long for an event from the input; 0 to wait forever.

This option sets the maximum time to wait for an event from the input.  It
applies to all types of input except L<"--processlist">.  If an
event is not received after the specified time, the script stops reading the
input and prints its reports.  If L<"--iterations"> is 0 or greater than
1, the next iteration will begin, else the script will exit.

This option requires the Perl POSIX module.

=item --[no]report

default: yes

Print out reports on the aggregate results from L<"--group-by">.

This is the standard slow-log analysis functionality.  See L<"OUTPUT"> for the
description of what this does and what the results look like.

=item --report-all

Include all queries, even if they have already been reviewed.

=item --report-format

type: Array; default: rusage,date,hostname,files,header,profile,query_report,prepared

Print these sections of the query analysis report.

  SECTION      PRINTS
  ============ ======================================================
  rusage       CPU times and memory usage reported by ps
  date         Current local date and time
  hostname     Hostname of machine on which mk-query-digest was run
  files        Input files read/parse
  header       Summary of the entire analysis run
  profile      Compact table of queries for an overview of the report
  query_report Detailed information about each unique query
  prepared     Prepared statements

The sections are printed in the order specified.  The rusage, date, files and
header sections are grouped together if specified together; other sections are
separated by blank lines.

See L<"OUTPUT"> for more information on the various parts of the query report.

=item --report-histogram

type: string; default: Query_time

Chart the distribution of this attribute's values.

The distribution chart is limited to time-based attributes, so charting
C<Rows_examined>, for example, will produce a useless chart.  Charts look
like:

  # Query_time distribution
  #   1us
  #  10us
  # 100us
  #   1ms
  #  10ms  ################################
  # 100ms  ################################################################
  #    1s  ########
  #  10s+

A sparkline (see L<"SPARKLINES">) of the full chart is also printed in the
header for each query event.  The sparkline of that full chart is:

  # Query_time sparkline: |    .^_ |

The sparkline itself is the 8 characters between the pipes (C<|>), one character
for each of the 8 buckets (1us, 10us, etc.)  Four character codes are used
to represent the approximate relation between each bucket's value:

  _ . - ^

The caret C<^> represents peaks (buckets with the most values), and
the underscore C<_> represents lows (buckets with the least or at least
one value).  The period C<.> and the hyphen C<-> represent buckets with values
between these two extremes.  If a bucket has no values, a space is printed.
So in the example above, the period represents the 10ms bucket, the caret
the 100ms bucket, and the underscore the 1s bucket.

See L<"OUTPUT"> for more information.

=item --review

type: DSN

Store a sample of each class of query in this DSN.

The argument specifies a table to store all unique query fingerprints in.  The
table must have at least the following columns.  You can add more columns for
your own special purposes, but they won't be used by mk-query-digest.  The
following CREATE TABLE definition is also used for L<"--create-review-table">.
MAGIC_create_review:

  CREATE TABLE query_review (
     checksum     BIGINT UNSIGNED NOT NULL PRIMARY KEY,
     fingerprint  TEXT NOT NULL,
     sample       TEXT NOT NULL,
     first_seen   DATETIME,
     last_seen    DATETIME,
     reviewed_by  VARCHAR(20),
     reviewed_on  DATETIME,
     comments     TEXT
  )

The columns are as follows:

  COLUMN       MEANING
  ===========  ===============
  checksum     A 64-bit checksum of the query fingerprint
  fingerprint  The abstracted version of the query; its primary key
  sample       The query text of a sample of the class of queries
  first_seen   The smallest timestamp of this class of queries
  last_seen    The largest timestamp of this class of queries
  reviewed_by  Initially NULL; if set, query is skipped thereafter
  reviewed_on  Initially NULL; not assigned any special meaning
  comments     Initially NULL; not assigned any special meaning

Note that the C<fingerprint> column is the true primary key for a class of
queries.  The C<checksum> is just a cryptographic hash of this value, which
provides a shorter value that is very likely to also be unique.

After parsing and aggregating events, your table should contain a row for each
fingerprint.  This option depends on C<--group-by fingerprint> (which is the
default).  It will not work otherwise.

=item --review-history

type: DSN

The table in which to store historical values for review trend analysis.

Each time you review queries with L<"--review">, mk-query-digest will save
information into this table so you can see how classes of queries have changed
over time.

This DSN inherits unspecified values from L<"--review">.  It should mention a
table in which to store statistics about each class of queries.  mk-query-digest
verifies the existence of the table, and your privileges to insert, delete and
update on that table.

mk-query-digest then inspects the columns in the table.  The table must have at
least the following columns:

  CREATE TABLE query_review_history (
    checksum     BIGINT UNSIGNED NOT NULL,
    sample       TEXT NOT NULL
  );

Any columns not mentioned above are inspected to see if they follow a certain
naming convention.  The column is special if the name ends with an underscore
followed by any of these MAGIC_history_cols values:

  pct|avt|cnt|sum|min|max|pct_95|stddev|median|rank

If the column ends with one of those values, then the prefix is interpreted as
the event attribute to store in that column, and the suffix is interpreted as
the metric to be stored.  For example, a column named Query_time_min will be
used to store the minimum Query_time for the class of events.  The presence of
this column will also add Query_time to the L<"--select"> list.

The table should also have a primary key, but that is up to you, depending on
how you want to store the historical data.  We suggest adding ts_min and ts_max
columns and making them part of the primary key along with the checksum.  But
you could also just add a ts_min column and make it a DATE type, so you'd get
one row per class of queries per day.

The default table structure follows.  The following MAGIC_create_review_history
table definition is used for L<"--create-review-history-table">:

 CREATE TABLE query_review_history (
   checksum             BIGINT UNSIGNED NOT NULL,
   sample               TEXT NOT NULL,
   ts_min               DATETIME,
   ts_max               DATETIME,
   ts_cnt               FLOAT,
   Query_time_sum       FLOAT,
   Query_time_min       FLOAT,
   Query_time_max       FLOAT,
   Query_time_pct_95    FLOAT,
   Query_time_stddev    FLOAT,
   Query_time_median    FLOAT,
   Lock_time_sum        FLOAT,
   Lock_time_min        FLOAT,
   Lock_time_max        FLOAT,
   Lock_time_pct_95     FLOAT,
   Lock_time_stddev     FLOAT,
   Lock_time_median     FLOAT,
   Rows_sent_sum        FLOAT,
   Rows_sent_min        FLOAT,
   Rows_sent_max        FLOAT,
   Rows_sent_pct_95     FLOAT,
   Rows_sent_stddev     FLOAT,
   Rows_sent_median     FLOAT,
   Rows_examined_sum    FLOAT,
   Rows_examined_min    FLOAT,
   Rows_examined_max    FLOAT,
   Rows_examined_pct_95 FLOAT,
   Rows_examined_stddev FLOAT,
   Rows_examined_median FLOAT,
   -- Percona extended slowlog attributes 
   -- http://www.percona.com/docs/wiki/patches:slow_extended
   Rows_affected_sum             FLOAT,
   Rows_affected_min             FLOAT,
   Rows_affected_max             FLOAT,
   Rows_affected_pct_95          FLOAT,
   Rows_affected_stddev          FLOAT,
   Rows_affected_median          FLOAT,
   Rows_read_sum                 FLOAT,
   Rows_read_min                 FLOAT,
   Rows_read_max                 FLOAT,
   Rows_read_pct_95              FLOAT,
   Rows_read_stddev              FLOAT,
   Rows_read_median              FLOAT,
   Merge_passes_sum              FLOAT,
   Merge_passes_min              FLOAT,
   Merge_passes_max              FLOAT,
   Merge_passes_pct_95           FLOAT,
   Merge_passes_stddev           FLOAT,
   Merge_passes_median           FLOAT,
   InnoDB_IO_r_ops_min           FLOAT,
   InnoDB_IO_r_ops_max           FLOAT,
   InnoDB_IO_r_ops_pct_95        FLOAT,
   InnoDB_IO_r_ops_stddev        FLOAT,
   InnoDB_IO_r_ops_median        FLOAT,
   InnoDB_IO_r_bytes_min         FLOAT,
   InnoDB_IO_r_bytes_max         FLOAT,
   InnoDB_IO_r_bytes_pct_95      FLOAT,
   InnoDB_IO_r_bytes_stddev      FLOAT,
   InnoDB_IO_r_bytes_median      FLOAT,
   InnoDB_IO_r_wait_min          FLOAT,
   InnoDB_IO_r_wait_max          FLOAT,
   InnoDB_IO_r_wait_pct_95       FLOAT,
   InnoDB_IO_r_wait_stddev       FLOAT,
   InnoDB_IO_r_wait_median       FLOAT,
   InnoDB_rec_lock_wait_min      FLOAT,
   InnoDB_rec_lock_wait_max      FLOAT,
   InnoDB_rec_lock_wait_pct_95   FLOAT,
   InnoDB_rec_lock_wait_stddev   FLOAT,
   InnoDB_rec_lock_wait_median   FLOAT,
   InnoDB_queue_wait_min         FLOAT,
   InnoDB_queue_wait_max         FLOAT,
   InnoDB_queue_wait_pct_95      FLOAT,
   InnoDB_queue_wait_stddev      FLOAT,
   InnoDB_queue_wait_median      FLOAT,
   InnoDB_pages_distinct_min     FLOAT,
   InnoDB_pages_distinct_max     FLOAT,
   InnoDB_pages_distinct_pct_95  FLOAT,
   InnoDB_pages_distinct_stddev  FLOAT,
   InnoDB_pages_distinct_median  FLOAT,
   -- Boolean (Yes/No) attributes.  Only the cnt and sum are needed for these.
   -- cnt is how many times is attribute was recorded and sum is how many of
   -- those times the value was Yes.  Therefore sum/cnt * 100 = % of recorded
   -- times that the value was Yes.
   QC_Hit_cnt          FLOAT,
   QC_Hit_sum          FLOAT,
   Full_scan_cnt       FLOAT,
   Full_scan_sum       FLOAT,
   Full_join_cnt       FLOAT,
   Full_join_sum       FLOAT,
   Tmp_table_cnt       FLOAT,
   Tmp_table_sum       FLOAT,
   Disk_tmp_table_cnt  FLOAT,
   Disk_tmp_table_sum  FLOAT,
   Filesort_cnt        FLOAT,
   Filesort_sum        FLOAT,
   Disk_filesort_cnt   FLOAT,
   Disk_filesort_sum   FLOAT,
   PRIMARY KEY(checksum, ts_min, ts_max)
 );

Note that we store the count (cnt) for the ts attribute only; it will be
redundant to store this for other attributes.

=item --run-time

type: time

How long to run for each L<"--iterations">.  The default is to run forever
(you can interrupt with CTRL-C).  Because L<"--iterations"> defaults to 1,
if you only specify L<"--run-time">, mk-query-digest runs for that amount of
time and then exits.  The two options are specified together to do
collect-and-report cycles.  For example, specifying L<"--iterations"> C<4>
L<"--run-time"> C<15m> with a continuous input (like STDIN or
L<"--processlist">) will cause mk-query-digest to run for 1 hour
(15 minutes x 4), reporting four times, once at each 15 minute interval.

=item --run-time-mode

type: string; default: clock

Set what the value of L<"--run-time"> operates on.  Following are the possible
values for this option:

=over

=item clock

L<"--run-time"> specifies an amount of real clock time during which the tool
should run for each L<"--iterations">.

=item event

L<"--run-time"> specifies an amount of log time.  Log time is determined by
timestamps in the log.  The first timestamp seen is remembered, and each
timestamp after that is compared to the first to determine how much log time
has passed.  For example, if the first timestamp seen is C<12:00:00> and the
next is C<12:01:30>, that is 1 minute and 30 seconds of log time.  The tool
will read events until the log time is greater than or equal to the specified
L<"--run-time"> value.

Since timestamps in logs are not always printed, or not always printed
frequently, this mode varies in accuracy.

=item interval

L<"--run-time"> specifies interval boundaries of log time into which events
are divided and reports are generated.  This mode is different from the
others because it doesn't specify how long to run.  The value of
L<"--run-time"> must be an interval that divides evenly into minutes, hours
or days.  For example, C<5m> divides evenly into hours (60/5=12, so 12
5 minutes intervals per hour) but C<7m> does not (60/7=8.6).

Specifying C<--run-time-mode interval --run-time 30m --iterations 0> is
similar to specifying C<--run-time-mode clock --run-time 30m --iterations 0>.
In the latter case, mk-query-digest will run forever, producing reports every
30 minutes, but this only works effectively with  continuous inputs like
STDIN and the processlist.  For fixed inputs, like log files, the former
example produces multiple reports by dividing the log into 30 minutes
intervals based on timestamps.

Intervals are calculated from the zeroth second/minute/hour in which a
timestamp occurs, not from whatever time it specifies.  For example,
with 30 minute intervals and a timestamp of C<12:10:30>, the interval
is I<not> C<12:10:30> to C<12:40:30>, it is C<12:00:00> to C<12:29:59>.
Or, with 1 hour intervals, it is C<12:00:00> to C<12:59:59>.
When a new timestamp exceeds the interval, a report is printed, and the
next interval is recalculated based on the new timestamp.

Since L<"--iterations"> is 1 by default, you probably want to specify
a new value else mk-query-digest will only get and report on the first
interval from the log since 1 interval = 1 iteration.  If you want to
get and report every interval in a log, specify L<"--iterations"> C<0>.

=back

=item --sample

type: int

Filter out all but the first N occurrences of each query.  The queries are
filtered on the first value in L<"--group-by">, so by default, this will filter
by query fingerprint.  For example, C<--sample 2> will permit two sample queries
for each fingerprint.  Useful in conjunction with L<"--print"> to print out the
queries.  You probably want to set C<--no-report> to avoid the overhead of
aggregating and reporting if you're just using this to print out samples of
queries.  A complete example:

  mk-query-digest --sample 2 --no-report --print slow.log

=item --save-results

type: string

Save results to the specified file.

If L<"--[no]gzip"> is true (by default it is) then .gz is appended to the
file name.

=item --select

type: Array

Compute aggregate statistics for these attributes.

By default mk-query-digest auto-detects, aggregates and prints metrics for
every query attribute that it finds in the slow query log.  This option
specifies a list of only the attributes that you want.  You can specify an
alternative attribute with a colon.  For example, C<db:Schema> uses db if it's
available, and Schema if it's not.

Previously, mk-query-digest only aggregated these attributes:

  Query_time,Lock_time,Rows_sent,Rows_examined,user,db:Schema,ts

Attributes specified in the L<"--review-history"> table will always be selected 
even if you do not specify L<"--select">.

See also L<"--ignore-attributes"> and L<"ATTRIBUTES">.

=item --set-vars

type: string; default: wait_timeout=10000

Set these MySQL variables.  Immediately after connecting to MySQL, this
string will be appended to SET and executed.

=item --shorten

type: int; default: 1024

Shorten long statements in reports.

Shortens long statements, replacing the omitted portion with a C</*... omitted
...*/> comment.  This applies only to the output in reports, not to information
stored for L<"--review"> or other places.  It prevents a large statement from
causing difficulty in a report.  The argument is the preferred length of the
shortened statement.  Not all statements can be shortened, but very large INSERT
and similar statements often can; and so can IN() lists, although only the first
such list in the statement will be shortened.

If it shortens something beyond recognition, you can find the original statement
in the log, at the offset shown in the report header (see L<"OUTPUT">).

=item --show-all

type: Hash

Show all values for these attributes.

By default mk-query-digest only shows as many of an attribute's value that
fit on a single line.  This option allows you to specify attributes for which
all values will be shown (line width is ignored).  This only works for
attributes with string values like user, host, db, etc.  Multiple attributes
can be specified, comma-separated.

=item --since

type: string

Parse only queries newer than this value (parse queries since this date).

This option allows you to ignore queries older than a certain value and parse
only those queries which are more recent than the value.  The value can be
several types:

  * Simple time value N with optional suffix: N[shmd], where
    s=seconds, h=hours, m=minutes, d=days (default s if no suffix
    given); this is like saying "since N[shmd] ago"
  * Full date with optional hours:minutes:seconds:
    YYYY-MM-DD [HH:MM::SS]
  * Short, MySQL-style date:
    YYMMDD [HH:MM:SS]
  * Any time expression evaluated by MySQL:
    CURRENT_DATE - INTERVAL 7 DAY

If you give a MySQL time expression, then you must also specify a DSN
so that mk-query-digest can connect to MySQL to evaluate the expression.  If you
specify L<"--execute">, L<"--explain">, L<"--processlist">, L<"--review">
or L<"--review-history">, then one of these DSNs will be used automatically.
Otherwise, you must specify an L<"--aux-dsn"> or mk-query-digest will die
saying that the value is invalid.

The MySQL time expression is wrapped inside a query like
"SELECT UNIX_TIMESTAMP(<expression>)", so be sure that the expression is
valid inside this query.  For example, do not use UNIX_TIMESTAMP() because
UNIX_TIMESTAMP(UNIX_TIMESTAMP()) returns 0.

Events are assumed to be in chronological--older events at the beginning of
the log and newer events at the end of the log.  L<"--since"> is strict: it
ignores all queries until one is found that is new enough.  Therefore, if
the query events are not consistently timestamped, some may be ignored which
are actually new enough.

See also L<"--until">.

=item --socket

short form: -S; type: string

Socket file to use for connection.

=item --statistics

Print statistics about internal counters.  This option is mostly for
development and debugging.  The statistics report is printed for each
iteration after all other reports, even if no events are processed or
C<--no-report> is specified.  The statistics report looks like:

   # No events processed.

   # Statistic                                        Count  %/Events
   # ================================================ ====== ========
   # events_read                                      142030   100.00
   # events_parsed                                     50430    35.51
   # events_aggregated                                     0     0.00
   # ignored_midstream_server_response                 18111    12.75
   # no_tcp_data                                       91600    64.49
   # pipeline_restarted_after_MemcachedProtocolParser 142030   100.00
   # pipeline_restarted_after_TcpdumpParser                1     0.00
   # unknown_client_command                                1     0.00
   # unknown_client_data                               32318    22.75

The first column is the internal counter name; the second column is counter's
count; and the third column is the count as a percentage of C<events_read>.

In this case, it shows why no events were processed/aggregated: 100% of events
were rejected by the C<MemcachedProtocolParser>.  Of those, 35.51% were data
packets, but of these 12.75% of ignored mid-stream server response, one was
an unknown client command, and 22.75% were unknown client data.  The other
64.49% were TCP control packets (probably most ACKs).

Since mk-query-digest is complex, you will probably need someone familiar
with its code to decipher the statistics report.

=item --table-access

Print a table access report.

The table access report shows which tables are accessed by all the queries
and if the access is a read or write.  The report looks like:

  write `baz`.`tbl`
  read `baz`.`new_tbl`
  write `baz`.`tbl3`
  write `db6`.`tbl6`

If you pipe the output to L<sort>, the read and write tables will be grouped
together and sorted alphabetically:

  read `baz`.`new_tbl`
  write `baz`.`tbl`
  write `baz`.`tbl3`
  write `db6`.`tbl6`

=item --tcpdump-errors

type: string

Write the tcpdump data to this file on error.  If mk-query-digest doesn't
parse the stream correctly for some reason, the session's packets since the
last query event will be written out to create a usable test case.  If this
happens, mk-query-digest will not raise an error; it will just discard the
session's saved state and permit the tool to continue working.  See L<"tcpdump">
for more information about parsing tcpdump output.

=item --timeline

Show a timeline of events.

This option makes mk-query-digest print another kind of report: a timeline of
the events.  Each query is still grouped and aggregate into classes according to
L<"--group-by">, but then they are printed in chronological order.  The timeline
report prints out the timestamp, interval, count and value of each classes.

If all you want is the timeline report, then specify C<--no-report> to
suppress the default query analysis report.  Otherwise, the timeline report
will be printed at the end before the response-time profile
(see L<"--report-format"> and L<"OUTPUT">).

For example, this:

  mk-query-digest /path/to/log --group-by distill --timeline

will print something like:

  # ########################################################
  # distill report
  # ########################################################
  # 2009-07-25 11:19:27 1+00:00:01   2 SELECT foo
  # 2009-07-27 11:19:30      00:01   2 SELECT bar
  # 2009-07-27 11:30:00 1+06:30:00   2 SELECT foo

=item --type

type: Array

The type of input to parse (default slowlog).  The permitted types are

=over

=item binlog

Parse a binary log file.

=item genlog

Parse a MySQL general log file.  General logs lack a lot of L<"ATTRIBUTES">,
notably C<Query_time>.  The default L<"--order-by"> for general logs
changes to C<Query_time:cnt>.

=item http

Parse HTTP traffic from tcpdump.

=item pglog

Parse a log file in PostgreSQL format.  The parser will automatically recognize
logs sent to syslog and transparently parse the syslog format, too.  The
recommended configuration for logging in your postgresql.conf is as follows.

The log_destination setting can be set to either syslog or stderr.  Syslog has
the added benefit of not interleaving log messages from several sessions
concurrently, which the parser cannot handle, so this might be better than
stderr.  CSV-formatted logs are not supported at this time.

The log_min_duration_statement setting should be set to 0 to capture all
statements with their durations.  Alternatively, the parser will also recognize
and handle various combinations of log_duration and log_statement.

You may enable log_connections and log_disconnections, but this is optional.

It is highly recommended to set your log_line_prefix to the following:

  log_line_prefix = '%m c=%c,u=%u,D=%d '

This lets the parser find timestamps with milliseconds, session IDs, users, and
databases from the log.  If these items are missing, you'll simply get less
information to analyze.  For compatibility with other log analysis tools such as
PQA and pgfouine, various log line prefix formats are supported.  The general
format is as follows: a timestamp can be detected and extracted (the syslog
timestamp is NOT parsed), and a name=value list of properties can also.
Although the suggested format is as shown above, any name=value list will be
captured and interpreted by using the first letter of the 'name' part,
lowercased, to determine the meaning of the item.  The lowercased first letter
is interpreted to mean the same thing as PostgreSQL's built-in %-codes for the
log_line_prefix format string.  For example, u means user, so unicorn=fred
will be interpreted as user=fred; d means database, so D=john will be
interpreted as database=john.  The pgfouine-suggested formatting is user=%u and
db=%d, so it should Just Work regardless of which format you choose.  The main
thing is to add as much information as possible into the log_line_prefix to
permit richer analysis.

Currently, only English locale messages are supported, so if your server's
locale is set to something else, the log won't be parsed properly.  (Log
messages with "duration:" and "statement:" won't be recognized.)

=item slowlog

Parse a log file in any variation of MySQL slow-log format.

=item tcpdump

Inspect network packets and decode the MySQL client protocol, extracting queries
and responses from it.

mk-query-digest does not actually watch the network (i.e. it does NOT "sniff
packets").  Instead, it's just parsing the output of tcpdump.  You are
responsible for generating this output; mk-query-digest does not do it for you.
Then you send this to mk-query-digest as you would any log file: as files on the
command line or to STDIN.

The parser expects the input to be formatted with the following options: C<-x -n
-q -tttt>.  For example, if you want to capture output from your local machine,
you can do something like the following (the port must come last on FreeBSD):

  tcpdump -s 65535 -x -nn -q -tttt -i any -c 1000 port 3306 \
    > mysql.tcp.txt
  mk-query-digest --type tcpdump mysql.tcp.txt

The other tcpdump parameters, such as -s, -c, and -i, are up to you.  Just make
sure the output looks like this (there is a line break in the first line to
avoid man-page problems):

  2009-04-12 09:50:16.804849 IP 127.0.0.1.42167
         > 127.0.0.1.3306: tcp 37
      0x0000:  4508 0059 6eb2 4000 4006 cde2 7f00 0001
      0x0010:  ....

Remember tcpdump has a handy -c option to stop after it captures some number of
packets!  That's very useful for testing your tcpdump command.  Note that
tcpdump can't capture traffic on a Unix socket.  Read
L<http://bugs.mysql.com/bug.php?id=31577> if you're confused about this.

Devananda Van Der Veen explained on the MySQL Performance Blog how to capture
traffic without dropping packets on busy servers.  Dropped packets cause
mk-query-digest to miss the response to a request, then see the response to a
later request and assign the wrong execution time to the query.  You can change
the filter to something like the following to help capture a subset of the
queries.  (See L<http://www.mysqlperformanceblog.com/?p=6092> for details.)

  tcpdump -i any -s 65535 -x -n -q -tttt \
     'port 3306 and tcp[1] & 7 == 2 and tcp[3] & 7 == 2'

All MySQL servers running on port 3306 are automatically detected in the
tcpdump output.  Therefore, if the tcpdump out contains packets from
multiple servers on port 3306 (for example, 10.0.0.1:3306, 10.0.0.2:3306,
etc.), all packets/queries from all these servers will be analyzed
together as if they were one server.

If you're analyzing traffic for a MySQL server that is not running on port
3306, see L<"--watch-server">.

Also note that mk-query-digest may fail to report the database for queries
when parsing tcpdump output.  The database is discovered only in the initial
connect events for a new client or when <USE db> is executed.  If the tcpdump
output contains neither of these, then mk-query-digest cannot discover the
database.

Server-side prepared statements are supported.  SSL-encrypted traffic cannot be
inspected and decoded.

=item memcached

Similar to tcpdump, but the expected input is memcached packets
instead of MySQL packets.  For example:

  tcpdump -i any port 11211 -s 65535 -x -nn -q -tttt \
    > memcached.tcp.txt
  mk-query-digest --type memcached memcached.tcp.txt

memcached uses port 11211 by default.

=back

=item --until

type: string

Parse only queries older than this value (parse queries until this date).

This option allows you to ignore queries newer than a certain value and parse
only those queries which are older than the value.  The value can be one of
the same types listed for L<"--since">.

Unlike L<"--since">, L<"--until"> is not strict: all queries are parsed until
one has a timestamp that is equal to or greater than L<"--until">.  Then
all subsequent queries are ignored.

=item --user

short form: -u; type: string

User for login if not current user.

=item --variations

type: Array

Report the number of variations in these attributes' values.

Variations show how many distinct values an attribute had within a class.
The usual value for this option is C<arg> which shows how many distinct queries
were in the class.  This can be useful to determine a query's cacheability.

Distinct values are determined by CRC32 checksums of the attributes' values.
These checksums are reported in the query report for attributes specified by
this option, like:

  # arg crc      109 (1/25%), 144 (1/25%)... 2 more

In that class there were 4 distinct queries.  The checksums of the first two
variations are shown, and each one occurred once (or, 25% of the time).

The counts of distinct variations is approximate because only 1,000 variations
are saved.  The mod (%) 1000 of the full CRC32 checksum is saved, so some
distinct checksums are treated as equal.

=item --version

Show version and exit.

=item --watch-server

type: string

This option tells mk-query-digest which server IP address and port (like
"10.0.0.1:3306") to watch when parsing tcpdump (for L<"--type"> tcpdump and
memcached); all other servers are ignored.  If you don't specify it,
mk-query-digest watches all servers by looking for any IP address using port
3306 or "mysql".  If you're watching a server with a non-standard port, this
won't work, so you must specify the IP address and port to watch.

If you want to watch a mix of servers, some running on standard port 3306
and some running on non-standard ports, you need to create separate
tcpdump outputs for the non-standard port servers and then specify this
option for each.  At present mk-query-digest cannot auto-detect servers on
port 3306 and also be told to watch a server on a non-standard port.

=item --[no]zero-admin

default: yes

Zero out the Rows_XXX properties for administrator command events.

=item --[no]zero-bool

default: yes

Print 0% boolean values in report.

=back

=head1 DSN OPTIONS

These DSN options are used to create a DSN.  Each option is given like
C<option=value>.  The options are case-sensitive, so P and p are not the
same option.  There cannot be whitespace before or after the C<=> and
if the value contains whitespace it must be quoted.  DSN options are
comma-separated.  See the L<maatkit> manpage for full details.

=over

=item * A

dsn: charset; copy: yes

Default character set.

=item * D

dsn: database; copy: yes

Database that contains the query review table.

=item * F

dsn: mysql_read_default_file; copy: yes

Only read default options from the given file

=item * h

dsn: host; copy: yes

Connect to host.

=item * p

dsn: password; copy: yes

Password to use when connecting.

=item * P

dsn: port; copy: yes

Port number to use for connection.

=item * S

dsn: mysql_socket; copy: yes

Socket file to use for connection.

=item * t

Table to use as the query review table.

=item * u

dsn: user; copy: yes

User for login if not current user.

=back

=head1 DOWNLOADING

You can download Maatkit from Google Code at
L<http://code.google.com/p/maatkit/>, or you can get any of the tools
easily with a command like the following:

   wget http://www.maatkit.org/get/toolname
   or
   wget http://www.maatkit.org/trunk/toolname

Where C<toolname> can be replaced with the name (or fragment of a name) of any
of the Maatkit tools.  Once downloaded, they're ready to run; no installation is
needed.  The first URL gets the latest released version of the tool, and the
second gets the latest trunk code from Subversion.

=head1 ENVIRONMENT

The environment variable C<MKDEBUG> enables verbose debugging output in all of
the Maatkit tools:

   MKDEBUG=1 mk-....

=head1 SYSTEM REQUIREMENTS

You need Perl and some core packages that ought to be installed in any
reasonably new version of Perl.

=head1 BUGS

For a list of known bugs see L<http://www.maatkit.org/bugs/mk-query-digest>.

Please use Google Code Issues and Groups to report bugs or request support:
L<http://code.google.com/p/maatkit/>.  You can also join #maatkit on Freenode to
discuss Maatkit.

Please include the complete command-line used to reproduce the problem you are
seeing, the version of all MySQL servers involved, the complete output of the
tool when run with L<"--version">, and if possible, debugging output produced by
running with the C<MKDEBUG=1> environment variable.

=head1 COPYRIGHT, LICENSE AND WARRANTY

This program is copyright 2007-2011 Baron Schwartz.
Feedback and improvements are welcome.

THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, version 2; OR the Perl Artistic License.  On UNIX and similar
systems, you can issue `man perlgpl' or `man perlartistic' to read these
licenses.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA  02111-1307  USA.

=head1 AUTHOR

Baron Schwartz, Daniel Nichter

=head1 ABOUT MAATKIT

This tool is part of Maatkit, a toolkit for power users of MySQL.  Maatkit
was created by Baron Schwartz; Baron and Daniel Nichter are the primary
code contributors.  Both are employed by Percona.  Financial support for
Maatkit development is primarily provided by Percona and its clients. 

=head1 VERSION

This manual page documents Ver 0.9.29 Distrib 7540 $Revision: 7531 $.

=cut