/usr/share/perl5/MR/Tarantool/Box/Singleton.pm is in libmr-tarantool-perl 0.0.24-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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=pod
=head1 NAME
MR::Tarantool::Box::Singleton - A singleton wrapper for L<MR::Tarantool::Box>.
Provides connection-persistence and replica fallback.
Please read L<"MR::Tarantool::Box manual"|MR::Tarantool::Box> first.
=head1 SYNOPSIS
package Some::Tarantool::Box::Singleton;
use MR::Tarantool::Box::Singleton;
use base 'MR::Tarantool::Box::Singleton';
BEGIN { # generates "TUPLE_$field_name" constants, and methods: FIELDS, FIELDS_HASH
__PACKAGE__->mkfields(qw/ id f1 f2 f3 field4 f5 f6 f7 misc_string /); # applicable for DEFAULT_SPACE only
}
sub SERVER { Some::Config->GetBoxServer() }
sub REPLICAS { Some::Config->GetBoxReplicas() }
sub DEFAULT_SPACE { 0 }
sub SPACES {[{
space => 0,
indexes => [ {
index_name => 'primary_id',
keys => [TUPLE_id],
}, {
index_name => 'secondary_f1f2',
keys => [TUPLE_f1, TUPLE_f2],
}, ],
format => 'QqLlSsCc&',
default_index => 'primary_id',
}, {
space => 1,
indexes => [ {
index_name => 'primary_id',
keys => [0],
}, ],
format => '&&&&',
fields => [qw/ string1 str2 s3 s4 /],
}]}
=head1 DESCRIPTION
=head2 METHODS
=cut
use strict;
use warnings;
use MR::Tarantool::Box;
use Class::Singleton;
use Carp qw/confess cluck/;
use List::Util qw/shuffle/;
use base qw/Class::Singleton/;
=pod
=head3 mkfields
BEGIN {
$CLASS->mkfields(@names);
}
=over
=item *
Generates constants "TUPLE_$fieldname" => $fieldposition in C<$CLASS>.
Just Like if you say C<< use constant TUPLE_id => 0, TUPLE_f1 => 1, ...; >>
=item *
Generates C<$CLASS> variable C<< @fields >> containing field names,
and a C<$CLASS> method C<FIELDS> returning C<< @fields >>.
=item *
Generates C<$CLASS> variable C<< %fields >> containing field names mapping to positions,
and a C<$CLASS> method C<FIELDS_HASH> returning C<< \%fields >>.
=item *
These C<< @fields >> are applied to the C<< DEFAULT_SPACE >>,
if I<< fields >> were not set explicitly for that space.
=back
=cut
sub _mkfields {
my($class, $f, $F, @fields) = @_;
no strict 'refs';
confess "$f are already defined for $class" if @{"${class}::${f}"};
@{"${class}::${f}"} = @fields;
%{"${class}::${f}"} = map { $fields[$_] => $_ } 0..$#fields;
eval qq{ sub ${class}::${F}TUPLE_$fields[$_] () { $_ } } for 0..$#fields;
eval qq{ sub ${class}::${F}FIELDS () { \@${class}::${f} } };
eval qq{ sub ${class}::${F}FIELDS_HASH () { \\\%${class}::${f} } };
}
sub mkfields { $_[0]->_mkfields('fields', '', @_[1..$#_]) }
sub mklongfields { $_[0]->_mkfields('long_fields', 'LONG_', @_[1..$#_]) }
=pod
=head3 declare_stored_procedure
$CLASS->declare_stored_procedure(%args);
$CLASS->declare_stored_procedure(
name => "box.do.something", # internal procedure name, in da box
method_name => "CallMyTestingStoredProcedure", # will generate method named
options => { default => options }, # MR::Tarantool::Box->Call \%options
params => [ qw{ P1 P2 P3 Param4 }], # names
unpack_format => "&LSC(L$)*",
params_format => [qw{ C S L a* }],
params_default => [ 1, 2, undef, 'the_default' ], # undef's are mandatory params
);
...
my $data = $CLASS->CallMyTestingStoredProcedure(
P1 => $val1,
P2 => $val2,
P3 => $val3,
Param4 => $val3,
{ option => $value }, # optional
) or warn $CLASS->ErrorStr;
Declare a stored procedure. This generates C<$CLASS> method C<< $args{method_name} >> which
calls Tarantool/Box procedure C<< $args{name} >>, using C<< $args{options} >> as default
C<< \%options >> for C<< MR::Tarantool::Box->Call >> call. The generated method has the following
prototype:
$CLASS->CallMyTestingStoredProcedure( %sp_params, \%optional_options );
Parameters description:
=over
=item B<%args>:
=over
=item B<name> => $tarantool_box_sp_name
The name of procedure in Tarantool/Box to call.
=item B<method_name> => $class_method_name
Class method name to generate.
=item B<options> => \%options
Options to pass to L<MR::Taranatool::Box->Call|MR::Taranatool::Box/Call> method.
=item B<params> => \@names
Procedure input parameters' names
=item B<params_default> => \@defaults
Procedure input parameters default values. Undefined or absent value makes
its parameter mandatory.
=item B<params_format> => \@format
C<< pack() >>-compatible format to pack input parameters. Must match C<params>.
=item B<unpack_format> => $format
C<< pack() >>-compatible format to unpack procedure output.
=back
=item B<%sp_params>:
C<< Name => $value >> pairs.
=item B<%optional_options>:
Options to pass to L<MR::Taranatool::Box->Call|MR::Taranatool::Box/Call> method.
This overrides C<< %options >> values key-by-key.
=back
=cut
sub declare_stored_procedure {
my($class, %opts) = @_;
my $name = delete $opts{name} or confess "No `name` given";
my $options = $opts{options} || {};
confess "no `params` given; it must be an arrayref" if !exists $opts{params} or ref $opts{params} ne 'ARRAY';
my @params = @{$opts{params}};
my $pack;
if(my $fn = $opts{pack}) {
confess "`params_format` and `params_default` are not applicable while `pack` is in use" if exists $opts{params_format} or exists $opts{params_default};
if(ref $fn) {
confess "`pack` can be code ref or a method name, nothing else" unless ref $fn eq 'CODE';
$pack = $fn;
} else {
confess "`pack` method $fn is not provided by class ${class}" unless $class->can($fn);
$pack = sub { $class->$fn(@_) };
}
} else {
confess "no `pack` nor `params_format` given; it must be an arrayref with number of elements exactly as in `params`" if !exists $opts{params_format} or ref $opts{params_format} ne 'ARRAY' or @{$opts{params_format}} != @params;
confess "`params_default` is given but it must be an arrayref with number of elements no more then in `params`" if exists $opts{params_format} and (ref $opts{params_format} ne 'ARRAY' or @{$opts{params_format}} > @params);
my @fmt = @{$opts{params_format}};
my @def = @{$opts{params_default}||[]};
$pack = sub {
my $p = $_[0];
for my $i (0..$#params) {
$p->[$i] = $def[$i] if !defined$p->[$i] and $i < @def;
confess "All params must be defined" unless defined $p->[$i];
$p->[$i] = pack $fmt[$i], $p->[$i];
}
return $p;
};
}
my $unpack;
if(my $fn = $opts{unpack}) {
if(ref $fn) {
confess "`unpack` can be code ref or a method name, nothing else" unless ref $fn eq 'CODE';
$unpack = $fn;
} else {
confess "`unpack` method $fn is not provided by class ${class}" unless $class->can($fn);
$unpack = sub { $class->$fn(@_) };
}
if ($opts{unpack_raw}) {
$options->{unpack} = $unpack;
undef $unpack;
}
$options->{unpack_format} = '&*';
} else {
confess "no `unpack` nor `unpack_format` given" if !exists $opts{unpack_format};
my $f = $opts{unpack_format};
$f = join '', @$f if ref $f;
$options->{unpack_format} = $f;
}
my $method = $opts{method_name} or confess "`method_name` not given";
confess "bad `method_name` $method" unless $method =~ m/^[a-zA-Z]\w*$/;
my $fn = "${class}::${method}";
confess "Method $method is already defined in class $class" if defined &{$fn};
do {
no strict 'refs';
*$fn = sub {
my $p0 = @_ && ref $_[-1] eq 'HASH' ? pop : {};
my $param = { %$options, %$p0 };
my ($class, %params) = @_;
my $res = $class->Call($name, $pack->([@params{@params}]), $param) or return;
return $res unless $unpack;
return $unpack->($res);
}
};
return $method;
}
sub Param {
confess "bad Param call" unless $_[2];
return $_[2] && @{$_[2]} && ref $_[2]->[-1] eq 'HASH' && pop @{$_[2]} || {};
}
=pod
=head3 Configuration methods
=over
=item B<SERVER>
Must return a string of ip:port of I<master> server.
=item B<REPLICAS>
Must return a comma separated string of ip:port pairs of I<replica> servers (see L</is_replica>).
Server is chosen from the list randomly.
=item B<MR_TARANTOOL_BOX_CLASS>
Must return name of the class implementing L<MR::Tarantool::Box> interface, or it's descendant.
=item B<SPACES>, B<RAISE>, B<TIMEOUT>, B<SELECT_TIMEOUT>, B<RETRY>, B<SELECT_RETRY>, B<SOFT_RETRY>, B<DEBUG>
See corresponding arguments of L<MR::Tarantool::Box->new|MR::Tarantool::Box/new> method.
=back
=cut
sub DEBUG () { 0 }
sub IPDEBUG () { 0 }
sub TIMEOUT () { 23 }
sub SELECT_TIMEOUT () { 2 }
sub RAISE () { 1 }
sub RETRY () { 1 }
sub SELECT_RETRY () { 3 }
sub SOFT_RETRY () { 3 }
sub RETRY_DELAY () { 1 }
sub SERVER () { die }
sub REPLICAS () { [] }
sub MR_TARANTOOL_BOX_CLASS () { 'MR::Tarantool::Box' }
sub SPACES () { die }
sub DEFAULT_SPACE () { undef }
sub _new_instance {
my ($class) = @_;
my ($config) = $class->can('_config') ? $class->_config : {};
$config->{param} ||= {};
$config->{servers} ||= $class->SERVER;
$config->{param}->{name} ||= $class;
$config->{param}->{spaces} ||= $class->SPACES;
$config->{param}->{default_fields} ||= [ $class->FIELDS ] if $class->can('FIELDS');
$config->{param}->{default_long_fields}||= [ $class->LONG_FIELDS ] if $class->can('LONG_FIELDS');
$config->{param}->{raise} = $class->RAISE unless defined $config->{param}->{raise};
$config->{param}->{timeout} ||= $class->TIMEOUT;
$config->{param}->{select_timeout} ||= $class->SELECT_TIMEOUT;
$config->{param}->{debug} ||= $class->DEBUG;
$config->{param}->{ipdebug} ||= $class->IPDEBUG;
$config->{param}->{retry} ||= $class->RETRY;
$config->{param}->{select_retry} ||= $class->SELECT_RETRY;
$config->{param}->{softretry} ||= $class->SOFT_RETRY;
$config->{param}->{retry_delay} ||= $class->RETRY_DELAY;
my $replicas = delete $config->{replicas} || $class->REPLICAS || [];
$replicas = [ split /,/, $replicas ] unless ref $replicas eq 'ARRAY';
$class->CheckConfig($config);
return bless {
box => $class->MR_TARANTOOL_BOX_CLASS->new({ servers => $config->{servers}, %{$config->{param}} }),
replicas => [ map { $class->MR_TARANTOOL_BOX_CLASS->new({ servers => $_, %{$config->{param}} }) } shuffle @$replicas ],
}, $class;
}
sub CheckConfig {}
=pod
=head3 Add, Insert, Replace, UpdateMulti, Delete
These methods operate on C<< SERVER >> only.
See corresponding methods of L<MR::Tarantool::Box> class.
=head3 Select, Call
These methods operate on C<< SERVER >> at first, and then B<may>
try to query C<< REPLICAS >>.
See corresponding methods of L<MR::Tarantool::Box> class.
These methods have additional C<< %options >> params:
=over
=item B<is_replica> => \$is_result_from_replica
If this option is set, then if the query to C<< SERVER >> fails,
C<< REPLICAS >> will be queried one-by-one until query succeeds or
the list ends, and C<< $is_result_from_replica >> will be set to
C<< true >>, no matter whether any query succeeds or not.
=back
=cut
BEGIN {
foreach my $method (qw/Insert UpdateMulti Delete Add Set Replace Bit Num AndXorAdd Update/) {
no strict 'refs';
*$method = sub {
use strict;
my ($class, @args) = @_;
my $param = $class->Param($method, \@args);
my $self = $class->instance;
$self->{_last_box} = $self->{box};
$self->{box}->$method(@args, $param);
};
}
foreach my $method (qw/Select SelectUnion Call/) {
no strict 'refs';
*$method = sub {
use strict;
my ($class, @args) = @_;
my $param = $class->Param($method, \@args);
if ($param->{format}) {
my @F;
my $F = $class->FIELDS_HASH;
my @format = ref $param->{format} eq 'ARRAY' ? @{$param->{format}} : %{$param->{format}};
confess "Odd number of elements in format" if @format % 2;
$param->{format} = [];
while( my ($field, $fmt) = splice(@format, 0, 2) ) {
confess "Bad format for field `$field'" unless $fmt;
confess "Unknown field `$field'" unless exists $F->{$field};
push @F, $field;
push @{$param->{format}}, {
field => $F->{$field},
$fmt eq 'full' ? (
full => 1,
) : (
offset => $fmt->{offset} || 0,
length => (exists $fmt->{length} ? $fmt->{length}||0 : 'max'),
),
};
}
$param->{hashify} = sub { $class->_hashify(\@F, @_) };
}
die "${class}\->${method}: is_replica must be a SCALARREF" if exists $param->{is_replica} && ref $param->{is_replica} ne 'SCALAR';
my $is_rep = delete $param->{is_replica};
$$is_rep = 0 if $is_rep;
my $self = $class->instance;
my @rep = $is_rep ? @{ $self->{replicas} } : ();
my ($ret,@ret);
for(my $box = $self->{box}; $box; $box = shift @rep) {
$self->{_last_box} = $box;
if(wantarray) {
@ret = $box->$method(@args, $param);
} elsif(defined wantarray) {
$ret = $box->$method(@args, $param);
} else {
$box->$method(@args, $param);
}
last if !$box->Error or !$is_rep or !@rep;
++$$is_rep;
}
return wantarray ? @ret : $ret;
};
}
}
=pod
=head3 B<Error>, B<ErrorStr>
Return error code or description (see <MR::Tarantool::Box|MR::Tarantool::Box/Error>).
=cut
sub Error {
my ($class, @args) = @_;
$class->instance->{_last_box}->Error(@args);
}
sub ErrorStr {
my ($class, @args) = @_;
$class->instance->{_last_box}->ErrorStr(@args);
}
=pod
=head1 LICENCE AND COPYRIGHT
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
=head1 SEE ALSO
L<http://tarantool.org>
L<MR::Tarantool::Box>
=cut
1;
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