/usr/lib/obs/server/BSSched/RPC.pm is in obs-server 2.7.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program (see the file COPYING); if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
package BSSched::RPC;
use strict;
use warnings;
use Data::Dumper;
use BSRPC;
use BSUtil;
use BSConfiguration;
=head1 NAME
BSSched::RPC
=head1 DESCRIPTION
TODO: add description
=head1 SYNOPSIS
=head1 METHODS
=head2 new - create a new rpc manager
TODO: add description
=cut
sub new {
my ($class, @conf) = @_;
my $rctx = {
'iswaiting' => {},
'iswaiting_server' => {},
'iswaiting_serverload' => {},
'iswaiting_serverload_low' => {},
'resumed_highload' => 0,
'wakeupfunction' => sub { die("BSSched::RPC: no wakeupfunction defined\n") },
@conf
};
return bless $rctx, $class;
}
=head2 is_transient_error - TODO: add summary
TODO: add description
=cut
sub is_transient_error {
my ($error) = @_;
return 1 if $error =~ /^5\d\d/;
if ($error =~ /^400/) {
return 1 if $error =~ /Too many open files/;
return 1 if $error =~ /No space left on device/;
return 1 if $error =~ /Not enough space/;
return 1 if $error =~ /Resource temporarily unavailable/;
}
return 0 if $error =~ /remote error:/;
return 1;
}
=head2 xrpc - TODO: add summary
TODO: add description
=cut
sub xrpc {
my ($rctx, $ctx, $resource, $param, @args) = @_;
my $async = $param->{'async'};
return BSRPC::rpc($param, @args) unless $async;
my $iswaiting = $rctx->{'iswaiting'};
my $rhandle = $iswaiting->{$resource};
if ($rhandle) {
# resource is busy. Enqueue.
if (!$ctx->{'_orderedrpcs'} && $ctx->{'changeprp'}) {
# xrpc resulted from looking at a prp. Just do that again. Order does not matter.
my $handle = { '_ctx' => $ctx};
$handle->{$_} = $async->{$_} for keys %$async;
push @{$rhandle->{'_wakeup'}}, $handle;
return $handle;
}
# project rpcs, we need to run them in order
my $handle = { '_xrpc_data' => [$ctx, $resource, $param, @args] };
push @{$rhandle->{'_nextxrpc'}}, $handle;
return $handle;
}
# free to get resource from server
my $server = $param->{'uri'};
$server =~ s/.*?\/\///;
$server =~ s/\/.*//;
my $maxserverload = $rctx->{'maxserverload'};
my $iswaiting_server = $rctx->{'iswaiting_server'};
my $serverload = scalar(keys %{$iswaiting_server->{$server} || {}});
if (defined($maxserverload) && $serverload >= $maxserverload) {
# load too high. postpone.
my $handle = { '_xrpc_data' => [$ctx, $resource, $param, @args] };
if (($async->{'_changetype'} || $ctx->{'changetype'} || '') ne 'low') {
push @{$rctx->{'iswaiting_serverload'}->{$server}}, $handle;
} else {
push @{$rctx->{'iswaiting_serverload_low'}->{$server}}, $handle;
}
$handle->{'_iswaiting'} = $resource;
$handle->{'_server'} = $server;
$iswaiting->{$resource} = $handle;
return $handle;
}
my $handle = BSRPC::rpc($param, @args);
$handle->{'_ctx'} = $ctx;
$handle->{'_iswaiting'} = $resource;
$handle->{'_server'} = $server;
$handle->{$_} = $async->{$_} for keys %$async;
$iswaiting->{$resource} = $handle;
$iswaiting_server->{$server}->{$resource} = 1;
return $handle;
}
=head2 xrpc_addwakeup - TODO: add summary
TODO: add description
=cut
sub xrpc_addwakeup {
my ($rctx, $ctx, $resource) = @_;
my $iswaiting = $rctx->{'iswaiting'};
my $rhandle = $iswaiting->{$resource};
die("addwakeup to not busy resource '$resource'\n") unless $rhandle;
my $handle = { '_ctx' => $ctx };
push @{$rhandle->{'_wakeup'}}, $handle;
return $handle;
}
=head2 xrpc_handles - return all active handles
TODO: add description
=cut
sub xrpc_handles {
my ($rctx) = @_;
my $iswaiting = $rctx->{'iswaiting'};
return values(%$iswaiting);
}
=head2 xrpc_busy - check if a request to a resource is in progress
TODO: add description
=cut
sub xrpc_busy {
my ($rctx, $resource) = @_;
return %{$rctx->{'iswaiting'}} ? 1 : 0 unless defined $resource;
return $rctx->{'iswaiting'}->{$resource} ? 1 : 0;
}
=head2 xrpc_printstats - print some statistics about running requests
TODO: add description
=cut
sub xrpc_printstats {
my ($rctx) = @_;
my $iswaiting = $rctx->{'iswaiting'};
return unless %$iswaiting;
my $iswaiting_server = $rctx->{'iswaiting_server'};
my $iswaiting_serverload = $rctx->{'iswaiting_serverload'};
my $iswaiting_serverload_low = $rctx->{'iswaiting_serverload_low'};
print "running async RPC requests:\n";
for my $server (sort keys %$iswaiting_server) {
next unless %{$iswaiting_server->{$server} || {}};
print " - $server: ".scalar(keys %{$iswaiting_server->{$server}})." running, ".@{$iswaiting_serverload->{$server} || []}."/".@{$iswaiting_serverload_low->{$server} || []}." waiting\n";
}
}
sub xrpc_resume_nextrpc {
my ($rctx, $nextrpc) = @_;
my $handle;
eval {
$handle = xrpc($rctx, @{$nextrpc->{'_xrpc_data'}});
};
if (!$@ && $handle) {
# copy over handle additions
for (keys %$nextrpc) {
$handle->{$_} = $nextrpc->{$_} if $_ ne '_xrpc_data';
}
return;
}
my $error = $@ || "internal xrpc_resume_nextrpc error\n";
# create fake handle, call resume function with the error
my ($ctx, $resource, $param, @args) = @{$nextrpc->{'_xrpc_data'}};
my $async = $param->{'async'};
$handle = {};
$handle->{'_ctx'} = $ctx;
$handle->{'_iswaiting'} = $resource;
$handle->{$_} = $async->{$_} for keys %$async;
for (keys %$nextrpc) {
$handle->{$_} = $nextrpc->{$_} if $_ ne '_xrpc_data';
}
die("no _resume set in handler $handle\n") unless $handle->{'_resume'};
$handle->{'_resume'}->($handle->{'_ctx'}, $handle, $error);
}
=head2 xrpc_resume - to be called when a rpc handle can be processed
TODO: add description
=cut
sub xrpc_resume {
my ($rctx, $handle) = @_;
# iswaiting rpc, finish...
my $iswaiting = $rctx->{'iswaiting'};
my $iswaiting_server = $rctx->{'iswaiting_server'};
my $iswaiting_serverload = $rctx->{'iswaiting_serverload'};
my $iswaiting_serverload_low = $rctx->{'iswaiting_serverload_low'};
my $iw = $handle->{'_iswaiting'};
my $server = $handle->{'_server'};
print "response from RPC $iw ($handle->{'uri'})\n";
delete $iswaiting->{$iw};
delete $iswaiting_server->{$server}->{$iw};
# fire up rpcs delayed because of server load
if ($iswaiting_serverload->{$server} || $iswaiting_serverload_low->{$server}) {
my @loadrpcs;
my @loadrpcs_low;
@loadrpcs = @{delete $iswaiting_serverload->{$server}} if $iswaiting_serverload->{$server};
@loadrpcs_low = @{delete $iswaiting_serverload_low->{$server}} if $iswaiting_serverload_low->{$server};
while (@loadrpcs || @loadrpcs_low) {
my $nextrpc;
if ((@loadrpcs && $rctx->{'resumed_highload'}++ < 2) || !@loadrpcs_low) {
$nextrpc = shift @loadrpcs;
} else {
$rctx->{'resumed_highload'} = 0;
$nextrpc = shift @loadrpcs_low;
}
my $resource = $nextrpc->{'_iswaiting'};
delete $iswaiting->{$resource};
xrpc_resume_nextrpc($rctx, $nextrpc);
last if $iswaiting_serverload->{$server} || $iswaiting_serverload_low->{$server};
}
push @{$iswaiting_serverload->{$server}}, @loadrpcs;
push @{$iswaiting_serverload_low->{$server}}, @loadrpcs_low;
}
# get result of rpc
my $ret;
eval { $ret = BSRPC::rpc($handle) };
my $error;
if ($@) {
warn $@;
$error = $@;
chomp $error;
}
# run result handler
die("no _resume set in handler $handle\n") unless $handle->{'_resume'};
$handle->{'_resume'}->($handle->{'_ctx'}, $handle, $error, $ret);
# fire up waiting rpcs
for my $nextrpc (@{$handle->{'_nextxrpc'} || []}) {
xrpc_resume_nextrpc($rctx, $nextrpc);
}
# call wakeup function
if (@{$handle->{'_wakeup'} || []}) {
my %did;
for my $whandle (BSUtil::unify(@{$handle->{'_wakeup'} || []})) {
my $wctx = $whandle->{'_ctx'};
my $changeprp = $whandle->{'_changeprp'} || $wctx->{'changeprp'};
my $changetype = $whandle->{'_changetype'} || $wctx->{'changetype'} || 'high';
my $changelevel = $whandle->{'_changelevel'} || $wctx->{'changelevel'} || 1;
next if !$changeprp || $did{"$changeprp/$changetype/$changelevel"};
$did{"$changeprp/$changetype/$changelevel"} = 1;
$rctx->{'wakeupfunction'}->($wctx, $whandle);
}
}
}
sub xrpc_nextparams {
my ($rctx, $handle) = @_;
return map {$_->{'_xrpc_data'}->[2]} @{$handle->{'_nextxrpc'} || []};
}
1;
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