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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.
package Bugzilla::JobQueue;
use 5.10.1;
use strict;
use warnings;
use Bugzilla::Logging;
use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Install::Util qw(install_string);
use Bugzilla::DaemonControl qw(catch_signal);
use IO::Async::Timer::Periodic;
use IO::Async::Loop;
use Future;
use base qw(TheSchwartz);
# This maps job names for Bugzilla::JobQueue to the appropriate modules.
# If you add new types of jobs, you should add a mapping here.
use constant JOB_MAP => {
send_mail => 'Bugzilla::Job::Mailer',
bug_mail => 'Bugzilla::Job::BugMail',
};
# Without a driver cache TheSchwartz opens a new database connection
# for each email it sends. This cached connection doesn't persist
# across requests.
use constant DRIVER_CACHE_TIME => 300; # 5 minutes
# To avoid memory leak/fragmentation, a worker process won't process more than
# MAX_MESSAGES messages.
use constant MAX_MESSAGES => 75;
sub job_map {
if (!defined(Bugzilla->request_cache->{job_map})) {
my $job_map = JOB_MAP;
Bugzilla::Hook::process('job_map', { job_map => $job_map });
Bugzilla->request_cache->{job_map} = $job_map;
}
return Bugzilla->request_cache->{job_map};
}
sub new {
my $class = shift;
if (!Bugzilla->feature('jobqueue')) {
ThrowCodeError('feature_disabled', { feature => 'jobqueue' });
}
my $lc = Bugzilla->localconfig;
# We need to use the main DB as TheSchwartz module is going
# to write to it.
my $self = $class->SUPER::new(
databases => [{
dsn => Bugzilla->dbh_main->dsn,
user => $lc->{db_user},
pass => $lc->{db_pass},
prefix => 'ts_',
}],
driver_cache_expiration => DRIVER_CACHE_TIME,
);
return $self;
}
# A way to get access to the underlying databases directly.
sub bz_databases {
my $self = shift;
my @hashes = keys %{ $self->{databases} };
return map { $self->driver_for($_) } @hashes;
}
# inserts a job into the queue to be processed and returns immediately
sub insert {
my $self = shift;
my $job = shift;
my $mapped_job = Bugzilla::JobQueue->job_map()->{$job};
ThrowCodeError('jobqueue_no_job_mapping', { job => $job })
if !$mapped_job;
unshift(@_, $mapped_job);
my $retval = $self->SUPER::insert(@_);
# XXX Need to get an error message here if insert fails, but
# I don't see any way to do that in TheSchwartz.
ThrowCodeError('jobqueue_insert_failed', { job => $job, errmsg => $@ })
if !$retval;
return $retval;
}
sub debug {
my ($self, @args) = @_;
my $caller_pkg = caller;
local $Log::Log4perl::caller_depth = $Log::Log4perl::caller_depth + 1;
my $logger = Log::Log4perl->get_logger($caller_pkg);
if ($args[0] && $args[0] eq "TheSchwartz::work_once found no jobs") {
$logger->trace(@args);
}
else {
$logger->info(@args);
}
}
sub work {
my ($self, $delay) = @_;
$delay ||= 1;
my $loop = IO::Async::Loop->new;
my $timer = IO::Async::Timer::Periodic->new(
first_interval => 0,
interval => $delay,
reschedule => 'drift',
on_tick => sub { $self->work_once }
);
DEBUG("working every $delay seconds");
$loop->add($timer);
$timer->start;
Future->wait_any(map { catch_signal($_) } qw( INT TERM HUP ))->get;
$timer->stop;
$loop->remove($timer);
}
# Clear the request cache at the start of each run.
sub work_once {
my $self = shift;
my $val = $self->SUPER::work_once(@_);
Bugzilla::Hook::process('request_cleanup');
Bugzilla::Bug->CLEANUP;
Bugzilla->clear_request_cache();
return $val;
}
# Never process more than MAX_MESSAGES in one batch, to avoid memory
# leak/fragmentation issues.
sub work_until_done {
my $self = shift;
my $count = 0;
while ($count++ < MAX_MESSAGES) {
$self->work_once or last;
}
}
1;
__END__
=head1 NAME
Bugzilla::JobQueue - Interface between Bugzilla and TheSchwartz.
=head1 SYNOPSIS
use Bugzilla;
my $obj = Bugzilla->job_queue();
$obj->insert('send_mail', { msg => $message });
=head1 DESCRIPTION
Certain tasks should be done asyncronously. The job queue system allows
Bugzilla to use some sort of service to schedule jobs to happen asyncronously.
=head2 Inserting a Job
See the synopsis above for an easy to follow example on how to insert a
job into the queue. Give it a name and some arguments and the job will
be sent away to be done later.
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