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# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Mozilla Corporation.
# Portions created by the Initial Developer are Copyright (C) 2008
# Mozilla Corporation. All Rights Reserved.
#
# Contributor(s):
# Mark Smith <mark@mozilla.com>
# Max Kanat-Alexander <mkanat@bugzilla.org>
package Bugzilla::JobQueue;
use strict;
use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Install::Util qw(install_string);
use File::Slurp;
use base qw(TheSchwartz);
use fields qw(_worker_pidfile);
# 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->{private_bz_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;
}
# To avoid memory leaks/fragmentation which tends to happen for long running
# perl processes; check for jobs, and spawn a new process to empty the queue.
sub subprocess_worker {
my $self = shift;
my $command = "$0 -p '" . $self->{_worker_pidfile} . "' onepass";
while (1) {
my $time = (time);
my @jobs = $self->list_jobs({
funcname => $self->{all_abilities},
run_after => $time,
grabbed_until => $time,
limit => 1,
});
if (@jobs) {
$self->debug("Spawning queue worker process");
# Run the worker as a daemon
system $command;
# And poll the PID to detect when the working has finished.
# We do this instead of system() to allow for the INT signal to
# interrup us and trigger kill_worker().
my $pid = read_file($self->{_worker_pidfile}, err_mode => 'quiet');
if ($pid) {
sleep(3) while(kill(0, $pid));
}
$self->debug("Queue worker process completed");
} else {
$self->debug("No jobs found");
}
sleep(5);
}
}
sub kill_worker {
my $self = Bugzilla->job_queue();
if ($self->{_worker_pidfile} && -e $self->{_worker_pidfile}) {
my $worker_pid = read_file($self->{_worker_pidfile});
if ($worker_pid && kill(0, $worker_pid)) {
$self->debug("Stopping worker process");
system "$0 -f -p '" . $self->{_worker_pidfile} . "' stop";
}
}
}
sub set_pidfile {
my ($self, $pidfile) = @_;
$pidfile =~ s/^(.+)(\..+)$/$1.worker$2/;
$self->{_worker_pidfile} = $pidfile;
}
# Clear the request cache at the start of each run.
sub work_once {
my $self = shift;
Bugzilla->clear_request_cache();
return $self->SUPER::work_once(@_);
}
# 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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