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mysql.pm
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package Minion::Backend::mysql;
use Mojo::Base 'Minion::Backend';
use Mojo::IOLoop;
use Mojo::JSON qw(encode_json decode_json);
use Mojo::mysql;
use Sys::Hostname 'hostname';
has 'mysql';
our $VERSION = '0.04';
sub dequeue {
my ($self, $id, $wait, $options) = @_;
if ((my $job = $self->_try($id, $options))) { return $job }
return undef if Mojo::IOLoop->is_running;
my $cb = $self->mysql->pubsub->listen("minion.job" => sub {
Mojo::IOLoop->stop;
});
my $timer = Mojo::IOLoop->timer($wait => sub { Mojo::IOLoop->stop });
Mojo::IOLoop->start;
$self->mysql->pubsub->unlisten("minion.job" => $cb) and Mojo::IOLoop->remove($timer);
return $self->_try($id, $options);
}
sub enqueue {
my ($self, $task) = (shift, shift);
my $args = shift // [];
my $options = shift // {};
my $db = $self->mysql->db;
my $seconds = $db->dbh->quote($options->{delay} // 0);
$db->query(
"insert into minion_jobs (`args`, `delayed`, `priority`, `queue`, `task`)
values (?, (DATE_ADD(NOW(), INTERVAL $seconds SECOND)), ?, ?, ?)",
encode_json($args), $options->{priority} // 0,
$options->{queue} // 'default', $task
);
my $job_id = $db->dbh->{mysql_insertid};
$self->mysql->pubsub->notify("minion.job" => $job_id);
return $job_id;
}
sub fail_job { shift->_update(1, @_) }
sub finish_job { shift->_update(0, @_) }
sub job_info {
my $hash = shift->mysql->db->query(
'select id, `args`, UNIX_TIMESTAMP(`created`) as `created`,
UNIX_TIMESTAMP(`delayed`) as `delayed`,
UNIX_TIMESTAMP(`finished`) as `finished`, `priority`, `queue`, `result`,
UNIX_TIMESTAMP(`retried`) as `retried`, COALESCE(`retries`, 0) as retries,
UNIX_TIMESTAMP(`started`) as `started`, `state`, `task`, `worker`
from minion_jobs where id = ?', shift
)->hash;
return undef unless $hash;
$hash->{args} = $hash->{args} ? decode_json($hash->{args}) : undef;
$hash->{result} = $hash->{result} ? decode_json($hash->{result}) : undef;
return $hash;
}
sub list_jobs {
my ($self, $offset, $limit, $options) = @_;
my $state = $options->{state} ? "state in (?)" : "1";
my $task = $options->{task} ? "task in (?)" : "1";
my @args = ($limit, $offset);
unshift(@args, $options->{task}) if $options->{task};
unshift(@args, $options->{state}) if $options->{state};
return $self->mysql->db->query(
"select id from minion_jobs
where ($state) and ($task)
order by id desc
limit ?
offset ?", @args
)->arrays->map(sub { $self->job_info($_->[0]) })->to_array;
}
sub list_workers {
my ($self, $offset, $limit) = @_;
my $sql = 'select id from minion_workers order by id desc limit ? offset ?';
return $self->mysql->db->query($sql, $limit, $offset)
->arrays->map(sub { $self->worker_info($_->[0]) })->to_array;
}
sub new {
my $self = shift->SUPER::new(mysql => Mojo::mysql->new(@_));
my $mysql = $self->mysql->max_connections(1);
$mysql->migrations->name('minion')->from_data;
$mysql->once(connection => sub { shift->migrations->migrate });
return $self;
}
sub register_worker {
my ($self, $id) = @_;
### TODO: is this the same business logic?
if ($id) {
my $sql
= 'update minion_workers set notified = now() where id = ?';
return $id if $self->mysql->db->query($sql, $id)->{affected_rows};
}
my $db = $self->mysql->db;
my $sql = 'insert into minion_workers (host, pid) values (?, ?)';
$db->query($sql, hostname, $$);
return $db->dbh->{mysql_insertid};
}
sub remove_job {
!!shift->mysql->db->query(
"delete from minion_jobs
where id = ? and state in ('inactive', 'failed', 'finished')",
shift
)->{affected_rows};
}
sub repair {
my $self = shift;
# Check worker registry
my $db = $self->mysql->db;
my $minion = $self->minion;
$db->query(
"delete from minion_workers
where notified < (DATE_ADD(NOW(), INTERVAL ? SECOND))", $minion->missing_after
);
# Abandoned jobs
$db->query(
"update minion_jobs as j
set finished = now(), result = ?,
state = 'failed'
where state = 'active'
and not exists(select 1 from minion_workers where id = j.worker)",
encode_json('Worker went away')
);
# Old jobs
$db->query(
"delete from minion_jobs
where state = 'finished' and finished < (DATE_SUB(NOW(), INTERVAL ? SECOND))",
$minion->remove_after
);
}
sub reset {
my $self = shift;
$self->mysql->db->query("truncate table minion_jobs");
$self->mysql->db->query("truncate table minion_workers");
}
sub retry_job {
my ($self, $id, $retries) = (shift, shift, shift);
my $options = shift // {};
my $seconds = $self->mysql->db->dbh->quote($options->{delay} // 0);
return !!$self->mysql->db->query(
"update `minion_jobs`
set `finished` = 0, priority = coalesce(?, priority),
`queue` = coalesce(?, queue), `result` = null, `retried` = now(),
`retries` = retries + 1, `started` = 0, `state` = 'inactive',
`worker` = null, `delayed` = (DATE_ADD(NOW(), INTERVAL $seconds SECOND))
where `id` = ? and retries = ? and `state` in ('failed', 'finished')",
@$options{qw(priority queue)}, $id, $retries
)->{affected_rows};
}
sub stats {
my $self = shift;
my $db = $self->mysql->db;
my $all = $db->query('select count(*) from minion_workers')->array->[0];
my $sql
= "select count(distinct worker) from minion_jobs where state = 'active'";
my $active = $db->query($sql)->array->[0];
#### TODO: odd $a and $b weren't working, or something
$sql = 'select state, count(state) from minion_jobs group by 1';
my $results
= $db->query($sql); # ->reduce(sub { $a->{$b->[0]} = $b->[1]; $a }, {});
my $states = {};
while (my $next = $results->array) {
$states->{$next->[0]} = $next->[1];
}
return {
active_workers => $active,
inactive_workers => $all - $active,
active_jobs => $states->{active} || 0,
inactive_jobs => $states->{inactive} || 0,
failed_jobs => $states->{failed} || 0,
finished_jobs => $states->{finished} || 0,
};
}
sub unregister_worker {
shift->mysql->db->query('delete from minion_workers where id = ?', shift);
}
sub worker_info {
my ($self, $id) = @_;
my $hash = $self->mysql->db->query(
"select `id`, UNIX_TIMESTAMP(`notified`) as `notified`, `host`,
`pid`, UNIX_TIMESTAMP(`started`) as `started`
from `minion_workers`
where id = ?", $id
)->hash;
return undef unless $hash;
my $jobs = $self->mysql->db->query(
"select `id` from `minion_jobs`
where `state` = 'active' and `worker` = ?", $id
)->arrays()->flatten->to_array;
$hash->{jobs} = $jobs;
return $hash;
}
sub _try {
my ($self, $id, $options) = @_;
my $tasks = [keys %{$self->minion->tasks}];
my $qq = join(", ", map({ "?" } @{ $options->{queues} // ['default'] }));
my $qt = join(", ", map({ "?" } @{ $tasks }));
my $db = $self->mysql->db;
my $tx = $db->begin;
my $job = $tx->db->query(qq(select id, args, retries, task from minion_jobs
where state = 'inactive' and `delayed` <= NOW() and queue in ($qq)
and task in ($qt)
order by priority desc, created limit 1 for update),
@{ $options->{queues} || ['default']}, @{ $tasks }
)->hash;
return undef unless $job;
$tx->db->query(
qq(update minion_jobs set started = now(), state = 'active', worker = ? where id = ?),
$id, $job->{id}
);
$tx->commit;
$job->{args} = $job->{args} ? decode_json($job->{args}) : undef;
$job;
}
sub _update {
my ($self, $fail, $id, $retries, $result) = @_;
return !!$self->mysql->db->query(
"update minion_jobs
set finished = now(), result = ?, state = ?
where id = ? and retries = ? and state = 'active'",
encode_json($result), $fail ? 'failed' : 'finished', $id,
$retries
)->{affected_rows};
}
1;
=encoding utf8
=head1 NAME
Minion::Backend::mysql - MySQL backend
=head1 SYNOPSIS
use Mojolicious::Lite;
plugin Minion => {mysql => 'mysql://user@127.0.0.1/minion_jobs'};
# Slow task
app->minion->add_task(poke_mojo => sub {
my $job = shift;
$job->app->ua->get('mojolicio.us');
$job->app->log->debug('We have poked mojolicio.us for a visitor');
});
# Perform job in a background worker process
get '/' => sub {
my $c = shift;
$c->minion->enqueue('poke_mojo');
$c->render(text => 'We will poke mojolicio.us for you soon.');
};
app->start;
=head1 DESCRIPTION
L<Minion::Backend::mysql> is a backend for L<Minion> based on L<Mojo::mysql>. All
necessary tables will be created automatically with a set of migrations named
C<minion>. This backend has been tested on v5.5 of MySQL.
=head1 ATTRIBUTES
L<Minion::Backend::mysql> inherits all attributes from L<Minion::Backend> and
implements the following new ones.
=head2 mysql
my $mysql = $backend->mysql;
$backend = $backend->mysql(Mojo::mysql->new);
L<Mojo::mysql> object used to store all data.
=head1 METHODS
L<Minion::Backend::mysql> inherits all methods from L<Minion::Backend> and
implements the following new ones.
=head2 dequeue
my $job_info = $backend->dequeue($worker_id, 0.5);
my $job_info = $backend->dequeue($worker_id, 0.5, {queues => ['important']});
Wait for job, dequeue it and transition from C<inactive> to C<active> state or
return C<undef> if queues were empty.
These options are currently available:
=over 2
=item queues
queues => ['important']
One or more queues to dequeue jobs from, defaults to C<default>.
=back
These fields are currently available:
=over 2
=item args
args => ['foo', 'bar']
Job arguments.
=item id
id => '10023'
Job ID.
=item retries
retries => 3
Number of times job has been retried.
=item task
task => 'foo'
Task name.
=back
=head2 enqueue
my $job_id = $backend->enqueue('foo');
my $job_id = $backend->enqueue(foo => [@args]);
my $job_id = $backend->enqueue(foo => [@args] => {priority => 1});
Enqueue a new job with C<inactive> state.
These options are currently available:
=over 2
=item delay
delay => 10
Delay job for this many seconds (from now).
=item priority
priority => 5
Job priority, defaults to C<0>.
=item queue
queue => 'important'
Queue to put job in, defaults to C<default>.
=back
=head2 fail_job
my $bool = $backend->fail_job($job_id, $retries);
my $bool = $backend->fail_job($job_id, $retries, 'Something went wrong!');
my $bool = $backend->fail_job(
$job_id, $retries, {msg => 'Something went wrong!'});
Transition from C<active> to C<failed> state.
=head2 finish_job
my $bool = $backend->finish_job($job_id, $retries);
my $bool = $backend->finish_job($job_id, $retries, 'All went well!');
my $bool = $backend->finish_job($job_id, $retries, {msg => 'All went well!'});
Transition from C<active> to C<finished> state.
=head2 job_info
my $job_info = $backend->job_info($job_id);
Get information about a job or return C<undef> if job does not exist.
# Check job state
my $state = $backend->job_info($job_id)->{state};
# Get job result
my $result = $backend->job_info($job_id)->{result};
These fields are currently available:
=over 2
=item args
args => ['foo', 'bar']
Job arguments.
=item created
created => 784111777
Time job was created.
=item delayed
delayed => 784111777
Time job was delayed to.
=item finished
finished => 784111777
Time job was finished.
=item priority
priority => 3
Job priority.
=item queue
queue => 'important'
Queue name.
=item result
result => 'All went well!'
Job result.
=item retried
retried => 784111777
Time job has been retried.
=item retries
retries => 3
Number of times job has been retried.
=item started
started => 784111777
Time job was started.
=item state
state => 'inactive'
Current job state, usually C<active>, C<failed>, C<finished> or C<inactive>.
=item task
task => 'foo'
Task name.
=item worker
worker => '154'
Id of worker that is processing the job.
=back
=head2 list_jobs
my $batch = $backend->list_jobs($offset, $limit);
my $batch = $backend->list_jobs($offset, $limit, {state => 'inactive'});
Returns the same information as L</"job_info"> but in batches.
These options are currently available:
=over 2
=item state
state => 'inactive'
List only jobs in this state.
=item task
task => 'test'
List only jobs for this task.
=back
=head2 list_workers
my $batch = $backend->list_workers($offset, $limit);
Returns the same information as L</"worker_info"> but in batches.
=head2 new
my $backend = Minion::Backend::mysql->new('mysql://mysql@/test');
Construct a new L<Minion::Backend::mysql> object.
=head2 register_worker
my $worker_id = $backend->register_worker;
my $worker_id = $backend->register_worker($worker_id);
Register worker or send heartbeat to show that this worker is still alive.
=head2 remove_job
my $bool = $backend->remove_job($job_id);
Remove C<failed>, C<finished> or C<inactive> job from queue.
=head2 repair
$backend->repair;
Repair worker registry and job queue if necessary.
=head2 reset
$backend->reset;
Reset job queue.
=head2 retry_job
my $bool = $backend->retry_job($job_id, $retries);
my $bool = $backend->retry_job($job_id, $retries, {delay => 10});
Transition from C<failed> or C<finished> state back to C<inactive>.
These options are currently available:
=over 2
=item delay
delay => 10
Delay job for this many seconds (from now).
=item priority
priority => 5
Job priority.
=item queue
queue => 'important'
Queue to put job in.
=back
=head2 stats
my $stats = $backend->stats;
Get statistics for jobs and workers.
=head2 unregister_worker
$backend->unregister_worker($worker_id);
Unregister worker.
=head2 worker_info
my $worker_info = $backend->worker_info($worker_id);
Get information about a worker or return C<undef> if worker does not exist.
# Check worker host
my $host = $backend->worker_info($worker_id)->{host};
These fields are currently available:
=over 2
=item host
host => 'localhost'
Worker host.
=item jobs
jobs => ['10023', '10024', '10025', '10029']
Ids of jobs the worker is currently processing.
=item notified
notified => 784111777
Last time worker sent a heartbeat.
=item pid
pid => 12345
Process id of worker.
=item started
started => 784111777
Time worker was started.
=back
=head1 SEE ALSO
L<Minion>, L<Mojolicious::Guides>, L<http://mojolicio.us>.
=cut
__DATA__
@@ minion
-- 1 up
create table if not exists minion_jobs (
`id` serial not null primary key,
`args` text not null,
`created` timestamp not null,
`delayed` timestamp not null,
`finished` timestamp,
`priority` int not null,
`result` text,
`retried` timestamp,
`retries` int not null default 0,
`started` timestamp,
`state` varchar(128) not null default 'inactive',
`task` text not null,
`worker` bigint
);
create table if not exists minion_workers (
`id` serial not null primary key,
`host` text not null,
`pid` int not null,
`started` timestamp not null,
`notified` timestamp not null
);
-- 1 down
drop table if exists minion_jobs;
drop table if exists minion_workers;
-- 2 up
create index minion_jobs_state_idx on minion_jobs (state);
-- 3 up
alter table minion_jobs add queue varchar(128) not null default 'default';