NAME

Minion::Backend::Pg - PostgreSQL backend

SYNOPSIS

use Minion::Backend::Pg;

my $backend = Minion::Backend::Pg->new('postgresql://postgres@/test');

DESCRIPTION

Minion::Backend::Pg is a backend for Minion based on Mojo::Pg. All necessary tables will be created automatically with a set of migrations named minion. Note that this backend uses many bleeding edge features, so only the latest, stable version of PostgreSQL is fully supported.

ATTRIBUTES

Minion::Backend::Pg inherits all attributes from Minion::Backend and implements the following new ones.

pg

my $pg   = $backend->pg;
$backend = $backend->pg(Mojo::Pg->new);

Mojo::Pg object used to store all data.

METHODS

Minion::Backend::Pg inherits all methods from Minion::Backend and implements the following new ones.

broadcast

my $bool = $backend->broadcast('some_command');
my $bool = $backend->broadcast('some_command', [@args]);
my $bool = $backend->broadcast('some_command', [@args], [$id1, $id2, $id3]);

Broadcast remote control command to one or more workers.

dequeue

my $job_info = $backend->dequeue($worker_id, 0.5);
my $job_info = $backend->dequeue($worker_id, 0.5, {queues => ['important']});

Wait a given amount of time in seconds for a job, dequeue it and transition from inactive to active state, or return undef if queues were empty.

These options are currently available:

id

id => '10023'

Dequeue a specific job.

queues

queues => ['important']

One or more queues to dequeue jobs from, defaults to default.

These fields are currently available:

args

args => ['foo', 'bar']

Job arguments.

id

id => '10023'

Job ID.

retries

retries => 3

Number of times job has been retried.

task

task => 'foo'

Task name.

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 inactive state.

These options are currently available:

attempts

attempts => 25

Number of times performing this job will be attempted, with a delay based on "backoff" in Minion after the first attempt, defaults to 1.

delay

delay => 10

Delay job for this many seconds (from now), defaults to 0.

notes

notes => {foo => 'bar', baz => [1, 2, 3]}

Hash reference with arbitrary metadata for this job.

parents

parents => [$id1, $id2, $id3]

One or more existing jobs this job depends on, and that need to have transitioned to the state finished before it can be processed.

priority

priority => 5

Job priority, defaults to 0. Jobs with a higher priority get performed first.

queue

queue => 'important'

Queue to put job in, defaults to default.

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, {whatever => 'Something went wrong!'});

Transition from active to failed state, and if there are attempts remaining, transition back to inactive with a delay based on "backoff" in Minion.

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, {whatever => 'All went well!'});

Transition from active to finished state.

job_info

my $job_info = $backend->job_info($job_id);

Get information about a job, or return 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:

args

args => ['foo', 'bar']

Job arguments.

attempts

attempts => 25

Number of times performing this job will be attempted.

children

children => ['10026', '10027', '10028']

Jobs depending on this job.

created

created => 784111777

Epoch time job was created.

delayed

delayed => 784111777

Epoch time job was delayed to.

finished

finished => 784111777

Epoch time job was finished.

notes

notes => {foo => 'bar', baz => [1, 2, 3]}

Hash reference with arbitrary metadata for this job.

parents

parents => ['10023', '10024', '10025']

Jobs this job depends on.

priority

priority => 3

Job priority.

queue

queue => 'important'

Queue name.

result

result => 'All went well!'

Job result.

retried

retried => 784111777

Epoch time job has been retried.

retries

retries => 3

Number of times job has been retried.

started

started => 784111777

Epoch time job was started.

state

state => 'inactive'

Current job state, usually active, failed, finished or inactive.

task

task => 'foo'

Task name.

worker

worker => '154'

Id of worker that is processing the job.

list_jobs

my $batch = $backend->list_jobs($offset, $limit);
my $batch = $backend->list_jobs($offset, $limit, {state => 'inactive'});

Returns the same information as "job_info" but in batches.

These options are currently available:

queue

queue => 'important'

List only jobs in this queue.

state

state => 'inactive'

List only jobs in this state.

task

task => 'test'

List only jobs for this task.

list_workers

my $batch = $backend->list_workers($offset, $limit);

Returns the same information as "worker_info" but in batches.

lock

my $bool = $backend->lock('foo', 3600);
my $bool = $backend->lock('foo', 3600, {limit => 20});

Try to acquire a named lock that will expire automatically after the given amount of time in seconds.

These options are currently available:

limit

limit => 20

Number of shared locks with the same name that can be active at the same time, defaults to 1.

new

my $backend = Minion::Backend::Pg->new('postgresql://postgres@/test');
my $backend = Minion::Backend::Pg->new(Mojo::Pg->new);

Construct a new Minion::Backend::Pg object.

note

my $bool = $backend->note($job_id, foo => 'bar');

Change a metadata field for a job.

receive

my $commands = $backend->receive($worker_id);

Receive remote control commands for worker.

register_worker

my $worker_id = $backend->register_worker;
my $worker_id = $backend->register_worker($worker_id);
my $worker_id = $backend->register_worker(
  $worker_id, {status => {queues => ['default', 'important']}});

These options are currently available:

status

status => {queues => ['default', 'important']}

Hash reference with whatever status information the worker would like to share.

remove_job

my $bool = $backend->remove_job($job_id);

Remove failed, finished or inactive job from queue.

repair

$backend->repair;

Repair worker registry and job queue if necessary.

reset

$backend->reset;

Reset job queue.

retry_job

my $bool = $backend->retry_job($job_id, $retries);
my $bool = $backend->retry_job($job_id, $retries, {delay => 10});

Transition job back to inactive state, already inactive jobs may also be retried to change options.

These options are currently available:

attempts

attempts => 25

Number of times performing this job will be attempted.

delay

delay => 10

Delay job for this many seconds (from now), defaults to 0.

priority

priority => 5

Job priority.

queue

queue => 'important'

Queue to put job in.

stats

my $stats = $backend->stats;

Get statistics for jobs and workers.

These fields are currently available:

active_jobs

active_jobs => 100

Number of jobs in active state.

active_workers

active_workers => 100

Number of workers that are currently processing a job.

delayed_jobs

delayed_jobs => 100

Number of jobs in inactive state that are scheduled to run at specific time in the future or have unresolved dependencies. Note that this field is EXPERIMENTAL and might change without warning!

enqueued_jobs

enqueued_jobs => 100000

Rough estimate of how many jobs have ever been enqueued. Note that this field is EXPERIMENTAL and might change without warning!

failed_jobs

failed_jobs => 100

Number of jobs in failed state.

finished_jobs

finished_jobs => 100

Number of jobs in finished state.

inactive_jobs

inactive_jobs => 100

Number of jobs in inactive state.

inactive_workers

inactive_workers => 100

Number of workers that are currently not processing a job.

unlock

my $bool = $backend->unlock('foo');

Release a named lock.

unregister_worker

$backend->unregister_worker($worker_id);

Unregister worker.

worker_info

my $worker_info = $backend->worker_info($worker_id);

Get information about a worker, or return undef if worker does not exist.

# Check worker host
my $host = $backend->worker_info($worker_id)->{host};

These fields are currently available:

host

host => 'localhost'

Worker host.

jobs

jobs => ['10023', '10024', '10025', '10029']

Ids of jobs the worker is currently processing.

notified

notified => 784111777

Epoch time worker sent the last heartbeat.

pid

pid => 12345

Process id of worker.

started

started => 784111777

Epoch time worker was started.

status

status => {queues => ['default', 'important']}

Hash reference with whatever status information the worker would like to share.

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NAME

SYNOPSIS

DESCRIPTION

ATTRIBUTES

pg

METHODS

broadcast

dequeue

enqueue

fail_job

finish_job

job_info

list_jobs

list_workers

lock

new

note

receive

register_worker

remove_job

repair

reset

retry_job

stats

unlock

unregister_worker

worker_info

SEE ALSO

Module Install Instructions