Provided by: libminion-perl_10.04+dfsg-1_all 
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 with or without a result, 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 with or without a result.
history
my $history = $backend->history;
Get history information for job queue.
These fields are currently available:
daily
daily => [{epoch => 12345, finished_jobs => 95, failed_jobs => 2}, ...]
Hourly counts for processed jobs from the past day.
list_jobs
my $results = $backend->list_jobs($offset, $limit);
my $results = $backend->list_jobs($offset, $limit, {states => ['inactive']});
Returns the information about jobs in batches.
# Get the total number of results (without limit)
my $num = $backend->list_jobs(0, 100, {queues => ['important']})->{total};
# Check job state
my $results = $backend->list_jobs(0, 1, {ids => [$job_id]});
my $state = $results->{jobs}[0]{state};
# Get job result
my $results = $backend->list_jobs(0, 1, {ids => [$job_id]});
my $result = $results->{jobs}[0]{result};
These options are currently available:
before
before => 23
List only jobs before this id. Note that this option is EXPERIMENTAL and might change without warning!
ids
ids => ['23', '24']
List only jobs with these ids.
notes
notes => ['foo', 'bar']
List only jobs with one of these notes. Note that this option is EXPERIMENTAL and might change without
warning!
queues
queues => ['important', 'unimportant']
List only jobs in these queues.
states
states => ['inactive', 'active']
List only jobs in these states.
tasks
tasks => ['foo', 'bar']
List only jobs for these tasks.
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.
id
id => 10025
Job id.
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.
time
time => 78411177
Server time.
worker
worker => '154'
Id of worker that is processing the job.
list_locks
my $results = $backend->list_locks($offset, $limit);
my $results = $backend->list_locks($offset, $limit, {names => ['foo']});
Returns information about locks in batches.
# Get the total number of results (without limit)
my $num = $backend->list_locks(0, 100, {names => ['bar']})->{total};
# Check expiration time
my $results = $backend->list_locks(0, 1, {names => ['foo']});
my $expires = $results->{locks}[0]{expires};
These options are currently available:
names
names => ['foo', 'bar']
List only locks with these names.
These fields are currently available:
expires
expires => 784111777
Epoch time this lock will expire.
name
name => 'foo'
Lock name.
list_workers
my $results = $backend->list_workers($offset, $limit);
my $results = $backend->list_workers($offset, $limit, {ids => [23]});
Returns information about workers in batches.
# Get the total number of results (without limit)
my $num = $backend->list_workers(0, 100)->{total};
# Check worker host
my $results = $backend->list_workers(0, 1, {ids => [$worker_id]});
my $host = $results->{workers}[0]{host};
These options are currently available:
before
before => 23
List only workers before this id. Note that this option is EXPERIMENTAL and might change without
warning!
ids
ids => ['23', '24']
List only workers with these ids.
These fields are currently available:
id
id => 22
Worker id.
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.
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. An
expiration time of 0 can be used to check if a named lock already exists without creating one.
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, {mojo => 'rocks', minion => 'too'});
Change one or more metadata fields for a job. Setting a value to "undef" will remove the field.
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']}});
Register worker or send heartbeat to show that this worker is still alive.
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({all => 1});
Reset job queue.
These options are currently available:
all
all => 1
Reset everything.
locks
locks => 1
Reset only locks.
retry_job
my $bool = $backend->retry_job($job_id, $retries);
my $bool = $backend->retry_job($job_id, $retries, {delay => 10});
Transition job back to "inactive" state, already "inactive" jobs may also be retried to change options.
These options are currently available:
attempts
attempts => 25
Number of times performing this job will be attempted.
delay
delay => 10
Delay job for this many seconds (from now), defaults to 0.
parents
parents => [$id1, $id2, $id3]
Jobs this job depends on.
priority
priority => 5
Job priority.
queue
queue => 'important'
Queue to put job in.
stats
my $stats = $backend->stats;
Get statistics for the job queue.
These fields are currently available:
active_jobs
active_jobs => 100
Number of jobs in "active" state.
active_locks
active_locks => 100
Number of active named locks.
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.
enqueued_jobs
enqueued_jobs => 100000
Rough estimate of how many jobs have ever been enqueued.
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.
uptime
uptime => 1000
Uptime in seconds.
unlock
my $bool = $backend->unlock('foo');
Release a named lock.
unregister_worker
$backend->unregister_worker($worker_id);
Unregister worker.
SEE ALSO
Minion, Mojolicious::Guides, <https://mojolicious.org>.
perl v5.30.0 2020-01-31 Minion::Backend::Pg(3pm)