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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\JobQueue;
use InvalidArgumentException;
use MediaWiki\Deferred\DeferredUpdates;
use MediaWiki\Deferred\JobQueueEnqueueUpdate;
use MediaWiki\JobQueue\Exceptions\JobQueueError;
use MediaWiki\MediaWikiServices;
use Wikimedia\MapCacheLRU\MapCacheLRU;
use Wikimedia\ObjectCache\WANObjectCache;
use Wikimedia\Rdbms\ReadOnlyMode;
use Wikimedia\Stats\StatsFactory;
use Wikimedia\UUID\GlobalIdGenerator;
/**
* Handle enqueueing of background jobs.
*
* @warning This service class supports queuing jobs to foreign wikis via JobQueueGroupFactory,
* but other operations may be called for the local wiki only. Exceptions may be thrown if you
* attempt to inspect, pop, or execute a foreign wiki's job queue.
*
* @since 1.21
* @ingroup JobQueue
*/
class JobQueueGroup {
/** @var MapCacheLRU */
protected $cache;
/** @var string Wiki domain ID */
protected $domain;
/** @var ReadOnlyMode Read only mode */
protected $readOnlyMode;
/** @var array|null */
private $localJobClasses;
/** @var array */
private $jobTypeConfiguration;
/** @var array */
private $jobTypesExcludedFromDefaultQueue;
/** @var StatsFactory */
private $statsFactory;
/** @var WANObjectCache */
private $wanCache;
/** @var GlobalIdGenerator */
private $globalIdGenerator;
/** @var array Map of (bucket => (queue => JobQueue, types => list of types) */
protected $coalescedQueues;
public const TYPE_DEFAULT = 1; // integer; jobs popped by default
private const TYPE_ANY = 2; // integer; any job
public const USE_CACHE = 1; // integer; use process or persistent cache
private const PROC_CACHE_TTL = 15; // integer; seconds
/**
* @internal Use MediaWikiServices::getJobQueueGroupFactory
*
* @param string $domain Wiki domain ID
* @param ReadOnlyMode $readOnlyMode Read-only mode
* @param array|null $localJobClasses
* @param array $jobTypeConfiguration
* @param array $jobTypesExcludedFromDefaultQueue
* @param StatsFactory $statsFactory
* @param WANObjectCache $wanCache
* @param GlobalIdGenerator $globalIdGenerator
*
*/
public function __construct(
$domain,
ReadOnlyMode $readOnlyMode,
?array $localJobClasses,
array $jobTypeConfiguration,
array $jobTypesExcludedFromDefaultQueue,
StatsFactory $statsFactory,
WANObjectCache $wanCache,
GlobalIdGenerator $globalIdGenerator
) {
$this->domain = $domain;
$this->readOnlyMode = $readOnlyMode;
$this->cache = new MapCacheLRU( 10 );
$this->localJobClasses = $localJobClasses;
$this->jobTypeConfiguration = $jobTypeConfiguration;
$this->jobTypesExcludedFromDefaultQueue = $jobTypesExcludedFromDefaultQueue;
$this->statsFactory = $statsFactory;
$this->wanCache = $wanCache;
$this->globalIdGenerator = $globalIdGenerator;
}
/**
* Get the job queue object for a given queue type
*
* @param string $type
* @return JobQueue
*/
public function get( $type ) {
$conf = [ 'domain' => $this->domain, 'type' => $type ];
$conf += $this->jobTypeConfiguration[$type] ?? $this->jobTypeConfiguration['default'];
if ( !isset( $conf['readOnlyReason'] ) ) {
$conf['readOnlyReason'] = $this->readOnlyMode->getConfiguredReason();
}
$conf['stats'] = $this->statsFactory;
$conf['wanCache'] = $this->wanCache;
$conf['idGenerator'] = $this->globalIdGenerator;
return JobQueue::factory( $conf );
}
/**
* Insert jobs into the respective queues of which they belong
*
* This inserts the jobs into the queue specified by $wgJobTypeConf
* and updates the aggregate job queue information cache as needed.
*
* @param IJobSpecification|IJobSpecification[] $jobs A single Job or a list of Jobs
* @return void
*/
public function push( $jobs ) {
$jobs = is_array( $jobs ) ? $jobs : [ $jobs ];
if ( $jobs === [] ) {
return;
}
$this->assertValidJobs( $jobs );
$jobsByType = []; // (job type => list of jobs)
foreach ( $jobs as $job ) {
$type = $job->getType();
if ( isset( $this->jobTypeConfiguration[$type] ) ) {
$jobsByType[$type][] = $job;
} else {
if (
isset( $this->jobTypeConfiguration['default']['typeAgnostic'] ) &&
$this->jobTypeConfiguration['default']['typeAgnostic']
) {
$jobsByType['default'][] = $job;
} else {
$jobsByType[$type][] = $job;
}
}
}
foreach ( $jobsByType as $type => $jobs ) {
$this->get( $type )->push( $jobs );
}
if ( $this->cache->hasField( 'queues-ready', 'list' ) ) {
$list = $this->cache->getField( 'queues-ready', 'list' );
if ( count( array_diff( array_keys( $jobsByType ), $list ) ) ) {
$this->cache->clear( 'queues-ready' );
}
}
$cache = MediaWikiServices::getInstance()->getObjectCacheFactory()->getLocalClusterInstance();
$cache->set(
$cache->makeGlobalKey( 'jobqueue', $this->domain, 'hasjobs', self::TYPE_ANY ),
'true',
15
);
if ( array_diff( array_keys( $jobsByType ), $this->jobTypesExcludedFromDefaultQueue ) ) {
$cache->set(
$cache->makeGlobalKey( 'jobqueue', $this->domain, 'hasjobs', self::TYPE_DEFAULT ),
'true',
15
);
}
}
/**
* Buffer jobs for insertion via push() or call it now if in CLI mode
*
* @param IJobSpecification|IJobSpecification[] $jobs A single Job or a list of Jobs
* @return void
* @since 1.26
*/
public function lazyPush( $jobs ) {
if ( PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg' ) {
$this->push( $jobs );
return;
}
$jobs = is_array( $jobs ) ? $jobs : [ $jobs ];
// Throw errors now instead of on push(), when other jobs may be buffered
$this->assertValidJobs( $jobs );
DeferredUpdates::addUpdate( new JobQueueEnqueueUpdate( $this->domain, $jobs ) );
}
/**
* Pop one job off a job queue
*
* @warning May not be called on foreign wikis!
*
* This pops a job off a queue as specified by $wgJobTypeConf and
* updates the aggregate job queue information cache as needed.
*
* @param int|string $qtype JobQueueGroup::TYPE_* constant or job type string
* @param int $flags Bitfield of JobQueueGroup::USE_* constants
* @param array $ignored List of job types to ignore
* @return RunnableJob|false Returns false on failure
* @throws JobQueueError
*/
public function pop( $qtype = self::TYPE_DEFAULT, $flags = 0, array $ignored = [] ) {
$job = false;
if ( !$this->localJobClasses ) {
throw new JobQueueError(
"Cannot pop '{$qtype}' job off foreign '{$this->domain}' wiki queue." );
}
if ( is_string( $qtype ) && !isset( $this->localJobClasses[$qtype] ) ) {
// Do not pop jobs if there is no class for the queue type
throw new JobQueueError( "Unrecognized job type '$qtype'." );
}
if ( is_string( $qtype ) ) { // specific job type
if ( !in_array( $qtype, $ignored ) ) {
$job = $this->get( $qtype )->pop();
}
} else { // any job in the "default" jobs types
if ( $flags & self::USE_CACHE ) {
if ( !$this->cache->hasField( 'queues-ready', 'list', self::PROC_CACHE_TTL ) ) {
$this->cache->setField( 'queues-ready', 'list', $this->getQueuesWithJobs() );
}
$types = $this->cache->getField( 'queues-ready', 'list' );
} else {
$types = $this->getQueuesWithJobs();
}
if ( $qtype == self::TYPE_DEFAULT ) {
$types = array_intersect( $types, $this->getDefaultQueueTypes() );
}
$types = array_diff( $types, $ignored ); // avoid selected types
shuffle( $types ); // avoid starvation
foreach ( $types as $type ) { // for each queue...
$job = $this->get( $type )->pop();
if ( $job ) { // found
break;
} else { // not found
$this->cache->clear( 'queues-ready' );
}
}
}
return $job;
}
/**
* Acknowledge that a job was completed
*
* @param RunnableJob $job
* @return void
*/
public function ack( RunnableJob $job ) {
$this->get( $job->getType() )->ack( $job );
}
/**
* Register the "root job" of a given job into the queue for de-duplication.
* This should only be called right *after* all the new jobs have been inserted.
*
* @deprecated since 1.40
* @param RunnableJob $job
* @return bool
*/
public function deduplicateRootJob( RunnableJob $job ) {
wfDeprecated( __METHOD__, '1.40' );
return true;
}
/**
* Wait for any replica DBs or backup queue servers to catch up.
*
* This does nothing for certain queue classes.
*
* @deprecated since 1.41, use JobQueue::waitForBackups() instead.
*
* @return void
*/
public function waitForBackups() {
wfDeprecated( __METHOD__, '1.41' );
// Try to avoid doing this more than once per queue storage medium
foreach ( $this->jobTypeConfiguration as $type => $conf ) {
$this->get( $type )->waitForBackups();
}
}
/**
* Get the list of queue types
*
* @warning May not be called on foreign wikis!
*
* @return string[]
*/
public function getQueueTypes() {
if ( !$this->localJobClasses ) {
throw new JobQueueError( 'Cannot inspect job queue from foreign wiki' );
}
return array_keys( $this->localJobClasses );
}
/**
* Get the list of default queue types
*
* @warning May not be called on foreign wikis!
*
* @return string[]
*/
public function getDefaultQueueTypes() {
return array_diff( $this->getQueueTypes(), $this->jobTypesExcludedFromDefaultQueue );
}
/**
* Check if there are any queues with jobs (this is cached)
*
* @warning May not be called on foreign wikis!
*
* @since 1.23
* @param int $type JobQueueGroup::TYPE_* constant
* @return bool
*/
public function queuesHaveJobs( $type = self::TYPE_ANY ) {
$cache = MediaWikiServices::getInstance()->getObjectCacheFactory()->getLocalClusterInstance();
$key = $cache->makeGlobalKey( 'jobqueue', $this->domain, 'hasjobs', $type );
$value = $cache->get( $key );
if ( $value === false ) {
$queues = $this->getQueuesWithJobs();
if ( $type == self::TYPE_DEFAULT ) {
$queues = array_intersect( $queues, $this->getDefaultQueueTypes() );
}
$value = count( $queues ) ? 'true' : 'false';
$cache->add( $key, $value, 15 );
}
return ( $value === 'true' );
}
/**
* Get the list of job types that have non-empty queues
*
* @warning May not be called on foreign wikis!
*
* @return string[] List of job types that have non-empty queues
*/
public function getQueuesWithJobs() {
$types = [];
foreach ( $this->getCoalescedQueues() as $info ) {
/** @var JobQueue $queue */
$queue = $info['queue'];
$nonEmpty = $queue->getSiblingQueuesWithJobs( $this->getQueueTypes() );
if ( is_array( $nonEmpty ) ) { // batching features supported
$types = array_merge( $types, $nonEmpty );
} else { // we have to go through the queues in the bucket one-by-one
foreach ( $info['types'] as $type ) {
if ( !$this->get( $type )->isEmpty() ) {
$types[] = $type;
}
}
}
}
return $types;
}
/**
* Get the size of the queues for a list of job types
*
* @warning May not be called on foreign wikis!
*
* @return int[] Map of (job type => size)
*/
public function getQueueSizes() {
$sizeMap = [];
foreach ( $this->getCoalescedQueues() as $info ) {
/** @var JobQueue $queue */
$queue = $info['queue'];
$sizes = $queue->getSiblingQueueSizes( $this->getQueueTypes() );
if ( is_array( $sizes ) ) { // batching features supported
$sizeMap += $sizes;
} else { // we have to go through the queues in the bucket one-by-one
foreach ( $info['types'] as $type ) {
$sizeMap[$type] = $this->get( $type )->getSize();
}
}
}
return $sizeMap;
}
/**
* @return array[]
* @phan-return array<string,array{queue:JobQueue,types:array<string,class-string>}>
*/
protected function getCoalescedQueues() {
if ( $this->coalescedQueues === null ) {
$this->coalescedQueues = [];
foreach ( $this->jobTypeConfiguration as $type => $conf ) {
$conf['domain'] = $this->domain;
$conf['type'] = 'null';
$conf['stats'] = $this->statsFactory;
$conf['wanCache'] = $this->wanCache;
$conf['idGenerator'] = $this->globalIdGenerator;
$queue = JobQueue::factory( $conf );
$loc = $queue->getCoalesceLocationInternal();
if ( !isset( $this->coalescedQueues[$loc] ) ) {
$this->coalescedQueues[$loc]['queue'] = $queue;
$this->coalescedQueues[$loc]['types'] = [];
}
if ( $type === 'default' ) {
$this->coalescedQueues[$loc]['types'] = array_merge(
$this->coalescedQueues[$loc]['types'],
array_diff( $this->getQueueTypes(), array_keys( $this->jobTypeConfiguration ) )
);
} else {
$this->coalescedQueues[$loc]['types'][] = $type;
}
}
}
return $this->coalescedQueues;
}
private function assertValidJobs( array $jobs ) {
foreach ( $jobs as $job ) {
if ( !( $job instanceof IJobSpecification ) ) {
$type = get_debug_type( $job );
throw new InvalidArgumentException( "Expected IJobSpecification objects, got " . $type );
}
}
}
}
/** @deprecated class alias since 1.44 */
class_alias( JobQueueGroup::class, 'JobQueueGroup' );