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+<?php
+/**
+ * Job queue base code.
+ *
+ * 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
+ * @author Aaron Schulz
+ */
+
+/**
+ * Class to handle enqueueing of background jobs
+ *
+ * @ingroup JobQueue
+ * @since 1.21
+ */
+class JobQueueGroup {
+ /** @var array */
+ protected static $instances = array();
+
+ /** @var ProcessCacheLRU */
+ protected $cache;
+
+ /** @var string Wiki ID */
+ protected $wiki;
+
+ /** @var array Map of (bucket => (queue => JobQueue, types => list of types) */
+ protected $coalescedQueues;
+
+ const TYPE_DEFAULT = 1; // integer; jobs popped by default
+ const TYPE_ANY = 2; // integer; any job
+
+ const USE_CACHE = 1; // integer; use process or persistent cache
+
+ const PROC_CACHE_TTL = 15; // integer; seconds
+
+ const CACHE_VERSION = 1; // integer; cache version
+
+ /**
+ * @param string $wiki Wiki ID
+ */
+ protected function __construct( $wiki ) {
+ $this->wiki = $wiki;
+ $this->cache = new ProcessCacheLRU( 10 );
+ }
+
+ /**
+ * @param bool|string $wiki Wiki ID
+ * @return JobQueueGroup
+ */
+ public static function singleton( $wiki = false ) {
+ $wiki = ( $wiki === false ) ? wfWikiID() : $wiki;
+ if ( !isset( self::$instances[$wiki] ) ) {
+ self::$instances[$wiki] = new self( $wiki );
+ }
+
+ return self::$instances[$wiki];
+ }
+
+ /**
+ * Destroy the singleton instances
+ *
+ * @return void
+ */
+ public static function destroySingletons() {
+ self::$instances = array();
+ }
+
+ /**
+ * Get the job queue object for a given queue type
+ *
+ * @param string $type
+ * @return JobQueue
+ */
+ public function get( $type ) {
+ global $wgJobTypeConf;
+
+ $conf = array( 'wiki' => $this->wiki, 'type' => $type );
+ if ( isset( $wgJobTypeConf[$type] ) ) {
+ $conf = $conf + $wgJobTypeConf[$type];
+ } else {
+ $conf = $conf + $wgJobTypeConf['default'];
+ }
+
+ return JobQueue::factory( $conf );
+ }
+
+ /**
+ * Insert jobs into the respective queues of with the belong.
+ *
+ * This inserts the jobs into the queue specified by $wgJobTypeConf
+ * and updates the aggregate job queue information cache as needed.
+ *
+ * @param Job|array $jobs A single Job or a list of Jobs
+ * @throws MWException
+ * @return void
+ */
+ public function push( $jobs ) {
+ $jobs = is_array( $jobs ) ? $jobs : array( $jobs );
+ if ( !count( $jobs ) ) {
+ return;
+ }
+
+ $jobsByType = array(); // (job type => list of jobs)
+ foreach ( $jobs as $job ) {
+ if ( $job instanceof IJobSpecification ) {
+ $jobsByType[$job->getType()][] = $job;
+ } else {
+ throw new MWException( "Attempted to push a non-Job object into a queue." );
+ }
+ }
+
+ foreach ( $jobsByType as $type => $jobs ) {
+ $this->get( $type )->push( $jobs );
+ JobQueueAggregator::singleton()->notifyQueueNonEmpty( $this->wiki, $type );
+ }
+
+ if ( $this->cache->has( 'queues-ready', 'list' ) ) {
+ $list = $this->cache->get( 'queues-ready', 'list' );
+ if ( count( array_diff( array_keys( $jobsByType ), $list ) ) ) {
+ $this->cache->clear( 'queues-ready' );
+ }
+ }
+ }
+
+ /**
+ * Pop a job off one of the job queues
+ *
+ * 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 $blacklist List of job types to ignore
+ * @return Job|bool Returns false on failure
+ */
+ public function pop( $qtype = self::TYPE_DEFAULT, $flags = 0, array $blacklist = array() ) {
+ $job = false;
+
+ if ( is_string( $qtype ) ) { // specific job type
+ if ( !in_array( $qtype, $blacklist ) ) {
+ $job = $this->get( $qtype )->pop();
+ if ( !$job ) {
+ JobQueueAggregator::singleton()->notifyQueueEmpty( $this->wiki, $qtype );
+ }
+ }
+ } else { // any job in the "default" jobs types
+ if ( $flags & self::USE_CACHE ) {
+ if ( !$this->cache->has( 'queues-ready', 'list', self::PROC_CACHE_TTL ) ) {
+ $this->cache->set( 'queues-ready', 'list', $this->getQueuesWithJobs() );
+ }
+ $types = $this->cache->get( 'queues-ready', 'list' );
+ } else {
+ $types = $this->getQueuesWithJobs();
+ }
+
+ if ( $qtype == self::TYPE_DEFAULT ) {
+ $types = array_intersect( $types, $this->getDefaultQueueTypes() );
+ }
+
+ $types = array_diff( $types, $blacklist ); // 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
+ JobQueueAggregator::singleton()->notifyQueueEmpty( $this->wiki, $type );
+ $this->cache->clear( 'queues-ready' );
+ }
+ }
+ }
+
+ return $job;
+ }
+
+ /**
+ * Acknowledge that a job was completed
+ *
+ * @param Job $job
+ * @return bool
+ */
+ public function ack( Job $job ) {
+ return $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.
+ *
+ * @param Job $job
+ * @return bool
+ */
+ public function deduplicateRootJob( Job $job ) {
+ return $this->get( $job->getType() )->deduplicateRootJob( $job );
+ }
+
+ /**
+ * Wait for any slaves or backup queue servers to catch up.
+ *
+ * This does nothing for certain queue classes.
+ *
+ * @return void
+ * @throws MWException
+ */
+ public function waitForBackups() {
+ global $wgJobTypeConf;
+
+ wfProfileIn( __METHOD__ );
+ // Try to avoid doing this more than once per queue storage medium
+ foreach ( $wgJobTypeConf as $type => $conf ) {
+ $this->get( $type )->waitForBackups();
+ }
+ wfProfileOut( __METHOD__ );
+ }
+
+ /**
+ * Get the list of queue types
+ *
+ * @return array List of strings
+ */
+ public function getQueueTypes() {
+ return array_keys( $this->getCachedConfigVar( 'wgJobClasses' ) );
+ }
+
+ /**
+ * Get the list of default queue types
+ *
+ * @return array List of strings
+ */
+ public function getDefaultQueueTypes() {
+ global $wgJobTypesExcludedFromDefaultQueue;
+
+ return array_diff( $this->getQueueTypes(), $wgJobTypesExcludedFromDefaultQueue );
+ }
+
+ /**
+ * Check if there are any queues with jobs (this is cached)
+ *
+ * @param int $type JobQueueGroup::TYPE_* constant
+ * @return bool
+ * @since 1.23
+ */
+ public function queuesHaveJobs( $type = self::TYPE_ANY ) {
+ global $wgMemc;
+
+ $key = wfMemcKey( 'jobqueue', 'queueshavejobs', $type );
+
+ $value = $wgMemc->get( $key );
+ if ( $value === false ) {
+ $queues = $this->getQueuesWithJobs();
+ if ( $type == self::TYPE_DEFAULT ) {
+ $queues = array_intersect( $queues, $this->getDefaultQueueTypes() );
+ }
+ $value = count( $queues ) ? 'true' : 'false';
+ $wgMemc->add( $key, $value, 15 );
+ }
+
+ return ( $value === 'true' );
+ }
+
+ /**
+ * Get the list of job types that have non-empty queues
+ *
+ * @return array List of job types that have non-empty queues
+ */
+ public function getQueuesWithJobs() {
+ $types = array();
+ foreach ( $this->getCoalescedQueues() as $info ) {
+ $nonEmpty = $info['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 queus for a list of job types
+ *
+ * @return array Map of (job type => size)
+ */
+ public function getQueueSizes() {
+ $sizeMap = array();
+ foreach ( $this->getCoalescedQueues() as $info ) {
+ $sizes = $info['queue']->getSiblingQueueSizes( $this->getQueueTypes() );
+ if ( is_array( $sizes ) ) { // batching features supported
+ $sizeMap = $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
+ */
+ protected function getCoalescedQueues() {
+ global $wgJobTypeConf;
+
+ if ( $this->coalescedQueues === null ) {
+ $this->coalescedQueues = array();
+ foreach ( $wgJobTypeConf as $type => $conf ) {
+ $queue = JobQueue::factory(
+ array( 'wiki' => $this->wiki, 'type' => 'null' ) + $conf );
+ $loc = $queue->getCoalesceLocationInternal();
+ if ( !isset( $this->coalescedQueues[$loc] ) ) {
+ $this->coalescedQueues[$loc]['queue'] = $queue;
+ $this->coalescedQueues[$loc]['types'] = array();
+ }
+ if ( $type === 'default' ) {
+ $this->coalescedQueues[$loc]['types'] = array_merge(
+ $this->coalescedQueues[$loc]['types'],
+ array_diff( $this->getQueueTypes(), array_keys( $wgJobTypeConf ) )
+ );
+ } else {
+ $this->coalescedQueues[$loc]['types'][] = $type;
+ }
+ }
+ }
+
+ return $this->coalescedQueues;
+ }
+
+ /**
+ * Execute any due periodic queue maintenance tasks for all queues.
+ *
+ * A task is "due" if the time ellapsed since the last run is greater than
+ * the defined run period. Concurrent calls to this function will cause tasks
+ * to be attempted twice, so they may need their own methods of mutual exclusion.
+ *
+ * @return int Number of tasks run
+ */
+ public function executeReadyPeriodicTasks() {
+ global $wgMemc;
+
+ list( $db, $prefix ) = wfSplitWikiID( $this->wiki );
+ $key = wfForeignMemcKey( $db, $prefix, 'jobqueuegroup', 'taskruns', 'v1' );
+ $lastRuns = $wgMemc->get( $key ); // (queue => task => UNIX timestamp)
+
+ $count = 0;
+ $tasksRun = array(); // (queue => task => UNIX timestamp)
+ foreach ( $this->getQueueTypes() as $type ) {
+ $queue = $this->get( $type );
+ foreach ( $queue->getPeriodicTasks() as $task => $definition ) {
+ if ( $definition['period'] <= 0 ) {
+ continue; // disabled
+ } elseif ( !isset( $lastRuns[$type][$task] )
+ || $lastRuns[$type][$task] < ( time() - $definition['period'] )
+ ) {
+ try {
+ if ( call_user_func( $definition['callback'] ) !== null ) {
+ $tasksRun[$type][$task] = time();
+ ++$count;
+ }
+ } catch ( JobQueueError $e ) {
+ MWExceptionHandler::logException( $e );
+ }
+ }
+ }
+ // The tasks may have recycled jobs or release delayed jobs into the queue
+ if ( isset( $tasksRun[$type] ) && !$queue->isEmpty() ) {
+ JobQueueAggregator::singleton()->notifyQueueNonEmpty( $this->wiki, $type );
+ }
+ }
+
+ if ( $count === 0 ) {
+ return $count; // nothing to update
+ }
+
+ $wgMemc->merge( $key, function ( $cache, $key, $lastRuns ) use ( $tasksRun ) {
+ if ( is_array( $lastRuns ) ) {
+ foreach ( $tasksRun as $type => $tasks ) {
+ foreach ( $tasks as $task => $timestamp ) {
+ if ( !isset( $lastRuns[$type][$task] )
+ || $timestamp > $lastRuns[$type][$task]
+ ) {
+ $lastRuns[$type][$task] = $timestamp;
+ }
+ }
+ }
+ } else {
+ $lastRuns = $tasksRun;
+ }
+
+ return $lastRuns;
+ } );
+
+ return $count;
+ }
+
+ /**
+ * @param string $name
+ * @return mixed
+ */
+ private function getCachedConfigVar( $name ) {
+ global $wgConf, $wgMemc;
+
+ if ( $this->wiki === wfWikiID() ) {
+ return $GLOBALS[$name]; // common case
+ } else {
+ list( $db, $prefix ) = wfSplitWikiID( $this->wiki );
+ $key = wfForeignMemcKey( $db, $prefix, 'configvalue', $name );
+ $value = $wgMemc->get( $key ); // ('v' => ...) or false
+ if ( is_array( $value ) ) {
+ return $value['v'];
+ } else {
+ $value = $wgConf->getConfig( $this->wiki, $name );
+ $wgMemc->set( $key, array( 'v' => $value ), 86400 + mt_rand( 0, 86400 ) );
+
+ return $value;
+ }
+ }
+ }
+}
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