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+<?php
+/**
+ * Redis-backed job queue 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 job queues stored in Redis
+ *
+ * This is faster, less resource intensive, queue that JobQueueDB.
+ * All data for a queue using this class is placed into one redis server.
+ *
+ * There are eight main redis keys used to track jobs:
+ * - l-unclaimed : A list of job IDs used for ready unclaimed jobs
+ * - z-claimed : A sorted set of (job ID, UNIX timestamp as score) used for job retries
+ * - z-abandoned : A sorted set of (job ID, UNIX timestamp as score) used for broken jobs
+ * - z-delayed : A sorted set of (job ID, UNIX timestamp as score) used for delayed jobs
+ * - h-idBySha1 : A hash of (SHA1 => job ID) for unclaimed jobs used for de-duplication
+ * - h-sha1ById : A hash of (job ID => SHA1) for unclaimed jobs used for de-duplication
+ * - h-attempts : A hash of (job ID => attempt count) used for job claiming/retries
+ * - h-data : A hash of (job ID => serialized blobs) for job storage
+ * A job ID can be in only one of z-delayed, l-unclaimed, z-claimed, and z-abandoned.
+ * If an ID appears in any of those lists, it should have a h-data entry for its ID.
+ * If a job has a SHA1 de-duplication value and its ID is in l-unclaimed or z-delayed, then
+ * there should be no other such jobs with that SHA1. Every h-idBySha1 entry has an h-sha1ById
+ * entry and every h-sha1ById must refer to an ID that is l-unclaimed. If a job has its
+ * ID in z-claimed or z-abandoned, then it must also have an h-attempts entry for its ID.
+ *
+ * Additionally, "rootjob:* keys track "root jobs" used for additional de-duplication.
+ * Aside from root job keys, all keys have no expiry, and are only removed when jobs are run.
+ * All the keys are prefixed with the relevant wiki ID information.
+ *
+ * This class requires Redis 2.6 as it makes use Lua scripts for fast atomic operations.
+ * Additionally, it should be noted that redis has different persistence modes, such
+ * as rdb snapshots, journaling, and no persistent. Appropriate configuration should be
+ * made on the servers based on what queues are using it and what tolerance they have.
+ *
+ * @ingroup JobQueue
+ * @ingroup Redis
+ * @since 1.22
+ */
+class JobQueueRedis extends JobQueue {
+ /** @var RedisConnectionPool */
+ protected $redisPool;
+
+ /** @var string Server address */
+ protected $server;
+ /** @var string Compression method to use */
+ protected $compression;
+ /** @var bool */
+ protected $daemonized;
+
+ const MAX_AGE_PRUNE = 604800; // integer; seconds a job can live once claimed (7 days)
+
+ /** @var string Key to prefix the queue keys with (used for testing) */
+ protected $key;
+
+ /**
+ * @param array $params Possible keys:
+ * - redisConfig : An array of parameters to RedisConnectionPool::__construct().
+ * Note that the serializer option is ignored as "none" is always used.
+ * - redisServer : A hostname/port combination or the absolute path of a UNIX socket.
+ * If a hostname is specified but no port, the standard port number
+ * 6379 will be used. Required.
+ * - compression : The type of compression to use; one of (none,gzip).
+ * - daemonized : Set to true if the redisJobRunnerService runs in the background.
+ * This will disable job recycling/undelaying from the MediaWiki side
+ * to avoid redundance and out-of-sync configuration.
+ */
+ public function __construct( array $params ) {
+ parent::__construct( $params );
+ $params['redisConfig']['serializer'] = 'none'; // make it easy to use Lua
+ $this->server = $params['redisServer'];
+ $this->compression = isset( $params['compression'] ) ? $params['compression'] : 'none';
+ $this->redisPool = RedisConnectionPool::singleton( $params['redisConfig'] );
+ $this->daemonized = !empty( $params['daemonized'] );
+ }
+
+ protected function supportedOrders() {
+ return array( 'timestamp', 'fifo' );
+ }
+
+ protected function optimalOrder() {
+ return 'fifo';
+ }
+
+ protected function supportsDelayedJobs() {
+ return true;
+ }
+
+ /**
+ * @see JobQueue::doIsEmpty()
+ * @return bool
+ * @throws MWException
+ */
+ protected function doIsEmpty() {
+ return $this->doGetSize() == 0;
+ }
+
+ /**
+ * @see JobQueue::doGetSize()
+ * @return int
+ * @throws MWException
+ */
+ protected function doGetSize() {
+ $conn = $this->getConnection();
+ try {
+ return $conn->lSize( $this->getQueueKey( 'l-unclaimed' ) );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::doGetAcquiredCount()
+ * @return int
+ * @throws JobQueueError
+ */
+ protected function doGetAcquiredCount() {
+ if ( $this->claimTTL <= 0 ) {
+ return 0; // no acknowledgements
+ }
+ $conn = $this->getConnection();
+ try {
+ $conn->multi( Redis::PIPELINE );
+ $conn->zSize( $this->getQueueKey( 'z-claimed' ) );
+ $conn->zSize( $this->getQueueKey( 'z-abandoned' ) );
+
+ return array_sum( $conn->exec() );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::doGetDelayedCount()
+ * @return int
+ * @throws JobQueueError
+ */
+ protected function doGetDelayedCount() {
+ if ( !$this->checkDelay ) {
+ return 0; // no delayed jobs
+ }
+ $conn = $this->getConnection();
+ try {
+ return $conn->zSize( $this->getQueueKey( 'z-delayed' ) );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::doGetAbandonedCount()
+ * @return int
+ * @throws JobQueueError
+ */
+ protected function doGetAbandonedCount() {
+ if ( $this->claimTTL <= 0 ) {
+ return 0; // no acknowledgements
+ }
+ $conn = $this->getConnection();
+ try {
+ return $conn->zSize( $this->getQueueKey( 'z-abandoned' ) );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::doBatchPush()
+ * @param array $jobs
+ * @param int $flags
+ * @return void
+ * @throws JobQueueError
+ */
+ protected function doBatchPush( array $jobs, $flags ) {
+ // Convert the jobs into field maps (de-duplicated against each other)
+ $items = array(); // (job ID => job fields map)
+ foreach ( $jobs as $job ) {
+ $item = $this->getNewJobFields( $job );
+ if ( strlen( $item['sha1'] ) ) { // hash identifier => de-duplicate
+ $items[$item['sha1']] = $item;
+ } else {
+ $items[$item['uuid']] = $item;
+ }
+ }
+
+ if ( !count( $items ) ) {
+ return; // nothing to do
+ }
+
+ $conn = $this->getConnection();
+ try {
+ // Actually push the non-duplicate jobs into the queue...
+ if ( $flags & self::QOS_ATOMIC ) {
+ $batches = array( $items ); // all or nothing
+ } else {
+ $batches = array_chunk( $items, 500 ); // avoid tying up the server
+ }
+ $failed = 0;
+ $pushed = 0;
+ foreach ( $batches as $itemBatch ) {
+ $added = $this->pushBlobs( $conn, $itemBatch );
+ if ( is_int( $added ) ) {
+ $pushed += $added;
+ } else {
+ $failed += count( $itemBatch );
+ }
+ }
+ if ( $failed > 0 ) {
+ wfDebugLog( 'JobQueueRedis', "Could not insert {$failed} {$this->type} job(s)." );
+
+ throw new RedisException( "Could not insert {$failed} {$this->type} job(s)." );
+ }
+ JobQueue::incrStats( 'job-insert', $this->type, count( $items ), $this->wiki );
+ JobQueue::incrStats( 'job-insert-duplicate', $this->type,
+ count( $items ) - $failed - $pushed, $this->wiki );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @param RedisConnRef $conn
+ * @param array $items List of results from JobQueueRedis::getNewJobFields()
+ * @return int Number of jobs inserted (duplicates are ignored)
+ * @throws RedisException
+ */
+ protected function pushBlobs( RedisConnRef $conn, array $items ) {
+ $args = array(); // ([id, sha1, rtime, blob [, id, sha1, rtime, blob ... ] ] )
+ foreach ( $items as $item ) {
+ $args[] = (string)$item['uuid'];
+ $args[] = (string)$item['sha1'];
+ $args[] = (string)$item['rtimestamp'];
+ $args[] = (string)$this->serialize( $item );
+ }
+ static $script =
+<<<LUA
+ local kUnclaimed, kSha1ById, kIdBySha1, kDelayed, kData = unpack(KEYS)
+ if #ARGV % 4 ~= 0 then return redis.error_reply('Unmatched arguments') end
+ local pushed = 0
+ for i = 1,#ARGV,4 do
+ local id,sha1,rtimestamp,blob = ARGV[i],ARGV[i+1],ARGV[i+2],ARGV[i+3]
+ if sha1 == '' or redis.call('hExists',kIdBySha1,sha1) == 0 then
+ if 1*rtimestamp > 0 then
+ -- Insert into delayed queue (release time as score)
+ redis.call('zAdd',kDelayed,rtimestamp,id)
+ else
+ -- Insert into unclaimed queue
+ redis.call('lPush',kUnclaimed,id)
+ end
+ if sha1 ~= '' then
+ redis.call('hSet',kSha1ById,id,sha1)
+ redis.call('hSet',kIdBySha1,sha1,id)
+ end
+ redis.call('hSet',kData,id,blob)
+ pushed = pushed + 1
+ end
+ end
+ return pushed
+LUA;
+ return $conn->luaEval( $script,
+ array_merge(
+ array(
+ $this->getQueueKey( 'l-unclaimed' ), # KEYS[1]
+ $this->getQueueKey( 'h-sha1ById' ), # KEYS[2]
+ $this->getQueueKey( 'h-idBySha1' ), # KEYS[3]
+ $this->getQueueKey( 'z-delayed' ), # KEYS[4]
+ $this->getQueueKey( 'h-data' ), # KEYS[5]
+ ),
+ $args
+ ),
+ 5 # number of first argument(s) that are keys
+ );
+ }
+
+ /**
+ * @see JobQueue::doPop()
+ * @return Job|bool
+ * @throws JobQueueError
+ */
+ protected function doPop() {
+ $job = false;
+
+ // Push ready delayed jobs into the queue every 10 jobs to spread the load.
+ // This is also done as a periodic task, but we don't want too much done at once.
+ if ( $this->checkDelay && mt_rand( 0, 9 ) == 0 ) {
+ $this->recyclePruneAndUndelayJobs();
+ }
+
+ $conn = $this->getConnection();
+ try {
+ do {
+ if ( $this->claimTTL > 0 ) {
+ // Keep the claimed job list down for high-traffic queues
+ if ( mt_rand( 0, 99 ) == 0 ) {
+ $this->recyclePruneAndUndelayJobs();
+ }
+ $blob = $this->popAndAcquireBlob( $conn );
+ } else {
+ $blob = $this->popAndDeleteBlob( $conn );
+ }
+ if ( !is_string( $blob ) ) {
+ break; // no jobs; nothing to do
+ }
+
+ JobQueue::incrStats( 'job-pop', $this->type, 1, $this->wiki );
+ $item = $this->unserialize( $blob );
+ if ( $item === false ) {
+ wfDebugLog( 'JobQueueRedis', "Could not unserialize {$this->type} job." );
+ continue;
+ }
+
+ // If $item is invalid, recyclePruneAndUndelayJobs() will cleanup as needed
+ $job = $this->getJobFromFields( $item ); // may be false
+ } while ( !$job ); // job may be false if invalid
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+
+ return $job;
+ }
+
+ /**
+ * @param RedisConnRef $conn
+ * @return array Serialized string or false
+ * @throws RedisException
+ */
+ protected function popAndDeleteBlob( RedisConnRef $conn ) {
+ static $script =
+<<<LUA
+ local kUnclaimed, kSha1ById, kIdBySha1, kData = unpack(KEYS)
+ -- Pop an item off the queue
+ local id = redis.call('rpop',kUnclaimed)
+ if not id then return false end
+ -- Get the job data and remove it
+ local item = redis.call('hGet',kData,id)
+ redis.call('hDel',kData,id)
+ -- Allow new duplicates of this job
+ local sha1 = redis.call('hGet',kSha1ById,id)
+ if sha1 then redis.call('hDel',kIdBySha1,sha1) end
+ redis.call('hDel',kSha1ById,id)
+ -- Return the job data
+ return item
+LUA;
+ return $conn->luaEval( $script,
+ array(
+ $this->getQueueKey( 'l-unclaimed' ), # KEYS[1]
+ $this->getQueueKey( 'h-sha1ById' ), # KEYS[2]
+ $this->getQueueKey( 'h-idBySha1' ), # KEYS[3]
+ $this->getQueueKey( 'h-data' ), # KEYS[4]
+ ),
+ 4 # number of first argument(s) that are keys
+ );
+ }
+
+ /**
+ * @param RedisConnRef $conn
+ * @return array Serialized string or false
+ * @throws RedisException
+ */
+ protected function popAndAcquireBlob( RedisConnRef $conn ) {
+ static $script =
+<<<LUA
+ local kUnclaimed, kSha1ById, kIdBySha1, kClaimed, kAttempts, kData = unpack(KEYS)
+ -- Pop an item off the queue
+ local id = redis.call('rPop',kUnclaimed)
+ if not id then return false end
+ -- Allow new duplicates of this job
+ local sha1 = redis.call('hGet',kSha1ById,id)
+ if sha1 then redis.call('hDel',kIdBySha1,sha1) end
+ redis.call('hDel',kSha1ById,id)
+ -- Mark the jobs as claimed and return it
+ redis.call('zAdd',kClaimed,ARGV[1],id)
+ redis.call('hIncrBy',kAttempts,id,1)
+ return redis.call('hGet',kData,id)
+LUA;
+ return $conn->luaEval( $script,
+ array(
+ $this->getQueueKey( 'l-unclaimed' ), # KEYS[1]
+ $this->getQueueKey( 'h-sha1ById' ), # KEYS[2]
+ $this->getQueueKey( 'h-idBySha1' ), # KEYS[3]
+ $this->getQueueKey( 'z-claimed' ), # KEYS[4]
+ $this->getQueueKey( 'h-attempts' ), # KEYS[5]
+ $this->getQueueKey( 'h-data' ), # KEYS[6]
+ time(), # ARGV[1] (injected to be replication-safe)
+ ),
+ 6 # number of first argument(s) that are keys
+ );
+ }
+
+ /**
+ * @see JobQueue::doAck()
+ * @param Job $job
+ * @return Job|bool
+ * @throws MWException|JobQueueError
+ */
+ protected function doAck( Job $job ) {
+ if ( !isset( $job->metadata['uuid'] ) ) {
+ throw new MWException( "Job of type '{$job->getType()}' has no UUID." );
+ }
+ if ( $this->claimTTL > 0 ) {
+ $conn = $this->getConnection();
+ try {
+ static $script =
+<<<LUA
+ local kClaimed, kAttempts, kData = unpack(KEYS)
+ -- Unmark the job as claimed
+ redis.call('zRem',kClaimed,ARGV[1])
+ redis.call('hDel',kAttempts,ARGV[1])
+ -- Delete the job data itself
+ return redis.call('hDel',kData,ARGV[1])
+LUA;
+ $res = $conn->luaEval( $script,
+ array(
+ $this->getQueueKey( 'z-claimed' ), # KEYS[1]
+ $this->getQueueKey( 'h-attempts' ), # KEYS[2]
+ $this->getQueueKey( 'h-data' ), # KEYS[3]
+ $job->metadata['uuid'] # ARGV[1]
+ ),
+ 3 # number of first argument(s) that are keys
+ );
+
+ if ( !$res ) {
+ wfDebugLog( 'JobQueueRedis', "Could not acknowledge {$this->type} job." );
+
+ return false;
+ }
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * @see JobQueue::doDeduplicateRootJob()
+ * @param Job $job
+ * @return bool
+ * @throws MWException|JobQueueError
+ */
+ protected function doDeduplicateRootJob( Job $job ) {
+ if ( !$job->hasRootJobParams() ) {
+ throw new MWException( "Cannot register root job; missing parameters." );
+ }
+ $params = $job->getRootJobParams();
+
+ $key = $this->getRootJobCacheKey( $params['rootJobSignature'] );
+
+ $conn = $this->getConnection();
+ try {
+ $timestamp = $conn->get( $key ); // current last timestamp of this job
+ if ( $timestamp && $timestamp >= $params['rootJobTimestamp'] ) {
+ return true; // a newer version of this root job was enqueued
+ }
+
+ // Update the timestamp of the last root job started at the location...
+ return $conn->set( $key, $params['rootJobTimestamp'], self::ROOTJOB_TTL ); // 2 weeks
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::doIsRootJobOldDuplicate()
+ * @param Job $job
+ * @return bool
+ * @throws JobQueueError
+ */
+ protected function doIsRootJobOldDuplicate( Job $job ) {
+ if ( !$job->hasRootJobParams() ) {
+ return false; // job has no de-deplication info
+ }
+ $params = $job->getRootJobParams();
+
+ $conn = $this->getConnection();
+ try {
+ // Get the last time this root job was enqueued
+ $timestamp = $conn->get( $this->getRootJobCacheKey( $params['rootJobSignature'] ) );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+
+ // Check if a new root job was started at the location after this one's...
+ return ( $timestamp && $timestamp > $params['rootJobTimestamp'] );
+ }
+
+ /**
+ * @see JobQueue::doDelete()
+ * @return bool
+ * @throws JobQueueError
+ */
+ protected function doDelete() {
+ static $props = array( 'l-unclaimed', 'z-claimed', 'z-abandoned',
+ 'z-delayed', 'h-idBySha1', 'h-sha1ById', 'h-attempts', 'h-data' );
+
+ $conn = $this->getConnection();
+ try {
+ $keys = array();
+ foreach ( $props as $prop ) {
+ $keys[] = $this->getQueueKey( $prop );
+ }
+
+ return ( $conn->delete( $keys ) !== false );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::getAllQueuedJobs()
+ * @return Iterator
+ */
+ public function getAllQueuedJobs() {
+ $conn = $this->getConnection();
+ try {
+ $that = $this;
+
+ return new MappedIterator(
+ $conn->lRange( $this->getQueueKey( 'l-unclaimed' ), 0, -1 ),
+ function ( $uid ) use ( $that, $conn ) {
+ return $that->getJobFromUidInternal( $uid, $conn );
+ },
+ array( 'accept' => function ( $job ) {
+ return is_object( $job );
+ } )
+ );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * @see JobQueue::getAllQueuedJobs()
+ * @return Iterator
+ */
+ public function getAllDelayedJobs() {
+ $conn = $this->getConnection();
+ try {
+ $that = $this;
+
+ return new MappedIterator( // delayed jobs
+ $conn->zRange( $this->getQueueKey( 'z-delayed' ), 0, -1 ),
+ function ( $uid ) use ( $that, $conn ) {
+ return $that->getJobFromUidInternal( $uid, $conn );
+ },
+ array( 'accept' => function ( $job ) {
+ return is_object( $job );
+ } )
+ );
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ public function getCoalesceLocationInternal() {
+ return "RedisServer:" . $this->server;
+ }
+
+ protected function doGetSiblingQueuesWithJobs( array $types ) {
+ return array_keys( array_filter( $this->doGetSiblingQueueSizes( $types ) ) );
+ }
+
+ protected function doGetSiblingQueueSizes( array $types ) {
+ $sizes = array(); // (type => size)
+ $types = array_values( $types ); // reindex
+ $conn = $this->getConnection();
+ try {
+ $conn->multi( Redis::PIPELINE );
+ foreach ( $types as $type ) {
+ $conn->lSize( $this->getQueueKey( 'l-unclaimed', $type ) );
+ }
+ $res = $conn->exec();
+ if ( is_array( $res ) ) {
+ foreach ( $res as $i => $size ) {
+ $sizes[$types[$i]] = $size;
+ }
+ }
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+
+ return $sizes;
+ }
+
+ /**
+ * This function should not be called outside JobQueueRedis
+ *
+ * @param string $uid
+ * @param RedisConnRef $conn
+ * @return Job|bool Returns false if the job does not exist
+ * @throws MWException|JobQueueError
+ */
+ public function getJobFromUidInternal( $uid, RedisConnRef $conn ) {
+ try {
+ $data = $conn->hGet( $this->getQueueKey( 'h-data' ), $uid );
+ if ( $data === false ) {
+ return false; // not found
+ }
+ $item = $this->unserialize( $conn->hGet( $this->getQueueKey( 'h-data' ), $uid ) );
+ if ( !is_array( $item ) ) { // this shouldn't happen
+ throw new MWException( "Could not find job with ID '$uid'." );
+ }
+ $title = Title::makeTitle( $item['namespace'], $item['title'] );
+ $job = Job::factory( $item['type'], $title, $item['params'] );
+ $job->metadata['uuid'] = $item['uuid'];
+
+ return $job;
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+ }
+
+ /**
+ * Recycle or destroy any jobs that have been claimed for too long
+ * and release any ready delayed jobs into the queue
+ *
+ * @return int Number of jobs recycled/deleted/undelayed
+ * @throws MWException|JobQueueError
+ */
+ public function recyclePruneAndUndelayJobs() {
+ $count = 0;
+ // For each job item that can be retried, we need to add it back to the
+ // main queue and remove it from the list of currenty claimed job items.
+ // For those that cannot, they are marked as dead and kept around for
+ // investigation and manual job restoration but are eventually deleted.
+ $conn = $this->getConnection();
+ try {
+ $now = time();
+ static $script =
+<<<LUA
+ local kClaimed, kAttempts, kUnclaimed, kData, kAbandoned, kDelayed = unpack(KEYS)
+ local released,abandoned,pruned,undelayed = 0,0,0,0
+ -- Get all non-dead jobs that have an expired claim on them.
+ -- The score for each item is the last claim timestamp (UNIX).
+ local staleClaims = redis.call('zRangeByScore',kClaimed,0,ARGV[1])
+ for k,id in ipairs(staleClaims) do
+ local timestamp = redis.call('zScore',kClaimed,id)
+ local attempts = redis.call('hGet',kAttempts,id)
+ if attempts < ARGV[3] then
+ -- Claim expired and retries left: re-enqueue the job
+ redis.call('lPush',kUnclaimed,id)
+ redis.call('hIncrBy',kAttempts,id,1)
+ released = released + 1
+ else
+ -- Claim expired and no retries left: mark the job as dead
+ redis.call('zAdd',kAbandoned,timestamp,id)
+ abandoned = abandoned + 1
+ end
+ redis.call('zRem',kClaimed,id)
+ end
+ -- Get all of the dead jobs that have been marked as dead for too long.
+ -- The score for each item is the last claim timestamp (UNIX).
+ local deadClaims = redis.call('zRangeByScore',kAbandoned,0,ARGV[2])
+ for k,id in ipairs(deadClaims) do
+ -- Stale and out of retries: remove any traces of the job
+ redis.call('zRem',kAbandoned,id)
+ redis.call('hDel',kAttempts,id)
+ redis.call('hDel',kData,id)
+ pruned = pruned + 1
+ end
+ -- Get the list of ready delayed jobs, sorted by readiness (UNIX timestamp)
+ local ids = redis.call('zRangeByScore',kDelayed,0,ARGV[4])
+ -- Migrate the jobs from the "delayed" set to the "unclaimed" list
+ for k,id in ipairs(ids) do
+ redis.call('lPush',kUnclaimed,id)
+ redis.call('zRem',kDelayed,id)
+ end
+ undelayed = #ids
+ return {released,abandoned,pruned,undelayed}
+LUA;
+ $res = $conn->luaEval( $script,
+ array(
+ $this->getQueueKey( 'z-claimed' ), # KEYS[1]
+ $this->getQueueKey( 'h-attempts' ), # KEYS[2]
+ $this->getQueueKey( 'l-unclaimed' ), # KEYS[3]
+ $this->getQueueKey( 'h-data' ), # KEYS[4]
+ $this->getQueueKey( 'z-abandoned' ), # KEYS[5]
+ $this->getQueueKey( 'z-delayed' ), # KEYS[6]
+ $now - $this->claimTTL, # ARGV[1]
+ $now - self::MAX_AGE_PRUNE, # ARGV[2]
+ $this->maxTries, # ARGV[3]
+ $now # ARGV[4]
+ ),
+ 6 # number of first argument(s) that are keys
+ );
+ if ( $res ) {
+ list( $released, $abandoned, $pruned, $undelayed ) = $res;
+ $count += $released + $pruned + $undelayed;
+ JobQueue::incrStats( 'job-recycle', $this->type, $released, $this->wiki );
+ JobQueue::incrStats( 'job-abandon', $this->type, $abandoned, $this->wiki );
+ JobQueue::incrStats( 'job-undelay', $this->type, $undelayed, $this->wiki );
+ }
+ } catch ( RedisException $e ) {
+ $this->throwRedisException( $conn, $e );
+ }
+
+ return $count;
+ }
+
+ /**
+ * @return array
+ */
+ protected function doGetPeriodicTasks() {
+ if ( $this->daemonized ) {
+ return array(); // managed in the runner loop
+ }
+ $periods = array( 3600 ); // standard cleanup (useful on config change)
+ if ( $this->claimTTL > 0 ) {
+ $periods[] = ceil( $this->claimTTL / 2 ); // avoid bad timing
+ }
+ if ( $this->checkDelay ) {
+ $periods[] = 300; // 5 minutes
+ }
+ $period = min( $periods );
+ $period = max( $period, 30 ); // sanity
+
+ return array(
+ 'recyclePruneAndUndelayJobs' => array(
+ 'callback' => array( $this, 'recyclePruneAndUndelayJobs' ),
+ 'period' => $period,
+ )
+ );
+ }
+
+ /**
+ * @param IJobSpecification $job
+ * @return array
+ */
+ protected function getNewJobFields( IJobSpecification $job ) {
+ return array(
+ // Fields that describe the nature of the job
+ 'type' => $job->getType(),
+ 'namespace' => $job->getTitle()->getNamespace(),
+ 'title' => $job->getTitle()->getDBkey(),
+ 'params' => $job->getParams(),
+ // Some jobs cannot run until a "release timestamp"
+ 'rtimestamp' => $job->getReleaseTimestamp() ?: 0,
+ // Additional job metadata
+ 'uuid' => UIDGenerator::newRawUUIDv4( UIDGenerator::QUICK_RAND ),
+ 'sha1' => $job->ignoreDuplicates()
+ ? wfBaseConvert( sha1( serialize( $job->getDeduplicationInfo() ) ), 16, 36, 31 )
+ : '',
+ 'timestamp' => time() // UNIX timestamp
+ );
+ }
+
+ /**
+ * @param array $fields
+ * @return Job|bool
+ */
+ protected function getJobFromFields( array $fields ) {
+ $title = Title::makeTitleSafe( $fields['namespace'], $fields['title'] );
+ if ( $title ) {
+ $job = Job::factory( $fields['type'], $title, $fields['params'] );
+ $job->metadata['uuid'] = $fields['uuid'];
+
+ return $job;
+ }
+
+ return false;
+ }
+
+ /**
+ * @param array $fields
+ * @return string Serialized and possibly compressed version of $fields
+ */
+ protected function serialize( array $fields ) {
+ $blob = serialize( $fields );
+ if ( $this->compression === 'gzip'
+ && strlen( $blob ) >= 1024
+ && function_exists( 'gzdeflate' )
+ ) {
+ $object = (object)array( 'blob' => gzdeflate( $blob ), 'enc' => 'gzip' );
+ $blobz = serialize( $object );
+
+ return ( strlen( $blobz ) < strlen( $blob ) ) ? $blobz : $blob;
+ } else {
+ return $blob;
+ }
+ }
+
+ /**
+ * @param string $blob
+ * @return array|bool Unserialized version of $blob or false
+ */
+ protected function unserialize( $blob ) {
+ $fields = unserialize( $blob );
+ if ( is_object( $fields ) ) {
+ if ( $fields->enc === 'gzip' && function_exists( 'gzinflate' ) ) {
+ $fields = unserialize( gzinflate( $fields->blob ) );
+ } else {
+ $fields = false;
+ }
+ }
+
+ return is_array( $fields ) ? $fields : false;
+ }
+
+ /**
+ * Get a connection to the server that handles all sub-queues for this queue
+ *
+ * @return RedisConnRef
+ * @throws JobQueueConnectionError
+ */
+ protected function getConnection() {
+ $conn = $this->redisPool->getConnection( $this->server );
+ if ( !$conn ) {
+ throw new JobQueueConnectionError( "Unable to connect to redis server." );
+ }
+
+ return $conn;
+ }
+
+ /**
+ * @param RedisConnRef $conn
+ * @param RedisException $e
+ * @throws JobQueueError
+ */
+ protected function throwRedisException( RedisConnRef $conn, $e ) {
+ $this->redisPool->handleError( $conn, $e );
+ throw new JobQueueError( "Redis server error: {$e->getMessage()}\n" );
+ }
+
+ /**
+ * @param string $prop
+ * @param string|null $type
+ * @return string
+ */
+ private function getQueueKey( $prop, $type = null ) {
+ $type = is_string( $type ) ? $type : $this->type;
+ list( $db, $prefix ) = wfSplitWikiID( $this->wiki );
+ if ( strlen( $this->key ) ) { // namespaced queue (for testing)
+ return wfForeignMemcKey( $db, $prefix, 'jobqueue', $type, $this->key, $prop );
+ } else {
+ return wfForeignMemcKey( $db, $prefix, 'jobqueue', $type, $prop );
+ }
+ }
+
+ /**
+ * @param string $key
+ * @return void
+ */
+ public function setTestingPrefix( $key ) {
+ $this->key = $key;
+ }
+}
generated by cgit v1.2.2 (git 2.25.0) at 2024-04-23 14:19:20 +0000