includes/jobqueue/aggregator/JobQueueAggregatorRedis.php

   1 <?php
   2 /**
   3  * Job queue aggregator code that uses PhpRedis.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22 use Psr\Log\LoggerInterface;
  23
  24 /**
  25  * Class to handle tracking information about all queues using PhpRedis
  26  *
  27  * The mediawiki/services/jobrunner background service must be set up and running.
  28  *
  29  * @ingroup JobQueue
  30  * @ingroup Redis
  31  * @since 1.21
  32  */
  33 class JobQueueAggregatorRedis extends JobQueueAggregator {
  34         /** @var RedisConnectionPool */
  35         protected $redisPool;
  36         /** @var LoggerInterface */
  37         protected $logger;
  38         /** @var array List of Redis server addresses */
  39         protected $servers;
  40
  41         /**
  42          * @param array $params Possible keys:
  43          *   - redisConfig  : An array of parameters to RedisConnectionPool::__construct().
  44          *   - redisServers : Array of server entries, the first being the primary and the
  45          *                    others being fallback servers. Each entry is either a hostname/port
  46          *                    combination or the absolute path of a UNIX socket.
  47          *                    If a hostname is specified but no port, the standard port number
  48          *                    6379 will be used. Required.
  49          */
  50         public function __construct( array $params ) {
  51                 parent::__construct( $params );
  52                 $this->servers = isset( $params['redisServers'] )
  53                         ? $params['redisServers']
  54                         : [ $params['redisServer'] ]; // b/c
  55                 $params['redisConfig']['serializer'] = 'none';
  56                 $this->redisPool = RedisConnectionPool::singleton( $params['redisConfig'] );
  57                 $this->logger = \MediaWiki\Logger\LoggerFactory::getInstance( 'redis' );
  58         }
  59
  60         protected function doNotifyQueueEmpty( $wiki, $type ) {
  61                 return true; // managed by the service
  62         }
  63
  64         protected function doNotifyQueueNonEmpty( $wiki, $type ) {
  65                 return true; // managed by the service
  66         }
  67
  68         protected function doGetAllReadyWikiQueues() {
  69                 $conn = $this->getConnection();
  70                 if ( !$conn ) {
  71                         return [];
  72                 }
  73                 try {
  74                         $map = $conn->hGetAll( $this->getReadyQueueKey() );
  75
  76                         if ( is_array( $map ) && isset( $map['_epoch'] ) ) {
  77                                 unset( $map['_epoch'] ); // ignore
  78                                 $pendingDBs = []; // (type => list of wikis)
  79                                 foreach ( $map as $key => $time ) {
  80                                         list( $type, $wiki ) = $this->decodeQueueName( $key );
  81                                         $pendingDBs[$type][] = $wiki;
  82                                 }
  83                         } else {
  84                                 throw new UnexpectedValueException(
  85                                         "No queue listing found; make sure redisJobChronService is running."
  86                                 );
  87                         }
  88
  89                         return $pendingDBs;
  90                 } catch ( RedisException $e ) {
  91                         $this->redisPool->handleError( $conn, $e );
  92
  93                         return [];
  94                 }
  95         }
  96
  97         protected function doPurge() {
  98                 return true; // fully and only refreshed by the service
  99         }
 100
 101         /**
 102          * Get a connection to the server that handles all sub-queues for this queue
 103          *
 104          * @return RedisConnRef|bool Returns false on failure
 105          * @throws MWException
 106          */
 107         protected function getConnection() {
 108                 $conn = false;
 109                 foreach ( $this->servers as $server ) {
 110                         $conn = $this->redisPool->getConnection( $server, $this->logger );
 111                         if ( $conn ) {
 112                                 break;
 113                         }
 114                 }
 115
 116                 return $conn;
 117         }
 118
 119         /**
 120          * @return string
 121          */
 122         private function getReadyQueueKey() {
 123                 return "jobqueue:aggregator:h-ready-queues:v2"; // global
 124         }
 125
 126         /**
 127          * @param string $name
 128          * @return string[]
 129          */
 130         private function decodeQueueName( $name ) {
 131                 list( $type, $wiki ) = explode( '/', $name, 2 );
 132
 133                 return [ rawurldecode( $type ), rawurldecode( $wiki ) ];
 134         }
 135 }