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+<?php
+/**
+ * Job queue aggregator code that uses PhpRedis.
+ *
+ * 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
+ */
+use Psr\Log\LoggerInterface;
+
+/**
+ * Class to handle tracking information about all queues using PhpRedis
+ *
+ * The mediawiki/services/jobrunner background service must be set up and running.
+ *
+ * @ingroup JobQueue
+ * @ingroup Redis
+ * @since 1.21
+ */
+class JobQueueAggregatorRedis extends JobQueueAggregator {
+ /** @var RedisConnectionPool */
+ protected $redisPool;
+ /** @var LoggerInterface */
+ protected $logger;
+ /** @var array List of Redis server addresses */
+ protected $servers;
+
+ /**
+ * @param array $params Possible keys:
+ * - redisConfig : An array of parameters to RedisConnectionPool::__construct().
+ * - redisServers : Array of server entries, the first being the primary and the
+ * others being fallback servers. Each entry is either 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.
+ */
+ public function __construct( array $params ) {
+ parent::__construct( $params );
+ $this->servers = isset( $params['redisServers'] )
+ ? $params['redisServers']
+ : [ $params['redisServer'] ]; // b/c
+ $params['redisConfig']['serializer'] = 'none';
+ $this->redisPool = RedisConnectionPool::singleton( $params['redisConfig'] );
+ $this->logger = \MediaWiki\Logger\LoggerFactory::getInstance( 'redis' );
+ }
+
+ protected function doNotifyQueueEmpty( $wiki, $type ) {
+ return true; // managed by the service
+ }
+
+ protected function doNotifyQueueNonEmpty( $wiki, $type ) {
+ return true; // managed by the service
+ }
+
+ protected function doGetAllReadyWikiQueues() {
+ $conn = $this->getConnection();
+ if ( !$conn ) {
+ return [];
+ }
+ try {
+ $map = $conn->hGetAll( $this->getReadyQueueKey() );
+
+ if ( is_array( $map ) && isset( $map['_epoch'] ) ) {
+ unset( $map['_epoch'] ); // ignore
+ $pendingDBs = []; // (type => list of wikis)
+ foreach ( $map as $key => $time ) {
+ list( $type, $wiki ) = $this->decodeQueueName( $key );
+ $pendingDBs[$type][] = $wiki;
+ }
+ } else {
+ throw new UnexpectedValueException(
+ "No queue listing found; make sure redisJobChronService is running."
+ );
+ }
+
+ return $pendingDBs;
+ } catch ( RedisException $e ) {
+ $this->redisPool->handleError( $conn, $e );
+
+ return [];
+ }
+ }
+
+ protected function doPurge() {
+ return true; // fully and only refreshed by the service
+ }
+
+ /**
+ * Get a connection to the server that handles all sub-queues for this queue
+ *
+ * @return RedisConnRef|bool Returns false on failure
+ * @throws MWException
+ */
+ protected function getConnection() {
+ $conn = false;
+ foreach ( $this->servers as $server ) {
+ $conn = $this->redisPool->getConnection( $server, $this->logger );
+ if ( $conn ) {
+ break;
+ }
+ }
+
+ return $conn;
+ }
+
+ /**
+ * @return string
+ */
+ private function getReadyQueueKey() {
+ return "jobqueue:aggregator:h-ready-queues:v2"; // global
+ }
+
+ /**
+ * @param string $name
+ * @return string[]
+ */
+ private function decodeQueueName( $name ) {
+ list( $type, $wiki ) = explode( '/', $name, 2 );
+
+ return [ rawurldecode( $type ), rawurldecode( $wiki ) ];
+ }
+}