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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
* @author Aaron Schulz
*/
/**
* Class to handle tracking information about all queues using PhpRedis
*
* @ingroup JobQueue
* @ingroup Redis
* @since 1.21
*/
class JobQueueAggregatorRedis extends JobQueueAggregator {
/** @var RedisConnectionPool */
protected $redisPool;
/**
* @params include:
* - redisConfig : An array of parameters to RedisConnectionPool::__construct().
* - 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.
* @param array $params
*/
protected function __construct( array $params ) {
parent::__construct( $params );
$this->server = $params['redisServer'];
$this->redisPool = RedisConnectionPool::singleton( $params['redisConfig'] );
}
/**
* @see JobQueueAggregator::doNotifyQueueEmpty()
*/
protected function doNotifyQueueEmpty( $wiki, $type ) {
$conn = $this->getConnection();
if ( !$conn ) {
return false;
}
try {
$conn->hDel( $this->getReadyQueueKey(), $this->encQueueName( $type, $wiki ) );
return true;
} catch ( RedisException $e ) {
$this->handleException( $conn, $e );
return false;
}
}
/**
* @see JobQueueAggregator::doNotifyQueueNonEmpty()
*/
protected function doNotifyQueueNonEmpty( $wiki, $type ) {
$conn = $this->getConnection();
if ( !$conn ) {
return false;
}
try {
$conn->hSet( $this->getReadyQueueKey(), $this->encQueueName( $type, $wiki ), time() );
return true;
} catch ( RedisException $e ) {
$this->handleException( $conn, $e );
return false;
}
}
/**
* @see JobQueueAggregator::doAllGetReadyWikiQueues()
*/
protected function doGetAllReadyWikiQueues() {
$conn = $this->getConnection();
if ( !$conn ) {
return array();
}
try {
$conn->multi( Redis::PIPELINE );
$conn->exists( $this->getReadyQueueKey() );
$conn->hGetAll( $this->getReadyQueueKey() );
list( $exists, $map ) = $conn->exec();
if ( $exists ) { // cache hit
$pendingDBs = array(); // (type => list of wikis)
foreach ( $map as $key => $time ) {
list( $type, $wiki ) = $this->dencQueueName( $key );
$pendingDBs[$type][] = $wiki;
}
} else { // cache miss
// Avoid duplicated effort
$conn->multi( Redis::MULTI );
$conn->setnx( $this->getReadyQueueKey() . ":lock", 1 );
$conn->expire( $this->getReadyQueueKey() . ":lock", 3600 );
if ( $conn->exec() !== array( true, true ) ) { // lock
return array(); // already in progress
}
$pendingDBs = $this->findPendingWikiQueues(); // (type => list of wikis)
$conn->delete( $this->getReadyQueueKey() . ":lock" ); // unlock
$now = time();
$map = array();
foreach ( $pendingDBs as $type => $wikis ) {
foreach ( $wikis as $wiki ) {
$map[$this->encQueueName( $type, $wiki )] = $now;
}
}
$conn->hMSet( $this->getReadyQueueKey(), $map );
}
return $pendingDBs;
} catch ( RedisException $e ) {
$this->handleException( $conn, $e );
return array();
}
}
/**
* @see JobQueueAggregator::doPurge()
*/
protected function doPurge() {
$conn = $this->getConnection();
if ( !$conn ) {
return false;
}
try {
$conn->delete( $this->getReadyQueueKey() );
} catch ( RedisException $e ) {
$this->handleException( $conn, $e );
return false;
}
return true;
}
/**
* Get a connection to the server that handles all sub-queues for this queue
*
* @return Array (server name, Redis instance)
* @throws MWException
*/
protected function getConnection() {
return $this->redisPool->getConnection( $this->server );
}
/**
* @param RedisConnRef $conn
* @param RedisException $e
* @return void
*/
protected function handleException( RedisConnRef $conn, $e ) {
$this->redisPool->handleException( $this->server, $conn, $e );
}
/**
* @return string
*/
private function getReadyQueueKey() {
return "jobqueue:aggregator:h-ready-queues:v1"; // global
}
/**
* @param string $type
* @param string $wiki
* @return string
*/
private function encQueueName( $type, $wiki ) {
return rawurlencode( $type ) . '/' . rawurlencode( $wiki );
}
/**
* @param string $name
* @return string
*/
private function dencQueueName( $name ) {
list( $type, $wiki ) = explode( '/', $name, 2 );
return array( rawurldecode( $type ), rawurldecode( $wiki ) );
}
}
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