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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;
/** @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']
: array( $params['redisServer'] ); // b/c
$params['redisConfig']['serializer'] = 'none';
$this->redisPool = RedisConnectionPool::singleton( $params['redisConfig'] );
}
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;
}
}
protected function doNotifyQueueNonEmpty( $wiki, $type ) {
$conn = $this->getConnection();
if ( !$conn ) {
return false;
}
try {
$conn->multi( Redis::PIPELINE );
$conn->hSetNx( $this->getQueueTypesKey(), $type, 'enabled' );
$conn->hSet( $this->getReadyQueueKey(), $this->encQueueName( $type, $wiki ), time() );
$conn->exec();
return true;
} catch ( RedisException $e ) {
$this->handleException( $conn, $e );
return false;
}
}
protected function doGetAllReadyWikiQueues() {
$conn = $this->getConnection();
if ( !$conn ) {
return array();
}
try {
$map = $conn->hGetAll( $this->getReadyQueueKey() );
if ( is_array( $map ) && isset( $map['_epoch'] ) ) {
unset( $map['_epoch'] ); // ignore
$pendingDBs = array(); // (type => list of wikis)
foreach ( $map as $key => $time ) {
list( $type, $wiki ) = $this->dencQueueName( $key );
$pendingDBs[$type][] = $wiki;
}
} else {
// Avoid duplicated effort
$rand = wfRandomString( 32 );
$conn->multi( Redis::MULTI );
$conn->setex( "{$rand}:lock", 3600, 1 );
$conn->renamenx( "{$rand}:lock", $this->getReadyQueueKey() . ":lock" );
if ( $conn->exec() !== array( true, true ) ) { // lock
$conn->delete( "{$rand}:lock" );
return array(); // already in progress
}
$pendingDBs = $this->findPendingWikiQueues(); // (type => list of wikis)
$conn->multi( Redis::PIPELINE );
$now = time();
$map = array( '_epoch' => time() ); // dummy key for empty Redis collections
foreach ( $pendingDBs as $type => $wikis ) {
$conn->hSetNx( $this->getQueueTypesKey(), $type, 'enabled' );
foreach ( $wikis as $wiki ) {
$map[$this->encQueueName( $type, $wiki )] = $now;
}
}
$conn->hMSet( $this->getReadyQueueKey(), $map );
$conn->exec();
$conn->delete( $this->getReadyQueueKey() . ":lock" ); // unlock
}
return $pendingDBs;
} catch ( RedisException $e ) {
$this->handleException( $conn, $e );
return array();
}
}
protected function doPurge() {
$conn = $this->getConnection();
if ( !$conn ) {
return false;
}
try {
$conn->delete( $this->getReadyQueueKey() );
// leave key at getQueueTypesKey() alone
} 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 RedisConnRef|bool Returns false on failure
* @throws MWException
*/
protected function getConnection() {
$conn = false;
foreach ( $this->servers as $server ) {
$conn = $this->redisPool->getConnection( $server );
if ( $conn ) {
break;
}
}
return $conn;
}
/**
* @param RedisConnRef $conn
* @param RedisException $e
* @return void
*/
protected function handleException( RedisConnRef $conn, $e ) {
$this->redisPool->handleError( $conn, $e );
}
/**
* @return string
*/
private function getReadyQueueKey() {
return "jobqueue:aggregator:h-ready-queues:v2"; // global
}
/**
* @return string
*/
private function getQueueTypesKey() {
return "jobqueue:aggregator:h-queue-types:v2"; // 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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