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<?php
/**
* Pick a database that has pending jobs
*
* 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
*
* @todo Make this work on PostgreSQL and maybe other database servers
* @ingroup Maintenance
*/
require_once( dirname(__FILE__) . '/Maintenance.php' );
class nextJobDB extends Maintenance {
public function __construct() {
parent::__construct();
$this->mDescription = "Pick a database that has pending jobs";
$this->addOption( 'type', "The type of job to search for", false, true );
}
public function execute() {
global $wgMemc;
$type = $this->getOption( 'type', false );
$mckey = $type === false
? "jobqueue:dbs"
: "jobqueue:dbs:$type";
$pendingDBs = $wgMemc->get( $mckey );
# If we didn't get it from the cache
if( !$pendingDBs ) {
$pendingDBs = $this->getPendingDbs( $type );
$wgMemc->get( $mckey, $pendingDBs, 300 );
}
# If we've got a pending job in a db, display it.
if ( $pendingDBs ) {
$this->output( $pendingDBs[mt_rand(0, count( $pendingDBs ) - 1)] );
}
}
/**
* Get all databases that have a pending job
* @param $type String Job type
* @return array
*/
private function getPendingDbs( $type ) {
global $wgLocalDatabases;
$pendingDBs = array();
# Cross-reference DBs by master DB server
$dbsByMaster = array();
foreach ( $wgLocalDatabases as $db ) {
$lb = wfGetLB( $db );
$dbsByMaster[$lb->getServerName(0)][] = $db;
}
foreach ( $dbsByMaster as $master => $dbs ) {
$dbConn = wfGetDB( DB_MASTER, array(), $dbs[0] );
$stype = $dbConn->addQuotes( $type );
# Padding row for MySQL bug
$sql = "(SELECT '-------------------------------------------' as db)";
foreach ( $dbs as $wikiId ) {
if ( $sql != '' ) {
$sql .= ' UNION ';
}
list( $dbName, $tablePrefix ) = wfSplitWikiID( $wikiId );
$dbConn->tablePrefix( $tablePrefix );
$jobTable = $dbConn->tableName( 'job' );
if ( $type === false )
$sql .= "(SELECT '$wikiId' as db FROM $dbName.$jobTable LIMIT 1)";
else
$sql .= "(SELECT '$wikiId' as db FROM $dbName.$jobTable WHERE job_cmd=$stype LIMIT 1)";
}
$res = $dbConn->query( $sql, __METHOD__ );
$first = true;
foreach ( $res as $row ) {
if ( $first ) {
// discard padding row
$first = false;
continue;
}
$pendingDBs[] = $row->db;
}
}
return $pendingDBs;
}
}
$maintClass = "nextJobDb";
require_once( DO_MAINTENANCE );
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