MediaWiki 1.17.4

[autoinstalls/mediawiki.git] / maintenance / nextJobDB.php

diff --git a/maintenance/nextJobDB.php b/maintenance/nextJobDB.php
index dfa8d02828ac973fc53f541e519d162d8f88c6b3..8d8229e257d2e917c28822a222e9da3e24a3850a 100644 (file)
--- a/maintenance/nextJobDB.php
+++ b/maintenance/nextJobDB.php
@@ -1,62 +1,103 @@
 <?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
  */
 
-$options = array( 'type'  );
-
-require_once( 'commandLine.inc' );
-
-$type = isset($options['type'])
-               ? $options['type']
-               : false;
-
-$mckey = $type === false
-            ? "jobqueue:dbs"
-            : "jobqueue:dbs:$type";
-
-$pendingDBs = $wgMemc->get( $mckey );
-if ( !$pendingDBs ) {
-       $pendingDBs = array();
-       # Cross-reference DBs by master DB server
-       $dbsByMaster = array();
-       $defaultMaster = $wgAlternateMaster['DEFAULT'];
-       foreach ( $wgLocalDatabases as $db ) {
-               if ( isset( $wgAlternateMaster[$db] ) ) {
-                       $dbsByMaster[$wgAlternateMaster[$db]][] = $db;
-               } else {
-                       $dbsByMaster[$defaultMaster][] = $db;
-               }
+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 );
        }
 
-       foreach ( $dbsByMaster as $master => $dbs ) {
-               $dbConn = new Database( $master, $wgDBuser, $wgDBpassword );
-               $stype = $dbConn->addQuotes($type);
+       public function execute() {
+               global $wgMemc;
+               $type = $this->getOption( 'type', false );
+               $mckey = $type === false
+                                       ? "jobqueue:dbs"
+                                       : "jobqueue:dbs:$type";
+               $pendingDBs = $wgMemc->get( $mckey );
 
-               # Padding row for MySQL bug
-               $sql = "(SELECT '-------------------------------------------')";
-               foreach ( $dbs as $dbName ) {
-                       if ( $sql != '' ) {
-                               $sql .= ' UNION ';
-                       }
-                       if ($type === false)
-                               $sql .= "(SELECT '$dbName' FROM `$dbName`.job LIMIT 1)";
-                       else
-                               $sql .= "(SELECT '$dbName' FROM `$dbName`.job WHERE job_cmd=$stype LIMIT 1)";
+               # If we didn't get it from the cache
+               if ( !$pendingDBs ) {
+                       $pendingDBs = $this->getPendingDbs( $type );
+                       $wgMemc->set( $mckey, $pendingDBs, 300 );
                }
-               $res = $dbConn->query( $sql, 'nextJobDB.php' );
-               $row = $dbConn->fetchRow( $res ); // discard padding row
-               while ( $row = $dbConn->fetchRow( $res ) ) {
-                       $pendingDBs[] = $row[0];
+               # If we've got a pending job in a db, display it.
+               if ( $pendingDBs ) {
+                       $this->output( $pendingDBs[mt_rand( 0, count( $pendingDBs ) - 1 )] );
                }
        }
 
-       $wgMemc->set( $mckey, $pendingDBs, 300 );
-}
+       /**
+        * 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;
+               }
 
-if ( $pendingDBs ) {
-       echo $pendingDBs[mt_rand(0, count( $pendingDBs ) - 1)];
-}
+               foreach ( $dbsByMaster as $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( RUN_MAINTENANCE_IF_MAIN );