maintenance: Remove cross-wiki purging from rebuildmessages.php

This script relied on numerous outdated or unofficial methods that
are no longer supported.

* Global variable $messageMemc holding a BagOStuff based on
  MessageCacheType. This logic is now in ServiceWiring
  for the MessageCache service.

* String "{$db}:messages", should have been using BagOStuff::makeKey()
  and may've fallen out of sync.

* Deleting keys outright instead of touching check keys as
  MessageCache does, since it's been using WANObjectCache for
  several years.

All of this should be done via MessageCache::clear(), but that
can't be easily constructed across wikis on a wiki farm. That
requires instantiating the script for other wikis separately.

Remove support for that, recommending instead that site admins
run it in a loop for each wiki as needed.

Realistically though, that should never be needed. The script has
virtually no known use case, except (as documented in maintenance/README)
"after changing a wiki's content language" - which applies to one
wiki, not all a once.

Change-Id: I9f45d65f5cef93d6e332baf26d955d3f7a7c19d2

diff --git a/maintenance/rebuildmessages.php b/maintenance/rebuildmessages.php
index 88eaf67..2f8dcc4 100644 (file)
--- a/maintenance/rebuildmessages.php
+++ b/maintenance/rebuildmessages.php
@@ -1,7 +1,5 @@
 <?php
 /**
- * Purge all languages from the message cache.
- *
  * 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
@@ -21,35 +19,26 @@
  * @ingroup Maintenance
  */
 
+use MediaWiki\MediaWikiServices;
+
 require_once __DIR__ . '/Maintenance.php';
 
 /**
- * Maintenance script that purges all languages from the message cache.
+ * Maintenance script that purges cache used by MessageCache.
  *
  * @ingroup Maintenance
  */
 class RebuildMessages extends Maintenance {
        public function __construct() {
                parent::__construct();
-               $this->addDescription( 'Purge all language messages from the cache' );
+               $this->addDescription( 'Purge the MessageCache for all interface languages.' );
        }
 
        public function execute() {
-               global $wgLocalDatabases, $wgDBname, $wgEnableSidebarCache, $messageMemc;
-               if ( $wgLocalDatabases ) {
-                       $databases = $wgLocalDatabases;
-               } else {
-                       $databases = [ $wgDBname ];
-               }
-
-               foreach ( $databases as $db ) {
-                       $this->output( "Deleting message cache for {$db}... " );
-                       $messageMemc->delete( "{$db}:messages" );
-                       if ( $wgEnableSidebarCache ) {
-                               $messageMemc->delete( "{$db}:sidebar" );
-                       }
-                       $this->output( "Deleted\n" );
-               }
+               $this->output( "Purging message cache for all languages on this wiki... " );
+               $messageCache = MediaWikiServices::getInstance()->getMessageCache();
+               $messageCache->clear();
+               $this->output( "Done\n" );
        }
 }