includes/jobqueue/jobs/DeleteLinksJob.php

   1 <?php
   2 /**
   3  * Job to update link tables for pages
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup JobQueue
  22  */
  23
  24 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Job to prune link tables for pages that were deleted
  28  *
  29  * Only DataUpdate classes should construct these jobs
  30  *
  31  * @ingroup JobQueue
  32  * @since 1.27
  33  */
  34 class DeleteLinksJob extends Job {
  35         function __construct( Title $title, array $params ) {
  36                 parent::__construct( 'deleteLinks', $title, $params );
  37                 $this->removeDuplicates = true;
  38         }
  39
  40         function run() {
  41                 if ( is_null( $this->title ) ) {
  42                         $this->setLastError( "deleteLinks: Invalid title" );
  43                         return false;
  44                 }
  45
  46                 $pageId = $this->params['pageId'];
  47
  48                 // Serialize links updates by page ID so they see each others' changes
  49                 $scopedLock = LinksUpdate::acquirePageLock( wfGetDB( DB_MASTER ), $pageId, 'job' );
  50                 if ( $scopedLock === null ) {
  51                         $this->setLastError( 'LinksUpdate already running for this page, try again later.' );
  52                         return false;
  53                 }
  54
  55                 if ( WikiPage::newFromID( $pageId, WikiPage::READ_LATEST ) ) {
  56                         // The page was restored somehow or something went wrong
  57                         $this->setLastError( "deleteLinks: Page #$pageId exists" );
  58                         return false;
  59                 }
  60
  61                 $factory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
  62                 $timestamp = $this->params['timestamp'] ?? null;
  63                 $page = WikiPage::factory( $this->title ); // title when deleted
  64
  65                 $update = new LinksDeletionUpdate( $page, $pageId, $timestamp );
  66                 $update->setTransactionTicket( $factory->getEmptyTransactionTicket( __METHOD__ ) );
  67                 $update->doUpdate();
  68
  69                 return true;
  70         }
  71 }