maintenance/deleteImageMemcached.php

   1 <?php
   2 /**
   3  * Delete image information from the object cache.
   4  *
   5  * Usage example:
   6  * php deleteImageMemcached.php --until "2005-09-05 00:00:00" --sleep 0
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  * @ingroup Maintenance
  25  */
  26
  27 require_once __DIR__ . '/Maintenance.php';
  28
  29 /**
  30  * Maintenance script that deletes image information from the object cache.
  31  *
  32  * @ingroup Maintenance
  33  */
  34 class DeleteImageCache extends Maintenance {
  35         public function __construct() {
  36                 parent::__construct();
  37                 $this->mDescription = "Delete image information from the cache";
  38                 $this->addOption( 'sleep', 'How many seconds to sleep between deletions', true, true );
  39                 $this->addOption( 'until', 'Timestamp to delete all entries prior to', true, true );
  40         }
  41
  42         public function execute() {
  43                 global $wgMemc;
  44
  45                 $until = preg_replace( "/[^\d]/", '', $this->getOption( 'until' ) );
  46                 $sleep = (int)$this->getOption( 'sleep' ) * 1000; // milliseconds
  47
  48                 ini_set( 'display_errors', false );
  49
  50                 $dbr = wfGetDB( DB_SLAVE );
  51
  52                 $res = $dbr->select( 'image',
  53                         array( 'img_name' ),
  54                         array( "img_timestamp < {$until}" ),
  55                         __METHOD__
  56                 );
  57
  58                 $i = 0;
  59                 $total = $this->getImageCount();
  60
  61                 foreach ( $res as $row ) {
  62                         if ( $i % $this->report == 0 ) {
  63                                 $this->output( sprintf(
  64                                         "%s: %13s done (%s)\n",
  65                                         wfWikiID(),
  66                                         "$i/$total",
  67                                         wfPercent( $i / $total * 100 )
  68                                 ) );
  69                         }
  70                         $md5 = md5( $row->img_name );
  71                         $wgMemc->delete( wfMemcKey( 'Image', $md5 ) );
  72
  73                         if ( $sleep != 0 ) {
  74                                 usleep( $sleep );
  75                         }
  76
  77                         ++$i;
  78                 }
  79         }
  80
  81         private function getImageCount() {
  82                 $dbr = wfGetDB( DB_SLAVE );
  83
  84                 return $dbr->selectField( 'image', 'COUNT(*)', array(), __METHOD__ );
  85         }
  86 }
  87
  88 $maintClass = "DeleteImageCache";
  89 require_once RUN_MAINTENANCE_IF_MAIN;