maintenance/populateRevisionLength.php

   1 <?php
   2 /*
   3  * Makes the required database updates for rev_len
   4  * to be of any use. It can be used for some simple tracking
   5  * and to find new page edits by users.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @ingroup Maintenance
  23  */
  24
  25 require_once( dirname(__FILE__) . '/Maintenance.php' );
  26
  27 class PopulateRevisionLength extends Maintenance {
  28         public function __construct() {
  29                 parent::__construct();
  30                 $this->mDescription = "Populates rev_len";
  31                 $this->setBatchSize( 200 );
  32         }
  33
  34         public function execute() {
  35                 $db = wfGetDB( DB_MASTER );
  36                 if ( !$db->tableExists( 'revision' ) ) {
  37                         $this->error( "revision table does not exist", true );
  38                 }
  39                 $this->output( "Populating rev_len column\n" );
  40                 $start = $db->selectField( 'revision', 'MIN(rev_id)', false, __FUNCTION__ );
  41                 $end = $db->selectField( 'revision', 'MAX(rev_id)', false, __FUNCTION__ );
  42                 if( is_null( $start ) || is_null( $end ) ){
  43                         $this->output( "...revision table seems to be empty.\n" );
  44                         $db->insert( 'updatelog',
  45                                 array( 'ul_key' => 'populate rev_len' ),
  46                                 __METHOD__,
  47                                 'IGNORE' );
  48                         return;
  49                 }
  50                 # Do remaining chunks
  51                 $blockStart = intval( $start );
  52                 $blockEnd = intval( $start ) + $this->mBatchSize - 1;
  53                 $count = 0;
  54                 while( $blockStart <= $end ) {
  55                         $this->output( "...doing rev_id from $blockStart to $blockEnd\n" );
  56                         $res = $db->select( 'revision',
  57                                             Revision::selectFields(),
  58                                             array( "rev_id >= $blockStart",
  59                                                    "rev_id <= $blockEnd",
  60                                                    "rev_len IS NULL" ),
  61                                             __METHOD__ );
  62                         # Go through and update rev_len from these rows.
  63                         foreach( $res as $row ) {
  64                                 $rev = new Revision( $row );
  65                                 $text = $rev->getRawText();
  66                                 # Update the row...
  67                                 $db->update( 'revision',
  68                                              array( 'rev_len' => strlen( $text ) ),
  69                                              array( 'rev_id' => $row->rev_id ),
  70                                              __METHOD__ );
  71                                 $count++;
  72                         }
  73                         $blockStart += $this->mBatchSize;
  74                         $blockEnd += $this->mBatchSize;
  75                         wfWaitForSlaves( 5 );
  76                 }
  77                 $logged = $db->insert( 'updatelog',
  78                         array( 'ul_key' => 'populate rev_len' ),
  79                         __METHOD__,
  80                         'IGNORE' );
  81                 if( $logged ) {
  82                         $this->output( "rev_len population complete ... {$count} rows changed\n" );
  83                         return true;
  84                 } else {
  85                         $this->output( "Could not insert rev_len population row.\n" );
  86                         return false;
  87                 }
  88         }
  89 }
  90
  91 $maintClass = "PopulateRevisionLength";
  92 require_once( DO_MAINTENANCE );