maintenance/populateRevisionSha1.php

   1 <?php
   2 /**
   3  * Fills the rev_sha1 and ar_sha1 columns of revision & archive tables.
   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  * @ingroup Maintenance
  21  */
  22
  23 require_once( dirname( __FILE__ ) . '/Maintenance.php' );
  24
  25 class PopulateRevisionSha1 extends Maintenance {
  26         public function __construct() {
  27                 parent::__construct();
  28                 $this->mDescription = "Populates the rev_sha1 and ar_sha1 fields";
  29                 $this->setBatchSize( 150 );
  30         }
  31
  32         public function execute() {
  33                 $db = wfGetDB( DB_MASTER );
  34
  35                 $this->output( "Populating rev_sha1 column\n" );
  36                 $this->doSha1Updates( $db, 'revision', 'rev_id', 'rev' );
  37
  38                 $this->output( "Populating ar_sha1 column\n" );
  39                 $this->doSha1Updates( $db, 'archive', 'ar_rev_id', 'ar' );
  40
  41                 if ( $db->insert(
  42                                 'updatelog',
  43                                 array( 'ul_key' => 'populate rev_sha1' ),
  44                                 __METHOD__,
  45                                 'IGNORE'
  46                         )
  47                 ) {
  48                         $this->output( "rev_sha1 and ar_sha1 population complete.\n" );
  49                         return true;
  50                 } else {
  51                         $this->output( "Could not insert rev_sha1 population row.\n" );
  52                         return false;
  53                 }
  54         }
  55
  56         protected function doSha1Updates( $db, $table, $idCol, $prefix ) {
  57                 $start = $db->selectField( $table, "MIN($idCol)", "$idCol IS NOT NULL", __METHOD__ );
  58                 if ( !$start ) {
  59                         $this->output( "Nothing to do.\n" );
  60                         return true;
  61                 }
  62                 $end = $db->selectField( $table, "MAX($idCol)", "$idCol IS NOT NULL", __METHOD__ );
  63
  64                 # Do remaining chunk
  65                 $end += $this->mBatchSize - 1;
  66                 $blockStart = $start;
  67                 $blockEnd = $start + $this->mBatchSize - 1;
  68                 while ( $blockEnd <= $end ) {
  69                         $this->output( "...doing $idCol from $blockStart to $blockEnd\n" );
  70                         $cond = "$idCol BETWEEN $blockStart AND $blockEnd
  71                                 AND $idCol IS NOT NULL AND {$prefix}_sha1 IS NOT NULL";
  72                         $res = $db->select( $table, '*', $cond, __METHOD__ );
  73
  74                         $db->begin();
  75                         foreach ( $res as $row ) {
  76                                 if ( $table === 'archive' ) {
  77                                         $rev = Revision::newFromArchiveRow( $row );
  78                                 } else {
  79                                         $rev = new Revision( $row );
  80                                 }
  81                                 $db->update( $table,
  82                                         array( "{$prefix}_sha1" => Revision::base36Sha1( $rev->getRawText() ) ),
  83                                         array( $idCol => $row->$idCol ),
  84                                         __METHOD__ );
  85                         }
  86                         $db->commit();
  87
  88                         $blockStart += $this->mBatchSize;
  89                         $blockEnd += $this->mBatchSize;
  90                         wfWaitForSlaves();
  91                 }
  92         }
  93 }
  94
  95 $maintClass = "PopulateRevisionSha1";
  96 require_once( RUN_MAINTENANCE_IF_MAIN );