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<?php
/**
* Populates the rev_len field for old revisions created before MW 1.10.
*
* 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
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @ingroup Maintenance
*/
require_once( dirname( __FILE__ ) . '/Maintenance.php' );
class PopulateRevisionLength extends LoggedUpdateMaintenance {
public function __construct() {
parent::__construct();
$this->mDescription = "Populates the rev_len field";
$this->setBatchSize( 200 );
}
protected function getUpdateKey() {
return 'populate rev_len';
}
protected function updateSkippedMessage() {
return 'rev_len column of revision table already populated.';
}
public function doDBUpdates() {
$db = $this->getDB( DB_MASTER );
if ( !$db->tableExists( 'revision' ) ) {
$this->error( "revision table does not exist", true );
}
$this->output( "Populating rev_len column\n" );
$start = $db->selectField( 'revision', 'MIN(rev_id)', false, __METHOD__ );
$end = $db->selectField( 'revision', 'MAX(rev_id)', false, __METHOD__ );
if ( !$start || !$end ) {
$this->output( "...revision table seems to be empty.\n" );
return true;
}
# Do remaining chunks
$blockStart = intval( $start );
$blockEnd = intval( $start ) + $this->mBatchSize - 1;
$count = 0;
$missing = 0;
while ( $blockStart <= $end ) {
$this->output( "...doing rev_id from $blockStart to $blockEnd\n" );
$res = $db->select( 'revision',
Revision::selectFields(),
array( "rev_id >= $blockStart",
"rev_id <= $blockEnd",
"rev_len IS NULL" ),
__METHOD__ );
# Go through and update rev_len from these rows.
foreach ( $res as $row ) {
$rev = new Revision( $row );
$text = $rev->getRawText();
if ( !is_string( $text ) ) {
# This should not happen, but sometimes does (bug 20757)
$this->output( "Text of revision {$row->rev_id} unavailable!\n" );
$missing++;
}
else {
# Update the row...
$db->update( 'revision',
array( 'rev_len' => strlen( $text ) ),
array( 'rev_id' => $row->rev_id ),
__METHOD__ );
$count++;
}
}
$blockStart += $this->mBatchSize;
$blockEnd += $this->mBatchSize;
wfWaitForSlaves();
}
$this->output( "rev_len population complete ... {$count} rows changed ({$missing} missing)\n" );
return true;
}
}
$maintClass = "PopulateRevisionLength";
require_once( RUN_MAINTENANCE_IF_MAIN );
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