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<?php
/**
* Populates the rev_len and ar_len fields when they are NULL.
*
* 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
*
* @file
* @ingroup Maintenance
*/
use Wikimedia\Rdbms\IDatabase;
require_once __DIR__ . '/Maintenance.php';
/**
* Maintenance script that populates the rev_len and ar_len fields when they are NULL.
* This is the case for all revisions created before MW 1.10, as well as those affected
* by T18748 (MW 1.10-1.13) and those affected by T135414 (MW 1.21-1.24).
*
* @ingroup Maintenance
*/
class PopulateRevisionLength extends LoggedUpdateMaintenance {
public function __construct() {
parent::__construct();
$this->addDescription( 'Populates the rev_len and ar_len fields' );
$this->setBatchSize( 200 );
}
protected function getUpdateKey() {
return 'populate rev_len and ar_len';
}
public function doDBUpdates() {
$dbw = $this->getDB( DB_MASTER );
if ( !$dbw->tableExists( 'revision' ) ) {
$this->fatalError( "revision table does not exist" );
} elseif ( !$dbw->tableExists( 'archive' ) ) {
$this->fatalError( "archive table does not exist" );
} elseif ( !$dbw->fieldExists( 'revision', 'rev_len', __METHOD__ ) ) {
$this->output( "rev_len column does not exist\n\n", true );
return false;
}
$this->output( "Populating rev_len column\n" );
$rev = $this->doLenUpdates( 'revision', 'rev_id', 'rev', Revision::getQueryInfo() );
$this->output( "Populating ar_len column\n" );
$ar = $this->doLenUpdates( 'archive', 'ar_id', 'ar', Revision::getArchiveQueryInfo() );
$this->output( "rev_len and ar_len population complete "
. "[$rev revision rows, $ar archive rows].\n" );
return true;
}
/**
* @param string $table
* @param string $idCol
* @param string $prefix
* @param array $queryInfo
* @return int
*/
protected function doLenUpdates( $table, $idCol, $prefix, $queryInfo ) {
$dbr = $this->getDB( DB_REPLICA );
$dbw = $this->getDB( DB_MASTER );
$batchSize = $this->getBatchSize();
$start = $dbw->selectField( $table, "MIN($idCol)", '', __METHOD__ );
$end = $dbw->selectField( $table, "MAX($idCol)", '', __METHOD__ );
if ( !$start || !$end ) {
$this->output( "...$table table seems to be empty.\n" );
return 0;
}
# Do remaining chunks
$blockStart = intval( $start );
$blockEnd = intval( $start ) + $batchSize - 1;
$count = 0;
while ( $blockStart <= $end ) {
$this->output( "...doing $idCol from $blockStart to $blockEnd\n" );
$res = $dbr->select(
$queryInfo['tables'],
$queryInfo['fields'],
[
"$idCol >= $blockStart",
"$idCol <= $blockEnd",
$dbr->makeList( [
"{$prefix}_len IS NULL",
$dbr->makeList( [
"{$prefix}_len = 0",
"{$prefix}_sha1 != " . $dbr->addQuotes( 'phoiac9h4m842xq45sp7s6u21eteeq1' ), // sha1( "" )
], IDatabase::LIST_AND )
], IDatabase::LIST_OR )
],
__METHOD__,
[],
$queryInfo['joins']
);
if ( $res->numRows() > 0 ) {
$this->beginTransaction( $dbw, __METHOD__ );
# Go through and update rev_len from these rows.
foreach ( $res as $row ) {
if ( $this->upgradeRow( $row, $table, $idCol, $prefix ) ) {
$count++;
}
}
$this->commitTransaction( $dbw, __METHOD__ );
}
$blockStart += $batchSize;
$blockEnd += $batchSize;
}
return $count;
}
/**
* @param stdClass $row
* @param string $table
* @param string $idCol
* @param string $prefix
* @return bool
*/
protected function upgradeRow( $row, $table, $idCol, $prefix ) {
$dbw = $this->getDB( DB_MASTER );
$rev = ( $table === 'archive' )
? Revision::newFromArchiveRow( $row )
: new Revision( $row );
$content = $rev->getContent( Revision::RAW );
if ( !$content ) {
# This should not happen, but sometimes does (T22757)
$id = $row->$idCol;
$this->output( "Content of $table $id unavailable!\n" );
return false;
}
# Update the row...
$dbw->update( $table,
[ "{$prefix}_len" => $content->getSize() ],
[ $idCol => $row->$idCol ],
__METHOD__
);
return true;
}
}
$maintClass = PopulateRevisionLength::class;
require_once RUN_MAINTENANCE_IF_MAIN;
|
