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<?php
/**
* Populates the rev_len and ar_len fields 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
*
* @file
* @ingroup Maintenance
*/
require_once __DIR__ . '/Maintenance.php';
/**
* Maintenance script that populates the rev_len and ar_len fields
* for old revisions created before MW 1.10.
*
* @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() {
$db = $this->getDB( DB_MASTER );
if ( !$db->tableExists( 'revision' ) ) {
$this->error( "revision table does not exist", true );
} elseif ( !$db->tableExists( 'archive' ) ) {
$this->error( "archive table does not exist", true );
} elseif ( !$db->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::selectFields() );
$this->output( "Populating ar_len column\n" );
$ar = $this->doLenUpdates( 'archive', 'ar_id', 'ar', Revision::selectArchiveFields() );
$this->output( "rev_len and ar_len population complete "
. "[$rev revision rows, $ar archive rows].\n" );
return true;
}
/**
* @param string $table
* @param string $idCol
* @param string $prefix
* @param array $fields
* @return int
*/
protected function doLenUpdates( $table, $idCol, $prefix, $fields ) {
$db = $this->getDB( DB_MASTER );
$start = $db->selectField( $table, "MIN($idCol)", false, __METHOD__ );
$end = $db->selectField( $table, "MAX($idCol)", false, __METHOD__ );
if ( !$start || !$end ) {
$this->output( "...$table table seems to be empty.\n" );
return 0;
}
# Do remaining chunks
$blockStart = intval( $start );
$blockEnd = intval( $start ) + $this->mBatchSize - 1;
$count = 0;
while ( $blockStart <= $end ) {
$this->output( "...doing $idCol from $blockStart to $blockEnd\n" );
$res = $db->select(
$table,
$fields,
[
"$idCol >= $blockStart",
"$idCol <= $blockEnd",
"{$prefix}_len IS NULL"
],
__METHOD__
);
$this->beginTransaction( $db, __METHOD__ );
# Go through and update rev_len from these rows.
foreach ( $res as $row ) {
if ( $this->upgradeRow( $row, $table, $idCol, $prefix ) ) {
$count++;
}
}
$this->commitTransaction( $db, __METHOD__ );
$blockStart += $this->mBatchSize;
$blockEnd += $this->mBatchSize;
wfWaitForSlaves();
}
return $count;
}
/**
* @param stdClass $row
* @param string $table
* @param string $idCol
* @param string $prefix
* @return bool
*/
protected function upgradeRow( $row, $table, $idCol, $prefix ) {
$db = $this->getDB( DB_MASTER );
$rev = ( $table === 'archive' )
? Revision::newFromArchiveRow( $row )
: new Revision( $row );
$content = $rev->getContent();
if ( !$content ) {
# This should not happen, but sometimes does (bug 20757)
$id = $row->$idCol;
$this->output( "Content of $table $id unavailable!\n" );
return false;
}
# Update the row...
$db->update( $table,
[ "{$prefix}_len" => $content->getSize() ],
[ $idCol => $row->$idCol ],
__METHOD__
);
return true;
}
}
$maintClass = "PopulateRevisionLength";
require_once RUN_MAINTENANCE_IF_MAIN;