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<?php
/**
* Populate ar_rev_id in pre-1.5 rows
*
* 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 populares archive.ar_rev_id in old rows
*
* @ingroup Maintenance
* @since 1.31
*/
class PopulateArchiveRevId extends LoggedUpdateMaintenance {
public function __construct() {
parent::__construct();
$this->addDescription( 'Populate ar_rev_id in pre-1.5 rows' );
$this->setBatchSize( 100 );
}
protected function getUpdateKey() {
return __CLASS__;
}
protected function doDBUpdates() {
$this->output( "Populating ar_rev_id...\n" );
$dbw = $this->getDB( DB_MASTER );
// Quick exit if there are no rows needing updates.
$any = $dbw->selectField(
'archive',
'ar_id',
[ 'ar_rev_id' => null ],
__METHOD__
);
if ( !$any ) {
$this->output( "Completed ar_rev_id population, 0 rows updated.\n" );
return true;
}
$rev = $this->makeDummyRevisionRow( $dbw );
$count = 0;
while ( true ) {
wfWaitForSlaves();
$arIds = $dbw->selectFieldValues(
'archive',
'ar_id',
[ 'ar_rev_id' => null ],
__METHOD__,
[ 'LIMIT' => $this->getBatchSize(), 'ORDER BY' => [ 'ar_id' ] ]
);
if ( !$arIds ) {
$this->output( "Completed ar_rev_id population, $count rows updated.\n" );
return true;
}
try {
$updates = $dbw->doAtomicSection( __METHOD__, function ( $dbw, $fname ) use ( $arIds, $rev ) {
// Create new rev_ids by inserting dummy rows into revision and then deleting them.
$dbw->insert( 'revision', array_fill( 0, count( $arIds ), $rev ), $fname );
$revIds = $dbw->selectFieldValues(
'revision',
'rev_id',
[ 'rev_timestamp' => $rev['rev_timestamp'] ],
$fname
);
if ( !is_array( $revIds ) ) {
throw new UnexpectedValueException( 'Failed to insert dummy revisions' );
}
if ( count( $revIds ) !== count( $arIds ) ) {
throw new UnexpectedValueException(
'Tried to insert ' . count( $arIds ) . ' dummy revisions, but found '
. count( $revIds ) . ' matching rows.'
);
}
$dbw->delete( 'revision', [ 'rev_id' => $revIds ], $fname );
return array_combine( $arIds, $revIds );
} );
} catch ( UnexpectedValueException $ex ) {
$this->fatalError( $ex->getMessage() );
}
foreach ( $updates as $arId => $revId ) {
$dbw->update(
'archive',
[ 'ar_rev_id' => $revId ],
[ 'ar_id' => $arId, 'ar_rev_id' => null ],
__METHOD__
);
$count += $dbw->affectedRows();
}
$min = min( array_keys( $updates ) );
$max = max( array_keys( $updates ) );
$this->output( " ... $min-$max\n" );
}
}
/**
* Construct a dummy revision table row to use for reserving IDs
*
* The row will have a wildly unlikely timestamp, and possibly a generic
* user and comment, but will otherwise be derived from a revision on the
* wiki's main page.
*
* @param IDatabase $dbw
* @return array
*/
private function makeDummyRevisionRow( IDatabase $dbw ) {
$ts = $dbw->timestamp( '11111111111111' );
$mainPage = Title::newMainPage();
if ( !$mainPage ) {
$this->fatalError( 'Main page does not exist' );
}
$pageId = $mainPage->getArticleId();
if ( !$pageId ) {
$this->fatalError( $mainPage->getPrefixedText() . ' has no ID' );
}
$rev = $dbw->selectRow(
'revision',
'*',
[ 'rev_page' => $pageId ],
__METHOD__,
[ 'ORDER BY' => 'rev_timestamp ASC' ]
);
if ( !$rev ) {
$this->fatalError( $mainPage->getPrefixedText() . ' has no revisions' );
}
unset( $rev->rev_id );
$rev = (array)$rev;
$rev['rev_timestamp'] = $ts;
if ( isset( $rev['rev_user'] ) ) {
$rev['rev_user'] = 0;
$rev['rev_user_text'] = '0.0.0.0';
}
if ( isset( $rev['rev_comment'] ) ) {
$rev['rev_comment'] = 'Dummy row';
}
$any = $dbw->selectField(
'revision',
'rev_id',
[ 'rev_timestamp' => $ts ],
__METHOD__
);
if ( $any ) {
$this->fatalError( "... Why does your database contain a revision dated $ts?" );
}
return $rev;
}
}
$maintClass = "PopulateArchiveRevId";
require_once RUN_MAINTENANCE_IF_MAIN;
|
