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<?php
/**
* Updater for link tracking tables after a page edit.
*
* 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
*/
namespace MediaWiki\Deferred\LinksUpdate;
use InvalidArgumentException;
use JobSpecification;
use MediaWiki\Category\Category;
use MediaWiki\Deferred\DeferredUpdates;
use MediaWiki\Deferred\EnqueueableDataUpdate;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Page\PageIdentity;
use MediaWiki\Page\PageIdentityValue;
use MediaWiki\Parser\ParserOutput;
/**
* Update object handling the cleanup of links tables after a page was deleted.
*/
class LinksDeletionUpdate extends LinksUpdate implements EnqueueableDataUpdate {
/** @var string */
protected $timestamp;
/**
* @param PageIdentity $page Page we are updating
* @param int|null $pageId ID of the page we are updating [optional]
* @param string|null $timestamp TS_MW timestamp of deletion
*/
public function __construct( PageIdentity $page, $pageId = null, $timestamp = null ) {
if ( $pageId ) {
$this->mId = $pageId; // page ID at time of deletion
} elseif ( $page->exists() ) {
$this->mId = $page->getId();
} else {
throw new InvalidArgumentException( "Page ID not known. Page doesn't exist?" );
}
$this->timestamp = $timestamp ?: wfTimestampNow();
$fakePO = new ParserOutput();
$fakePO->setCacheTime( $timestamp );
// Use an immutable page identity to keep reference to the page id at time of deletion - T299244
$immutablePageIdentity = new PageIdentityValue(
$page->getId(),
$page->getNamespace(),
$page->getDBkey(),
$page->getWikiId()
);
parent::__construct( $immutablePageIdentity, $fakePO, false );
}
protected function doIncrementalUpdate() {
$services = MediaWikiServices::getInstance();
$config = $services->getMainConfig();
$dbProvider = $services->getConnectionProvider();
$batchSize = $config->get( MainConfigNames::UpdateRowsPerQuery );
$id = $this->mId;
$title = $this->mTitle;
$dbw = $this->getDB(); // convenience
parent::doIncrementalUpdate();
// Typically, a category is empty when deleted, so check that we don't leave
// spurious row in the category table.
if ( $title->getNamespace() === NS_CATEGORY ) {
// T166757: do the update after the main job DB commit
DeferredUpdates::addCallableUpdate( static function () use ( $title ) {
$cat = Category::newFromName( $title->getDBkey() );
$cat->refreshCountsIfSmall();
} );
}
// Delete restrictions for the deleted page
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'page_restrictions' )
->where( [ 'pr_page' => $id ] )
->caller( __METHOD__ )->execute();
// Delete any redirect entry
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'redirect' )
->where( [ 'rd_from' => $id ] )
->caller( __METHOD__ )->execute();
// Find recentchanges entries to clean up...
// Select RC IDs just by curid, and not by title (see T307865 and T140960)
$rcIdsForPage = $dbw->newSelectQueryBuilder()
->select( 'rc_id' )
->from( 'recentchanges' )
->where( [ $dbw->expr( 'rc_type', '!=', RC_LOG ), 'rc_cur_id' => $id ] )
->caller( __METHOD__ )->fetchFieldValues();
// T98706: delete by PK to avoid lock contention with RC delete log insertions
$rcIdBatches = array_chunk( $rcIdsForPage, $batchSize );
foreach ( $rcIdBatches as $rcIdBatch ) {
$dbw->newDeleteQueryBuilder()
->deleteFrom( 'recentchanges' )
->where( [ 'rc_id' => $rcIdBatch ] )
->caller( __METHOD__ )->execute();
if ( count( $rcIdBatches ) > 1 ) {
$dbProvider->commitAndWaitForReplication(
__METHOD__, $this->ticket, [ 'domain' => $dbw->getDomainID() ]
);
}
}
}
public function getAsJobSpecification() {
return [
'domain' => $this->getDB()->getDomainID(),
'job' => new JobSpecification(
'deleteLinks',
[ 'pageId' => $this->mId, 'timestamp' => $this->timestamp ],
[ 'removeDuplicates' => true ],
$this->mTitle
)
];
}
}
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