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<?php |
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/** |
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* Updater for link tracking tables after a page edit. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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* http://www.gnu.org/copyleft/gpl.html |
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* |
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* @file |
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*/ |
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use MediaWiki\MediaWikiServices; |
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use Wikimedia\ScopedCallback; |
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/** |
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* Update object handling the cleanup of links tables after a page was deleted. |
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**/ |
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class LinksDeletionUpdate extends DataUpdate implements EnqueueableDataUpdate { |
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/** @var WikiPage */ |
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protected $page; |
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/** @var integer */ |
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protected $pageId; |
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/** @var string */ |
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protected $timestamp; |
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/** @var IDatabase */ |
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private $db; |
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/** |
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* @param WikiPage $page Page we are updating |
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* @param integer|null $pageId ID of the page we are updating [optional] |
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* @param string|null $timestamp TS_MW timestamp of deletion |
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* @throws MWException |
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*/ |
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function __construct( WikiPage $page, $pageId = null, $timestamp = null ) { |
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parent::__construct(); |
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$this->page = $page; |
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if ( $pageId ) { |
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$this->pageId = $pageId; // page ID at time of deletion |
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} elseif ( $page->exists() ) { |
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$this->pageId = $page->getId(); |
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} else { |
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throw new InvalidArgumentException( "Page ID not known. Page doesn't exist?" ); |
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} |
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$this->timestamp = $timestamp ?: wfTimestampNow(); |
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} |
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public function doUpdate() { |
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$services = MediaWikiServices::getInstance(); |
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$config = $services->getMainConfig(); |
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$lbFactory = $services->getDBLoadBalancerFactory(); |
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$batchSize = $config->get( 'UpdateRowsPerQuery' ); |
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// Page may already be deleted, so don't just getId() |
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$id = $this->pageId; |
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if ( $this->ticket ) { |
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// Make sure all links update threads see the changes of each other. |
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// This handles the case when updates have to batched into several COMMITs. |
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$scopedLock = LinksUpdate::acquirePageLock( $this->getDB(), $id ); |
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} |
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$title = $this->page->getTitle(); |
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$dbw = $this->getDB(); // convenience |
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// Delete restrictions for it |
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$dbw->delete( 'page_restrictions', [ 'pr_page' => $id ], __METHOD__ ); |
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// Fix category table counts |
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$cats = $dbw->selectFieldValues( |
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'categorylinks', |
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'cl_to', |
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[ 'cl_from' => $id ], |
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__METHOD__ |
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); |
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$catBatches = array_chunk( $cats, $batchSize ); |
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foreach ( $catBatches as $catBatch ) { |
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$this->page->updateCategoryCounts( [], $catBatch, $id ); |
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View Code Duplication |
if ( count( $catBatches ) > 1 ) { |
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$lbFactory->commitAndWaitForReplication( |
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__METHOD__, $this->ticket, [ 'wiki' => $dbw->getWikiID() ] |
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); |
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} |
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} |
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// Refresh the category table entry if it seems to have no pages. Check |
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// master for the most up-to-date cat_pages count. |
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if ( $title->getNamespace() === NS_CATEGORY ) { |
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$row = $dbw->selectRow( |
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'category', |
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[ 'cat_id', 'cat_title', 'cat_pages', 'cat_subcats', 'cat_files' ], |
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[ 'cat_title' => $title->getDBkey(), 'cat_pages <= 0' ], |
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__METHOD__ |
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); |
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if ( $row ) { |
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Category::newFromRow( $row, $title )->refreshCounts(); |
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} |
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} |
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$this->batchDeleteByPK( |
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'pagelinks', |
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[ 'pl_from' => $id ], |
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[ 'pl_from', 'pl_namespace', 'pl_title' ], |
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$batchSize |
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); |
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$this->batchDeleteByPK( |
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'imagelinks', |
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[ 'il_from' => $id ], |
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[ 'il_from', 'il_to' ], |
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$batchSize |
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); |
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$this->batchDeleteByPK( |
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'categorylinks', |
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[ 'cl_from' => $id ], |
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[ 'cl_from', 'cl_to' ], |
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$batchSize |
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); |
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$this->batchDeleteByPK( |
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'templatelinks', |
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[ 'tl_from' => $id ], |
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[ 'tl_from', 'tl_namespace', 'tl_title' ], |
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$batchSize |
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); |
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$this->batchDeleteByPK( |
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'externallinks', |
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[ 'el_from' => $id ], |
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[ 'el_id' ], |
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$batchSize |
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); |
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$this->batchDeleteByPK( |
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'langlinks', |
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[ 'll_from' => $id ], |
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[ 'll_from', 'll_lang' ], |
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$batchSize |
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); |
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$this->batchDeleteByPK( |
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'iwlinks', |
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[ 'iwl_from' => $id ], |
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[ 'iwl_from', 'iwl_prefix', 'iwl_title' ], |
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$batchSize |
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); |
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// Delete any redirect entry or page props entries |
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$dbw->delete( 'redirect', [ 'rd_from' => $id ], __METHOD__ ); |
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$dbw->delete( 'page_props', [ 'pp_page' => $id ], __METHOD__ ); |
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// Find recentchanges entries to clean up... |
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$rcIdsForTitle = $dbw->selectFieldValues( |
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'recentchanges', |
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'rc_id', |
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[ |
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'rc_type != ' . RC_LOG, |
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'rc_namespace' => $title->getNamespace(), |
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'rc_title' => $title->getDBkey(), |
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'rc_timestamp < ' . |
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$dbw->addQuotes( $dbw->timestamp( $this->timestamp ) ) |
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], |
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__METHOD__ |
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); |
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$rcIdsForPage = $dbw->selectFieldValues( |
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'recentchanges', |
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'rc_id', |
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[ 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ], |
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__METHOD__ |
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); |
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// T98706: delete by PK to avoid lock contention with RC delete log insertions |
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$rcIdBatches = array_chunk( array_merge( $rcIdsForTitle, $rcIdsForPage ), $batchSize ); |
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foreach ( $rcIdBatches as $rcIdBatch ) { |
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$dbw->delete( 'recentchanges', [ 'rc_id' => $rcIdBatch ], __METHOD__ ); |
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View Code Duplication |
if ( count( $rcIdBatches ) > 1 ) { |
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$lbFactory->commitAndWaitForReplication( |
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__METHOD__, $this->ticket, [ 'wiki' => $dbw->getWikiID() ] |
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); |
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} |
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} |
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// Commit and release the lock (if set) |
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ScopedCallback::consume( $scopedLock ); |
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} |
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private function batchDeleteByPK( $table, array $conds, array $pk, $bSize ) { |
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$services = MediaWikiServices::getInstance(); |
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$lbFactory = $services->getDBLoadBalancerFactory(); |
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$dbw = $this->getDB(); // convenience |
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$res = $dbw->select( $table, $pk, $conds, __METHOD__ ); |
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$pkDeleteConds = []; |
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foreach ( $res as $row ) { |
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$pkDeleteConds[] = $dbw->makeList( (array)$row, LIST_AND ); |
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if ( count( $pkDeleteConds ) >= $bSize ) { |
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$dbw->delete( $table, $dbw->makeList( $pkDeleteConds, LIST_OR ), __METHOD__ ); |
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$lbFactory->commitAndWaitForReplication( |
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__METHOD__, $this->ticket, [ 'wiki' => $dbw->getWikiID() ] |
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); |
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$pkDeleteConds = []; |
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} |
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} |
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if ( $pkDeleteConds ) { |
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$dbw->delete( $table, $dbw->makeList( $pkDeleteConds, LIST_OR ), __METHOD__ ); |
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} |
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} |
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protected function getDB() { |
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if ( !$this->db ) { |
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$this->db = wfGetDB( DB_MASTER ); |
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} |
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return $this->db; |
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} |
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public function getAsJobSpecification() { |
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return [ |
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'wiki' => $this->getDB()->getWikiID(), |
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'job' => new JobSpecification( |
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'deleteLinks', |
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[ 'pageId' => $this->pageId, 'timestamp' => $this->timestamp ], |
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[ 'removeDuplicates' => true ], |
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$this->page->getTitle() |
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) |
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]; |
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} |
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} |
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Let’s assume that you have a directory layout like this:
and let’s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: