1 files changed, 105 insertions, 0 deletions
diff --git a/includes/deferred/LinksDeletionUpdate.php b/includes/deferred/LinksDeletionUpdate.php
new file mode 100644
index 00000000..bbdfcf17
--- /dev/null
+++ b/includes/deferred/LinksDeletionUpdate.php
@@ -0,0 +1,105 @@
+<?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
+ */
+
+/**
+ * Update object handling the cleanup of links tables after a page was deleted.
+ **/
+class LinksDeletionUpdate extends SqlDataUpdate {
+	/** @var WikiPage The WikiPage that was deleted */
+	protected $mPage;
+
+	/**
+	 * Constructor
+	 *
+	 * @param WikiPage $page Page we are updating
+	 * @throws MWException
+	 */
+	function __construct( WikiPage $page ) {
+		parent::__construct( false ); // no implicit transaction
+
+		$this->mPage = $page;
+
+		if ( !$page->exists() ) {
+			throw new MWException( "Page ID not known, perhaps the page doesn't exist?" );
+		}
+	}
+
+	/**
+	 * Do some database updates after deletion
+	 */
+	public function doUpdate() {
+		$title = $this->mPage->getTitle();
+		$id = $this->mPage->getId();
+
+		# Delete restrictions for it
+		$this->mDb->delete( 'page_restrictions', array( 'pr_page' => $id ), __METHOD__ );
+
+		# Fix category table counts
+		$cats = array();
+		$res = $this->mDb->select( 'categorylinks', 'cl_to', array( 'cl_from' => $id ), __METHOD__ );
+
+		foreach ( $res as $row ) {
+			$cats[] = $row->cl_to;
+		}
+
+		$this->mPage->updateCategoryCounts( array(), $cats );
+
+		# If using cascading deletes, we can skip some explicit deletes
+		if ( !$this->mDb->cascadingDeletes() ) {
+			# Delete outgoing links
+			$this->mDb->delete( 'pagelinks', array( 'pl_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'imagelinks', array( 'il_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'categorylinks', array( 'cl_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'templatelinks', array( 'tl_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'externallinks', array( 'el_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'langlinks', array( 'll_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'iwlinks', array( 'iwl_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'redirect', array( 'rd_from' => $id ), __METHOD__ );
+			$this->mDb->delete( 'page_props', array( 'pp_page' => $id ), __METHOD__ );
+		}
+
+		# If using cleanup triggers, we can skip some manual deletes
+		if ( !$this->mDb->cleanupTriggers() ) {
+			# Find recentchanges entries to clean up...
+			$rcIdsForTitle = $this->mDb->selectFieldValues( 'recentchanges',
+				'rc_id',
+				array(
+					'rc_type != ' . RC_LOG,
+					'rc_namespace' => $title->getNamespace(),
+					'rc_title' => $title->getDBkey()
+				),
+				__METHOD__
+			);
+			$rcIdsForPage = $this->mDb->selectFieldValues( 'recentchanges',
+				'rc_id',
+				array( 'rc_type != ' . RC_LOG, 'rc_cur_id' => $id ),
+				__METHOD__
+			);
+
+			# T98706: delete PK to avoid lock contention with RC delete log insertions
+			$rcIds = array_merge( $rcIdsForTitle, $rcIdsForPage );
+			if ( $rcIds ) {
+				$this->mDb->delete( 'recentchanges', array( 'rc_id' => $rcIds ), __METHOD__ );
+			}
+		}
+	}
+}
+\ No newline at end of file