Add small HtmlCacheUpdater service class to normalize purging code

The purge() method handles purging of both file cache and CDN, using
a PRESEND deferred update. This avoids code duplication and missing
file cache purge calls.

Also:
* Migrate HTMLCacheUpdate callers to just directly using HTMLCacheUpdateJob
* Add HtmlFileCacheUpdate class and defer such updates just like with CDN
* Simplify HTMLCacheUpdate constructor parameters
* Remove BacklinkCache::clear() calls which do nothing since the backlink
  query does not actually happen until the job runs

Change-Id: Ic453b189a40109a73a9426538608eea87a76befa

RELEASE-NOTES-1.34

@@ -92,6 +92,8 @@ For notes on 1.33.x and older releases, see HISTORY.
   to add fields to Special:Mute.
 * (T100896) Skin authors can define custom OOUI themes using OOUIThemePaths.
   See <https://www.mediawiki.org/wiki/OOUI/Themes> for details.
+* The HtmlCacheUpdater service was added to unify the logic of purging CDN cache
+  and HTML file cache to simplify callers and make them more consistent.
 
 === External library changes in 1.34 ===
 
@@ -435,6 +437,7 @@ because of Phabricator reports.
 * SearchEngine::textAlreadyUpdatedForIndex() is deprecated, given the
   deprecation above this method is no longer needed/called and should not be
   implemented by SearchEngine implementation.
+* Title::purgeSquid is deprecated. Use MediaWikiServices::getHtmlCacheUpdater.
 
 === Other changes in 1.34 ===
 * …

autoload.php

@@ -642,6 +642,8 @@ $wgAutoloadLocalClasses = [
 	'Hooks' => __DIR__ . '/includes/Hooks.php',
 	'Html' => __DIR__ . '/includes/Html.php',
 	'HtmlArmor' => __DIR__ . '/includes/libs/HtmlArmor.php',
+	'HtmlCacheUpdater' => __DIR__ . '/includes/cache/HtmlCacheUpdater.php',
+	'HtmlFileCacheUpdate' => __DIR__ . '/includes/deferred/HtmlFileCacheUpdate.php',
 	'Http' => __DIR__ . '/includes/http/Http.php',
 	'HttpError' => __DIR__ . '/includes/exception/HttpError.php',
 	'HttpStatus' => __DIR__ . '/includes/libs/HttpStatus.php',

includes/MediaWikiServices.php

@@ -68,6 +68,7 @@ use Wikimedia\Services\NoSuchServiceException;
 use MediaWiki\Interwiki\InterwikiLookup;
 use MagicWordFactory;
 use MediaWiki\Storage\PageEditStash;
+use HtmlCacheUpdater;
 
 /**
  * Service locator for MediaWiki core services.
@@ -595,6 +596,14 @@ class MediaWikiServices extends ServiceContainer {
 		return $this->getService( 'GenderCache' );
 	}
 
+	/**
+	 * @return HtmlCacheUpdater
+	 * @since 1.34
+	 */
+	public function getHtmlCacheUpdater() {
+		return $this->getService( 'HtmlCacheUpdater' );
+	}
+
 	/**
 	 * @since 1.31
 	 * @return HttpRequestFactory

includes/ServiceWiring.php

@@ -218,6 +218,10 @@ return [
 		return new GenderCache( $services->getNamespaceInfo() );
 	},
 
+	'HtmlCacheUpdater' => function ( MediaWikiServices $services ) : HtmlCacheUpdater {
+		return new HtmlCacheUpdater();
+	},
+
 	'HttpRequestFactory' =>
 	function ( MediaWikiServices $services ) : HttpRequestFactory {
 		return new HttpRequestFactory();

includes/Title.php

@@ -3432,12 +3432,10 @@ class Title implements LinkTarget, IDBAccessObject {
 
 	/**
 	 * Purge all applicable CDN URLs
+	 * @deprecated 1.34 Use HtmlCacheUpdater
 	 */
 	public function purgeSquid() {
-		DeferredUpdates::addUpdate(
-			new CdnCacheUpdate( $this->getCdnUrls() ),
-			DeferredUpdates::PRESEND
-		);
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $this->getCdnUrls() );
 	}
 
 	/**
@@ -4245,12 +4243,21 @@ class Title implements LinkTarget, IDBAccessObject {
 	 * on the number of links. Typically called on create and delete.
 	 */
 	public function touchLinks() {
-		DeferredUpdates::addUpdate( new HTMLCacheUpdate( $this, 'pagelinks', 'page-touch' ) );
+		$jobs = [];
+		$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
+			$this,
+			'pagelinks',
+			[ 'causeAction' => 'page-touch' ]
+		);
 		if ( $this->mNamespace == NS_CATEGORY ) {
-			DeferredUpdates::addUpdate(
-				new HTMLCacheUpdate( $this, 'categorylinks', 'category-touch' )
+			$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
+				$this,
+				'categorylinks',
+				[ 'causeAction' => 'category-touch' ]
 			);
 		}
+
+		JobQueueGroup::singleton()->lazyPush( $jobs );
 	}
 
 	/**

includes/cache/HTMLFileCache.php

@@ -219,21 +219,33 @@ class HTMLFileCache extends FileCacheBase {
 		return $text;
 	}
 
+	/**
+	 * @param string[] $prefixedDbKeys List of prefixed DB keys for pages to purge
+	 * @since 1.34
+	 */
+	public static function purge( array $prefixedDbKeys ) {
+		foreach ( $prefixedDbKeys as $prefixedDbKey ) {
+			foreach ( self::cacheablePageActions() as $type ) {
+				$fc = new self( $prefixedDbKey, $type );
+				$fc->clearCache();
+			}
+		}
+	}
+
 	/**
 	 * Clear the file caches for a page for all actions
-	 * @param Title $title
+	 * @param Traversable|Title[]|Title $titles
 	 * @return bool Whether $wgUseFileCache is enabled
 	 */
-	public static function clearFileCache( Title $title ) {
+	public static function clearFileCache( $titles ) {
 		$config = MediaWikiServices::getInstance()->getMainConfig();
-
 		if ( !$config->get( 'UseFileCache' ) ) {
 			return false;
 		}
 
-		foreach ( self::cacheablePageActions() as $type ) {
-			$fc = new self( $title, $type );
-			$fc->clearCache();
+		$titleIterator = ( $titles instanceof Title ) ? [ $titles ] : $titles;
+		foreach ( $titleIterator as $title ) {
+			self::purge( [ $title->getPrefixedDBkey() ] );
 		}
 
 		return true;

includes/cache/HtmlCacheUpdater.php

@@ -0,0 +1,94 @@
+<?php
+/**
+ * HTML/file cache invalidation of cacheable variant/action URLs for a page
+ *
+ * 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 Cache
+ */
+
+/**
+ * Class to invalidate the HTML/file cache of cacheable variant/action URLs for a page
+ *
+ * @ingroup Cache
+ * @since 1.34
+ */
+class HtmlCacheUpdater {
+	/** @var int Purge after the main transaction round and respect $wgCdnReboundPurgeDelay */
+	const ISOLATION_AND_LAG_AWARE = 1;
+	/** @var int Purge immediately and only once (ignore $wgCdnReboundPurgeDelay) */
+	const IMMEDIATE_WITHOUT_REBOUND = 2;
+
+	/**
+	 * Purge CDN/HTMLFileCache for a URL, Title, or iteratable of URL or Title entries
+	 *
+	 * String entries will be treated as URLs to be purged from the CDN layer.
+	 * For Title entries, all cacheable canonical URLs associated with the page
+	 * will be purged from the CDN and HTMLFileCache.
+	 *
+	 * The cache purges are queued as PRESEND deferred updates so that they run after the
+	 * main database transaction round of LBFactory. This reduces the chance of race conditions
+	 * where a stale value is re-populated before commit. Depending on $wgCdnReboundPurgeDelay,
+	 * a secondary set of purges might be issued several seconds later through the use of a
+	 * delayed job. This is used to mitigate the effects of DB replication lag as well as
+	 * multiple layers of CDN proxies. All deferred CDN purges are combined and de-duplicated
+	 * into a single DeferrableUpdate instance. This improves HTTP PURGE request pipelining.
+	 *
+	 * Use the IMMEDIATE_WITHOUT_REBOUND class constant to instantly issue the purges instead
+	 * and skip the use of any secondary purges regardless of $wgCdnReboundPurgeDelay.
+	 *
+	 * @param Traversable|Title[]|Title|string[]|string $entries
+	 * @param int $mode ISOLATION_AND_LAG_AWARE or IMMEDIATE_WITHOUT_REBOUND class constant
+	 */
+	public function purge( $entries, $mode = self::ISOLATION_AND_LAG_AWARE ) {
+		$urls = [];
+		$titles = [];
+		if ( is_string( $entries ) ) {
+			$urls = [ $entries ];
+		} elseif ( $entries instanceof Title ) {
+			$titles = [ $entries ];
+		} elseif ( $entries instanceof TitleArray ) {
+			$titles = $entries; // save memory
+		} else {
+			foreach ( $entries as $entry ) {
+				if ( is_string( $entry ) ) {
+					$urls[] = $entry;
+				} else {
+					$titles[] = $entry;
+				}
+			}
+		}
+
+		if ( $mode === self::IMMEDIATE_WITHOUT_REBOUND ) {
+			HTMLFileCache::clearFileCache( $titles );
+			foreach ( $titles as $title ) {
+				/** @var Title $title */
+				$urls = array_merge( $urls, $title->getCdnUrls() );
+			}
+			CdnCacheUpdate::purge( $urls ); // purge once (no "rebound" purges)
+		} else {
+			DeferredUpdates::addUpdate(
+				HtmlFileCacheUpdate::newFromTitles( $titles ),
+				DeferredUpdates::PRESEND
+			);
+			DeferredUpdates::addUpdate(
+				CdnCacheUpdate::newFromTitles( $titles, $urls ),
+				DeferredUpdates::PRESEND
+			);
+		}
+	}
+}

includes/deferred/CdnCacheUpdate.php

@@ -24,12 +24,12 @@ use Wikimedia\Assert\Assert;
 use MediaWiki\MediaWikiServices;
 
 /**
- * Handles purging appropriate CDN URLs given a title (or titles)
+ * Handles purging the appropriate CDN objects given a list of URLs or Title instances
  * @ingroup Cache
  */
 class CdnCacheUpdate implements DeferrableUpdate, MergeableUpdate {
 	/** @var string[] Collection of URLs to purge */
-	protected $urls = [];
+	private $urls = [];
 
 	/**
 	 * @param string[] $urlArr Collection of URLs to purge
@@ -59,12 +59,9 @@ class CdnCacheUpdate implements DeferrableUpdate, MergeableUpdate {
 			$urlArr = array_merge( $urlArr, $title->getCdnUrls() );
 		}
 
-		return new CdnCacheUpdate( $urlArr );
+		return new self( $urlArr );
 	}
 
-	/**
-	 * Purges the list of URLs passed to the constructor.
-	 */
 	public function doUpdate() {
 		global $wgCdnReboundPurgeDelay;
 
@@ -98,10 +95,9 @@ class CdnCacheUpdate implements DeferrableUpdate, MergeableUpdate {
 		wfDebugLog( 'squid', __METHOD__ . ': ' . implode( ' ', $urlArr ) );
 
 		// Reliably broadcast the purge to all edge nodes
-		$relayer = MediaWikiServices::getInstance()->getEventRelayerGroup()
-					->getRelayer( 'cdn-url-purges' );
 		$ts = microtime( true );
-		$relayer->notifyMulti(
+		$relayerGroup = MediaWikiServices::getInstance()->getEventRelayerGroup();
+		$relayerGroup->getRelayer( 'cdn-url-purges' )->notifyMulti(
 			'cdn-url-purges',
 			array_map(
 				function ( $url ) use ( $ts ) {

includes/deferred/HTMLCacheUpdate.php

@@ -22,39 +22,32 @@
  */
 
 /**
- * Class to invalidate the HTML cache of all the pages linking to a given title.
+ * Class to invalidate the HTML/file cache of all the pages linking to a given title.
  *
  * @ingroup Cache
+ * @deprecated Since 1.34; Enqueue jobs from HTMLCacheUpdateJob::newForBacklinks instead
  */
 class HTMLCacheUpdate extends DataUpdate {
 	/** @var Title */
-	public $mTitle;
-
+	private $title;
 	/** @var string */
-	public $mTable;
+	private $table;
 
 	/**
-	 * @param Title $titleTo
+	 * @param Title $title
 	 * @param string $table
-	 * @param string $causeAction Triggering action
-	 * @param string $causeAgent Triggering user
 	 */
-	function __construct(
-		Title $titleTo, $table, $causeAction = 'unknown', $causeAgent = 'unknown'
-	) {
-		$this->mTitle = $titleTo;
-		$this->mTable = $table;
-		$this->causeAction = $causeAction;
-		$this->causeAgent = $causeAgent;
+	public function __construct( Title $title, $table ) {
+		$this->title = $title;
+		$this->table = $table;
 	}
 
 	public function doUpdate() {
 		$job = HTMLCacheUpdateJob::newForBacklinks(
-			$this->mTitle,
-			$this->mTable,
+			$this->title,
+			$this->table,
 			[ 'causeAction' => $this->getCauseAction(), 'causeAgent' => $this->getCauseAgent() ]
 		);
-
 		JobQueueGroup::singleton()->lazyPush( $job );
 	}
 }

includes/deferred/HtmlFileCacheUpdate.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * HTMLFileCache cache purging
+ *
+ * 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
+ */
+
+use MediaWiki\MediaWikiServices;
+
+/**
+ * Handles purging the appropriate HTMLFileCache files given a list of titles
+ * @ingroup Cache
+ */
+class HtmlFileCacheUpdate implements DeferrableUpdate {
+	/** @var string[] Collection of prefixed DB keys for the pages to purge */
+	private $prefixedDbKeys = [];
+
+	/**
+	 * @param string[] $prefixedDbKeys
+	 */
+	public function __construct( array $prefixedDbKeys ) {
+		$this->prefixedDbKeys = $prefixedDbKeys;
+	}
+
+	/**
+	 * Create an update object from an array of Title objects, or a TitleArray object
+	 *
+	 * @param Traversable|Title[] $titles
+	 * @return HtmlFileCacheUpdate
+	 */
+	public static function newFromTitles( $titles ) {
+		$prefixedDbKeys = [];
+		foreach ( $titles as $title ) {
+			$prefixedDbKeys[] = $title->getPrefixedDBkey();
+		}
+
+		return new self( $prefixedDbKeys );
+	}
+
+	public function doUpdate() {
+		$config = MediaWikiServices::getInstance()->getMainConfig();
+		if ( $config->get( 'UseFileCache' ) ) {
+			HTMLFileCache::purge( $this->prefixedDbKeys );
+		}
+	}
+}

includes/deferred/LinksUpdate.php

@@ -1066,6 +1066,7 @@ class LinksUpdate extends DataUpdate {
 	private function invalidateProperties( $changed ) {
 		global $wgPagePropLinkInvalidations;
 
+		$jobs = [];
 		foreach ( $changed as $name => $value ) {
 			if ( isset( $wgPagePropLinkInvalidations[$name] ) ) {
 				$inv = $wgPagePropLinkInvalidations[$name];
@@ -1073,12 +1074,16 @@ class LinksUpdate extends DataUpdate {
 					$inv = [ $inv ];
 				}
 				foreach ( $inv as $table ) {
-					DeferredUpdates::addUpdate(
-						new HTMLCacheUpdate( $this->mTitle, $table, 'page-props' )
+					$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
+						$this->mTitle,
+						$table,
+						[ 'causeAction' => 'page-props' ]
 					);
 				}
 			}
 		}
+
+		JobQueueGroup::singleton()->lazyPush( $jobs );
 	}
 
 	/**

includes/filerepo/file/File.php

@@ -1453,7 +1453,7 @@ abstract class File implements IDBAccessObject {
 		$title = $this->getTitle();
 		if ( $title ) {
 			$title->invalidateCache();
-			$title->purgeSquid();
+			MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $title );
 		}
 	}
 
@@ -1469,9 +1469,12 @@ abstract class File implements IDBAccessObject {
 		// Purge cache of all pages using this file
 		$title = $this->getTitle();
 		if ( $title ) {
-			DeferredUpdates::addUpdate(
-				new HTMLCacheUpdate( $title, 'imagelinks', 'file-purge' )
+			$job = HTMLCacheUpdateJob::newForBacklinks(
+				$title,
+				'imagelinks',
+				[ 'causeAction' => 'file-purge' ]
 			);
+			JobQueueGroup::singleton()->lazyPush( $job );
 		}
 	}
 

includes/filerepo/file/LocalFile.php

@@ -1047,10 +1047,7 @@ class LocalFile extends File {
 		$this->purgeThumbnails( $options );
 
 		// Purge CDN cache for this file
-		DeferredUpdates::addUpdate(
-			new CdnCacheUpdate( [ $this->getUrl() ] ),
-			DeferredUpdates::PRESEND
-		);
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $this->getUrl() );
 	}
 
 	/**
@@ -1073,7 +1070,7 @@ class LocalFile extends File {
 		foreach ( $files as $file ) {
 			$urls[] = $this->getArchiveThumbUrl( $archiveName, $file );
 		}
-		DeferredUpdates::addUpdate( new CdnCacheUpdate( $urls ), DeferredUpdates::PRESEND );
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $urls );
 	}
 
 	/**
@@ -1105,7 +1102,7 @@ class LocalFile extends File {
 		$this->purgeThumbList( $dir, $files );
 
 		// Purge the CDN
-		DeferredUpdates::addUpdate( new CdnCacheUpdate( $urls ), DeferredUpdates::PRESEND );
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $urls );
 	}
 
 	/**
@@ -1725,8 +1722,9 @@ class LocalFile extends File {
 						}
 					} else {
 						# Existing file page: invalidate description page cache
-						$wikiPage->getTitle()->invalidateCache();
-						$wikiPage->getTitle()->purgeSquid();
+						$title = $wikiPage->getTitle();
+						$title->invalidateCache();
+						MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $title );
 						# Allow the new file version to be patrolled from the page footer
 						Article::purgePatrolFooterCache( $descId );
 					}
@@ -1774,10 +1772,8 @@ class LocalFile extends File {
 						# Delete old thumbnails
 						$this->purgeThumbnails();
 						# Remove the old file from the CDN cache
-						DeferredUpdates::addUpdate(
-							new CdnCacheUpdate( [ $this->getUrl() ] ),
-							DeferredUpdates::PRESEND
-						);
+						MediaWikiServices::getInstance()
+							->getHtmlCacheUpdater()->purge( $this->getUrl() );
 					} else {
 						# Update backlink pages pointing to this title if created
 						LinksUpdate::queueRecursiveJobsForTable(
@@ -1800,9 +1796,12 @@ class LocalFile extends File {
 		}
 
 		# Invalidate cache for all pages using this file
-		DeferredUpdates::addUpdate(
-			new HTMLCacheUpdate( $this->getTitle(), 'imagelinks', 'file-upload' )
+		$job = HTMLCacheUpdateJob::newForBacklinks(
+			$this->getTitle(),
+			'imagelinks',
+			[ 'causeAction' => 'file-upload', 'causeAgent' => $user->getName() ]
 		);
+		JobQueueGroup::singleton()->lazyPush( $job );
 
 		return Status::newGood();
 	}
@@ -2004,7 +2003,7 @@ class LocalFile extends File {
 		foreach ( $archiveNames as $archiveName ) {
 			$purgeUrls[] = $this->getArchiveUrl( $archiveName );
 		}
-		DeferredUpdates::addUpdate( new CdnCacheUpdate( $purgeUrls ), DeferredUpdates::PRESEND );
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $purgeUrls );
 
 		return $status;
 	}
@@ -2041,10 +2040,8 @@ class LocalFile extends File {
 			$this->purgeDescription();
 		}
 
-		DeferredUpdates::addUpdate(
-			new CdnCacheUpdate( [ $this->getArchiveUrl( $archiveName ) ] ),
-			DeferredUpdates::PRESEND
-		);
+		$url = $this->getArchiveUrl( $archiveName );
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $url );
 
 		return $status;
 	}

includes/jobqueue/jobs/HTMLCacheUpdateJob.php

@@ -25,7 +25,7 @@
 use MediaWiki\MediaWikiServices;
 
 /**
- * Job to purge the cache for all pages that link to or use another page or file
+ * Job to purge the HTML/file cache for all pages that link to or use another page or file
  *
  * This job comes in a few variants:
  *   - a) Recursive jobs to purge caches for backlink pages for a given title.
@@ -110,7 +110,7 @@ class HTMLCacheUpdateJob extends Job {
 	 * @param array $pages Map of (page ID => (namespace, DB key)) entries
 	 */
 	protected function invalidateTitles( array $pages ) {
-		global $wgUpdateRowsPerQuery, $wgUseFileCache, $wgPageLanguageUseDB;
+		global $wgUpdateRowsPerQuery, $wgPageLanguageUseDB;
 
 		// Get all page IDs in this query into an array
 		$pageIds = array_keys( $pages );
@@ -160,20 +160,11 @@ class HTMLCacheUpdateJob extends Job {
 			__METHOD__
 		) );
 
-		// Update CDN; call purge() directly so as to not bother with secondary purges
-		$urls = [];
-		foreach ( $titleArray as $title ) {
-			/** @var Title $title */
-			$urls = array_merge( $urls, $title->getCdnUrls() );
-		}
-		CdnCacheUpdate::purge( $urls );
-
-		// Update file cache
-		if ( $wgUseFileCache ) {
-			foreach ( $titleArray as $title ) {
-				HTMLFileCache::clearFileCache( $title );
-			}
-		}
+		// Update CDN and file caches (avoiding secondary purge overhead)
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge(
+			$titleArray,
+			HtmlCacheUpdater::IMMEDIATE_WITHOUT_REBOUND
+		);
 	}
 
 	public function getDeduplicationInfo() {

includes/page/PageArchive.php

@@ -756,10 +756,14 @@ class PageArchive {
 
 			Hooks::run( 'ArticleUndelete',
 				[ &$this->title, $created, $comment, $oldPageId, $restoredPages ] );
+
 			if ( $this->title->getNamespace() == NS_FILE ) {
-				DeferredUpdates::addUpdate(
-					new HTMLCacheUpdate( $this->title, 'imagelinks', 'file-restore' )
+				$job = HTMLCacheUpdateJob::newForBacklinks(
+					$this->title,
+					'imagelinks',
+					[ 'causeAction' => 'imagelinks', 'causeAgent' => 'file-restore' ]
 				);
+				JobQueueGroup::singleton()->lazyPush( $job );
 			}
 		}
 

includes/page/WikiFilePage.php

@@ -176,9 +176,12 @@ class WikiFilePage extends WikiPage {
 
 		if ( $this->mFile->exists() ) {
 			wfDebug( 'ImagePage::doPurge purging ' . $this->mFile->getName() . "\n" );
-			DeferredUpdates::addUpdate(
-				new HTMLCacheUpdate( $this->mTitle, 'imagelinks', 'file-purge' )
+			$job = HTMLCacheUpdateJob::newForBacklinks(
+				$this->mTitle,
+				'imagelinks',
+				[ 'causeAction' => 'file-purge' ]
 			);
+			JobQueueGroup::singleton()->lazyPush( $job );
 		} else {
 			wfDebug( 'ImagePage::doPurge no image for '
 				. $this->mFile->getName() . "; limiting purge to cache only\n" );

includes/page/WikiPage.php

@@ -1294,13 +1294,8 @@ class WikiPage implements Page, IDBAccessObject {
 
 		$this->mTitle->invalidateCache();
 
-		// Clear file cache
-		HTMLFileCache::clearFileCache( $this->getTitle() );
-		// Send purge after above page_touched update was committed
-		DeferredUpdates::addUpdate(
-			new CdnCacheUpdate( $this->mTitle->getCdnUrls() ),
-			DeferredUpdates::PRESEND
-		);
+		// Clear file cache and send purge after above page_touched update was committed
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $this->mTitle );
 
 		if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 			$messageCache = MessageCache::singleton();
@@ -3384,18 +3379,20 @@ class WikiPage implements Page, IDBAccessObject {
 		// Update existence markers on article/talk tabs...
 		$other = $title->getOtherPage();
 
-		$other->purgeSquid();
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( [ $title, $other ] );
 
 		$title->touchLinks();
-		$title->purgeSquid();
 		$title->deleteTitleProtection();
 
 		MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
 
 		// Invalidate caches of articles which include this page
-		DeferredUpdates::addUpdate(
-			new HTMLCacheUpdate( $title, 'templatelinks', 'page-create' )
+		$job = HTMLCacheUpdateJob::newForBacklinks(
+			$title,
+			'templatelinks',
+			[ 'causeAction' => 'page-create' ]
 		);
+		JobQueueGroup::singleton()->lazyPush( $job );
 
 		if ( $title->getNamespace() == NS_CATEGORY ) {
 			// Load the Category object, which will schedule a job to create
@@ -3415,19 +3412,14 @@ class WikiPage implements Page, IDBAccessObject {
 		// TODO: move this into a PageEventEmitter service
 
 		// Update existence markers on article/talk tabs...
-		// Clear Backlink cache first so that purge jobs use more up-to-date backlink information
-		BacklinkCache::get( $title )->clear();
 		$other = $title->getOtherPage();
 
-		$other->purgeSquid();
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( [ $title, $other ] );
 
 		$title->touchLinks();
-		$title->purgeSquid();
 
 		MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
 
-		// File cache
-		HTMLFileCache::clearFileCache( $title );
 		InfoAction::invalidateCache( $title );
 
 		// Messages
@@ -3437,9 +3429,12 @@ class WikiPage implements Page, IDBAccessObject {
 
 		// Images
 		if ( $title->getNamespace() == NS_FILE ) {
-			DeferredUpdates::addUpdate(
-				new HTMLCacheUpdate( $title, 'imagelinks', 'page-delete' )
+			$job = HTMLCacheUpdateJob::newForBacklinks(
+				$title,
+				'imagelinks',
+				[ 'causeAction' => 'page-delete' ]
 			);
+			JobQueueGroup::singleton()->lazyPush( $job );
 		}
 
 		// User talk pages
@@ -3472,26 +3467,28 @@ class WikiPage implements Page, IDBAccessObject {
 	) {
 		// TODO: move this into a PageEventEmitter service
 
-		if ( $slotsChanged === null || in_array( SlotRecord::MAIN,  $slotsChanged ) ) {
+		$jobs = [];
+		if ( $slotsChanged === null || in_array( SlotRecord::MAIN, $slotsChanged ) ) {
 			// Invalidate caches of articles which include this page.
 			// Only for the main slot, because only the main slot is transcluded.
 			// TODO: MCR: not true for TemplateStyles! [SlotHandler]
-			DeferredUpdates::addUpdate(
-				new HTMLCacheUpdate( $title, 'templatelinks', 'page-edit' )
+			$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
+				$title,
+				'templatelinks',
+				[ 'causeAction' => 'page-edit' ]
 			);
 		}
-
 		// Invalidate the caches of all pages which redirect here
-		DeferredUpdates::addUpdate(
-			new HTMLCacheUpdate( $title, 'redirect', 'page-edit' )
+		$jobs[] = HTMLCacheUpdateJob::newForBacklinks(
+			$title,
+			'redirect',
+			[ 'causeAction' => 'page-edit' ]
 		);
+		JobQueueGroup::singleton()->lazyPush( $jobs );
 
 		MediaWikiServices::getInstance()->getLinkCache()->invalidateTitle( $title );
 
-		// Purge CDN for this page only
-		$title->purgeSquid();
-		// Clear file cache for this page only
-		HTMLFileCache::clearFileCache( $title );
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $title );
 
 		// Purge ?action=info cache
 		$revid = $revision ? $revision->getId() : null;

includes/revisiondelete/RevDelFileList.php

@@ -122,10 +122,7 @@ class RevDelFileList extends RevDelList {
 			$file->purgeOldThumbnails( $archiveName );
 			$purgeUrls[] = $file->getArchiveUrl( $archiveName );
 		}
-		DeferredUpdates::addUpdate(
-			new CdnCacheUpdate( $purgeUrls ),
-			DeferredUpdates::PRESEND
-		);
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $purgeUrls );
 
 		return Status::newGood();
 	}

includes/revisiondelete/RevDelRevisionList.php

@@ -19,6 +19,7 @@
  * @ingroup RevisionDelete
  */
 
+use MediaWiki\MediaWikiServices;
 use MediaWiki\Storage\RevisionRecord;
 use Wikimedia\Rdbms\FakeResultWrapper;
 use Wikimedia\Rdbms\IDatabase;
@@ -177,9 +178,10 @@ class RevDelRevisionList extends RevDelList {
 	}
 
 	public function doPostCommitUpdates( array $visibilityChangeMap ) {
-		$this->title->purgeSquid();
+		MediaWikiServices::getInstance()->getHtmlCacheUpdater()->purge( $this->title );
 		// Extensions that require referencing previous revisions may need this
-		Hooks::run( 'ArticleRevisionVisibilitySet', [ $this->title, $this->ids, $visibilityChangeMap ] );
+		Hooks::run( 'ArticleRevisionVisibilitySet',
+			[ $this->title, $this->ids, $visibilityChangeMap ] );
 		return Status::newGood();
 	}
 }