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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | use MediaWiki\MainConfigNames; |
| 22 | use MediaWiki\MediaWikiServices; |
| 23 | use MediaWiki\Page\PageIdentity; |
| 24 | use MediaWiki\Revision\RevisionRecord; |
| 25 | use MediaWiki\Revision\RevisionStoreRecord; |
| 26 | use MediaWiki\Title\Title; |
| 27 | use Wikimedia\Rdbms\LBFactory; |
| 28 | use Wikimedia\Rdbms\SelectQueryBuilder; |
| 29 | |
| 30 | /** |
| 31 | * Job to add recent change entries mentioning category membership changes |
| 32 | * |
| 33 | * This allows users to easily scan categories for recent page membership changes |
| 34 | * |
| 35 | * Parameters include: |
| 36 | * - pageId : page ID |
| 37 | * - revTimestamp : timestamp of the triggering revision |
| 38 | * |
| 39 | * Category changes will be mentioned for revisions at/after the timestamp for this page |
| 40 | * |
| 41 | * @since 1.27 |
| 42 | * @ingroup JobQueue |
| 43 | */ |
| 44 | class CategoryMembershipChangeJob extends Job { |
| 45 | /** @var int|null */ |
| 46 | private $ticket; |
| 47 | |
| 48 | private const ENQUEUE_FUDGE_SEC = 60; |
| 49 | |
| 50 | /** |
| 51 | * @param PageIdentity $page the page for which to update category membership. |
| 52 | * @param string $revisionTimestamp The timestamp of the new revision that triggered the job. |
| 53 | * @return JobSpecification |
| 54 | */ |
| 55 | public static function newSpec( PageIdentity $page, $revisionTimestamp ) { |
| 56 | return new JobSpecification( |
| 57 | 'categoryMembershipChange', |
| 58 | [ |
| 59 | 'pageId' => $page->getId(), |
| 60 | 'revTimestamp' => $revisionTimestamp, |
| 61 | ], |
| 62 | [ |
| 63 | 'removeDuplicates' => true, |
| 64 | 'removeDuplicatesIgnoreParams' => [ 'revTimestamp' ] |
| 65 | ], |
| 66 | $page |
| 67 | ); |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Constructor for use by the Job Queue infrastructure. |
| 72 | * @note Don't call this when queueing a new instance, use newSpec() instead. |
| 73 | * @param PageIdentity $page the categorized page. |
| 74 | * @param array $params Such latest revision instance of the categorized page. |
| 75 | */ |
| 76 | public function __construct( PageIdentity $page, array $params ) { |
| 77 | parent::__construct( 'categoryMembershipChange', $page, $params ); |
| 78 | // Only need one job per page. Note that ENQUEUE_FUDGE_SEC handles races where an |
| 79 | // older revision job gets inserted while the newer revision job is de-duplicated. |
| 80 | $this->removeDuplicates = true; |
| 81 | } |
| 82 | |
| 83 | public function run() { |
| 84 | $services = MediaWikiServices::getInstance(); |
| 85 | $lbFactory = $services->getDBLoadBalancerFactory(); |
| 86 | $lb = $lbFactory->getMainLB(); |
| 87 | $dbw = $lb->getConnectionRef( DB_PRIMARY ); |
| 88 | |
| 89 | $this->ticket = $lbFactory->getEmptyTransactionTicket( __METHOD__ ); |
| 90 | |
| 91 | $page = $services->getWikiPageFactory()->newFromID( $this->params['pageId'], IDBAccessObject::READ_LATEST ); |
| 92 | if ( !$page ) { |
| 93 | $this->setLastError( "Could not find page #{$this->params['pageId']}" ); |
| 94 | return false; // deleted? |
| 95 | } |
| 96 | |
| 97 | // Cut down on the time spent in waitForPrimaryPos() in the critical section |
| 98 | $dbr = $lb->getConnectionRef( DB_REPLICA ); |
| 99 | if ( !$lb->waitForPrimaryPos( $dbr ) ) { |
| 100 | $this->setLastError( "Timed out while pre-waiting for replica DB to catch up" ); |
| 101 | return false; |
| 102 | } |
| 103 | |
| 104 | // Use a named lock so that jobs for this page see each others' changes |
| 105 | $lockKey = "{$dbw->getDomainID()}:CategoryMembershipChange:{$page->getId()}"; // per-wiki |
| 106 | $scopedLock = $dbw->getScopedLockAndFlush( $lockKey, __METHOD__, 3 ); |
| 107 | if ( !$scopedLock ) { |
| 108 | $this->setLastError( "Could not acquire lock '$lockKey'" ); |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | // Wait till replica DB is caught up so that jobs for this page see each others' changes |
| 113 | if ( !$lb->waitForPrimaryPos( $dbr ) ) { |
| 114 | $this->setLastError( "Timed out while waiting for replica DB to catch up" ); |
| 115 | return false; |
| 116 | } |
| 117 | // Clear any stale REPEATABLE-READ snapshot |
| 118 | $dbr->flushSnapshot( __METHOD__ ); |
| 119 | |
| 120 | $cutoffUnix = wfTimestamp( TS_UNIX, $this->params['revTimestamp'] ); |
| 121 | // Using ENQUEUE_FUDGE_SEC handles jobs inserted out of revision order due to the delay |
| 122 | // between COMMIT and actual enqueueing of the CategoryMembershipChangeJob job. |
| 123 | $cutoffUnix -= self::ENQUEUE_FUDGE_SEC; |
| 124 | |
| 125 | // Get the newest page revision that has a SRC_CATEGORIZE row. |
| 126 | // Assume that category changes before it were already handled. |
| 127 | $subQuery = $dbr->newSelectQueryBuilder() |
| 128 | ->select( '1' ) |
| 129 | ->from( 'recentchanges' ) |
| 130 | ->where( 'rc_this_oldid = rev_id' ) |
| 131 | ->andWhere( [ 'rc_source' => RecentChange::SRC_CATEGORIZE ] ); |
| 132 | $row = $dbr->newSelectQueryBuilder() |
| 133 | ->select( [ 'rev_timestamp', 'rev_id' ] ) |
| 134 | ->from( 'revision' ) |
| 135 | ->where( [ 'rev_page' => $page->getId() ] ) |
| 136 | ->andWhere( $dbr->expr( 'rev_timestamp', '>=', $dbr->timestamp( $cutoffUnix ) ) ) |
| 137 | ->andWhere( 'EXISTS (' . $subQuery->caller( __METHOD__ )->getSQL() . ')' ) |
| 138 | ->orderBy( [ 'rev_timestamp', 'rev_id' ], SelectQueryBuilder::SORT_DESC ) |
| 139 | ->caller( __METHOD__ )->fetchRow(); |
| 140 | |
| 141 | // Only consider revisions newer than any such revision |
| 142 | if ( $row ) { |
| 143 | $cutoffUnix = wfTimestamp( TS_UNIX, $row->rev_timestamp ); |
| 144 | $lastRevId = (int)$row->rev_id; |
| 145 | } else { |
| 146 | $lastRevId = 0; |
| 147 | } |
| 148 | |
| 149 | // Find revisions to this page made around and after this revision which lack category |
| 150 | // notifications in recent changes. This lets jobs pick up were the last one left off. |
| 151 | $revisionStore = $services->getRevisionStore(); |
| 152 | $res = $revisionStore->newSelectQueryBuilder( $dbr ) |
| 153 | ->joinComment() |
| 154 | ->where( [ |
| 155 | 'rev_page' => $page->getId(), |
| 156 | $dbr->buildComparison( '>', [ |
| 157 | 'rev_timestamp' => $dbr->timestamp( $cutoffUnix ), |
| 158 | 'rev_id' => $lastRevId, |
| 159 | ] ) |
| 160 | ] ) |
| 161 | ->orderBy( [ 'rev_timestamp', 'rev_id' ], SelectQueryBuilder::SORT_ASC ) |
| 162 | ->caller( __METHOD__ )->fetchResultSet(); |
| 163 | |
| 164 | // Apply all category updates in revision timestamp order |
| 165 | foreach ( $res as $row ) { |
| 166 | $this->notifyUpdatesForRevision( $lbFactory, $page, $revisionStore->newRevisionFromRow( $row ) ); |
| 167 | } |
| 168 | |
| 169 | return true; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * @param LBFactory $lbFactory |
| 174 | * @param WikiPage $page |
| 175 | * @param RevisionRecord $newRev |
| 176 | */ |
| 177 | protected function notifyUpdatesForRevision( |
| 178 | LBFactory $lbFactory, WikiPage $page, RevisionRecord $newRev |
| 179 | ) { |
| 180 | $title = $page->getTitle(); |
| 181 | |
| 182 | // Get the new revision |
| 183 | if ( $newRev->isDeleted( RevisionRecord::DELETED_TEXT ) ) { |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | $services = MediaWikiServices::getInstance(); |
| 188 | // Get the prior revision (the same for null edits) |
| 189 | if ( $newRev->getParentId() ) { |
| 190 | $oldRev = $services->getRevisionLookup() |
| 191 | ->getRevisionById( $newRev->getParentId(), IDBAccessObject::READ_LATEST ); |
| 192 | if ( !$oldRev || $oldRev->isDeleted( RevisionRecord::DELETED_TEXT ) ) { |
| 193 | return; |
| 194 | } |
| 195 | } else { |
| 196 | $oldRev = null; |
| 197 | } |
| 198 | |
| 199 | // Parse the new revision and get the categories |
| 200 | $categoryChanges = $this->getExplicitCategoriesChanges( $page, $newRev, $oldRev ); |
| 201 | [ $categoryInserts, $categoryDeletes ] = $categoryChanges; |
| 202 | if ( !$categoryInserts && !$categoryDeletes ) { |
| 203 | return; // nothing to do |
| 204 | } |
| 205 | |
| 206 | $blc = $services->getBacklinkCacheFactory()->getBacklinkCache( $title ); |
| 207 | $catMembChange = new CategoryMembershipChange( $title, $blc, $newRev ); |
| 208 | $catMembChange->checkTemplateLinks(); |
| 209 | |
| 210 | $batchSize = $services->getMainConfig()->get( MainConfigNames::UpdateRowsPerQuery ); |
| 211 | $insertCount = 0; |
| 212 | |
| 213 | foreach ( $categoryInserts as $categoryName ) { |
| 214 | $categoryTitle = Title::makeTitle( NS_CATEGORY, $categoryName ); |
| 215 | $catMembChange->triggerCategoryAddedNotification( $categoryTitle ); |
| 216 | if ( $insertCount++ && ( $insertCount % $batchSize ) == 0 ) { |
| 217 | $lbFactory->commitAndWaitForReplication( __METHOD__, $this->ticket ); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | foreach ( $categoryDeletes as $categoryName ) { |
| 222 | $categoryTitle = Title::makeTitle( NS_CATEGORY, $categoryName ); |
| 223 | $catMembChange->triggerCategoryRemovedNotification( $categoryTitle ); |
| 224 | if ( $insertCount++ && ( $insertCount++ % $batchSize ) == 0 ) { |
| 225 | $lbFactory->commitAndWaitForReplication( __METHOD__, $this->ticket ); |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | private function getExplicitCategoriesChanges( |
| 231 | WikiPage $page, RevisionRecord $newRev, RevisionRecord $oldRev = null |
| 232 | ) { |
| 233 | // Inject the same timestamp for both revision parses to avoid seeing category changes |
| 234 | // due to time-based parser functions. Inject the same page title for the parses too. |
| 235 | // Note that REPEATABLE-READ makes template/file pages appear unchanged between parses. |
| 236 | $parseTimestamp = $newRev->getTimestamp(); |
| 237 | // Parse the old rev and get the categories. Do not use link tables as that |
| 238 | // assumes these updates are perfectly FIFO and that link tables are always |
| 239 | // up to date, neither of which are true. |
| 240 | $oldCategories = $oldRev |
| 241 | ? $this->getCategoriesAtRev( $page, $oldRev, $parseTimestamp ) |
| 242 | : []; |
| 243 | // Parse the new revision and get the categories |
| 244 | $newCategories = $this->getCategoriesAtRev( $page, $newRev, $parseTimestamp ); |
| 245 | |
| 246 | $categoryInserts = array_values( array_diff( $newCategories, $oldCategories ) ); |
| 247 | $categoryDeletes = array_values( array_diff( $oldCategories, $newCategories ) ); |
| 248 | |
| 249 | return [ $categoryInserts, $categoryDeletes ]; |
| 250 | } |
| 251 | |
| 252 | /** |
| 253 | * @param WikiPage $page |
| 254 | * @param RevisionRecord $rev |
| 255 | * @param string $parseTimestamp TS_MW |
| 256 | * |
| 257 | * @return string[] category names |
| 258 | */ |
| 259 | private function getCategoriesAtRev( WikiPage $page, RevisionRecord $rev, $parseTimestamp ) { |
| 260 | $services = MediaWikiServices::getInstance(); |
| 261 | $options = $page->makeParserOptions( 'canonical' ); |
| 262 | $options->setTimestamp( $parseTimestamp ); |
| 263 | $options->setRenderReason( 'CategoryMembershipChangeJob' ); |
| 264 | |
| 265 | $output = $rev instanceof RevisionStoreRecord && $rev->isCurrent() |
| 266 | ? $services->getParserCache()->get( $page, $options ) |
| 267 | : null; |
| 268 | |
| 269 | if ( !$output || $output->getCacheRevisionId() !== $rev->getId() ) { |
| 270 | $output = $services->getRevisionRenderer()->getRenderedRevision( $rev, $options ) |
| 271 | ->getRevisionParserOutput(); |
| 272 | } |
| 273 | |
| 274 | // array keys will cast numeric category names to ints; |
| 275 | // ::getCategoryNames() is careful to cast them back to strings |
| 276 | // to avoid breaking things! |
| 277 | return $output->getCategoryNames(); |
| 278 | } |
| 279 | |
| 280 | public function getDeduplicationInfo() { |
| 281 | $info = parent::getDeduplicationInfo(); |
| 282 | unset( $info['params']['revTimestamp'] ); // first job wins |
| 283 | |
| 284 | return $info; |
| 285 | } |
| 286 | } |