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| 1 | <?php |
| 2 | /** |
| 3 | * Updater for link tracking tables after a page edit. |
| 4 | * |
| 5 | * @license GPL-2.0-or-later |
| 6 | * @file |
| 7 | */ |
| 8 | |
| 9 | namespace MediaWiki\Deferred\LinksUpdate; |
| 10 | |
| 11 | use InvalidArgumentException; |
| 12 | use MediaWiki\Cache\BacklinkCache; |
| 13 | use MediaWiki\DB\WriteDuplicator; |
| 14 | use MediaWiki\Deferred\AutoCommitUpdate; |
| 15 | use MediaWiki\Deferred\DataUpdate; |
| 16 | use MediaWiki\Deferred\DeferredUpdates; |
| 17 | use MediaWiki\Deferred\TransactionRoundAwareUpdate; |
| 18 | use MediaWiki\HookContainer\ProtectedHookAccessorTrait; |
| 19 | use MediaWiki\JobQueue\Job; |
| 20 | use MediaWiki\JobQueue\Jobs\RefreshLinksJob; |
| 21 | use MediaWiki\Logger\LoggerFactory; |
| 22 | use MediaWiki\MainConfigNames; |
| 23 | use MediaWiki\MediaWikiServices; |
| 24 | use MediaWiki\Page\PageIdentity; |
| 25 | use MediaWiki\Page\PageReference; |
| 26 | use MediaWiki\Page\PageReferenceValue; |
| 27 | use MediaWiki\Parser\ParserOutput; |
| 28 | use MediaWiki\Revision\RevisionRecord; |
| 29 | use MediaWiki\Title\Title; |
| 30 | use MediaWiki\User\UserIdentity; |
| 31 | use RuntimeException; |
| 32 | use Wikimedia\LockManager\LockManager; |
| 33 | use Wikimedia\Rdbms\IConnectionProvider; |
| 34 | use Wikimedia\Rdbms\IDatabase; |
| 35 | use Wikimedia\Rdbms\IDBAccessObject; |
| 36 | use Wikimedia\ScopedCallback; |
| 37 | |
| 38 | /** |
| 39 | * Class the manages updates of *_link tables as well as similar extension-managed tables |
| 40 | * |
| 41 | * @note LinksUpdate is managed by DeferredUpdates::execute(). Do not run this in a transaction. |
| 42 | * |
| 43 | * See docs/deferred.txt |
| 44 | */ |
| 45 | class LinksUpdate extends DataUpdate implements TransactionRoundAwareUpdate { |
| 46 | use ProtectedHookAccessorTrait; |
| 47 | |
| 48 | /** @var int Page ID of the article linked from */ |
| 49 | protected $mId; |
| 50 | |
| 51 | /** @var Title Title object of the article linked from */ |
| 52 | protected $mTitle; |
| 53 | |
| 54 | /** @var ParserOutput */ |
| 55 | protected $mParserOutput; |
| 56 | |
| 57 | /** @var bool Whether to queue jobs for recursive updates */ |
| 58 | protected $mRecursive; |
| 59 | |
| 60 | /** @var bool Whether the page's redirect target may have changed in the latest revision */ |
| 61 | protected $mMaybeRedirectChanged; |
| 62 | |
| 63 | /** @var RevisionRecord Revision for which this update has been triggered */ |
| 64 | private $mRevisionRecord; |
| 65 | |
| 66 | /** |
| 67 | * @var UserIdentity|null |
| 68 | */ |
| 69 | private $user; |
| 70 | |
| 71 | /** @var IDatabase */ |
| 72 | private $db; |
| 73 | |
| 74 | /** @var LinksTableGroup */ |
| 75 | private $tableFactory; |
| 76 | |
| 77 | private IConnectionProvider $dbProvider; |
| 78 | private WriteDuplicator $linkWriteDuplicator; |
| 79 | |
| 80 | /** |
| 81 | * @param PageIdentity $page The page we're updating |
| 82 | * @param ParserOutput $parserOutput Output from a full parse of this page |
| 83 | * @param bool $recursive Queue jobs for recursive updates? |
| 84 | * @param bool $maybeRedirectChanged True if the page's redirect target may have changed in the |
| 85 | * latest revision. If false, this is used as a hint to skip some unnecessary updates. |
| 86 | */ |
| 87 | public function __construct( |
| 88 | PageIdentity $page, |
| 89 | ParserOutput $parserOutput, |
| 90 | $recursive = true, |
| 91 | $maybeRedirectChanged = true |
| 92 | ) { |
| 93 | parent::__construct(); |
| 94 | |
| 95 | $this->mTitle = Title::newFromPageIdentity( $page ); |
| 96 | $this->mParserOutput = $parserOutput; |
| 97 | $this->mRecursive = $recursive; |
| 98 | $this->mMaybeRedirectChanged = $maybeRedirectChanged; |
| 99 | |
| 100 | $services = MediaWikiServices::getInstance(); |
| 101 | $config = $services->getMainConfig(); |
| 102 | $this->tableFactory = new LinksTableGroup( |
| 103 | $services->getObjectFactory(), |
| 104 | $services->getDBLoadBalancerFactory(), |
| 105 | $services->getCollationFactory(), |
| 106 | $page, |
| 107 | $services->getLinkTargetLookup(), |
| 108 | $config->get( MainConfigNames::UpdateRowsPerQuery ), |
| 109 | $config->get( MainConfigNames::TempCategoryCollations ) |
| 110 | ); |
| 111 | // TODO: this does not have to be called in LinksDeletionUpdate |
| 112 | $this->tableFactory->setParserOutput( $parserOutput ); |
| 113 | $this->dbProvider = $services->getDBLoadBalancerFactory(); |
| 114 | $this->linkWriteDuplicator = $services->getLinkWriteDuplicator(); |
| 115 | } |
| 116 | |
| 117 | /** @inheritDoc */ |
| 118 | public function setTransactionTicket( $ticket ) { |
| 119 | parent::setTransactionTicket( $ticket ); |
| 120 | $this->tableFactory->setTransactionTicket( $ticket ); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Notify LinksUpdate that a move has just been completed and set the |
| 125 | * original title |
| 126 | */ |
| 127 | public function setMoveDetails( PageReference $oldPage ) { |
| 128 | $this->tableFactory->setMoveDetails( $oldPage ); |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Update link tables with outgoing links from an updated article |
| 133 | * |
| 134 | * @note this is managed by DeferredUpdates::execute(). Do not run this in a transaction. |
| 135 | */ |
| 136 | public function doUpdate() { |
| 137 | if ( !$this->mId ) { |
| 138 | // NOTE: subclasses may initialize mId directly! |
| 139 | $this->mId = $this->mTitle->getArticleID( IDBAccessObject::READ_LATEST ); |
| 140 | } |
| 141 | |
| 142 | if ( !$this->mId ) { |
| 143 | // Probably due to concurrent deletion or renaming of the page |
| 144 | $logger = LoggerFactory::getInstance( 'SecondaryDataUpdate' ); |
| 145 | $logger->warning( |
| 146 | 'LinksUpdate: The Title object yields no ID. Perhaps the page was deleted?', |
| 147 | [ |
| 148 | 'page_title' => $this->mTitle->getPrefixedDBkey(), |
| 149 | 'cause_action' => $this->getCauseAction(), |
| 150 | 'cause_agent' => $this->getCauseAgent() |
| 151 | ] |
| 152 | ); |
| 153 | |
| 154 | // nothing to do |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | // Do any setup that needs to be done prior to acquiring the lock |
| 159 | // Calling getAll() here has the side-effect of calling |
| 160 | // LinksUpdateBatch::setParserOutput() on all subclasses, allowing |
| 161 | // those methods to also do pre-lock operations. |
| 162 | foreach ( $this->tableFactory->getAll() as $table ) { |
| 163 | $table->beforeLock(); |
| 164 | } |
| 165 | |
| 166 | if ( $this->ticket ) { |
| 167 | // Make sure all links update threads see the changes of each other. |
| 168 | // This handles the case when updates have to batched into several COMMITs. |
| 169 | $scopedLock = self::acquirePageLock( $this->getDB(), $this->mId ); |
| 170 | if ( !$scopedLock ) { |
| 171 | throw new RuntimeException( "Could not acquire lock for page ID '{$this->mId}'." ); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | $this->getHookRunner()->onLinksUpdate( $this ); |
| 176 | $this->doIncrementalUpdate(); |
| 177 | |
| 178 | // Commit and release the lock (if set) |
| 179 | ScopedCallback::consume( $scopedLock ); |
| 180 | // Run post-commit hook handlers without DBO_TRX |
| 181 | DeferredUpdates::addUpdate( new AutoCommitUpdate( |
| 182 | $this->getDB(), |
| 183 | __METHOD__, |
| 184 | function () { |
| 185 | $this->getHookRunner()->onLinksUpdateComplete( $this, $this->ticket ); |
| 186 | } |
| 187 | ) ); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Acquire a session-level lock for performing link table updates for a page on a DB |
| 192 | * |
| 193 | * @param IDatabase $dbw |
| 194 | * @param int $pageId |
| 195 | * @param string $why One of (job, atomicity) |
| 196 | * @since 1.27 |
| 197 | */ |
| 198 | #[\NoDiscard] |
| 199 | public static function acquirePageLock( IDatabase $dbw, $pageId, $why = 'atomicity' ): ?ScopedCallback { |
| 200 | $key = "{$dbw->getDomainID()}:LinksUpdate:$why:pageid:$pageId"; // per-wiki |
| 201 | $lockManager = MediaWikiServices::getInstance()->getLockManager(); |
| 202 | $status = $lockManager->lock( [ $key ], LockManager::LOCK_EX, 1 ); |
| 203 | if ( !$status->isOK() ) { |
| 204 | $logger = LoggerFactory::getInstance( 'SecondaryDataUpdate' ); |
| 205 | $logger->info( "Could not acquire lock '{key}' for page ID '{page_id}'.", [ |
| 206 | 'key' => $key, |
| 207 | 'page_id' => $pageId, |
| 208 | ] ); |
| 209 | return null; |
| 210 | } |
| 211 | $unlocker = new ScopedCallback( static function () use ( $key, $lockManager ) { |
| 212 | $lockManager->unlock( [ $key ] ); |
| 213 | } ); |
| 214 | return $unlocker; |
| 215 | } |
| 216 | |
| 217 | protected function doIncrementalUpdate() { |
| 218 | foreach ( $this->tableFactory->getAll() as $table ) { |
| 219 | $table->update(); |
| 220 | } |
| 221 | |
| 222 | # Refresh links of all pages including this page |
| 223 | # This will be in a separate transaction |
| 224 | if ( $this->mRecursive ) { |
| 225 | $this->queueRecursiveJobs(); |
| 226 | } |
| 227 | |
| 228 | # Update the links table freshness for this title |
| 229 | $this->updateLinksTimestamp(); |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Queue recursive jobs for this page |
| 234 | * |
| 235 | * Which means do LinksUpdate on all pages that include the current page, |
| 236 | * using the job queue. |
| 237 | */ |
| 238 | protected function queueRecursiveJobs() { |
| 239 | $services = MediaWikiServices::getInstance(); |
| 240 | $backlinkCache = $services->getBacklinkCacheFactory() |
| 241 | ->getBacklinkCache( $this->mTitle ); |
| 242 | $action = $this->getCauseAction(); |
| 243 | $agent = $this->getCauseAgent(); |
| 244 | |
| 245 | self::queueRecursiveJobsForTable( |
| 246 | $this->mTitle, 'templatelinks', $action, $agent, $backlinkCache |
| 247 | ); |
| 248 | if ( $this->mMaybeRedirectChanged && $this->mTitle->getNamespace() === NS_FILE ) { |
| 249 | // Process imagelinks in case the redirect target has changed |
| 250 | self::queueRecursiveJobsForTable( |
| 251 | $this->mTitle, 'imagelinks', $action, $agent, $backlinkCache |
| 252 | ); |
| 253 | } |
| 254 | |
| 255 | // Get jobs for cascade-protected backlinks for a high priority queue. |
| 256 | // If meta-templates change to using a new template, the new template |
| 257 | // should be implicitly protected as soon as possible, if applicable. |
| 258 | // These jobs duplicate a subset of the above ones, but can run sooner. |
| 259 | // Which ever runs first generally no-ops the other one. |
| 260 | $jobs = []; |
| 261 | foreach ( $backlinkCache->getCascadeProtectedLinkPages() as $page ) { |
| 262 | $jobs[] = RefreshLinksJob::newPrioritized( |
| 263 | $page, |
| 264 | [ |
| 265 | 'causeAction' => $action, |
| 266 | 'causeAgent' => $agent |
| 267 | ] |
| 268 | ); |
| 269 | } |
| 270 | $services->getJobQueueGroup()->push( $jobs ); |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Queue a RefreshLinks job for any table. |
| 275 | * |
| 276 | * @param PageIdentity $page Page to do job for |
| 277 | * @param string $table Table to use (e.g. 'templatelinks') |
| 278 | * @param string $action Triggering action |
| 279 | * @param string $userName Triggering user name |
| 280 | * @param BacklinkCache|null $backlinkCache |
| 281 | */ |
| 282 | public static function queueRecursiveJobsForTable( |
| 283 | PageIdentity $page, $table, $action = 'LinksUpdate', $userName = 'unknown', ?BacklinkCache $backlinkCache = null |
| 284 | ) { |
| 285 | $title = Title::newFromPageIdentity( $page ); |
| 286 | if ( !$backlinkCache ) { |
| 287 | wfDeprecatedMsg( __METHOD__ . " needs a BacklinkCache object, null passed", '1.37' ); |
| 288 | $backlinkCache = MediaWikiServices::getInstance()->getBacklinkCacheFactory() |
| 289 | ->getBacklinkCache( $title ); |
| 290 | } |
| 291 | if ( $backlinkCache->hasLinks( $table ) ) { |
| 292 | $job = new RefreshLinksJob( |
| 293 | $title, |
| 294 | [ |
| 295 | 'table' => $table, |
| 296 | 'recursive' => true, |
| 297 | ] + Job::newRootJobParams( // "overall" refresh links job info |
| 298 | "refreshlinks:{$table}:{$title->getPrefixedText()}" |
| 299 | ) + [ 'causeAction' => $action, 'causeAgent' => $userName ] |
| 300 | ); |
| 301 | |
| 302 | MediaWikiServices::getInstance()->getJobQueueGroup()->push( $job ); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * Omit conflict resolution options from the insert query so that testing |
| 308 | * can confirm that the incremental update logic was correct. |
| 309 | * |
| 310 | * @param bool $mode |
| 311 | */ |
| 312 | public function setStrictTestMode( $mode = true ) { |
| 313 | $this->tableFactory->setStrictTestMode( $mode ); |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Return the title object of the page being updated |
| 318 | * @return Title |
| 319 | */ |
| 320 | public function getTitle() { |
| 321 | return $this->mTitle; |
| 322 | } |
| 323 | |
| 324 | /** |
| 325 | * Get the page_id of the page being updated |
| 326 | * |
| 327 | * @since 1.38 |
| 328 | * @return int |
| 329 | */ |
| 330 | public function getPageId() { |
| 331 | if ( $this->mId ) { |
| 332 | return $this->mId; |
| 333 | } else { |
| 334 | return $this->mTitle->getArticleID(); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * Returns parser output |
| 340 | * @since 1.19 |
| 341 | * @return ParserOutput |
| 342 | */ |
| 343 | public function getParserOutput() { |
| 344 | return $this->mParserOutput; |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Set the RevisionRecord corresponding to this LinksUpdate |
| 349 | * |
| 350 | * @since 1.35 |
| 351 | * @param RevisionRecord $revisionRecord |
| 352 | */ |
| 353 | public function setRevisionRecord( RevisionRecord $revisionRecord ) { |
| 354 | $this->mRevisionRecord = $revisionRecord; |
| 355 | $this->tableFactory->setRevision( $revisionRecord ); |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * @since 1.35 |
| 360 | * @return RevisionRecord|null |
| 361 | */ |
| 362 | public function getRevisionRecord() { |
| 363 | return $this->mRevisionRecord; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * Set the user who triggered this LinksUpdate |
| 368 | * |
| 369 | * @since 1.27 |
| 370 | * @param UserIdentity $user |
| 371 | */ |
| 372 | public function setTriggeringUser( UserIdentity $user ) { |
| 373 | $this->user = $user; |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * Get the user who triggered this LinksUpdate |
| 378 | * |
| 379 | * @since 1.27 |
| 380 | * @return UserIdentity|null |
| 381 | */ |
| 382 | public function getTriggeringUser(): ?UserIdentity { |
| 383 | return $this->user; |
| 384 | } |
| 385 | |
| 386 | protected function getPageLinksTable(): PageLinksTable { |
| 387 | // @phan-suppress-next-line PhanTypeMismatchReturnSuperType |
| 388 | return $this->tableFactory->get( 'pagelinks' ); |
| 389 | } |
| 390 | |
| 391 | protected function getExternalLinksTable(): ExternalLinksTable { |
| 392 | // @phan-suppress-next-line PhanTypeMismatchReturnSuperType |
| 393 | return $this->tableFactory->get( 'externallinks' ); |
| 394 | } |
| 395 | |
| 396 | protected function getPagePropsTable(): PagePropsTable { |
| 397 | // @phan-suppress-next-line PhanTypeMismatchReturnSuperType |
| 398 | return $this->tableFactory->get( 'page_props' ); |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * Fetch page links added by this LinksUpdate. Only available after the update is complete. |
| 403 | * |
| 404 | * @since 1.22 |
| 405 | * @deprecated since 1.38 use getPageReferenceIterator() or getPageReferenceArray(), hard-deprecated since 1.43 |
| 406 | * @return Title[] Array of Titles |
| 407 | */ |
| 408 | public function getAddedLinks() { |
| 409 | wfDeprecated( __METHOD__, '1.43' ); |
| 410 | return $this->getPageLinksTable()->getTitleArray( LinksTable::INSERTED ); |
| 411 | } |
| 412 | |
| 413 | /** |
| 414 | * Fetch page links removed by this LinksUpdate. Only available after the update is complete. |
| 415 | * |
| 416 | * @since 1.22 |
| 417 | * @deprecated since 1.38 use getPageReferenceIterator() or getPageReferenceArray(), hard-deprecated since 1.43 |
| 418 | * @return Title[] Array of Titles |
| 419 | */ |
| 420 | public function getRemovedLinks() { |
| 421 | wfDeprecated( __METHOD__, '1.43' ); |
| 422 | return $this->getPageLinksTable()->getTitleArray( LinksTable::DELETED ); |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * Fetch external links added by this LinksUpdate. Only available after |
| 427 | * the update is complete. |
| 428 | * @since 1.33 |
| 429 | * @return null|array Array of Strings |
| 430 | */ |
| 431 | public function getAddedExternalLinks() { |
| 432 | return $this->getExternalLinksTable()->getStringArray( LinksTable::INSERTED ); |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * Fetch external links removed by this LinksUpdate. Only available after |
| 437 | * the update is complete. |
| 438 | * @since 1.33 |
| 439 | * @return null|string[] |
| 440 | */ |
| 441 | public function getRemovedExternalLinks() { |
| 442 | return $this->getExternalLinksTable()->getStringArray( LinksTable::DELETED ); |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * Fetch page properties added by this LinksUpdate. |
| 447 | * Only available after the update is complete. |
| 448 | * @since 1.28 |
| 449 | * @return null|array |
| 450 | */ |
| 451 | public function getAddedProperties() { |
| 452 | return $this->getPagePropsTable()->getAssocArray( LinksTable::INSERTED ); |
| 453 | } |
| 454 | |
| 455 | /** |
| 456 | * Fetch page properties removed by this LinksUpdate. |
| 457 | * Only available after the update is complete. |
| 458 | * @since 1.28 |
| 459 | * @return null|array |
| 460 | */ |
| 461 | public function getRemovedProperties() { |
| 462 | return $this->getPagePropsTable()->getAssocArray( LinksTable::DELETED ); |
| 463 | } |
| 464 | |
| 465 | /** |
| 466 | * Get an iterator over PageReferenceValue objects corresponding to a given set |
| 467 | * type in a given table. |
| 468 | * |
| 469 | * @since 1.38 |
| 470 | * @param string $tableName The name of any table that links to local titles |
| 471 | * @param int $setType One of: |
| 472 | * - LinksTable::INSERTED: The inserted links |
| 473 | * - LinksTable::DELETED: The deleted links |
| 474 | * - LinksTable::CHANGED: Both the inserted and deleted links |
| 475 | * - LinksTable::OLD: The old set of links, loaded before the update |
| 476 | * - LinksTable::NEW: The new set of links from the ParserOutput |
| 477 | * @return iterable<PageReferenceValue> |
| 478 | * @phan-return \Traversable |
| 479 | */ |
| 480 | public function getPageReferenceIterator( $tableName, $setType ) { |
| 481 | $table = $this->tableFactory->get( $tableName ); |
| 482 | if ( $table instanceof TitleLinksTable ) { |
| 483 | return $table->getPageReferenceIterator( $setType ); |
| 484 | } else { |
| 485 | throw new InvalidArgumentException( |
| 486 | __METHOD__ . ": $tableName does not have a list of titles" ); |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /** |
| 491 | * Same as getPageReferenceIterator() but converted to an array for convenience |
| 492 | * (at the expense of additional time and memory usage) |
| 493 | * |
| 494 | * @since 1.38 |
| 495 | * @param string $tableName |
| 496 | * @param int $setType |
| 497 | * @return PageReferenceValue[] |
| 498 | */ |
| 499 | public function getPageReferenceArray( $tableName, $setType ) { |
| 500 | return iterator_to_array( $this->getPageReferenceIterator( $tableName, $setType ) ); |
| 501 | } |
| 502 | |
| 503 | /** |
| 504 | * Update links table freshness |
| 505 | */ |
| 506 | protected function updateLinksTimestamp() { |
| 507 | if ( $this->mId ) { |
| 508 | // The link updates made here only reflect the freshness of the parser output |
| 509 | $timestamp = $this->mParserOutput->getCacheTime(); |
| 510 | $update = $this->getDB()->newUpdateQueryBuilder() |
| 511 | ->update( 'page' ) |
| 512 | ->set( [ 'page_links_updated' => $this->getDB()->timestamp( $timestamp ) ] ) |
| 513 | ->where( [ 'page_id' => $this->mId ] ) |
| 514 | ->caller( __METHOD__ ); |
| 515 | $update->execute(); |
| 516 | |
| 517 | $this->linkWriteDuplicator->duplicate( $update ); |
| 518 | } |
| 519 | } |
| 520 | |
| 521 | /** |
| 522 | * @return IDatabase |
| 523 | */ |
| 524 | protected function getDB() { |
| 525 | if ( !$this->db ) { |
| 526 | $this->db = $this->dbProvider->getPrimaryDatabase(); |
| 527 | } |
| 528 | |
| 529 | return $this->db; |
| 530 | } |
| 531 | |
| 532 | /** |
| 533 | * Whether or not this LinksUpdate will also update pages which transclude the |
| 534 | * current page or otherwise depend on it. |
| 535 | * |
| 536 | * @return bool |
| 537 | */ |
| 538 | public function isRecursive() { |
| 539 | return $this->mRecursive; |
| 540 | } |
| 541 | |
| 542 | /** @inheritDoc */ |
| 543 | public function getTransactionRoundRequirement() { |
| 544 | return self::TRX_ROUND_ABSENT; |
| 545 | } |
| 546 | } |