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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\Config\ServiceOptions; |
| 22 | use MediaWiki\Context\RequestContext; |
| 23 | use MediaWiki\Deferred\DeferredUpdates; |
| 24 | use MediaWiki\Deferred\MessageCacheUpdate; |
| 25 | use MediaWiki\HookContainer\HookContainer; |
| 26 | use MediaWiki\HookContainer\HookRunner; |
| 27 | use MediaWiki\Languages\LanguageConverterFactory; |
| 28 | use MediaWiki\Languages\LanguageFactory; |
| 29 | use MediaWiki\Languages\LanguageFallback; |
| 30 | use MediaWiki\Languages\LanguageNameUtils; |
| 31 | use MediaWiki\Linker\LinkTarget; |
| 32 | use MediaWiki\Logger\LoggerFactory; |
| 33 | use MediaWiki\MainConfigNames; |
| 34 | use MediaWiki\MediaWikiServices; |
| 35 | use MediaWiki\Page\PageReference; |
| 36 | use MediaWiki\Page\PageReferenceValue; |
| 37 | use MediaWiki\Parser\Parser; |
| 38 | use MediaWiki\Parser\ParserOutput; |
| 39 | use MediaWiki\Revision\SlotRecord; |
| 40 | use MediaWiki\StubObject\StubObject; |
| 41 | use MediaWiki\StubObject\StubUserLang; |
| 42 | use MediaWiki\Title\Title; |
| 43 | use Psr\Log\LoggerAwareInterface; |
| 44 | use Psr\Log\LoggerInterface; |
| 45 | use Wikimedia\LightweightObjectStore\ExpirationAwareness; |
| 46 | use Wikimedia\ObjectCache\BagOStuff; |
| 47 | use Wikimedia\ObjectCache\EmptyBagOStuff; |
| 48 | use Wikimedia\Rdbms\Database; |
| 49 | use Wikimedia\Rdbms\IExpression; |
| 50 | use Wikimedia\Rdbms\IResultWrapper; |
| 51 | use Wikimedia\Rdbms\LikeValue; |
| 52 | use Wikimedia\RequestTimeout\TimeoutException; |
| 53 | use Wikimedia\ScopedCallback; |
| 54 | |
| 55 | /** |
| 56 | * MediaWiki message cache structure version. |
| 57 | * Bump this whenever the message cache format has changed. |
| 58 | */ |
| 59 | define( 'MSG_CACHE_VERSION', 2 ); |
| 60 | |
| 61 | /** |
| 62 | * Cache messages that are defined by MediaWiki-namespace pages or by hooks. |
| 63 | * |
| 64 | * @ingroup Language |
| 65 | */ |
| 66 | class MessageCache implements LoggerAwareInterface { |
| 67 | /** |
| 68 | * Options to be included in the ServiceOptions |
| 69 | */ |
| 70 | public const CONSTRUCTOR_OPTIONS = [ |
| 71 | MainConfigNames::UseDatabaseMessages, |
| 72 | MainConfigNames::MaxMsgCacheEntrySize, |
| 73 | MainConfigNames::AdaptiveMessageCache, |
| 74 | MainConfigNames::UseXssLanguage, |
| 75 | MainConfigNames::RawHtmlMessages, |
| 76 | ]; |
| 77 | |
| 78 | /** |
| 79 | * The size of the MapCacheLRU which stores message data. The maximum |
| 80 | * number of languages which can be efficiently loaded in a given request. |
| 81 | */ |
| 82 | public const MAX_REQUEST_LANGUAGES = 10; |
| 83 | |
| 84 | private const FOR_UPDATE = 1; // force message reload |
| 85 | |
| 86 | /** How long to wait for memcached locks */ |
| 87 | private const WAIT_SEC = 15; |
| 88 | /** How long memcached locks last */ |
| 89 | private const LOCK_TTL = 30; |
| 90 | |
| 91 | /** |
| 92 | * Lifetime for cache, for keys stored in $wanCache, in seconds. |
| 93 | * @var int |
| 94 | */ |
| 95 | private const WAN_TTL = ExpirationAwareness::TTL_DAY; |
| 96 | |
| 97 | /** @var LoggerInterface */ |
| 98 | private $logger; |
| 99 | |
| 100 | /** |
| 101 | * Process cache of loaded messages that are defined in MediaWiki namespace |
| 102 | * |
| 103 | * @var MapCacheLRU Map of (language code => key => " <MESSAGE>" or "!TOO BIG" or "!ERROR") |
| 104 | */ |
| 105 | private $cache; |
| 106 | |
| 107 | /** |
| 108 | * Map of (lowercase message key => unused) for all software-defined messages |
| 109 | * |
| 110 | * @var array |
| 111 | */ |
| 112 | private $systemMessageNames; |
| 113 | |
| 114 | /** |
| 115 | * @var bool[] Map of (language code => boolean) |
| 116 | */ |
| 117 | private $cacheVolatile = []; |
| 118 | |
| 119 | /** |
| 120 | * Should mean that database cannot be used, but check |
| 121 | * @var bool |
| 122 | */ |
| 123 | private $disable; |
| 124 | |
| 125 | /** @var int Maximum entry size in bytes */ |
| 126 | private $maxEntrySize; |
| 127 | |
| 128 | /** @var bool */ |
| 129 | private $adaptive; |
| 130 | |
| 131 | /** @var bool */ |
| 132 | private $useXssLanguage; |
| 133 | |
| 134 | /** @var string[] */ |
| 135 | private $rawHtmlMessages; |
| 136 | |
| 137 | /** |
| 138 | * Message cache has its own parser which it uses to transform messages |
| 139 | * @var ParserOptions |
| 140 | */ |
| 141 | private $parserOptions; |
| 142 | |
| 143 | /** @var ?Parser Lazy-created via self::getParser() */ |
| 144 | private $parser = null; |
| 145 | |
| 146 | /** |
| 147 | * @var bool |
| 148 | */ |
| 149 | private $inParser = false; |
| 150 | |
| 151 | /** @var WANObjectCache */ |
| 152 | private $wanCache; |
| 153 | /** @var BagOStuff */ |
| 154 | private $clusterCache; |
| 155 | /** @var BagOStuff */ |
| 156 | private $srvCache; |
| 157 | /** @var Language */ |
| 158 | private $contLang; |
| 159 | /** @var string */ |
| 160 | private $contLangCode; |
| 161 | /** @var ILanguageConverter */ |
| 162 | private $contLangConverter; |
| 163 | /** @var LanguageFactory */ |
| 164 | private $langFactory; |
| 165 | /** @var LocalisationCache */ |
| 166 | private $localisationCache; |
| 167 | /** @var LanguageNameUtils */ |
| 168 | private $languageNameUtils; |
| 169 | /** @var LanguageFallback */ |
| 170 | private $languageFallback; |
| 171 | /** @var HookRunner */ |
| 172 | private $hookRunner; |
| 173 | /** @var ParserFactory */ |
| 174 | private $parserFactory; |
| 175 | |
| 176 | /** @var (string|callable)[]|null */ |
| 177 | private $messageKeyOverrides; |
| 178 | |
| 179 | /** |
| 180 | * Normalize message key input |
| 181 | * |
| 182 | * @param string $key Input message key to be normalized |
| 183 | * @return string Normalized message key |
| 184 | */ |
| 185 | public static function normalizeKey( $key ) { |
| 186 | $lckey = strtr( $key, ' ', '_' ); |
| 187 | if ( $lckey === '' ) { |
| 188 | // T300792 |
| 189 | return $lckey; |
| 190 | } |
| 191 | |
| 192 | if ( ord( $lckey ) < 128 ) { |
| 193 | $lckey[0] = strtolower( $lckey[0] ); |
| 194 | } else { |
| 195 | $lckey = MediaWikiServices::getInstance()->getContentLanguage()->lcfirst( $lckey ); |
| 196 | } |
| 197 | |
| 198 | return $lckey; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * @internal For use by ServiceWiring |
| 203 | * @param WANObjectCache $wanCache |
| 204 | * @param BagOStuff $clusterCache |
| 205 | * @param BagOStuff $serverCache |
| 206 | * @param Language $contLang Content language of site |
| 207 | * @param LanguageConverterFactory $langConverterFactory |
| 208 | * @param LoggerInterface $logger |
| 209 | * @param ServiceOptions $options |
| 210 | * @param LanguageFactory $langFactory |
| 211 | * @param LocalisationCache $localisationCache |
| 212 | * @param LanguageNameUtils $languageNameUtils |
| 213 | * @param LanguageFallback $languageFallback |
| 214 | * @param HookContainer $hookContainer |
| 215 | * @param ParserFactory $parserFactory |
| 216 | */ |
| 217 | public function __construct( |
| 218 | WANObjectCache $wanCache, |
| 219 | BagOStuff $clusterCache, |
| 220 | BagOStuff $serverCache, |
| 221 | Language $contLang, |
| 222 | LanguageConverterFactory $langConverterFactory, |
| 223 | LoggerInterface $logger, |
| 224 | ServiceOptions $options, |
| 225 | LanguageFactory $langFactory, |
| 226 | LocalisationCache $localisationCache, |
| 227 | LanguageNameUtils $languageNameUtils, |
| 228 | LanguageFallback $languageFallback, |
| 229 | HookContainer $hookContainer, |
| 230 | ParserFactory $parserFactory |
| 231 | ) { |
| 232 | $this->wanCache = $wanCache; |
| 233 | $this->clusterCache = $clusterCache; |
| 234 | $this->srvCache = $serverCache; |
| 235 | $this->contLang = $contLang; |
| 236 | $this->contLangConverter = $langConverterFactory->getLanguageConverter( $contLang ); |
| 237 | $this->contLangCode = $contLang->getCode(); |
| 238 | $this->logger = $logger; |
| 239 | $this->langFactory = $langFactory; |
| 240 | $this->localisationCache = $localisationCache; |
| 241 | $this->languageNameUtils = $languageNameUtils; |
| 242 | $this->languageFallback = $languageFallback; |
| 243 | $this->hookRunner = new HookRunner( $hookContainer ); |
| 244 | $this->parserFactory = $parserFactory; |
| 245 | |
| 246 | // limit size |
| 247 | $this->cache = new MapCacheLRU( self::MAX_REQUEST_LANGUAGES ); |
| 248 | |
| 249 | $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS ); |
| 250 | $this->disable = !$options->get( MainConfigNames::UseDatabaseMessages ); |
| 251 | $this->maxEntrySize = $options->get( MainConfigNames::MaxMsgCacheEntrySize ); |
| 252 | $this->adaptive = $options->get( MainConfigNames::AdaptiveMessageCache ); |
| 253 | $this->useXssLanguage = $options->get( MainConfigNames::UseXssLanguage ); |
| 254 | $this->rawHtmlMessages = $options->get( MainConfigNames::RawHtmlMessages ); |
| 255 | } |
| 256 | |
| 257 | public function setLogger( LoggerInterface $logger ) { |
| 258 | $this->logger = $logger; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * ParserOptions is lazily initialised. |
| 263 | * |
| 264 | * @return ParserOptions |
| 265 | */ |
| 266 | private function getParserOptions() { |
| 267 | if ( !$this->parserOptions ) { |
| 268 | $context = RequestContext::getMain(); |
| 269 | $user = $context->getUser(); |
| 270 | if ( !$user->isSafeToLoad() ) { |
| 271 | // It isn't safe to use the context user yet, so don't try to get a |
| 272 | // ParserOptions for it. And don't cache this ParserOptions |
| 273 | // either. |
| 274 | $po = ParserOptions::newFromAnon(); |
| 275 | $po->setAllowUnsafeRawHtml( false ); |
| 276 | return $po; |
| 277 | } |
| 278 | |
| 279 | $this->parserOptions = ParserOptions::newFromContext( $context ); |
| 280 | // Messages may take parameters that could come |
| 281 | // from malicious sources. As a precaution, disable |
| 282 | // the <html> parser tag when parsing messages. |
| 283 | $this->parserOptions->setAllowUnsafeRawHtml( false ); |
| 284 | } |
| 285 | |
| 286 | return $this->parserOptions; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Try to load the cache from APC. |
| 291 | * |
| 292 | * @param string $code Optional language code, see documentation of load(). |
| 293 | * @return array|false The cache array, or false if not in cache. |
| 294 | */ |
| 295 | private function getLocalCache( $code ) { |
| 296 | $cacheKey = $this->srvCache->makeKey( __CLASS__, $code ); |
| 297 | |
| 298 | return $this->srvCache->get( $cacheKey ); |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * Save the cache to APC. |
| 303 | * |
| 304 | * @param string $code |
| 305 | * @param array $cache The cache array |
| 306 | */ |
| 307 | private function saveToLocalCache( $code, $cache ) { |
| 308 | $cacheKey = $this->srvCache->makeKey( __CLASS__, $code ); |
| 309 | $this->srvCache->set( $cacheKey, $cache ); |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * Loads messages from caches or from database in this order: |
| 314 | * (1) local message cache (if $wgUseLocalMessageCache is enabled) |
| 315 | * (2) memcached |
| 316 | * (3) from the database. |
| 317 | * |
| 318 | * When successfully loading from (2) or (3), all higher level caches are |
| 319 | * updated for the newest version. |
| 320 | * |
| 321 | * Nothing is loaded if member variable mDisable is true, either manually |
| 322 | * set by calling code or if message loading fails (is this possible?). |
| 323 | * |
| 324 | * Returns true if cache is already populated, or it was successfully populated, |
| 325 | * or false if populating empty cache fails. Also returns true if MessageCache |
| 326 | * is disabled. |
| 327 | * |
| 328 | * @param string $code Which language to load messages for |
| 329 | * @param int|null $mode Use MessageCache::FOR_UPDATE to skip process cache [optional] |
| 330 | * @return bool |
| 331 | */ |
| 332 | private function load( string $code, $mode = null ) { |
| 333 | // Don't do double loading... |
| 334 | if ( $this->isLanguageLoaded( $code ) && $mode !== self::FOR_UPDATE ) { |
| 335 | return true; |
| 336 | } |
| 337 | |
| 338 | // Show a log message (once) if loading is disabled |
| 339 | if ( $this->disable ) { |
| 340 | static $shownDisabled = false; |
| 341 | if ( !$shownDisabled ) { |
| 342 | $this->logger->debug( __METHOD__ . ': disabled' ); |
| 343 | $shownDisabled = true; |
| 344 | } |
| 345 | |
| 346 | return true; |
| 347 | } |
| 348 | |
| 349 | try { |
| 350 | return $this->loadUnguarded( $code, $mode ); |
| 351 | } catch ( Throwable $e ) { |
| 352 | // Don't try to load again during the exception handler |
| 353 | $this->disable = true; |
| 354 | throw $e; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | /** |
| 359 | * Load messages from the cache or database, without exception guarding. |
| 360 | * |
| 361 | * @param string $code Which language to load messages for |
| 362 | * @param int|null $mode Use MessageCache::FOR_UPDATE to skip process cache [optional] |
| 363 | * @return bool |
| 364 | */ |
| 365 | private function loadUnguarded( $code, $mode ) { |
| 366 | $success = false; // Keep track of success |
| 367 | $staleCache = false; // a cache array with expired data, or false if none has been loaded |
| 368 | $where = []; // Debug info, delayed to avoid spamming debug log too much |
| 369 | |
| 370 | // A hash of the expected content is stored in a WAN cache key, providing a way |
| 371 | // to invalid the local cache on every server whenever a message page changes. |
| 372 | [ $hash, $hashVolatile ] = $this->getValidationHash( $code ); |
| 373 | $this->cacheVolatile[$code] = $hashVolatile; |
| 374 | $volatilityOnlyStaleness = false; |
| 375 | |
| 376 | // Try the local cache and check against the cluster hash key... |
| 377 | $cache = $this->getLocalCache( $code ); |
| 378 | if ( !$cache ) { |
| 379 | $where[] = 'local cache is empty'; |
| 380 | } elseif ( !isset( $cache['HASH'] ) || $cache['HASH'] !== $hash ) { |
| 381 | $where[] = 'local cache has the wrong hash'; |
| 382 | $staleCache = $cache; |
| 383 | } elseif ( $this->isCacheExpired( $cache ) ) { |
| 384 | $where[] = 'local cache is expired'; |
| 385 | $staleCache = $cache; |
| 386 | } elseif ( $hashVolatile ) { |
| 387 | // Some recent message page changes might not show due to DB lag |
| 388 | $where[] = 'local cache validation key is expired/volatile'; |
| 389 | $staleCache = $cache; |
| 390 | $volatilityOnlyStaleness = true; |
| 391 | } else { |
| 392 | $where[] = 'got from local cache'; |
| 393 | $this->cache->set( $code, $cache ); |
| 394 | $success = true; |
| 395 | } |
| 396 | |
| 397 | if ( !$success ) { |
| 398 | // Try the cluster cache, using a lock for regeneration... |
| 399 | $cacheKey = $this->clusterCache->makeKey( 'messages', $code ); |
| 400 | for ( $failedAttempts = 0; $failedAttempts <= 1; $failedAttempts++ ) { |
| 401 | if ( $volatilityOnlyStaleness && $staleCache ) { |
| 402 | // While the cluster cache *might* be more up-to-date, we do not want |
| 403 | // the I/O strain of every application server fetching the key here during |
| 404 | // the volatility period. Either this thread wins the lock and regenerates |
| 405 | // the cache or the stale local cache value gets reused. |
| 406 | $where[] = 'global cache is presumed expired'; |
| 407 | } else { |
| 408 | $cache = $this->clusterCache->get( $cacheKey ); |
| 409 | if ( !$cache ) { |
| 410 | $where[] = 'global cache is empty'; |
| 411 | } elseif ( $this->isCacheExpired( $cache ) ) { |
| 412 | $where[] = 'global cache is expired'; |
| 413 | $staleCache = $cache; |
| 414 | } elseif ( $hashVolatile ) { |
| 415 | // Some recent message page changes might not show due to DB lag |
| 416 | $where[] = 'global cache is expired/volatile'; |
| 417 | $staleCache = $cache; |
| 418 | } else { |
| 419 | $where[] = 'got from global cache'; |
| 420 | $this->cache->set( $code, $cache ); |
| 421 | $this->saveToCaches( $cache, 'local-only', $code ); |
| 422 | $success = true; |
| 423 | break; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | // We need to call loadFromDB(). Limit the concurrency to one thread. |
| 428 | // This prevents the site from going down when the cache expires. |
| 429 | // Note that the DB slam protection lock here is non-blocking. |
| 430 | $loadStatus = $this->loadFromDBWithMainLock( $code, $where, $mode ); |
| 431 | if ( $loadStatus === true ) { |
| 432 | $success = true; |
| 433 | break; |
| 434 | } elseif ( $staleCache ) { |
| 435 | // Use the stale cache while some other thread constructs the new one |
| 436 | $where[] = 'using stale cache'; |
| 437 | $this->cache->set( $code, $staleCache ); |
| 438 | $success = true; |
| 439 | break; |
| 440 | } elseif ( $failedAttempts > 0 ) { |
| 441 | $where[] = 'failed to find cache after waiting'; |
| 442 | // Already blocked once, so avoid another lock/unlock cycle. |
| 443 | // This case will typically be hit if memcached is down, or if |
| 444 | // loadFromDB() takes longer than LOCK_WAIT. |
| 445 | break; |
| 446 | } elseif ( $loadStatus === 'cantacquire' ) { |
| 447 | // Wait for the other thread to finish, then retry. Normally, |
| 448 | // the memcached get() will then yield the other thread's result. |
| 449 | $where[] = 'waiting for other thread to complete'; |
| 450 | [ , $ioError ] = $this->getReentrantScopedLock( $code ); |
| 451 | if ( $ioError ) { |
| 452 | $where[] = 'failed waiting'; |
| 453 | // Call loadFromDB() with concurrency limited to one thread per server. |
| 454 | // It should be rare for all servers to lack even a stale local cache. |
| 455 | $success = $this->loadFromDBWithLocalLock( $code, $where, $mode ); |
| 456 | break; |
| 457 | } |
| 458 | } else { |
| 459 | // Disable cache; $loadStatus is 'disabled' |
| 460 | break; |
| 461 | } |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | if ( !$success ) { |
| 466 | $where[] = 'loading FAILED - cache is disabled'; |
| 467 | $this->disable = true; |
| 468 | $this->cache->set( $code, [] ); |
| 469 | $this->logger->error( __METHOD__ . ": Failed to load $code" ); |
| 470 | // This used to throw an exception, but that led to nasty side effects like |
| 471 | // the whole wiki being instantly down if the memcached server died |
| 472 | } |
| 473 | |
| 474 | if ( !$this->isLanguageLoaded( $code ) ) { |
| 475 | throw new LogicException( "Process cache for '$code' should be set by now." ); |
| 476 | } |
| 477 | |
| 478 | $info = implode( ', ', $where ); |
| 479 | $this->logger->debug( __METHOD__ . ": Loading $code... $info" ); |
| 480 | |
| 481 | return $success; |
| 482 | } |
| 483 | |
| 484 | /** |
| 485 | * @param string $code |
| 486 | * @param string[] &$where List of debug comments |
| 487 | * @param int|null $mode Use MessageCache::FOR_UPDATE to use DB_PRIMARY |
| 488 | * @return true|string One (true, "cantacquire", "disabled") |
| 489 | */ |
| 490 | private function loadFromDBWithMainLock( $code, array &$where, $mode = null ) { |
| 491 | // If cache updates on all levels fail, give up on message overrides. |
| 492 | // This is to avoid easy site outages; see $saveSuccess comments below. |
| 493 | $statusKey = $this->clusterCache->makeKey( 'messages', $code, 'status' ); |
| 494 | $status = $this->clusterCache->get( $statusKey ); |
| 495 | if ( $status === 'error' ) { |
| 496 | $where[] = "could not load; method is still globally disabled"; |
| 497 | return 'disabled'; |
| 498 | } |
| 499 | |
| 500 | // Now let's regenerate |
| 501 | $where[] = 'loading from DB'; |
| 502 | |
| 503 | // Lock the cache to prevent conflicting writes. |
| 504 | // This lock is non-blocking so stale cache can quickly be used. |
| 505 | // Note that load() will call a blocking getReentrantScopedLock() |
| 506 | // after this if it really needs to wait for any current thread. |
| 507 | [ $scopedLock ] = $this->getReentrantScopedLock( $code, 0 ); |
| 508 | if ( !$scopedLock ) { |
| 509 | $where[] = 'could not acquire main lock'; |
| 510 | return 'cantacquire'; |
| 511 | } |
| 512 | |
| 513 | $cache = $this->loadFromDB( $code, $mode ); |
| 514 | $this->cache->set( $code, $cache ); |
| 515 | $saveSuccess = $this->saveToCaches( $cache, 'all', $code ); |
| 516 | |
| 517 | if ( !$saveSuccess ) { |
| 518 | /** |
| 519 | * Cache save has failed. |
| 520 | * |
| 521 | * There are two main scenarios where this could be a problem: |
| 522 | * - The cache is more than the maximum size (typically 1MB compressed). |
| 523 | * - Memcached has no space remaining in the relevant slab class. This is |
| 524 | * unlikely with recent versions of memcached. |
| 525 | * |
| 526 | * Either way, if there is a local cache, nothing bad will happen. If there |
| 527 | * is no local cache, disabling the message cache for all requests avoids |
| 528 | * incurring a loadFromDB() overhead on every request, and thus saves the |
| 529 | * wiki from complete downtime under moderate traffic conditions. |
| 530 | */ |
| 531 | if ( $this->srvCache instanceof EmptyBagOStuff ) { |
| 532 | $this->clusterCache->set( $statusKey, 'error', 60 * 5 ); |
| 533 | $where[] = 'could not save cache, disabled globally for 5 minutes'; |
| 534 | } else { |
| 535 | $where[] = "could not save global cache"; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | return true; |
| 540 | } |
| 541 | |
| 542 | /** |
| 543 | * @param string $code |
| 544 | * @param string[] &$where List of debug comments |
| 545 | * @param int|null $mode Use MessageCache::FOR_UPDATE to use DB_PRIMARY |
| 546 | * @return bool Success |
| 547 | */ |
| 548 | private function loadFromDBWithLocalLock( $code, array &$where, $mode = null ) { |
| 549 | $success = false; |
| 550 | $where[] = 'loading from DB using local lock'; |
| 551 | |
| 552 | $scopedLock = $this->srvCache->getScopedLock( |
| 553 | $this->srvCache->makeKey( 'messages', $code ), |
| 554 | self::WAIT_SEC, |
| 555 | self::LOCK_TTL, |
| 556 | __METHOD__ |
| 557 | ); |
| 558 | if ( $scopedLock ) { |
| 559 | $cache = $this->loadFromDB( $code, $mode ); |
| 560 | $this->cache->set( $code, $cache ); |
| 561 | $this->saveToCaches( $cache, 'local-only', $code ); |
| 562 | $success = true; |
| 563 | } |
| 564 | |
| 565 | return $success; |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * Loads cacheable messages from the database. Messages bigger than |
| 570 | * $wgMaxMsgCacheEntrySize are assigned a special value, and are loaded |
| 571 | * on-demand from the database later. |
| 572 | * |
| 573 | * @param string $code Language code |
| 574 | * @param int|null $mode Use MessageCache::FOR_UPDATE to skip process cache |
| 575 | * @return array Loaded messages for storing in caches |
| 576 | */ |
| 577 | private function loadFromDB( $code, $mode = null ) { |
| 578 | $icp = MediaWikiServices::getInstance()->getConnectionProvider(); |
| 579 | |
| 580 | $dbr = ( $mode === self::FOR_UPDATE ) ? $icp->getPrimaryDatabase() : $icp->getReplicaDatabase(); |
| 581 | |
| 582 | $cache = []; |
| 583 | |
| 584 | $mostused = []; // list of "<cased message key>/<code>" |
| 585 | if ( $this->adaptive && $code !== $this->contLangCode ) { |
| 586 | if ( !$this->cache->has( $this->contLangCode ) ) { |
| 587 | $this->load( $this->contLangCode ); |
| 588 | } |
| 589 | $mostused = array_keys( $this->cache->get( $this->contLangCode ) ); |
| 590 | foreach ( $mostused as $key => $value ) { |
| 591 | $mostused[$key] = "$value/$code"; |
| 592 | } |
| 593 | } |
| 594 | |
| 595 | // Common conditions |
| 596 | $conds = [ |
| 597 | 'page_is_redirect' => 0, |
| 598 | 'page_namespace' => NS_MEDIAWIKI, |
| 599 | ]; |
| 600 | if ( count( $mostused ) ) { |
| 601 | $conds['page_title'] = $mostused; |
| 602 | } elseif ( $code !== $this->contLangCode ) { |
| 603 | $conds[] = $dbr->expr( |
| 604 | 'page_title', |
| 605 | IExpression::LIKE, |
| 606 | new LikeValue( $dbr->anyString(), '/', $code ) |
| 607 | ); |
| 608 | } else { |
| 609 | // Effectively disallows use of '/' character in NS_MEDIAWIKI for uses |
| 610 | // other than language code. |
| 611 | $conds[] = $dbr->expr( |
| 612 | 'page_title', |
| 613 | IExpression::NOT_LIKE, |
| 614 | new LikeValue( $dbr->anyString(), '/', $dbr->anyString() ) |
| 615 | ); |
| 616 | } |
| 617 | |
| 618 | // Set the stubs for oversized software-defined messages in the main cache map |
| 619 | $res = $dbr->newSelectQueryBuilder() |
| 620 | ->select( [ 'page_title', 'page_latest' ] ) |
| 621 | ->from( 'page' ) |
| 622 | ->where( $conds ) |
| 623 | ->andWhere( $dbr->expr( 'page_len', '>', intval( $this->maxEntrySize ) ) ) |
| 624 | ->caller( __METHOD__ . "($code)-big" )->fetchResultSet(); |
| 625 | foreach ( $res as $row ) { |
| 626 | // Include entries/stubs for all keys in $mostused in adaptive mode |
| 627 | if ( $this->adaptive || $this->isMainCacheable( $row->page_title ) ) { |
| 628 | $cache[$row->page_title] = '!TOO BIG'; |
| 629 | } |
| 630 | // At least include revision ID so page changes are reflected in the hash |
| 631 | $cache['EXCESSIVE'][$row->page_title] = $row->page_latest; |
| 632 | } |
| 633 | |
| 634 | // RevisionStore cannot be injected as it would break the installer since |
| 635 | // it instantiates MessageCache before the DB. |
| 636 | $revisionStore = MediaWikiServices::getInstance()->getRevisionStore(); |
| 637 | // Set the text for small software-defined messages in the main cache map |
| 638 | $revQuery = $revisionStore->getQueryInfo( [ 'page' ] ); |
| 639 | |
| 640 | // T231196: MySQL/MariaDB (10.1.37) can sometimes irrationally decide that querying `actor` then |
| 641 | // `revision` then `page` is somehow better than starting with `page`. Tell it not to reorder the |
| 642 | // query (and also reorder it ourselves because as generated by RevisionStore it'll have |
| 643 | // `revision` first rather than `page`). |
| 644 | $revQuery['joins']['revision'] = $revQuery['joins']['page']; |
| 645 | unset( $revQuery['joins']['page'] ); |
| 646 | // It isn't actually necessary to reorder $revQuery['tables'] as Database does the right thing |
| 647 | // when join conditions are given for all joins, but Gergő is wary of relying on that so pull |
| 648 | // `page` to the start. |
| 649 | $revQuery['tables'] = array_merge( |
| 650 | [ 'page' ], |
| 651 | array_diff( $revQuery['tables'], [ 'page' ] ) |
| 652 | ); |
| 653 | |
| 654 | $res = $dbr->newSelectQueryBuilder() |
| 655 | ->queryInfo( $revQuery ) |
| 656 | ->where( $conds ) |
| 657 | ->andWhere( [ |
| 658 | $dbr->expr( 'page_len', '<=', intval( $this->maxEntrySize ) ), |
| 659 | 'page_latest = rev_id' // get the latest revision only |
| 660 | ] ) |
| 661 | ->caller( __METHOD__ . "($code)-small" ) |
| 662 | ->straightJoinOption() |
| 663 | ->fetchResultSet(); |
| 664 | |
| 665 | // Don't load content from uncacheable rows (T313004) |
| 666 | [ $cacheableRows, $uncacheableRows ] = $this->separateCacheableRows( $res ); |
| 667 | $result = $revisionStore->newRevisionsFromBatch( $cacheableRows, [ |
| 668 | 'slots' => [ SlotRecord::MAIN ], |
| 669 | 'content' => true |
| 670 | ] ); |
| 671 | $revisions = $result->isOK() ? $result->getValue() : []; |
| 672 | |
| 673 | foreach ( $cacheableRows as $row ) { |
| 674 | try { |
| 675 | $rev = $revisions[$row->rev_id] ?? null; |
| 676 | $content = $rev ? $rev->getContent( SlotRecord::MAIN ) : null; |
| 677 | $text = $this->getMessageTextFromContent( $content ); |
| 678 | } catch ( TimeoutException $e ) { |
| 679 | throw $e; |
| 680 | } catch ( Exception $ex ) { |
| 681 | $text = false; |
| 682 | } |
| 683 | |
| 684 | if ( !is_string( $text ) ) { |
| 685 | $entry = '!ERROR'; |
| 686 | $this->logger->error( |
| 687 | __METHOD__ |
| 688 | . ": failed to load message page text for {$row->page_title} ($code)" |
| 689 | ); |
| 690 | } else { |
| 691 | $entry = ' ' . $text; |
| 692 | } |
| 693 | $cache[$row->page_title] = $entry; |
| 694 | } |
| 695 | |
| 696 | foreach ( $uncacheableRows as $row ) { |
| 697 | // T193271: The cache object gets too big and slow to generate. |
| 698 | // At least include revision ID, so that page changes are reflected in the hash. |
| 699 | $cache['EXCESSIVE'][$row->page_title] = $row->page_latest; |
| 700 | } |
| 701 | |
| 702 | $cache['VERSION'] = MSG_CACHE_VERSION; |
| 703 | ksort( $cache ); |
| 704 | |
| 705 | // Hash for validating local cache (APC). No need to take into account |
| 706 | // messages larger than $wgMaxMsgCacheEntrySize, since those are only |
| 707 | // stored and fetched from memcache. |
| 708 | $cache['HASH'] = md5( serialize( $cache ) ); |
| 709 | $cache['EXPIRY'] = wfTimestamp( TS_MW, time() + self::WAN_TTL ); |
| 710 | unset( $cache['EXCESSIVE'] ); // only needed for hash |
| 711 | |
| 712 | return $cache; |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * Whether the language was loaded and its data is still in the process cache. |
| 717 | * |
| 718 | * @param string $lang |
| 719 | * @return bool |
| 720 | */ |
| 721 | private function isLanguageLoaded( $lang ) { |
| 722 | // It is important that this only returns true if the cache was fully |
| 723 | // populated by load(), so that callers can assume all cache keys exist. |
| 724 | // It is possible for $this->cache to be only partially populated through |
| 725 | // methods like MessageCache::replace(), which must not make this method |
| 726 | // return true (T208897). And this method must cease to return true |
| 727 | // if the language was evicted by MapCacheLRU (T230690). |
| 728 | return $this->cache->hasField( $lang, 'VERSION' ); |
| 729 | } |
| 730 | |
| 731 | /** |
| 732 | * Can the given DB key be added to the main cache blob? To reduce the |
| 733 | * abuse impact of the MediaWiki namespace by {{int:}} and CentralNotice, |
| 734 | * this is only true if the page overrides a predefined message. |
| 735 | * |
| 736 | * @param string $name Message name (possibly with /code suffix) |
| 737 | * @param string|null $code The language code. If this is null, message |
| 738 | * presence will be bulk loaded for the content language. Otherwise, |
| 739 | * presence will be detected by loading the specified message. |
| 740 | * @return bool |
| 741 | */ |
| 742 | private function isMainCacheable( $name, $code = null ) { |
| 743 | // Convert the first letter to lowercase, and strip /code suffix |
| 744 | $name = $this->contLang->lcfirst( $name ); |
| 745 | // Include common conversion table pages. This also avoids problems with |
| 746 | // Installer::parse() bailing out due to disallowed DB queries (T207979). |
| 747 | if ( strpos( $name, 'conversiontable/' ) === 0 ) { |
| 748 | return true; |
| 749 | } |
| 750 | $msg = preg_replace( '/\/[a-z0-9-]{2,}$/', '', $name ); |
| 751 | |
| 752 | if ( $code === null ) { |
| 753 | // Bulk load |
| 754 | if ( $this->systemMessageNames === null ) { |
| 755 | $this->systemMessageNames = array_fill_keys( |
| 756 | $this->localisationCache->getSubitemList( $this->contLangCode, 'messages' ), |
| 757 | true ); |
| 758 | } |
| 759 | return isset( $this->systemMessageNames[$msg] ); |
| 760 | } else { |
| 761 | // Use individual subitem |
| 762 | return $this->localisationCache->getSubitem( $code, 'messages', $msg ) !== null; |
| 763 | } |
| 764 | } |
| 765 | |
| 766 | /** |
| 767 | * Separate cacheable from uncacheable rows in a page/revsion query result. |
| 768 | * |
| 769 | * @param IResultWrapper $res |
| 770 | * @return array{0:IResultWrapper|stdClass[],1:stdClass[]} An array with the cacheable |
| 771 | * rows in the first element and the uncacheable rows in the second. |
| 772 | */ |
| 773 | private function separateCacheableRows( $res ) { |
| 774 | if ( $this->adaptive ) { |
| 775 | // Include entries/stubs for all keys in $mostused in adaptive mode |
| 776 | return [ $res, [] ]; |
| 777 | } |
| 778 | $cacheableRows = []; |
| 779 | $uncacheableRows = []; |
| 780 | foreach ( $res as $row ) { |
| 781 | if ( $this->isMainCacheable( $row->page_title ) ) { |
| 782 | $cacheableRows[] = $row; |
| 783 | } else { |
| 784 | $uncacheableRows[] = $row; |
| 785 | } |
| 786 | } |
| 787 | return [ $cacheableRows, $uncacheableRows ]; |
| 788 | } |
| 789 | |
| 790 | /** |
| 791 | * Updates cache as necessary when message page is changed |
| 792 | * |
| 793 | * @param string $title Message cache key with the initial uppercase letter |
| 794 | * @param string|false $text New contents of the page (false if deleted) |
| 795 | */ |
| 796 | public function replace( $title, $text ) { |
| 797 | if ( $this->disable ) { |
| 798 | return; |
| 799 | } |
| 800 | |
| 801 | [ $msg, $code ] = $this->figureMessage( $title ); |
| 802 | if ( strpos( $title, '/' ) !== false && $code === $this->contLangCode ) { |
| 803 | // Content language overrides do not use the /<code> suffix |
| 804 | return; |
| 805 | } |
| 806 | |
| 807 | // (a) Update the process cache with the new message text |
| 808 | if ( $text === false ) { |
| 809 | // Page deleted |
| 810 | $this->cache->setField( $code, $title, '!NONEXISTENT' ); |
| 811 | } else { |
| 812 | // Ignore $wgMaxMsgCacheEntrySize so the process cache is up-to-date |
| 813 | $this->cache->setField( $code, $title, ' ' . $text ); |
| 814 | } |
| 815 | |
| 816 | // (b) Update the shared caches in a deferred update with a fresh DB snapshot |
| 817 | DeferredUpdates::addUpdate( |
| 818 | new MessageCacheUpdate( $code, $title, $msg ), |
| 819 | DeferredUpdates::PRESEND |
| 820 | ); |
| 821 | } |
| 822 | |
| 823 | /** |
| 824 | * @param string $code |
| 825 | * @param array[] $replacements List of (title, message key) pairs |
| 826 | */ |
| 827 | public function refreshAndReplaceInternal( string $code, array $replacements ) { |
| 828 | // Allow one caller at a time to avoid race conditions |
| 829 | [ $scopedLock ] = $this->getReentrantScopedLock( $code ); |
| 830 | if ( !$scopedLock ) { |
| 831 | foreach ( $replacements as [ $title ] ) { |
| 832 | $this->logger->error( |
| 833 | __METHOD__ . ': could not acquire lock to update {title} ({code})', |
| 834 | [ 'title' => $title, 'code' => $code ] ); |
| 835 | } |
| 836 | |
| 837 | return; |
| 838 | } |
| 839 | |
| 840 | // Load the existing cache to update it in the local DC cache. |
| 841 | // The other DCs will see a hash mismatch. |
| 842 | if ( $this->load( $code, self::FOR_UPDATE ) ) { |
| 843 | $cache = $this->cache->get( $code ); |
| 844 | } else { |
| 845 | // Err? Fall back to loading from the database. |
| 846 | $cache = $this->loadFromDB( $code, self::FOR_UPDATE ); |
| 847 | } |
| 848 | // Check if individual cache keys should exist and update cache accordingly |
| 849 | $newTextByTitle = []; // map of (title => content) |
| 850 | $newBigTitles = []; // map of (title => latest revision ID), like EXCESSIVE in loadFromDB() |
| 851 | // Can not inject the WikiPageFactory as it would break the installer since |
| 852 | // it instantiates MessageCache before the DB. |
| 853 | $wikiPageFactory = MediaWikiServices::getInstance()->getWikiPageFactory(); |
| 854 | foreach ( $replacements as [ $title ] ) { |
| 855 | $page = $wikiPageFactory->newFromTitle( Title::makeTitle( NS_MEDIAWIKI, $title ) ); |
| 856 | $page->loadPageData( IDBAccessObject::READ_LATEST ); |
| 857 | $text = $this->getMessageTextFromContent( $page->getContent() ); |
| 858 | // Remember the text for the blob store update later on |
| 859 | $newTextByTitle[$title] = $text ?? ''; |
| 860 | // Note that if $text is false, then $cache should have a !NONEXISTANT entry |
| 861 | if ( !is_string( $text ) ) { |
| 862 | $cache[$title] = '!NONEXISTENT'; |
| 863 | } elseif ( strlen( $text ) > $this->maxEntrySize ) { |
| 864 | $cache[$title] = '!TOO BIG'; |
| 865 | $newBigTitles[$title] = $page->getLatest(); |
| 866 | } else { |
| 867 | $cache[$title] = ' ' . $text; |
| 868 | } |
| 869 | } |
| 870 | // Update HASH for the new key. Incorporates various administrative keys, |
| 871 | // including the old HASH (and thereby the EXCESSIVE value from loadFromDB() |
| 872 | // and previous replace() calls), but that doesn't really matter since we |
| 873 | // only ever compare it for equality with a copy saved by saveToCaches(). |
| 874 | $cache['HASH'] = md5( serialize( $cache + [ 'EXCESSIVE' => $newBigTitles ] ) ); |
| 875 | // Update the too-big WAN cache entries now that we have the new HASH |
| 876 | foreach ( $newBigTitles as $title => $id ) { |
| 877 | // Match logic of loadCachedMessagePageEntry() |
| 878 | $this->wanCache->set( |
| 879 | $this->bigMessageCacheKey( $cache['HASH'], $title ), |
| 880 | ' ' . $newTextByTitle[$title], |
| 881 | self::WAN_TTL |
| 882 | ); |
| 883 | } |
| 884 | // Mark this cache as definitely being "latest" (non-volatile) so |
| 885 | // load() calls do not try to refresh the cache with replica DB data |
| 886 | $cache['LATEST'] = time(); |
| 887 | // Update the process cache |
| 888 | $this->cache->set( $code, $cache ); |
| 889 | // Pre-emptively update the local datacenter cache so things like edit filter and |
| 890 | // prevented changes are reflected immediately; these often use MediaWiki: pages. |
| 891 | // The datacenter handling replace() calls should be the same one handling edits |
| 892 | // as they require HTTP POST. |
| 893 | $this->saveToCaches( $cache, 'all', $code ); |
| 894 | // Release the lock now that the cache is saved |
| 895 | ScopedCallback::consume( $scopedLock ); |
| 896 | |
| 897 | // Relay the purge. Touching this check key expires cache contents |
| 898 | // and local cache (APC) validation hash across all datacenters. |
| 899 | $this->wanCache->touchCheckKey( $this->getCheckKey( $code ) ); |
| 900 | |
| 901 | // Purge the messages in the message blob store and fire any hook handlers |
| 902 | $blobStore = MediaWikiServices::getInstance()->getResourceLoader()->getMessageBlobStore(); |
| 903 | foreach ( $replacements as [ $title, $msg ] ) { |
| 904 | $blobStore->updateMessage( $this->contLang->lcfirst( $msg ) ); |
| 905 | $this->hookRunner->onMessageCacheReplace( $title, $newTextByTitle[$title] ); |
| 906 | } |
| 907 | } |
| 908 | |
| 909 | /** |
| 910 | * Is the given cache array expired due-to-time passing or a version change? |
| 911 | * |
| 912 | * @param array $cache |
| 913 | * @return bool |
| 914 | */ |
| 915 | private function isCacheExpired( $cache ) { |
| 916 | return !isset( $cache['VERSION'] ) || |
| 917 | !isset( $cache['EXPIRY'] ) || |
| 918 | $cache['VERSION'] !== MSG_CACHE_VERSION || |
| 919 | $cache['EXPIRY'] <= wfTimestampNow(); |
| 920 | } |
| 921 | |
| 922 | /** |
| 923 | * Shortcut to update caches. |
| 924 | * |
| 925 | * @param array $cache Cached messages with a version. |
| 926 | * @param string $dest Either "local-only" to save to local caches only |
| 927 | * or "all" to save to all caches. |
| 928 | * @param string|false $code Language code (default: false) |
| 929 | * @return bool |
| 930 | */ |
| 931 | private function saveToCaches( array $cache, $dest, $code = false ) { |
| 932 | if ( $dest === 'all' ) { |
| 933 | $cacheKey = $this->clusterCache->makeKey( 'messages', $code ); |
| 934 | $success = $this->clusterCache->set( $cacheKey, $cache ); |
| 935 | $this->setValidationHash( $code, $cache ); |
| 936 | } else { |
| 937 | $success = true; |
| 938 | } |
| 939 | |
| 940 | $this->saveToLocalCache( $code, $cache ); |
| 941 | |
| 942 | return $success; |
| 943 | } |
| 944 | |
| 945 | /** |
| 946 | * Get the md5 used to validate the local server cache |
| 947 | * |
| 948 | * @param string $code |
| 949 | * @return array (hash or false, bool expiry/volatility status) |
| 950 | */ |
| 951 | private function getValidationHash( $code ) { |
| 952 | $curTTL = null; |
| 953 | $value = $this->wanCache->get( |
| 954 | $this->wanCache->makeKey( 'messages', $code, 'hash', 'v1' ), |
| 955 | $curTTL, |
| 956 | [ $this->getCheckKey( $code ) ] |
| 957 | ); |
| 958 | |
| 959 | if ( $value ) { |
| 960 | $hash = $value['hash']; |
| 961 | if ( ( time() - $value['latest'] ) < WANObjectCache::TTL_MINUTE ) { |
| 962 | // Cache was recently updated via replace() and should be up-to-date. |
| 963 | // That method is only called in the primary datacenter and uses FOR_UPDATE. |
| 964 | $expired = false; |
| 965 | } else { |
| 966 | // See if the "check" key was bumped after the hash was generated |
| 967 | $expired = ( $curTTL < 0 ); |
| 968 | } |
| 969 | } else { |
| 970 | // No hash found at all; cache must regenerate to be safe |
| 971 | $hash = false; |
| 972 | $expired = true; |
| 973 | } |
| 974 | |
| 975 | return [ $hash, $expired ]; |
| 976 | } |
| 977 | |
| 978 | /** |
| 979 | * Set the md5 used to validate the local server cache |
| 980 | * |
| 981 | * If $cache has a 'LATEST' UNIX timestamp key, then the hash will not |
| 982 | * be treated as "volatile" by getValidationHash() for the next few seconds. |
| 983 | * This is triggered when $cache is generated using FOR_UPDATE mode. |
| 984 | * |
| 985 | * @param string $code |
| 986 | * @param array $cache Cached messages with a version |
| 987 | */ |
| 988 | private function setValidationHash( $code, array $cache ) { |
| 989 | $this->wanCache->set( |
| 990 | $this->wanCache->makeKey( 'messages', $code, 'hash', 'v1' ), |
| 991 | [ |
| 992 | 'hash' => $cache['HASH'], |
| 993 | 'latest' => $cache['LATEST'] ?? 0 |
| 994 | ], |
| 995 | WANObjectCache::TTL_INDEFINITE |
| 996 | ); |
| 997 | } |
| 998 | |
| 999 | /** |
| 1000 | * @param string $code Which language to load messages for |
| 1001 | * @param int $timeout Wait timeout in seconds |
| 1002 | * @return array (ScopedCallback or null, whether locking failed due to an I/O error) |
| 1003 | * @phan-return array{0:ScopedCallback|null,1:bool} |
| 1004 | */ |
| 1005 | private function getReentrantScopedLock( $code, $timeout = self::WAIT_SEC ) { |
| 1006 | $key = $this->clusterCache->makeKey( 'messages', $code ); |
| 1007 | |
| 1008 | $watchPoint = $this->clusterCache->watchErrors(); |
| 1009 | $scopedLock = $this->clusterCache->getScopedLock( |
| 1010 | $key, |
| 1011 | $timeout, |
| 1012 | self::LOCK_TTL, |
| 1013 | __METHOD__ |
| 1014 | ); |
| 1015 | $error = ( !$scopedLock && $this->clusterCache->getLastError( $watchPoint ) ); |
| 1016 | |
| 1017 | return [ $scopedLock, $error ]; |
| 1018 | } |
| 1019 | |
| 1020 | /** |
| 1021 | * Get a message from either the content language or the user language. |
| 1022 | * |
| 1023 | * First, assemble a list of languages to attempt getting the message from. This |
| 1024 | * chain begins with the requested language and its fallbacks and then continues with |
| 1025 | * the content language and its fallbacks. For each language in the chain, the following |
| 1026 | * process will occur (in this order): |
| 1027 | * 1. If a language-specific override, i.e., [[MW:msg/lang]], is available, use that. |
| 1028 | * Note: for the content language, there is no /lang subpage. |
| 1029 | * 2. Fetch from the static CDB cache. |
| 1030 | * 3. If available, check the database for fallback language overrides. |
| 1031 | * |
| 1032 | * This process provides a number of guarantees. When changing this code, make sure all |
| 1033 | * of these guarantees are preserved. |
| 1034 | * * If the requested language is *not* the content language, then the CDB cache for that |
| 1035 | * specific language will take precedence over the root database page ([[MW:msg]]). |
| 1036 | * * Fallbacks will be just that: fallbacks. A fallback language will never be reached if |
| 1037 | * the message is available *anywhere* in the language for which it is a fallback. |
| 1038 | * |
| 1039 | * @param string $key The message key |
| 1040 | * @param bool $useDB If true, look for the message in the DB, false |
| 1041 | * to use only the compiled l10n cache. |
| 1042 | * @param bool|string|Language|null $language Code of the language to get the message for. |
| 1043 | * - If string and a valid code, will create a standard language object |
| 1044 | * - If string but not a valid code, will create a basic language object |
| 1045 | * - If false, create object from the current users language |
| 1046 | * - If true or null, create object from the wikis content language |
| 1047 | * - If language object, use it as given |
| 1048 | * - If this parameter omitted the object from the wikis content language is used |
| 1049 | * - Other values than a Language object or null are deprecated. |
| 1050 | * @param string &$usedKey @phan-output-reference If given, will be set to the message key |
| 1051 | * that the message was fetched from (the requested key may be overridden by hooks). |
| 1052 | * |
| 1053 | * @return string|false False if the message doesn't exist, otherwise the |
| 1054 | * message (which can be empty) |
| 1055 | */ |
| 1056 | public function get( $key, $useDB = true, $language = null, &$usedKey = '' ) { |
| 1057 | if ( is_int( $key ) ) { |
| 1058 | // Fix numerical strings that somehow become ints on their way here |
| 1059 | $key = (string)$key; |
| 1060 | } elseif ( !is_string( $key ) ) { |
| 1061 | throw new TypeError( 'Message key must be a string' ); |
| 1062 | } elseif ( $key === '' ) { |
| 1063 | // Shortcut: the empty key is always missing |
| 1064 | return false; |
| 1065 | } |
| 1066 | |
| 1067 | $language ??= $this->contLang; |
| 1068 | $language = $this->getLanguageObject( $language ); |
| 1069 | |
| 1070 | // Normalise title-case input (with some inlining) |
| 1071 | $lckey = self::normalizeKey( $key ); |
| 1072 | |
| 1073 | // Initialize the overrides here to prevent calling the hook too early. |
| 1074 | if ( $this->messageKeyOverrides === null ) { |
| 1075 | $this->messageKeyOverrides = []; |
| 1076 | $this->hookRunner->onMessageCacheFetchOverrides( $this->messageKeyOverrides ); |
| 1077 | } |
| 1078 | |
| 1079 | if ( isset( $this->messageKeyOverrides[$lckey] ) ) { |
| 1080 | $override = $this->messageKeyOverrides[$lckey]; |
| 1081 | |
| 1082 | // Strings are deliberately interpreted as message keys, |
| 1083 | // to prevent ambiguity between message keys and functions. |
| 1084 | if ( is_string( $override ) ) { |
| 1085 | $lckey = $override; |
| 1086 | } else { |
| 1087 | $lckey = $override( $lckey, $this, $language, $useDB ); |
| 1088 | } |
| 1089 | } |
| 1090 | |
| 1091 | $this->hookRunner->onMessageCache__get( $lckey ); |
| 1092 | |
| 1093 | $usedKey = $lckey; |
| 1094 | |
| 1095 | // Loop through each language in the fallback list until we find something useful |
| 1096 | $message = $this->getMessageFromFallbackChain( |
| 1097 | $language, |
| 1098 | $lckey, |
| 1099 | !$this->disable && $useDB |
| 1100 | ); |
| 1101 | |
| 1102 | // If we still have no message, maybe the key was in fact a full key so try that |
| 1103 | if ( $message === false ) { |
| 1104 | $parts = explode( '/', $lckey ); |
| 1105 | // We may get calls for things that are http-urls from sidebar |
| 1106 | // Let's not load nonexistent languages for those |
| 1107 | // They usually have more than one slash. |
| 1108 | if ( count( $parts ) === 2 && $parts[1] !== '' ) { |
| 1109 | $message = $this->localisationCache->getSubitem( $parts[1], 'messages', $parts[0] ) ?? false; |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | // Post-processing if the message exists |
| 1114 | if ( $message !== false ) { |
| 1115 | // Fix whitespace |
| 1116 | $message = str_replace( |
| 1117 | [ |
| 1118 | // Fix for trailing whitespace, removed by textarea |
| 1119 | ' ', |
| 1120 | // Fix for NBSP, converted to space by firefox |
| 1121 | ' ', |
| 1122 | ' ', |
| 1123 | '­' |
| 1124 | ], |
| 1125 | [ |
| 1126 | ' ', |
| 1127 | "\u{00A0}", |
| 1128 | "\u{00A0}", |
| 1129 | "\u{00AD}" |
| 1130 | ], |
| 1131 | $message |
| 1132 | ); |
| 1133 | } |
| 1134 | |
| 1135 | return $message; |
| 1136 | } |
| 1137 | |
| 1138 | /** |
| 1139 | * Return a Language object from $langcode |
| 1140 | * |
| 1141 | * @param Language|string|bool $langcode Either: |
| 1142 | * - a Language object |
| 1143 | * - code of the language to get the message for, if it is |
| 1144 | * a valid code create a language for that language, if |
| 1145 | * it is a string but not a valid code then make a basic |
| 1146 | * language object |
| 1147 | * - a boolean: if it's false then use the global object for |
| 1148 | * the current user's language (as a fallback for the old parameter |
| 1149 | * functionality), or if it is true then use global object |
| 1150 | * for the wiki's content language. |
| 1151 | * @return Language|StubUserLang |
| 1152 | */ |
| 1153 | private function getLanguageObject( $langcode ) { |
| 1154 | # Identify which language to get or create a language object for. |
| 1155 | # Using is_object here due to Stub objects. |
| 1156 | if ( is_object( $langcode ) ) { |
| 1157 | # Great, we already have the object (hopefully)! |
| 1158 | return $langcode; |
| 1159 | } |
| 1160 | |
| 1161 | wfDeprecated( __METHOD__ . ' with not a Language object in $langcode', '1.43' ); |
| 1162 | if ( $langcode === true || $langcode === $this->contLangCode ) { |
| 1163 | # $langcode is the language code of the wikis content language object. |
| 1164 | # or it is a boolean and value is true |
| 1165 | return $this->contLang; |
| 1166 | } |
| 1167 | |
| 1168 | global $wgLang; |
| 1169 | if ( $langcode === false || $langcode === $wgLang->getCode() ) { |
| 1170 | # $langcode is the language code of user language object. |
| 1171 | # or it was a boolean and value is false |
| 1172 | return $wgLang; |
| 1173 | } |
| 1174 | |
| 1175 | $validCodes = array_keys( $this->languageNameUtils->getLanguageNames() ); |
| 1176 | if ( in_array( $langcode, $validCodes ) ) { |
| 1177 | # $langcode corresponds to a valid language. |
| 1178 | return $this->langFactory->getLanguage( $langcode ); |
| 1179 | } |
| 1180 | |
| 1181 | # $langcode is a string, but not a valid language code; use content language. |
| 1182 | $this->logger->debug( 'Invalid language code passed to' . __METHOD__ . ', falling back to content language.' ); |
| 1183 | return $this->contLang; |
| 1184 | } |
| 1185 | |
| 1186 | /** |
| 1187 | * Given a language, try and fetch messages from that language. |
| 1188 | * |
| 1189 | * Will also consider fallbacks of that language, the site language, and fallbacks for |
| 1190 | * the site language. |
| 1191 | * |
| 1192 | * @see MessageCache::get |
| 1193 | * @param Language|StubObject $lang Preferred language |
| 1194 | * @param string $lckey Lowercase key for the message (as for localisation cache) |
| 1195 | * @param bool $useDB Whether to include messages from the wiki database |
| 1196 | * @return string|false The message, or false if not found |
| 1197 | */ |
| 1198 | private function getMessageFromFallbackChain( $lang, $lckey, $useDB ) { |
| 1199 | $alreadyTried = []; |
| 1200 | |
| 1201 | // First try the requested language. |
| 1202 | $message = $this->getMessageForLang( $lang, $lckey, $useDB, $alreadyTried ); |
| 1203 | if ( $message !== false ) { |
| 1204 | return $message; |
| 1205 | } |
| 1206 | |
| 1207 | // Now try checking the site language. |
| 1208 | $message = $this->getMessageForLang( $this->contLang, $lckey, $useDB, $alreadyTried ); |
| 1209 | return $message; |
| 1210 | } |
| 1211 | |
| 1212 | /** |
| 1213 | * Given a language, try and fetch messages from that language and its fallbacks. |
| 1214 | * |
| 1215 | * @see MessageCache::get |
| 1216 | * @param Language|StubObject $lang Preferred language |
| 1217 | * @param string $lckey Lowercase key for the message (as for localisation cache) |
| 1218 | * @param bool $useDB Whether to include messages from the wiki database |
| 1219 | * @param bool[] &$alreadyTried Contains true for each language that has been tried already |
| 1220 | * @return string|false The message, or false if not found |
| 1221 | */ |
| 1222 | private function getMessageForLang( $lang, $lckey, $useDB, &$alreadyTried ) { |
| 1223 | $langcode = $lang->getCode(); |
| 1224 | |
| 1225 | // Try checking the database for the requested language |
| 1226 | if ( $useDB ) { |
| 1227 | $uckey = $this->contLang->ucfirst( $lckey ); |
| 1228 | |
| 1229 | if ( !isset( $alreadyTried[$langcode] ) ) { |
| 1230 | $message = $this->getMsgFromNamespace( |
| 1231 | $this->getMessagePageName( $langcode, $uckey ), |
| 1232 | $langcode |
| 1233 | ); |
| 1234 | if ( $message !== false ) { |
| 1235 | return $message; |
| 1236 | } |
| 1237 | $alreadyTried[$langcode] = true; |
| 1238 | } |
| 1239 | } else { |
| 1240 | $uckey = null; |
| 1241 | } |
| 1242 | |
| 1243 | // Return a special value handled in Message::format() to display the message key |
| 1244 | // (and fallback keys) and the parameters passed to the message. |
| 1245 | // TODO: Move to a better place. |
| 1246 | if ( $langcode === 'qqx' ) { |
| 1247 | return '($*)'; |
| 1248 | } elseif ( |
| 1249 | $langcode === 'x-xss' && |
| 1250 | $this->useXssLanguage && |
| 1251 | !in_array( $lckey, $this->rawHtmlMessages, true ) |
| 1252 | ) { |
| 1253 | $xssViaInnerHtml = "<script>alert('$lckey')</script>"; |
| 1254 | $xssViaAttribute = '">' . $xssViaInnerHtml . '<x y="'; |
| 1255 | return $xssViaInnerHtml . $xssViaAttribute . '($*)'; |
| 1256 | } |
| 1257 | |
| 1258 | // Check the localisation cache |
| 1259 | [ $defaultMessage, $messageSource ] = |
| 1260 | $this->localisationCache->getSubitemWithSource( $langcode, 'messages', $lckey ); |
| 1261 | if ( $messageSource === $langcode ) { |
| 1262 | return $defaultMessage; |
| 1263 | } |
| 1264 | |
| 1265 | // Try checking the database for all of the fallback languages |
| 1266 | if ( $useDB ) { |
| 1267 | $fallbackChain = $this->languageFallback->getAll( $langcode ); |
| 1268 | |
| 1269 | foreach ( $fallbackChain as $code ) { |
| 1270 | if ( isset( $alreadyTried[$code] ) ) { |
| 1271 | continue; |
| 1272 | } |
| 1273 | |
| 1274 | $message = $this->getMsgFromNamespace( |
| 1275 | // @phan-suppress-next-line PhanTypeMismatchArgumentNullable uckey is set when used |
| 1276 | $this->getMessagePageName( $code, $uckey ), $code ); |
| 1277 | |
| 1278 | if ( $message !== false ) { |
| 1279 | return $message; |
| 1280 | } |
| 1281 | $alreadyTried[$code] = true; |
| 1282 | |
| 1283 | // Reached the source language of the default message. Don't look for DB overrides |
| 1284 | // further back in the fallback chain. (T229992) |
| 1285 | if ( $code === $messageSource ) { |
| 1286 | return $defaultMessage; |
| 1287 | } |
| 1288 | } |
| 1289 | } |
| 1290 | |
| 1291 | return $defaultMessage ?? false; |
| 1292 | } |
| 1293 | |
| 1294 | /** |
| 1295 | * Get the message page name for a given language |
| 1296 | * |
| 1297 | * @param string $langcode |
| 1298 | * @param string $uckey Uppercase key for the message |
| 1299 | * @return string The page name |
| 1300 | */ |
| 1301 | private function getMessagePageName( $langcode, $uckey ) { |
| 1302 | if ( $langcode === $this->contLangCode ) { |
| 1303 | // Messages created in the content language will not have the /lang extension |
| 1304 | return $uckey; |
| 1305 | } else { |
| 1306 | return "$uckey/$langcode"; |
| 1307 | } |
| 1308 | } |
| 1309 | |
| 1310 | /** |
| 1311 | * Get a message from the MediaWiki namespace, with caching. The key must |
| 1312 | * first be converted to two-part lang/msg form if necessary. |
| 1313 | * |
| 1314 | * Unlike self::get(), this function doesn't resolve fallback chains, and |
| 1315 | * some callers require this behavior. LanguageConverter::parseCachedTable() |
| 1316 | * and self::get() are some examples in core. |
| 1317 | * |
| 1318 | * @param string $title Message cache key with the initial uppercase letter |
| 1319 | * @param string $code Code denoting the language to try |
| 1320 | * @return string|false The message, or false if it does not exist or on error |
| 1321 | */ |
| 1322 | public function getMsgFromNamespace( $title, $code ) { |
| 1323 | // Load all MediaWiki page definitions into cache. Note that individual keys |
| 1324 | // already loaded into the cache during this request remain in the cache, which |
| 1325 | // includes the value of hook-defined messages. |
| 1326 | $this->load( $code ); |
| 1327 | |
| 1328 | $entry = $this->cache->getField( $code, $title ); |
| 1329 | |
| 1330 | if ( $entry !== null ) { |
| 1331 | // Message page exists as an override of a software messages |
| 1332 | if ( substr( $entry, 0, 1 ) === ' ' ) { |
| 1333 | // The message exists and is not '!TOO BIG' or '!ERROR' |
| 1334 | return (string)substr( $entry, 1 ); |
| 1335 | } elseif ( $entry === '!NONEXISTENT' ) { |
| 1336 | // The text might be '-' or missing due to some data loss |
| 1337 | return false; |
| 1338 | } |
| 1339 | // Load the message page, utilizing the individual message cache. |
| 1340 | // If the page does not exist, there will be no hook handler fallbacks. |
| 1341 | $entry = $this->loadCachedMessagePageEntry( |
| 1342 | $title, |
| 1343 | $code, |
| 1344 | $this->cache->getField( $code, 'HASH' ) |
| 1345 | ); |
| 1346 | } else { |
| 1347 | // Message page either does not exist or does not override a software message |
| 1348 | if ( !$this->isMainCacheable( $title, $code ) ) { |
| 1349 | // Message page does not override any software-defined message. A custom |
| 1350 | // message might be defined to have content or settings specific to the wiki. |
| 1351 | // Load the message page, utilizing the individual message cache as needed. |
| 1352 | $entry = $this->loadCachedMessagePageEntry( |
| 1353 | $title, |
| 1354 | $code, |
| 1355 | $this->cache->getField( $code, 'HASH' ) |
| 1356 | ); |
| 1357 | } |
| 1358 | if ( $entry === null || substr( $entry, 0, 1 ) !== ' ' ) { |
| 1359 | // Message does not have a MediaWiki page definition; try hook handlers |
| 1360 | $message = false; |
| 1361 | // @phan-suppress-next-line PhanTypeMismatchArgument Type mismatch on pass-by-ref args |
| 1362 | $this->hookRunner->onMessagesPreLoad( $title, $message, $code ); |
| 1363 | if ( $message !== false ) { |
| 1364 | $this->cache->setField( $code, $title, ' ' . $message ); |
| 1365 | } else { |
| 1366 | $this->cache->setField( $code, $title, '!NONEXISTENT' ); |
| 1367 | } |
| 1368 | |
| 1369 | return $message; |
| 1370 | } |
| 1371 | } |
| 1372 | |
| 1373 | if ( $entry !== false && substr( $entry, 0, 1 ) === ' ' ) { |
| 1374 | if ( $this->cacheVolatile[$code] ) { |
| 1375 | // Make sure that individual keys respect the WAN cache holdoff period too |
| 1376 | $this->logger->debug( |
| 1377 | __METHOD__ . ': loading volatile key \'{titleKey}\'', |
| 1378 | [ 'titleKey' => $title, 'code' => $code ] ); |
| 1379 | } else { |
| 1380 | $this->cache->setField( $code, $title, $entry ); |
| 1381 | } |
| 1382 | // The message exists, so make sure a string is returned |
| 1383 | return (string)substr( $entry, 1 ); |
| 1384 | } |
| 1385 | |
| 1386 | $this->cache->setField( $code, $title, '!NONEXISTENT' ); |
| 1387 | |
| 1388 | return false; |
| 1389 | } |
| 1390 | |
| 1391 | /** |
| 1392 | * @param string $dbKey |
| 1393 | * @param string $code |
| 1394 | * @param string $hash |
| 1395 | * @return string Either " <MESSAGE>" or "!NONEXISTANT" |
| 1396 | */ |
| 1397 | private function loadCachedMessagePageEntry( $dbKey, $code, $hash ) { |
| 1398 | $fname = __METHOD__; |
| 1399 | return $this->srvCache->getWithSetCallback( |
| 1400 | $this->srvCache->makeKey( 'messages-big', $hash, $dbKey ), |
| 1401 | BagOStuff::TTL_HOUR, |
| 1402 | function () use ( $code, $dbKey, $hash, $fname ) { |
| 1403 | return $this->wanCache->getWithSetCallback( |
| 1404 | $this->bigMessageCacheKey( $hash, $dbKey ), |
| 1405 | self::WAN_TTL, |
| 1406 | function ( $oldValue, &$ttl, &$setOpts ) use ( $dbKey, $code, $fname ) { |
| 1407 | // Try loading the message from the database |
| 1408 | $setOpts += Database::getCacheSetOptions( |
| 1409 | MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase() |
| 1410 | ); |
| 1411 | // Use newKnownCurrent() to avoid querying revision/user tables |
| 1412 | $title = Title::makeTitle( NS_MEDIAWIKI, $dbKey ); |
| 1413 | // Injecting RevisionStore breaks installer since it |
| 1414 | // instantiates MessageCache before DB. |
| 1415 | $revision = MediaWikiServices::getInstance() |
| 1416 | ->getRevisionLookup() |
| 1417 | ->getKnownCurrentRevision( $title ); |
| 1418 | if ( !$revision ) { |
| 1419 | // The wiki doesn't have a local override page. Cache absence with normal TTL. |
| 1420 | // When overrides are created, self::replace() takes care of the cache. |
| 1421 | return '!NONEXISTENT'; |
| 1422 | } |
| 1423 | $content = $revision->getContent( SlotRecord::MAIN ); |
| 1424 | if ( $content ) { |
| 1425 | $message = $this->getMessageTextFromContent( $content ); |
| 1426 | } else { |
| 1427 | $this->logger->warning( |
| 1428 | $fname . ': failed to load page text for \'{titleKey}\'', |
| 1429 | [ 'titleKey' => $dbKey, 'code' => $code ] |
| 1430 | ); |
| 1431 | $message = null; |
| 1432 | } |
| 1433 | |
| 1434 | if ( !is_string( $message ) ) { |
| 1435 | // Revision failed to load Content, or Content is incompatible with wikitext. |
| 1436 | // Possibly a temporary loading failure. |
| 1437 | $ttl = 5; |
| 1438 | |
| 1439 | return '!NONEXISTENT'; |
| 1440 | } |
| 1441 | |
| 1442 | return ' ' . $message; |
| 1443 | } |
| 1444 | ); |
| 1445 | } |
| 1446 | ); |
| 1447 | } |
| 1448 | |
| 1449 | /** |
| 1450 | * @param string $message |
| 1451 | * @param bool $interface |
| 1452 | * @param Language|null $language |
| 1453 | * @param PageReference|null $page |
| 1454 | * @return string |
| 1455 | */ |
| 1456 | public function transform( $message, $interface = false, $language = null, PageReference $page = null ) { |
| 1457 | // Avoid creating parser if nothing to transform |
| 1458 | if ( $this->inParser || !str_contains( $message, '{{' ) ) { |
| 1459 | return $message; |
| 1460 | } |
| 1461 | |
| 1462 | $parser = $this->getParser(); |
| 1463 | $popts = $this->getParserOptions(); |
| 1464 | $popts->setInterfaceMessage( $interface ); |
| 1465 | $popts->setTargetLanguage( $language ); |
| 1466 | |
| 1467 | $userlang = $popts->setUserLang( $language ); |
| 1468 | $this->inParser = true; |
| 1469 | $message = $parser->transformMsg( $message, $popts, $page ); |
| 1470 | $this->inParser = false; |
| 1471 | $popts->setUserLang( $userlang ); |
| 1472 | |
| 1473 | return $message; |
| 1474 | } |
| 1475 | |
| 1476 | /** |
| 1477 | * @return Parser |
| 1478 | */ |
| 1479 | public function getParser() { |
| 1480 | if ( !$this->parser ) { |
| 1481 | $this->parser = $this->parserFactory->create(); |
| 1482 | } |
| 1483 | |
| 1484 | return $this->parser; |
| 1485 | } |
| 1486 | |
| 1487 | /** |
| 1488 | * @param string $text |
| 1489 | * @param PageReference|null $page |
| 1490 | * @param bool $linestart Whether this is at the start of a line |
| 1491 | * @param bool $interface Whether this is an interface message |
| 1492 | * @param Language|StubUserLang|string|null $language Language code |
| 1493 | * @return ParserOutput|string |
| 1494 | */ |
| 1495 | public function parse( $text, PageReference $page = null, $linestart = true, |
| 1496 | $interface = false, $language = null |
| 1497 | ) { |
| 1498 | global $wgTitle; |
| 1499 | |
| 1500 | if ( $this->inParser ) { |
| 1501 | return htmlspecialchars( $text ); |
| 1502 | } |
| 1503 | |
| 1504 | $parser = $this->getParser(); |
| 1505 | $popts = $this->getParserOptions(); |
| 1506 | $popts->setInterfaceMessage( $interface ); |
| 1507 | |
| 1508 | if ( is_string( $language ) ) { |
| 1509 | $language = $this->langFactory->getLanguage( $language ); |
| 1510 | } |
| 1511 | $popts->setTargetLanguage( $language ); |
| 1512 | |
| 1513 | if ( !$page ) { |
| 1514 | $logger = LoggerFactory::getInstance( 'GlobalTitleFail' ); |
| 1515 | $logger->info( |
| 1516 | __METHOD__ . ' called with no title set.', |
| 1517 | [ 'exception' => new RuntimeException ] |
| 1518 | ); |
| 1519 | $page = $wgTitle; |
| 1520 | } |
| 1521 | // Sometimes $wgTitle isn't set either... |
| 1522 | if ( !$page ) { |
| 1523 | // It's not uncommon having a null $wgTitle in scripts. See r80898 |
| 1524 | // Create a ghost title in such case |
| 1525 | $page = PageReferenceValue::localReference( |
| 1526 | NS_SPECIAL, |
| 1527 | 'Badtitle/title not set in ' . __METHOD__ |
| 1528 | ); |
| 1529 | } |
| 1530 | |
| 1531 | $this->inParser = true; |
| 1532 | $res = $parser->parse( $text, $page, $popts, $linestart ); |
| 1533 | $this->inParser = false; |
| 1534 | |
| 1535 | return $res; |
| 1536 | } |
| 1537 | |
| 1538 | public function disable() { |
| 1539 | $this->disable = true; |
| 1540 | } |
| 1541 | |
| 1542 | public function enable() { |
| 1543 | $this->disable = false; |
| 1544 | } |
| 1545 | |
| 1546 | /** |
| 1547 | * Whether DB/cache usage is disabled for determining messages |
| 1548 | * |
| 1549 | * If so, this typically indicates either: |
| 1550 | * - a) load() failed to find a cached copy nor query the DB |
| 1551 | * - b) we are in a special context or error mode that cannot use the DB |
| 1552 | * If the DB is ignored, any derived HTML output or cached objects may be wrong. |
| 1553 | * To avoid long-term cache pollution, TTLs can be adjusted accordingly. |
| 1554 | * |
| 1555 | * @return bool |
| 1556 | * @since 1.27 |
| 1557 | */ |
| 1558 | public function isDisabled() { |
| 1559 | return $this->disable; |
| 1560 | } |
| 1561 | |
| 1562 | /** |
| 1563 | * Clear all stored messages in global and local cache |
| 1564 | * |
| 1565 | * Mainly used after a mass rebuild |
| 1566 | */ |
| 1567 | public function clear() { |
| 1568 | $langs = $this->languageNameUtils->getLanguageNames(); |
| 1569 | foreach ( $langs as $code => $_ ) { |
| 1570 | $this->wanCache->touchCheckKey( $this->getCheckKey( $code ) ); |
| 1571 | } |
| 1572 | $this->cache->clear(); |
| 1573 | } |
| 1574 | |
| 1575 | /** |
| 1576 | * @param string $key |
| 1577 | * @return array |
| 1578 | */ |
| 1579 | public function figureMessage( $key ) { |
| 1580 | $pieces = explode( '/', $key ); |
| 1581 | if ( count( $pieces ) < 2 ) { |
| 1582 | return [ $key, $this->contLangCode ]; |
| 1583 | } |
| 1584 | |
| 1585 | $lang = array_pop( $pieces ); |
| 1586 | if ( !$this->languageNameUtils->getLanguageName( |
| 1587 | $lang, |
| 1588 | LanguageNameUtils::AUTONYMS, |
| 1589 | LanguageNameUtils::DEFINED |
| 1590 | ) ) { |
| 1591 | return [ $key, $this->contLangCode ]; |
| 1592 | } |
| 1593 | |
| 1594 | $message = implode( '/', $pieces ); |
| 1595 | |
| 1596 | return [ $message, $lang ]; |
| 1597 | } |
| 1598 | |
| 1599 | /** |
| 1600 | * Get all message keys stored in the message cache for a given language. |
| 1601 | * If $code is the content language code, this will return all message keys |
| 1602 | * for which MediaWiki:msgkey exists. If $code is another language code, this |
| 1603 | * will ONLY return message keys for which MediaWiki:msgkey/$code exists. |
| 1604 | * |
| 1605 | * @param string $code Language code |
| 1606 | * @return string[]|null Array of message keys |
| 1607 | */ |
| 1608 | public function getAllMessageKeys( $code ) { |
| 1609 | $this->load( $code ); |
| 1610 | if ( !$this->cache->has( $code ) ) { |
| 1611 | // Apparently load() failed |
| 1612 | return null; |
| 1613 | } |
| 1614 | // Remove administrative keys |
| 1615 | $cache = $this->cache->get( $code ); |
| 1616 | unset( $cache['VERSION'] ); |
| 1617 | unset( $cache['EXPIRY'] ); |
| 1618 | unset( $cache['EXCESSIVE'] ); |
| 1619 | // Remove any !NONEXISTENT keys |
| 1620 | $cache = array_diff( $cache, [ '!NONEXISTENT' ] ); |
| 1621 | |
| 1622 | // Keys may appear with a capital first letter. lcfirst them. |
| 1623 | return array_map( [ $this->contLang, 'lcfirst' ], array_keys( $cache ) ); |
| 1624 | } |
| 1625 | |
| 1626 | /** |
| 1627 | * Purge message caches when a MediaWiki: page is created, updated, or deleted |
| 1628 | * |
| 1629 | * @param LinkTarget $linkTarget Message page title |
| 1630 | * @param Content|null $content New content for edit/create, null on deletion |
| 1631 | * @since 1.29 |
| 1632 | */ |
| 1633 | public function updateMessageOverride( LinkTarget $linkTarget, Content $content = null ) { |
| 1634 | // treat null as not existing |
| 1635 | $msgText = $this->getMessageTextFromContent( $content ) ?? false; |
| 1636 | |
| 1637 | $this->replace( $linkTarget->getDBkey(), $msgText ); |
| 1638 | |
| 1639 | if ( $this->contLangConverter->hasVariants() ) { |
| 1640 | $this->contLangConverter->updateConversionTable( $linkTarget ); |
| 1641 | } |
| 1642 | } |
| 1643 | |
| 1644 | /** |
| 1645 | * @param string $code Language code |
| 1646 | * @return string WAN cache key usable as a "check key" against language page edits |
| 1647 | */ |
| 1648 | public function getCheckKey( $code ) { |
| 1649 | return $this->wanCache->makeKey( 'messages', $code ); |
| 1650 | } |
| 1651 | |
| 1652 | /** |
| 1653 | * @param Content|null $content Content or null if the message page does not exist |
| 1654 | * @return string|false|null Returns false if $content is null and null on error |
| 1655 | */ |
| 1656 | private function getMessageTextFromContent( Content $content = null ) { |
| 1657 | // @TODO: could skip pseudo-messages like js/css here, based on content model |
| 1658 | if ( $content ) { |
| 1659 | // Message page exists... |
| 1660 | // XXX: Is this the right way to turn a Content object into a message? |
| 1661 | // NOTE: $content is typically either WikitextContent, JavaScriptContent or |
| 1662 | // CssContent. MessageContent is *not* used for storing messages, it's |
| 1663 | // only used for wrapping them when needed. |
| 1664 | $msgText = $content->getWikitextForTransclusion(); |
| 1665 | if ( $msgText === false || $msgText === null ) { |
| 1666 | // This might be due to some kind of misconfiguration... |
| 1667 | $msgText = null; |
| 1668 | $this->logger->warning( |
| 1669 | __METHOD__ . ": message content doesn't provide wikitext " |
| 1670 | . "(content model: " . $content->getModel() . ")" ); |
| 1671 | } |
| 1672 | } else { |
| 1673 | // Message page does not exist... |
| 1674 | $msgText = false; |
| 1675 | } |
| 1676 | |
| 1677 | return $msgText; |
| 1678 | } |
| 1679 | |
| 1680 | /** |
| 1681 | * @param string $hash Hash for this version of the entire key/value overrides map |
| 1682 | * @param string $title Message cache key with the initial uppercase letter |
| 1683 | * @return string |
| 1684 | */ |
| 1685 | private function bigMessageCacheKey( $hash, $title ) { |
| 1686 | return $this->wanCache->makeKey( 'messages-big', $hash, $title ); |
| 1687 | } |
| 1688 | } |