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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\Deferred\DeferredUpdates; |
| 23 | use MediaWiki\Logger\Spi; |
| 24 | use MediaWiki\MainConfigNames; |
| 25 | use MediaWiki\MediaWikiServices; |
| 26 | use Wikimedia\ObjectCache\APCUBagOStuff; |
| 27 | use Wikimedia\ObjectCache\BagOStuff; |
| 28 | use Wikimedia\ObjectCache\EmptyBagOStuff; |
| 29 | use Wikimedia\ObjectCache\HashBagOStuff; |
| 30 | use Wikimedia\ObjectCache\MemcachedBagOStuff; |
| 31 | use Wikimedia\ObjectCache\MultiWriteBagOStuff; |
| 32 | use Wikimedia\Stats\StatsFactory; |
| 33 | use Wikimedia\Telemetry\TracerInterface; |
| 34 | |
| 35 | /** |
| 36 | * Factory for cache objects as configured in the ObjectCaches setting. |
| 37 | * |
| 38 | * The word "cache" has two main dictionary meanings, and both |
| 39 | * are used in this factory class. They are: |
| 40 | * |
| 41 | * - a) Cache (the computer science definition). |
| 42 | * A place to store copies or computations on existing data for |
| 43 | * higher access speeds. |
| 44 | * - b) Storage. |
| 45 | * A place to store lightweight data that is not canonically |
| 46 | * stored anywhere else (e.g. a "hoard" of objects). |
| 47 | * |
| 48 | * Primary entry points: |
| 49 | * |
| 50 | * - ObjectCacheFactory::getLocalServerInstance( $fallbackType ) |
| 51 | * Purpose: Memory cache for very hot keys. |
| 52 | * Stored only on the individual web server (typically APC or APCu for web requests, |
| 53 | * and EmptyBagOStuff in CLI mode). |
| 54 | * Not replicated to the other servers. |
| 55 | * |
| 56 | * - ObjectCacheFactory::getLocalClusterInstance() |
| 57 | * Purpose: Memory storage for per-cluster coordination and tracking. |
| 58 | * A typical use case would be a rate limit counter or cache regeneration mutex. |
| 59 | * Stored centrally within the local data-center. Not replicated to other DCs. |
| 60 | * Configured by $wgMainCacheType. |
| 61 | * |
| 62 | * - ObjectCacheFactory::getInstance( $cacheType ) |
| 63 | * Purpose: Special cases (like tiered memory/disk caches). |
| 64 | * Get a specific cache type by key in $wgObjectCaches. |
| 65 | * |
| 66 | * All the above BagOStuff cache instances have their makeKey() |
| 67 | * method scoped to the *current* wiki ID. Use makeGlobalKey() to avoid this scoping |
| 68 | * when using keys that need to be shared amongst wikis. |
| 69 | * |
| 70 | * @ingroup Cache |
| 71 | * @since 1.42 |
| 72 | */ |
| 73 | class ObjectCacheFactory { |
| 74 | /** |
| 75 | * @internal For use by ServiceWiring.php |
| 76 | */ |
| 77 | public const CONSTRUCTOR_OPTIONS = [ |
| 78 | MainConfigNames::SQLiteDataDir, |
| 79 | MainConfigNames::UpdateRowsPerQuery, |
| 80 | MainConfigNames::MemCachedServers, |
| 81 | MainConfigNames::MemCachedPersistent, |
| 82 | MainConfigNames::MemCachedTimeout, |
| 83 | MainConfigNames::CachePrefix, |
| 84 | MainConfigNames::ObjectCaches, |
| 85 | MainConfigNames::MainCacheType, |
| 86 | MainConfigNames::MessageCacheType, |
| 87 | MainConfigNames::ParserCacheType, |
| 88 | ]; |
| 89 | |
| 90 | private ServiceOptions $options; |
| 91 | private StatsFactory $stats; |
| 92 | private Spi $logger; |
| 93 | private TracerInterface $telemetry; |
| 94 | /** @var BagOStuff[] */ |
| 95 | private $instances = []; |
| 96 | private string $domainId; |
| 97 | /** @var callable */ |
| 98 | private $dbLoadBalancerFactory; |
| 99 | /** |
| 100 | * @internal ObjectCacheFactoryTest only |
| 101 | * @var string |
| 102 | */ |
| 103 | public static $localServerCacheClass; |
| 104 | |
| 105 | public function __construct( |
| 106 | ServiceOptions $options, |
| 107 | StatsFactory $stats, |
| 108 | Spi $loggerSpi, |
| 109 | callable $dbLoadBalancerFactory, |
| 110 | string $domainId, |
| 111 | TracerInterface $telemetry |
| 112 | ) { |
| 113 | $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS ); |
| 114 | $this->options = $options; |
| 115 | $this->stats = $stats; |
| 116 | $this->logger = $loggerSpi; |
| 117 | $this->dbLoadBalancerFactory = $dbLoadBalancerFactory; |
| 118 | $this->domainId = $domainId; |
| 119 | $this->telemetry = $telemetry; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Get the default keyspace for this wiki. |
| 124 | * |
| 125 | * This is either the value of the MainConfigNames::CachePrefix setting |
| 126 | * or (if the former is unset) the MainConfigNames::DBname setting, with |
| 127 | * MainConfigNames::DBprefix (if defined). |
| 128 | */ |
| 129 | private function getDefaultKeyspace(): string { |
| 130 | $cachePrefix = $this->options->get( MainConfigNames::CachePrefix ); |
| 131 | if ( is_string( $cachePrefix ) && $cachePrefix !== '' ) { |
| 132 | return $cachePrefix; |
| 133 | } |
| 134 | |
| 135 | return $this->domainId; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Create a new cache object of the specified type. |
| 140 | * |
| 141 | * @param string|int $id A key in $wgObjectCaches. |
| 142 | * @return BagOStuff |
| 143 | */ |
| 144 | private function newFromId( $id ): BagOStuff { |
| 145 | if ( $id === CACHE_ANYTHING ) { |
| 146 | $id = $this->getAnythingId(); |
| 147 | } |
| 148 | |
| 149 | if ( !isset( $this->options->get( MainConfigNames::ObjectCaches )[$id] ) ) { |
| 150 | // Always recognize these |
| 151 | if ( $id === CACHE_NONE ) { |
| 152 | return new EmptyBagOStuff(); |
| 153 | } elseif ( $id === CACHE_HASH ) { |
| 154 | return new HashBagOStuff(); |
| 155 | } elseif ( $id === CACHE_ACCEL ) { |
| 156 | return self::makeLocalServerCache( $this->getDefaultKeyspace() ); |
| 157 | } elseif ( $id === 'wincache' ) { |
| 158 | wfDeprecated( __METHOD__ . ' with cache ID "wincache"', '1.43' ); |
| 159 | return self::makeLocalServerCache( $this->getDefaultKeyspace() ); |
| 160 | } |
| 161 | |
| 162 | throw new InvalidArgumentException( "Invalid object cache type \"$id\" requested. " . |
| 163 | "It is not present in \$wgObjectCaches." ); |
| 164 | } |
| 165 | |
| 166 | return $this->newFromParams( $this->options->get( MainConfigNames::ObjectCaches )[$id] ); |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Get a cached instance of the specified type of cache object. |
| 171 | * |
| 172 | * @param string|int $id A key in $wgObjectCaches. |
| 173 | * @return BagOStuff |
| 174 | */ |
| 175 | public function getInstance( $id ): BagOStuff { |
| 176 | if ( !isset( $this->instances[$id] ) ) { |
| 177 | $this->instances[$id] = $this->newFromId( $id ); |
| 178 | } |
| 179 | |
| 180 | return $this->instances[$id]; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Create a new cache object from parameters specification supplied. |
| 185 | * |
| 186 | * @internal Using this method directly outside of MediaWiki core |
| 187 | * is discouraged. Use getInstance() instead and supply the ID |
| 188 | * of the cache instance to be looked up. |
| 189 | * |
| 190 | * @param array $params Must have 'factory' or 'class' property. |
| 191 | * - factory: Callback passed $params that returns BagOStuff. |
| 192 | * - class: BagOStuff subclass constructed with $params. |
| 193 | * - loggroup: Alias to set 'logger' key with LoggerFactory group. |
| 194 | * - .. Other parameters passed to factory or class. |
| 195 | * |
| 196 | * @return BagOStuff |
| 197 | */ |
| 198 | public function newFromParams( array $params ): BagOStuff { |
| 199 | $logger = $this->logger->getLogger( $params['loggroup'] ?? 'objectcache' ); |
| 200 | // Apply default parameters and resolve the logger instance |
| 201 | $params += [ |
| 202 | 'logger' => $logger, |
| 203 | 'keyspace' => $this->getDefaultKeyspace(), |
| 204 | 'asyncHandler' => [ DeferredUpdates::class, 'addCallableUpdate' ], |
| 205 | 'reportDupes' => true, |
| 206 | 'stats' => $this->stats, |
| 207 | 'telemetry' => $this->telemetry, |
| 208 | ]; |
| 209 | |
| 210 | if ( isset( $params['factory'] ) ) { |
| 211 | $args = $params['args'] ?? [ $params ]; |
| 212 | |
| 213 | return $params['factory']( ...$args ); |
| 214 | } |
| 215 | |
| 216 | if ( !isset( $params['class'] ) ) { |
| 217 | throw new InvalidArgumentException( |
| 218 | 'No "factory" nor "class" provided; got "' . print_r( $params, true ) . '"' |
| 219 | ); |
| 220 | } |
| 221 | |
| 222 | $class = $params['class']; |
| 223 | |
| 224 | // Normalization and DI for SqlBagOStuff |
| 225 | if ( is_a( $class, SqlBagOStuff::class, true ) ) { |
| 226 | $this->prepareSqlBagOStuffFromParams( $params ); |
| 227 | } |
| 228 | |
| 229 | // Normalization and DI for MemcachedBagOStuff |
| 230 | if ( is_subclass_of( $class, MemcachedBagOStuff::class ) ) { |
| 231 | $this->prepareMemcachedBagOStuffFromParams( $params ); |
| 232 | } |
| 233 | |
| 234 | // Normalization and DI for MultiWriteBagOStuff |
| 235 | if ( is_a( $class, MultiWriteBagOStuff::class, true ) ) { |
| 236 | $this->prepareMultiWriteBagOStuffFromParams( $params ); |
| 237 | } |
| 238 | |
| 239 | return new $class( $params ); |
| 240 | } |
| 241 | |
| 242 | private function prepareSqlBagOStuffFromParams( array &$params ): void { |
| 243 | if ( isset( $params['globalKeyLB'] ) ) { |
| 244 | throw new InvalidArgumentException( |
| 245 | 'globalKeyLB in $wgObjectCaches is no longer supported' ); |
| 246 | } |
| 247 | if ( isset( $params['server'] ) && !isset( $params['servers'] ) ) { |
| 248 | $params['servers'] = [ $params['server'] ]; |
| 249 | unset( $params['server'] ); |
| 250 | } |
| 251 | if ( isset( $params['servers'] ) ) { |
| 252 | // In the past it was not required to set 'dbDirectory' in $wgObjectCaches |
| 253 | foreach ( $params['servers'] as &$server ) { |
| 254 | if ( $server['type'] === 'sqlite' && !isset( $server['dbDirectory'] ) ) { |
| 255 | $server['dbDirectory'] = $this->options->get( MainConfigNames::SQLiteDataDir ); |
| 256 | } |
| 257 | } |
| 258 | } elseif ( isset( $params['cluster'] ) ) { |
| 259 | $cluster = $params['cluster']; |
| 260 | $dbLbFactory = $this->dbLoadBalancerFactory; |
| 261 | $params['loadBalancerCallback'] = static function () use ( $cluster, $dbLbFactory ) { |
| 262 | return $dbLbFactory()->getExternalLB( $cluster ); |
| 263 | }; |
| 264 | $params += [ 'dbDomain' => false ]; |
| 265 | } else { |
| 266 | $dbLbFactory = $this->dbLoadBalancerFactory; |
| 267 | $params['loadBalancerCallback'] = static function () use ( $dbLbFactory ) { |
| 268 | return $dbLbFactory()->getMainLb(); |
| 269 | }; |
| 270 | $params += [ 'dbDomain' => false ]; |
| 271 | } |
| 272 | $params += [ 'writeBatchSize' => $this->options->get( MainConfigNames::UpdateRowsPerQuery ) ]; |
| 273 | } |
| 274 | |
| 275 | private function prepareMemcachedBagOStuffFromParams( array &$params ): void { |
| 276 | $params += [ |
| 277 | 'servers' => $this->options->get( MainConfigNames::MemCachedServers ), |
| 278 | 'persistent' => $this->options->get( MainConfigNames::MemCachedPersistent ), |
| 279 | 'timeout' => $this->options->get( MainConfigNames::MemCachedTimeout ), |
| 280 | ]; |
| 281 | } |
| 282 | |
| 283 | private function prepareMultiWriteBagOStuffFromParams( array &$params ): void { |
| 284 | // Phan warns about foreach with non-array because it |
| 285 | // thinks any key can be Closure|IBufferingStatsdDataFactory |
| 286 | '@phan-var array{caches:array[]} $params'; |
| 287 | foreach ( $params['caches'] ?? [] as $i => $cacheInfo ) { |
| 288 | // Ensure logger, keyspace, asyncHandler, etc are injected just as if |
| 289 | // one of these was configured without MultiWriteBagOStuff (T318272) |
| 290 | $params['caches'][$i] = $this->newFromParams( $cacheInfo ); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | /** |
| 295 | * Factory function for CACHE_ACCEL (referenced from configuration) |
| 296 | * |
| 297 | * This will look for any APC or APCu style server-local cache. |
| 298 | * A fallback cache can be specified if none is found. |
| 299 | * |
| 300 | * // Direct calls |
| 301 | * ObjectCache::getLocalServerInstance( $fallbackType ); |
| 302 | * |
| 303 | * // From $wgObjectCaches via newFromParams() |
| 304 | * ObjectCache::getLocalServerInstance( [ 'fallback' => $fallbackType ] ); |
| 305 | * |
| 306 | * @param int|string|array $fallback Fallback cache or parameter map with 'fallback' |
| 307 | * @return BagOStuff |
| 308 | * @throws InvalidArgumentException |
| 309 | */ |
| 310 | public function getLocalServerInstance( $fallback = CACHE_NONE ): BagOStuff { |
| 311 | $cache = $this->getInstance( CACHE_ACCEL ); |
| 312 | if ( $cache instanceof EmptyBagOStuff ) { |
| 313 | if ( is_array( $fallback ) ) { |
| 314 | $fallback = $fallback['fallback'] ?? CACHE_NONE; |
| 315 | } |
| 316 | $cache = $this->getInstance( $fallback ); |
| 317 | } |
| 318 | |
| 319 | return $cache; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Clear all the cached instances. |
| 324 | */ |
| 325 | public function clear(): void { |
| 326 | $this->instances = []; |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * Get the class which will be used for the local server cache |
| 331 | * @return string |
| 332 | */ |
| 333 | private static function getLocalServerCacheClass() { |
| 334 | if ( self::$localServerCacheClass !== null ) { |
| 335 | return self::$localServerCacheClass; |
| 336 | } |
| 337 | if ( function_exists( 'apcu_fetch' ) ) { |
| 338 | // Make sure the APCu methods actually store anything |
| 339 | if ( PHP_SAPI !== 'cli' || ini_get( 'apc.enable_cli' ) ) { |
| 340 | return APCUBagOStuff::class; |
| 341 | |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | return EmptyBagOStuff::class; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Get the ID that will be used for CACHE_ANYTHING |
| 350 | * |
| 351 | * @internal |
| 352 | * @return string|int |
| 353 | */ |
| 354 | public function getAnythingId() { |
| 355 | $candidates = [ |
| 356 | $this->options->get( MainConfigNames::MainCacheType ), |
| 357 | $this->options->get( MainConfigNames::MessageCacheType ), |
| 358 | $this->options->get( MainConfigNames::ParserCacheType ) |
| 359 | ]; |
| 360 | foreach ( $candidates as $candidate ) { |
| 361 | if ( $candidate === CACHE_ACCEL ) { |
| 362 | // CACHE_ACCEL might default to nothing if no APCu |
| 363 | // See includes/ServiceWiring.php |
| 364 | $class = self::getLocalServerCacheClass(); |
| 365 | if ( $class !== EmptyBagOStuff::class ) { |
| 366 | return $candidate; |
| 367 | } |
| 368 | } elseif ( $candidate !== CACHE_NONE && $candidate !== CACHE_ANYTHING ) { |
| 369 | return $candidate; |
| 370 | } |
| 371 | } |
| 372 | |
| 373 | $services = MediaWikiServices::getInstance(); |
| 374 | |
| 375 | if ( $services->isServiceDisabled( 'DBLoadBalancer' ) ) { |
| 376 | // The DBLoadBalancer service is disabled, so we can't use the database! |
| 377 | $candidate = CACHE_NONE; |
| 378 | } elseif ( $services->isStorageDisabled() ) { |
| 379 | // Storage services are disabled because MediaWikiServices::disableStorage() |
| 380 | // was called. This is typically the case during installation. |
| 381 | $candidate = CACHE_NONE; |
| 382 | } else { |
| 383 | $candidate = CACHE_DB; |
| 384 | } |
| 385 | return $candidate; |
| 386 | } |
| 387 | |
| 388 | /** |
| 389 | * Create a new BagOStuff instance for local-server caching. |
| 390 | * |
| 391 | * Only use this if you explicitly require the creation of |
| 392 | * a fresh instance. Whenever possible, use or inject the object |
| 393 | * from MediaWikiServices::getLocalServerObjectCache() instead. |
| 394 | * |
| 395 | * NOTE: This method is called very early via Setup.php by ExtensionRegistry, |
| 396 | * and thus must remain fairly standalone so as to not cause initialization |
| 397 | * of the MediaWikiServices singleton. |
| 398 | * |
| 399 | * @internal For use by ServiceWiring and ExtensionRegistry. There are use |
| 400 | * cases whereby we want to build up local server cache without service |
| 401 | * wiring available. |
| 402 | * @since 1.43, previously on ObjectCache.php since 1.35 |
| 403 | * |
| 404 | * @param string $keyspace |
| 405 | * @return BagOStuff |
| 406 | */ |
| 407 | public static function makeLocalServerCache( string $keyspace ) { |
| 408 | $params = [ |
| 409 | 'reportDupes' => false, |
| 410 | // Even simple caches must use a keyspace (T247562) |
| 411 | 'keyspace' => $keyspace, |
| 412 | ]; |
| 413 | $class = self::getLocalServerCacheClass(); |
| 414 | return new $class( $params ); |
| 415 | } |
| 416 | |
| 417 | /** |
| 418 | * Determine whether a config ID would access the database |
| 419 | * |
| 420 | * @internal For use by ServiceWiring.php |
| 421 | * @param string|int $id A key in $wgObjectCaches |
| 422 | * @return bool |
| 423 | */ |
| 424 | public function isDatabaseId( $id ) { |
| 425 | // NOTE: Sanity check if $id is set to CACHE_ANYTHING and |
| 426 | // everything is going through service wiring. CACHE_ANYTHING |
| 427 | // would default to CACHE_DB, let's handle that early for cases |
| 428 | // where all cache configs are set to CACHE_ANYTHING (T362686). |
| 429 | if ( $id === CACHE_ANYTHING ) { |
| 430 | $id = $this->getAnythingId(); |
| 431 | return $this->isDatabaseId( $id ); |
| 432 | } |
| 433 | |
| 434 | if ( !isset( $this->options->get( MainConfigNames::ObjectCaches )[$id] ) ) { |
| 435 | return false; |
| 436 | } |
| 437 | $cache = $this->options->get( MainConfigNames::ObjectCaches )[$id]; |
| 438 | if ( ( $cache['class'] ?? '' ) === SqlBagOStuff::class ) { |
| 439 | return true; |
| 440 | } |
| 441 | |
| 442 | return false; |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * Get the main cluster-local cache object. |
| 447 | * |
| 448 | * @since 1.43, previously on ObjectCache.php since 1.27 |
| 449 | * @return BagOStuff |
| 450 | */ |
| 451 | public function getLocalClusterInstance() { |
| 452 | return $this->getInstance( |
| 453 | $this->options->get( MainConfigNames::MainCacheType ) |
| 454 | ); |
| 455 | } |
| 456 | } |