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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\Http\Telemetry; |
| 23 | use MediaWiki\Logger\Spi; |
| 24 | use MediaWiki\MainConfigNames; |
| 25 | use Wikimedia\Stats\StatsFactory; |
| 26 | |
| 27 | /** |
| 28 | * Factory for cache objects as configured in the ObjectCaches setting. |
| 29 | * |
| 30 | * The word "cache" has two main dictionary meanings, and both |
| 31 | * are used in this factory class. They are: |
| 32 | * |
| 33 | * - a) Cache (the computer science definition). |
| 34 | * A place to store copies or computations on existing data for |
| 35 | * higher access speeds. |
| 36 | * - b) Storage. |
| 37 | * A place to store lightweight data that is not canonically |
| 38 | * stored anywhere else (e.g. a "hoard" of objects). |
| 39 | * |
| 40 | * Primary entry points: |
| 41 | * |
| 42 | * - ObjectCacheFactory::getLocalServerInstance( $fallbackType ) |
| 43 | * Purpose: Memory cache for very hot keys. |
| 44 | * Stored only on the individual web server (typically APC or APCu for web requests, |
| 45 | * and EmptyBagOStuff in CLI mode). |
| 46 | * Not replicated to the other servers. |
| 47 | * |
| 48 | * - ObjectCacheFactory::getInstance( $cacheType ) |
| 49 | * Purpose: Special cases (like tiered memory/disk caches). |
| 50 | * Get a specific cache type by key in $wgObjectCaches. |
| 51 | * |
| 52 | * All the above BagOStuff cache instances have their makeKey() |
| 53 | * method scoped to the *current* wiki ID. Use makeGlobalKey() to avoid this scoping |
| 54 | * when using keys that need to be shared amongst wikis. |
| 55 | * |
| 56 | * @ingroup Cache |
| 57 | * @since 1.42 |
| 58 | */ |
| 59 | class ObjectCacheFactory { |
| 60 | /** |
| 61 | * @internal For use by ServiceWiring.php |
| 62 | * @var array |
| 63 | */ |
| 64 | public const CONSTRUCTOR_OPTIONS = [ |
| 65 | MainConfigNames::SQLiteDataDir, |
| 66 | MainConfigNames::UpdateRowsPerQuery, |
| 67 | MainConfigNames::MemCachedServers, |
| 68 | MainConfigNames::MemCachedPersistent, |
| 69 | MainConfigNames::MemCachedTimeout, |
| 70 | MainConfigNames::CachePrefix, |
| 71 | MainConfigNames::ObjectCaches, |
| 72 | MainConfigNames::MainCacheType, |
| 73 | ]; |
| 74 | |
| 75 | private ServiceOptions $options; |
| 76 | private StatsFactory $stats; |
| 77 | private Spi $logger; |
| 78 | /** @var BagOStuff[] */ |
| 79 | private $instances = []; |
| 80 | private string $domainId; |
| 81 | /** @var callable */ |
| 82 | private $dbLoadBalancerFactory; |
| 83 | |
| 84 | public function __construct( |
| 85 | ServiceOptions $options, |
| 86 | StatsFactory $stats, |
| 87 | Spi $loggerSpi, |
| 88 | callable $dbLoadBalancerFactory, |
| 89 | string $domainId |
| 90 | ) { |
| 91 | $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS ); |
| 92 | $this->options = $options; |
| 93 | $this->stats = $stats; |
| 94 | $this->logger = $loggerSpi; |
| 95 | $this->dbLoadBalancerFactory = $dbLoadBalancerFactory; |
| 96 | $this->domainId = $domainId; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Get the default keyspace for this wiki. |
| 101 | * |
| 102 | * This is either the value of the MainConfigNames::CachePrefix setting |
| 103 | * or (if the former is unset) the MainConfigNames::DBname setting, with |
| 104 | * MainConfigNames::DBprefix (if defined). |
| 105 | * |
| 106 | * @return string |
| 107 | */ |
| 108 | private function getDefaultKeyspace(): string { |
| 109 | $cachePrefix = $this->options->get( MainConfigNames::CachePrefix ); |
| 110 | if ( is_string( $cachePrefix ) && $cachePrefix !== '' ) { |
| 111 | return $cachePrefix; |
| 112 | } |
| 113 | |
| 114 | return $this->domainId; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Create a new cache object of the specified type. |
| 119 | * |
| 120 | * @param string|int $id A key in $wgObjectCaches. |
| 121 | * @return BagOStuff |
| 122 | */ |
| 123 | private function newFromId( $id ): BagOStuff { |
| 124 | if ( $id === CACHE_ANYTHING ) { |
| 125 | $id = ObjectCache::getAnythingId(); |
| 126 | } |
| 127 | |
| 128 | if ( !isset( $this->options->get( MainConfigNames::ObjectCaches )[$id] ) ) { |
| 129 | // Always recognize these |
| 130 | if ( $id === CACHE_NONE ) { |
| 131 | return new EmptyBagOStuff(); |
| 132 | } elseif ( $id === CACHE_HASH ) { |
| 133 | return new HashBagOStuff(); |
| 134 | } elseif ( $id === CACHE_ACCEL ) { |
| 135 | return ObjectCache::makeLocalServerCache( $this->getDefaultKeyspace() ); |
| 136 | } |
| 137 | |
| 138 | throw new InvalidArgumentException( "Invalid object cache type \"$id\" requested. " . |
| 139 | "It is not present in \$wgObjectCaches." ); |
| 140 | } |
| 141 | |
| 142 | return $this->newFromParams( $this->options->get( MainConfigNames::ObjectCaches )[$id] ); |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Get a cached instance of the specified type of cache object. |
| 147 | * |
| 148 | * @param string|int $id A key in $wgObjectCaches. |
| 149 | * @return BagOStuff |
| 150 | */ |
| 151 | public function getInstance( $id ): BagOStuff { |
| 152 | if ( !isset( $this->instances[$id] ) ) { |
| 153 | $this->instances[$id] = $this->newFromId( $id ); |
| 154 | } |
| 155 | |
| 156 | return $this->instances[$id]; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * @internal Using this method directly outside of MediaWiki core |
| 161 | * is discouraged. Use getInstance() instead and supply the ID |
| 162 | * of the cache instance to be looked up. |
| 163 | * |
| 164 | * Create a new cache object from parameters specification supplied. |
| 165 | * |
| 166 | * @param array $params Must have 'factory' or 'class' property. |
| 167 | * - factory: Callback passed $params that returns BagOStuff. |
| 168 | * - class: BagOStuff subclass constructed with $params. |
| 169 | * - loggroup: Alias to set 'logger' key with LoggerFactory group. |
| 170 | * - .. Other parameters passed to factory or class. |
| 171 | * |
| 172 | * @return BagOStuff |
| 173 | */ |
| 174 | public function newFromParams( array $params ): BagOStuff { |
| 175 | $logger = $this->logger->getLogger( $params['loggroup'] ?? 'objectcache' ); |
| 176 | // Apply default parameters and resolve the logger instance |
| 177 | $params += [ |
| 178 | 'logger' => $logger, |
| 179 | 'keyspace' => $this->getDefaultKeyspace(), |
| 180 | 'asyncHandler' => [ DeferredUpdates::class, 'addCallableUpdate' ], |
| 181 | 'reportDupes' => true, |
| 182 | 'stats' => $this->stats, |
| 183 | ]; |
| 184 | |
| 185 | if ( isset( $params['factory'] ) ) { |
| 186 | $args = $params['args'] ?? [ $params ]; |
| 187 | |
| 188 | return call_user_func( $params['factory'], ...$args ); |
| 189 | } |
| 190 | |
| 191 | if ( !isset( $params['class'] ) ) { |
| 192 | throw new InvalidArgumentException( |
| 193 | 'No "factory" nor "class" provided; got "' . print_r( $params, true ) . '"' |
| 194 | ); |
| 195 | } |
| 196 | |
| 197 | $class = $params['class']; |
| 198 | |
| 199 | // Normalization and DI for SqlBagOStuff |
| 200 | if ( is_a( $class, SqlBagOStuff::class, true ) ) { |
| 201 | $this->prepareSqlBagOStuffFromParams( $params ); |
| 202 | } |
| 203 | |
| 204 | // Normalization and DI for MemcachedBagOStuff |
| 205 | if ( is_subclass_of( $class, MemcachedBagOStuff::class ) ) { |
| 206 | $this->prepareMemcachedBagOStuffFromParams( $params ); |
| 207 | } |
| 208 | |
| 209 | // Normalization and DI for MultiWriteBagOStuff |
| 210 | if ( is_a( $class, MultiWriteBagOStuff::class, true ) ) { |
| 211 | $this->prepareMultiWriteBagOStuffFromParams( $params ); |
| 212 | } |
| 213 | if ( is_a( $class, RESTBagOStuff::class, true ) ) { |
| 214 | $this->prepareRESTBagOStuffFromParams( $params ); |
| 215 | } |
| 216 | |
| 217 | return new $class( $params ); |
| 218 | } |
| 219 | |
| 220 | private function prepareSqlBagOStuffFromParams( array &$params ): void { |
| 221 | if ( isset( $params['globalKeyLB'] ) ) { |
| 222 | throw new InvalidArgumentException( |
| 223 | 'globalKeyLB in $wgObjectCaches is no longer supported' ); |
| 224 | } |
| 225 | if ( isset( $params['server'] ) && !isset( $params['servers'] ) ) { |
| 226 | $params['servers'] = [ $params['server'] ]; |
| 227 | unset( $params['server'] ); |
| 228 | } |
| 229 | if ( isset( $params['servers'] ) ) { |
| 230 | // In the past it was not required to set 'dbDirectory' in $wgObjectCaches |
| 231 | foreach ( $params['servers'] as &$server ) { |
| 232 | if ( $server['type'] === 'sqlite' && !isset( $server['dbDirectory'] ) ) { |
| 233 | $server['dbDirectory'] = $this->options->get( MainConfigNames::SQLiteDataDir ); |
| 234 | } |
| 235 | } |
| 236 | } elseif ( isset( $params['cluster'] ) ) { |
| 237 | $cluster = $params['cluster']; |
| 238 | $dbLbFactory = $this->dbLoadBalancerFactory; |
| 239 | $params['loadBalancerCallback'] = static function () use ( $cluster, $dbLbFactory ) { |
| 240 | return $dbLbFactory()->getExternalLB( $cluster ); |
| 241 | }; |
| 242 | $params += [ 'dbDomain' => false ]; |
| 243 | } else { |
| 244 | $dbLbFactory = $this->dbLoadBalancerFactory; |
| 245 | $params['loadBalancerCallback'] = static function () use ( $dbLbFactory ) { |
| 246 | return $dbLbFactory()->getMainLb(); |
| 247 | }; |
| 248 | $params += [ 'dbDomain' => false ]; |
| 249 | } |
| 250 | $params += [ 'writeBatchSize' => $this->options->get( MainConfigNames::UpdateRowsPerQuery ) ]; |
| 251 | } |
| 252 | |
| 253 | private function prepareMemcachedBagOStuffFromParams( array &$params ): void { |
| 254 | $params += [ |
| 255 | 'servers' => $this->options->get( MainConfigNames::MemCachedServers ), |
| 256 | 'persistent' => $this->options->get( MainConfigNames::MemCachedPersistent ), |
| 257 | 'timeout' => $this->options->get( MainConfigNames::MemCachedTimeout ), |
| 258 | ]; |
| 259 | } |
| 260 | |
| 261 | private function prepareMultiWriteBagOStuffFromParams( array &$params ): void { |
| 262 | // Phan warns about foreach with non-array because it |
| 263 | // thinks any key can be Closure|IBufferingStatsdDataFactory |
| 264 | '@phan-var array{caches:array[]} $params'; |
| 265 | foreach ( $params['caches'] ?? [] as $i => $cacheInfo ) { |
| 266 | // Ensure logger, keyspace, asyncHandler, etc are injected just as if |
| 267 | // one of these was configured without MultiWriteBagOStuff. |
| 268 | $params['caches'][$i] = $this->newFromParams( $cacheInfo ); |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | private function prepareRESTBagOStuffFromParams( array &$params ): void { |
| 273 | $params['telemetry'] = Telemetry::getInstance(); |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Factory function for CACHE_ACCEL (referenced from configuration) |
| 278 | * |
| 279 | * This will look for any APC or APCu style server-local cache. |
| 280 | * A fallback cache can be specified if none is found. |
| 281 | * |
| 282 | * // Direct calls |
| 283 | * ObjectCache::getLocalServerInstance( $fallbackType ); |
| 284 | * |
| 285 | * // From $wgObjectCaches via newFromParams() |
| 286 | * ObjectCache::getLocalServerInstance( [ 'fallback' => $fallbackType ] ); |
| 287 | * |
| 288 | * @param int|string|array $fallback Fallback cache or parameter map with 'fallback' |
| 289 | * @return BagOStuff |
| 290 | * @throws InvalidArgumentException |
| 291 | */ |
| 292 | public function getLocalServerInstance( $fallback = CACHE_NONE ): BagOStuff { |
| 293 | $cache = $this->getInstance( CACHE_ACCEL ); |
| 294 | if ( $cache instanceof EmptyBagOStuff ) { |
| 295 | if ( is_array( $fallback ) ) { |
| 296 | $fallback = $fallback['fallback'] ?? CACHE_NONE; |
| 297 | } |
| 298 | $cache = $this->getInstance( $fallback ); |
| 299 | } |
| 300 | |
| 301 | return $cache; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Clear all the cached instances. |
| 306 | */ |
| 307 | public function clear(): void { |
| 308 | $this->instances = []; |
| 309 | } |
| 310 | |
| 311 | /** |
| 312 | * @internal For tests ONLY. |
| 313 | * |
| 314 | * @param string|int $cacheId |
| 315 | * @param BagOStuff $cache |
| 316 | * @return void |
| 317 | */ |
| 318 | public function setInstanceForTesting( $cacheId, BagOStuff $cache ): void { |
| 319 | if ( !defined( 'MW_PHPUNIT_TEST' ) ) { |
| 320 | throw new LogicException( __METHOD__ . ' can not be called outside of tests' ); |
| 321 | } |
| 322 | $this->instances[$cacheId] = $cache; |
| 323 | } |
| 324 | } |