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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | namespace Wikimedia\ObjectCache; |
| 7 | |
| 8 | use Memcached; |
| 9 | use RuntimeException; |
| 10 | use UnexpectedValueException; |
| 11 | use Wikimedia\ScopedCallback; |
| 12 | |
| 13 | /** |
| 14 | * Store data on memcached server(s) via the php-memcached PECL extension. |
| 15 | * |
| 16 | * To use memcached out of the box without any PECL dependency, use the |
| 17 | * MemcachedPhpBagOStuff class instead. |
| 18 | * |
| 19 | * @ingroup Cache |
| 20 | */ |
| 21 | class MemcachedPeclBagOStuff extends MemcachedBagOStuff { |
| 22 | /** @var Memcached */ |
| 23 | protected $client; |
| 24 | |
| 25 | /** |
| 26 | * Available parameters are: |
| 27 | * - servers: List of IP:port combinations holding the memcached servers. |
| 28 | * - persistent: Whether to use a persistent connection |
| 29 | * - compress_threshold: The minimum size an object must be before it is compressed |
| 30 | * - timeout: The read timeout in microseconds |
| 31 | * - connect_timeout: The connect timeout in seconds |
| 32 | * - retry_timeout: Time in seconds to wait before retrying a failed connect attempt |
| 33 | * - server_failure_limit: Limit for server connect failures before it is removed |
| 34 | * - serializer: Either "php" or "igbinary". Igbinary produces more compact |
| 35 | * values, but serialization is much slower unless the php.ini |
| 36 | * option igbinary.compact_strings is off. |
| 37 | * - use_binary_protocol Whether to enable the binary protocol (default is ASCII) |
| 38 | * - allow_tcp_nagle_delay Whether to permit Nagle's algorithm for reducing packet count |
| 39 | * |
| 40 | * @param array $params |
| 41 | */ |
| 42 | public function __construct( $params ) { |
| 43 | parent::__construct( $params ); |
| 44 | |
| 45 | // Default class-specific parameters |
| 46 | $params += [ |
| 47 | 'compress_threshold' => 1500, |
| 48 | 'connect_timeout' => 0.5, |
| 49 | 'timeout' => 500_000, |
| 50 | 'serializer' => 'php', |
| 51 | 'use_binary_protocol' => false, |
| 52 | 'allow_tcp_nagle_delay' => true |
| 53 | ]; |
| 54 | |
| 55 | if ( $params['persistent'] ) { |
| 56 | // The pool ID must be unique to the server/option combination. |
| 57 | // The Memcached object is essentially shared for each pool ID. |
| 58 | // We can only reuse a pool ID if we keep the config consistent. |
| 59 | $connectionPoolId = md5( serialize( $params ) ); |
| 60 | $client = new Memcached( $connectionPoolId ); |
| 61 | } else { |
| 62 | $client = new Memcached(); |
| 63 | } |
| 64 | |
| 65 | $this->initializeClient( $client, $params ); |
| 66 | |
| 67 | $this->client = $client; |
| 68 | // The compression threshold is an undocumented php.ini option for some |
| 69 | // reason. There's probably not much harm in setting it globally, for |
| 70 | // compatibility with the settings for the PHP client. |
| 71 | ini_set( 'memcached.compression_threshold', $params['compress_threshold'] ); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Initialize the client only if needed and reuse it otherwise. |
| 76 | * This avoids duplicate servers in the list and new connections. |
| 77 | * |
| 78 | * @param Memcached $client |
| 79 | * @param array $params |
| 80 | * |
| 81 | * @throws RuntimeException |
| 82 | */ |
| 83 | private function initializeClient( Memcached $client, array $params ) { |
| 84 | if ( $client->getServerList() ) { |
| 85 | $this->logger->debug( __METHOD__ . ": pre-initialized client instance." ); |
| 86 | |
| 87 | return; // preserve persistent handle |
| 88 | } |
| 89 | |
| 90 | $this->logger->debug( __METHOD__ . ": initializing new client instance." ); |
| 91 | |
| 92 | $options = [ |
| 93 | Memcached::OPT_NO_BLOCK => false, |
| 94 | Memcached::OPT_BUFFER_WRITES => false, |
| 95 | Memcached::OPT_NOREPLY => false, |
| 96 | // Network protocol (ASCII or binary) |
| 97 | Memcached::OPT_BINARY_PROTOCOL => $params['use_binary_protocol'], |
| 98 | // Set various network timeouts |
| 99 | Memcached::OPT_CONNECT_TIMEOUT => $params['connect_timeout'] * 1000, |
| 100 | Memcached::OPT_SEND_TIMEOUT => $params['timeout'], |
| 101 | Memcached::OPT_RECV_TIMEOUT => $params['timeout'], |
| 102 | Memcached::OPT_POLL_TIMEOUT => $params['timeout'] / 1000, |
| 103 | // Avoid pointless delay when sending/fetching large blobs |
| 104 | Memcached::OPT_TCP_NODELAY => !$params['allow_tcp_nagle_delay'], |
| 105 | // Set libketama mode since it's recommended by the documentation |
| 106 | Memcached::OPT_LIBKETAMA_COMPATIBLE => true |
| 107 | ]; |
| 108 | if ( isset( $params['retry_timeout'] ) ) { |
| 109 | $options[Memcached::OPT_RETRY_TIMEOUT] = $params['retry_timeout']; |
| 110 | } |
| 111 | if ( isset( $params['server_failure_limit'] ) ) { |
| 112 | $options[Memcached::OPT_SERVER_FAILURE_LIMIT] = $params['server_failure_limit']; |
| 113 | } |
| 114 | if ( $params['serializer'] === 'php' ) { |
| 115 | $options[Memcached::OPT_SERIALIZER] = Memcached::SERIALIZER_PHP; |
| 116 | } elseif ( $params['serializer'] === 'igbinary' ) { |
| 117 | // @phan-suppress-next-line PhanImpossibleCondition |
| 118 | if ( !Memcached::HAVE_IGBINARY ) { |
| 119 | throw new RuntimeException( |
| 120 | __CLASS__ . ': the igbinary extension is not available ' . |
| 121 | 'but igbinary serialization was requested.' |
| 122 | ); |
| 123 | } |
| 124 | $options[Memcached::OPT_SERIALIZER] = Memcached::SERIALIZER_IGBINARY; |
| 125 | } |
| 126 | |
| 127 | if ( !$client->setOptions( $options ) ) { |
| 128 | throw new RuntimeException( |
| 129 | "Invalid options: " . json_encode( $options, JSON_PRETTY_PRINT ) |
| 130 | ); |
| 131 | } |
| 132 | |
| 133 | $servers = []; |
| 134 | foreach ( $params['servers'] as $host ) { |
| 135 | if ( preg_match( '/^\[(.+)\]:(\d+)$/', $host, $m ) ) { |
| 136 | $servers[] = [ $m[1], (int)$m[2] ]; // (ip, port) |
| 137 | } elseif ( preg_match( '/^([^:]+):(\d+)$/', $host, $m ) ) { |
| 138 | $servers[] = [ $m[1], (int)$m[2] ]; // (ip or path, port) |
| 139 | } else { |
| 140 | $servers[] = [ $host, false ]; // (ip or path, port) |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | if ( !$client->addServers( $servers ) ) { |
| 145 | throw new RuntimeException( "Failed to inject server address list" ); |
| 146 | } |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * If $flags is true or is an integer with the WRITE_BACKGROUND bit set, |
| 151 | * enable no-reply mode, and disable it when the scope object is destroyed. |
| 152 | * This makes writes much faster. |
| 153 | * |
| 154 | * @param bool|int $flags |
| 155 | */ |
| 156 | #[\NoDiscard] |
| 157 | private function noReplyScope( $flags ): ?ScopedCallback { |
| 158 | if ( $flags !== true && !( $flags & self::WRITE_BACKGROUND ) ) { |
| 159 | return null; |
| 160 | } |
| 161 | $client = $this->client; |
| 162 | $client->setOption( Memcached::OPT_NOREPLY, true ); |
| 163 | |
| 164 | return new ScopedCallback( static function () use ( $client ) { |
| 165 | $client->setOption( Memcached::OPT_NOREPLY, false ); |
| 166 | } ); |
| 167 | } |
| 168 | |
| 169 | /** @inheritDoc */ |
| 170 | protected function doGet( $key, $flags = 0, &$casToken = null ) { |
| 171 | $getToken = ( $casToken === self::PASS_BY_REF ); |
| 172 | $casToken = null; |
| 173 | |
| 174 | $this->debug( "get($key)" ); |
| 175 | |
| 176 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 177 | |
| 178 | // T257003: only require "gets" (instead of "get") when a CAS token is needed |
| 179 | if ( $getToken ) { |
| 180 | /** @noinspection PhpUndefinedClassConstantInspection */ |
| 181 | $flags = Memcached::GET_EXTENDED; |
| 182 | $res = $this->client->get( $routeKey, null, $flags ); |
| 183 | if ( is_array( $res ) ) { |
| 184 | $result = $res['value']; |
| 185 | $casToken = $res['cas']; |
| 186 | } else { |
| 187 | $result = false; |
| 188 | } |
| 189 | } else { |
| 190 | $result = $this->client->get( $routeKey ); |
| 191 | } |
| 192 | |
| 193 | return $this->checkResult( $key, $result ); |
| 194 | } |
| 195 | |
| 196 | /** @inheritDoc */ |
| 197 | protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) { |
| 198 | $this->debug( "set($key)" ); |
| 199 | |
| 200 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 201 | |
| 202 | $noReplyScope = $this->noReplyScope( $flags ); |
| 203 | $result = $this->client->set( $routeKey, $value, $this->fixExpiry( $exptime ) ); |
| 204 | ScopedCallback::consume( $noReplyScope ); |
| 205 | |
| 206 | return ( !$result && $this->client->getResultCode() === Memcached::RES_NOTSTORED ) |
| 207 | // "Not stored" is always used as the mcrouter response with AllAsyncRoute |
| 208 | ? true |
| 209 | : $this->checkResult( $key, $result ); |
| 210 | } |
| 211 | |
| 212 | /** @inheritDoc */ |
| 213 | protected function doCas( $casToken, $key, $value, $exptime = 0, $flags = 0 ) { |
| 214 | $this->debug( "cas($key)" ); |
| 215 | |
| 216 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 217 | $result = $this->client->cas( |
| 218 | $casToken, |
| 219 | $routeKey, |
| 220 | $value, $this->fixExpiry( $exptime ) |
| 221 | ); |
| 222 | |
| 223 | return $this->checkResult( $key, $result ); |
| 224 | } |
| 225 | |
| 226 | /** @inheritDoc */ |
| 227 | protected function doDelete( $key, $flags = 0 ) { |
| 228 | $this->debug( "delete($key)" ); |
| 229 | |
| 230 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 231 | $noReplyScope = $this->noReplyScope( $flags ); |
| 232 | $result = $this->client->delete( $routeKey ); |
| 233 | ScopedCallback::consume( $noReplyScope ); |
| 234 | |
| 235 | return ( !$result && $this->client->getResultCode() === Memcached::RES_NOTFOUND ) |
| 236 | // "Not found" is counted as success in our interface |
| 237 | ? true |
| 238 | : $this->checkResult( $key, $result ); |
| 239 | } |
| 240 | |
| 241 | /** @inheritDoc */ |
| 242 | protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) { |
| 243 | $this->debug( "add($key)" ); |
| 244 | |
| 245 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 246 | $noReplyScope = $this->noReplyScope( $flags ); |
| 247 | $result = $this->client->add( |
| 248 | $routeKey, |
| 249 | $value, |
| 250 | $this->fixExpiry( $exptime ) |
| 251 | ); |
| 252 | ScopedCallback::consume( $noReplyScope ); |
| 253 | |
| 254 | return $this->checkResult( $key, $result ); |
| 255 | } |
| 256 | |
| 257 | /** @inheritDoc */ |
| 258 | protected function doIncrWithInitAsync( $key, $exptime, $step, $init ) { |
| 259 | $this->debug( "incrWithInit($key)" ); |
| 260 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 261 | $watchPoint = $this->watchErrors(); |
| 262 | $scope = $this->noReplyScope( true ); |
| 263 | $this->checkResult( $key, $this->client->add( $routeKey, $init - $step, $this->fixExpiry( $exptime ) ) ); |
| 264 | $this->checkResult( $key, $this->client->increment( $routeKey, $step ) ); |
| 265 | ScopedCallback::consume( $scope ); |
| 266 | $lastError = $this->getLastError( $watchPoint ); |
| 267 | |
| 268 | return !$lastError; |
| 269 | } |
| 270 | |
| 271 | /** @inheritDoc */ |
| 272 | protected function doIncrWithInitSync( $key, $exptime, $step, $init ) { |
| 273 | $this->debug( "incrWithInit($key)" ); |
| 274 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 275 | $watchPoint = $this->watchErrors(); |
| 276 | $result = $this->client->increment( $routeKey, $step ); |
| 277 | $newValue = $this->checkResult( $key, $result ); |
| 278 | if ( $newValue === false && !$this->getLastError( $watchPoint ) ) { |
| 279 | // No key set; initialize |
| 280 | $result = $this->client->add( $routeKey, $init, $this->fixExpiry( $exptime ) ); |
| 281 | $newValue = $this->checkResult( $key, $result ) ? $init : false; |
| 282 | if ( $newValue === false && !$this->getLastError( $watchPoint ) ) { |
| 283 | // Raced out initializing; increment |
| 284 | $result = $this->client->increment( $routeKey, $step ); |
| 285 | $newValue = $this->checkResult( $key, $result ); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | return $newValue; |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * Check the return value from a client method call and take any necessary |
| 294 | * action. Returns the value that the wrapper function should return. At |
| 295 | * present, the return value is always the same as the return value from |
| 296 | * the client, but some day we might find a case where it should be |
| 297 | * different. |
| 298 | * |
| 299 | * @param string|false $key The key used by the caller, or false if there wasn't one. |
| 300 | * @param mixed $result The return value |
| 301 | * |
| 302 | * @return mixed |
| 303 | */ |
| 304 | protected function checkResult( $key, $result ) { |
| 305 | static $statusByCode = [ |
| 306 | Memcached::RES_HOST_LOOKUP_FAILURE => self::ERR_UNREACHABLE, |
| 307 | Memcached::RES_SERVER_MARKED_DEAD => self::ERR_UNREACHABLE, |
| 308 | Memcached::RES_SERVER_TEMPORARILY_DISABLED => self::ERR_UNREACHABLE, |
| 309 | Memcached::RES_UNKNOWN_READ_FAILURE => self::ERR_NO_RESPONSE, |
| 310 | Memcached::RES_WRITE_FAILURE => self::ERR_NO_RESPONSE, |
| 311 | Memcached::RES_PARTIAL_READ => self::ERR_NO_RESPONSE, |
| 312 | // Hard-code values that only exist in recent versions of the PECL extension. |
| 313 | // https://github.com/JetBrains/phpstorm-stubs/blob/master/memcached/memcached.php |
| 314 | 3 /* Memcached::RES_CONNECTION_FAILURE */ => self::ERR_UNREACHABLE, |
| 315 | 27 /* Memcached::RES_FAIL_UNIX_SOCKET */ => self::ERR_UNREACHABLE, |
| 316 | 6 /* Memcached::RES_READ_FAILURE */ => self::ERR_NO_RESPONSE |
| 317 | ]; |
| 318 | |
| 319 | if ( $result !== false ) { |
| 320 | return $result; |
| 321 | } |
| 322 | |
| 323 | $client = $this->client; |
| 324 | $code = $client->getResultCode(); |
| 325 | switch ( $code ) { |
| 326 | case Memcached::RES_SUCCESS: |
| 327 | break; |
| 328 | case Memcached::RES_DATA_EXISTS: |
| 329 | case Memcached::RES_NOTSTORED: |
| 330 | case Memcached::RES_NOTFOUND: |
| 331 | $this->debug( "result: " . $client->getResultMessage() ); |
| 332 | break; |
| 333 | default: |
| 334 | $msg = $client->getResultMessage(); |
| 335 | $logCtx = []; |
| 336 | if ( $key !== false ) { |
| 337 | $server = $client->getServerByKey( $key ); |
| 338 | $logCtx['memcached-server'] = "{$server['host']}:{$server['port']}"; |
| 339 | $logCtx['memcached-key'] = $key; |
| 340 | $msg = "Memcached error for key \"{memcached-key}\" " . |
| 341 | "on server \"{memcached-server}\": $msg"; |
| 342 | } else { |
| 343 | $msg = "Memcached error: $msg"; |
| 344 | } |
| 345 | $this->logger->error( $msg, $logCtx ); |
| 346 | $this->setLastError( $statusByCode[$code] ?? self::ERR_UNEXPECTED ); |
| 347 | } |
| 348 | |
| 349 | return $result; |
| 350 | } |
| 351 | |
| 352 | /** @inheritDoc */ |
| 353 | protected function doGetMulti( array $keys, $flags = 0 ) { |
| 354 | $this->debug( 'getMulti(' . implode( ', ', $keys ) . ')' ); |
| 355 | |
| 356 | $routeKeys = []; |
| 357 | foreach ( $keys as $key ) { |
| 358 | $routeKeys[] = $this->validateKeyAndPrependRoute( $key ); |
| 359 | } |
| 360 | |
| 361 | // The PECL implementation uses multi-key "get"/"gets"; no need to pipeline. |
| 362 | // T257003: avoid Memcached::GET_EXTENDED; no tokens are needed and that requires "gets" |
| 363 | // https://github.com/libmemcached/libmemcached/blob/eda2becbec24363f56115fa5d16d38a2d1f54775/libmemcached/get.cc#L272 |
| 364 | $resByRouteKey = $this->client->getMulti( $routeKeys ); |
| 365 | |
| 366 | if ( is_array( $resByRouteKey ) ) { |
| 367 | $res = []; |
| 368 | foreach ( $resByRouteKey as $routeKey => $value ) { |
| 369 | $res[$this->stripRouteFromKey( $routeKey )] = $value; |
| 370 | } |
| 371 | } else { |
| 372 | $res = false; |
| 373 | } |
| 374 | |
| 375 | $res = $this->checkResult( false, $res ); |
| 376 | |
| 377 | return $res !== false ? $res : []; |
| 378 | } |
| 379 | |
| 380 | /** @inheritDoc */ |
| 381 | protected function doSetMulti( array $data, $exptime = 0, $flags = 0 ) { |
| 382 | $this->debug( 'setMulti(' . implode( ', ', array_keys( $data ) ) . ')' ); |
| 383 | |
| 384 | $exptime = $this->fixExpiry( $exptime ); |
| 385 | $dataByRouteKey = []; |
| 386 | foreach ( $data as $key => $value ) { |
| 387 | $dataByRouteKey[$this->validateKeyAndPrependRoute( $key )] = $value; |
| 388 | } |
| 389 | |
| 390 | $noReplyScope = $this->noReplyScope( $flags ); |
| 391 | |
| 392 | // Ignore "failed to set" warning from php-memcached 3.x (T251450) |
| 393 | // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged |
| 394 | $result = @$this->client->setMulti( $dataByRouteKey, $exptime ); |
| 395 | ScopedCallback::consume( $noReplyScope ); |
| 396 | |
| 397 | return $this->checkResult( false, $result ); |
| 398 | } |
| 399 | |
| 400 | /** @inheritDoc */ |
| 401 | protected function doDeleteMulti( array $keys, $flags = 0 ) { |
| 402 | $this->debug( 'deleteMulti(' . implode( ', ', $keys ) . ')' ); |
| 403 | |
| 404 | $routeKeys = []; |
| 405 | foreach ( $keys as $key ) { |
| 406 | $routeKeys[] = $this->validateKeyAndPrependRoute( $key ); |
| 407 | } |
| 408 | |
| 409 | $noReplyScope = $this->noReplyScope( $flags ); |
| 410 | $resultArray = $this->client->deleteMulti( $routeKeys ) ?: []; |
| 411 | ScopedCallback::consume( $noReplyScope ); |
| 412 | |
| 413 | $result = true; |
| 414 | foreach ( $resultArray as $code ) { |
| 415 | if ( !in_array( $code, [ true, Memcached::RES_NOTFOUND ], true ) ) { |
| 416 | // "Not found" is counted as success in our interface |
| 417 | $result = false; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | return $this->checkResult( false, $result ); |
| 422 | } |
| 423 | |
| 424 | /** @inheritDoc */ |
| 425 | protected function doChangeTTL( $key, $exptime, $flags ) { |
| 426 | $this->debug( "touch($key)" ); |
| 427 | |
| 428 | $routeKey = $this->validateKeyAndPrependRoute( $key ); |
| 429 | // Avoid NO_REPLY due to libmemcached hang |
| 430 | // https://phabricator.wikimedia.org/T310662#8031692 |
| 431 | $result = $this->client->touch( $routeKey, $this->fixExpiry( $exptime ) ); |
| 432 | |
| 433 | return $this->checkResult( $key, $result ); |
| 434 | } |
| 435 | |
| 436 | /** @inheritDoc */ |
| 437 | protected function serialize( $value ) { |
| 438 | if ( is_int( $value ) ) { |
| 439 | return $value; |
| 440 | } |
| 441 | |
| 442 | $serializer = $this->client->getOption( Memcached::OPT_SERIALIZER ); |
| 443 | if ( $serializer === Memcached::SERIALIZER_PHP ) { |
| 444 | return serialize( $value ); |
| 445 | } elseif ( $serializer === Memcached::SERIALIZER_IGBINARY ) { |
| 446 | return igbinary_serialize( $value ); |
| 447 | } |
| 448 | |
| 449 | throw new UnexpectedValueException( __METHOD__ . ": got serializer '$serializer'." ); |
| 450 | } |
| 451 | |
| 452 | /** @inheritDoc */ |
| 453 | protected function unserialize( $value ) { |
| 454 | if ( $this->isInteger( $value ) ) { |
| 455 | return (int)$value; |
| 456 | } |
| 457 | |
| 458 | $serializer = $this->client->getOption( Memcached::OPT_SERIALIZER ); |
| 459 | if ( $serializer === Memcached::SERIALIZER_PHP ) { |
| 460 | return unserialize( $value ); |
| 461 | } elseif ( $serializer === Memcached::SERIALIZER_IGBINARY ) { |
| 462 | return igbinary_unserialize( $value ); |
| 463 | } |
| 464 | |
| 465 | throw new UnexpectedValueException( __METHOD__ . ": got serializer '$serializer'." ); |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | /** @deprecated class alias since 1.43 */ |
| 470 | class_alias( MemcachedPeclBagOStuff::class, 'MemcachedPeclBagOStuff' ); |