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| 1 | <?php |
| 2 | /** |
| 3 | * Object caching using Redis (http://redis.io/). |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | * |
| 20 | * @file |
| 21 | */ |
| 22 | |
| 23 | /** |
| 24 | * Redis-based caching module for redis server >= 2.6.12 and phpredis >= 2.2.4 |
| 25 | * |
| 26 | * @see https://github.com/phpredis/phpredis/blob/d310ed7c8/Changelog.md |
| 27 | * @note Avoid use of Redis::MULTI transactions for twemproxy support |
| 28 | * |
| 29 | * @ingroup Cache |
| 30 | * @ingroup Redis |
| 31 | * @phan-file-suppress PhanTypeComparisonFromArray It's unclear whether exec() can return false |
| 32 | */ |
| 33 | class RedisBagOStuff extends MediumSpecificBagOStuff { |
| 34 | /** @var RedisConnectionPool */ |
| 35 | protected $redisPool; |
| 36 | /** @var array List of server names */ |
| 37 | protected $servers; |
| 38 | /** @var array Map of (tag => server name) */ |
| 39 | protected $serverTagMap; |
| 40 | /** @var bool */ |
| 41 | protected $automaticFailover; |
| 42 | |
| 43 | /** |
| 44 | * Construct a RedisBagOStuff object. Parameters are: |
| 45 | * |
| 46 | * - servers: An array of server names. A server name may be a hostname, |
| 47 | * a hostname/port combination or the absolute path of a UNIX socket. |
| 48 | * If a hostname is specified but no port, the standard port number |
| 49 | * 6379 will be used. Arrays keys can be used to specify the tag to |
| 50 | * hash on in place of the host/port. Required. |
| 51 | * |
| 52 | * - connectTimeout: The timeout for new connections, in seconds. Optional, |
| 53 | * default is 1 second. |
| 54 | * |
| 55 | * - persistent: Set this to true to allow connections to persist across |
| 56 | * multiple web requests. False by default. |
| 57 | * |
| 58 | * - password: The authentication password, will be sent to Redis in |
| 59 | * clear text. Optional, if it is unspecified, no AUTH command will be |
| 60 | * sent. |
| 61 | * |
| 62 | * - automaticFailover: If this is false, then each key will be mapped to |
| 63 | * a single server, and if that server is down, any requests for that key |
| 64 | * will fail. If this is true, a connection failure will cause the client |
| 65 | * to immediately try the next server in the list (as determined by a |
| 66 | * consistent hashing algorithm). True by default. This has the |
| 67 | * potential to create consistency issues if a server is slow enough to |
| 68 | * flap, for example if it is in swap death. |
| 69 | * @param array $params |
| 70 | */ |
| 71 | public function __construct( $params ) { |
| 72 | parent::__construct( $params ); |
| 73 | $redisConf = [ 'serializer' => 'none' ]; // manage that in this class |
| 74 | foreach ( [ 'connectTimeout', 'persistent', 'password' ] as $opt ) { |
| 75 | if ( isset( $params[$opt] ) ) { |
| 76 | $redisConf[$opt] = $params[$opt]; |
| 77 | } |
| 78 | } |
| 79 | $this->redisPool = RedisConnectionPool::singleton( $redisConf ); |
| 80 | |
| 81 | $this->servers = $params['servers']; |
| 82 | foreach ( $this->servers as $key => $server ) { |
| 83 | $this->serverTagMap[is_int( $key ) ? $server : $key] = $server; |
| 84 | } |
| 85 | |
| 86 | $this->automaticFailover = $params['automaticFailover'] ?? true; |
| 87 | |
| 88 | // ...and uses rdb snapshots (redis.conf default) |
| 89 | $this->attrMap[self::ATTR_DURABILITY] = self::QOS_DURABILITY_DISK; |
| 90 | } |
| 91 | |
| 92 | protected function doGet( $key, $flags = 0, &$casToken = null ) { |
| 93 | $getToken = ( $casToken === self::PASS_BY_REF ); |
| 94 | $casToken = null; |
| 95 | |
| 96 | $conn = $this->getConnection( $key ); |
| 97 | if ( !$conn ) { |
| 98 | return false; |
| 99 | } |
| 100 | |
| 101 | $e = null; |
| 102 | try { |
| 103 | $blob = $conn->get( $key ); |
| 104 | if ( $blob !== false ) { |
| 105 | $value = $this->unserialize( $blob ); |
| 106 | $valueSize = strlen( $blob ); |
| 107 | } else { |
| 108 | $value = false; |
| 109 | $valueSize = false; |
| 110 | } |
| 111 | if ( $getToken && $value !== false ) { |
| 112 | $casToken = $blob; |
| 113 | } |
| 114 | } catch ( RedisException $e ) { |
| 115 | $value = false; |
| 116 | $valueSize = false; |
| 117 | $this->handleException( $conn, $e ); |
| 118 | } |
| 119 | |
| 120 | $this->logRequest( 'get', $key, $conn->getServer(), $e ); |
| 121 | |
| 122 | $this->updateOpStats( self::METRIC_OP_GET, [ $key => [ 0, $valueSize ] ] ); |
| 123 | |
| 124 | return $value; |
| 125 | } |
| 126 | |
| 127 | protected function doSet( $key, $value, $exptime = 0, $flags = 0 ) { |
| 128 | $conn = $this->getConnection( $key ); |
| 129 | if ( !$conn ) { |
| 130 | return false; |
| 131 | } |
| 132 | |
| 133 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 134 | $serialized = $this->getSerialized( $value, $key ); |
| 135 | $valueSize = strlen( $serialized ); |
| 136 | |
| 137 | $e = null; |
| 138 | try { |
| 139 | if ( $ttl ) { |
| 140 | $result = $conn->setex( $key, $ttl, $serialized ); |
| 141 | } else { |
| 142 | $result = $conn->set( $key, $serialized ); |
| 143 | } |
| 144 | } catch ( RedisException $e ) { |
| 145 | $result = false; |
| 146 | $this->handleException( $conn, $e ); |
| 147 | } |
| 148 | |
| 149 | $this->logRequest( 'set', $key, $conn->getServer(), $e ); |
| 150 | |
| 151 | $this->updateOpStats( self::METRIC_OP_SET, [ $key => [ $valueSize, 0 ] ] ); |
| 152 | |
| 153 | return $result; |
| 154 | } |
| 155 | |
| 156 | protected function doDelete( $key, $flags = 0 ) { |
| 157 | $conn = $this->getConnection( $key ); |
| 158 | if ( !$conn ) { |
| 159 | return false; |
| 160 | } |
| 161 | |
| 162 | $e = null; |
| 163 | try { |
| 164 | // Note that redis does not return false if the key was not there |
| 165 | $result = ( $conn->del( $key ) !== false ); |
| 166 | } catch ( RedisException $e ) { |
| 167 | $result = false; |
| 168 | $this->handleException( $conn, $e ); |
| 169 | } |
| 170 | |
| 171 | $this->logRequest( 'delete', $key, $conn->getServer(), $e ); |
| 172 | |
| 173 | $this->updateOpStats( self::METRIC_OP_DELETE, [ $key ] ); |
| 174 | |
| 175 | return $result; |
| 176 | } |
| 177 | |
| 178 | protected function doGetMulti( array $keys, $flags = 0 ) { |
| 179 | $blobsFound = []; |
| 180 | |
| 181 | [ $keysByServer, $connByServer ] = $this->getConnectionsForKeys( $keys ); |
| 182 | foreach ( $keysByServer as $server => $batchKeys ) { |
| 183 | $conn = $connByServer[$server]; |
| 184 | |
| 185 | $e = null; |
| 186 | try { |
| 187 | // Avoid mget() to reduce CPU hogging from a single request |
| 188 | $conn->multi( Redis::PIPELINE ); |
| 189 | foreach ( $batchKeys as $key ) { |
| 190 | $conn->get( $key ); |
| 191 | } |
| 192 | $batchResult = $conn->exec(); |
| 193 | if ( $batchResult === false ) { |
| 194 | $this->logRequest( 'get', implode( ',', $batchKeys ), $server, true ); |
| 195 | continue; |
| 196 | } |
| 197 | |
| 198 | foreach ( $batchResult as $i => $blob ) { |
| 199 | if ( $blob !== false ) { |
| 200 | $blobsFound[$batchKeys[$i]] = $blob; |
| 201 | } |
| 202 | } |
| 203 | } catch ( RedisException $e ) { |
| 204 | $this->handleException( $conn, $e ); |
| 205 | } |
| 206 | |
| 207 | $this->logRequest( 'get', implode( ',', $batchKeys ), $server, $e ); |
| 208 | } |
| 209 | |
| 210 | // Preserve the order of $keys |
| 211 | $result = []; |
| 212 | $valueSizesByKey = []; |
| 213 | foreach ( $keys as $key ) { |
| 214 | if ( array_key_exists( $key, $blobsFound ) ) { |
| 215 | $blob = $blobsFound[$key]; |
| 216 | $value = $this->unserialize( $blob ); |
| 217 | if ( $value !== false ) { |
| 218 | $result[$key] = $value; |
| 219 | } |
| 220 | $valueSize = strlen( $blob ); |
| 221 | } else { |
| 222 | $valueSize = false; |
| 223 | } |
| 224 | $valueSizesByKey[$key] = [ 0, $valueSize ]; |
| 225 | } |
| 226 | |
| 227 | $this->updateOpStats( self::METRIC_OP_GET, $valueSizesByKey ); |
| 228 | |
| 229 | return $result; |
| 230 | } |
| 231 | |
| 232 | protected function doSetMulti( array $data, $exptime = 0, $flags = 0 ) { |
| 233 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 234 | $op = $ttl ? 'setex' : 'set'; |
| 235 | |
| 236 | $keys = array_keys( $data ); |
| 237 | $valueSizesByKey = []; |
| 238 | |
| 239 | [ $keysByServer, $connByServer, $result ] = $this->getConnectionsForKeys( $keys ); |
| 240 | foreach ( $keysByServer as $server => $batchKeys ) { |
| 241 | $conn = $connByServer[$server]; |
| 242 | |
| 243 | $e = null; |
| 244 | try { |
| 245 | // Avoid mset() to reduce CPU hogging from a single request |
| 246 | $conn->multi( Redis::PIPELINE ); |
| 247 | foreach ( $batchKeys as $key ) { |
| 248 | $serialized = $this->getSerialized( $data[$key], $key ); |
| 249 | if ( $ttl ) { |
| 250 | $conn->setex( $key, $ttl, $serialized ); |
| 251 | } else { |
| 252 | $conn->set( $key, $serialized ); |
| 253 | } |
| 254 | $valueSizesByKey[$key] = [ strlen( $serialized ), 0 ]; |
| 255 | } |
| 256 | $batchResult = $conn->exec(); |
| 257 | if ( $batchResult === false ) { |
| 258 | $result = false; |
| 259 | $this->logRequest( $op, implode( ',', $batchKeys ), $server, true ); |
| 260 | continue; |
| 261 | } |
| 262 | |
| 263 | $result = $result && !in_array( false, $batchResult, true ); |
| 264 | } catch ( RedisException $e ) { |
| 265 | $this->handleException( $conn, $e ); |
| 266 | $result = false; |
| 267 | } |
| 268 | |
| 269 | $this->logRequest( $op, implode( ',', $batchKeys ), $server, $e ); |
| 270 | } |
| 271 | |
| 272 | $this->updateOpStats( self::METRIC_OP_SET, $valueSizesByKey ); |
| 273 | |
| 274 | return $result; |
| 275 | } |
| 276 | |
| 277 | protected function doDeleteMulti( array $keys, $flags = 0 ) { |
| 278 | [ $keysByServer, $connByServer, $result ] = $this->getConnectionsForKeys( $keys ); |
| 279 | foreach ( $keysByServer as $server => $batchKeys ) { |
| 280 | $conn = $connByServer[$server]; |
| 281 | |
| 282 | $e = null; |
| 283 | try { |
| 284 | // Avoid delete() with array to reduce CPU hogging from a single request |
| 285 | $conn->multi( Redis::PIPELINE ); |
| 286 | foreach ( $batchKeys as $key ) { |
| 287 | $conn->del( $key ); |
| 288 | } |
| 289 | $batchResult = $conn->exec(); |
| 290 | if ( $batchResult === false ) { |
| 291 | $result = false; |
| 292 | $this->logRequest( 'delete', implode( ',', $batchKeys ), $server, true ); |
| 293 | continue; |
| 294 | } |
| 295 | // Note that redis does not return false if the key was not there |
| 296 | $result = $result && !in_array( false, $batchResult, true ); |
| 297 | } catch ( RedisException $e ) { |
| 298 | $this->handleException( $conn, $e ); |
| 299 | $result = false; |
| 300 | } |
| 301 | |
| 302 | $this->logRequest( 'delete', implode( ',', $batchKeys ), $server, $e ); |
| 303 | } |
| 304 | |
| 305 | $this->updateOpStats( self::METRIC_OP_DELETE, array_values( $keys ) ); |
| 306 | |
| 307 | return $result; |
| 308 | } |
| 309 | |
| 310 | public function doChangeTTLMulti( array $keys, $exptime, $flags = 0 ) { |
| 311 | $relative = $this->isRelativeExpiration( $exptime ); |
| 312 | $op = ( $exptime == self::TTL_INDEFINITE ) |
| 313 | ? 'persist' |
| 314 | : ( $relative ? 'expire' : 'expireAt' ); |
| 315 | |
| 316 | [ $keysByServer, $connByServer, $result ] = $this->getConnectionsForKeys( $keys ); |
| 317 | foreach ( $keysByServer as $server => $batchKeys ) { |
| 318 | $conn = $connByServer[$server]; |
| 319 | |
| 320 | $e = null; |
| 321 | try { |
| 322 | $conn->multi( Redis::PIPELINE ); |
| 323 | foreach ( $batchKeys as $key ) { |
| 324 | if ( $exptime == self::TTL_INDEFINITE ) { |
| 325 | $conn->persist( $key ); |
| 326 | } elseif ( $relative ) { |
| 327 | $conn->expire( $key, $this->getExpirationAsTTL( $exptime ) ); |
| 328 | } else { |
| 329 | $conn->expireAt( $key, $this->getExpirationAsTimestamp( $exptime ) ); |
| 330 | } |
| 331 | } |
| 332 | $batchResult = $conn->exec(); |
| 333 | if ( $batchResult === false ) { |
| 334 | $result = false; |
| 335 | $this->logRequest( $op, implode( ',', $batchKeys ), $server, true ); |
| 336 | continue; |
| 337 | } |
| 338 | $result = in_array( false, $batchResult, true ) ? false : $result; |
| 339 | } catch ( RedisException $e ) { |
| 340 | $this->handleException( $conn, $e ); |
| 341 | $result = false; |
| 342 | } |
| 343 | |
| 344 | $this->logRequest( $op, implode( ',', $batchKeys ), $server, $e ); |
| 345 | } |
| 346 | |
| 347 | $this->updateOpStats( self::METRIC_OP_CHANGE_TTL, array_values( $keys ) ); |
| 348 | |
| 349 | return $result; |
| 350 | } |
| 351 | |
| 352 | protected function doAdd( $key, $value, $exptime = 0, $flags = 0 ) { |
| 353 | $conn = $this->getConnection( $key ); |
| 354 | if ( !$conn ) { |
| 355 | return false; |
| 356 | } |
| 357 | |
| 358 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 359 | $serialized = $this->getSerialized( $value, $key ); |
| 360 | $valueSize = strlen( $serialized ); |
| 361 | |
| 362 | try { |
| 363 | $result = $conn->set( |
| 364 | $key, |
| 365 | $serialized, |
| 366 | $ttl ? [ 'nx', 'ex' => $ttl ] : [ 'nx' ] |
| 367 | ); |
| 368 | } catch ( RedisException $e ) { |
| 369 | $result = false; |
| 370 | $this->handleException( $conn, $e ); |
| 371 | } |
| 372 | |
| 373 | $this->logRequest( 'add', $key, $conn->getServer(), $result ); |
| 374 | |
| 375 | $this->updateOpStats( self::METRIC_OP_ADD, [ $key => [ $valueSize, 0 ] ] ); |
| 376 | |
| 377 | return $result; |
| 378 | } |
| 379 | |
| 380 | protected function doIncrWithInit( $key, $exptime, $step, $init, $flags ) { |
| 381 | $conn = $this->getConnection( $key ); |
| 382 | if ( !$conn ) { |
| 383 | return false; |
| 384 | } |
| 385 | |
| 386 | $ttl = $this->getExpirationAsTTL( $exptime ); |
| 387 | try { |
| 388 | static $script = |
| 389 | /** @lang Lua */ |
| 390 | <<<LUA |
| 391 | local key = KEYS[1] |
| 392 | local ttl, step, init = unpack( ARGV ) |
| 393 | if redis.call( 'exists', key ) == 1 then |
| 394 | return redis.call( 'incrBy', key, step ) |
| 395 | end |
| 396 | if 1 * ttl ~= 0 then |
| 397 | redis.call( 'setex', key, ttl, init ) |
| 398 | else |
| 399 | redis.call( 'set', key, init ) |
| 400 | end |
| 401 | return 1 * init |
| 402 | LUA; |
| 403 | $result = $conn->luaEval( $script, [ $key, $ttl, $step, $init ], 1 ); |
| 404 | } catch ( RedisException $e ) { |
| 405 | $result = false; |
| 406 | $this->handleException( $conn, $e ); |
| 407 | } |
| 408 | $this->logRequest( 'incrWithInit', $key, $conn->getServer(), $result ); |
| 409 | |
| 410 | return $result; |
| 411 | } |
| 412 | |
| 413 | protected function doChangeTTL( $key, $exptime, $flags ) { |
| 414 | $conn = $this->getConnection( $key ); |
| 415 | if ( !$conn ) { |
| 416 | return false; |
| 417 | } |
| 418 | |
| 419 | $relative = $this->isRelativeExpiration( $exptime ); |
| 420 | try { |
| 421 | if ( $exptime == self::TTL_INDEFINITE ) { |
| 422 | $result = $conn->persist( $key ); |
| 423 | $this->logRequest( 'persist', $key, $conn->getServer(), $result ); |
| 424 | } elseif ( $relative ) { |
| 425 | $result = $conn->expire( $key, $this->getExpirationAsTTL( $exptime ) ); |
| 426 | $this->logRequest( 'expire', $key, $conn->getServer(), $result ); |
| 427 | } else { |
| 428 | $result = $conn->expireAt( $key, $this->getExpirationAsTimestamp( $exptime ) ); |
| 429 | $this->logRequest( 'expireAt', $key, $conn->getServer(), $result ); |
| 430 | } |
| 431 | } catch ( RedisException $e ) { |
| 432 | $result = false; |
| 433 | $this->handleException( $conn, $e ); |
| 434 | } |
| 435 | |
| 436 | $this->updateOpStats( self::METRIC_OP_CHANGE_TTL, [ $key ] ); |
| 437 | |
| 438 | return $result; |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * @param string[] $keys |
| 443 | * @return array ((server => redis handle wrapper), (server => key batch), success) |
| 444 | * @phan-return array{0:array<string,string[]>,1:array<string,RedisConnRef|Redis>,2:bool} |
| 445 | */ |
| 446 | protected function getConnectionsForKeys( array $keys ) { |
| 447 | $keysByServer = []; |
| 448 | $connByServer = []; |
| 449 | $success = true; |
| 450 | foreach ( $keys as $key ) { |
| 451 | $candidateTags = $this->getCandidateServerTagsForKey( $key ); |
| 452 | |
| 453 | $conn = null; |
| 454 | // Find a suitable server for this key... |
| 455 | while ( ( $tag = array_shift( $candidateTags ) ) !== null ) { |
| 456 | $server = $this->serverTagMap[$tag]; |
| 457 | // Reuse connection handles for keys mapping to the same server |
| 458 | if ( isset( $connByServer[$server] ) ) { |
| 459 | $conn = $connByServer[$server]; |
| 460 | } else { |
| 461 | $conn = $this->redisPool->getConnection( $server, $this->logger ); |
| 462 | if ( !$conn ) { |
| 463 | continue; |
| 464 | } |
| 465 | // If automatic failover is enabled, check that the server's link |
| 466 | // to its master (if any) is up -- but only if there are other |
| 467 | // viable candidates left to consider. Also, getMasterLinkStatus() |
| 468 | // does not work with twemproxy, though $candidates will be empty |
| 469 | // by now in such cases. |
| 470 | if ( $this->automaticFailover && $candidateTags ) { |
| 471 | try { |
| 472 | /** @var string[] $info */ |
| 473 | $info = $conn->info(); |
| 474 | if ( ( $info['master_link_status'] ?? null ) === 'down' ) { |
| 475 | // If the master cannot be reached, fail-over to the next server. |
| 476 | // If masters are in data-center A, and replica DBs in data-center B, |
| 477 | // this helps avoid the case were fail-over happens in A but not |
| 478 | // to the corresponding server in B (e.g. read/write mismatch). |
| 479 | continue; |
| 480 | } |
| 481 | } catch ( RedisException $e ) { |
| 482 | // Server is not accepting commands |
| 483 | $this->redisPool->handleError( $conn, $e ); |
| 484 | continue; |
| 485 | } |
| 486 | } |
| 487 | // Use this connection handle |
| 488 | $connByServer[$server] = $conn; |
| 489 | } |
| 490 | // Use this server for this key |
| 491 | $keysByServer[$server][] = $key; |
| 492 | break; |
| 493 | } |
| 494 | |
| 495 | if ( !$conn ) { |
| 496 | // No suitable server found for this key |
| 497 | $success = false; |
| 498 | $this->setLastError( BagOStuff::ERR_UNREACHABLE ); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | return [ $keysByServer, $connByServer, $success ]; |
| 503 | } |
| 504 | |
| 505 | /** |
| 506 | * @param string $key |
| 507 | * @return RedisConnRef|Redis|null Redis handle wrapper for the key or null on failure |
| 508 | */ |
| 509 | protected function getConnection( $key ) { |
| 510 | [ , $connByServer ] = $this->getConnectionsForKeys( [ $key ] ); |
| 511 | |
| 512 | return reset( $connByServer ) ?: null; |
| 513 | } |
| 514 | |
| 515 | private function getCandidateServerTagsForKey( string $key ): array { |
| 516 | $candidates = array_keys( $this->serverTagMap ); |
| 517 | |
| 518 | if ( count( $this->servers ) > 1 ) { |
| 519 | ArrayUtils::consistentHashSort( $candidates, $key, '/' ); |
| 520 | if ( !$this->automaticFailover ) { |
| 521 | $candidates = array_slice( $candidates, 0, 1 ); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | return $candidates; |
| 526 | } |
| 527 | |
| 528 | /** |
| 529 | * Log a fatal error |
| 530 | * @param string $msg |
| 531 | */ |
| 532 | protected function logError( $msg ) { |
| 533 | $this->logger->error( "Redis error: $msg" ); |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * The redis extension throws an exception in response to various read, write |
| 538 | * and protocol errors. Sometimes it also closes the connection, sometimes |
| 539 | * not. The safest response for us is to explicitly destroy the connection |
| 540 | * object and let it be reopened during the next request. |
| 541 | * @param RedisConnRef $conn |
| 542 | * @param RedisException $e |
| 543 | */ |
| 544 | protected function handleException( RedisConnRef $conn, RedisException $e ) { |
| 545 | $this->setLastError( BagOStuff::ERR_UNEXPECTED ); |
| 546 | $this->redisPool->handleError( $conn, $e ); |
| 547 | } |
| 548 | |
| 549 | /** |
| 550 | * Send information about a single request to the debug log |
| 551 | * @param string $op |
| 552 | * @param string $keys |
| 553 | * @param string $server |
| 554 | * @param Exception|bool|null $e |
| 555 | */ |
| 556 | public function logRequest( $op, $keys, $server, $e = null ) { |
| 557 | $this->debug( "$op($keys) on $server: " . ( $e ? "failure" : "success" ) ); |
| 558 | } |
| 559 | } |