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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 | namespace Wikimedia\Rdbms; |
| 21 | |
| 22 | use BagOStuff; |
| 23 | use EmptyBagOStuff; |
| 24 | use Exception; |
| 25 | use Generator; |
| 26 | use Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface; |
| 27 | use NullStatsdDataFactory; |
| 28 | use Psr\Log\LoggerInterface; |
| 29 | use Psr\Log\NullLogger; |
| 30 | use RuntimeException; |
| 31 | use Throwable; |
| 32 | use WANObjectCache; |
| 33 | use Wikimedia\RequestTimeout\CriticalSectionProvider; |
| 34 | use Wikimedia\ScopedCallback; |
| 35 | |
| 36 | /** |
| 37 | * @see ILBFactory |
| 38 | * @ingroup Database |
| 39 | */ |
| 40 | abstract class LBFactory implements ILBFactory { |
| 41 | /** @var CriticalSectionProvider|null */ |
| 42 | private $csProvider; |
| 43 | /** |
| 44 | * @var callable|null An optional callback that returns a ScopedCallback instance, |
| 45 | * meant to profile the actual query execution in {@see Database::doQuery} |
| 46 | */ |
| 47 | private $profiler; |
| 48 | /** @var TransactionProfiler */ |
| 49 | private $trxProfiler; |
| 50 | /** @var StatsdDataFactoryInterface */ |
| 51 | private $statsd; |
| 52 | /** @var LoggerInterface */ |
| 53 | private $logger; |
| 54 | /** @var callable Error logger */ |
| 55 | private $errorLogger; |
| 56 | /** @var callable Deprecation logger */ |
| 57 | private $deprecationLogger; |
| 58 | |
| 59 | /** @var ChronologyProtector */ |
| 60 | protected $chronologyProtector; |
| 61 | /** @var BagOStuff */ |
| 62 | protected $srvCache; |
| 63 | /** @var WANObjectCache */ |
| 64 | protected $wanCache; |
| 65 | /** @var DatabaseDomain Local domain */ |
| 66 | protected $localDomain; |
| 67 | |
| 68 | /** @var bool Whether this PHP instance is for a CLI script */ |
| 69 | private $cliMode; |
| 70 | /** @var string Agent name for query profiling */ |
| 71 | private $agent; |
| 72 | |
| 73 | /** @var array[] $aliases Map of (table => (dbname, schema, prefix) map) */ |
| 74 | private $tableAliases = []; |
| 75 | /** @var string[] Map of (index alias => index) */ |
| 76 | private $indexAliases = []; |
| 77 | /** @var DatabaseDomain[]|string[] Map of (domain alias => DB domain) */ |
| 78 | protected $domainAliases = []; |
| 79 | /** @var array[] Map of virtual domain to array of cluster and domain */ |
| 80 | protected array $virtualDomainsMapping = []; |
| 81 | /** @var string[] List of registered virtual domains */ |
| 82 | protected array $virtualDomains = []; |
| 83 | /** @var callable[] */ |
| 84 | private $replicationWaitCallbacks = []; |
| 85 | |
| 86 | /** @var int|null Ticket used to delegate transaction ownership */ |
| 87 | private $ticket; |
| 88 | /** @var string|false String if a requested DBO_TRX transaction round is active */ |
| 89 | private $trxRoundId = false; |
| 90 | /** @var string One of the ROUND_* class constants */ |
| 91 | private $trxRoundStage = self::ROUND_CURSORY; |
| 92 | /** @var int Default replication wait timeout */ |
| 93 | private $replicationWaitTimeout; |
| 94 | |
| 95 | /** @var string|false Reason all LBs are read-only or false if not */ |
| 96 | protected $readOnlyReason = false; |
| 97 | |
| 98 | /** @var string|null */ |
| 99 | private $defaultGroup = null; |
| 100 | |
| 101 | private const ROUND_CURSORY = 'cursory'; |
| 102 | private const ROUND_BEGINNING = 'within-begin'; |
| 103 | private const ROUND_COMMITTING = 'within-commit'; |
| 104 | private const ROUND_ROLLING_BACK = 'within-rollback'; |
| 105 | private const ROUND_COMMIT_CALLBACKS = 'within-commit-callbacks'; |
| 106 | private const ROUND_ROLLBACK_CALLBACKS = 'within-rollback-callbacks'; |
| 107 | private const ROUND_ROLLBACK_SESSIONS = 'within-rollback-session'; |
| 108 | |
| 109 | /** |
| 110 | * @var callable |
| 111 | */ |
| 112 | private $configCallback = null; |
| 113 | |
| 114 | public function __construct( array $conf ) { |
| 115 | $this->configure( $conf ); |
| 116 | |
| 117 | if ( isset( $conf['configCallback'] ) ) { |
| 118 | $this->configCallback = $conf['configCallback']; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * @param array $conf |
| 124 | * @return void |
| 125 | */ |
| 126 | protected function configure( array $conf ): void { |
| 127 | $this->localDomain = isset( $conf['localDomain'] ) |
| 128 | ? DatabaseDomain::newFromId( $conf['localDomain'] ) |
| 129 | : DatabaseDomain::newUnspecified(); |
| 130 | |
| 131 | if ( isset( $conf['readOnlyReason'] ) && is_string( $conf['readOnlyReason'] ) ) { |
| 132 | $this->readOnlyReason = $conf['readOnlyReason']; |
| 133 | } |
| 134 | |
| 135 | $this->chronologyProtector = $conf['chronologyProtector'] ?? new ChronologyProtector(); |
| 136 | $this->srvCache = $conf['srvCache'] ?? new EmptyBagOStuff(); |
| 137 | $this->wanCache = $conf['wanCache'] ?? WANObjectCache::newEmpty(); |
| 138 | |
| 139 | $this->logger = $conf['logger'] ?? new NullLogger(); |
| 140 | $this->errorLogger = $conf['errorLogger'] ?? static function ( Throwable $e ) { |
| 141 | trigger_error( get_class( $e ) . ': ' . $e->getMessage(), E_USER_WARNING ); |
| 142 | }; |
| 143 | $this->deprecationLogger = $conf['deprecationLogger'] ?? static function ( $msg ) { |
| 144 | trigger_error( $msg, E_USER_DEPRECATED ); |
| 145 | }; |
| 146 | |
| 147 | $this->profiler = $conf['profiler'] ?? null; |
| 148 | $this->trxProfiler = $conf['trxProfiler'] ?? new TransactionProfiler(); |
| 149 | $this->statsd = $conf['statsdDataFactory'] ?? new NullStatsdDataFactory(); |
| 150 | |
| 151 | $this->csProvider = $conf['criticalSectionProvider'] ?? null; |
| 152 | |
| 153 | $this->cliMode = $conf['cliMode'] ?? ( PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg' ); |
| 154 | $this->agent = $conf['agent'] ?? ''; |
| 155 | $this->defaultGroup = $conf['defaultGroup'] ?? null; |
| 156 | $this->replicationWaitTimeout = $this->cliMode ? 60 : 1; |
| 157 | $this->virtualDomainsMapping = $conf['virtualDomainsMapping'] ?? []; |
| 158 | $this->virtualDomains = $conf['virtualDomains'] ?? []; |
| 159 | |
| 160 | static $nextTicket; |
| 161 | $this->ticket = $nextTicket = ( is_int( $nextTicket ) ? $nextTicket++ : mt_rand() ); |
| 162 | } |
| 163 | |
| 164 | public function destroy() { |
| 165 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 166 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 167 | |
| 168 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 169 | $lb->disable( __METHOD__ ); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Reload config using the callback passed defined $config['configCallback']. |
| 175 | * |
| 176 | * If the config returned by the callback is different from the existing config, |
| 177 | * this calls reconfigure() on all load balancers, which causes them to invalidate |
| 178 | * any existing connections and re-connect using the new configuration. |
| 179 | * |
| 180 | * Long-running processes should call this from time to time |
| 181 | * (but not too often, because it is somewhat expensive), |
| 182 | * preferably after each batch. |
| 183 | * Maintenance scripts can do that by calling $this->waitForReplication(), |
| 184 | * which calls this method. |
| 185 | */ |
| 186 | public function autoReconfigure(): void { |
| 187 | if ( !$this->configCallback ) { |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | $conf = ( $this->configCallback )(); |
| 192 | if ( $conf ) { |
| 193 | $this->reconfigure( $conf ); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Reconfigure using the given config array. |
| 199 | * Any fields omitted from $conf will be taken from the current config. |
| 200 | * |
| 201 | * If the config changed, this calls reconfigure() on all load balancers, |
| 202 | * which causes them to close all existing connections. |
| 203 | * |
| 204 | * @note This invalidates the current transaction ticket. |
| 205 | * |
| 206 | * @warning This must only be called in top level code such as the execute() |
| 207 | * method of a maintenance script. Any database connection in use when this |
| 208 | * method is called will become defunct. |
| 209 | * |
| 210 | * @since 1.39 |
| 211 | * |
| 212 | * @param array $conf A configuration array, using the same structure as |
| 213 | * the one passed to the constructor (see also $wgLBFactoryConf). |
| 214 | */ |
| 215 | public function reconfigure( array $conf ): void { |
| 216 | if ( !$conf ) { |
| 217 | return; |
| 218 | } |
| 219 | |
| 220 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 221 | $lb->reconfigure( $conf ); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | public function getLocalDomainID() { |
| 226 | return $this->localDomain->getId(); |
| 227 | } |
| 228 | |
| 229 | public function shutdown( |
| 230 | $flags = self::SHUTDOWN_NORMAL, |
| 231 | callable $workCallback = null, |
| 232 | &$cpIndex = null, |
| 233 | &$cpClientId = null |
| 234 | ) { |
| 235 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 236 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 237 | |
| 238 | if ( ( $flags & self::SHUTDOWN_NO_CHRONPROT ) != self::SHUTDOWN_NO_CHRONPROT ) { |
| 239 | // Remark all of the relevant DB primary positions |
| 240 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 241 | if ( $lb->hasPrimaryConnection() ) { |
| 242 | $this->chronologyProtector->stageSessionPrimaryPos( $lb ); |
| 243 | } |
| 244 | } |
| 245 | // Write the positions to the persistent stash |
| 246 | $this->chronologyProtector->persistSessionReplicationPositions( $cpIndex ); |
| 247 | $this->logger->debug( __METHOD__ . ': finished ChronologyProtector shutdown' ); |
| 248 | } |
| 249 | $cpClientId = $this->chronologyProtector->getClientId(); |
| 250 | |
| 251 | $this->commitPrimaryChanges( __METHOD__ ); |
| 252 | |
| 253 | $this->logger->debug( 'LBFactory shutdown completed' ); |
| 254 | } |
| 255 | |
| 256 | public function getAllLBs() { |
| 257 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 258 | yield $lb; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | * Get all tracked load balancers with the internal "for owner" interface. |
| 264 | * Most subclasses override this, we just provide an implementation here |
| 265 | * for the benefit of Wikibase's FakeLBFactory. |
| 266 | * |
| 267 | * @return Generator|ILoadBalancerForOwner[] |
| 268 | */ |
| 269 | abstract protected function getLBsForOwner(); |
| 270 | |
| 271 | public function flushReplicaSnapshots( $fname = __METHOD__ ) { |
| 272 | if ( $this->trxRoundId !== false && $this->trxRoundId !== $fname ) { |
| 273 | $this->logger->warning( |
| 274 | "$fname: transaction round '{$this->trxRoundId}' still running", |
| 275 | [ 'exception' => new RuntimeException() ] |
| 276 | ); |
| 277 | } |
| 278 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 279 | $lb->flushReplicaSnapshots( $fname ); |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | final public function beginPrimaryChanges( $fname = __METHOD__ ) { |
| 284 | $this->assertTransactionRoundStage( self::ROUND_CURSORY ); |
| 285 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 286 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 287 | |
| 288 | $this->trxRoundStage = self::ROUND_BEGINNING; |
| 289 | if ( $this->trxRoundId !== false ) { |
| 290 | throw new DBTransactionError( |
| 291 | null, |
| 292 | "$fname: transaction round '{$this->trxRoundId}' already started" |
| 293 | ); |
| 294 | } |
| 295 | $this->trxRoundId = $fname; |
| 296 | // Set DBO_TRX flags on all appropriate DBs |
| 297 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 298 | $lb->beginPrimaryChanges( $fname ); |
| 299 | } |
| 300 | $this->trxRoundStage = self::ROUND_CURSORY; |
| 301 | } |
| 302 | |
| 303 | final public function commitPrimaryChanges( $fname = __METHOD__, int $maxWriteDuration = 0 ) { |
| 304 | $this->assertTransactionRoundStage( self::ROUND_CURSORY ); |
| 305 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 306 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 307 | |
| 308 | $this->trxRoundStage = self::ROUND_COMMITTING; |
| 309 | if ( $this->trxRoundId !== false && $this->trxRoundId !== $fname ) { |
| 310 | throw new DBTransactionError( |
| 311 | null, |
| 312 | "$fname: transaction round '{$this->trxRoundId}' still running" |
| 313 | ); |
| 314 | } |
| 315 | // Run pre-commit callbacks and suppress post-commit callbacks, aborting on failure |
| 316 | do { |
| 317 | $count = 0; // number of callbacks executed this iteration |
| 318 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 319 | $count += $lb->finalizePrimaryChanges( $fname ); |
| 320 | } |
| 321 | } while ( $count > 0 ); |
| 322 | $this->trxRoundId = false; |
| 323 | // Perform pre-commit checks, aborting on failure |
| 324 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 325 | $lb->approvePrimaryChanges( $maxWriteDuration, $fname ); |
| 326 | } |
| 327 | // Log the DBs and methods involved in multi-DB transactions |
| 328 | $this->logIfMultiDbTransaction(); |
| 329 | // Actually perform the commit on all primary DB connections and revert DBO_TRX |
| 330 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 331 | $lb->commitPrimaryChanges( $fname ); |
| 332 | } |
| 333 | // Run all post-commit callbacks in a separate step |
| 334 | $e = $this->executePostTransactionCallbacks(); |
| 335 | // Throw any last post-commit callback error |
| 336 | if ( $e instanceof Exception ) { |
| 337 | throw $e; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | final public function rollbackPrimaryChanges( $fname = __METHOD__ ) { |
| 342 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 343 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 344 | |
| 345 | $this->trxRoundStage = self::ROUND_ROLLING_BACK; |
| 346 | $this->trxRoundId = false; |
| 347 | // Actually perform the rollback on all primary DB connections and revert DBO_TRX |
| 348 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 349 | $lb->rollbackPrimaryChanges( $fname ); |
| 350 | } |
| 351 | // Run all post-commit callbacks in a separate step |
| 352 | $this->executePostTransactionCallbacks(); |
| 353 | } |
| 354 | |
| 355 | final public function flushPrimarySessions( $fname = __METHOD__ ) { |
| 356 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 357 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 358 | |
| 359 | // Release named locks and table locks on all primary DB connections |
| 360 | $this->trxRoundStage = self::ROUND_ROLLBACK_SESSIONS; |
| 361 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 362 | $lb->flushPrimarySessions( $fname ); |
| 363 | } |
| 364 | $this->trxRoundStage = self::ROUND_CURSORY; |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * @return Exception|null |
| 369 | */ |
| 370 | private function executePostTransactionCallbacks() { |
| 371 | $this->trxRoundStage = self::ROUND_COMMIT_CALLBACKS; |
| 372 | $fname = __METHOD__; |
| 373 | // Run all post-commit callbacks until new ones stop getting added |
| 374 | $e = null; // first callback exception |
| 375 | do { |
| 376 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 377 | $ex = $lb->runPrimaryTransactionIdleCallbacks( $fname ); |
| 378 | $e = $e ?: $ex; |
| 379 | } |
| 380 | } while ( $this->hasPrimaryChanges() ); |
| 381 | // Run all listener callbacks once |
| 382 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 383 | $ex = $lb->runPrimaryTransactionListenerCallbacks( $fname ); |
| 384 | $e = $e ?: $ex; |
| 385 | } |
| 386 | $this->trxRoundStage = self::ROUND_CURSORY; |
| 387 | |
| 388 | return $e; |
| 389 | } |
| 390 | |
| 391 | public function hasTransactionRound() { |
| 392 | return ( $this->trxRoundId !== false ); |
| 393 | } |
| 394 | |
| 395 | public function isReadyForRoundOperations() { |
| 396 | return ( $this->trxRoundStage === self::ROUND_CURSORY ); |
| 397 | } |
| 398 | |
| 399 | /** |
| 400 | * Log query info if multi DB transactions are going to be committed now |
| 401 | */ |
| 402 | private function logIfMultiDbTransaction() { |
| 403 | $callersByDB = []; |
| 404 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 405 | $primaryName = $lb->getServerName( $lb->getWriterIndex() ); |
| 406 | $callers = $lb->pendingPrimaryChangeCallers(); |
| 407 | if ( $callers ) { |
| 408 | $callersByDB[$primaryName] = $callers; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | if ( count( $callersByDB ) >= 2 ) { |
| 413 | $dbs = implode( ', ', array_keys( $callersByDB ) ); |
| 414 | $msg = "Multi-DB transaction [{$dbs}]:\n"; |
| 415 | foreach ( $callersByDB as $db => $callers ) { |
| 416 | $msg .= "$db: " . implode( '; ', $callers ) . "\n"; |
| 417 | } |
| 418 | $this->logger->info( $msg ); |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | public function hasPrimaryChanges() { |
| 423 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 424 | if ( $lb->hasPrimaryChanges() ) { |
| 425 | return true; |
| 426 | } |
| 427 | } |
| 428 | return false; |
| 429 | } |
| 430 | |
| 431 | public function laggedReplicaUsed() { |
| 432 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 433 | if ( $lb->laggedReplicaUsed() ) { |
| 434 | return true; |
| 435 | } |
| 436 | } |
| 437 | return false; |
| 438 | } |
| 439 | |
| 440 | public function hasOrMadeRecentPrimaryChanges( $age = null ) { |
| 441 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 442 | if ( $lb->hasOrMadeRecentPrimaryChanges( $age ) ) { |
| 443 | return true; |
| 444 | } |
| 445 | } |
| 446 | return false; |
| 447 | } |
| 448 | |
| 449 | public function waitForReplication( array $opts = [] ) { |
| 450 | $opts += [ |
| 451 | 'timeout' => $this->replicationWaitTimeout, |
| 452 | 'ifWritesSince' => null |
| 453 | ]; |
| 454 | |
| 455 | $lbs = []; |
| 456 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 457 | $lbs[] = $lb; |
| 458 | } |
| 459 | if ( !$lbs ) { |
| 460 | return true; // nothing actually used |
| 461 | } |
| 462 | |
| 463 | // Get all the primary DB positions of applicable DBs right now. |
| 464 | // This can be faster since waiting on one cluster reduces the |
| 465 | // time needed to wait on the next clusters. |
| 466 | $primaryPositions = array_fill( 0, count( $lbs ), false ); |
| 467 | foreach ( $lbs as $i => $lb ) { |
| 468 | if ( |
| 469 | // No writes to wait on getting replicated |
| 470 | !$lb->hasPrimaryConnection() || |
| 471 | // No replication; avoid getPrimaryPos() permissions errors (T29975) |
| 472 | !$lb->hasStreamingReplicaServers() || |
| 473 | // No writes since the last replication wait |
| 474 | ( |
| 475 | $opts['ifWritesSince'] && |
| 476 | $lb->lastPrimaryChangeTimestamp() < $opts['ifWritesSince'] |
| 477 | ) |
| 478 | ) { |
| 479 | continue; // no need to wait |
| 480 | } |
| 481 | |
| 482 | $primaryPositions[$i] = $lb->getPrimaryPos(); |
| 483 | } |
| 484 | |
| 485 | // Run any listener callbacks *after* getting the DB positions. The more |
| 486 | // time spent in the callbacks, the less time is spent in waitForAll(). |
| 487 | foreach ( $this->replicationWaitCallbacks as $callback ) { |
| 488 | $callback(); |
| 489 | } |
| 490 | |
| 491 | $failed = []; |
| 492 | foreach ( $lbs as $i => $lb ) { |
| 493 | if ( $primaryPositions[$i] ) { |
| 494 | // The RDBMS may not support getPrimaryPos() |
| 495 | if ( !$lb->waitForAll( $primaryPositions[$i], $opts['timeout'] ) ) { |
| 496 | $failed[] = $lb->getServerName( $lb->getWriterIndex() ); |
| 497 | } |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | return !$failed; |
| 502 | } |
| 503 | |
| 504 | public function setWaitForReplicationListener( $name, callable $callback = null ) { |
| 505 | if ( $callback ) { |
| 506 | $this->replicationWaitCallbacks[$name] = $callback; |
| 507 | } else { |
| 508 | unset( $this->replicationWaitCallbacks[$name] ); |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | public function getEmptyTransactionTicket( $fname ) { |
| 513 | if ( $this->hasPrimaryChanges() ) { |
| 514 | $this->logger->error( |
| 515 | __METHOD__ . ": $fname does not have outer scope", |
| 516 | [ 'exception' => new RuntimeException() ] |
| 517 | ); |
| 518 | |
| 519 | return null; |
| 520 | } |
| 521 | |
| 522 | return $this->ticket; |
| 523 | } |
| 524 | |
| 525 | public function getPrimaryDatabase( $domain = false ): IDatabase { |
| 526 | return $this->getMappedDatabase( DB_PRIMARY, [], $domain ); |
| 527 | } |
| 528 | |
| 529 | public function getReplicaDatabase( $domain = false, $group = null ): IReadableDatabase { |
| 530 | if ( $group === null ) { |
| 531 | $groups = []; |
| 532 | } else { |
| 533 | $groups = [ $group ]; |
| 534 | } |
| 535 | return $this->getMappedDatabase( DB_REPLICA, $groups, $domain ); |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * Helper for getPrimaryDatabase and getReplicaDatabase() providing virtual |
| 540 | * domain mapping. |
| 541 | * |
| 542 | * @param int $index |
| 543 | * @param array $groups |
| 544 | * @param string|false $domain |
| 545 | * @return IDatabase |
| 546 | */ |
| 547 | private function getMappedDatabase( $index, $groups, $domain ) { |
| 548 | if ( $domain !== false && in_array( $domain, $this->virtualDomains ) ) { |
| 549 | if ( isset( $this->virtualDomainsMapping[$domain] ) ) { |
| 550 | $config = $this->virtualDomainsMapping[$domain]; |
| 551 | if ( isset( $config['cluster'] ) ) { |
| 552 | return $this |
| 553 | ->getExternalLB( $config['cluster'] ) |
| 554 | ->getConnection( $index, $groups, $config['db'] ); |
| 555 | } |
| 556 | $domain = $config['db']; |
| 557 | } else { |
| 558 | // It's not configured, assume local db. |
| 559 | $domain = false; |
| 560 | } |
| 561 | } |
| 562 | return $this->getMainLB( $domain )->getConnection( $index, $groups, $domain ); |
| 563 | } |
| 564 | |
| 565 | final public function commitAndWaitForReplication( $fname, $ticket, array $opts = [] ) { |
| 566 | if ( $ticket !== $this->ticket ) { |
| 567 | $this->logger->error( |
| 568 | __METHOD__ . ": $fname does not have outer scope ($ticket vs {$this->ticket})", |
| 569 | [ 'exception' => new RuntimeException() ] |
| 570 | ); |
| 571 | |
| 572 | return false; |
| 573 | } |
| 574 | |
| 575 | // The transaction owner and any caller with the empty transaction ticket can commit |
| 576 | // so that getEmptyTransactionTicket() callers don't risk seeing DBTransactionError. |
| 577 | if ( $this->trxRoundId !== false && $fname !== $this->trxRoundId ) { |
| 578 | $this->logger->info( "$fname: committing on behalf of {$this->trxRoundId}" ); |
| 579 | $fnameEffective = $this->trxRoundId; |
| 580 | } else { |
| 581 | $fnameEffective = $fname; |
| 582 | } |
| 583 | |
| 584 | $this->commitPrimaryChanges( $fnameEffective ); |
| 585 | $waitSucceeded = $this->waitForReplication( $opts ); |
| 586 | // If a nested caller committed on behalf of $fname, start another empty $fname |
| 587 | // transaction, leaving the caller with the same empty transaction state as before. |
| 588 | if ( $fnameEffective !== $fname ) { |
| 589 | $this->beginPrimaryChanges( $fnameEffective ); |
| 590 | } |
| 591 | |
| 592 | return $waitSucceeded; |
| 593 | } |
| 594 | |
| 595 | public function disableChronologyProtection() { |
| 596 | $this->chronologyProtector->setEnabled( false ); |
| 597 | } |
| 598 | |
| 599 | /** |
| 600 | * Get parameters to ILoadBalancer::__construct() |
| 601 | * |
| 602 | * @return array |
| 603 | */ |
| 604 | final protected function baseLoadBalancerParams() { |
| 605 | if ( $this->trxRoundStage === self::ROUND_COMMIT_CALLBACKS ) { |
| 606 | $initStage = ILoadBalancerForOwner::STAGE_POSTCOMMIT_CALLBACKS; |
| 607 | } elseif ( $this->trxRoundStage === self::ROUND_ROLLBACK_CALLBACKS ) { |
| 608 | $initStage = ILoadBalancerForOwner::STAGE_POSTROLLBACK_CALLBACKS; |
| 609 | } else { |
| 610 | $initStage = null; |
| 611 | } |
| 612 | |
| 613 | return [ |
| 614 | 'localDomain' => $this->localDomain, |
| 615 | 'readOnlyReason' => $this->readOnlyReason, |
| 616 | 'srvCache' => $this->srvCache, |
| 617 | 'wanCache' => $this->wanCache, |
| 618 | 'profiler' => $this->profiler, |
| 619 | 'trxProfiler' => $this->trxProfiler, |
| 620 | 'logger' => $this->logger, |
| 621 | 'errorLogger' => $this->errorLogger, |
| 622 | 'deprecationLogger' => $this->deprecationLogger, |
| 623 | 'statsdDataFactory' => $this->statsd, |
| 624 | 'cliMode' => $this->cliMode, |
| 625 | 'agent' => $this->agent, |
| 626 | 'defaultGroup' => $this->defaultGroup, |
| 627 | 'chronologyProtector' => $this->chronologyProtector, |
| 628 | 'roundStage' => $initStage, |
| 629 | 'criticalSectionProvider' => $this->csProvider |
| 630 | ]; |
| 631 | } |
| 632 | |
| 633 | /** |
| 634 | * @param ILoadBalancerForOwner $lb |
| 635 | */ |
| 636 | protected function initLoadBalancer( ILoadBalancerForOwner $lb ) { |
| 637 | if ( $this->trxRoundId !== false ) { |
| 638 | $lb->beginPrimaryChanges( $this->trxRoundId ); // set DBO_TRX |
| 639 | } |
| 640 | |
| 641 | $lb->setTableAliases( $this->tableAliases ); |
| 642 | $lb->setIndexAliases( $this->indexAliases ); |
| 643 | $lb->setDomainAliases( $this->domainAliases ); |
| 644 | } |
| 645 | |
| 646 | public function setTableAliases( array $aliases ) { |
| 647 | $this->tableAliases = $aliases; |
| 648 | } |
| 649 | |
| 650 | public function setIndexAliases( array $aliases ) { |
| 651 | $this->indexAliases = $aliases; |
| 652 | } |
| 653 | |
| 654 | public function setDomainAliases( array $aliases ) { |
| 655 | $this->domainAliases = $aliases; |
| 656 | } |
| 657 | |
| 658 | public function getTransactionProfiler(): TransactionProfiler { |
| 659 | return $this->trxProfiler; |
| 660 | } |
| 661 | |
| 662 | public function setLocalDomainPrefix( $prefix ) { |
| 663 | $this->localDomain = new DatabaseDomain( |
| 664 | $this->localDomain->getDatabase(), |
| 665 | $this->localDomain->getSchema(), |
| 666 | $prefix |
| 667 | ); |
| 668 | |
| 669 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 670 | $lb->setLocalDomainPrefix( $prefix ); |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | public function redefineLocalDomain( $domain ) { |
| 675 | $this->closeAll( __METHOD__ ); |
| 676 | |
| 677 | $this->localDomain = DatabaseDomain::newFromId( $domain ); |
| 678 | |
| 679 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 680 | $lb->redefineLocalDomain( $this->localDomain ); |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | public function closeAll( $fname = __METHOD__ ) { |
| 685 | /** @noinspection PhpUnusedLocalVariableInspection */ |
| 686 | $scope = ScopedCallback::newScopedIgnoreUserAbort(); |
| 687 | |
| 688 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 689 | $lb->closeAll( $fname ); |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | public function setAgentName( $agent ) { |
| 694 | $this->agent = $agent; |
| 695 | } |
| 696 | |
| 697 | public function hasStreamingReplicaServers() { |
| 698 | foreach ( $this->getLBsForOwner() as $lb ) { |
| 699 | if ( $lb->hasStreamingReplicaServers() ) { |
| 700 | return true; |
| 701 | } |
| 702 | } |
| 703 | return false; |
| 704 | } |
| 705 | |
| 706 | public function setDefaultReplicationWaitTimeout( $seconds ) { |
| 707 | $old = $this->replicationWaitTimeout; |
| 708 | $this->replicationWaitTimeout = max( 1, (int)$seconds ); |
| 709 | |
| 710 | return $old; |
| 711 | } |
| 712 | |
| 713 | /** |
| 714 | * @param string $stage |
| 715 | */ |
| 716 | private function assertTransactionRoundStage( $stage ) { |
| 717 | if ( $this->trxRoundStage !== $stage ) { |
| 718 | throw new DBTransactionError( |
| 719 | null, |
| 720 | "Transaction round stage must be '$stage' (not '{$this->trxRoundStage}')" |
| 721 | ); |
| 722 | } |
| 723 | } |
| 724 | } |