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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 Psr\Log\LoggerInterface; |
| 23 | use Psr\Log\NullLogger; |
| 24 | use RuntimeException; |
| 25 | use Throwable; |
| 26 | use UnexpectedValueException; |
| 27 | |
| 28 | /** |
| 29 | * @ingroup Database |
| 30 | * @internal This class should not be used outside of Database |
| 31 | */ |
| 32 | class TransactionManager { |
| 33 | /** Transaction is in a error state requiring a full or savepoint rollback */ |
| 34 | public const STATUS_TRX_ERROR = 1; |
| 35 | /** Transaction is active and in a normal state */ |
| 36 | public const STATUS_TRX_OK = 2; |
| 37 | /** No transaction is active */ |
| 38 | public const STATUS_TRX_NONE = 3; |
| 39 | |
| 40 | /** Session is in a error state requiring a reset */ |
| 41 | public const STATUS_SESS_ERROR = 1; |
| 42 | /** Session is in a normal state */ |
| 43 | public const STATUS_SESS_OK = 2; |
| 44 | |
| 45 | /** @var float Guess of how many seconds it takes to replicate a small insert */ |
| 46 | private const TINY_WRITE_SEC = 0.010; |
| 47 | /** @var float Consider a write slow if it took more than this many seconds */ |
| 48 | private const SLOW_WRITE_SEC = 0.500; |
| 49 | /** Assume an insert of this many rows or less should be fast to replicate */ |
| 50 | private const SMALL_WRITE_ROWS = 100; |
| 51 | |
| 52 | /** @var string Prefix to the atomic section counter used to make savepoint IDs */ |
| 53 | private const SAVEPOINT_PREFIX = 'wikimedia_rdbms_atomic'; |
| 54 | |
| 55 | /** @var ?TransactionIdentifier Application-side ID of the active (server-side) transaction */ |
| 56 | private $trxId; |
| 57 | /** @var ?float UNIX timestamp of BEGIN for the last transaction */ |
| 58 | private $trxTimestamp = null; |
| 59 | /** @var ?float Round trip time estimate for queries during the last transaction */ |
| 60 | private $trxRoundTripDelay = null; |
| 61 | /** @var int STATUS_TRX_* constant indicating the transaction lifecycle state */ |
| 62 | private $trxStatus = self::STATUS_TRX_NONE; |
| 63 | /** @var ?Throwable The cause of any unresolved transaction lifecycle state error */ |
| 64 | private $trxStatusCause; |
| 65 | /** @var ?array Details of any unresolved statement-rollback error within a transaction */ |
| 66 | private $trxStatusIgnoredCause; |
| 67 | |
| 68 | /** @var ?Throwable The cause of any unresolved session state loss error */ |
| 69 | private $sessionError; |
| 70 | |
| 71 | /** @var string[] Write query callers of the last transaction */ |
| 72 | private $trxWriteCallers = []; |
| 73 | /** @var float Seconds spent in write queries for the last transaction */ |
| 74 | private $trxWriteDuration = 0.0; |
| 75 | /** @var int Number of write queries for the last transaction */ |
| 76 | private $trxWriteQueryCount = 0; |
| 77 | /** @var int Number of rows affected by write queries for the last transaction */ |
| 78 | private $trxWriteAffectedRows = 0; |
| 79 | /** @var float Like trxWriteQueryCount but excludes lock-bound, easy to replicate, queries */ |
| 80 | private $trxWriteAdjDuration = 0.0; |
| 81 | /** @var int Number of write queries counted in trxWriteAdjDuration */ |
| 82 | private $trxWriteAdjQueryCount = 0; |
| 83 | |
| 84 | /** @var array Pending atomic sections; list of (name, unique ID, savepoint ID) */ |
| 85 | private $trxAtomicLevels = []; |
| 86 | /** @var bool Whether the last transaction was started implicitly due to DBO_TRX */ |
| 87 | private $trxAutomatic = false; |
| 88 | /** @var bool Whether the last transaction was started implicitly by startAtomic() */ |
| 89 | private $trxAutomaticAtomic = false; |
| 90 | |
| 91 | /** @var ?string Name of the function that started the last transaction */ |
| 92 | private $trxFname = null; |
| 93 | /** @var int Counter for atomic savepoint identifiers for the last transaction */ |
| 94 | private $trxAtomicCounter = 0; |
| 95 | |
| 96 | /** |
| 97 | * @var array[] Pending postcommit callbacks; list of (callable, method name, atomic section id) |
| 98 | * @phan-var array<array{0:callable,1:string,2:AtomicSectionIdentifier|null}> |
| 99 | */ |
| 100 | private $trxPostCommitOrIdleCallbacks = []; |
| 101 | /** |
| 102 | * @var array[] Pending precommit callbacks; list of (callable, method name, atomic section id) |
| 103 | * @phan-var array<array{0:callable,1:string,2:AtomicSectionIdentifier|null}> |
| 104 | */ |
| 105 | private $trxPreCommitOrIdleCallbacks = []; |
| 106 | /** |
| 107 | * @var array[] Pending post-trx callbacks; list of (callable, method name, atomic section id) |
| 108 | * @phan-var array<array{0:callable,1:string,2:AtomicSectionIdentifier|null}> |
| 109 | */ |
| 110 | private $trxEndCallbacks = []; |
| 111 | /** @var callable[] Listener callbacks; map of (name => callable) */ |
| 112 | private $trxRecurringCallbacks = []; |
| 113 | /** @var bool Whether to suppress triggering of transaction end callbacks */ |
| 114 | private $trxEndCallbacksSuppressed = false; |
| 115 | |
| 116 | /** @var LoggerInterface */ |
| 117 | private $logger; |
| 118 | /** @var TransactionProfiler */ |
| 119 | private $profiler; |
| 120 | |
| 121 | public function __construct( ?LoggerInterface $logger = null, $profiler = null ) { |
| 122 | $this->logger = $logger ?? new NullLogger(); |
| 123 | $this->profiler = $profiler ?? new TransactionProfiler(); |
| 124 | } |
| 125 | |
| 126 | public function trxLevel() { |
| 127 | return $this->trxId ? 1 : 0; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Get the application-side transaction identifier instance |
| 132 | * |
| 133 | * @return ?TransactionIdentifier Token for the active transaction; null if there isn't one |
| 134 | */ |
| 135 | public function getTrxId() { |
| 136 | return $this->trxId; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Reset the application-side transaction identifier instance and return the old one |
| 141 | * |
| 142 | * @return ?TransactionIdentifier The old transaction token; null if there wasn't one |
| 143 | */ |
| 144 | private function consumeTrxId() { |
| 145 | $old = $this->trxId; |
| 146 | $this->trxId = null; |
| 147 | |
| 148 | return $old; |
| 149 | } |
| 150 | |
| 151 | public function trxTimestamp(): ?float { |
| 152 | return $this->trxLevel() ? $this->trxTimestamp : null; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * @return int One of the STATUS_TRX_* class constants |
| 157 | */ |
| 158 | public function trxStatus(): int { |
| 159 | return $this->trxStatus; |
| 160 | } |
| 161 | |
| 162 | public function setTrxStatusToOk() { |
| 163 | $this->trxStatus = self::STATUS_TRX_OK; |
| 164 | $this->trxStatusCause = null; |
| 165 | $this->trxStatusIgnoredCause = null; |
| 166 | } |
| 167 | |
| 168 | public function setTrxStatusToNone() { |
| 169 | $this->trxStatus = self::STATUS_TRX_NONE; |
| 170 | $this->trxStatusCause = null; |
| 171 | $this->trxStatusIgnoredCause = null; |
| 172 | } |
| 173 | |
| 174 | public function assertTransactionStatus( IDatabase $db, $deprecationLogger, $fname ) { |
| 175 | if ( $this->trxStatus === self::STATUS_TRX_ERROR ) { |
| 176 | throw new DBTransactionStateError( |
| 177 | $db, |
| 178 | "Cannot execute query from $fname while transaction status is ERROR", |
| 179 | [], |
| 180 | $this->trxStatusCause |
| 181 | ); |
| 182 | } elseif ( $this->trxStatus === self::STATUS_TRX_OK && $this->trxStatusIgnoredCause ) { |
| 183 | [ $iLastError, $iLastErrno, $iFname ] = $this->trxStatusIgnoredCause; |
| 184 | $deprecationLogger( |
| 185 | "Caller from $fname ignored an error originally raised from $iFname: " . |
| 186 | "[$iLastErrno] $iLastError" |
| 187 | ); |
| 188 | $this->trxStatusIgnoredCause = null; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | public function assertSessionStatus( IDatabase $db, $fname ) { |
| 193 | if ( $this->sessionError ) { |
| 194 | throw new DBSessionStateError( |
| 195 | $db, |
| 196 | "Cannot execute query from $fname while session status is ERROR", |
| 197 | [], |
| 198 | $this->sessionError |
| 199 | ); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Mark the transaction as requiring rollback (STATUS_TRX_ERROR) due to an error |
| 205 | */ |
| 206 | public function setTransactionError( Throwable $trxError ) { |
| 207 | if ( $this->trxStatus !== self::STATUS_TRX_ERROR ) { |
| 208 | $this->trxStatus = self::STATUS_TRX_ERROR; |
| 209 | $this->trxStatusCause = $trxError; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | public function setTrxStatusIgnoredCause( ?array $trxStatusIgnoredCause ): void { |
| 214 | $this->trxStatusIgnoredCause = $trxStatusIgnoredCause; |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Get the status of the current session (ephemeral server-side state tied to the connection) |
| 219 | * |
| 220 | * @return int One of the STATUS_SESSION_* class constants |
| 221 | */ |
| 222 | public function sessionStatus() { |
| 223 | // Check if an unresolved error still exists |
| 224 | return ( $this->sessionError ) ? self::STATUS_SESS_ERROR : self::STATUS_SESS_OK; |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Flag the session as needing a reset due to an error, if not already flagged |
| 229 | */ |
| 230 | public function setSessionError( Throwable $sessionError ) { |
| 231 | $this->sessionError ??= $sessionError; |
| 232 | } |
| 233 | |
| 234 | /** |
| 235 | * Unflag the session as needing a reset due to an error |
| 236 | */ |
| 237 | public function clearSessionError() { |
| 238 | $this->sessionError = null; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * @param float $rtt |
| 243 | * @return float Time to apply writes to replicas based on trxWrite* fields |
| 244 | */ |
| 245 | private function calculateLastTrxApplyTime( float $rtt ) { |
| 246 | $rttAdjTotal = $this->trxWriteAdjQueryCount * $rtt; |
| 247 | $applyTime = max( $this->trxWriteAdjDuration - $rttAdjTotal, 0.0 ); |
| 248 | // For omitted queries, make them count as something at least |
| 249 | $omitted = $this->trxWriteQueryCount - $this->trxWriteAdjQueryCount; |
| 250 | $applyTime += self::TINY_WRITE_SEC * $omitted; |
| 251 | |
| 252 | return $applyTime; |
| 253 | } |
| 254 | |
| 255 | public function pendingWriteCallers() { |
| 256 | return $this->trxLevel() ? $this->trxWriteCallers : []; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Update the estimated run-time of a query, not counting large row lock times |
| 261 | * |
| 262 | * LoadBalancer can be set to rollback transactions that will create huge replication |
| 263 | * lag. It bases this estimate off of pendingWriteQueryDuration(). Certain simple |
| 264 | * queries, like inserting a row can take a long time due to row locking. This method |
| 265 | * uses some simple heuristics to discount those cases. |
| 266 | * |
| 267 | * @param string $queryVerb action in the write query |
| 268 | * @param float $runtime Total runtime, including RTT |
| 269 | * @param int $affected Affected row count |
| 270 | * @param string $fname method name invoking the action |
| 271 | */ |
| 272 | public function updateTrxWriteQueryReport( $queryVerb, $runtime, $affected, $fname ) { |
| 273 | // Whether this is indicative of replica DB runtime (except for RBR or ws_repl) |
| 274 | $indicativeOfReplicaRuntime = true; |
| 275 | if ( $runtime > self::SLOW_WRITE_SEC ) { |
| 276 | // insert(), upsert(), replace() are fast unless bulky in size or blocked on locks |
| 277 | if ( $queryVerb === 'INSERT' ) { |
| 278 | $indicativeOfReplicaRuntime = $affected > self::SMALL_WRITE_ROWS; |
| 279 | } elseif ( $queryVerb === 'REPLACE' ) { |
| 280 | $indicativeOfReplicaRuntime = $affected > self::SMALL_WRITE_ROWS / 2; |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | $this->trxWriteDuration += $runtime; |
| 285 | $this->trxWriteQueryCount++; |
| 286 | $this->trxWriteAffectedRows += $affected; |
| 287 | if ( $indicativeOfReplicaRuntime ) { |
| 288 | $this->trxWriteAdjDuration += $runtime; |
| 289 | $this->trxWriteAdjQueryCount++; |
| 290 | } |
| 291 | |
| 292 | $this->trxWriteCallers[] = $fname; |
| 293 | } |
| 294 | |
| 295 | public function pendingWriteQueryDuration( $type = IDatabase::ESTIMATE_TOTAL ) { |
| 296 | if ( !$this->trxLevel() ) { |
| 297 | return false; |
| 298 | } elseif ( !$this->trxWriteCallers ) { |
| 299 | return 0.0; |
| 300 | } |
| 301 | |
| 302 | if ( $type === IDatabase::ESTIMATE_DB_APPLY ) { |
| 303 | return $this->calculateLastTrxApplyTime( $this->trxRoundTripDelay ); |
| 304 | } |
| 305 | |
| 306 | return $this->trxWriteDuration; |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * @return string |
| 311 | */ |
| 312 | private function flatAtomicSectionList() { |
| 313 | return array_reduce( $this->trxAtomicLevels, static function ( $accum, $v ) { |
| 314 | return $accum === null ? $v[0] : "$accum, " . $v[0]; |
| 315 | } ); |
| 316 | } |
| 317 | |
| 318 | public function resetTrxAtomicLevels() { |
| 319 | $this->trxAtomicLevels = []; |
| 320 | $this->trxAtomicCounter = 0; |
| 321 | } |
| 322 | |
| 323 | public function explicitTrxActive() { |
| 324 | return $this->trxLevel() && ( $this->trxAtomicLevels || !$this->trxAutomatic ); |
| 325 | } |
| 326 | |
| 327 | public function trxCheckBeforeClose( IDatabaseForOwner $db, $fname ) { |
| 328 | $error = null; |
| 329 | if ( $this->trxAtomicLevels ) { |
| 330 | // Cannot let incomplete atomic sections be committed |
| 331 | $levels = $this->flatAtomicSectionList(); |
| 332 | $error = "$fname: atomic sections $levels are still open"; |
| 333 | } elseif ( $this->trxAutomatic ) { |
| 334 | // Only the connection manager can commit non-empty DBO_TRX transactions |
| 335 | // (empty ones we can silently roll back) |
| 336 | if ( $db->writesOrCallbacksPending() ) { |
| 337 | $error = "$fname: " . |
| 338 | "expected mass rollback of all peer transactions (DBO_TRX set)"; |
| 339 | } |
| 340 | } else { |
| 341 | // Manual transactions should have been committed or rolled |
| 342 | // back, even if empty. |
| 343 | $error = "$fname: transaction is still open (from {$this->trxFname})"; |
| 344 | } |
| 345 | |
| 346 | if ( $this->trxEndCallbacksSuppressed && $error === null ) { |
| 347 | $error = "$fname: callbacks are suppressed; cannot properly commit"; |
| 348 | } |
| 349 | |
| 350 | return $error; |
| 351 | } |
| 352 | |
| 353 | public function onCancelAtomicBeforeCriticalSection( IDatabase $db, $fname ): void { |
| 354 | if ( !$this->trxLevel() || !$this->trxAtomicLevels ) { |
| 355 | throw new DBUnexpectedError( $db, "No atomic section is open (got $fname)" ); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * @return AtomicSectionIdentifier|null ID of the topmost atomic section level |
| 361 | */ |
| 362 | public function currentAtomicSectionId(): ?AtomicSectionIdentifier { |
| 363 | if ( $this->trxLevel() && $this->trxAtomicLevels ) { |
| 364 | $levelInfo = end( $this->trxAtomicLevels ); |
| 365 | |
| 366 | return $levelInfo[1]; |
| 367 | } |
| 368 | |
| 369 | return null; |
| 370 | } |
| 371 | |
| 372 | public function addToAtomicLevels( $fname, AtomicSectionIdentifier $sectionId, $savepointId ) { |
| 373 | $this->trxAtomicLevels[] = [ $fname, $sectionId, $savepointId ]; |
| 374 | $this->logger->debug( 'startAtomic: entering level ' . |
| 375 | ( count( $this->trxAtomicLevels ) - 1 ) . " ($fname)", [ 'db_log_category' => 'trx' ] ); |
| 376 | } |
| 377 | |
| 378 | public function onBegin( IDatabase $db, $fname ): void { |
| 379 | // Protect against mismatched atomic section, transaction nesting, and snapshot loss |
| 380 | if ( $this->trxLevel() ) { |
| 381 | if ( $this->trxAtomicLevels ) { |
| 382 | $levels = $this->flatAtomicSectionList(); |
| 383 | $msg = "$fname: got explicit BEGIN while atomic section(s) $levels are open"; |
| 384 | throw new DBUnexpectedError( $db, $msg ); |
| 385 | } elseif ( !$this->trxAutomatic ) { |
| 386 | $msg = "$fname: explicit transaction already active (from {$this->trxFname})"; |
| 387 | throw new DBUnexpectedError( $db, $msg ); |
| 388 | } else { |
| 389 | $msg = "$fname: implicit transaction already active (from {$this->trxFname})"; |
| 390 | throw new DBUnexpectedError( $db, $msg ); |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * @param IDatabase $db |
| 397 | * @param string $fname |
| 398 | * @param string $flush one of IDatabase::FLUSHING_* values |
| 399 | * @return bool false if the commit should go aborted, true otherwise. |
| 400 | */ |
| 401 | public function onCommit( IDatabase $db, $fname, $flush ): bool { |
| 402 | if ( $this->trxLevel() && $this->trxAtomicLevels ) { |
| 403 | // There are still atomic sections open; this cannot be ignored |
| 404 | $levels = $this->flatAtomicSectionList(); |
| 405 | throw new DBUnexpectedError( |
| 406 | $db, |
| 407 | "$fname: got COMMIT while atomic sections $levels are still open" |
| 408 | ); |
| 409 | } |
| 410 | |
| 411 | if ( $flush === IDatabase::FLUSHING_INTERNAL || $flush === IDatabase::FLUSHING_ALL_PEERS ) { |
| 412 | if ( !$this->trxLevel() ) { |
| 413 | return false; // nothing to do |
| 414 | } elseif ( !$this->trxAutomatic ) { |
| 415 | throw new DBUnexpectedError( |
| 416 | $db, |
| 417 | "$fname: flushing an explicit transaction, getting out of sync" |
| 418 | ); |
| 419 | } |
| 420 | } elseif ( !$this->trxLevel() ) { |
| 421 | $this->logger->error( |
| 422 | "$fname: no transaction to commit, something got out of sync", |
| 423 | [ |
| 424 | 'exception' => new RuntimeException(), |
| 425 | 'db_log_category' => 'trx' |
| 426 | ] |
| 427 | ); |
| 428 | |
| 429 | return false; // nothing to do |
| 430 | } elseif ( $this->trxAutomatic ) { |
| 431 | throw new DBUnexpectedError( |
| 432 | $db, |
| 433 | "$fname: expected mass commit of all peer transactions (DBO_TRX set)" |
| 434 | ); |
| 435 | } |
| 436 | return true; |
| 437 | } |
| 438 | |
| 439 | public function onEndAtomic( IDatabase $db, $fname ): array { |
| 440 | if ( !$this->trxLevel() || !$this->trxAtomicLevels ) { |
| 441 | throw new DBUnexpectedError( $db, "No atomic section is open (got $fname)" ); |
| 442 | } |
| 443 | // Check if the current section matches $fname |
| 444 | $pos = count( $this->trxAtomicLevels ) - 1; |
| 445 | [ $savedFname, $sectionId, $savepointId ] = $this->trxAtomicLevels[$pos]; |
| 446 | $this->logger->debug( "endAtomic: leaving level $pos ($fname)", [ 'db_log_category' => 'trx' ] ); |
| 447 | |
| 448 | if ( $savedFname !== $fname ) { |
| 449 | throw new DBUnexpectedError( |
| 450 | $db, |
| 451 | "Invalid atomic section ended (got $fname but expected $savedFname)" |
| 452 | ); |
| 453 | } |
| 454 | |
| 455 | return [ $savepointId, $sectionId ]; |
| 456 | } |
| 457 | |
| 458 | public function getPositionFromSectionId( ?AtomicSectionIdentifier $sectionId = null ): ?int { |
| 459 | if ( $sectionId !== null ) { |
| 460 | // Find the (last) section with the given $sectionId |
| 461 | $pos = -1; |
| 462 | foreach ( $this->trxAtomicLevels as $i => [ , $asId, ] ) { |
| 463 | if ( $asId === $sectionId ) { |
| 464 | $pos = $i; |
| 465 | } |
| 466 | } |
| 467 | } else { |
| 468 | $pos = null; |
| 469 | } |
| 470 | |
| 471 | return $pos; |
| 472 | } |
| 473 | |
| 474 | public function cancelAtomic( $pos ) { |
| 475 | $excisedIds = []; |
| 476 | $excisedFnames = []; |
| 477 | $newTopSection = $this->currentAtomicSectionId(); |
| 478 | if ( $pos !== null ) { |
| 479 | // Remove all descendant sections and re-index the array |
| 480 | $len = count( $this->trxAtomicLevels ); |
| 481 | for ( $i = $pos + 1; $i < $len; ++$i ) { |
| 482 | $excisedFnames[] = $this->trxAtomicLevels[$i][0]; |
| 483 | $excisedIds[] = $this->trxAtomicLevels[$i][1]; |
| 484 | } |
| 485 | $this->trxAtomicLevels = array_slice( $this->trxAtomicLevels, 0, $pos + 1 ); |
| 486 | $newTopSection = $this->currentAtomicSectionId(); |
| 487 | } |
| 488 | |
| 489 | // Check if the current section matches $fname |
| 490 | $pos = count( $this->trxAtomicLevels ) - 1; |
| 491 | [ $savedFname, $savedSectionId, $savepointId ] = $this->trxAtomicLevels[$pos]; |
| 492 | |
| 493 | if ( $excisedFnames ) { |
| 494 | $this->logger->debug( "cancelAtomic: canceling level $pos ($savedFname) " . |
| 495 | "and descendants " . implode( ', ', $excisedFnames ), |
| 496 | [ 'db_log_category' => 'trx' ] |
| 497 | ); |
| 498 | } else { |
| 499 | $this->logger->debug( "cancelAtomic: canceling level $pos ($savedFname)", |
| 500 | [ 'db_log_category' => 'trx' ] |
| 501 | ); |
| 502 | } |
| 503 | |
| 504 | return [ $savedFname, $excisedIds, $newTopSection, $savedSectionId, $savepointId ]; |
| 505 | } |
| 506 | |
| 507 | /** |
| 508 | * @return bool Whether no levels remain and transaction was started by a popped level |
| 509 | */ |
| 510 | public function popAtomicLevel() { |
| 511 | array_pop( $this->trxAtomicLevels ); |
| 512 | |
| 513 | return !$this->trxAtomicLevels && $this->trxAutomaticAtomic; |
| 514 | } |
| 515 | |
| 516 | public function setAutomaticAtomic( $value ) { |
| 517 | $this->trxAutomaticAtomic = $value; |
| 518 | } |
| 519 | |
| 520 | public function turnOnAutomatic() { |
| 521 | $this->trxAutomatic = true; |
| 522 | } |
| 523 | |
| 524 | public function nextSavePointId( IDatabase $db, $fname ) { |
| 525 | $savepointId = self::SAVEPOINT_PREFIX . ++$this->trxAtomicCounter; |
| 526 | if ( strlen( $savepointId ) > 30 ) { |
| 527 | // 30 == Oracle's identifier length limit (pre 12c) |
| 528 | // With a 22 character prefix, that puts the highest number at 99999999. |
| 529 | throw new DBUnexpectedError( |
| 530 | $db, |
| 531 | 'There have been an excessively large number of atomic sections in a transaction' |
| 532 | . " started by $this->trxFname (at $fname)" |
| 533 | ); |
| 534 | } |
| 535 | |
| 536 | return $savepointId; |
| 537 | } |
| 538 | |
| 539 | public function writesPending() { |
| 540 | return $this->trxLevel() && $this->trxWriteCallers; |
| 541 | } |
| 542 | |
| 543 | public function onDestruct() { |
| 544 | if ( $this->trxLevel() && $this->trxWriteCallers ) { |
| 545 | trigger_error( "Uncommitted DB writes (transaction from {$this->trxFname})" ); |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | public function transactionWritingIn( $serverName, $domainId, float $startTime ) { |
| 550 | if ( !$this->trxWriteCallers ) { |
| 551 | $this->profiler->transactionWritingIn( |
| 552 | $serverName, |
| 553 | $domainId, |
| 554 | (string)$this->trxId, |
| 555 | $startTime |
| 556 | ); |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | public function transactionWritingOut( IDatabase $db, $oldId ) { |
| 561 | if ( $this->trxWriteCallers ) { |
| 562 | $this->profiler->transactionWritingOut( |
| 563 | $db->getServerName(), |
| 564 | $db->getDomainID(), |
| 565 | $oldId, |
| 566 | $this->pendingWriteQueryDuration( IDatabase::ESTIMATE_TOTAL ), |
| 567 | $this->trxWriteAffectedRows |
| 568 | ); |
| 569 | } |
| 570 | } |
| 571 | |
| 572 | public function recordQueryCompletion( $sql, $startTime, $isPermWrite, $rowCount, $serverName ) { |
| 573 | $this->profiler->recordQueryCompletion( |
| 574 | $sql, |
| 575 | $startTime, |
| 576 | $isPermWrite, |
| 577 | $rowCount, |
| 578 | (string)$this->trxId, |
| 579 | $serverName |
| 580 | ); |
| 581 | } |
| 582 | |
| 583 | public function onTransactionResolution( IDatabase $db, callable $callback, $fname ) { |
| 584 | if ( !$this->trxLevel() ) { |
| 585 | throw new DBUnexpectedError( $db, "No transaction is active" ); |
| 586 | } |
| 587 | $this->trxEndCallbacks[] = [ $callback, $fname, $this->currentAtomicSectionId() ]; |
| 588 | } |
| 589 | |
| 590 | public function addPostCommitOrIdleCallback( callable $callback, $fname ) { |
| 591 | $this->trxPostCommitOrIdleCallbacks[] = [ |
| 592 | $callback, |
| 593 | $fname, |
| 594 | $this->currentAtomicSectionId() |
| 595 | ]; |
| 596 | } |
| 597 | |
| 598 | final public function addPreCommitOrIdleCallback( callable $callback, $fname ) { |
| 599 | $this->trxPreCommitOrIdleCallbacks[] = [ |
| 600 | $callback, |
| 601 | $fname, |
| 602 | $this->currentAtomicSectionId() |
| 603 | ]; |
| 604 | } |
| 605 | |
| 606 | public function setTransactionListener( $name, ?callable $callback = null ) { |
| 607 | if ( $callback ) { |
| 608 | $this->trxRecurringCallbacks[$name] = $callback; |
| 609 | } else { |
| 610 | unset( $this->trxRecurringCallbacks[$name] ); |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | /** |
| 615 | * Whether to disable running of post-COMMIT/ROLLBACK callbacks |
| 616 | * @param bool $suppress |
| 617 | */ |
| 618 | public function setTrxEndCallbackSuppression( bool $suppress ) { |
| 619 | $this->trxEndCallbacksSuppressed = $suppress; |
| 620 | } |
| 621 | |
| 622 | /** |
| 623 | * Hoist callback ownership for callbacks in a section to a parent section. |
| 624 | * All callbacks should have an owner that is present in trxAtomicLevels. |
| 625 | * @param AtomicSectionIdentifier $old |
| 626 | * @param AtomicSectionIdentifier $new |
| 627 | */ |
| 628 | public function reassignCallbacksForSection( |
| 629 | AtomicSectionIdentifier $old, |
| 630 | AtomicSectionIdentifier $new |
| 631 | ) { |
| 632 | foreach ( $this->trxPreCommitOrIdleCallbacks as $key => $info ) { |
| 633 | if ( $info[2] === $old ) { |
| 634 | $this->trxPreCommitOrIdleCallbacks[$key][2] = $new; |
| 635 | } |
| 636 | } |
| 637 | foreach ( $this->trxPostCommitOrIdleCallbacks as $key => $info ) { |
| 638 | if ( $info[2] === $old ) { |
| 639 | $this->trxPostCommitOrIdleCallbacks[$key][2] = $new; |
| 640 | } |
| 641 | } |
| 642 | foreach ( $this->trxEndCallbacks as $key => $info ) { |
| 643 | if ( $info[2] === $old ) { |
| 644 | $this->trxEndCallbacks[$key][2] = $new; |
| 645 | } |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | /** |
| 650 | * Update callbacks that were owned by cancelled atomic sections. |
| 651 | * |
| 652 | * Callbacks for "on commit" should never be run if they're owned by a |
| 653 | * section that won't be committed. |
| 654 | * |
| 655 | * Callbacks for "on resolution" need to reflect that the section was |
| 656 | * rolled back, even if the transaction as a whole commits successfully. |
| 657 | * |
| 658 | * Callbacks for "on section cancel" should already have been consumed, |
| 659 | * but errors during the cancellation itself can prevent that while still |
| 660 | * destroying the section. Hoist any such callbacks to the new top section, |
| 661 | * which we assume will itself have to be cancelled or rolled back to |
| 662 | * resolve the error. |
| 663 | * |
| 664 | * @param AtomicSectionIdentifier[] $excisedSectionsId Cancelled section IDs |
| 665 | * @param AtomicSectionIdentifier|null $newSectionId New top section ID |
| 666 | * @throws UnexpectedValueException |
| 667 | */ |
| 668 | public function modifyCallbacksForCancel( |
| 669 | array $excisedSectionsId, |
| 670 | ?AtomicSectionIdentifier $newSectionId = null |
| 671 | ) { |
| 672 | // Cancel the "on commit" callbacks owned by this savepoint |
| 673 | $this->trxPostCommitOrIdleCallbacks = array_filter( |
| 674 | $this->trxPostCommitOrIdleCallbacks, |
| 675 | static function ( $entry ) use ( $excisedSectionsId ) { |
| 676 | return !in_array( $entry[2], $excisedSectionsId, true ); |
| 677 | } |
| 678 | ); |
| 679 | $this->trxPreCommitOrIdleCallbacks = array_filter( |
| 680 | $this->trxPreCommitOrIdleCallbacks, |
| 681 | static function ( $entry ) use ( $excisedSectionsId ) { |
| 682 | return !in_array( $entry[2], $excisedSectionsId, true ); |
| 683 | } |
| 684 | ); |
| 685 | // Make "on resolution" callbacks owned by this savepoint to perceive a rollback |
| 686 | foreach ( $this->trxEndCallbacks as $key => $entry ) { |
| 687 | if ( in_array( $entry[2], $excisedSectionsId, true ) ) { |
| 688 | $callback = $entry[0]; |
| 689 | $this->trxEndCallbacks[$key][0] = static function () use ( $callback ) { |
| 690 | return $callback( IDatabase::TRIGGER_ROLLBACK ); |
| 691 | }; |
| 692 | // This "on resolution" callback no longer belongs to a section. |
| 693 | $this->trxEndCallbacks[$key][2] = null; |
| 694 | } |
| 695 | } |
| 696 | } |
| 697 | |
| 698 | public function consumeEndCallbacks(): array { |
| 699 | $callbackEntries = array_merge( |
| 700 | $this->trxPostCommitOrIdleCallbacks, |
| 701 | $this->trxEndCallbacks |
| 702 | ); |
| 703 | $this->trxPostCommitOrIdleCallbacks = []; // consumed (and recursion guard) |
| 704 | $this->trxEndCallbacks = []; // consumed (recursion guard) |
| 705 | |
| 706 | return $callbackEntries; |
| 707 | } |
| 708 | |
| 709 | /** |
| 710 | * Consume and run any "on transaction pre-commit" callbacks |
| 711 | * |
| 712 | * @return int Number of callbacks attempted |
| 713 | * @throws Throwable Any exception thrown by a callback |
| 714 | */ |
| 715 | public function runOnTransactionPreCommitCallbacks(): int { |
| 716 | $count = 0; |
| 717 | |
| 718 | // Drain the queues of transaction "precommit" callbacks until it is empty |
| 719 | do { |
| 720 | $callbackEntries = $this->trxPreCommitOrIdleCallbacks; |
| 721 | $this->trxPreCommitOrIdleCallbacks = []; // consumed (and recursion guard) |
| 722 | $count += count( $callbackEntries ); |
| 723 | foreach ( $callbackEntries as $entry ) { |
| 724 | try { |
| 725 | $entry[0](); |
| 726 | } catch ( Throwable $trxError ) { |
| 727 | $this->setTransactionError( $trxError ); |
| 728 | throw $trxError; |
| 729 | } |
| 730 | } |
| 731 | // @phan-suppress-next-line PhanImpossibleConditionInLoop |
| 732 | } while ( $this->trxPreCommitOrIdleCallbacks ); |
| 733 | |
| 734 | return $count; |
| 735 | } |
| 736 | |
| 737 | public function clearPreEndCallbacks() { |
| 738 | $this->trxPostCommitOrIdleCallbacks = []; |
| 739 | $this->trxPreCommitOrIdleCallbacks = []; |
| 740 | } |
| 741 | |
| 742 | public function clearEndCallbacks() { |
| 743 | $this->trxEndCallbacks = []; // don't copy |
| 744 | } |
| 745 | |
| 746 | public function writesOrCallbacksPending(): bool { |
| 747 | return $this->trxLevel() && ( |
| 748 | $this->trxWriteCallers || |
| 749 | $this->trxPostCommitOrIdleCallbacks || |
| 750 | $this->trxPreCommitOrIdleCallbacks || |
| 751 | $this->trxEndCallbacks |
| 752 | ); |
| 753 | } |
| 754 | |
| 755 | /** |
| 756 | * List the methods that have write queries or callbacks for the current transaction |
| 757 | * |
| 758 | * @return string[] |
| 759 | */ |
| 760 | public function pendingWriteAndCallbackCallers(): array { |
| 761 | $fnames = $this->pendingWriteCallers(); |
| 762 | foreach ( [ |
| 763 | $this->trxPostCommitOrIdleCallbacks, |
| 764 | $this->trxPreCommitOrIdleCallbacks, |
| 765 | $this->trxEndCallbacks |
| 766 | ] as $callbacks ) { |
| 767 | foreach ( $callbacks as $callback ) { |
| 768 | $fnames[] = $callback[1]; |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | return $fnames; |
| 773 | } |
| 774 | |
| 775 | /** |
| 776 | * List the methods that have precommit callbacks for the current transaction |
| 777 | * |
| 778 | * @return string[] |
| 779 | */ |
| 780 | public function pendingPreCommitCallbackCallers(): array { |
| 781 | $fnames = $this->pendingWriteCallers(); |
| 782 | foreach ( $this->trxPreCommitOrIdleCallbacks as $callback ) { |
| 783 | $fnames[] = $callback[1]; |
| 784 | } |
| 785 | |
| 786 | return $fnames; |
| 787 | } |
| 788 | |
| 789 | public function isEndCallbacksSuppressed(): bool { |
| 790 | return $this->trxEndCallbacksSuppressed; |
| 791 | } |
| 792 | |
| 793 | public function getRecurringCallbacks() { |
| 794 | return $this->trxRecurringCallbacks; |
| 795 | } |
| 796 | |
| 797 | public function countPostCommitOrIdleCallbacks() { |
| 798 | return count( $this->trxPostCommitOrIdleCallbacks ); |
| 799 | } |
| 800 | |
| 801 | /** |
| 802 | * @param string $mode One of IDatabase::TRANSACTION_* values |
| 803 | * @param string $fname method name |
| 804 | * @param float $rtt Trivial query round-trip-delay |
| 805 | */ |
| 806 | public function onBeginInCriticalSection( $mode, $fname, $rtt ) { |
| 807 | $this->trxId = new TransactionIdentifier(); |
| 808 | $this->setTrxStatusToOk(); |
| 809 | $this->resetTrxAtomicLevels(); |
| 810 | $this->trxWriteCallers = []; |
| 811 | $this->trxWriteDuration = 0.0; |
| 812 | $this->trxWriteQueryCount = 0; |
| 813 | $this->trxWriteAffectedRows = 0; |
| 814 | $this->trxWriteAdjDuration = 0.0; |
| 815 | $this->trxWriteAdjQueryCount = 0; |
| 816 | // T147697: make explicitTrxActive() return true until begin() finishes. This way, |
| 817 | // no caller triggered by getApproximateLagStatus() will think its OK to muck around |
| 818 | // with the transaction just because startAtomic() has not yet finished updating the |
| 819 | // tracking fields (e.g. trxAtomicLevels). |
| 820 | $this->trxAutomatic = ( $mode === IDatabase::TRANSACTION_INTERNAL ); |
| 821 | $this->trxAutomaticAtomic = false; |
| 822 | $this->trxFname = $fname; |
| 823 | $this->trxTimestamp = microtime( true ); |
| 824 | $this->trxRoundTripDelay = $rtt; |
| 825 | } |
| 826 | |
| 827 | public function onRollbackInCriticalSection( IDatabase $db ) { |
| 828 | $oldTrxId = $this->consumeTrxId(); |
| 829 | $this->setTrxStatusToNone(); |
| 830 | $this->resetTrxAtomicLevels(); |
| 831 | $this->clearPreEndCallbacks(); |
| 832 | $this->transactionWritingOut( $db, (string)$oldTrxId ); |
| 833 | } |
| 834 | |
| 835 | public function onCommitInCriticalSection( IDatabase $db ) { |
| 836 | $lastWriteTime = null; |
| 837 | |
| 838 | $oldTrxId = $this->consumeTrxId(); |
| 839 | $this->setTrxStatusToNone(); |
| 840 | if ( $this->trxWriteCallers ) { |
| 841 | $lastWriteTime = microtime( true ); |
| 842 | $this->transactionWritingOut( $db, (string)$oldTrxId ); |
| 843 | } |
| 844 | |
| 845 | return $lastWriteTime; |
| 846 | } |
| 847 | |
| 848 | public function onSessionLoss( IDatabase $db ) { |
| 849 | $oldTrxId = $this->consumeTrxId(); |
| 850 | $this->clearPreEndCallbacks(); |
| 851 | $this->transactionWritingOut( $db, (string)$oldTrxId ); |
| 852 | } |
| 853 | |
| 854 | public function onEndAtomicInCriticalSection( $sectionId ) { |
| 855 | // Hoist callback ownership for callbacks in the section that just ended; |
| 856 | // all callbacks should have an owner that is present in trxAtomicLevels. |
| 857 | $currentSectionId = $this->currentAtomicSectionId(); |
| 858 | if ( $currentSectionId ) { |
| 859 | $this->reassignCallbacksForSection( $sectionId, $currentSectionId ); |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | public function onFlushSnapshot( IDatabase $db, $fname, $flush, $trxRoundFname ) { |
| 864 | if ( $this->explicitTrxActive() ) { |
| 865 | // Committing this transaction would break callers that assume it is still open |
| 866 | throw new DBUnexpectedError( |
| 867 | $db, |
| 868 | "$fname: Cannot flush snapshot; " . |
| 869 | "explicit transaction '{$this->trxFname}' is still open" |
| 870 | ); |
| 871 | } elseif ( $this->writesOrCallbacksPending() ) { |
| 872 | // This only flushes transactions to clear snapshots, not to write data |
| 873 | $fnames = implode( ', ', $this->pendingWriteAndCallbackCallers() ); |
| 874 | throw new DBUnexpectedError( |
| 875 | $db, |
| 876 | "$fname: Cannot flush snapshot; " . |
| 877 | "writes from transaction {$this->trxFname} are still pending ($fnames)" |
| 878 | ); |
| 879 | } elseif ( |
| 880 | $this->trxLevel() && |
| 881 | $trxRoundFname !== null && |
| 882 | $flush !== IDatabase::FLUSHING_INTERNAL && |
| 883 | $flush !== IDatabase::FLUSHING_ALL_PEERS |
| 884 | ) { |
| 885 | $this->logger->warning( |
| 886 | "$fname: Expected mass snapshot flush of all peer transactions " . |
| 887 | "in the explicit transactions round '{$trxRoundFname}'", |
| 888 | [ |
| 889 | 'exception' => new RuntimeException(), |
| 890 | 'db_log_category' => 'trx' |
| 891 | ] |
| 892 | ); |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | public function onGetScopedLockAndFlush( IDatabase $db, $fname ) { |
| 897 | if ( $this->writesOrCallbacksPending() ) { |
| 898 | // This only flushes transactions to clear snapshots, not to write data |
| 899 | $fnames = implode( ', ', $this->pendingWriteAndCallbackCallers() ); |
| 900 | throw new DBUnexpectedError( |
| 901 | $db, |
| 902 | "$fname: Cannot flush pre-lock snapshot; " . |
| 903 | "writes from transaction {$this->trxFname} are still pending ($fnames)" |
| 904 | ); |
| 905 | } |
| 906 | } |
| 907 | } |