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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\LoggerAwareInterface; |
| 23 | use Psr\Log\LoggerInterface; |
| 24 | use Psr\Log\NullLogger; |
| 25 | use RuntimeException; |
| 26 | use Wikimedia\ScopedCallback; |
| 27 | use Wikimedia\Stats\StatsFactory; |
| 28 | |
| 29 | /** |
| 30 | * Detect high-contention DB queries via profiling calls. |
| 31 | * |
| 32 | * This class is meant to work with an IDatabase object, which manages queries. |
| 33 | * |
| 34 | * @internal For use by Database only |
| 35 | * @since 1.24 |
| 36 | * @ingroup Profiler |
| 37 | * @ingroup Database |
| 38 | */ |
| 39 | class TransactionProfiler implements LoggerAwareInterface { |
| 40 | /** @var LoggerInterface */ |
| 41 | private $logger; |
| 42 | /** @var StatsFactory */ |
| 43 | private $statsFactory; |
| 44 | /** @var array<string,array> Map of (event name => map of FLD_* class constants) */ |
| 45 | private $expect; |
| 46 | /** @var array<string,int> Map of (event name => current hits) */ |
| 47 | private $hits; |
| 48 | /** @var array<string,int> Map of (event name => violation counter) */ |
| 49 | private $violations; |
| 50 | /** @var array<string,int> Map of (event name => silence counter) */ |
| 51 | private $silenced; |
| 52 | |
| 53 | /** |
| 54 | * @var array<string,array> Map of (trx ID => (write start time, list of DBs involved)) |
| 55 | * @phan-var array<string,array{start:float,conns:array<string,int>}> |
| 56 | */ |
| 57 | private $dbTrxHoldingLocks; |
| 58 | |
| 59 | /** |
| 60 | * @var array[][] Map of (trx ID => list of (query name, start time, end time)) |
| 61 | * @phan-var array<string,array<int,array{0:string|GeneralizedSQL,1:float,2:float}>> |
| 62 | */ |
| 63 | private $dbTrxMethodTimes; |
| 64 | |
| 65 | /** @var string|null HTTP request method; null for CLI mode */ |
| 66 | private $method; |
| 67 | |
| 68 | /** @var float|null */ |
| 69 | private $wallClockOverride; |
| 70 | |
| 71 | /** Treat locks as long-running if they last longer than this many seconds */ |
| 72 | private const DB_LOCK_THRESHOLD_SEC = 3.0; |
| 73 | /** Include events in any violation logs if they last longer than this many seconds */ |
| 74 | private const EVENT_THRESHOLD_SEC = 0.25; |
| 75 | |
| 76 | /** List of event names */ |
| 77 | private const EVENT_NAMES = [ |
| 78 | 'writes', |
| 79 | 'queries', |
| 80 | 'conns', |
| 81 | 'masterConns', |
| 82 | 'maxAffected', |
| 83 | 'readQueryRows', |
| 84 | 'readQueryTime', |
| 85 | 'writeQueryTime' |
| 86 | ]; |
| 87 | |
| 88 | /** List of event names with hit counters */ |
| 89 | private const COUNTER_EVENT_NAMES = [ |
| 90 | 'writes', |
| 91 | 'queries', |
| 92 | 'conns', |
| 93 | 'masterConns' |
| 94 | ]; |
| 95 | |
| 96 | /** Key to max expected value */ |
| 97 | private const FLD_LIMIT = 0; |
| 98 | /** Key to the function that set the max expected value */ |
| 99 | private const FLD_FNAME = 1; |
| 100 | |
| 101 | /** Any type of expectation */ |
| 102 | public const EXPECTATION_ANY = 'any'; |
| 103 | /** Any expectations about replica usage never occurring */ |
| 104 | public const EXPECTATION_REPLICAS_ONLY = 'replicas-only'; |
| 105 | |
| 106 | public function __construct() { |
| 107 | $this->initPlaceholderExpectations(); |
| 108 | |
| 109 | $this->dbTrxHoldingLocks = []; |
| 110 | $this->dbTrxMethodTimes = []; |
| 111 | |
| 112 | $this->silenced = array_fill_keys( self::EVENT_NAMES, 0 ); |
| 113 | |
| 114 | $this->setLogger( new NullLogger() ); |
| 115 | $this->statsFactory = StatsFactory::newNull(); |
| 116 | } |
| 117 | |
| 118 | public function setLogger( LoggerInterface $logger ) { |
| 119 | $this->logger = $logger; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Set statsFactory |
| 124 | * |
| 125 | * @param StatsFactory $statsFactory |
| 126 | * @return void |
| 127 | */ |
| 128 | public function setStatsFactory( StatsFactory $statsFactory ) { |
| 129 | $this->statsFactory = $statsFactory; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * @param ?string $method HTTP method; null for CLI mode |
| 134 | * @return void |
| 135 | */ |
| 136 | public function setRequestMethod( ?string $method ) { |
| 137 | $this->method = $method; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Temporarily ignore expectations until the returned object goes out of scope |
| 142 | * |
| 143 | * During this time, violation of expectations will not be logged and counters |
| 144 | * for expectations (e.g. "conns") will not be incremented. |
| 145 | * |
| 146 | * This will suppress warnings about event counters which have a limit of zero. |
| 147 | * The main use case is too avoid warnings about primary connections/writes and |
| 148 | * warnings about getting any primary/replica connections at all. |
| 149 | * |
| 150 | * @param string $type Class EXPECTATION_* constant [default: TransactionProfiler::EXPECTATION_ANY] |
| 151 | * @return ScopedCallback |
| 152 | */ |
| 153 | public function silenceForScope( string $type = self::EXPECTATION_ANY ) { |
| 154 | if ( $type === self::EXPECTATION_REPLICAS_ONLY ) { |
| 155 | $events = []; |
| 156 | foreach ( [ 'writes', 'masterConns' ] as $event ) { |
| 157 | if ( $this->expect[$event][self::FLD_LIMIT] === 0 ) { |
| 158 | $events[] = $event; |
| 159 | } |
| 160 | } |
| 161 | } else { |
| 162 | $events = self::EVENT_NAMES; |
| 163 | } |
| 164 | |
| 165 | foreach ( $events as $event ) { |
| 166 | ++$this->silenced[$event]; |
| 167 | } |
| 168 | |
| 169 | return new ScopedCallback( function () use ( $events ) { |
| 170 | foreach ( $events as $event ) { |
| 171 | --$this->silenced[$event]; |
| 172 | } |
| 173 | } ); |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Set performance expectations |
| 178 | * |
| 179 | * With conflicting expectations, the most narrow ones will be used |
| 180 | * |
| 181 | * @param string $event Event name, {@see self::EVENT_NAMES} |
| 182 | * @param float|int $limit Maximum event count, event value, or total event value |
| 183 | * @param string $fname Caller |
| 184 | * @since 1.25 |
| 185 | */ |
| 186 | public function setExpectation( string $event, $limit, string $fname ) { |
| 187 | if ( !isset( $this->expect[$event] ) ) { |
| 188 | return; // obsolete/bogus expectation |
| 189 | } |
| 190 | |
| 191 | if ( $limit <= $this->expect[$event][self::FLD_LIMIT] ) { |
| 192 | // New limit is more restrictive |
| 193 | $this->expect[$event] = [ |
| 194 | self::FLD_LIMIT => $limit, |
| 195 | self::FLD_FNAME => $fname |
| 196 | ]; |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Set one or multiple performance expectations |
| 202 | * |
| 203 | * With conflicting expectations, the most narrow ones will be used |
| 204 | * |
| 205 | * Use this to initialize expectations or make them stricter mid-request |
| 206 | * |
| 207 | * @param array $expects Map of (event name => limit), {@see self::EVENT_NAMES} |
| 208 | * @param string $fname |
| 209 | * @since 1.26 |
| 210 | */ |
| 211 | public function setExpectations( array $expects, string $fname ) { |
| 212 | foreach ( $expects as $event => $value ) { |
| 213 | $this->setExpectation( $event, $value, $fname ); |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Reset all performance expectations and hit counters |
| 219 | * |
| 220 | * Use this for unit testing or before applying a totally different set of expectations |
| 221 | * for a different part of the request, such as during "post-send" (execution after HTTP |
| 222 | * response completion) |
| 223 | * |
| 224 | * @since 1.25 |
| 225 | */ |
| 226 | public function resetExpectations() { |
| 227 | $this->initPlaceholderExpectations(); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Clear all expectations and hit counters and set new performance expectations |
| 232 | * |
| 233 | * Use this to apply a totally different set of expectations for a different part |
| 234 | * of the request, such as during "post-send" (execution after HTTP response completion) |
| 235 | * |
| 236 | * @param array $expects Map of (event name => limit), {@see self::EVENT_NAMES} |
| 237 | * @param string $fname |
| 238 | * @since 1.33 |
| 239 | */ |
| 240 | public function redefineExpectations( array $expects, string $fname ) { |
| 241 | $this->initPlaceholderExpectations(); |
| 242 | $this->setExpectations( $expects, $fname ); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Mark a DB as having been connected to with a new handle |
| 247 | * |
| 248 | * Note that there can be multiple connections to a single DB. |
| 249 | * |
| 250 | * @param string $server DB server |
| 251 | * @param string|null $db DB name |
| 252 | * @param bool $isPrimaryWithReplicas If the server is the primary and there are replicas |
| 253 | */ |
| 254 | public function recordConnection( $server, $db, bool $isPrimaryWithReplicas ) { |
| 255 | // Report when too many connections happen... |
| 256 | if ( $this->pingAndCheckThreshold( 'conns' ) ) { |
| 257 | $this->reportExpectationViolated( |
| 258 | 'conns', |
| 259 | "[connect to $server ($db)]", |
| 260 | $this->hits['conns'] |
| 261 | ); |
| 262 | } |
| 263 | |
| 264 | // Report when too many primary connections happen... |
| 265 | if ( $isPrimaryWithReplicas && $this->pingAndCheckThreshold( 'masterConns' ) ) { |
| 266 | $this->reportExpectationViolated( |
| 267 | 'masterConns', |
| 268 | "[connect to $server ($db)]", |
| 269 | $this->hits['masterConns'] |
| 270 | ); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Mark a DB as in a transaction with one or more writes pending |
| 276 | * |
| 277 | * Note that there can be multiple connections to a single DB. |
| 278 | * |
| 279 | * @param string $server DB server |
| 280 | * @param string|null $db DB name |
| 281 | * @param string $id ID string of transaction |
| 282 | * @param float $startTime UNIX timestamp |
| 283 | */ |
| 284 | public function transactionWritingIn( $server, $db, string $id, float $startTime ) { |
| 285 | $name = "{$db} {$server} TRX#$id"; |
| 286 | if ( isset( $this->dbTrxHoldingLocks[$name] ) ) { |
| 287 | $this->logger->warning( "Nested transaction for '$name' - out of sync." ); |
| 288 | } |
| 289 | $this->dbTrxHoldingLocks[$name] = [ |
| 290 | 'start' => $startTime, |
| 291 | 'conns' => [], // all connections involved |
| 292 | ]; |
| 293 | $this->dbTrxMethodTimes[$name] = []; |
| 294 | |
| 295 | foreach ( $this->dbTrxHoldingLocks as $name => &$info ) { |
| 296 | // Track all DBs in transactions for this transaction |
| 297 | $info['conns'][$name] = 1; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * Register the name and time of a method for slow DB trx detection |
| 303 | * |
| 304 | * This assumes that all queries are synchronous (non-overlapping) |
| 305 | * |
| 306 | * @param string|GeneralizedSql $query Function name or generalized SQL |
| 307 | * @param float $sTime Starting UNIX wall time |
| 308 | * @param bool $isWrite Whether this is a write query |
| 309 | * @param int|null $rowCount Number of affected/read rows |
| 310 | * @param string $trxId Transaction id |
| 311 | * @param string|null $serverName db host name like db1234 |
| 312 | */ |
| 313 | public function recordQueryCompletion( |
| 314 | $query, |
| 315 | float $sTime, |
| 316 | bool $isWrite, |
| 317 | ?int $rowCount, |
| 318 | string $trxId, |
| 319 | ?string $serverName = null |
| 320 | ) { |
| 321 | $eTime = $this->getCurrentTime(); |
| 322 | $elapsed = ( $eTime - $sTime ); |
| 323 | |
| 324 | if ( $isWrite && $this->isAboveThreshold( $rowCount, 'maxAffected' ) ) { |
| 325 | $this->reportExpectationViolated( 'maxAffected', $query, $rowCount, $trxId, $serverName ); |
| 326 | } elseif ( !$isWrite && $this->isAboveThreshold( $rowCount, 'readQueryRows' ) ) { |
| 327 | $this->reportExpectationViolated( 'readQueryRows', $query, $rowCount, $trxId, $serverName ); |
| 328 | } |
| 329 | |
| 330 | // Report when too many writes/queries happen... |
| 331 | if ( $this->pingAndCheckThreshold( 'queries' ) ) { |
| 332 | $this->reportExpectationViolated( 'queries', $query, $this->hits['queries'], $trxId, $serverName ); |
| 333 | } |
| 334 | if ( $isWrite && $this->pingAndCheckThreshold( 'writes' ) ) { |
| 335 | $this->reportExpectationViolated( 'writes', $query, $this->hits['writes'], $trxId, $serverName ); |
| 336 | } |
| 337 | // Report slow queries... |
| 338 | if ( !$isWrite && $this->isAboveThreshold( $elapsed, 'readQueryTime' ) ) { |
| 339 | $this->reportExpectationViolated( 'readQueryTime', $query, $elapsed, $trxId, $serverName ); |
| 340 | } |
| 341 | if ( $isWrite && $this->isAboveThreshold( $elapsed, 'writeQueryTime' ) ) { |
| 342 | $this->reportExpectationViolated( 'writeQueryTime', $query, $elapsed, $trxId, $serverName ); |
| 343 | } |
| 344 | |
| 345 | if ( !$this->dbTrxHoldingLocks ) { |
| 346 | // Short-circuit |
| 347 | return; |
| 348 | } elseif ( !$isWrite && $elapsed < self::EVENT_THRESHOLD_SEC ) { |
| 349 | // Not an important query nor slow enough |
| 350 | return; |
| 351 | } |
| 352 | |
| 353 | foreach ( $this->dbTrxHoldingLocks as $name => $info ) { |
| 354 | $lastQuery = end( $this->dbTrxMethodTimes[$name] ); |
| 355 | if ( $lastQuery ) { |
| 356 | // Additional query in the trx... |
| 357 | $lastEnd = $lastQuery[2]; |
| 358 | if ( $sTime >= $lastEnd ) { |
| 359 | if ( ( $sTime - $lastEnd ) > self::EVENT_THRESHOLD_SEC ) { |
| 360 | // Add an entry representing the time spent doing non-queries |
| 361 | $this->dbTrxMethodTimes[$name][] = [ '...delay...', $lastEnd, $sTime ]; |
| 362 | } |
| 363 | $this->dbTrxMethodTimes[$name][] = [ $query, $sTime, $eTime ]; |
| 364 | } |
| 365 | } else { |
| 366 | // First query in the trx... |
| 367 | if ( $sTime >= $info['start'] ) { |
| 368 | $this->dbTrxMethodTimes[$name][] = [ $query, $sTime, $eTime ]; |
| 369 | } |
| 370 | } |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * Mark a DB as no longer in a transaction |
| 376 | * |
| 377 | * This will check if locks are possibly held for longer than |
| 378 | * needed and log any affected transactions to a special DB log. |
| 379 | * Note that there can be multiple connections to a single DB. |
| 380 | * |
| 381 | * @param string $server DB server |
| 382 | * @param string|null $db DB name |
| 383 | * @param string $id ID string of transaction |
| 384 | * @param float $writeTime Time spent in write queries |
| 385 | * @param int $affected Number of rows affected by writes |
| 386 | */ |
| 387 | public function transactionWritingOut( |
| 388 | $server, |
| 389 | $db, |
| 390 | string $id, |
| 391 | float $writeTime, |
| 392 | int $affected |
| 393 | ) { |
| 394 | // Must match $name in transactionWritingIn() |
| 395 | $name = "{$db} {$server} TRX#$id"; |
| 396 | if ( !isset( $this->dbTrxMethodTimes[$name] ) ) { |
| 397 | $this->logger->warning( "Detected no transaction for '$name' - out of sync." ); |
| 398 | return; |
| 399 | } |
| 400 | |
| 401 | $slow = false; |
| 402 | |
| 403 | // Warn if too much time was spend writing... |
| 404 | if ( $this->isAboveThreshold( $writeTime, 'writeQueryTime' ) ) { |
| 405 | $this->reportExpectationViolated( |
| 406 | 'writeQueryTime', |
| 407 | "[transaction writes to {$db} at {$server}]", |
| 408 | $writeTime, |
| 409 | $id |
| 410 | ); |
| 411 | $slow = true; |
| 412 | } |
| 413 | // Warn if too many rows were changed... |
| 414 | if ( $this->isAboveThreshold( $affected, 'maxAffected' ) ) { |
| 415 | $this->reportExpectationViolated( |
| 416 | 'maxAffected', |
| 417 | "[transaction writes to {$db} at {$server}]", |
| 418 | $affected, |
| 419 | $id |
| 420 | ); |
| 421 | } |
| 422 | // Fill in the last non-query period... |
| 423 | $lastQuery = end( $this->dbTrxMethodTimes[$name] ); |
| 424 | if ( $lastQuery ) { |
| 425 | $now = $this->getCurrentTime(); |
| 426 | $lastEnd = $lastQuery[2]; |
| 427 | if ( ( $now - $lastEnd ) > self::EVENT_THRESHOLD_SEC ) { |
| 428 | $this->dbTrxMethodTimes[$name][] = [ '...delay...', $lastEnd, $now ]; |
| 429 | } |
| 430 | } |
| 431 | // Check for any slow queries or non-query periods... |
| 432 | foreach ( $this->dbTrxMethodTimes[$name] as $info ) { |
| 433 | $elapsed = ( $info[2] - $info[1] ); |
| 434 | if ( $elapsed >= self::DB_LOCK_THRESHOLD_SEC ) { |
| 435 | $slow = true; |
| 436 | break; |
| 437 | } |
| 438 | } |
| 439 | if ( $slow ) { |
| 440 | $trace = ''; |
| 441 | foreach ( $this->dbTrxMethodTimes[$name] as $i => [ $query, $sTime, $end ] ) { |
| 442 | $trace .= sprintf( |
| 443 | "%-2d %.3fs %s\n", $i, ( $end - $sTime ), $this->getGeneralizedSql( $query ) ); |
| 444 | } |
| 445 | $this->logger->warning( "Suboptimal transaction [{dbs}]:\n{trace}", [ |
| 446 | 'dbs' => implode( ', ', array_keys( $this->dbTrxHoldingLocks[$name]['conns'] ) ), |
| 447 | 'trace' => mb_substr( $trace, 0, 2000 ) |
| 448 | ] ); |
| 449 | } |
| 450 | unset( $this->dbTrxHoldingLocks[$name] ); |
| 451 | unset( $this->dbTrxMethodTimes[$name] ); |
| 452 | } |
| 453 | |
| 454 | private function initPlaceholderExpectations() { |
| 455 | $this->expect = array_fill_keys( |
| 456 | self::EVENT_NAMES, |
| 457 | [ self::FLD_LIMIT => INF, self::FLD_FNAME => null ] |
| 458 | ); |
| 459 | |
| 460 | $this->hits = array_fill_keys( self::COUNTER_EVENT_NAMES, 0 ); |
| 461 | $this->violations = array_fill_keys( self::EVENT_NAMES, 0 ); |
| 462 | } |
| 463 | |
| 464 | /** |
| 465 | * @param float|int $value |
| 466 | * @param string $event |
| 467 | * @return bool |
| 468 | */ |
| 469 | private function isAboveThreshold( $value, string $event ) { |
| 470 | if ( $this->silenced[$event] > 0 ) { |
| 471 | return false; |
| 472 | } |
| 473 | |
| 474 | return ( $value > $this->expect[$event][self::FLD_LIMIT] ); |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * @param string $event |
| 479 | * @return bool |
| 480 | */ |
| 481 | private function pingAndCheckThreshold( string $event ) { |
| 482 | if ( $this->silenced[$event] > 0 ) { |
| 483 | return false; |
| 484 | } |
| 485 | |
| 486 | $newValue = ++$this->hits[$event]; |
| 487 | $limit = $this->expect[$event][self::FLD_LIMIT]; |
| 488 | |
| 489 | return ( $newValue > $limit ); |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * @param string $event |
| 494 | * @param string|GeneralizedSql $query |
| 495 | * @param float|int $actual |
| 496 | * @param string|null $trxId Transaction id |
| 497 | * @param string|null $serverName db host name like db1234 |
| 498 | */ |
| 499 | private function reportExpectationViolated( |
| 500 | $event, |
| 501 | $query, |
| 502 | $actual, |
| 503 | ?string $trxId = null, |
| 504 | ?string $serverName = null |
| 505 | ) { |
| 506 | $violations = ++$this->violations[$event]; |
| 507 | // First violation; check if this is a web request |
| 508 | if ( $violations === 1 && $this->method !== null ) { |
| 509 | $this->statsFactory->getCounter( 'rdbms_trxprofiler_warnings_total' ) |
| 510 | ->setLabel( 'event', $event ) |
| 511 | ->setLabel( 'method', $this->method ) |
| 512 | ->copyToStatsdAt( "rdbms_trxprofiler_warnings.$event.{$this->method}" ) |
| 513 | ->increment(); |
| 514 | } |
| 515 | |
| 516 | $max = $this->expect[$event][self::FLD_LIMIT]; |
| 517 | $by = $this->expect[$event][self::FLD_FNAME]; |
| 518 | |
| 519 | $message = "Expectation ($event <= $max) by $by not met (actual: {actualSeconds})"; |
| 520 | if ( $trxId ) { |
| 521 | $message .= ' in trx #{trxId}'; |
| 522 | } |
| 523 | $message .= ":\n{query}\n"; |
| 524 | |
| 525 | $this->logger->warning( |
| 526 | $message, |
| 527 | [ |
| 528 | 'db_log_category' => 'performance', |
| 529 | 'measure' => $event, |
| 530 | 'maxSeconds' => $max, |
| 531 | 'by' => $by, |
| 532 | 'actualSeconds' => $actual, |
| 533 | 'query' => $this->getGeneralizedSql( $query ), |
| 534 | 'exception' => new RuntimeException(), |
| 535 | 'trxId' => $trxId, |
| 536 | // Avoid truncated JSON in Logstash (T349140) |
| 537 | 'fullQuery' => mb_substr( $this->getRawSql( $query ), 0, 2000 ), |
| 538 | 'dbHost' => $serverName |
| 539 | ] |
| 540 | ); |
| 541 | } |
| 542 | |
| 543 | /** |
| 544 | * @param GeneralizedSql|string $query |
| 545 | * @return string |
| 546 | */ |
| 547 | private function getGeneralizedSql( $query ) { |
| 548 | return $query instanceof GeneralizedSql ? $query->stringify() : $query; |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * @param GeneralizedSql|string $query |
| 553 | * @return string |
| 554 | */ |
| 555 | private function getRawSql( $query ) { |
| 556 | return $query instanceof GeneralizedSql ? $query->getRawSql() : $query; |
| 557 | } |
| 558 | |
| 559 | /** |
| 560 | * @return float UNIX timestamp |
| 561 | * @codeCoverageIgnore |
| 562 | */ |
| 563 | private function getCurrentTime() { |
| 564 | return $this->wallClockOverride ?: microtime( true ); |
| 565 | } |
| 566 | |
| 567 | /** |
| 568 | * @param float|null &$time Mock UNIX timestamp for testing |
| 569 | * @codeCoverageIgnore |
| 570 | */ |
| 571 | public function setMockTime( &$time ) { |
| 572 | $this->wallClockOverride =& $time; |
| 573 | } |
| 574 | } |