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