includes/libs/rdbms/database/DBConnRef.php

   1 <?php
   2
   3 namespace Wikimedia\Rdbms;
   4
   5 use InvalidArgumentException;
   6
   7 /**
   8  * Helper class to handle automatically marking connections as reusable (via RAII pattern)
   9  * as well handling deferring the actual network connection until the handle is used
  10  *
  11  * @ingroup Database
  12  * @since 1.22
  13  */
  14 class DBConnRef implements IDatabase {
  15         /** @var ILoadBalancer */
  16         private $lb;
  17         /** @var Database|null Live connection handle */
  18         private $conn;
  19         /** @var array|null N-tuple of (server index, group, DatabaseDomain|string) */
  20         private $params;
  21         /** @var int One of DB_MASTER/DB_REPLICA */
  22         private $role;
  23
  24         const FLD_INDEX = 0;
  25         const FLD_GROUP = 1;
  26         const FLD_DOMAIN = 2;
  27         const FLD_FLAGS = 3;
  28
  29         /**
  30          * @param ILoadBalancer $lb Connection manager for $conn
  31          * @param Database|array $conn Database or (server index, query groups, domain, flags)
  32          * @param int $role The type of connection asked for; one of DB_MASTER/DB_REPLICA
  33          * @internal This method should not be called outside of LoadBalancer
  34          */
  35         public function __construct( ILoadBalancer $lb, $conn, $role ) {
  36                 $this->lb = $lb;
  37                 $this->role = $role;
  38                 if ( $conn instanceof Database ) {
  39                         $this->conn = $conn; // live handle
  40                 } elseif ( is_array( $conn ) && count( $conn ) >= 4 && $conn[self::FLD_DOMAIN] !== false ) {
  41                         $this->params = $conn;
  42                 } else {
  43                         throw new InvalidArgumentException( "Missing lazy connection arguments." );
  44                 }
  45         }
  46
  47         function __call( $name, array $arguments ) {
  48                 if ( $this->conn === null ) {
  49                         list( $db, $groups, $wiki, $flags ) = $this->params;
  50                         $this->conn = $this->lb->getConnection( $db, $groups, $wiki, $flags );
  51                 }
  52
  53                 return $this->conn->$name( ...$arguments );
  54         }
  55
  56         /**
  57          * @return int DB_MASTER when this *requires* the master DB, otherwise DB_REPLICA
  58          * @since 1.33
  59          */
  60         public function getReferenceRole() {
  61                 return $this->role;
  62         }
  63
  64         public function getServerInfo() {
  65                 return $this->__call( __FUNCTION__, func_get_args() );
  66         }
  67
  68         public function bufferResults( $buffer = null ) {
  69                 return $this->__call( __FUNCTION__, func_get_args() );
  70         }
  71
  72         public function trxLevel() {
  73                 return $this->__call( __FUNCTION__, func_get_args() );
  74         }
  75
  76         public function trxTimestamp() {
  77                 return $this->__call( __FUNCTION__, func_get_args() );
  78         }
  79
  80         public function explicitTrxActive() {
  81                 return $this->__call( __FUNCTION__, func_get_args() );
  82         }
  83
  84         public function assertNoOpenTransactions() {
  85                 return $this->__call( __FUNCTION__, func_get_args() );
  86         }
  87
  88         public function tablePrefix( $prefix = null ) {
  89                 if ( $this->conn === null && $prefix === null ) {
  90                         $domain = DatabaseDomain::newFromId( $this->params[self::FLD_DOMAIN] );
  91                         // Avoid triggering a database connection
  92                         return $domain->getTablePrefix();
  93                 } elseif ( $this->conn !== null && $prefix === null ) {
  94                         // This will just return the prefix
  95                         return $this->__call( __FUNCTION__, func_get_args() );
  96                 }
  97                 // Disallow things that might confuse the LoadBalancer tracking
  98                 throw new DBUnexpectedError( $this, "Database selection is disallowed to enable reuse." );
  99         }
 100
 101         public function dbSchema( $schema = null ) {
 102                 if ( $this->conn === null && $schema === null ) {
 103                         $domain = DatabaseDomain::newFromId( $this->params[self::FLD_DOMAIN] );
 104                         // Avoid triggering a database connection
 105                         return $domain->getSchema();
 106                 } elseif ( $this->conn !== null && $schema === null ) {
 107                         // This will just return the schema
 108                         return $this->__call( __FUNCTION__, func_get_args() );
 109                 }
 110                 // Disallow things that might confuse the LoadBalancer tracking
 111                 throw new DBUnexpectedError( $this, "Database selection is disallowed to enable reuse." );
 112         }
 113
 114         public function getLBInfo( $name = null ) {
 115                 return $this->__call( __FUNCTION__, func_get_args() );
 116         }
 117
 118         public function setLBInfo( $name, $value = null ) {
 119                 // Disallow things that might confuse the LoadBalancer tracking
 120                 throw new DBUnexpectedError( $this, "Changing LB info is disallowed to enable reuse." );
 121         }
 122
 123         public function setLazyMasterHandle( IDatabase $conn ) {
 124                 // Disallow things that might confuse the LoadBalancer tracking
 125                 throw new DBUnexpectedError( $this, "Database injection is disallowed to enable reuse." );
 126         }
 127
 128         public function implicitGroupby() {
 129                 return $this->__call( __FUNCTION__, func_get_args() );
 130         }
 131
 132         public function implicitOrderby() {
 133                 return $this->__call( __FUNCTION__, func_get_args() );
 134         }
 135
 136         public function lastQuery() {
 137                 return $this->__call( __FUNCTION__, func_get_args() );
 138         }
 139
 140         public function doneWrites() {
 141                 return $this->__call( __FUNCTION__, func_get_args() );
 142         }
 143
 144         public function lastDoneWrites() {
 145                 return $this->__call( __FUNCTION__, func_get_args() );
 146         }
 147
 148         public function writesPending() {
 149                 return $this->__call( __FUNCTION__, func_get_args() );
 150         }
 151
 152         public function preCommitCallbacksPending() {
 153                 return $this->__call( __FUNCTION__, func_get_args() );
 154         }
 155
 156         public function writesOrCallbacksPending() {
 157                 return $this->__call( __FUNCTION__, func_get_args() );
 158         }
 159
 160         public function pendingWriteQueryDuration( $type = self::ESTIMATE_TOTAL ) {
 161                 return $this->__call( __FUNCTION__, func_get_args() );
 162         }
 163
 164         public function pendingWriteCallers() {
 165                 return $this->__call( __FUNCTION__, func_get_args() );
 166         }
 167
 168         public function pendingWriteRowsAffected() {
 169                 return $this->__call( __FUNCTION__, func_get_args() );
 170         }
 171
 172         public function isOpen() {
 173                 return $this->__call( __FUNCTION__, func_get_args() );
 174         }
 175
 176         public function setFlag( $flag, $remember = self::REMEMBER_NOTHING ) {
 177                 return $this->__call( __FUNCTION__, func_get_args() );
 178         }
 179
 180         public function clearFlag( $flag, $remember = self::REMEMBER_NOTHING ) {
 181                 return $this->__call( __FUNCTION__, func_get_args() );
 182         }
 183
 184         public function restoreFlags( $state = self::RESTORE_PRIOR ) {
 185                 return $this->__call( __FUNCTION__, func_get_args() );
 186         }
 187
 188         public function getFlag( $flag ) {
 189                 return $this->__call( __FUNCTION__, func_get_args() );
 190         }
 191
 192         public function getProperty( $name ) {
 193                 return $this->__call( __FUNCTION__, func_get_args() );
 194         }
 195
 196         public function getDomainID() {
 197                 if ( $this->conn === null ) {
 198                         $domain = $this->params[self::FLD_DOMAIN];
 199                         // Avoid triggering a database connection
 200                         return $domain instanceof DatabaseDomain ? $domain->getId() : $domain;
 201                 }
 202
 203                 return $this->__call( __FUNCTION__, func_get_args() );
 204         }
 205
 206         /**
 207          * @codeCoverageIgnore
 208          */
 209         public function getWikiID() {
 210                 return $this->getDomainID();
 211         }
 212
 213         public function getType() {
 214                 return $this->__call( __FUNCTION__, func_get_args() );
 215         }
 216
 217         public function fetchObject( $res ) {
 218                 return $this->__call( __FUNCTION__, func_get_args() );
 219         }
 220
 221         public function fetchRow( $res ) {
 222                 return $this->__call( __FUNCTION__, func_get_args() );
 223         }
 224
 225         public function numRows( $res ) {
 226                 return $this->__call( __FUNCTION__, func_get_args() );
 227         }
 228
 229         public function numFields( $res ) {
 230                 return $this->__call( __FUNCTION__, func_get_args() );
 231         }
 232
 233         public function fieldName( $res, $n ) {
 234                 return $this->__call( __FUNCTION__, func_get_args() );
 235         }
 236
 237         public function insertId() {
 238                 return $this->__call( __FUNCTION__, func_get_args() );
 239         }
 240
 241         public function dataSeek( $res, $row ) {
 242                 return $this->__call( __FUNCTION__, func_get_args() );
 243         }
 244
 245         public function lastErrno() {
 246                 return $this->__call( __FUNCTION__, func_get_args() );
 247         }
 248
 249         public function lastError() {
 250                 return $this->__call( __FUNCTION__, func_get_args() );
 251         }
 252
 253         public function affectedRows() {
 254                 return $this->__call( __FUNCTION__, func_get_args() );
 255         }
 256
 257         public function getSoftwareLink() {
 258                 return $this->__call( __FUNCTION__, func_get_args() );
 259         }
 260
 261         public function getServerVersion() {
 262                 return $this->__call( __FUNCTION__, func_get_args() );
 263         }
 264
 265         public function close() {
 266                 throw new DBUnexpectedError( $this->conn, 'Cannot close shared connection.' );
 267         }
 268
 269         public function query( $sql, $fname = __METHOD__, $flags = 0 ) {
 270                 if ( $this->role !== ILoadBalancer::DB_MASTER ) {
 271                         $flags |= IDatabase::QUERY_REPLICA_ROLE;
 272                 }
 273
 274                 return $this->__call( __FUNCTION__, [ $sql, $fname, $flags ] );
 275         }
 276
 277         public function freeResult( $res ) {
 278                 return $this->__call( __FUNCTION__, func_get_args() );
 279         }
 280
 281         public function selectField(
 282                 $table, $var, $cond = '', $fname = __METHOD__, $options = [], $join_conds = []
 283         ) {
 284                 return $this->__call( __FUNCTION__, func_get_args() );
 285         }
 286
 287         public function selectFieldValues(
 288                 $table, $var, $cond = '', $fname = __METHOD__, $options = [], $join_conds = []
 289         ) {
 290                 return $this->__call( __FUNCTION__, func_get_args() );
 291         }
 292
 293         public function select(
 294                 $table, $vars, $conds = '', $fname = __METHOD__,
 295                 $options = [], $join_conds = []
 296         ) {
 297                 return $this->__call( __FUNCTION__, func_get_args() );
 298         }
 299
 300         public function selectSQLText(
 301                 $table, $vars, $conds = '', $fname = __METHOD__,
 302                 $options = [], $join_conds = []
 303         ) {
 304                 return $this->__call( __FUNCTION__, func_get_args() );
 305         }
 306
 307         public function selectRow(
 308                 $table, $vars, $conds, $fname = __METHOD__,
 309                 $options = [], $join_conds = []
 310         ) {
 311                 return $this->__call( __FUNCTION__, func_get_args() );
 312         }
 313
 314         public function estimateRowCount(
 315                 $table, $vars = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
 316         ) {
 317                 return $this->__call( __FUNCTION__, func_get_args() );
 318         }
 319
 320         public function selectRowCount(
 321                 $tables, $vars = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
 322         ) {
 323                 return $this->__call( __FUNCTION__, func_get_args() );
 324         }
 325
 326         public function lockForUpdate(
 327                 $table, $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
 328         ) {
 329                 $this->assertRoleAllowsWrites();
 330
 331                 return $this->__call( __FUNCTION__, func_get_args() );
 332         }
 333
 334         public function fieldExists( $table, $field, $fname = __METHOD__ ) {
 335                 return $this->__call( __FUNCTION__, func_get_args() );
 336         }
 337
 338         public function indexExists( $table, $index, $fname = __METHOD__ ) {
 339                 return $this->__call( __FUNCTION__, func_get_args() );
 340         }
 341
 342         public function tableExists( $table, $fname = __METHOD__ ) {
 343                 return $this->__call( __FUNCTION__, func_get_args() );
 344         }
 345
 346         public function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 347                 $this->assertRoleAllowsWrites();
 348
 349                 return $this->__call( __FUNCTION__, func_get_args() );
 350         }
 351
 352         public function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
 353                 $this->assertRoleAllowsWrites();
 354
 355                 return $this->__call( __FUNCTION__, func_get_args() );
 356         }
 357
 358         public function makeList( $a, $mode = self::LIST_COMMA ) {
 359                 return $this->__call( __FUNCTION__, func_get_args() );
 360         }
 361
 362         public function makeWhereFrom2d( $data, $baseKey, $subKey ) {
 363                 return $this->__call( __FUNCTION__, func_get_args() );
 364         }
 365
 366         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 367                 return $this->__call( __FUNCTION__, func_get_args() );
 368         }
 369
 370         public function bitNot( $field ) {
 371                 return $this->__call( __FUNCTION__, func_get_args() );
 372         }
 373
 374         public function bitAnd( $fieldLeft, $fieldRight ) {
 375                 return $this->__call( __FUNCTION__, func_get_args() );
 376         }
 377
 378         public function bitOr( $fieldLeft, $fieldRight ) {
 379                 return $this->__call( __FUNCTION__, func_get_args() );
 380         }
 381
 382         public function buildConcat( $stringList ) {
 383                 return $this->__call( __FUNCTION__, func_get_args() );
 384         }
 385
 386         public function buildGroupConcatField(
 387                 $delim, $table, $field, $conds = '', $join_conds = []
 388         ) {
 389                 return $this->__call( __FUNCTION__, func_get_args() );
 390         }
 391
 392         public function buildSubstring( $input, $startPosition, $length = null ) {
 393                 return $this->__call( __FUNCTION__, func_get_args() );
 394         }
 395
 396         public function buildStringCast( $field ) {
 397                 return $this->__call( __FUNCTION__, func_get_args() );
 398         }
 399
 400         public function buildIntegerCast( $field ) {
 401                 return $this->__call( __FUNCTION__, func_get_args() );
 402         }
 403
 404         public function buildSelectSubquery(
 405                 $table, $vars, $conds = '', $fname = __METHOD__,
 406                 $options = [], $join_conds = []
 407         ) {
 408                 return $this->__call( __FUNCTION__, func_get_args() );
 409         }
 410
 411         public function databasesAreIndependent() {
 412                 return $this->__call( __FUNCTION__, func_get_args() );
 413         }
 414
 415         public function selectDB( $db ) {
 416                 // Disallow things that might confuse the LoadBalancer tracking
 417                 throw new DBUnexpectedError( $this, "Database selection is disallowed to enable reuse." );
 418         }
 419
 420         public function selectDomain( $domain ) {
 421                 // Disallow things that might confuse the LoadBalancer tracking
 422                 throw new DBUnexpectedError( $this, "Database selection is disallowed to enable reuse." );
 423         }
 424
 425         public function getDBname() {
 426                 if ( $this->conn === null ) {
 427                         $domain = DatabaseDomain::newFromId( $this->params[self::FLD_DOMAIN] );
 428                         // Avoid triggering a database connection
 429                         return $domain->getDatabase();
 430                 }
 431
 432                 return $this->__call( __FUNCTION__, func_get_args() );
 433         }
 434
 435         public function getServer() {
 436                 return $this->__call( __FUNCTION__, func_get_args() );
 437         }
 438
 439         public function addQuotes( $s ) {
 440                 return $this->__call( __FUNCTION__, func_get_args() );
 441         }
 442
 443         public function addIdentifierQuotes( $s ) {
 444                 return $this->__call( __FUNCTION__, func_get_args() );
 445         }
 446
 447         public function buildLike() {
 448                 return $this->__call( __FUNCTION__, func_get_args() );
 449         }
 450
 451         public function anyChar() {
 452                 return $this->__call( __FUNCTION__, func_get_args() );
 453         }
 454
 455         public function anyString() {
 456                 return $this->__call( __FUNCTION__, func_get_args() );
 457         }
 458
 459         public function nextSequenceValue( $seqName ) {
 460                 $this->assertRoleAllowsWrites();
 461
 462                 return $this->__call( __FUNCTION__, func_get_args() );
 463         }
 464
 465         public function replace( $table, $uniqueIndexes, $rows, $fname = __METHOD__ ) {
 466                 $this->assertRoleAllowsWrites();
 467
 468                 return $this->__call( __FUNCTION__, func_get_args() );
 469         }
 470
 471         public function upsert(
 472                 $table, array $rows, $uniqueIndexes, array $set, $fname = __METHOD__
 473         ) {
 474                 $this->assertRoleAllowsWrites();
 475
 476                 return $this->__call( __FUNCTION__, func_get_args() );
 477         }
 478
 479         public function deleteJoin(
 480                 $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = __METHOD__
 481         ) {
 482                 $this->assertRoleAllowsWrites();
 483
 484                 return $this->__call( __FUNCTION__, func_get_args() );
 485         }
 486
 487         public function delete( $table, $conds, $fname = __METHOD__ ) {
 488                 $this->assertRoleAllowsWrites();
 489
 490                 return $this->__call( __FUNCTION__, func_get_args() );
 491         }
 492
 493         public function insertSelect(
 494                 $destTable, $srcTable, $varMap, $conds,
 495                 $fname = __METHOD__, $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 496         ) {
 497                 $this->assertRoleAllowsWrites();
 498
 499                 return $this->__call( __FUNCTION__, func_get_args() );
 500         }
 501
 502         public function unionSupportsOrderAndLimit() {
 503                 return $this->__call( __FUNCTION__, func_get_args() );
 504         }
 505
 506         public function unionQueries( $sqls, $all ) {
 507                 return $this->__call( __FUNCTION__, func_get_args() );
 508         }
 509
 510         public function unionConditionPermutations(
 511                 $table, $vars, array $permute_conds, $extra_conds = '', $fname = __METHOD__,
 512                 $options = [], $join_conds = []
 513         ) {
 514                 return $this->__call( __FUNCTION__, func_get_args() );
 515         }
 516
 517         public function conditional( $cond, $trueVal, $falseVal ) {
 518                 return $this->__call( __FUNCTION__, func_get_args() );
 519         }
 520
 521         public function strreplace( $orig, $old, $new ) {
 522                 return $this->__call( __FUNCTION__, func_get_args() );
 523         }
 524
 525         public function getServerUptime() {
 526                 return $this->__call( __FUNCTION__, func_get_args() );
 527         }
 528
 529         public function wasDeadlock() {
 530                 return $this->__call( __FUNCTION__, func_get_args() );
 531         }
 532
 533         public function wasLockTimeout() {
 534                 return $this->__call( __FUNCTION__, func_get_args() );
 535         }
 536
 537         public function wasConnectionLoss() {
 538                 return $this->__call( __FUNCTION__, func_get_args() );
 539         }
 540
 541         public function wasReadOnlyError() {
 542                 return $this->__call( __FUNCTION__, func_get_args() );
 543         }
 544
 545         public function wasErrorReissuable() {
 546                 return $this->__call( __FUNCTION__, func_get_args() );
 547         }
 548
 549         public function masterPosWait( DBMasterPos $pos, $timeout ) {
 550                 return $this->__call( __FUNCTION__, func_get_args() );
 551         }
 552
 553         public function getReplicaPos() {
 554                 return $this->__call( __FUNCTION__, func_get_args() );
 555         }
 556
 557         public function getMasterPos() {
 558                 return $this->__call( __FUNCTION__, func_get_args() );
 559         }
 560
 561         public function serverIsReadOnly() {
 562                 return $this->__call( __FUNCTION__, func_get_args() );
 563         }
 564
 565         public function onTransactionResolution( callable $callback, $fname = __METHOD__ ) {
 566                 // DB_REPLICA role: caller might want to refresh cache after a REPEATABLE-READ snapshot
 567                 return $this->__call( __FUNCTION__, func_get_args() );
 568         }
 569
 570         public function onTransactionCommitOrIdle( callable $callback, $fname = __METHOD__ ) {
 571                 // DB_REPLICA role: caller might want to refresh cache after a REPEATABLE-READ snapshot
 572                 return $this->__call( __FUNCTION__, func_get_args() );
 573         }
 574
 575         public function onTransactionIdle( callable $callback, $fname = __METHOD__ ) {
 576                 return $this->onTransactionCommitOrIdle( $callback, $fname );
 577         }
 578
 579         public function onTransactionPreCommitOrIdle( callable $callback, $fname = __METHOD__ ) {
 580                 // DB_REPLICA role: caller might want to refresh cache after a cache mutex is released
 581                 return $this->__call( __FUNCTION__, func_get_args() );
 582         }
 583
 584         public function setTransactionListener( $name, callable $callback = null ) {
 585                 return $this->__call( __FUNCTION__, func_get_args() );
 586         }
 587
 588         public function startAtomic(
 589                 $fname = __METHOD__, $cancelable = IDatabase::ATOMIC_NOT_CANCELABLE
 590         ) {
 591                 // Don't call assertRoleAllowsWrites(); caller might want a REPEATABLE-READ snapshot
 592                 return $this->__call( __FUNCTION__, func_get_args() );
 593         }
 594
 595         public function endAtomic( $fname = __METHOD__ ) {
 596                 // Don't call assertRoleAllowsWrites(); caller might want a REPEATABLE-READ snapshot
 597                 return $this->__call( __FUNCTION__, func_get_args() );
 598         }
 599
 600         public function cancelAtomic( $fname = __METHOD__, AtomicSectionIdentifier $sectionId = null ) {
 601                 // Don't call assertRoleAllowsWrites(); caller might want a REPEATABLE-READ snapshot
 602                 return $this->__call( __FUNCTION__, func_get_args() );
 603         }
 604
 605         public function doAtomicSection(
 606                 $fname, callable $callback, $cancelable = self::ATOMIC_NOT_CANCELABLE
 607         ) {
 608                 // Don't call assertRoleAllowsWrites(); caller might want a REPEATABLE-READ snapshot
 609                 return $this->__call( __FUNCTION__, func_get_args() );
 610         }
 611
 612         public function begin( $fname = __METHOD__, $mode = IDatabase::TRANSACTION_EXPLICIT ) {
 613                 return $this->__call( __FUNCTION__, func_get_args() );
 614         }
 615
 616         public function commit( $fname = __METHOD__, $flush = '' ) {
 617                 return $this->__call( __FUNCTION__, func_get_args() );
 618         }
 619
 620         public function rollback( $fname = __METHOD__, $flush = '' ) {
 621                 return $this->__call( __FUNCTION__, func_get_args() );
 622         }
 623
 624         public function flushSnapshot( $fname = __METHOD__ ) {
 625                 return $this->__call( __FUNCTION__, func_get_args() );
 626         }
 627
 628         public function timestamp( $ts = 0 ) {
 629                 return $this->__call( __FUNCTION__, func_get_args() );
 630         }
 631
 632         public function timestampOrNull( $ts = null ) {
 633                 return $this->__call( __FUNCTION__, func_get_args() );
 634         }
 635
 636         public function ping( &$rtt = null ) {
 637                 return func_num_args()
 638                         ? $this->__call( __FUNCTION__, [ &$rtt ] )
 639                         : $this->__call( __FUNCTION__, [] ); // method cares about null vs missing
 640         }
 641
 642         public function getLag() {
 643                 return $this->__call( __FUNCTION__, func_get_args() );
 644         }
 645
 646         public function getSessionLagStatus() {
 647                 return $this->__call( __FUNCTION__, func_get_args() );
 648         }
 649
 650         public function maxListLen() {
 651                 return $this->__call( __FUNCTION__, func_get_args() );
 652         }
 653
 654         public function encodeBlob( $b ) {
 655                 return $this->__call( __FUNCTION__, func_get_args() );
 656         }
 657
 658         public function decodeBlob( $b ) {
 659                 return $this->__call( __FUNCTION__, func_get_args() );
 660         }
 661
 662         public function setSessionOptions( array $options ) {
 663                 return $this->__call( __FUNCTION__, func_get_args() );
 664         }
 665
 666         public function setSchemaVars( $vars ) {
 667                 return $this->__call( __FUNCTION__, func_get_args() );
 668         }
 669
 670         public function lockIsFree( $lockName, $method ) {
 671                 $this->assertRoleAllowsWrites();
 672
 673                 return $this->__call( __FUNCTION__, func_get_args() );
 674         }
 675
 676         public function lock( $lockName, $method, $timeout = 5 ) {
 677                 $this->assertRoleAllowsWrites();
 678
 679                 return $this->__call( __FUNCTION__, func_get_args() );
 680         }
 681
 682         public function unlock( $lockName, $method ) {
 683                 $this->assertRoleAllowsWrites();
 684
 685                 return $this->__call( __FUNCTION__, func_get_args() );
 686         }
 687
 688         public function getScopedLockAndFlush( $lockKey, $fname, $timeout ) {
 689                 $this->assertRoleAllowsWrites();
 690
 691                 return $this->__call( __FUNCTION__, func_get_args() );
 692         }
 693
 694         public function namedLocksEnqueue() {
 695                 return $this->__call( __FUNCTION__, func_get_args() );
 696         }
 697
 698         public function getInfinity() {
 699                 return $this->__call( __FUNCTION__, func_get_args() );
 700         }
 701
 702         public function encodeExpiry( $expiry ) {
 703                 return $this->__call( __FUNCTION__, func_get_args() );
 704         }
 705
 706         public function decodeExpiry( $expiry, $format = TS_MW ) {
 707                 return $this->__call( __FUNCTION__, func_get_args() );
 708         }
 709
 710         public function setBigSelects( $value = true ) {
 711                 return $this->__call( __FUNCTION__, func_get_args() );
 712         }
 713
 714         public function isReadOnly() {
 715                 return $this->__call( __FUNCTION__, func_get_args() );
 716         }
 717
 718         public function setTableAliases( array $aliases ) {
 719                 return $this->__call( __FUNCTION__, func_get_args() );
 720         }
 721
 722         public function setIndexAliases( array $aliases ) {
 723                 return $this->__call( __FUNCTION__, func_get_args() );
 724         }
 725
 726         /**
 727          * Error out if the role is not DB_MASTER
 728          *
 729          * Note that the underlying connection may or may not itself be read-only.
 730          * It could even be to a writable master (both server-side and to the application).
 731          * This error is meant for the case when a DB_REPLICA handle was requested but a
 732          * a write was attempted on that handle regardless.
 733          *
 734          * In configurations where the master DB has some generic read load or is the only server,
 735          * DB_MASTER/DB_REPLICA will sometimes (or always) use the same connection to the master DB.
 736          * This does not effect the role of DBConnRef instances.
 737          * @throws DBReadOnlyRoleError
 738          */
 739         protected function assertRoleAllowsWrites() {
 740                 // DB_MASTER is "prima facie" writable
 741                 if ( $this->role !== ILoadBalancer::DB_MASTER ) {
 742                         throw new DBReadOnlyRoleError( $this->conn, "Cannot write with role DB_REPLICA" );
 743                 }
 744         }
 745
 746         /**
 747          * Clean up the connection when out of scope
 748          */
 749         function __destruct() {
 750                 if ( $this->conn ) {
 751                         $this->lb->reuseConnection( $this->conn );
 752                 }
 753         }
 754 }
 755
 756 /**
 757  * @since 1.22
 758  * @deprecated since 1.29
 759  */
 760 class_alias( DBConnRef::class, 'DBConnRef' );