tests/phpunit/includes/db/LoadBalancerTest.php

   1 <?php
   2
   3 /**
   4  * Holds tests for LoadBalancer MediaWiki class.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  */
  23
  24 use Wikimedia\Rdbms\DBError;
  25 use Wikimedia\Rdbms\DatabaseDomain;
  26 use Wikimedia\Rdbms\Database;
  27 use Wikimedia\Rdbms\LoadBalancer;
  28 use Wikimedia\Rdbms\LoadMonitorNull;
  29 use Wikimedia\TestingAccessWrapper;
  30
  31 /**
  32  * @group Database
  33  * @group medium
  34  * @covers \Wikimedia\Rdbms\LoadBalancer
  35  */
  36 class LoadBalancerTest extends MediaWikiTestCase {
  37         private function makeServerConfig( $flags = DBO_DEFAULT ) {
  38                 global $wgDBserver, $wgDBname, $wgDBuser, $wgDBpassword, $wgDBtype, $wgSQLiteDataDir;
  39
  40                 return [
  41                         'host' => $wgDBserver,
  42                         'dbname' => $wgDBname,
  43                         'tablePrefix' => $this->dbPrefix(),
  44                         'user' => $wgDBuser,
  45                         'password' => $wgDBpassword,
  46                         'type' => $wgDBtype,
  47                         'dbDirectory' => $wgSQLiteDataDir,
  48                         'load' => 0,
  49                         'flags' => $flags
  50                 ];
  51         }
  52
  53         /**
  54          * @covers LoadBalancer::getLocalDomainID()
  55          * @covers LoadBalancer::resolveDomainID()
  56          */
  57         public function testWithoutReplica() {
  58                 global $wgDBname;
  59
  60                 $called = false;
  61                 $lb = new LoadBalancer( [
  62                         // Simulate web request with DBO_TRX
  63                         'servers' => [ $this->makeServerConfig( DBO_TRX ) ],
  64                         'queryLogger' => MediaWiki\Logger\LoggerFactory::getInstance( 'DBQuery' ),
  65                         'localDomain' => new DatabaseDomain( $wgDBname, null, $this->dbPrefix() ),
  66                         'chronologyCallback' => function () use ( &$called ) {
  67                                 $called = true;
  68                         }
  69                 ] );
  70
  71                 $ld = DatabaseDomain::newFromId( $lb->getLocalDomainID() );
  72                 $this->assertEquals( $wgDBname, $ld->getDatabase(), 'local domain DB set' );
  73                 $this->assertEquals( $this->dbPrefix(), $ld->getTablePrefix(), 'local domain prefix set' );
  74                 $this->assertSame( 'my_test_wiki', $lb->resolveDomainID( 'my_test_wiki' ) );
  75                 $this->assertSame( $ld->getId(), $lb->resolveDomainID( false ) );
  76                 $this->assertSame( $ld->getId(), $lb->resolveDomainID( $ld ) );
  77                 $this->assertFalse( $called );
  78
  79                 $dbw = $lb->getConnection( DB_MASTER );
  80                 $this->assertTrue( $called );
  81                 $this->assertTrue( $dbw->getLBInfo( 'master' ), 'master shows as master' );
  82                 $this->assertTrue( $dbw->getFlag( $dbw::DBO_TRX ), "DBO_TRX set on master" );
  83                 $this->assertWriteAllowed( $dbw );
  84
  85                 $dbr = $lb->getConnection( DB_REPLICA );
  86                 $this->assertTrue( $dbr->getLBInfo( 'master' ), 'DB_REPLICA also gets the master' );
  87                 $this->assertTrue( $dbr->getFlag( $dbw::DBO_TRX ), "DBO_TRX set on replica" );
  88
  89                 if ( !$lb->getServerAttributes( $lb->getWriterIndex() )[$dbw::ATTR_DB_LEVEL_LOCKING] ) {
  90                         $dbwAuto = $lb->getConnection( DB_MASTER, [], false, $lb::CONN_TRX_AUTOCOMMIT );
  91                         $this->assertFalse(
  92                                 $dbwAuto->getFlag( $dbw::DBO_TRX ), "No DBO_TRX with CONN_TRX_AUTOCOMMIT" );
  93                         $this->assertTrue( $dbw->getFlag( $dbw::DBO_TRX ), "DBO_TRX still set on master" );
  94                         $this->assertNotEquals(
  95                                 $dbw, $dbwAuto, "CONN_TRX_AUTOCOMMIT uses separate connection" );
  96
  97                         $dbrAuto = $lb->getConnection( DB_REPLICA, [], false, $lb::CONN_TRX_AUTOCOMMIT );
  98                         $this->assertFalse(
  99                                 $dbrAuto->getFlag( $dbw::DBO_TRX ), "No DBO_TRX with CONN_TRX_AUTOCOMMIT" );
 100                         $this->assertTrue( $dbr->getFlag( $dbw::DBO_TRX ), "DBO_TRX still set on replica" );
 101                         $this->assertNotEquals(
 102                                 $dbr, $dbrAuto, "CONN_TRX_AUTOCOMMIT uses separate connection" );
 103
 104                         $dbwAuto2 = $lb->getConnection( DB_MASTER, [], false, $lb::CONN_TRX_AUTOCOMMIT );
 105                         $this->assertEquals( $dbwAuto2, $dbwAuto, "CONN_TRX_AUTOCOMMIT reuses connections" );
 106                 }
 107
 108                 $lb->closeAll();
 109         }
 110
 111         public function testWithReplica() {
 112                 global $wgDBserver;
 113
 114                 // Simulate web request with DBO_TRX
 115                 $lb = $this->newMultiServerLocalLoadBalancer( [], [ 'flags' => DBO_TRX ] );
 116
 117                 $this->assertEquals( 8, $lb->getServerCount() );
 118                 $this->assertTrue( $lb->hasReplicaServers() );
 119                 $this->assertTrue( $lb->hasStreamingReplicaServers() );
 120
 121                 $dbw = $lb->getConnection( DB_MASTER );
 122                 $this->assertTrue( $dbw->getLBInfo( 'master' ), 'master shows as master' );
 123                 $this->assertEquals(
 124                         ( $wgDBserver != '' ) ? $wgDBserver : 'localhost',
 125                         $dbw->getLBInfo( 'clusterMasterHost' ),
 126                         'cluster master set' );
 127                 $this->assertTrue( $dbw->getFlag( $dbw::DBO_TRX ), "DBO_TRX set on master" );
 128                 $this->assertWriteAllowed( $dbw );
 129
 130                 $dbr = $lb->getConnection( DB_REPLICA );
 131                 $this->assertTrue( $dbr->getLBInfo( 'replica' ), 'replica shows as replica' );
 132                 $this->assertEquals(
 133                         ( $wgDBserver != '' ) ? $wgDBserver : 'localhost',
 134                         $dbr->getLBInfo( 'clusterMasterHost' ),
 135                         'cluster master set' );
 136                 $this->assertTrue( $dbr->getFlag( $dbw::DBO_TRX ), "DBO_TRX set on replica" );
 137                 $this->assertWriteForbidden( $dbr );
 138
 139                 if ( !$lb->getServerAttributes( $lb->getWriterIndex() )[$dbw::ATTR_DB_LEVEL_LOCKING] ) {
 140                         $dbwAuto = $lb->getConnection( DB_MASTER, [], false, $lb::CONN_TRX_AUTOCOMMIT );
 141                         $this->assertFalse(
 142                                 $dbwAuto->getFlag( $dbw::DBO_TRX ), "No DBO_TRX with CONN_TRX_AUTOCOMMIT" );
 143                         $this->assertTrue( $dbw->getFlag( $dbw::DBO_TRX ), "DBO_TRX still set on master" );
 144                         $this->assertNotEquals(
 145                                 $dbw, $dbwAuto, "CONN_TRX_AUTOCOMMIT uses separate connection" );
 146
 147                         $dbrAuto = $lb->getConnection( DB_REPLICA, [], false, $lb::CONN_TRX_AUTOCOMMIT );
 148                         $this->assertFalse(
 149                                 $dbrAuto->getFlag( $dbw::DBO_TRX ), "No DBO_TRX with CONN_TRX_AUTOCOMMIT" );
 150                         $this->assertTrue( $dbr->getFlag( $dbw::DBO_TRX ), "DBO_TRX still set on replica" );
 151                         $this->assertNotEquals(
 152                                 $dbr, $dbrAuto, "CONN_TRX_AUTOCOMMIT uses separate connection" );
 153
 154                         $dbwAuto2 = $lb->getConnection( DB_MASTER, [], false, $lb::CONN_TRX_AUTOCOMMIT );
 155                         $this->assertEquals( $dbwAuto2, $dbwAuto, "CONN_TRX_AUTOCOMMIT reuses connections" );
 156                 }
 157
 158                 $lb->closeAll();
 159         }
 160
 161         private function newSingleServerLocalLoadBalancer() {
 162                 global $wgDBname;
 163
 164                 return new LoadBalancer( [
 165                         'servers' => [ $this->makeServerConfig() ],
 166                         'localDomain' => new DatabaseDomain( $wgDBname, null, $this->dbPrefix() )
 167                 ] );
 168         }
 169
 170         private function newMultiServerLocalLoadBalancer(
 171                 $lbExtra = [], $srvExtra = [], $masterOnly = false
 172         ) {
 173                 global $wgDBserver, $wgDBname, $wgDBuser, $wgDBpassword, $wgDBtype, $wgSQLiteDataDir;
 174
 175                 $servers = [
 176                         // Master DB
 177                         0 => $srvExtra + [
 178                                 'host' => $wgDBserver,
 179                                 'dbname' => $wgDBname,
 180                                 'tablePrefix' => $this->dbPrefix(),
 181                                 'user' => $wgDBuser,
 182                                 'password' => $wgDBpassword,
 183                                 'type' => $wgDBtype,
 184                                 'dbDirectory' => $wgSQLiteDataDir,
 185                                 'load' => $masterOnly ? 100 : 0,
 186                         ],
 187                         // Main replica DBs
 188                         1 => $srvExtra + [
 189                                 'host' => $wgDBserver,
 190                                 'dbname' => $wgDBname,
 191                                 'tablePrefix' => $this->dbPrefix(),
 192                                 'user' => $wgDBuser,
 193                                 'password' => $wgDBpassword,
 194                                 'type' => $wgDBtype,
 195                                 'dbDirectory' => $wgSQLiteDataDir,
 196                                 'load' => $masterOnly ? 0 : 100,
 197                         ],
 198                         2 => $srvExtra + [
 199                                 'host' => $wgDBserver,
 200                                 'dbname' => $wgDBname,
 201                                 'tablePrefix' => $this->dbPrefix(),
 202                                 'user' => $wgDBuser,
 203                                 'password' => $wgDBpassword,
 204                                 'type' => $wgDBtype,
 205                                 'dbDirectory' => $wgSQLiteDataDir,
 206                                 'load' => $masterOnly ? 0 : 100,
 207                         ],
 208                         // RC replica DBs
 209                         3 => $srvExtra + [
 210                                 'host' => $wgDBserver,
 211                                 'dbname' => $wgDBname,
 212                                 'tablePrefix' => $this->dbPrefix(),
 213                                 'user' => $wgDBuser,
 214                                 'password' => $wgDBpassword,
 215                                 'type' => $wgDBtype,
 216                                 'dbDirectory' => $wgSQLiteDataDir,
 217                                 'load' => 0,
 218                                 'groupLoads' => [
 219                                         'recentchanges' => 100,
 220                                         'watchlist' => 100
 221                                 ],
 222                         ],
 223                         // Logging replica DBs
 224                         4 => $srvExtra + [
 225                                 'host' => $wgDBserver,
 226                                 'dbname' => $wgDBname,
 227                                 'tablePrefix' => $this->dbPrefix(),
 228                                 'user' => $wgDBuser,
 229                                 'password' => $wgDBpassword,
 230                                 'type' => $wgDBtype,
 231                                 'dbDirectory' => $wgSQLiteDataDir,
 232                                 'load' => 0,
 233                                 'groupLoads' => [
 234                                         'logging' => 100
 235                                 ],
 236                         ],
 237                         5 => $srvExtra + [
 238                                 'host' => $wgDBserver,
 239                                 'dbname' => $wgDBname,
 240                                 'tablePrefix' => $this->dbPrefix(),
 241                                 'user' => $wgDBuser,
 242                                 'password' => $wgDBpassword,
 243                                 'type' => $wgDBtype,
 244                                 'dbDirectory' => $wgSQLiteDataDir,
 245                                 'load' => 0,
 246                                 'groupLoads' => [
 247                                         'logging' => 100
 248                                 ],
 249                         ],
 250                         // Maintenance query replica DBs
 251                         6 => $srvExtra + [
 252                                 'host' => $wgDBserver,
 253                                 'dbname' => $wgDBname,
 254                                 'tablePrefix' => $this->dbPrefix(),
 255                                 'user' => $wgDBuser,
 256                                 'password' => $wgDBpassword,
 257                                 'type' => $wgDBtype,
 258                                 'dbDirectory' => $wgSQLiteDataDir,
 259                                 'load' => 0,
 260                                 'groupLoads' => [
 261                                         'vslow' => 100
 262                                 ],
 263                         ],
 264                         // Replica DB that only has a copy of some static tables
 265                         7 => $srvExtra + [
 266                                 'host' => $wgDBserver,
 267                                 'dbname' => $wgDBname,
 268                                 'tablePrefix' => $this->dbPrefix(),
 269                                 'user' => $wgDBuser,
 270                                 'password' => $wgDBpassword,
 271                                 'type' => $wgDBtype,
 272                                 'dbDirectory' => $wgSQLiteDataDir,
 273                                 'load' => 0,
 274                                 'groupLoads' => [
 275                                         'archive' => 100
 276                                 ],
 277                                 'is static' => true
 278                         ]
 279                 ];
 280
 281                 return new LoadBalancer( $lbExtra + [
 282                         'servers' => $servers,
 283                         'localDomain' => new DatabaseDomain( $wgDBname, null, $this->dbPrefix() ),
 284                         'queryLogger' => MediaWiki\Logger\LoggerFactory::getInstance( 'DBQuery' ),
 285                         'loadMonitorClass' => LoadMonitorNull::class
 286                 ] );
 287         }
 288
 289         private function assertWriteForbidden( Database $db ) {
 290                 try {
 291                         $db->delete( 'some_table', [ 'id' => 57634126 ], __METHOD__ );
 292                         $this->fail( 'Write operation should have failed!' );
 293                 } catch ( DBError $ex ) {
 294                         // check that the exception message contains "Write operation"
 295                         $constraint = new PHPUnit_Framework_Constraint_StringContains( 'Write operation' );
 296
 297                         if ( !$constraint->evaluate( $ex->getMessage(), '', true ) ) {
 298                                 // re-throw original error, to preserve stack trace
 299                                 throw $ex;
 300                         }
 301                 }
 302         }
 303
 304         private function assertWriteAllowed( Database $db ) {
 305                 $table = $db->tableName( 'some_table' );
 306                 // Trigger a transaction so that rollback() will remove all the tables.
 307                 // Don't do this for MySQL/Oracle as they auto-commit transactions for DDL
 308                 // statements such as CREATE TABLE.
 309                 $useAtomicSection = in_array( $db->getType(), [ 'sqlite', 'postgres', 'mssql' ], true );
 310                 try {
 311                         $db->dropTable( 'some_table' ); // clear for sanity
 312                         $this->assertNotEquals( $db::STATUS_TRX_ERROR, $db->trxStatus() );
 313
 314                         if ( $useAtomicSection ) {
 315                                 $db->startAtomic( __METHOD__ );
 316                         }
 317                         // Use only basic SQL and trivial types for these queries for compatibility
 318                         $this->assertNotSame(
 319                                 false,
 320                                 $db->query( "CREATE TABLE $table (id INT, time INT)", __METHOD__ ),
 321                                 "table created"
 322                         );
 323                         $this->assertNotEquals( $db::STATUS_TRX_ERROR, $db->trxStatus() );
 324                         $this->assertNotSame(
 325                                 false,
 326                                 $db->query( "DELETE FROM $table WHERE id=57634126", __METHOD__ ),
 327                                 "delete query"
 328                         );
 329                         $this->assertNotEquals( $db::STATUS_TRX_ERROR, $db->trxStatus() );
 330                 } finally {
 331                         if ( !$useAtomicSection ) {
 332                                 // Drop the table to clean up, ignoring any error.
 333                                 $db->dropTable( 'some_table' );
 334                         }
 335                         // Rollback the atomic section for sqlite's benefit.
 336                         $db->rollback( __METHOD__, 'flush' );
 337                         $this->assertNotEquals( $db::STATUS_TRX_ERROR, $db->trxStatus() );
 338                 }
 339         }
 340
 341         public function testServerAttributes() {
 342                 $servers = [
 343                         [ // master
 344                                 'dbname'      => 'my_unittest_wiki',
 345                                 'tablePrefix' => 'unittest_',
 346                                 'type'        => 'sqlite',
 347                                 'dbDirectory' => "some_directory",
 348                                 'load'        => 0
 349                         ]
 350                 ];
 351
 352                 $lb = new LoadBalancer( [
 353                         'servers' => $servers,
 354                         'localDomain' => new DatabaseDomain( 'my_unittest_wiki', null, 'unittest_' ),
 355                         'loadMonitorClass' => LoadMonitorNull::class
 356                 ] );
 357
 358                 $this->assertTrue( $lb->getServerAttributes( 0 )[Database::ATTR_DB_LEVEL_LOCKING] );
 359
 360                 $servers = [
 361                         [ // master
 362                                 'host'        => 'db1001',
 363                                 'user'        => 'wikiuser',
 364                                 'password'    => 'none',
 365                                 'dbname'      => 'my_unittest_wiki',
 366                                 'tablePrefix' => 'unittest_',
 367                                 'type'        => 'mysql',
 368                                 'load'        => 100
 369                         ],
 370                         [ // emulated replica
 371                                 'host'        => 'db1002',
 372                                 'user'        => 'wikiuser',
 373                                 'password'    => 'none',
 374                                 'dbname'      => 'my_unittest_wiki',
 375                                 'tablePrefix' => 'unittest_',
 376                                 'type'        => 'mysql',
 377                                 'load'        => 100
 378                         ]
 379                 ];
 380
 381                 $lb = new LoadBalancer( [
 382                         'servers' => $servers,
 383                         'localDomain' => new DatabaseDomain( 'my_unittest_wiki', null, 'unittest_' ),
 384                         'loadMonitorClass' => LoadMonitorNull::class
 385                 ] );
 386
 387                 $this->assertFalse( $lb->getServerAttributes( 1 )[Database::ATTR_DB_LEVEL_LOCKING] );
 388         }
 389
 390         /**
 391          * @covers LoadBalancer::openConnection()
 392          * @covers LoadBalancer::getAnyOpenConnection()
 393          */
 394         function testOpenConnection() {
 395                 $lb = $this->newSingleServerLocalLoadBalancer();
 396
 397                 $i = $lb->getWriterIndex();
 398                 $this->assertEquals( null, $lb->getAnyOpenConnection( $i ) );
 399
 400                 $conn1 = $lb->getConnection( $i );
 401                 $this->assertNotEquals( null, $conn1 );
 402                 $this->assertEquals( $conn1, $lb->getAnyOpenConnection( $i ) );
 403                 $this->assertFalse( $conn1->getFlag( DBO_TRX ) );
 404
 405                 $conn2 = $lb->getConnection( $i, [], false, $lb::CONN_TRX_AUTOCOMMIT );
 406                 $this->assertNotEquals( null, $conn2 );
 407                 $this->assertFalse( $conn2->getFlag( DBO_TRX ) );
 408
 409                 if ( $lb->getServerAttributes( $i )[Database::ATTR_DB_LEVEL_LOCKING] ) {
 410                         $this->assertEquals( null,
 411                                 $lb->getAnyOpenConnection( $i, $lb::CONN_TRX_AUTOCOMMIT ) );
 412                         $this->assertEquals( $conn1,
 413                                 $lb->getConnection(
 414                                         $i, [], false, $lb::CONN_TRX_AUTOCOMMIT ), $lb::CONN_TRX_AUTOCOMMIT );
 415                 } else {
 416                         $this->assertEquals( $conn2,
 417                                 $lb->getAnyOpenConnection( $i, $lb::CONN_TRX_AUTOCOMMIT ) );
 418                         $this->assertEquals( $conn2,
 419                                 $lb->getConnection( $i, [], false, $lb::CONN_TRX_AUTOCOMMIT ) );
 420
 421                         $conn2->startAtomic( __METHOD__ );
 422                         try {
 423                                 $lb->getConnection( $i, [], false, $lb::CONN_TRX_AUTOCOMMIT );
 424                                 $conn2->endAtomic( __METHOD__ );
 425                                 $this->fail( "No exception thrown." );
 426                         } catch ( DBUnexpectedError $e ) {
 427                                 $this->assertEquals(
 428                                         'Handle requested with CONN_TRX_AUTOCOMMIT yet it has a transaction',
 429                                         $e->getMessage()
 430                                 );
 431                         }
 432                         $conn2->endAtomic( __METHOD__ );
 433                 }
 434
 435                 $lb->closeAll();
 436         }
 437
 438         public function testTransactionCallbackChains() {
 439                 global $wgDBserver, $wgDBname, $wgDBuser, $wgDBpassword, $wgDBtype, $wgSQLiteDataDir;
 440
 441                 $servers = [
 442                         [
 443                                 'host' => $wgDBserver,
 444                                 'dbname' => $wgDBname,
 445                                 'tablePrefix' => $this->dbPrefix(),
 446                                 'user' => $wgDBuser,
 447                                 'password' => $wgDBpassword,
 448                                 'type' => $wgDBtype,
 449                                 'dbDirectory' => $wgSQLiteDataDir,
 450                                 'load' => 0,
 451                                 'flags' => DBO_TRX // simulate a web request with DBO_TRX
 452                         ],
 453                 ];
 454
 455                 $lb = new LoadBalancer( [
 456                         'servers' => $servers,
 457                         'localDomain' => new DatabaseDomain( $wgDBname, null, $this->dbPrefix() )
 458                 ] );
 459
 460                 $conn1 = $lb->openConnection( $lb->getWriterIndex(), false );
 461                 $conn2 = $lb->openConnection( $lb->getWriterIndex(), '' );
 462
 463                 $count = 0;
 464                 $lb->forEachOpenMasterConnection( function () use ( &$count ) {
 465                         ++$count;
 466                 } );
 467                 $this->assertEquals( 2, $count, 'Connection handle count' );
 468
 469                 $tlCalls = 0;
 470                 $lb->setTransactionListener( 'test-listener', function () use ( &$tlCalls ) {
 471                         ++$tlCalls;
 472                 } );
 473
 474                 $lb->beginMasterChanges( __METHOD__ );
 475                 $bc = array_fill_keys( [ 'a', 'b', 'c', 'd' ], 0 );
 476                 $conn1->onTransactionPreCommitOrIdle( function () use ( &$bc, $conn1, $conn2 ) {
 477                         $bc['a'] = 1;
 478                         $conn2->onTransactionPreCommitOrIdle( function () use ( &$bc, $conn1, $conn2 ) {
 479                                 $bc['b'] = 1;
 480                                 $conn1->onTransactionPreCommitOrIdle( function () use ( &$bc, $conn1, $conn2 ) {
 481                                         $bc['c'] = 1;
 482                                         $conn1->onTransactionPreCommitOrIdle( function () use ( &$bc, $conn1, $conn2 ) {
 483                                                 $bc['d'] = 1;
 484                                         } );
 485                                 } );
 486                         } );
 487                 } );
 488                 $lb->finalizeMasterChanges();
 489                 $lb->approveMasterChanges( [] );
 490                 $lb->commitMasterChanges( __METHOD__ );
 491                 $lb->runMasterTransactionIdleCallbacks();
 492                 $lb->runMasterTransactionListenerCallbacks();
 493
 494                 $this->assertEquals( array_fill_keys( [ 'a', 'b', 'c', 'd' ], 1 ), $bc );
 495                 $this->assertEquals( 2, $tlCalls );
 496
 497                 $tlCalls = 0;
 498                 $lb->beginMasterChanges( __METHOD__ );
 499                 $ac = array_fill_keys( [ 'a', 'b', 'c', 'd' ], 0 );
 500                 $conn1->onTransactionCommitOrIdle( function () use ( &$ac, $conn1, $conn2 ) {
 501                         $ac['a'] = 1;
 502                         $conn2->onTransactionCommitOrIdle( function () use ( &$ac, $conn1, $conn2 ) {
 503                                 $ac['b'] = 1;
 504                                 $conn1->onTransactionCommitOrIdle( function () use ( &$ac, $conn1, $conn2 ) {
 505                                         $ac['c'] = 1;
 506                                         $conn1->onTransactionCommitOrIdle( function () use ( &$ac, $conn1, $conn2 ) {
 507                                                 $ac['d'] = 1;
 508                                         } );
 509                                 } );
 510                         } );
 511                 } );
 512                 $lb->finalizeMasterChanges();
 513                 $lb->approveMasterChanges( [] );
 514                 $lb->commitMasterChanges( __METHOD__ );
 515                 $lb->runMasterTransactionIdleCallbacks();
 516                 $lb->runMasterTransactionListenerCallbacks();
 517
 518                 $this->assertEquals( array_fill_keys( [ 'a', 'b', 'c', 'd' ], 1 ), $ac );
 519                 $this->assertEquals( 2, $tlCalls );
 520
 521                 $conn1->close();
 522                 $conn2->close();
 523         }
 524
 525         public function testDBConnRefReadsMasterAndReplicaRoles() {
 526                 $lb = $this->newSingleServerLocalLoadBalancer();
 527
 528                 $rConn = $lb->getConnectionRef( DB_REPLICA );
 529                 $wConn = $lb->getConnectionRef( DB_MASTER );
 530                 $wConn2 = $lb->getConnectionRef( 0 );
 531
 532                 $v = [ 'value' => '1', '1' ];
 533                 $sql = 'SELECT MAX(1) AS value';
 534                 foreach ( [ $rConn, $wConn, $wConn2 ] as $conn ) {
 535                         $conn->clearFlag( $conn::DBO_TRX );
 536
 537                         $res = $conn->query( $sql, __METHOD__ );
 538                         $this->assertEquals( $v, $conn->fetchRow( $res ) );
 539
 540                         $res = $conn->query( $sql, __METHOD__, $conn::QUERY_REPLICA_ROLE );
 541                         $this->assertEquals( $v, $conn->fetchRow( $res ) );
 542                 }
 543
 544                 $wConn->getScopedLockAndFlush( 'key', __METHOD__, 1 );
 545                 $wConn2->getScopedLockAndFlush( 'key2', __METHOD__, 1 );
 546         }
 547
 548         /**
 549          * @expectedException \Wikimedia\Rdbms\DBReadOnlyRoleError
 550          */
 551         public function testDBConnRefWritesReplicaRole() {
 552                 $lb = $this->newSingleServerLocalLoadBalancer();
 553
 554                 $rConn = $lb->getConnectionRef( DB_REPLICA );
 555
 556                 $rConn->query( 'DELETE FROM sometesttable WHERE 1=0' );
 557         }
 558
 559         /**
 560          * @expectedException \Wikimedia\Rdbms\DBReadOnlyRoleError
 561          */
 562         public function testDBConnRefWritesReplicaRoleIndex() {
 563                 $lb = $this->newMultiServerLocalLoadBalancer();
 564
 565                 $rConn = $lb->getConnectionRef( 1 );
 566
 567                 $rConn->query( 'DELETE FROM sometesttable WHERE 1=0' );
 568         }
 569
 570         /**
 571          * @expectedException \Wikimedia\Rdbms\DBReadOnlyRoleError
 572          */
 573         public function testDBConnRefWritesReplicaRoleInsert() {
 574                 $lb = $this->newMultiServerLocalLoadBalancer();
 575
 576                 $rConn = $lb->getConnectionRef( DB_REPLICA );
 577
 578                 $rConn->insert( 'test', [ 't' => 1 ], __METHOD__ );
 579         }
 580
 581         public function testQueryGroupIndex() {
 582                 $lb = $this->newMultiServerLocalLoadBalancer( [ 'defaultGroup' => false ] );
 583                 /** @var LoadBalancer $lbWrapper */
 584                 $lbWrapper = TestingAccessWrapper::newFromObject( $lb );
 585
 586                 $rGeneric = $lb->getConnectionRef( DB_REPLICA );
 587                 $mainIndexPicked = $rGeneric->getLBInfo( 'serverIndex' );
 588
 589                 $this->assertEquals( $mainIndexPicked, $lbWrapper->getExistingReaderIndex( false ) );
 590                 $this->assertTrue( in_array( $mainIndexPicked, [ 1, 2 ] ) );
 591                 for ( $i = 0; $i < 300; ++$i ) {
 592                         $rLog = $lb->getConnectionRef( DB_REPLICA, [] );
 593                         $this->assertEquals(
 594                                 $mainIndexPicked,
 595                                 $rLog->getLBInfo( 'serverIndex' ),
 596                                 "Main index unchanged" );
 597                 }
 598
 599                 $rRC = $lb->getConnectionRef( DB_REPLICA, [ 'recentchanges' ] );
 600                 $rWL = $lb->getConnectionRef( DB_REPLICA, [ 'watchlist' ] );
 601
 602                 $this->assertEquals( 3, $rRC->getLBInfo( 'serverIndex' ) );
 603                 $this->assertEquals( 3, $rWL->getLBInfo( 'serverIndex' ) );
 604
 605                 $rLog = $lb->getConnectionRef( DB_REPLICA, [ 'logging', 'watchlist' ] );
 606                 $logIndexPicked = $rLog->getLBInfo( 'serverIndex' );
 607
 608                 $this->assertEquals( $logIndexPicked, $lbWrapper->getExistingReaderIndex( 'logging' ) );
 609                 $this->assertTrue( in_array( $logIndexPicked, [ 4, 5 ] ) );
 610
 611                 for ( $i = 0; $i < 300; ++$i ) {
 612                         $rLog = $lb->getConnectionRef( DB_REPLICA, [ 'logging', 'watchlist' ] );
 613                         $this->assertEquals(
 614                                 $logIndexPicked, $rLog->getLBInfo( 'serverIndex' ), "Index unchanged" );
 615                 }
 616
 617                 $rVslow = $lb->getConnectionRef( DB_REPLICA, [ 'vslow', 'logging' ] );
 618                 $vslowIndexPicked = $rVslow->getLBInfo( 'serverIndex' );
 619
 620                 $this->assertEquals( $vslowIndexPicked, $lbWrapper->getExistingReaderIndex( 'vslow' ) );
 621                 $this->assertEquals( 6, $vslowIndexPicked );
 622         }
 623
 624         public function testNonZeroMasterLoad() {
 625                 $lb = $this->newMultiServerLocalLoadBalancer( [], [ 'flags' => DBO_DEFAULT ], true );
 626                 // Make sure that no infinite loop occurs (T226678)
 627                 $rGeneric = $lb->getConnectionRef( DB_REPLICA );
 628                 $this->assertEquals( $lb->getWriterIndex(), $rGeneric->getLBInfo( 'serverIndex' ) );
 629         }
 630 }