LBFactory.php
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LBFactory.php
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	<?php
	/**
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	* http://www.gnu.org/copyleft/gpl.html
	*
	* @file
	*/
	namespace Wikimedia\Rdbms;

	use Exception;
	use Generator;
	use Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface;
	use Psr\Log\LoggerInterface;
	use Psr\Log\NullLogger;
	use RuntimeException;
	use Throwable;
	use Wikimedia\ObjectCache\BagOStuff;
	use Wikimedia\ObjectCache\EmptyBagOStuff;
	use Wikimedia\ObjectCache\WANObjectCache;
	use Wikimedia\RequestTimeout\CriticalSectionProvider;
	use Wikimedia\ScopedCallback;
	use Wikimedia\Stats\NullStatsdDataFactory;

	/**
	* @see ILBFactory
	* @ingroup Database
	*/
	abstract class LBFactory implements ILBFactory {
	/** @var CriticalSectionProvider\|null */
	private $csProvider;
	/**
	* @var callable\|null An optional callback that returns a ScopedCallback instance,
	* meant to profile the actual query execution in {@see Database::doQuery}
	*/
	private $profiler;
	/** @var TransactionProfiler */
	private $trxProfiler;
	/** @var StatsdDataFactoryInterface */
	private $statsd;
	/** @var LoggerInterface */
	private $logger;
	/** @var callable Error logger */
	private $errorLogger;
	/** @var callable Deprecation logger */
	private $deprecationLogger;

	/** @var ChronologyProtector */
	protected $chronologyProtector;
	/** @var BagOStuff */
	protected $srvCache;
	/** @var WANObjectCache */
	protected $wanCache;
	/** @var DatabaseDomain Local domain */
	protected $localDomain;

	/** @var bool Whether this PHP instance is for a CLI script */
	private $cliMode;
	/** @var string Agent name for query profiling */
	private $agent;

	/** @var array[] $aliases Map of (table => (dbname, schema, prefix) map) */
	private $tableAliases = [];
	/** @var string[] Map of (index alias => index) */
	private $indexAliases = [];
	/** @var DatabaseDomain[]\|string[] Map of (domain alias => DB domain) */
	protected $domainAliases = [];
	/** @var array[] Map of virtual domain to array of cluster and domain */
	protected array $virtualDomainsMapping = [];
	/** @var string[] List of registered virtual domains */
	protected array $virtualDomains = [];
	/** @var callable[] */
	private $replicationWaitCallbacks = [];

	/** @var int\|null Ticket used to delegate transaction ownership */
	private $ticket;
	/** @var string\|false String if a requested DBO_TRX transaction round is active */
	private $trxRoundId = false;
	/** @var string One of the ROUND_* class constants */
	private $trxRoundStage = self::ROUND_CURSORY;
	/** @var int Default replication wait timeout */
	private $replicationWaitTimeout;

	/** @var string\|false Reason all LBs are read-only or false if not */
	protected $readOnlyReason = false;

	/** @var string\|null */
	private $defaultGroup = null;

	private const ROUND_CURSORY = 'cursory';
	private const ROUND_BEGINNING = 'within-begin';
	private const ROUND_COMMITTING = 'within-commit';
	private const ROUND_ROLLING_BACK = 'within-rollback';
	private const ROUND_COMMIT_CALLBACKS = 'within-commit-callbacks';
	private const ROUND_ROLLBACK_CALLBACKS = 'within-rollback-callbacks';
	private const ROUND_ROLLBACK_SESSIONS = 'within-rollback-session';

	/**
	* @var callable
	*/
	private $configCallback = null;

	public function __construct( array $conf ) {
	$this->configure( $conf );

	if ( isset( $conf['configCallback'] ) ) {
	$this->configCallback = $conf['configCallback'];
	}
	}

	/**
	* @param array $conf
	* @return void
	*/
	protected function configure( array $conf ): void {
	$this->localDomain = isset( $conf['localDomain'] )
	? DatabaseDomain::newFromId( $conf['localDomain'] )
	: DatabaseDomain::newUnspecified();

	if ( isset( $conf['readOnlyReason'] ) && is_string( $conf['readOnlyReason'] ) ) {
	$this->readOnlyReason = $conf['readOnlyReason'];
	}

	$this->chronologyProtector = $conf['chronologyProtector'] ?? new ChronologyProtector();
	$this->srvCache = $conf['srvCache'] ?? new EmptyBagOStuff();
	$this->wanCache = $conf['wanCache'] ?? WANObjectCache::newEmpty();

	$this->logger = $conf['logger'] ?? new NullLogger();
	$this->errorLogger = $conf['errorLogger'] ?? static function ( Throwable $e ) {
	trigger_error( get_class( $e ) . ': ' . $e->getMessage(), E_USER_WARNING );
	};
	$this->deprecationLogger = $conf['deprecationLogger'] ?? static function ( $msg ) {
	trigger_error( $msg, E_USER_DEPRECATED );
	};

	$this->profiler = $conf['profiler'] ?? null;
	$this->trxProfiler = $conf['trxProfiler'] ?? new TransactionProfiler();
	$this->statsd = $conf['statsdDataFactory'] ?? new NullStatsdDataFactory();

	$this->csProvider = $conf['criticalSectionProvider'] ?? null;

	$this->cliMode = $conf['cliMode'] ?? ( PHP_SAPI === 'cli' \|\| PHP_SAPI === 'phpdbg' );
	$this->agent = $conf['agent'] ?? '';
	$this->defaultGroup = $conf['defaultGroup'] ?? null;
	$this->replicationWaitTimeout = $this->cliMode ? 60 : 1;
	$this->virtualDomainsMapping = $conf['virtualDomainsMapping'] ?? [];
	$this->virtualDomains = $conf['virtualDomains'] ?? [];

	static $nextTicket;
	$this->ticket = $nextTicket = ( is_int( $nextTicket ) ? $nextTicket++ : mt_rand() );
	}

	public function destroy() {
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->disable( __METHOD__ );
	}
	}

	/**
	* Reload config using the callback passed defined $config['configCallback'].
	*
	* If the config returned by the callback is different from the existing config,
	* this calls reconfigure() on all load balancers, which causes them to invalidate
	* any existing connections and re-connect using the new configuration.
	*
	* Long-running processes should call this from time to time
	* (but not too often, because it is somewhat expensive),
	* preferably after each batch.
	* Maintenance scripts can do that by calling $this->waitForReplication(),
	* which calls this method.
	*/
	public function autoReconfigure(): void {
	if ( !$this->configCallback ) {
	return;
	}

	$conf = ( $this->configCallback )();
	if ( $conf ) {
	$this->reconfigure( $conf );
	}
	}

	/**
	* Reconfigure using the given config array.
	* Any fields omitted from $conf will be taken from the current config.
	*
	* If the config changed, this calls reconfigure() on all load balancers,
	* which causes them to close all existing connections.
	*
	* @note This invalidates the current transaction ticket.
	*
	* @warning This must only be called in top level code such as the execute()
	* method of a maintenance script. Any database connection in use when this
	* method is called will become defunct.
	*
	* @since 1.39
	*
	* @param array $conf A configuration array, using the same structure as
	* the one passed to the constructor (see also $wgLBFactoryConf).
	*/
	public function reconfigure( array $conf ): void {
	if ( !$conf ) {
	return;
	}

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->reconfigure( $conf );
	}
	}

	public function getLocalDomainID(): string {
	return $this->localDomain->getId();
	}

	public function shutdown(
	$flags = self::SHUTDOWN_NORMAL,
	?callable $workCallback = null,
	&$cpIndex = null,
	&$cpClientId = null
	) {
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	if ( ( $flags & self::SHUTDOWN_NO_CHRONPROT ) != self::SHUTDOWN_NO_CHRONPROT ) {
	// Remark all of the relevant DB primary positions
	foreach ( $this->getLBsForOwner() as $lb ) {
	if ( $lb->hasPrimaryConnection() ) {
	$this->chronologyProtector->stageSessionPrimaryPos( $lb );
	}
	}
	// Write the positions to the persistent stash
	$this->chronologyProtector->persistSessionReplicationPositions( $cpIndex );
	$this->logger->debug( __METHOD__ . ': finished ChronologyProtector shutdown' );
	}
	$cpClientId = $this->chronologyProtector->getClientId();

	$this->commitPrimaryChanges( __METHOD__ );

	$this->logger->debug( 'LBFactory shutdown completed' );
	}

	public function getAllLBs() {
	foreach ( $this->getLBsForOwner() as $lb ) {
	yield $lb;
	}
	}

	/**
	* Get all tracked load balancers with the internal "for owner" interface.
	*
	* @return Generator\|ILoadBalancerForOwner[]
	*/
	abstract protected function getLBsForOwner();

	public function flushReplicaSnapshots( $fname = __METHOD__ ) {
	if ( $this->trxRoundId !== false && $this->trxRoundId !== $fname ) {
	$this->logger->warning(
	"$fname: transaction round '{$this->trxRoundId}' still running",
	[ 'exception' => new RuntimeException() ]
	);
	}
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->flushReplicaSnapshots( $fname );
	}
	}

	final public function beginPrimaryChanges( $fname = __METHOD__ ) {
	$this->assertTransactionRoundStage( self::ROUND_CURSORY );
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->flushReplicaSnapshots( $fname );
	}

	$this->trxRoundStage = self::ROUND_BEGINNING;
	if ( $this->trxRoundId !== false ) {
	throw new DBTransactionError(
	null,
	"$fname: transaction round '{$this->trxRoundId}' already started"
	);
	}
	$this->trxRoundId = $fname;
	// Flush snapshots and appropriately set DBO_TRX on primary connections
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->beginPrimaryChanges( $fname );
	}
	$this->trxRoundStage = self::ROUND_CURSORY;
	}

	final public function commitPrimaryChanges( $fname = __METHOD__, int $maxWriteDuration = 0 ) {
	$this->assertTransactionRoundStage( self::ROUND_CURSORY );
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	$this->trxRoundStage = self::ROUND_COMMITTING;
	if ( $this->trxRoundId !== false && $this->trxRoundId !== $fname ) {
	throw new DBTransactionError(
	null,
	"$fname: transaction round '{$this->trxRoundId}' still running"
	);
	}
	// Run pre-commit callbacks and suppress post-commit callbacks, aborting on failure
	do {
	$count = 0; // number of callbacks executed this iteration
	foreach ( $this->getLBsForOwner() as $lb ) {
	$count += $lb->finalizePrimaryChanges( $fname );
	}
	} while ( $count > 0 );
	$this->trxRoundId = false;
	// Perform pre-commit checks, aborting on failure
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->approvePrimaryChanges( $maxWriteDuration, $fname );
	}
	// Log the DBs and methods involved in multi-DB transactions
	$this->logIfMultiDbTransaction();
	// Actually perform the commit on all primary DB connections and revert DBO_TRX
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->commitPrimaryChanges( $fname );
	}
	// Run all post-commit callbacks in a separate step
	$this->trxRoundStage = self::ROUND_COMMIT_CALLBACKS;
	$e = $this->executePostTransactionCallbacks();
	$this->trxRoundStage = self::ROUND_CURSORY;
	// Throw any last post-commit callback error
	if ( $e instanceof Exception ) {
	throw $e;
	}

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->flushReplicaSnapshots( $fname );
	}
	}

	final public function rollbackPrimaryChanges( $fname = __METHOD__ ) {
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	$this->trxRoundStage = self::ROUND_ROLLING_BACK;
	$this->trxRoundId = false;
	// Actually perform the rollback on all primary DB connections and revert DBO_TRX
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->rollbackPrimaryChanges( $fname );
	}
	// Run all post-commit callbacks in a separate step
	$this->trxRoundStage = self::ROUND_ROLLBACK_CALLBACKS;
	$this->executePostTransactionCallbacks();
	$this->trxRoundStage = self::ROUND_CURSORY;

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->flushReplicaSnapshots( $fname );
	}
	}

	final public function flushPrimarySessions( $fname = __METHOD__ ) {
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	// Release named locks and table locks on all primary DB connections
	$this->trxRoundStage = self::ROUND_ROLLBACK_SESSIONS;
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->flushPrimarySessions( $fname );
	}
	$this->trxRoundStage = self::ROUND_CURSORY;
	}

	/**
	* @return Exception\|null
	*/
	private function executePostTransactionCallbacks() {
	$fname = __METHOD__;
	// Run all post-commit callbacks until new ones stop getting added
	$e = null; // first callback exception
	do {
	foreach ( $this->getLBsForOwner() as $lb ) {
	$ex = $lb->runPrimaryTransactionIdleCallbacks( $fname );
	$e = $e ?: $ex;
	}
	} while ( $this->hasPrimaryChanges() );
	// Run all listener callbacks once
	foreach ( $this->getLBsForOwner() as $lb ) {
	$ex = $lb->runPrimaryTransactionListenerCallbacks( $fname );
	$e = $e ?: $ex;
	}

	return $e;
	}

	public function hasTransactionRound() {
	return ( $this->trxRoundId !== false );
	}

	public function isReadyForRoundOperations() {
	return ( $this->trxRoundStage === self::ROUND_CURSORY );
	}

	/**
	* Log query info if multi DB transactions are going to be committed now
	*/
	private function logIfMultiDbTransaction() {
	$callersByDB = [];
	foreach ( $this->getLBsForOwner() as $lb ) {
	$primaryName = $lb->getServerName( ServerInfo::WRITER_INDEX );
	$callers = $lb->pendingPrimaryChangeCallers();
	if ( $callers ) {
	$callersByDB[$primaryName] = $callers;
	}
	}

	if ( count( $callersByDB ) >= 2 ) {
	$dbs = implode( ', ', array_keys( $callersByDB ) );
	$msg = "Multi-DB transaction [{$dbs}]:\n";
	foreach ( $callersByDB as $db => $callers ) {
	$msg .= "$db: " . implode( '; ', $callers ) . "\n";
	}
	$this->logger->info( $msg );
	}
	}

	public function hasPrimaryChanges() {
	foreach ( $this->getLBsForOwner() as $lb ) {
	if ( $lb->hasPrimaryChanges() ) {
	return true;
	}
	}
	return false;
	}

	public function laggedReplicaUsed() {
	foreach ( $this->getLBsForOwner() as $lb ) {
	if ( $lb->laggedReplicaUsed() ) {
	return true;
	}
	}
	return false;
	}

	public function hasOrMadeRecentPrimaryChanges( $age = null ) {
	foreach ( $this->getLBsForOwner() as $lb ) {
	if ( $lb->hasOrMadeRecentPrimaryChanges( $age ) ) {
	return true;
	}
	}
	return false;
	}

	public function waitForReplication( array $opts = [] ) {
	$opts += [
	'timeout' => $this->replicationWaitTimeout,
	'ifWritesSince' => null
	];

	$lbs = [];
	foreach ( $this->getLBsForOwner() as $lb ) {
	$lbs[] = $lb;
	}

	// Get all the primary DB positions of applicable DBs right now.
	// This can be faster since waiting on one cluster reduces the
	// time needed to wait on the next clusters.
	$primaryPositions = array_fill( 0, count( $lbs ), false );
	foreach ( $lbs as $i => $lb ) {
	if (
	// No writes to wait on getting replicated
	!$lb->hasPrimaryConnection() \|\|
	// No replication; avoid getPrimaryPos() permissions errors (T29975)
	!$lb->hasStreamingReplicaServers() \|\|
	// No writes since the last replication wait
	(
	$opts['ifWritesSince'] &&
	$lb->lastPrimaryChangeTimestamp() < $opts['ifWritesSince']
	)
	) {
	continue; // no need to wait
	}

	$primaryPositions[$i] = $lb->getPrimaryPos();
	}

	// Run any listener callbacks after getting the DB positions. The more
	// time spent in the callbacks, the less time is spent in waitForAll().
	foreach ( $this->replicationWaitCallbacks as $callback ) {
	$callback();
	}

	$failed = [];
	foreach ( $lbs as $i => $lb ) {
	if ( $primaryPositions[$i] ) {
	// The RDBMS may not support getPrimaryPos()
	if ( !$lb->waitForAll( $primaryPositions[$i], $opts['timeout'] ) ) {
	$failed[] = $lb->getServerName( ServerInfo::WRITER_INDEX );
	}
	}
	}

	return !$failed;
	}

	public function setWaitForReplicationListener( $name, ?callable $callback = null ) {
	if ( $callback ) {
	$this->replicationWaitCallbacks[$name] = $callback;
	} else {
	unset( $this->replicationWaitCallbacks[$name] );
	}
	}

	public function getEmptyTransactionTicket( $fname ) {
	if ( $this->hasPrimaryChanges() ) {
	$this->logger->error(
	__METHOD__ . ": $fname does not have outer scope",
	[ 'exception' => new RuntimeException() ]
	);

	return null;
	}

	return $this->ticket;
	}

	public function getPrimaryDatabase( $domain = false ): IDatabase {
	return $this->getMappedDatabase( DB_PRIMARY, [], $domain );
	}

	public function getReplicaDatabase( $domain = false, $group = null ): IReadableDatabase {
	if ( $group === null ) {
	$groups = [];
	} else {
	$groups = [ $group ];
	}
	return $this->getMappedDatabase( DB_REPLICA, $groups, $domain );
	}

	public function getLoadBalancer( $domain = false ): ILoadBalancer {
	if ( $domain !== false && in_array( $domain, $this->virtualDomains ) ) {
	if ( isset( $this->virtualDomainsMapping[$domain] ) ) {
	$config = $this->virtualDomainsMapping[$domain];
	if ( isset( $config['cluster'] ) ) {
	return $this->getExternalLB( $config['cluster'] );
	}
	$domain = $config['db'];
	} else {
	// It's not configured, assume local db.
	$domain = false;
	}
	}
	return $this->getMainLB( $domain );
	}

	/**
	* Helper for getPrimaryDatabase and getReplicaDatabase() providing virtual
	* domain mapping.
	*
	* @param int $index
	* @param array $groups
	* @param string\|false $domain
	* @return IDatabase
	*/
	private function getMappedDatabase( $index, $groups, $domain ) {
	if ( $domain !== false && in_array( $domain, $this->virtualDomains ) ) {
	$dbDomain = $this->virtualDomainsMapping[$domain]['db'] ?? false;
	} else {
	$dbDomain = $domain;
	}
	return $this->getLoadBalancer( $domain )->getConnection( $index, $groups, $dbDomain );
	}

	final public function commitAndWaitForReplication( $fname, $ticket, array $opts = [] ) {
	if ( $ticket !== $this->ticket ) {
	$this->logger->error(
	__METHOD__ . ": $fname does not have outer scope ($ticket vs {$this->ticket})",
	[ 'exception' => new RuntimeException() ]
	);

	return false;
	}

	// The transaction owner and any caller with the empty transaction ticket can commit
	// so that getEmptyTransactionTicket() callers don't risk seeing DBTransactionError.
	if ( $this->trxRoundId !== false && $fname !== $this->trxRoundId ) {
	$this->logger->info( "$fname: committing on behalf of {$this->trxRoundId}" );
	$fnameEffective = $this->trxRoundId;
	} else {
	$fnameEffective = $fname;
	}

	$this->commitPrimaryChanges( $fnameEffective );
	$waitSucceeded = $this->waitForReplication( $opts );
	// If a nested caller committed on behalf of $fname, start another empty $fname
	// transaction, leaving the caller with the same empty transaction state as before.
	if ( $fnameEffective !== $fname ) {
	$this->beginPrimaryChanges( $fnameEffective );
	}

	return $waitSucceeded;
	}

	public function disableChronologyProtection() {
	$this->chronologyProtector->setEnabled( false );
	}

	/**
	* Get parameters to ILoadBalancer::__construct()
	*
	* @return array
	*/
	final protected function baseLoadBalancerParams() {
	if ( $this->trxRoundStage === self::ROUND_COMMIT_CALLBACKS ) {
	$initStage = ILoadBalancerForOwner::STAGE_POSTCOMMIT_CALLBACKS;
	} elseif ( $this->trxRoundStage === self::ROUND_ROLLBACK_CALLBACKS ) {
	$initStage = ILoadBalancerForOwner::STAGE_POSTROLLBACK_CALLBACKS;
	} else {
	$initStage = null;
	}

	return [
	'localDomain' => $this->localDomain,
	'readOnlyReason' => $this->readOnlyReason,
	'srvCache' => $this->srvCache,
	'wanCache' => $this->wanCache,
	'profiler' => $this->profiler,
	'trxProfiler' => $this->trxProfiler,
	'logger' => $this->logger,
	'errorLogger' => $this->errorLogger,
	'deprecationLogger' => $this->deprecationLogger,
	'statsdDataFactory' => $this->statsd,
	'cliMode' => $this->cliMode,
	'agent' => $this->agent,
	'defaultGroup' => $this->defaultGroup,
	'chronologyProtector' => $this->chronologyProtector,
	'roundStage' => $initStage,
	'criticalSectionProvider' => $this->csProvider
	];
	}

	/**
	* @param ILoadBalancerForOwner $lb
	*/
	protected function initLoadBalancer( ILoadBalancerForOwner $lb ) {
	if ( $this->trxRoundId !== false ) {
	$lb->beginPrimaryChanges( $this->trxRoundId ); // set DBO_TRX
	}

	$lb->setTableAliases( $this->tableAliases );
	$lb->setIndexAliases( $this->indexAliases );
	$lb->setDomainAliases( $this->domainAliases );
	}

	public function setTableAliases( array $aliases ) {
	$this->tableAliases = $aliases;
	}

	public function setIndexAliases( array $aliases ) {
	$this->indexAliases = $aliases;
	}

	public function setDomainAliases( array $aliases ) {
	$this->domainAliases = $aliases;
	}

	public function getTransactionProfiler(): TransactionProfiler {
	return $this->trxProfiler;
	}

	public function setLocalDomainPrefix( $prefix ) {
	$this->localDomain = new DatabaseDomain(
	$this->localDomain->getDatabase(),
	$this->localDomain->getSchema(),
	$prefix
	);

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->setLocalDomainPrefix( $prefix );
	}
	}

	public function redefineLocalDomain( $domain ) {
	$this->closeAll( __METHOD__ );

	$this->localDomain = DatabaseDomain::newFromId( $domain );

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->redefineLocalDomain( $this->localDomain );
	}
	}

	public function closeAll( $fname = __METHOD__ ) {
	/** @noinspection PhpUnusedLocalVariableInspection */
	$scope = ScopedCallback::newScopedIgnoreUserAbort();

	foreach ( $this->getLBsForOwner() as $lb ) {
	$lb->closeAll( $fname );
	}
	}

	public function setAgentName( $agent ) {
	$this->agent = $agent;
	}

	public function hasStreamingReplicaServers() {
	foreach ( $this->getLBsForOwner() as $lb ) {
	if ( $lb->hasStreamingReplicaServers() ) {
	return true;
	}
	}
	return false;
	}

	public function setDefaultReplicationWaitTimeout( $seconds ) {
	$old = $this->replicationWaitTimeout;
	$this->replicationWaitTimeout = max( 1, (int)$seconds );

	return $old;
	}

	/**
	* @param string $stage
	*/
	private function assertTransactionRoundStage( $stage ) {
	if ( $this->trxRoundStage !== $stage ) {
	throw new DBTransactionError(
	null,
	"Transaction round stage must be '$stage' (not '{$this->trxRoundStage}')"
	);
	}
	}
	}

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