--- /dev/null
+<?php
+/**
+ * Generator of database load balancing objects.
+ *
+ * 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
+ * @ingroup Database
+ */
+
+use MediaWiki\Logger\LoggerFactory;
+use MediaWiki\MediaWikiServices;
+use Wikimedia\Rdbms\DatabaseDomain;
+
+/**
+ * MediaWiki-specific class for generating database load balancers
+ * @ingroup Database
+ */
+abstract class MWLBFactory {
+ /**
+ * @param array $lbConf Config for LBFactory::__construct()
+ * @param Config $mainConfig Main config object from MediaWikiServices
+ * @param ConfiguredReadOnlyMode $readOnlyMode
+ * @return array
+ */
+ public static function applyDefaultConfig( array $lbConf, Config $mainConfig,
+ ConfiguredReadOnlyMode $readOnlyMode
+ ) {
+ global $wgCommandLineMode;
+
+ static $typesWithSchema = [ 'postgres', 'msssql' ];
+
+ $lbConf += [
+ 'localDomain' => new DatabaseDomain(
+ $mainConfig->get( 'DBname' ),
+ null,
+ $mainConfig->get( 'DBprefix' )
+ ),
+ 'profiler' => Profiler::instance(),
+ 'trxProfiler' => Profiler::instance()->getTransactionProfiler(),
+ 'replLogger' => LoggerFactory::getInstance( 'DBReplication' ),
+ 'queryLogger' => LoggerFactory::getInstance( 'DBQuery' ),
+ 'connLogger' => LoggerFactory::getInstance( 'DBConnection' ),
+ 'perfLogger' => LoggerFactory::getInstance( 'DBPerformance' ),
+ 'errorLogger' => [ MWExceptionHandler::class, 'logException' ],
+ 'cliMode' => $wgCommandLineMode,
+ 'hostname' => wfHostname(),
+ 'readOnlyReason' => $readOnlyMode->getReason(),
+ ];
+
+ // When making changes here, remember to also specify MediaWiki-specific options
+ // for Database classes in the relevant Installer subclass.
+ // Such as MysqlInstaller::openConnection and PostgresInstaller::openConnectionWithParams.
+ if ( $lbConf['class'] === 'LBFactorySimple' ) {
+ if ( isset( $lbConf['servers'] ) ) {
+ // Server array is already explicitly configured; leave alone
+ } elseif ( is_array( $mainConfig->get( 'DBservers' ) ) ) {
+ foreach ( $mainConfig->get( 'DBservers' ) as $i => $server ) {
+ if ( $server['type'] === 'sqlite' ) {
+ $server += [ 'dbDirectory' => $mainConfig->get( 'SQLiteDataDir' ) ];
+ } elseif ( $server['type'] === 'postgres' ) {
+ $server += [
+ 'port' => $mainConfig->get( 'DBport' ),
+ // Work around the reserved word usage in MediaWiki schema
+ 'keywordTableMap' => [ 'user' => 'mwuser', 'text' => 'pagecontent' ]
+ ];
+ } elseif ( $server['type'] === 'mssql' ) {
+ $server += [
+ 'port' => $mainConfig->get( 'DBport' ),
+ 'useWindowsAuth' => $mainConfig->get( 'DBWindowsAuthentication' )
+ ];
+ }
+
+ if ( in_array( $server['type'], $typesWithSchema, true ) ) {
+ $server += [ 'schema' => $mainConfig->get( 'DBmwschema' ) ];
+ }
+
+ $server += [
+ 'tablePrefix' => $mainConfig->get( 'DBprefix' ),
+ 'flags' => DBO_DEFAULT,
+ 'sqlMode' => $mainConfig->get( 'SQLMode' ),
+ 'utf8Mode' => $mainConfig->get( 'DBmysql5' )
+ ];
+
+ $lbConf['servers'][$i] = $server;
+ }
+ } else {
+ $flags = DBO_DEFAULT;
+ $flags |= $mainConfig->get( 'DebugDumpSql' ) ? DBO_DEBUG : 0;
+ $flags |= $mainConfig->get( 'DBssl' ) ? DBO_SSL : 0;
+ $flags |= $mainConfig->get( 'DBcompress' ) ? DBO_COMPRESS : 0;
+ $server = [
+ 'host' => $mainConfig->get( 'DBserver' ),
+ 'user' => $mainConfig->get( 'DBuser' ),
+ 'password' => $mainConfig->get( 'DBpassword' ),
+ 'dbname' => $mainConfig->get( 'DBname' ),
+ 'tablePrefix' => $mainConfig->get( 'DBprefix' ),
+ 'type' => $mainConfig->get( 'DBtype' ),
+ 'load' => 1,
+ 'flags' => $flags,
+ 'sqlMode' => $mainConfig->get( 'SQLMode' ),
+ 'utf8Mode' => $mainConfig->get( 'DBmysql5' )
+ ];
+ if ( in_array( $server['type'], $typesWithSchema, true ) ) {
+ $server += [ 'schema' => $mainConfig->get( 'DBmwschema' ) ];
+ }
+ if ( $server['type'] === 'sqlite' ) {
+ $server[ 'dbDirectory'] = $mainConfig->get( 'SQLiteDataDir' );
+ } elseif ( $server['type'] === 'postgres' ) {
+ $server['port'] = $mainConfig->get( 'DBport' );
+ // Work around the reserved word usage in MediaWiki schema
+ $server['keywordTableMap'] = [ 'user' => 'mwuser', 'text' => 'pagecontent' ];
+ } elseif ( $server['type'] === 'mssql' ) {
+ $server['port'] = $mainConfig->get( 'DBport' );
+ $server['useWindowsAuth'] = $mainConfig->get( 'DBWindowsAuthentication' );
+ }
+ $lbConf['servers'] = [ $server ];
+ }
+ if ( !isset( $lbConf['externalClusters'] ) ) {
+ $lbConf['externalClusters'] = $mainConfig->get( 'ExternalServers' );
+ }
+ } elseif ( $lbConf['class'] === 'LBFactoryMulti' ) {
+ if ( isset( $lbConf['serverTemplate'] ) ) {
+ if ( in_array( $lbConf['serverTemplate']['type'], $typesWithSchema, true ) ) {
+ $lbConf['serverTemplate']['schema'] = $mainConfig->get( 'DBmwschema' );
+ }
+ $lbConf['serverTemplate']['sqlMode'] = $mainConfig->get( 'SQLMode' );
+ $lbConf['serverTemplate']['utf8Mode'] = $mainConfig->get( 'DBmysql5' );
+ }
+ }
+
+ // Use APC/memcached style caching, but avoids loops with CACHE_DB (T141804)
+ $sCache = MediaWikiServices::getInstance()->getLocalServerObjectCache();
+ if ( $sCache->getQoS( $sCache::ATTR_EMULATION ) > $sCache::QOS_EMULATION_SQL ) {
+ $lbConf['srvCache'] = $sCache;
+ }
+ $cCache = ObjectCache::getLocalClusterInstance();
+ if ( $cCache->getQoS( $cCache::ATTR_EMULATION ) > $cCache::QOS_EMULATION_SQL ) {
+ $lbConf['memStash'] = $cCache;
+ }
+ $wCache = MediaWikiServices::getInstance()->getMainWANObjectCache();
+ if ( $wCache->getQoS( $wCache::ATTR_EMULATION ) > $wCache::QOS_EMULATION_SQL ) {
+ $lbConf['wanCache'] = $wCache;
+ }
+
+ return $lbConf;
+ }
+
+ /**
+ * Returns the LBFactory class to use and the load balancer configuration.
+ *
+ * @todo instead of this, use a ServiceContainer for managing the different implementations.
+ *
+ * @param array $config (e.g. $wgLBFactoryConf)
+ * @return string Class name
+ */
+ public static function getLBFactoryClass( array $config ) {
+ // For configuration backward compatibility after removing
+ // underscores from class names in MediaWiki 1.23.
+ $bcClasses = [
+ 'LBFactory_Simple' => 'LBFactorySimple',
+ 'LBFactory_Single' => 'LBFactorySingle',
+ 'LBFactory_Multi' => 'LBFactoryMulti'
+ ];
+
+ $class = $config['class'];
+
+ if ( isset( $bcClasses[$class] ) ) {
+ $class = $bcClasses[$class];
+ wfDeprecated(
+ '$wgLBFactoryConf must be updated. See RELEASE-NOTES for details',
+ '1.23'
+ );
+ }
+
+ // For configuration backward compatibility after moving classes to namespaces (1.29)
+ $compat = [
+ 'LBFactorySingle' => Wikimedia\Rdbms\LBFactorySingle::class,
+ 'LBFactorySimple' => Wikimedia\Rdbms\LBFactorySimple::class,
+ 'LBFactoryMulti' => Wikimedia\Rdbms\LBFactoryMulti::class
+ ];
+
+ if ( isset( $compat[$class] ) ) {
+ $class = $compat[$class];
+ }
+
+ return $class;
+ }
+}
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