includes/db/MWLBFactory.php

   1 <?php
   2 /**
   3  * Generator of database load balancing objects.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 use MediaWiki\Logger\LoggerFactory;
  25 use MediaWiki\MediaWikiServices;
  26 use Wikimedia\Rdbms\DatabaseDomain;
  27
  28 /**
  29  * MediaWiki-specific class for generating database load balancers
  30  * @ingroup Database
  31  */
  32 abstract class MWLBFactory {
  33         /**
  34          * @param array $lbConf Config for LBFactory::__construct()
  35          * @param Config $mainConfig Main config object from MediaWikiServices
  36          * @return array
  37          */
  38         public static function applyDefaultConfig( array $lbConf, Config $mainConfig ) {
  39                 global $wgCommandLineMode;
  40
  41                 static $typesWithSchema = [ 'postgres', 'msssql' ];
  42
  43                 $lbConf += [
  44                         'localDomain' => new DatabaseDomain(
  45                                 $mainConfig->get( 'DBname' ),
  46                                 null,
  47                                 $mainConfig->get( 'DBprefix' )
  48                         ),
  49                         'profiler' => Profiler::instance(),
  50                         'trxProfiler' => Profiler::instance()->getTransactionProfiler(),
  51                         'replLogger' => LoggerFactory::getInstance( 'DBReplication' ),
  52                         'queryLogger' => LoggerFactory::getInstance( 'DBQuery' ),
  53                         'connLogger' => LoggerFactory::getInstance( 'DBConnection' ),
  54                         'perfLogger' => LoggerFactory::getInstance( 'DBPerformance' ),
  55                         'errorLogger' => [ MWExceptionHandler::class, 'logException' ],
  56                         'cliMode' => $wgCommandLineMode,
  57                         'hostname' => wfHostname(),
  58                         // TODO: replace the global wfConfiguredReadOnlyReason() with a service.
  59                         'readOnlyReason' => wfConfiguredReadOnlyReason(),
  60                 ];
  61
  62                 if ( $lbConf['class'] === 'LBFactorySimple' ) {
  63                         if ( isset( $lbConf['servers'] ) ) {
  64                                 // Server array is already explicitly configured; leave alone
  65                         } elseif ( is_array( $mainConfig->get( 'DBservers' ) ) ) {
  66                                 foreach ( $mainConfig->get( 'DBservers' ) as $i => $server ) {
  67                                         if ( $server['type'] === 'sqlite' ) {
  68                                                 $server += [ 'dbDirectory' => $mainConfig->get( 'SQLiteDataDir' ) ];
  69                                         } elseif ( $server['type'] === 'postgres' ) {
  70                                                 $server += [
  71                                                         'port' => $mainConfig->get( 'DBport' ),
  72                                                         // Work around the reserved word usage in MediaWiki schema
  73                                                         'keywordTableMap' => [ 'user' => 'mwuser', 'text' => 'pagecontent' ]
  74                                                 ];
  75                                         }
  76                                         if ( in_array( $server['type'], $typesWithSchema, true ) ) {
  77                                                 $server += [ 'schema' => $mainConfig->get( 'DBmwschema' ) ];
  78                                         }
  79
  80                                         $server += [
  81                                                 'tablePrefix' => $mainConfig->get( 'DBprefix' ),
  82                                                 'flags' => DBO_DEFAULT,
  83                                                 'sqlMode' => $mainConfig->get( 'SQLMode' ),
  84                                                 'utf8Mode' => $mainConfig->get( 'DBmysql5' )
  85                                         ];
  86
  87                                         $lbConf['servers'][$i] = $server;
  88                                 }
  89                         } else {
  90                                 $flags = DBO_DEFAULT;
  91                                 $flags |= $mainConfig->get( 'DebugDumpSql' ) ? DBO_DEBUG : 0;
  92                                 $flags |= $mainConfig->get( 'DBssl' ) ? DBO_SSL : 0;
  93                                 $flags |= $mainConfig->get( 'DBcompress' ) ? DBO_COMPRESS : 0;
  94                                 $server = [
  95                                         'host' => $mainConfig->get( 'DBserver' ),
  96                                         'user' => $mainConfig->get( 'DBuser' ),
  97                                         'password' => $mainConfig->get( 'DBpassword' ),
  98                                         'dbname' => $mainConfig->get( 'DBname' ),
  99                                         'tablePrefix' => $mainConfig->get( 'DBprefix' ),
 100                                         'type' => $mainConfig->get( 'DBtype' ),
 101                                         'load' => 1,
 102                                         'flags' => $flags,
 103                                         'sqlMode' => $mainConfig->get( 'SQLMode' ),
 104                                         'utf8Mode' => $mainConfig->get( 'DBmysql5' )
 105                                 ];
 106                                 if ( in_array( $server['type'], $typesWithSchema, true ) ) {
 107                                         $server += [ 'schema' => $mainConfig->get( 'DBmwschema' ) ];
 108                                 }
 109                                 if ( $server['type'] === 'sqlite' ) {
 110                                         $server[ 'dbDirectory'] = $mainConfig->get( 'SQLiteDataDir' );
 111                                 } elseif ( $server['type'] === 'postgres' ) {
 112                                         $server['port'] = $mainConfig->get( 'DBport' );
 113                                         // Work around the reserved word usage in MediaWiki schema
 114                                         $server['keywordTableMap'] = [ 'user' => 'mwuser', 'text' => 'pagecontent' ];
 115                                 }
 116                                 $lbConf['servers'] = [ $server ];
 117                         }
 118                         if ( !isset( $lbConf['externalClusters'] ) ) {
 119                                 $lbConf['externalClusters'] = $mainConfig->get( 'ExternalServers' );
 120                         }
 121                 } elseif ( $lbConf['class'] === 'LBFactoryMulti' ) {
 122                         if ( isset( $lbConf['serverTemplate'] ) ) {
 123                                 if ( in_array( $lbConf['serverTemplate']['type'], $typesWithSchema, true ) ) {
 124                                         $lbConf['serverTemplate']['schema'] = $mainConfig->get( 'DBmwschema' );
 125                                 }
 126                                 $lbConf['serverTemplate']['sqlMode'] = $mainConfig->get( 'SQLMode' );
 127                                 $lbConf['serverTemplate']['utf8Mode'] = $mainConfig->get( 'DBmysql5' );
 128                         }
 129                 }
 130
 131                 // Use APC/memcached style caching, but avoids loops with CACHE_DB (T141804)
 132                 $sCache = MediaWikiServices::getInstance()->getLocalServerObjectCache();
 133                 if ( $sCache->getQoS( $sCache::ATTR_EMULATION ) > $sCache::QOS_EMULATION_SQL ) {
 134                         $lbConf['srvCache'] = $sCache;
 135                 }
 136                 $cCache = ObjectCache::getLocalClusterInstance();
 137                 if ( $cCache->getQoS( $cCache::ATTR_EMULATION ) > $cCache::QOS_EMULATION_SQL ) {
 138                         $lbConf['memCache'] = $cCache;
 139                 }
 140                 $wCache = MediaWikiServices::getInstance()->getMainWANObjectCache();
 141                 if ( $wCache->getQoS( $wCache::ATTR_EMULATION ) > $wCache::QOS_EMULATION_SQL ) {
 142                         $lbConf['wanCache'] = $wCache;
 143                 }
 144
 145                 return $lbConf;
 146         }
 147
 148         /**
 149          * Returns the LBFactory class to use and the load balancer configuration.
 150          *
 151          * @todo instead of this, use a ServiceContainer for managing the different implementations.
 152          *
 153          * @param array $config (e.g. $wgLBFactoryConf)
 154          * @return string Class name
 155          */
 156         public static function getLBFactoryClass( array $config ) {
 157                 // For configuration backward compatibility after removing
 158                 // underscores from class names in MediaWiki 1.23.
 159                 $bcClasses = [
 160                         'LBFactory_Simple' => 'LBFactorySimple',
 161                         'LBFactory_Single' => 'LBFactorySingle',
 162                         'LBFactory_Multi' => 'LBFactoryMulti'
 163                 ];
 164
 165                 $class = $config['class'];
 166
 167                 if ( isset( $bcClasses[$class] ) ) {
 168                         $class = $bcClasses[$class];
 169                         wfDeprecated(
 170                                 '$wgLBFactoryConf must be updated. See RELEASE-NOTES for details',
 171                                 '1.23'
 172                         );
 173                 }
 174
 175                 // For configuration backward compatibility after moving classes to namespaces (1.29)
 176                 $compat = [
 177                         'LBFactorySingle' => Wikimedia\Rdbms\LBFactorySingle::class,
 178                         'LBFactorySimple' => Wikimedia\Rdbms\LBFactorySimple::class,
 179                         'LBFactoryMulti' => Wikimedia\Rdbms\LBFactoryMulti::class
 180                 ];
 181
 182                 if ( isset( $compat[$class] ) ) {
 183                         $class = $compat[$class];
 184                 }
 185
 186                 return $class;
 187         }
 188 }