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 Wikimedia\Rdbms\LBFactory;
  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         /** @var array Cache of already-logged deprecation messages */
  35         private static $loggedDeprecations = [];
  36
  37         /**
  38          * @param array $lbConf Config for LBFactory::__construct()
  39          * @param Config $mainConfig Main config object from MediaWikiServices
  40          * @param ConfiguredReadOnlyMode $readOnlyMode
  41          * @param BagOStuff $srvCace
  42          * @param BagOStuff $mainStash
  43          * @param WANObjectCache $wanCache
  44          * @return array
  45          */
  46         public static function applyDefaultConfig(
  47                 array $lbConf,
  48                 Config $mainConfig,
  49                 ConfiguredReadOnlyMode $readOnlyMode,
  50                 BagOStuff $srvCace,
  51                 BagOStuff $mainStash,
  52                 WANObjectCache $wanCache
  53         ) {
  54                 global $wgCommandLineMode;
  55
  56                 static $typesWithSchema = [ 'postgres', 'msssql' ];
  57
  58                 $lbConf += [
  59                         'localDomain' => new DatabaseDomain(
  60                                 $mainConfig->get( 'DBname' ),
  61                                 $mainConfig->get( 'DBmwschema' ),
  62                                 $mainConfig->get( 'DBprefix' )
  63                         ),
  64                         'profiler' => function ( $section ) {
  65                                 return Profiler::instance()->scopedProfileIn( $section );
  66                         },
  67                         'trxProfiler' => Profiler::instance()->getTransactionProfiler(),
  68                         'replLogger' => LoggerFactory::getInstance( 'DBReplication' ),
  69                         'queryLogger' => LoggerFactory::getInstance( 'DBQuery' ),
  70                         'connLogger' => LoggerFactory::getInstance( 'DBConnection' ),
  71                         'perfLogger' => LoggerFactory::getInstance( 'DBPerformance' ),
  72                         'errorLogger' => [ MWExceptionHandler::class, 'logException' ],
  73                         'deprecationLogger' => [ static::class, 'logDeprecation' ],
  74                         'cliMode' => $wgCommandLineMode,
  75                         'hostname' => wfHostname(),
  76                         'readOnlyReason' => $readOnlyMode->getReason(),
  77                         'defaultGroup' => $mainConfig->get( 'DBDefaultGroup' ),
  78                 ];
  79
  80                 // When making changes here, remember to also specify MediaWiki-specific options
  81                 // for Database classes in the relevant Installer subclass.
  82                 // Such as MysqlInstaller::openConnection and PostgresInstaller::openConnectionWithParams.
  83                 if ( $lbConf['class'] === Wikimedia\Rdbms\LBFactorySimple::class ) {
  84                         if ( isset( $lbConf['servers'] ) ) {
  85                                 // Server array is already explicitly configured; leave alone
  86                         } elseif ( is_array( $mainConfig->get( 'DBservers' ) ) ) {
  87                                 foreach ( $mainConfig->get( 'DBservers' ) as $i => $server ) {
  88                                         if ( $server['type'] === 'sqlite' ) {
  89                                                 $server += [ 'dbDirectory' => $mainConfig->get( 'SQLiteDataDir' ) ];
  90                                         } elseif ( $server['type'] === 'postgres' ) {
  91                                                 $server += [
  92                                                         'port' => $mainConfig->get( 'DBport' ),
  93                                                         // Work around the reserved word usage in MediaWiki schema
  94                                                         'keywordTableMap' => [ 'user' => 'mwuser', 'text' => 'pagecontent' ]
  95                                                 ];
  96                                         } elseif ( $server['type'] === 'mssql' ) {
  97                                                 $server += [
  98                                                         'port' => $mainConfig->get( 'DBport' ),
  99                                                         'useWindowsAuth' => $mainConfig->get( 'DBWindowsAuthentication' )
 100                                                 ];
 101                                         } elseif ( $server['type'] === 'mysql' ) {
 102                                                 // A DB name is not needed to connect to mysql; 'dbname' is useless.
 103                                                 // This field only defines the DB to use for unspecified DB domains.
 104                                                 $ldDB = $mainConfig->get( 'DBname' ); // local domain DB
 105                                                 $srvDB = $server['dbname'] ?? null; // server DB
 106                                                 if ( $srvDB !== null && $srvDB !== $ldDB ) {
 107                                                         self::reportMismatchedDBs( $srvDB, $ldDB );
 108                                                 }
 109                                         }
 110
 111                                         $ldTP = $mainConfig->get( 'DBprefix' ); // local domain prefix
 112                                         $srvTP = $server['tablePrefix'] ?? null; // server table prefix
 113                                         if ( $srvTP !== '' && $srvTP !== $ldTP ) {
 114                                                 self::reportMismatchedPrefixes( $srvTP, $ldTP );
 115                                         }
 116
 117                                         if ( in_array( $server['type'], $typesWithSchema, true ) ) {
 118                                                 $server += [ 'schema' => $mainConfig->get( 'DBmwschema' ) ];
 119                                         }
 120
 121                                         $server += [
 122                                                 'tablePrefix' => $mainConfig->get( 'DBprefix' ),
 123                                                 'flags' => DBO_DEFAULT,
 124                                                 'sqlMode' => $mainConfig->get( 'SQLMode' ),
 125                                                 'utf8Mode' => $mainConfig->get( 'DBmysql5' )
 126                                         ];
 127
 128                                         $lbConf['servers'][$i] = $server;
 129                                 }
 130                         } else {
 131                                 $flags = DBO_DEFAULT;
 132                                 $flags |= $mainConfig->get( 'DebugDumpSql' ) ? DBO_DEBUG : 0;
 133                                 $flags |= $mainConfig->get( 'DBssl' ) ? DBO_SSL : 0;
 134                                 $flags |= $mainConfig->get( 'DBcompress' ) ? DBO_COMPRESS : 0;
 135                                 $server = [
 136                                         'host' => $mainConfig->get( 'DBserver' ),
 137                                         'user' => $mainConfig->get( 'DBuser' ),
 138                                         'password' => $mainConfig->get( 'DBpassword' ),
 139                                         'dbname' => $mainConfig->get( 'DBname' ),
 140                                         'tablePrefix' => $mainConfig->get( 'DBprefix' ),
 141                                         'type' => $mainConfig->get( 'DBtype' ),
 142                                         'load' => 1,
 143                                         'flags' => $flags,
 144                                         'sqlMode' => $mainConfig->get( 'SQLMode' ),
 145                                         'utf8Mode' => $mainConfig->get( 'DBmysql5' )
 146                                 ];
 147                                 if ( in_array( $server['type'], $typesWithSchema, true ) ) {
 148                                         $server += [ 'schema' => $mainConfig->get( 'DBmwschema' ) ];
 149                                 }
 150                                 if ( $server['type'] === 'sqlite' ) {
 151                                         $server[ 'dbDirectory'] = $mainConfig->get( 'SQLiteDataDir' );
 152                                 } elseif ( $server['type'] === 'postgres' ) {
 153                                         $server['port'] = $mainConfig->get( 'DBport' );
 154                                         // Work around the reserved word usage in MediaWiki schema
 155                                         $server['keywordTableMap'] = [ 'user' => 'mwuser', 'text' => 'pagecontent' ];
 156                                 } elseif ( $server['type'] === 'mssql' ) {
 157                                         $server['port'] = $mainConfig->get( 'DBport' );
 158                                         $server['useWindowsAuth'] = $mainConfig->get( 'DBWindowsAuthentication' );
 159                                 }
 160                                 $lbConf['servers'] = [ $server ];
 161                         }
 162                         if ( !isset( $lbConf['externalClusters'] ) ) {
 163                                 $lbConf['externalClusters'] = $mainConfig->get( 'ExternalServers' );
 164                         }
 165                 } elseif ( $lbConf['class'] === Wikimedia\Rdbms\LBFactoryMulti::class ) {
 166                         if ( isset( $lbConf['serverTemplate'] ) ) {
 167                                 if ( in_array( $lbConf['serverTemplate']['type'], $typesWithSchema, true ) ) {
 168                                         $lbConf['serverTemplate']['schema'] = $mainConfig->get( 'DBmwschema' );
 169                                 }
 170                                 $lbConf['serverTemplate']['sqlMode'] = $mainConfig->get( 'SQLMode' );
 171                                 $lbConf['serverTemplate']['utf8Mode'] = $mainConfig->get( 'DBmysql5' );
 172                         }
 173                 }
 174
 175                 $lbConf = self::applyDefaultCaching( $lbConf, $srvCace, $mainStash, $wanCache );
 176
 177                 return $lbConf;
 178         }
 179
 180         /**
 181          * @param array $lbConf
 182          * @param BagOStuff $sCache
 183          * @param BagOStuff $mStash
 184          * @param WANObjectCache $wCache
 185          * @return array
 186          */
 187         private static function applyDefaultCaching(
 188                 array $lbConf, BagOStuff $sCache, BagOStuff $mStash, WANObjectCache $wCache
 189         ) {
 190                 // Use APC/memcached style caching, but avoids loops with CACHE_DB (T141804)
 191                 if ( $sCache->getQoS( $sCache::ATTR_EMULATION ) > $sCache::QOS_EMULATION_SQL ) {
 192                         $lbConf['srvCache'] = $sCache;
 193                 }
 194                 if ( $mStash->getQoS( $mStash::ATTR_EMULATION ) > $mStash::QOS_EMULATION_SQL ) {
 195                         $lbConf['memStash'] = $mStash;
 196                 }
 197                 if ( $wCache->getQoS( $wCache::ATTR_EMULATION ) > $wCache::QOS_EMULATION_SQL ) {
 198                         $lbConf['wanCache'] = $wCache;
 199                 }
 200
 201                 return $lbConf;
 202         }
 203
 204         /**
 205          * @param string $srvDB Server config database
 206          * @param string $ldDB Local DB domain database
 207          */
 208         private static function reportMismatchedDBs( $srvDB, $ldDB ) {
 209                 $e = new UnexpectedValueException(
 210                         "\$wgDBservers has dbname='$srvDB' but \$wgDBname='$ldDB'. " .
 211                         "Set \$wgDBname to the database used by this wiki project. " .
 212                         "There is rarely a need to set 'dbname' in \$wgDBservers. " .
 213                         "Functions like wfWikiId(), remote wiki database access, the use " .
 214                         "of Database::getDomainId(), and other features are not reliable when " .
 215                         "\$wgDBservers does not match the local wiki database/prefix."
 216                 );
 217                 MWExceptionRenderer::output( $e, MWExceptionRenderer::AS_PRETTY );
 218                 exit;
 219         }
 220
 221         /**
 222          * @param string $srvTP Server config table prefix
 223          * @param string $ldTP Local DB domain database
 224          */
 225         private static function reportMismatchedPrefixes( $srvTP, $ldTP ) {
 226                 $e = new UnexpectedValueException(
 227                         "\$wgDBservers has tablePrefix='$srvTP' but \$wgDBprefix='$ldTP'. " .
 228                         "Set \$wgDBprefix to the table prefix used by this wiki project. " .
 229                         "There is rarely a need to set 'tablePrefix' in \$wgDBservers. " .
 230                         "Functions like wfWikiId(), remote wiki database access, the use " .
 231                         "of Database::getDomainId(), and other features are not reliable when " .
 232                         "\$wgDBservers does not match the local wiki database/prefix."
 233                 );
 234                 MWExceptionRenderer::output( $e, MWExceptionRenderer::AS_PRETTY );
 235                 exit;
 236         }
 237
 238         /**
 239          * Returns the LBFactory class to use and the load balancer configuration.
 240          *
 241          * @todo instead of this, use a ServiceContainer for managing the different implementations.
 242          *
 243          * @param array $config (e.g. $wgLBFactoryConf)
 244          * @return string Class name
 245          */
 246         public static function getLBFactoryClass( array $config ) {
 247                 // For configuration backward compatibility after removing
 248                 // underscores from class names in MediaWiki 1.23.
 249                 $bcClasses = [
 250                         'LBFactory_Simple' => 'LBFactorySimple',
 251                         'LBFactory_Single' => 'LBFactorySingle',
 252                         'LBFactory_Multi' => 'LBFactoryMulti'
 253                 ];
 254
 255                 $class = $config['class'];
 256
 257                 if ( isset( $bcClasses[$class] ) ) {
 258                         $class = $bcClasses[$class];
 259                         wfDeprecated(
 260                                 '$wgLBFactoryConf must be updated. See RELEASE-NOTES for details',
 261                                 '1.23'
 262                         );
 263                 }
 264
 265                 // For configuration backward compatibility after moving classes to namespaces (1.29)
 266                 $compat = [
 267                         'LBFactorySingle' => Wikimedia\Rdbms\LBFactorySingle::class,
 268                         'LBFactorySimple' => Wikimedia\Rdbms\LBFactorySimple::class,
 269                         'LBFactoryMulti' => Wikimedia\Rdbms\LBFactoryMulti::class
 270                 ];
 271
 272                 if ( isset( $compat[$class] ) ) {
 273                         $class = $compat[$class];
 274                 }
 275
 276                 return $class;
 277         }
 278
 279         public static function setSchemaAliases( LBFactory $lbFactory, Config $config ) {
 280                 if ( $config->get( 'DBtype' ) === 'mysql' ) {
 281                         /**
 282                          * When SQLite indexes were introduced in r45764, it was noted that
 283                          * SQLite requires index names to be unique within the whole database,
 284                          * not just within a schema. As discussed in CR r45819, to avoid the
 285                          * need for a schema change on existing installations, the indexes
 286                          * were implicitly mapped from the new names to the old names.
 287                          *
 288                          * This mapping can be removed if DB patches are introduced to alter
 289                          * the relevant tables in existing installations. Note that because
 290                          * this index mapping applies to table creation, even new installations
 291                          * of MySQL have the old names (except for installations created during
 292                          * a period where this mapping was inappropriately removed, see
 293                          * T154872).
 294                          */
 295                         $lbFactory->setIndexAliases( [
 296                                 'ar_usertext_timestamp' => 'usertext_timestamp',
 297                                 'un_user_id' => 'user_id',
 298                                 'un_user_ip' => 'user_ip',
 299                         ] );
 300                 }
 301         }
 302
 303         /**
 304          * Log a database deprecation warning
 305          * @param string $msg Deprecation message
 306          */
 307         public static function logDeprecation( $msg ) {
 308                 global $wgDevelopmentWarnings;
 309
 310                 if ( isset( self::$loggedDeprecations[$msg] ) ) {
 311                         return;
 312                 }
 313                 self::$loggedDeprecations[$msg] = true;
 314
 315                 if ( $wgDevelopmentWarnings ) {
 316                         trigger_error( $msg, E_USER_DEPRECATED );
 317                 }
 318                 wfDebugLog( 'deprecated', $msg, 'private' );
 319         }
 320 }