includes/filebackend/lockmanager/LockManagerGroup.php

   1 <?php
   2 /**
   3  * Lock manager registration handling.
   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 LockManager
  22  */
  23 use MediaWiki\MediaWikiServices;
  24 use MediaWiki\Logger\LoggerFactory;
  25 use Wikimedia\Rdbms\LBFactory;
  26
  27 /**
  28  * Class to handle file lock manager registration
  29  *
  30  * @ingroup LockManager
  31  * @since 1.19
  32  */
  33 class LockManagerGroup {
  34         /** @var string domain (usually wiki ID) */
  35         protected $domain;
  36
  37         /** @var LBFactory */
  38         protected $lbFactory;
  39
  40         /** @var array Array of (name => ('class' => ..., 'config' => ..., 'instance' => ...)) */
  41         protected $managers = [];
  42
  43         /**
  44          * Do not call this directly. Use LockManagerGroupFactory.
  45          *
  46          * @param string $domain Domain (usually wiki ID)
  47          * @param array[] $lockManagerConfigs In format of $wgLockManagers
  48          * @param LBFactory $lbFactory
  49          */
  50         public function __construct( $domain, array $lockManagerConfigs, LBFactory $lbFactory ) {
  51                 $this->domain = $domain;
  52                 $this->lbFactory = $lbFactory;
  53
  54                 foreach ( $lockManagerConfigs as $config ) {
  55                         $config['domain'] = $this->domain;
  56                         if ( !isset( $config['name'] ) ) {
  57                                 throw new Exception( "Cannot register a lock manager with no name." );
  58                         }
  59                         $name = $config['name'];
  60                         if ( !isset( $config['class'] ) ) {
  61                                 throw new Exception( "Cannot register lock manager `{$name}` with no class." );
  62                         }
  63                         $class = $config['class'];
  64                         unset( $config['class'] ); // lock manager won't need this
  65                         $this->managers[$name] = [
  66                                 'class' => $class,
  67                                 'config' => $config,
  68                                 'instance' => null
  69                         ];
  70                 }
  71         }
  72
  73         /**
  74          * @deprecated since 1.34, use LockManagerGroupFactory
  75          *
  76          * @param bool|string $domain Domain (usually wiki ID). Default: false.
  77          * @return LockManagerGroup
  78          */
  79         public static function singleton( $domain = false ) {
  80                 return MediaWikiServices::getInstance()->getLockManagerGroupFactory()
  81                         ->getLockManagerGroup( $domain );
  82         }
  83
  84         /**
  85          * Destroy the singleton instances
  86          *
  87          * @deprecated since 1.34, use resetServiceForTesting() on LockManagerGroupFactory
  88          */
  89         public static function destroySingletons() {
  90                 MediaWikiServices::getInstance()->resetServiceForTesting( 'LockManagerGroupFactory' );
  91         }
  92
  93         /**
  94          * Get the lock manager object with a given name
  95          *
  96          * @param string $name
  97          * @return LockManager
  98          * @throws Exception
  99          */
 100         public function get( $name ) {
 101                 if ( !isset( $this->managers[$name] ) ) {
 102                         throw new Exception( "No lock manager defined with the name `$name`." );
 103                 }
 104                 // Lazy-load the actual lock manager instance
 105                 if ( !isset( $this->managers[$name]['instance'] ) ) {
 106                         $class = $this->managers[$name]['class'];
 107                         $config = $this->managers[$name]['config'];
 108                         if ( $class === DBLockManager::class ) {
 109                                 $lb = $this->lbFactory->getMainLB( $config['domain'] );
 110                                 $config['dbServers']['localDBMaster'] = $lb->getLazyConnectionRef(
 111                                         DB_MASTER,
 112                                         [],
 113                                         $config['domain'],
 114                                         $lb::CONN_TRX_AUTOCOMMIT
 115                                 );
 116                                 $config['srvCache'] = ObjectCache::getLocalServerInstance( 'hash' );
 117                         }
 118                         $config['logger'] = LoggerFactory::getInstance( 'LockManager' );
 119
 120                         // XXX Looks like phan is right, we are trying to instantiate an abstract class and it
 121                         // throws. Did this ever work? Presumably we need to detect the right subclass? Or
 122                         // should we just get rid of this? It looks like it never worked since it was first
 123                         // introduced by 0cf832a3394 in 2016, so if no one's complained until now, clearly it
 124                         // can't be very useful?
 125                         // @phan-suppress-next-line PhanTypeInstantiateAbstract
 126                         $this->managers[$name]['instance'] = new $class( $config );
 127                 }
 128
 129                 return $this->managers[$name]['instance'];
 130         }
 131
 132         /**
 133          * Get the config array for a lock manager object with a given name
 134          *
 135          * @param string $name
 136          * @return array
 137          * @throws Exception
 138          */
 139         public function config( $name ) {
 140                 if ( !isset( $this->managers[$name] ) ) {
 141                         throw new Exception( "No lock manager defined with the name `$name`." );
 142                 }
 143                 $class = $this->managers[$name]['class'];
 144
 145                 return [ 'class' => $class ] + $this->managers[$name]['config'];
 146         }
 147
 148         /**
 149          * Get the default lock manager configured for the site.
 150          * Returns NullLockManager if no lock manager could be found.
 151          *
 152          * XXX This looks unused, should we just get rid of it?
 153          *
 154          * @return LockManager
 155          */
 156         public function getDefault() {
 157                 return isset( $this->managers['default'] )
 158                         ? $this->get( 'default' )
 159                         : new NullLockManager( [] );
 160         }
 161
 162         /**
 163          * Get the default lock manager configured for the site
 164          * or at least some other effective configured lock manager.
 165          * Throws an exception if no lock manager could be found.
 166          *
 167          * XXX This looks unused, should we just get rid of it?
 168          *
 169          * @return LockManager
 170          * @throws Exception
 171          */
 172         public function getAny() {
 173                 return isset( $this->managers['default'] )
 174                         ? $this->get( 'default' )
 175                         : $this->get( 'fsLockManager' );
 176         }
 177 }