includes/filerepo/ForeignDBViaLBRepo.php

   1 <?php
   2 /**
   3  * A foreign repository with a MediaWiki database accessible via the configured LBFactory.
   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 FileRepo
  22  */
  23
  24 /**
  25  * A foreign repository with a MediaWiki database accessible via the configured LBFactory
  26  *
  27  * @ingroup FileRepo
  28  */
  29 class ForeignDBViaLBRepo extends LocalRepo {
  30         /** @var string */
  31         protected $wiki;
  32
  33         /** @var string */
  34         protected $dbName;
  35
  36         /** @var string */
  37         protected $tablePrefix;
  38
  39         /** @var array */
  40         protected $fileFactory = [ 'ForeignDBFile', 'newFromTitle' ];
  41
  42         /** @var array */
  43         protected $fileFromRowFactory = [ 'ForeignDBFile', 'newFromRow' ];
  44
  45         /** @var bool */
  46         protected $hasSharedCache;
  47
  48         /**
  49          * @param array|null $info
  50          */
  51         function __construct( $info ) {
  52                 parent::__construct( $info );
  53                 $this->wiki = $info['wiki'];
  54                 list( $this->dbName, $this->tablePrefix ) = wfSplitWikiID( $this->wiki );
  55                 $this->hasSharedCache = $info['hasSharedCache'];
  56         }
  57
  58         /**
  59          * @return IDatabase
  60          */
  61         function getMasterDB() {
  62                 return wfGetDB( DB_MASTER, [], $this->wiki );
  63         }
  64
  65         /**
  66          * @return IDatabase
  67          */
  68         function getSlaveDB() {
  69                 return wfGetDB( DB_REPLICA, [], $this->wiki );
  70         }
  71
  72         /**
  73          * @return Closure
  74          */
  75         protected function getDBFactory() {
  76                 $wiki = $this->wiki;
  77                 return function( $index ) use ( $wiki ) {
  78                         return wfGetDB( $index, [], $wiki );
  79                 };
  80         }
  81
  82         function hasSharedCache() {
  83                 return $this->hasSharedCache;
  84         }
  85
  86         /**
  87          * Get a key on the primary cache for this repository.
  88          * Returns false if the repository's cache is not accessible at this site.
  89          * The parameters are the parts of the key, as for wfMemcKey().
  90          * @return bool|string
  91          */
  92         function getSharedCacheKey( /*...*/ ) {
  93                 if ( $this->hasSharedCache() ) {
  94                         $args = func_get_args();
  95                         array_unshift( $args, $this->wiki );
  96
  97                         return implode( ':', $args );
  98                 } else {
  99                         return false;
 100                 }
 101         }
 102
 103         protected function assertWritableRepo() {
 104                 throw new MWException( get_class( $this ) . ': write operations are not supported.' );
 105         }
 106
 107         public function getInfo() {
 108                 return FileRepo::getInfo();
 109         }
 110 }