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| 1 | <?php |
| 2 | |
| 3 | namespace Flow; |
| 4 | |
| 5 | use MediaWiki\MediaWikiServices; |
| 6 | use Wikimedia\Rdbms\DBReplicationWaitError; |
| 7 | use Wikimedia\Rdbms\IDatabase; |
| 8 | use Wikimedia\Rdbms\IReadableDatabase; |
| 9 | |
| 10 | /** |
| 11 | * All classes within Flow that need to access the Flow db will go through |
| 12 | * this class. Having it separated into an object greatly simplifies testing |
| 13 | * anything that needs to talk to the database. |
| 14 | * |
| 15 | * The factory receives, in its constructor, the wiki name and cluster name |
| 16 | * that Flow-specific data is stored on. Multiple wiki's can and should be |
| 17 | * using the same wiki name and cluster to share Flow-specific data. These values |
| 18 | * are used. |
| 19 | * |
| 20 | * There are also get getWikiLB and getWikiDB for the main wiki database. |
| 21 | */ |
| 22 | class DbFactory { |
| 23 | /** |
| 24 | * @var string|false Wiki ID, or false for the current wiki |
| 25 | */ |
| 26 | protected $wiki; |
| 27 | |
| 28 | /** |
| 29 | * @var string|false External storage cluster, or false for core |
| 30 | */ |
| 31 | protected $cluster; |
| 32 | |
| 33 | /** |
| 34 | * @var bool When true only DB_PRIMARY will be returned |
| 35 | */ |
| 36 | protected $forcePrimary = false; |
| 37 | |
| 38 | /** |
| 39 | * @param string|false $wiki Wiki ID, or false for the current wiki |
| 40 | * @param string|false $cluster External storage cluster, or false for core |
| 41 | */ |
| 42 | public function __construct( $wiki, $cluster ) { |
| 43 | $this->wiki = $wiki; |
| 44 | $this->cluster = $cluster; |
| 45 | } |
| 46 | |
| 47 | public function forcePrimary() { |
| 48 | $this->forcePrimary = true; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Gets a database connection for the Flow-specific database. |
| 53 | * |
| 54 | * @param int $db index of the connection to get. DB_PRIMARY|DB_REPLICA. |
| 55 | * @return IDatabase|IReadableDatabase |
| 56 | */ |
| 57 | public function getDB( $db ) { |
| 58 | return $this->getLB()->getConnection( $this->forcePrimary ? DB_PRIMARY : $db, [], $this->wiki ); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Gets a load balancer for the Flow-specific database. |
| 63 | * |
| 64 | * @return \Wikimedia\Rdbms\ILoadBalancer |
| 65 | */ |
| 66 | private function getLB() { |
| 67 | $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory(); |
| 68 | if ( $this->cluster !== false ) { |
| 69 | return $lbFactory->getExternalLB( $this->cluster ); |
| 70 | } else { |
| 71 | return $lbFactory->getMainLB( $this->wiki ); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Gets a database connection for the main wiki database. Mockable version of wfGetDB. |
| 77 | * |
| 78 | * @param int $db index of the connection to get. DB_PRIMARY|DB_REPLICA. |
| 79 | * @param string|bool $wiki The wiki ID, or false for the current wiki |
| 80 | * @return IDatabase|IReadableDatabase |
| 81 | */ |
| 82 | public function getWikiDB( $db, $wiki = false ) { |
| 83 | $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory(); |
| 84 | return $lbFactory->getMainLB( $wiki )->getConnection( $this->forcePrimary ? DB_PRIMARY : $db, [], $wiki ); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Wait for the replicas of the Flow database |
| 89 | */ |
| 90 | public function waitForReplicas() { |
| 91 | $lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory(); |
| 92 | try { |
| 93 | $lbFactory->waitForReplication( [ |
| 94 | 'wiki' => $this->wiki, |
| 95 | 'cluster' => $this->cluster, |
| 96 | 'ifWritesSince' => false |
| 97 | ] ); |
| 98 | } catch ( DBReplicationWaitError $e ) { |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | } |