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<?php
namespace MediaWiki\Extension\Notifications;
use MediaWiki\MediaWikiServices;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\ILoadBalancer;
/**
* Database factory class, this will determine whether to use the main database
* or an external database defined in the configuration file
*/
class DbFactory {
/**
* The cluster for the database
* @var string|false
*/
private $cluster;
/** @var string|false */
private $shared;
/** @var string|false */
private $sharedCluster;
/**
* @param string|false $cluster
* @param string|false $shared
* @param string|false $sharedCluster
*/
public function __construct( $cluster = false, $shared = false, $sharedCluster = false ) {
$this->cluster = $cluster;
$this->shared = $shared;
$this->sharedCluster = $sharedCluster;
}
/**
* Create a db factory instance from default Echo configuration
* A singleton is not necessary because it's actually handled
* inside core database object
*
* @return DbFactory
*/
public static function newFromDefault() {
global $wgEchoCluster, $wgEchoSharedTrackingDB, $wgEchoSharedTrackingCluster;
return new self( $wgEchoCluster, $wgEchoSharedTrackingDB, $wgEchoSharedTrackingCluster );
}
/**
* @return bool
*/
public function isReadOnly() {
return ( $this->getLB()->getReadOnlyReason() !== false );
}
/**
* Get the database load balancer
* @return ILoadBalancer
*/
protected function getLB() {
// Use the external db defined for Echo
if ( $this->cluster ) {
$lb = MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->getExternalLB( $this->cluster );
} else {
$lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
}
return $lb;
}
/**
* @return ILoadBalancer
*/
protected function getSharedLB() {
if ( $this->sharedCluster ) {
$lb = MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->getExternalLB( $this->sharedCluster );
} else {
$lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
}
return $lb;
}
/**
* Get the database connection for Echo
* @param int $db Index of the connection to get
* @param string[] $groups Query groups.
* @return IDatabase
*/
public function getEchoDb( $db, array $groups = [] ) {
return $this->getLB()->getConnection( $db, $groups );
}
/**
* @param int $db Index of the connection to get
* @param string[] $groups Query groups
*
* @return bool|IDatabase false if no shared db is configured
*/
public function getSharedDb( $db, array $groups = [] ) {
if ( !$this->shared ) {
return false;
}
return $this->getSharedLB()->getConnection( $db, $groups, $this->shared );
}
/**
* Wrapper function for LBFactory::getExternalLB/getMainLB, some extensions like MobileFrontend is
* using this to issue sql queries against Echo database directly. This
* is totally not accepted and should be updated to use Echo database access
* objects
*
* @deprecated Use newFromDefault() instead to create a db factory
* @param int $db Index of the connection to get
* @param string[] $groups Query groups.
* @param string|bool $wiki The wiki ID, or false for the current wiki
* @return IDatabase
*/
public static function getDB( $db, array $groups = [], $wiki = false ) {
global $wgEchoCluster;
$services = MediaWikiServices::getInstance();
// Use the external db defined for Echo
if ( $wgEchoCluster ) {
$lb = $services->getDBLoadBalancerFactory()->getExternalLB( $wgEchoCluster );
} else {
if ( $wiki === false ) {
$lb = $services->getDBLoadBalancer();
} else {
$lb = $services->getDBLoadBalancerFactory()->getMainLB( $wiki );
}
}
return $lb->getConnection( $db, $groups, $wiki );
}
/**
* Check whether it makes sense to retry a failed lookup on the primary database.
* @return bool True if there are multiple servers and changes were made in this request; false otherwise
*/
public function canRetryPrimary() {
return $this->getLB()->getServerCount() > 1 && $this->getLB()->hasOrMadeRecentPrimaryChanges();
}
}
class_alias( DbFactory::class, 'MWEchoDbFactory' );