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<?php
namespace SMW\MediaWiki\Connection;
use Psr\Log\LoggerAwareTrait;
use RuntimeException;
use SMW\Connection\ConnectionProvider as IConnectionProvider;
use SMW\Connection\ConnectionProviderRef;
/**
* @license GNU GPL v2+
* @since 2.1
*
* @author mwjames
*/
class ConnectionProvider implements IConnectionProvider {
use LoggerAwareTrait;
/**
* @var string
*/
private $provider;
/**
* @var Database
*/
private $connection;
/**
* @var array
*/
private $localConnectionConf = [];
/**
* @since 3.0
*
* @param string|null $provider
*/
public function __construct( $provider = null ) {
$this->provider = $provider;
}
/**
* @see #2532
*
* @param array $localConnectionConf
*
* @since 3.0
*/
public function setLocalConnectionConf( array $localConnectionConf ) {
$this->localConnectionConf = $localConnectionConf;
}
/**
* @see IConnectionProvider::getConnection
*
* @since 2.1
*
* @return Database
*/
public function getConnection() {
if ( $this->connection !== null ) {
return $this->connection;
}
// Default configuration
$conf = [
'read' => DB_SLAVE,
'write' => DB_MASTER
];
if ( isset( $this->localConnectionConf[$this->provider] ) ) {
$conf = $this->localConnectionConf[$this->provider];
}
return $this->connection = $this->createConnection( $conf );
}
/**
* @see IConnectionProvider::releaseConnection
*
* @since 2.1
*/
public function releaseConnection() {
if ( $this->connection !== null ) {
$this->connection->releaseConnection();
}
$this->connection = null;
}
private function createConnection( $conf ) {
if ( isset( $conf['callback'] ) && is_callable( $conf['callback'] ) ) {
return call_user_func( $conf['callback'] );
}
if ( !isset( $conf['read'] ) || !isset( $conf['write'] ) ) {
throw new RuntimeException( "The configuration is incomplete (requires a `read` and `write` identifier)." );
}
$connectionProviders = [];
$connectionProviders['read'] = new LoadBalancerConnectionProvider(
$conf['read']
);
if ( $conf['read'] === $conf['write'] ) {
$connectionProviders['write'] = $connectionProviders['read'];
} else {
$connectionProviders['write'] = new LoadBalancerConnectionProvider(
$conf['write']
);
}
$transactionProfiler = new TransactionProfiler(
\Profiler::instance()->getTransactionProfiler()
);
$transactionProfiler->silenceTransactionProfiler();
$connection = new Database(
new ConnectionProviderRef( $connectionProviders )
);
$connection->setTransactionProfiler(
$transactionProfiler
);
// Only required because of SQlite
$connection->setDBPrefix( $GLOBALS['wgDBprefix'] );
$this->logger->info(
[
'Connection',
'{provider}: {conf}',
],
[
'role' => 'developer',
'provider' => $this->provider,
'conf' => [
'read' => $conf['read'] === DB_SLAVE ? 'DB_SLAVE' : 'DB_MASTER',
'write' => $conf['write'] === DB_SLAVE ? 'DB_SLAVE' : 'DB_MASTER',
]
]
);
return $connection;
}
}
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