1 files changed, 80 insertions, 0 deletions
diff --git a/www/wiki/includes/libs/rdbms/loadbalancer/LoadBalancerSingle.php b/www/wiki/includes/libs/rdbms/loadbalancer/LoadBalancerSingle.php
new file mode 100644
index 00000000..be80cc5e
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+++ b/www/wiki/includes/libs/rdbms/loadbalancer/LoadBalancerSingle.php
@@ -0,0 +1,80 @@
+<?php
+/**
+ * Simple generator of database connections that always returns the same object.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Database
+ */
+
+namespace Wikimedia\Rdbms;
+
+use InvalidArgumentException;
+
+/**
+ * Trivial LoadBalancer that always returns an injected connection handle
+ */
+class LoadBalancerSingle extends LoadBalancer {
+	/** @var IDatabase */
+	private $db;
+
+	/**
+	 * @param array $params An associative array with one member:
+	 *   - connection: An IDatabase connection object
+	 */
+	public function __construct( array $params ) {
+		if ( !isset( $params['connection'] ) ) {
+			throw new InvalidArgumentException( "Missing 'connection' argument." );
+		}
+
+		$this->db = $params['connection'];
+
+		parent::__construct( [
+			'servers' => [
+				[
+					'type' => $this->db->getType(),
+					'host' => $this->db->getServer(),
+					'dbname' => $this->db->getDBname(),
+					'load' => 1,
+				]
+			],
+			'trxProfiler' => isset( $params['trxProfiler'] ) ? $params['trxProfiler'] : null,
+			'srvCache' => isset( $params['srvCache'] ) ? $params['srvCache'] : null,
+			'wanCache' => isset( $params['wanCache'] ) ? $params['wanCache'] : null
+		] );
+
+		if ( isset( $params['readOnlyReason'] ) ) {
+			$this->db->setLBInfo( 'readOnlyReason', $params['readOnlyReason'] );
+		}
+	}
+
+	/**
+	 * @param IDatabase $db Live connection handle
+	 * @param array $params Parameter map to LoadBalancerSingle::__constructs()
+	 * @return LoadBalancerSingle
+	 * @since 1.28
+	 */
+	public static function newFromConnection( IDatabase $db, array $params = [] ) {
+		return new static( [ 'connection' => $db ] + $params );
+	}
+
+	protected function reallyOpenConnection( array $server, DatabaseDomain $domainOverride ) {
+		return $this->db;
+	}
+}
+
+class_alias( LoadBalancerSingle::class, 'LoadBalancerSingle' );