1 files changed, 155 insertions, 0 deletions
diff --git a/www/wiki/includes/libs/rdbms/connectionmanager/ConnectionManager.php b/www/wiki/includes/libs/rdbms/connectionmanager/ConnectionManager.php
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+++ b/www/wiki/includes/libs/rdbms/connectionmanager/ConnectionManager.php
@@ -0,0 +1,155 @@
+<?php
+/**
+ * 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;
+
+/**
+ * Database connection manager.
+ *
+ * This manages access to master and replica databases.
+ *
+ * @since 1.29
+ *
+ * @author Addshore
+ */
+class ConnectionManager {
+
+	/**
+	 * @var LoadBalancer
+	 */
+	private $loadBalancer;
+
+	/**
+	 * The symbolic name of the target database, or false for the local wiki's database.
+	 *
+	 * @var string|false
+	 */
+	private $domain;
+
+	/**
+	 * @var string[]
+	 */
+	private $groups = [];
+
+	/**
+	 * @param LoadBalancer $loadBalancer
+	 * @param string|bool $domain Optional logical DB name, defaults to current wiki.
+	 *        This follows the convention for database names used by $loadBalancer.
+	 * @param string[] $groups see LoadBalancer::getConnection
+	 *
+	 * @throws InvalidArgumentException
+	 */
+	public function __construct( LoadBalancer $loadBalancer, $domain = false, array $groups = [] ) {
+		if ( !is_string( $domain ) && $domain !== false ) {
+			throw new InvalidArgumentException( '$dbName must be a string, or false.' );
+		}
+
+		$this->loadBalancer = $loadBalancer;
+		$this->domain = $domain;
+		$this->groups = $groups;
+	}
+
+	/**
+	 * @param int $i
+	 * @param string[]|null $groups
+	 *
+	 * @return Database
+	 */
+	private function getConnection( $i, array $groups = null ) {
+		$groups = $groups === null ? $this->groups : $groups;
+		return $this->loadBalancer->getConnection( $i, $groups, $this->domain );
+	}
+
+	/**
+	 * @param int $i
+	 * @param string[]|null $groups
+	 *
+	 * @return DBConnRef
+	 */
+	private function getConnectionRef( $i, array $groups = null ) {
+		$groups = $groups === null ? $this->groups : $groups;
+		return $this->loadBalancer->getConnectionRef( $i, $groups, $this->domain );
+	}
+
+	/**
+	 * Returns a connection to the master DB, for updating. The connection should later be released
+	 * by calling releaseConnection().
+	 *
+	 * @since 1.29
+	 *
+	 * @return Database
+	 */
+	public function getWriteConnection() {
+		return $this->getConnection( DB_MASTER );
+	}
+
+	/**
+	 * Returns a database connection for reading. The connection should later be released by
+	 * calling releaseConnection().
+	 *
+	 * @since 1.29
+	 *
+	 * @param string[]|null $groups
+	 *
+	 * @return Database
+	 */
+	public function getReadConnection( array $groups = null ) {
+		$groups = $groups === null ? $this->groups : $groups;
+		return $this->getConnection( DB_REPLICA, $groups );
+	}
+
+	/**
+	 * @since 1.29
+	 *
+	 * @param IDatabase $db
+	 */
+	public function releaseConnection( IDatabase $db ) {
+		$this->loadBalancer->reuseConnection( $db );
+	}
+
+	/**
+	 * Returns a connection ref to the master DB, for updating.
+	 *
+	 * @since 1.29
+	 *
+	 * @return DBConnRef
+	 */
+	public function getWriteConnectionRef() {
+		return $this->getConnectionRef( DB_MASTER );
+	}
+
+	/**
+	 * Returns a database connection ref for reading.
+	 *
+	 * @since 1.29
+	 *
+	 * @param string[]|null $groups
+	 *
+	 * @return DBConnRef
+	 */
+	public function getReadConnectionRef( array $groups = null ) {
+		$groups = $groups === null ? $this->groups : $groups;
+		return $this->getConnectionRef( DB_REPLICA, $groups );
+	}
+
+}