Add master-slave plugin

plugins/master-slave.php

@@ -0,0 +1,43 @@
+<?php
+
+/** Execute writes on master and reads on slave
+* @link http://www.adminer.org/plugins/#use
+* @author Jakub Vrana, http://www.vrana.cz/
+* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
+* @license http://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
+*/
+class AdminerMasterSlave {
+	private $masters = array();
+	
+	/** 
+	* @param array ($slave => $master)
+	*/
+	function AdminerMasterSlave($masters) {
+		$this->masters = $masters;
+	}
+	
+	function credentials() {
+		if ($_POST && isset($this->masters[SERVER])) {
+			return array($this->masters[SERVER], $_GET["username"], get_session("pwds"));
+		}
+	}
+	
+	function login($login, $password) {
+		if (!$_POST && ($master = &$_SESSION["master"])) {
+			$connection = connection();
+			$connection->query("DO MASTER_POS_WAIT('" . q($master['File']) . "', $master[Position])");
+			$master = null;
+		}
+	}
+
+	function messageQuery($query) {
+		//! doesn't work with sql.inc.php
+		$connection = connection();
+		$result = $connection->query('SHOW MASTER STATUS');
+		if ($result) {
+			restart_session();
+			$_SESSION["master"] = $result->fetch_assoc();
+		}
+	}
+
+}