<?php
/**
 * This script reports the hostname of a slave server.
 *
 * 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
 *
 * @ingroup Maintenance
 */
 
require_once( dirname(__FILE__) . '/Maintenance.php' );

class GetSlaveServer extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->addOption( "group", "Query group to check specifically" );
		$this->mDescription = "Report the hostname of a slave server";
	}
	public function execute() {
		global $wgAllDBsAreLocalhost;
		if( $wgAllDBsAreLocalhost ) {
			$host = 'localhost';
		} else {
			if( $this->hasOption('group') ) {
				$db = wfGetDB( DB_SLAVE, $this->getOption('group') );
				$host = $db->getServer();
			} else {
				$lb = wfGetLB();
				$i = $lb->getReaderIndex();
				$host = $lb->getServerName( $i );
			}
		}
		$this->output( "$host\n" );
	}
}

$maintClass = "GetSlaveServer";
require_once( DO_MAINTENANCE );