/*
 * AutoPublicAddress.cpp
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "flow/Platform.h"
#include <algorithm>

#define BOOST_SYSTEM_NO_LIB
#define BOOST_DATE_TIME_NO_LIB
#define BOOST_REGEX_NO_LIB
#include "boost/asio.hpp"

#include "fdbclient/CoordinationInterface.h"

IPAddress determinePublicIPAutomatically(ClusterConnectionString const& ccs) {
	try {
		using namespace boost::asio;

		io_service ioService;
		ip::udp::socket socket(ioService);

		const auto& coordAddr = ccs.coordinators()[0];
		const auto boostIp = coordAddr.ip.isV6() ? ip::address(ip::address_v6(coordAddr.ip.toV6()))
		                                         : ip::address(ip::address_v4(coordAddr.ip.toV4()));

		ip::udp::endpoint endpoint(boostIp, coordAddr.port);
		socket.connect(endpoint);
		IPAddress ip = coordAddr.ip.isV6() ? IPAddress(socket.local_endpoint().address().to_v6().to_bytes())
		                                   : IPAddress(socket.local_endpoint().address().to_v4().to_ulong());
		socket.close();

		return ip;
	} catch (boost::system::system_error e) {
		fprintf(stderr, "Error determining public address: %s\n", e.what());
		throw bind_failed();
	}
}