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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.
 */
package com.alibaba.csp.sentinel.util;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

import com.alibaba.csp.sentinel.log.RecordLog;

/**
 * Get host name and ip of the host.
 *
 * @author leyou
 */
public final class HostNameUtil {

    private static String ip;
    private static String hostName;

    static {
        try {
            // Init the host information.
            resolveHost();
        } catch (Exception e) {
            RecordLog.info("Failed to get local host", e);
        }
    }

    private static void resolveHost() throws Exception {
        InetAddress addr = InetAddress.getLocalHost();
        hostName = addr.getHostName();
        ip = addr.getHostAddress();
        if (addr.isLoopbackAddress()) {
            // find the first IPv4 Address that not loopback
            Enumeration interfaces = NetworkInterface.getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface in = interfaces.nextElement();
                Enumeration addrs = in.getInetAddresses();
                while (addrs.hasMoreElements()) {
                    InetAddress address = addrs.nextElement();
                    if (!address.isLoopbackAddress() && address instanceof Inet4Address) {
                        ip = address.getHostAddress();
                    }
                }
            }
        }
    }

    public static String getIp() {
        return ip;
    }

    public static String getHostName() {
        return hostName;
    }

    public static String getConfigString() {
        return "{\n"
            + "\t\"machine\": \"" + hostName + "\",\n"
            + "\t\"ip\": \"" + ip + "\"\n"
            + "}";
    }

    private HostNameUtil() {}
}