ons-core/ons-trace-core/src/main/java/org/apache/rocketmq/ons/open/trace/core/utils/MixUtils.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.rocketmq.ons.open.trace.core.utils;

import org.apache.rocketmq.remoting.protocol.RemotingSerializable;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Enumeration;

public class MixUtils {
    public static String getLocalAddress() {
        try {

            Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();
            ArrayList<String> ipv4Result = new ArrayList<String>();
            ArrayList<String> ipv6Result = new ArrayList<String>();
            while (enumeration.hasMoreElements()) {
                final NetworkInterface networkInterface = enumeration.nextElement();
                final Enumeration<InetAddress> en = networkInterface.getInetAddresses();
                while (en.hasMoreElements()) {
                    final InetAddress address = en.nextElement();
                    if (!address.isLoopbackAddress()) {
                        if (address instanceof Inet6Address) {
                            ipv6Result.add(normalizeHostAddress(address));
                        }
                        else {
                            ipv4Result.add(normalizeHostAddress(address));
                        }
                    }
                }
            }


            if (!ipv4Result.isEmpty()) {
                for (String ip : ipv4Result) {
                    if (ip.startsWith("127.0") || ip.startsWith("192.168")) {
                        continue;
                    }

                    return ip;
                }


                return ipv4Result.get(ipv4Result.size() - 1);
            }

            else if (!ipv6Result.isEmpty()) {
                return ipv6Result.get(0);
            }

            final InetAddress localHost = InetAddress.getLocalHost();
            return normalizeHostAddress(localHost);
        }
        catch (SocketException e) {
            e.printStackTrace();
        }
        catch (UnknownHostException e) {
            e.printStackTrace();
        }
        finally {

        }

        return null;
    }


    public static String normalizeHostAddress(final InetAddress localHost) {
        if (localHost instanceof Inet6Address) {
            return "[" + localHost.getHostAddress() + "]";
        }
        else {
            return localHost.getHostAddress();
        }
    }


    public static String toJson(final Object obj, boolean prettyFormat) {
        return RemotingSerializable.toJson(obj, prettyFormat);
    }


    public static <T> T fromJson(String json, Class<T> classOfT) {
        return RemotingSerializable.fromJson(json, classOfT);
    }


    public static String replaceNull(String ori) {
        return ori == null ? "" : ori;
    }
}