content: /*
   * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
   * 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 me.ahoo.cosid.machine;
  
  import lombok.SneakyThrows;
  import lombok.extern.slf4j.Slf4j;
  
  import java.net.Inet4Address;
  import java.net.InetAddress;
  import java.net.NetworkInterface;
  import java.util.Enumeration;
  
  @Slf4j
  public final class LocalHostAddressSupplier implements HostAddressSupplier {
      public static final LocalHostAddressSupplier INSTANCE = new LocalHostAddressSupplier();
      
      @SneakyThrows
      @Override
      public String getHostAddress() {
          String hostAddress = InetAddress.getLocalHost().getHostAddress();
          try {
              Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
              while (networkInterfaces.hasMoreElements()) {
                  NetworkInterface eachNetworkInterface = networkInterfaces.nextElement();
                  if (!eachNetworkInterface.isUp() || eachNetworkInterface.isLoopback()) {
                      continue;
                  }
                  Enumeration<InetAddress> inetAddresses = eachNetworkInterface.getInetAddresses();
                  while (inetAddresses.hasMoreElements()) {
                      InetAddress inetAddress = inetAddresses.nextElement();
                      if (inetAddress instanceof Inet4Address
                          && !inetAddress.isLoopbackAddress()
                          && !inetAddress.isAnyLocalAddress()
                      ) {
                          hostAddress = inetAddress.getHostAddress();
                      }
                  }
              }
          } catch (Exception ex) {
              log.error("Cannot get first non-loopback address", ex);
          }
          return hostAddress;
      }
  }
  