content: /*
   * 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.nacos.naming.cluster;
  
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.core.distributed.ProtocolManager;
  import com.alibaba.nacos.core.distributed.distro.DistroProtocol;
  import com.alibaba.nacos.naming.misc.GlobalConfig;
  import com.alibaba.nacos.naming.misc.GlobalExecutor;
  import com.alibaba.nacos.naming.misc.SwitchDomain;
  import org.springframework.stereotype.Service;
  
  import javax.annotation.PostConstruct;
  import java.util.Optional;
  
  /**
   * Detect and control the working status of local server.
   *
   * @author nkorange
   * @since 1.0.0
   */
  @Service
  public class ServerStatusManager {
      
      private final GlobalConfig globalConfig;
      
      private final DistroProtocol distroProtocol;
      
      private final ProtocolManager protocolManager;
      
      private final SwitchDomain switchDomain;
      
      private ServerStatus serverStatus = ServerStatus.STARTING;
      
      public ServerStatusManager(GlobalConfig globalConfig, DistroProtocol distroProtocol,
              ProtocolManager protocolManager, SwitchDomain switchDomain) {
          this.globalConfig = globalConfig;
          this.distroProtocol = distroProtocol;
          this.protocolManager = protocolManager;
          this.switchDomain = switchDomain;
      }
      
      @PostConstruct
      public void init() {
          GlobalExecutor.registerServerStatusUpdater(new ServerStatusUpdater());
      }
      
      private void refreshServerStatus() {
          if (StringUtils.isNotBlank(switchDomain.getOverriddenServerStatus())) {
              serverStatus = ServerStatus.valueOf(switchDomain.getOverriddenServerStatus());
              return;
          }
          
          if (isReady()) {
              serverStatus = ServerStatus.UP;
          } else {
              serverStatus = ServerStatus.DOWN;
          }
      }
      
      private boolean isReady() {
          if (!globalConfig.isDataWarmup()) {
              return true;
          }
          if (!protocolManager.isCpInit() || protocolManager.getCpProtocol() == null) {
              return false;
          }
          return protocolManager.getCpProtocol().isReady() && distroProtocol.isInitialized();
      }
      
      public ServerStatus getServerStatus() {
          return serverStatus;
      }
      
      public Optional<String> getErrorMsg() {
          if (isReady()) {
              return Optional.empty();
          }
          if (!distroProtocol.isInitialized()) {
              return Optional.of(
                      "Distro snapshot load failed, please see logs `protocol-distro.log` or `naming-distro.log` to see details.");
          }
          return Optional.of(
                  "No leader for raft, please see logs `alipay-jraft.log` or `naming-raft.log` to see details.");
      }
      
      public class ServerStatusUpdater implements Runnable {
          
          @Override
          public void run() {
              refreshServerStatus();
          }
      }
  }
  