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.remote.rpc.handler;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.naming.pojo.ServiceInfo;
  import com.alibaba.nacos.api.naming.remote.request.SubscribeServiceRequest;
  import com.alibaba.nacos.api.naming.remote.response.SubscribeServiceResponse;
  import com.alibaba.nacos.api.naming.utils.NamingUtils;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.api.remote.response.ResponseCode;
  import com.alibaba.nacos.auth.annotation.Secured;
  import com.alibaba.nacos.common.notify.NotifyCenter;
  import com.alibaba.nacos.common.trace.event.naming.SubscribeServiceTraceEvent;
  import com.alibaba.nacos.common.trace.event.naming.UnsubscribeServiceTraceEvent;
  import com.alibaba.nacos.core.context.RequestContextHolder;
  import com.alibaba.nacos.core.control.TpsControl;
  import com.alibaba.nacos.core.namespace.filter.NamespaceValidation;
  import com.alibaba.nacos.core.paramcheck.ExtractorManager;
  import com.alibaba.nacos.core.paramcheck.impl.SubscribeServiceRequestParamExtractor;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.naming.core.v2.index.ServiceStorage;
  import com.alibaba.nacos.naming.core.v2.metadata.NamingMetadataManager;
  import com.alibaba.nacos.naming.core.v2.pojo.Service;
  import com.alibaba.nacos.naming.core.v2.service.impl.EphemeralClientOperationServiceImpl;
  import com.alibaba.nacos.naming.pojo.Subscriber;
  import com.alibaba.nacos.naming.utils.NamingRequestUtil;
  import com.alibaba.nacos.naming.utils.ServiceUtil;
  import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
  import org.springframework.stereotype.Component;
  
  /**
   * Handler to handle subscribe service.
   *
   * @author liuzunfei
   * @author xiweng.yy
   */
  @Component
  public class SubscribeServiceRequestHandler extends RequestHandler<SubscribeServiceRequest, SubscribeServiceResponse> {
      
      private final ServiceStorage serviceStorage;
      
      private final NamingMetadataManager metadataManager;
      
      private final EphemeralClientOperationServiceImpl clientOperationService;
      
      public SubscribeServiceRequestHandler(ServiceStorage serviceStorage, NamingMetadataManager metadataManager,
              EphemeralClientOperationServiceImpl clientOperationService) {
          this.serviceStorage = serviceStorage;
          this.metadataManager = metadataManager;
          this.clientOperationService = clientOperationService;
      }
      
      @Override
      @NamespaceValidation
      @TpsControl(pointName = "RemoteNamingServiceSubscribeUnSubscribe", name = "RemoteNamingServiceSubscribeUnsubscribe")
      @Secured(action = ActionTypes.READ)
      @ExtractorManager.Extractor(rpcExtractor = SubscribeServiceRequestParamExtractor.class)
      public SubscribeServiceResponse handle(SubscribeServiceRequest request, RequestMeta meta) throws NacosException {
          String namespaceId = request.getNamespace();
          String serviceName = request.getServiceName();
          String groupName = request.getGroupName();
          String app = RequestContextHolder.getContext().getBasicContext().getApp();
          String groupedServiceName = NamingUtils.getGroupedName(serviceName, groupName);
          Service service = Service.newService(namespaceId, groupName, serviceName, true);
          Subscriber subscriber = new Subscriber(meta.getClientIp(), meta.getClientVersion(), app, meta.getClientIp(),
                  namespaceId, groupedServiceName, 0, request.getClusters());
          ServiceInfo serviceInfo = ServiceUtil.selectInstancesWithHealthyProtection(serviceStorage.getData(service),
                  metadataManager.getServiceMetadata(service).orElse(null), subscriber.getCluster(), false, true,
                  subscriber.getIp());
          if (request.isSubscribe()) {
              clientOperationService.subscribeService(service, subscriber, meta.getConnectionId());
              NotifyCenter.publishEvent(new SubscribeServiceTraceEvent(System.currentTimeMillis(),
                      NamingRequestUtil.getSourceIpForGrpcRequest(meta), service.getNamespace(), service.getGroup(),
                      service.getName()));
          } else {
              clientOperationService.unsubscribeService(service, subscriber, meta.getConnectionId());
              NotifyCenter.publishEvent(new UnsubscribeServiceTraceEvent(System.currentTimeMillis(),
                      NamingRequestUtil.getSourceIpForGrpcRequest(meta), service.getNamespace(), service.getGroup(),
                      service.getName()));
          }
          return new SubscribeServiceResponse(ResponseCode.SUCCESS.getCode(), "success", serviceInfo);
      }
  }
  