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.remote.RemoteConstants;
  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.core.distributed.distro.DistroProtocol;
  import com.alibaba.nacos.core.distributed.distro.entity.DistroData;
  import com.alibaba.nacos.core.distributed.distro.entity.DistroKey;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.core.remote.grpc.InvokeSource;
  import com.alibaba.nacos.naming.cluster.remote.request.DistroDataRequest;
  import com.alibaba.nacos.naming.cluster.remote.response.DistroDataResponse;
  import com.alibaba.nacos.naming.consistency.ephemeral.distro.v2.DistroClientDataProcessor;
  import com.alibaba.nacos.naming.misc.Loggers;
  import com.alibaba.nacos.plugin.auth.constant.ApiType;
  import org.springframework.stereotype.Component;
  
  /**
   * Distro data request handler.
   *
   * @author xiweng.yy
   */
  @InvokeSource(source = {RemoteConstants.LABEL_SOURCE_CLUSTER})
  @Component
  public class DistroDataRequestHandler extends RequestHandler<DistroDataRequest, DistroDataResponse> {
      
      private final DistroProtocol distroProtocol;
      
      public DistroDataRequestHandler(DistroProtocol distroProtocol) {
          this.distroProtocol = distroProtocol;
      }
      
      @Override
      @Secured(apiType = ApiType.INNER_API)
      public DistroDataResponse handle(DistroDataRequest request, RequestMeta meta) throws NacosException {
          try {
              switch (request.getDataOperation()) {
                  case VERIFY:
                      return handleVerify(request.getDistroData(), meta);
                  case SNAPSHOT:
                      return handleSnapshot();
                  case ADD:
                  case CHANGE:
                  case DELETE:
                      return handleSyncData(request.getDistroData());
                  case QUERY:
                      return handleQueryData(request.getDistroData());
                  default:
                      return new DistroDataResponse();
              }
          } catch (Exception e) {
              Loggers.DISTRO.error("[DISTRO-FAILED] distro handle with exception", e);
              DistroDataResponse result = new DistroDataResponse();
              result.setResultCode(ResponseCode.FAIL.getCode());
              result.setErrorCode(ResponseCode.FAIL.getCode());
              result.setMessage("handle distro request with exception");
              return result;
          }
      }
      
      private DistroDataResponse handleVerify(DistroData distroData, RequestMeta meta) {
          DistroDataResponse result = new DistroDataResponse();
          if (!distroProtocol.onVerify(distroData, meta.getClientIp())) {
              result.setErrorInfo(ResponseCode.FAIL.getCode(), "[DISTRO-FAILED] distro data verify failed");
          }
          return result;
      }
      
      private DistroDataResponse handleSnapshot() {
          DistroDataResponse result = new DistroDataResponse();
          DistroData distroData = distroProtocol.onSnapshot(DistroClientDataProcessor.TYPE);
          result.setDistroData(distroData);
          return result;
      }
      
      private DistroDataResponse handleSyncData(DistroData distroData) {
          DistroDataResponse result = new DistroDataResponse();
          if (!distroProtocol.onReceive(distroData)) {
              result.setErrorCode(ResponseCode.FAIL.getCode());
              result.setMessage("[DISTRO-FAILED] distro data handle failed");
          }
          return result;
      }
      
      private DistroDataResponse handleQueryData(DistroData distroData) {
          DistroDataResponse result = new DistroDataResponse();
          DistroKey distroKey = distroData.getDistroKey();
          DistroData queryData = distroProtocol.onQuery(distroKey);
          result.setDistroData(queryData);
          return result;
      }
  }
  