content: /*
   * Copyright 1999-2023 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.remote.request.NamingFuzzyWatchRequest;
  import com.alibaba.nacos.api.naming.remote.response.NamingFuzzyWatchResponse;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.auth.annotation.Secured;
  import com.alibaba.nacos.common.notify.NotifyCenter;
  import com.alibaba.nacos.core.remote.RequestHandler;
  import com.alibaba.nacos.naming.core.v2.event.client.ClientOperationEvent;
  import com.alibaba.nacos.naming.core.v2.index.NamingFuzzyWatchContextService;
  import com.alibaba.nacos.plugin.auth.constant.ActionTypes;
  import org.springframework.stereotype.Component;
  
  import static com.alibaba.nacos.api.common.Constants.WATCH_TYPE_CANCEL_WATCH;
  import static com.alibaba.nacos.api.common.Constants.WATCH_TYPE_WATCH;
  import static com.alibaba.nacos.api.model.v2.ErrorCode.FUZZY_WATCH_PATTERN_MATCH_COUNT_OVER_LIMIT;
  
  /**
   * Fuzzy watch service request handler.
   *
   * @author tanyongquan
   */
  @Component("namingFuzzyWatchRequestHandler")
  public class NamingFuzzyWatchRequestHandler extends RequestHandler<NamingFuzzyWatchRequest, NamingFuzzyWatchResponse> {
      
      private NamingFuzzyWatchContextService namingFuzzyWatchContextService;
      
      public NamingFuzzyWatchRequestHandler(NamingFuzzyWatchContextService namingFuzzyWatchContextService) {
          this.namingFuzzyWatchContextService = namingFuzzyWatchContextService;
          NotifyCenter.registerToPublisher(ClientOperationEvent.ClientFuzzyWatchEvent.class, 1000);
          
      }
      
      @Override
      @Secured(action = ActionTypes.READ)
      public NamingFuzzyWatchResponse handle(NamingFuzzyWatchRequest request, RequestMeta meta) throws NacosException {
          
          String groupKeyPattern = request.getGroupKeyPattern();
          switch (request.getWatchType()) {
              case WATCH_TYPE_WATCH:
                  try {
                      namingFuzzyWatchContextService.syncFuzzyWatcherContext(groupKeyPattern, meta.getConnectionId());
                      NotifyCenter.publishEvent(
                              new ClientOperationEvent.ClientFuzzyWatchEvent(groupKeyPattern, meta.getConnectionId(),
                                      request.getReceivedGroupKeys(), request.isInitializing()));
                  } catch (NacosException nacosException) {
                      NamingFuzzyWatchResponse namingFuzzyWatchResponse = new NamingFuzzyWatchResponse();
                      namingFuzzyWatchResponse.setErrorInfo(nacosException.getErrCode(), nacosException.getErrMsg());
                      return namingFuzzyWatchResponse;
                  }
                  
                  boolean reachToUpLimit = namingFuzzyWatchContextService.reachToUpLimit(groupKeyPattern);
                  if (reachToUpLimit) {
                      NamingFuzzyWatchResponse namingFuzzyWatchResponse = new NamingFuzzyWatchResponse();
                      namingFuzzyWatchResponse.setErrorInfo(FUZZY_WATCH_PATTERN_MATCH_COUNT_OVER_LIMIT.getCode(),
                              FUZZY_WATCH_PATTERN_MATCH_COUNT_OVER_LIMIT.getMsg());
                      return namingFuzzyWatchResponse;
                  }
                  
                  return NamingFuzzyWatchResponse.buildSuccessResponse();
              case WATCH_TYPE_CANCEL_WATCH:
                  namingFuzzyWatchContextService.removeFuzzyWatchContext(groupKeyPattern, meta.getConnectionId());
                  return NamingFuzzyWatchResponse.buildSuccessResponse();
              default:
                  throw new NacosException(NacosException.INVALID_PARAM,
                          String.format("Unsupported request type %s", request.getWatchType()));
          }
      }
  }
  