content: /*
   * Copyright 1999-2022 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.core.remote.grpc;
  
  import io.grpc.Context;
  import io.grpc.Contexts;
  import io.grpc.Metadata;
  import io.grpc.ServerCall;
  import io.grpc.ServerCallHandler;
  import io.grpc.ServerInterceptor;
  import io.grpc.internal.ServerStream;
  import io.grpc.internal.ServerStreamHelper;
  import io.grpc.netty.shaded.io.grpc.netty.NettyChannelHelper;
  import io.grpc.netty.shaded.io.netty.channel.Channel;
  
  /**
   * GrpcConnectionInterceptor set connection.
   *
   * @author Weizhan▪Yun
   * @date 2023/1/5 16:05
   */
  public class GrpcConnectionInterceptor implements ServerInterceptor {
      
      @Override
      public <T, S> ServerCall.Listener<T> interceptCall(ServerCall<T, S> call, Metadata headers,
              ServerCallHandler<T, S> next) {
          Context ctx = Context.current().withValue(GrpcServerConstants.CONTEXT_KEY_CONN_ID,
                          call.getAttributes().get(GrpcServerConstants.ATTR_TRANS_KEY_CONN_ID))
                  .withValue(GrpcServerConstants.CONTEXT_KEY_CONN_REMOTE_IP,
                          call.getAttributes().get(GrpcServerConstants.ATTR_TRANS_KEY_REMOTE_IP))
                  .withValue(GrpcServerConstants.CONTEXT_KEY_CONN_REMOTE_PORT,
                          call.getAttributes().get(GrpcServerConstants.ATTR_TRANS_KEY_REMOTE_PORT))
                  .withValue(GrpcServerConstants.CONTEXT_KEY_CONN_LOCAL_PORT,
                          call.getAttributes().get(GrpcServerConstants.ATTR_TRANS_KEY_LOCAL_PORT));
          if (GrpcServerConstants.REQUEST_BI_STREAM_SERVICE_NAME.equals(call.getMethodDescriptor().getServiceName())) {
              Channel internalChannel = getInternalChannel(call);
              ctx = ctx.withValue(GrpcServerConstants.CONTEXT_KEY_CHANNEL, internalChannel);
          }
          
          return Contexts.interceptCall(ctx, call, headers, next);
      }
      
      private Channel getInternalChannel(ServerCall serverCall) {
          ServerStream serverStream = ServerStreamHelper.getServerStream(serverCall);
          return NettyChannelHelper.getChannel(serverStream);
      }
  }
  