code: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.skywalking.aop.server.receiver.mesh;
  
  import io.grpc.Status;
  import io.grpc.stub.StreamObserver;
  import org.apache.skywalking.apm.network.servicemesh.v3.MeshProbeDownstream;
  import org.apache.skywalking.apm.network.servicemesh.v3.ServiceMeshMetrics;
  import org.apache.skywalking.apm.network.servicemesh.v3.ServiceMeshMetricServiceGrpc;
  import org.apache.skywalking.oap.server.library.module.ModuleManager;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class MeshGRPCHandler extends ServiceMeshMetricServiceGrpc.ServiceMeshMetricServiceImplBase {
      private static final Logger LOGGER = LoggerFactory.getLogger(MeshGRPCHandler.class);
  
      public MeshGRPCHandler(ModuleManager moduleManager) {
  
      }
  
      @Override
      public StreamObserver<ServiceMeshMetrics> collect(StreamObserver<MeshProbeDownstream> responseObserver) {
          return new StreamObserver<ServiceMeshMetrics>() {
              @Override
              public void onNext(ServiceMeshMetrics metrics) {
                  if (LOGGER.isDebugEnabled()) {
                      LOGGER.debug("Received mesh metrics: {}", metrics);
                  }
  
                  TelemetryDataDispatcher.process(metrics);
              }
  
              @Override
              public void onError(Throwable throwable) {
                  Status status = Status.fromThrowable(throwable);
                  if (Status.CANCELLED.getCode() == status.getCode()) {
                      if (LOGGER.isDebugEnabled()) {
                          LOGGER.debug(throwable.getMessage(), throwable);
                      }
                      return;
                  }
                  LOGGER.error(throwable.getMessage(), throwable);
              }
  
              @Override
              public void onCompleted() {
                  responseObserver.onNext(MeshProbeDownstream.newBuilder().build());
                  responseObserver.onCompleted();
              }
          };
      }
  }
  