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.e2e.controller;
  
  import io.grpc.ManagedChannel;
  import io.grpc.internal.DnsNameResolverProvider;
  import io.grpc.netty.NettyChannelBuilder;
  import io.grpc.stub.StreamObserver;
  import java.util.concurrent.CountDownLatch;
  import org.apache.skywalking.apm.network.common.v3.Commands;
  import org.apache.skywalking.apm.network.language.agent.v3.MeterData;
  import org.apache.skywalking.apm.network.language.agent.v3.MeterDataCollection;
  import org.apache.skywalking.apm.network.language.agent.v3.MeterReportServiceGrpc;
  import org.apache.skywalking.apm.network.language.agent.v3.MeterSingleValue;
  import org.apache.skywalking.e2e.E2EConfiguration;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RestController;
  
  @RestController
  public class MeterMetricSenderController {
      private static final int MAX_INBOUND_MESSAGE_SIZE = 1024 * 1024 * 50;
      private final MeterReportServiceGrpc.MeterReportServiceStub grpcStub;
  
      public MeterMetricSenderController(final E2EConfiguration configuration) {
          final ManagedChannel channel = NettyChannelBuilder.forAddress(
              configuration.getOapHost(), Integer.parseInt(configuration.getOapGrpcPort()))
                                                            .nameResolverFactory(new DnsNameResolverProvider())
                                                            .maxInboundMessageSize(MAX_INBOUND_MESSAGE_SIZE)
                                                            .usePlaintext()
                                                            .build();
  
          grpcStub = MeterReportServiceGrpc.newStub(channel);
      }
  
      @PostMapping("/sendBatchMetrics")
      public String sendBatchMetrics() throws Exception {
          final MeterDataCollection.Builder builder =
              MeterDataCollection.newBuilder()
                                 .addMeterData(MeterData.newBuilder()
                                                        .setService("test-service")
                                                        .setTimestamp(System.currentTimeMillis())
                                                        .setServiceInstance("test-instance")
                                                        .setSingleValue(MeterSingleValue.newBuilder()
                                                                                        .setName("batch_test")
                                                                                        .setValue(100)
                                                                                        .build())
                                                        .build());
  
          sendMetrics(builder.build());
  
          return "Metrics send success!";
      }
  
      @PostMapping("/sendBatchMetrics/{timestamp}/{value}")
      public String sendBatchMetrics(@PathVariable("timestamp") long timestamp, @PathVariable("value") double value) throws Exception {
          final MeterDataCollection.Builder builder =
              MeterDataCollection.newBuilder()
                                 .addMeterData(MeterData.newBuilder()
                                                        .setService("test-service")
                                                        .setTimestamp(timestamp)
                                                        .setServiceInstance("test-instance")
                                                        .setSingleValue(MeterSingleValue.newBuilder()
                                                                                        .setName("batch_test")
                                                                                        .setValue(value)
                                                                                        .build())
                                                        .build());
  
          sendMetrics(builder.build());
  
          return "Metrics send success!";
      }
  
      void sendMetrics(final MeterDataCollection metrics) throws InterruptedException {
          final CountDownLatch latch = new CountDownLatch(1);
  
          StreamObserver<MeterDataCollection> collect = grpcStub.collectBatch(new StreamObserver<Commands>() {
              @Override
              public void onNext(final Commands commands) {
  
              }
  
              @Override
              public void onError(final Throwable throwable) {
                  throwable.printStackTrace();
                  latch.countDown();
              }
  
              @Override
              public void onCompleted() {
                  latch.countDown();
              }
          });
  
          collect.onNext(metrics);
  
          collect.onCompleted();
  
          latch.await();
      }
  }
  