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.oap.server.exporter.provider.grpc;
  
  import io.grpc.ManagedChannel;
  import io.grpc.Server;
  import io.grpc.inprocess.InProcessChannelBuilder;
  import io.grpc.inprocess.InProcessServerBuilder;
  import io.grpc.util.MutableHandlerRegistry;
  import org.apache.skywalking.oap.server.core.analysis.metrics.MetricsMetaInfo;
  import org.apache.skywalking.oap.server.core.analysis.metrics.WithMetadata;
  import org.apache.skywalking.oap.server.core.exporter.ExportData;
  import org.apache.skywalking.oap.server.core.exporter.ExportEvent;
  import org.apache.skywalking.oap.server.core.source.DefaultScopeDefine;
  import org.apache.skywalking.oap.server.exporter.grpc.MetricExportServiceGrpc;
  import org.apache.skywalking.oap.server.exporter.provider.ExporterSetting;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.powermock.reflect.Whitebox;
  
  import java.util.Collections;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.UUID;
  import java.util.concurrent.TimeUnit;
  
  import static org.apache.skywalking.oap.server.core.exporter.ExportEvent.EventType.INCREMENT;
  
  public class GRPCExporterTest {
  
      private GRPCMetricsExporter exporter;
  
      private MetricExportServiceGrpc.MetricExportServiceImplBase service = new MockMetricExportServiceImpl();
      private MetricsMetaInfo metaInfo = new MetricsMetaInfo("mock-metrics", DefaultScopeDefine.SERVICE);
  
      private MetricExportServiceGrpc.MetricExportServiceBlockingStub stub;
  
      private Server server;
      private ManagedChannel channel;
      private MutableHandlerRegistry serviceRegistry;
  
      @BeforeEach
      public void setUp() throws Exception {
          serviceRegistry = new MutableHandlerRegistry();
          final String name = UUID.randomUUID().toString();
          InProcessServerBuilder serverBuilder =
                  InProcessServerBuilder
                          .forName(name)
                          .fallbackHandlerRegistry(serviceRegistry);
  
          server = serverBuilder.build();
          server.start();
  
          channel = InProcessChannelBuilder.forName(name).build();
  
          ExporterSetting setting = new ExporterSetting();
          setting.setGRPCTargetHost("localhost");
          setting.setGRPCTargetPort(9870);
          exporter = new GRPCMetricsExporter(setting);
          serviceRegistry.addService(service);
          stub = MetricExportServiceGrpc.newBlockingStub(channel);
          Whitebox.setInternalState(exporter, "blockingStub", stub);
          exporter.start();
      }
  
      @AfterEach
      public void after() {
          channel.shutdown();
          server.shutdown();
  
          try {
              channel.awaitTermination(1L, TimeUnit.MINUTES);
              server.awaitTermination(1L, TimeUnit.MINUTES);
          } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
              throw new RuntimeException(e);
          } finally {
              channel.shutdownNow();
              channel = null;
              server.shutdownNow();
              server = null;
          }
      }
  
      @Test
      public void export() {
          ExportEvent event = new ExportEvent(new MockExporterMetrics(), ExportEvent.EventType.TOTAL);
          exporter.export(event);
      }
  
      public static class MockExporterMetrics extends MockMetrics implements WithMetadata {
          @Override
          public MetricsMetaInfo getMeta() {
              return new MetricsMetaInfo("mock-metrics", DefaultScopeDefine.SERVICE);
          }
      }
  
      @Test
      public void initSubscriptionList() {
          exporter.fetchSubscriptionList();
      }
  
      @Test
      public void init() {
          exporter.init(null);
      }
  
      @Test
      public void consume() {
  
          exporter.consume(dataList());
          exporter.consume(Collections.emptyList());
      }
  
      @Test
      public void onError() {
          Exception e = new IllegalArgumentException("something wrong");
          exporter.onError(Collections.emptyList(), e);
          exporter.onError(dataList(), e);
      }
  
      @Test
      public void onExit() {
          exporter.onExit();
      }
  
      private List<ExportData> dataList() {
          List<ExportData> dataList = new LinkedList<>();
          dataList.add(new ExportData(metaInfo, new MockMetrics(), INCREMENT));
          dataList.add(new ExportData(metaInfo, new MockIntValueMetrics(), INCREMENT));
          dataList.add(new ExportData(metaInfo, new MockLongValueMetrics(), INCREMENT));
          dataList.add(new ExportData(metaInfo, new MockDoubleValueMetrics(), INCREMENT));
          return dataList;
      }
  }
  