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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.beam.runners.fnexecution.status;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.doAnswer;
  import static org.mockito.Mockito.mock;
  
  import java.util.Map;
  import java.util.Set;
  import java.util.UUID;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.WorkerStatusRequest;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.WorkerStatusResponse;
  import org.apache.beam.model.fnexecution.v1.BeamFnWorkerStatusGrpc;
  import org.apache.beam.model.fnexecution.v1.BeamFnWorkerStatusGrpc.BeamFnWorkerStatusStub;
  import org.apache.beam.model.pipeline.v1.Endpoints.ApiServiceDescriptor;
  import org.apache.beam.sdk.fn.channel.AddHarnessIdInterceptor;
  import org.apache.beam.sdk.fn.server.GrpcContextHeaderAccessorProvider;
  import org.apache.beam.sdk.fn.server.GrpcFnServer;
  import org.apache.beam.sdk.fn.server.InProcessServerFactory;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ManagedChannel;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.inprocess.InProcessChannelBuilder;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.stub.StreamObserver;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.testing.GrpcCleanupRule;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Sets;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.Timeout;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mock;
  import org.mockito.MockitoAnnotations;
  
  @RunWith(JUnit4.class)
  public class BeamWorkerStatusGrpcServiceTest {
    @Rule public transient Timeout globalTimeout = Timeout.seconds(600);
  
    @Rule public final GrpcCleanupRule grpcCleanup = new GrpcCleanupRule();
    private static final String ID = "id";
    private BeamWorkerStatusGrpcService service;
    private GrpcFnServer<BeamWorkerStatusGrpcService> server;
    private ManagedChannel channel;
    private BeamFnWorkerStatusStub stub;
    @Mock private StreamObserver<WorkerStatusRequest> mockObserver;
  
    @Before
    public void setUp() throws Exception {
      MockitoAnnotations.initMocks(this);
      service =
          BeamWorkerStatusGrpcService.create(
              ApiServiceDescriptor.newBuilder().setUrl(UUID.randomUUID().toString()).build(),
              GrpcContextHeaderAccessorProvider.getHeaderAccessor());
      server = GrpcFnServer.allocatePortAndCreateFor(service, InProcessServerFactory.create());
      channel = InProcessChannelBuilder.forName(server.getApiServiceDescriptor().getUrl()).build();
      stub =
          BeamFnWorkerStatusGrpc.newStub(channel)
              .withInterceptors(AddHarnessIdInterceptor.create(ID));
      grpcCleanup.register(server.getServer());
      grpcCleanup.register(channel);
    }
  
    @After
    public void tearDown() throws Exception {
      if (service != null) {
        service.close();
      }
    }
  
    @Test
    public void testClientConnected() throws Exception {
      stub.workerStatus(mockObserver);
      WorkerStatusClient client = waitAndGetStatusClient(ID);
      assertNotNull(client);
    }
  
    @Test
    public void testGetWorkerStatusNoResponse() throws Exception {
      StreamObserver<WorkerStatusResponse> unused = stub.workerStatus(mockObserver);
      waitAndGetStatusClient(ID);
      String response = service.getSingleWorkerStatus("id", 1, TimeUnit.MILLISECONDS);
      assertEquals(
          "Error: exception encountered getting status from SDK harness: java.util.concurrent.TimeoutException",
          response);
    }
  
    @Test
    public void testGetWorkerStatusSuccess() throws Exception {
      StreamObserver<WorkerStatusResponse> observer = stub.workerStatus(mockObserver);
      waitAndGetStatusClient(ID);
      doAnswer(
              (invocation) -> {
                WorkerStatusRequest request = (WorkerStatusRequest) invocation.getArguments()[0];
                observer.onNext(
                    WorkerStatusResponse.newBuilder()
                        .setId(request.getId())
                        .setStatusInfo("status")
                        .build());
                return null;
              })
          .when(mockObserver)
          .onNext(any());
  
      CompletableFuture<String> future = service.getWorkerStatus(ID);
      String response = future.get(5, TimeUnit.SECONDS);
      assertEquals("status", response);
    }
  
    @Test
    public void testGetWorkerStatusReturnError() throws Exception {
      StreamObserver<WorkerStatusResponse> observer = stub.workerStatus(mockObserver);
      waitAndGetStatusClient(ID);
      doAnswer(
              (invocation) -> {
                WorkerStatusRequest request = (WorkerStatusRequest) invocation.getArguments()[0];
                observer.onNext(
                    WorkerStatusResponse.newBuilder()
                        .setId(request.getId())
                        .setError("error")
                        .build());
                return null;
              })
          .when(mockObserver)
          .onNext(any());
  
      CompletableFuture<String> future = service.getWorkerStatus(ID);
      String response = future.get(5, TimeUnit.SECONDS);
      assertEquals("error", response);
    }
  
    @Test
    public void testGetAllWorkerStatuses() throws Exception {
      Set<String> ids = Sets.newHashSet("id0", "id3", "id11", "id12", "id21");
      for (String id : ids) {
        StreamObserver<WorkerStatusRequest> requestObserverMock = mock(StreamObserver.class);
        BeamFnWorkerStatusStub workerStatusStub =
            BeamFnWorkerStatusGrpc.newStub(channel)
                .withInterceptors(AddHarnessIdInterceptor.create(id));
        StreamObserver<WorkerStatusResponse> observer =
            workerStatusStub.workerStatus(requestObserverMock);
        // wait for connection before proceeding to avoid race condition.
        waitAndGetStatusClient(id);
        doAnswer(
                (invocation) -> {
                  WorkerStatusRequest request = (WorkerStatusRequest) invocation.getArguments()[0];
                  observer.onNext(
                      WorkerStatusResponse.newBuilder()
                          .setId(request.getId())
                          .setStatusInfo("status")
                          .build());
                  return null;
                })
            .when(requestObserverMock)
            .onNext(any());
      }
      Map<String, String> allWorkerStatuses = service.getAllWorkerStatuses(5, TimeUnit.SECONDS);
  
      assertEquals(ids, allWorkerStatuses.keySet());
  
      for (String id : ids) {
        assertEquals("status", allWorkerStatuses.get(id));
      }
    }
  
    private WorkerStatusClient waitAndGetStatusClient(String id)
        throws InterruptedException, ExecutionException, TimeoutException {
      // wait for status client connection, and get the corresponding client.
      CompletableFuture<WorkerStatusClient> clientFuture = service.getStatusClient(id);
      return clientFuture.get(1, TimeUnit.SECONDS);
    }
  }
  