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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;
  
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.TimeUnit;
  import java.util.function.Consumer;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.Elements;
  import org.apache.beam.model.fnexecution.v1.BeamFnDataGrpc;
  import org.apache.beam.model.pipeline.v1.Endpoints.ApiServiceDescriptor;
  import org.apache.beam.sdk.fn.server.GrpcContextHeaderAccessorProvider;
  import org.apache.beam.sdk.fn.server.InProcessServerFactory;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.CallOptions;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.Channel;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ClientCall;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ClientInterceptor;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ForwardingClientCall.SimpleForwardingClientCall;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.Metadata;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.MethodDescriptor;
  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.ImmutableList;
  import org.junit.Assert;
  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.Mockito;
  
  /** Tests for {@link GrpcContextHeaderAccessorProvider}. */
  @RunWith(JUnit4.class)
  public class GrpcContextHeaderAccessorProviderTest {
    @Rule public GrpcCleanupRule cleanupRule = new GrpcCleanupRule().setTimeout(10, TimeUnit.SECONDS);
    @Rule public transient Timeout globalTimeout = Timeout.seconds(600);
  
    @SuppressWarnings("unchecked")
    @Test
    public void testWorkerIdOnConnect() throws Exception {
      final String worker1 = "worker1";
      CompletableFuture<String> workerId = new CompletableFuture<>();
      Consumer<StreamObserver<Elements>> consumer =
          elementsStreamObserver -> {
            workerId.complete(GrpcContextHeaderAccessorProvider.getHeaderAccessor().getSdkWorkerId());
            elementsStreamObserver.onCompleted();
          };
      TestDataService testService = new TestDataService(Mockito.mock(StreamObserver.class), consumer);
      ApiServiceDescriptor serviceDescriptor =
          ApiServiceDescriptor.newBuilder().setUrl("testServer").build();
      cleanupRule.register(
          InProcessServerFactory.create().create(ImmutableList.of(testService), serviceDescriptor));
      final Metadata.Key<String> workerIdKey =
          Metadata.Key.of("worker_id", Metadata.ASCII_STRING_MARSHALLER);
      Channel channel =
          cleanupRule.register(
              InProcessChannelBuilder.forName(serviceDescriptor.getUrl())
                  .intercept(
                      new ClientInterceptor() {
                        @Override
                        public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(
                            MethodDescriptor<ReqT, RespT> method,
                            CallOptions callOptions,
                            Channel next) {
                          ClientCall<ReqT, RespT> call = next.newCall(method, callOptions);
                          return new SimpleForwardingClientCall<ReqT, RespT>(call) {
                            @Override
                            public void start(
                                ClientCall.Listener<RespT> responseListener, Metadata headers) {
                              headers.put(workerIdKey, worker1);
                              super.start(responseListener, headers);
                            }
                          };
                        }
                      })
                  .build());
      BeamFnDataGrpc.BeamFnDataStub stub = BeamFnDataGrpc.newStub(channel);
      stub.data(Mockito.mock(StreamObserver.class)).onCompleted();
  
      Assert.assertEquals(worker1, workerId.get());
    }
  
    /** A test gRPC service that uses the provided inbound observer for all clients. */
    private static class TestDataService extends BeamFnDataGrpc.BeamFnDataImplBase {
      private final StreamObserver<BeamFnApi.Elements> inboundObserver;
      private final Consumer<StreamObserver<Elements>> consumer;
  
      private TestDataService(
          StreamObserver<BeamFnApi.Elements> inboundObserver,
          Consumer<StreamObserver<BeamFnApi.Elements>> consumer) {
        this.inboundObserver = inboundObserver;
        this.consumer = consumer;
      }
  
      @Override
      public StreamObserver<BeamFnApi.Elements> data(
          StreamObserver<BeamFnApi.Elements> outboundObserver) {
        consumer.accept(outboundObserver);
        return inboundObserver;
      }
    }
  }
  