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   * 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.camel.component.grpc;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  import io.grpc.ManagedChannel;
  import io.grpc.ManagedChannelBuilder;
  import io.grpc.stub.StreamObserver;
  import org.apache.camel.builder.RouteBuilder;
  import org.apache.camel.component.mock.MockEndpoint;
  import org.apache.camel.test.AvailablePortFinder;
  import org.apache.camel.test.junit5.CamelTestSupport;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class GrpcConsumerPropagationTest extends CamelTestSupport {
  
      private static final Logger LOG = LoggerFactory.getLogger(GrpcConsumerPropagationTest.class);
  
      private static final int GRPC_ASYNC_NEXT_REQUEST_TEST_PORT = AvailablePortFinder.getNextAvailable();
      private static final int GRPC_ASYNC_COMPLETED_REQUEST_TEST_PORT = AvailablePortFinder.getNextAvailable();
      private static final int GRPC_TEST_PING_ID = 1;
      private static final String GRPC_TEST_PING_VALUE = "PING";
      private static final String GRPC_TEST_PONG_VALUE = "PONG";
  
      private ManagedChannel asyncOnNextChannel;
      private ManagedChannel asyncOnCompletedChannel;
      private PingPongGrpc.PingPongStub asyncOnNextStub;
      private PingPongGrpc.PingPongStub asyncOnCompletedStub;
  
      @BeforeEach
      public void startGrpcChannels() {
          asyncOnNextChannel
                  = ManagedChannelBuilder.forAddress("localhost", GRPC_ASYNC_NEXT_REQUEST_TEST_PORT).usePlaintext().build();
          asyncOnCompletedChannel
                  = ManagedChannelBuilder.forAddress("localhost", GRPC_ASYNC_COMPLETED_REQUEST_TEST_PORT).usePlaintext().build();
          asyncOnNextStub = PingPongGrpc.newStub(asyncOnNextChannel);
          asyncOnCompletedStub = PingPongGrpc.newStub(asyncOnCompletedChannel);
      }
  
      @AfterEach
      public void stopGrpcChannels() throws Exception {
          if (asyncOnNextChannel != null) {
              asyncOnNextChannel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
          }
          if (asyncOnCompletedChannel != null) {
              asyncOnCompletedChannel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
          }
      }
  
      @Test
      public void testOnNextPropagation() throws Exception {
          LOG.info("gRPC pingAsyncSync method async test start");
  
          final CountDownLatch latch = new CountDownLatch(1);
          PingRequest pingRequest
                  = PingRequest.newBuilder().setPingName(GRPC_TEST_PING_VALUE).setPingId(GRPC_TEST_PING_ID).build();
          PongResponseStreamObserver responseObserver = new PongResponseStreamObserver(latch);
  
          StreamObserver<PingRequest> requestObserver = asyncOnNextStub.pingAsyncSync(responseObserver);
          requestObserver.onNext(pingRequest);
          requestObserver.onCompleted();
          assertTrue(latch.await(5, TimeUnit.SECONDS));
  
          MockEndpoint mockEndpoint = getMockEndpoint("mock:async-on-next-propagation");
          mockEndpoint.expectedMessageCount(1);
          mockEndpoint.expectedHeaderValuesReceivedInAnyOrder(GrpcConstants.GRPC_EVENT_TYPE_HEADER,
                  GrpcConstants.GRPC_EVENT_TYPE_ON_NEXT);
          mockEndpoint.expectedHeaderValuesReceivedInAnyOrder(GrpcConstants.GRPC_METHOD_NAME_HEADER, "pingAsyncSync");
          mockEndpoint.assertIsSatisfied();
  
          PongResponse pongResponse = responseObserver.getPongResponse();
          assertNotNull(pongResponse);
          assertEquals(GRPC_TEST_PING_ID, pongResponse.getPongId());
          assertEquals(GRPC_TEST_PING_VALUE + GRPC_TEST_PONG_VALUE, pongResponse.getPongName());
      }
  
      @Test
      public void testOnCompletedPropagation() throws Exception {
          LOG.info("gRPC pingAsyncAsync method async test start");
          final CountDownLatch latch = new CountDownLatch(1);
          PongResponseStreamObserver responseObserver = new PongResponseStreamObserver(latch);
  
          StreamObserver<PingRequest> requestObserver = asyncOnCompletedStub.pingAsyncAsync(responseObserver);
          requestObserver.onCompleted();
          assertTrue(latch.await(5, TimeUnit.SECONDS));
  
          MockEndpoint mockEndpoint = getMockEndpoint("mock:async-on-completed-propagation");
          mockEndpoint.expectedMessageCount(1);
          mockEndpoint.expectedHeaderValuesReceivedInAnyOrder(GrpcConstants.GRPC_EVENT_TYPE_HEADER,
                  GrpcConstants.GRPC_EVENT_TYPE_ON_COMPLETED);
          mockEndpoint.expectedHeaderValuesReceivedInAnyOrder(GrpcConstants.GRPC_METHOD_NAME_HEADER, "pingAsyncAsync");
          mockEndpoint.assertIsSatisfied();
      }
  
      @Override
      protected RouteBuilder createRouteBuilder() {
          return new RouteBuilder() {
              @Override
              public void configure() {
  
                  from("grpc://localhost:" + GRPC_ASYNC_NEXT_REQUEST_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?consumerStrategy=PROPAGATION")
                          .to("mock:async-on-next-propagation")
                          .bean(new GrpcMessageBuilder(), "buildAsyncPongResponse");
  
                  from("grpc://localhost:" + GRPC_ASYNC_COMPLETED_REQUEST_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?consumerStrategy=PROPAGATION&forwardOnCompleted=true")
                          .to("mock:async-on-completed-propagation");
              }
          };
      }
  
      public class PongResponseStreamObserver implements StreamObserver<PongResponse> {
          private PongResponse pongResponse;
          private final CountDownLatch latch;
  
          public PongResponseStreamObserver(CountDownLatch latch) {
              this.latch = latch;
          }
  
          public PongResponse getPongResponse() {
              return pongResponse;
          }
  
          @Override
          public void onNext(PongResponse value) {
              pongResponse = value;
              latch.countDown();
          }
  
          @Override
          public void onError(Throwable t) {
              LOG.info("Exception", t);
              latch.countDown();
          }
  
          @Override
          public void onCompleted() {
              latch.countDown();
          }
      }
  
      public class GrpcMessageBuilder {
  
          public PongResponse buildAsyncPongResponse(PingRequest pingRequests) {
              return PongResponse.newBuilder().setPongName(pingRequests.getPingName() + GRPC_TEST_PONG_VALUE)
                      .setPongId(pingRequests.getPingId()).build();
          }
      }
  
  }
  