content: /*
   * 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.ArrayList;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import io.grpc.ManagedChannel;
  import io.grpc.ManagedChannelBuilder;
  import io.grpc.Server;
  import io.grpc.ServerBuilder;
  import io.grpc.stub.StreamObserver;
  import org.apache.camel.RoutesBuilder;
  import org.apache.camel.builder.RouteBuilder;
  import org.apache.camel.test.AvailablePortFinder;
  import org.apache.camel.test.junit5.CamelTestSupport;
  import org.junit.jupiter.api.*;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  public class GrpcProxyAsyncAsyncTest extends CamelTestSupport {
  
      private static final Logger LOG = LoggerFactory.getLogger(GrpcProxyAsyncAsyncTest.class);
  
      private static final int GRPC_STUB_PORT = AvailablePortFinder.getNextAvailable();
      private static final int GRPC_ROUTE_PORT = AvailablePortFinder.getNextAvailable();
  
      private static Server grpcServer;
      private ManagedChannel channel;
      private PingPongGrpc.PingPongStub stub;
      private final AtomicBoolean routeHasException = new AtomicBoolean(false);
  
      @BeforeAll
      public static void beforeAll() throws Exception {
          grpcServer = ServerBuilder.forPort(GRPC_STUB_PORT).addService(new PingPongImpl()).build().start();
          LOG.info("gRPC server started on port {}", GRPC_STUB_PORT);
      }
  
      @AfterAll
      public static void afterAll() {
          if (grpcServer != null) {
              grpcServer.shutdown();
              LOG.info("gRPC server stopped");
          }
      }
  
      @BeforeEach
      public void beforeEach() {
          channel = ManagedChannelBuilder.forAddress("localhost", GRPC_ROUTE_PORT).usePlaintext().build();
          stub = PingPongGrpc.newStub(channel);
      }
  
      @AfterEach
      public void afterEach() throws Exception {
          channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
      }
  
      @Test
      public void asyncAsyncTest() throws Exception {
          PingRequest rq1 = PingRequest.newBuilder().setPingName("rq1").setPingId(100).build();
          PingRequest rq2 = PingRequest.newBuilder().setPingName("rq2").setPingId(200).build();
          List<PongResponse> responses = new ArrayList<>();
          AtomicBoolean onCompleted = new AtomicBoolean(false);
          AtomicBoolean onError = new AtomicBoolean(false);
          CountDownLatch latch = new CountDownLatch(1);
          var requests = stub.pingAsyncAsync(new StreamObserver<PongResponse>() {
              @Override
              public void onNext(PongResponse pongResponse) {
                  responses.add(pongResponse);
              }
  
              @Override
              public void onError(Throwable throwable) {
                  onError.set(true);
                  latch.countDown();
              }
  
              @Override
              public void onCompleted() {
                  onCompleted.set(true);
                  latch.countDown();
              }
          });
          requests.onNext(rq1);
          requests.onNext(rq2);
          requests.onNext(rq2);
          requests.onCompleted();
          assertTrue(latch.await(5, TimeUnit.SECONDS));
          assertFalse(routeHasException.get());
          assertEquals(6, responses.size());
          assertTrue(onCompleted.get());
          assertFalse(onError.get());
      }
  
      @Override
      protected RoutesBuilder createRouteBuilder() throws Exception {
          return new RouteBuilder() {
              @Override
              public void configure() throws Exception {
                  onException(Exception.class).process(e -> routeHasException.set(true));
                  from("grpc://localhost:" + GRPC_ROUTE_PORT +
                       "/org.apache.camel.component.grpc.PingPong" +
                       "?routeControlledStreamObserver=true" +
                       "&consumerStrategy=DELEGATION" +
                       "&forwardOnError=true" +
                       "&forwardOnCompleted=true")
                          .toD("grpc://localhost:" + GRPC_STUB_PORT +
                               "/org.apache.camel.component.grpc.PingPong" +
                               "?method=${header.CamelGrpcMethodName}" +
                               "&producerStrategy=STREAMING" +
                               "&streamRepliesTo=direct:next" +
                               "&forwardOnError=true" +
                               "&forwardOnCompleted=true" +
                               "&inheritExchangePropertiesForReplies=true");
                  from("direct:next")
                          .to("grpc://dummy:80/?toRouteControlledStreamObserver=true");
              }
          };
      }
  
      static class PingPongImpl extends PingPongGrpc.PingPongImplBase {
  
          @Override
          public StreamObserver<PingRequest> pingAsyncAsync(StreamObserver<PongResponse> responseObserver) {
              return new StreamObserver<PingRequest>() {
                  @Override
                  public void onNext(PingRequest pingRequest) {
                      var rs = PongResponse.newBuilder()
                              .setPongId(pingRequest.getPingId())
                              .setPongName(pingRequest.getPingName() + "-rs")
                              .build();
                      responseObserver.onNext(rs);
                      responseObserver.onNext(rs);
                  }
  
                  @Override
                  public void onError(Throwable throwable) {
                      responseObserver.onError(throwable);
                  }
  
                  @Override
                  public void onCompleted() {
                      responseObserver.onCompleted();
                  }
              };
          }
      }
  }
  