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.Iterator;
  import java.util.List;
  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.CamelContext;
  import org.apache.camel.Exchange;
  import org.apache.camel.Message;
  import org.apache.camel.builder.RouteBuilder;
  import org.apache.camel.impl.DefaultCamelContext;
  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.*;
  
  public class RouteControlledStreamObserverTest extends CamelTestSupport {
  
      private static final Logger LOG = LoggerFactory.getLogger(GrpcConsumerAggregationTest.class);
  
      private static final int GRPC_SYNC_REQUEST_TEST_PORT = AvailablePortFinder.getNextAvailable();
      private static final int GRPC_ASYNC_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 syncRequestChannel;
      private ManagedChannel asyncRequestChannel;
      private PingPongGrpc.PingPongBlockingStub blockingStub;
      private PingPongGrpc.PingPongStub nonBlockingStub;
      private PingPongGrpc.PingPongStub asyncNonBlockingStub;
  
      @BeforeEach
      public void startGrpcChannels() {
          syncRequestChannel = ManagedChannelBuilder.forAddress("localhost", GRPC_SYNC_REQUEST_TEST_PORT).usePlaintext().build();
          asyncRequestChannel
                  = ManagedChannelBuilder.forAddress("localhost", GRPC_ASYNC_REQUEST_TEST_PORT).usePlaintext().build();
          blockingStub = PingPongGrpc.newBlockingStub(syncRequestChannel);
          nonBlockingStub = PingPongGrpc.newStub(syncRequestChannel);
          asyncNonBlockingStub = PingPongGrpc.newStub(asyncRequestChannel);
      }
  
      @AfterEach
      public void stopGrpcChannels() {
          if (syncRequestChannel != null) {
              syncRequestChannel.shutdown().shutdownNow();
          }
          if (asyncRequestChannel != null) {
              asyncRequestChannel.shutdown().shutdownNow();
          }
      }
  
      @Test
      public void testSyncSyncMethodInSync() {
          LOG.info("gRPC pingSyncSync method blocking test start");
          PingRequest pingRequest
                  = PingRequest.newBuilder().setPingName(GRPC_TEST_PING_VALUE).setPingId(GRPC_TEST_PING_ID).build();
          PongResponse pongResponse = blockingStub.pingSyncSync(pingRequest);
  
          assertNotNull(pongResponse);
          assertEquals(GRPC_TEST_PING_ID, pongResponse.getPongId());
          assertEquals(GRPC_TEST_PING_VALUE + GRPC_TEST_PONG_VALUE, pongResponse.getPongName());
      }
  
      @Test
      public void testSyncAsyncMethodInSync() {
          LOG.info("gRPC pingSyncAsync method blocking test start");
          PingRequest pingRequest
                  = PingRequest.newBuilder().setPingName(GRPC_TEST_PING_VALUE).setPingId(GRPC_TEST_PING_ID).build();
          Iterator<PongResponse> pongResponseIter = blockingStub.pingSyncAsync(pingRequest);
          while (pongResponseIter.hasNext()) {
              PongResponse pongResponse = pongResponseIter.next();
              assertNotNull(pongResponse);
              assertEquals(GRPC_TEST_PING_ID, pongResponse.getPongId());
              assertEquals(GRPC_TEST_PING_VALUE + GRPC_TEST_PONG_VALUE, pongResponse.getPongName());
          }
      }
  
      @Test
      public void testSyncSyncMethodInAsync() throws Exception {
          LOG.info("gRPC pingSyncSync 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);
  
          nonBlockingStub.pingSyncSync(pingRequest, responseObserver);
          assertTrue(latch.await(5, TimeUnit.SECONDS));
  
          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 testSyncAsyncMethodInAsync() throws Exception {
          LOG.info("gRPC pingSyncAsync 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);
  
          nonBlockingStub.pingSyncAsync(pingRequest, responseObserver);
          assertTrue(latch.await(5, TimeUnit.SECONDS));
  
          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 testAsyncSyncMethodInAsync() 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 = asyncNonBlockingStub.pingAsyncSync(responseObserver);
          requestObserver.onNext(pingRequest);
          requestObserver.onNext(pingRequest);
          requestObserver.onCompleted();
          assertTrue(latch.await(5, TimeUnit.SECONDS));
  
          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 testAsyncAsyncMethodInAsync() throws Exception {
          LOG.info("gRPC pingAsyncAsync 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 = asyncNonBlockingStub.pingAsyncAsync(responseObserver);
          requestObserver.onNext(pingRequest);
          requestObserver.onNext(pingRequest);
          requestObserver.onCompleted();
          assertTrue(latch.await(5, TimeUnit.SECONDS));
  
          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 unsupportedEndpointConfigurationFailureTest() throws Exception {
          CamelContext camelContext = new DefaultCamelContext();
          camelContext.addRoutes(new RouteBuilder() {
              @Override
              public void configure() {
                  from("grpc://localhost:" + GRPC_SYNC_REQUEST_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?synchronous=true&consumerStrategy=AGGREGATION" +
                       "&routeControlledStreamObserver=true").to("log:foo");
              }
          });
          assertThrows(IllegalArgumentException.class, camelContext::start);
      }
  
      @Override
      protected RouteBuilder createRouteBuilder() {
          return new RouteBuilder() {
              private void process(Exchange exchange) {
                  Message message = exchange.getIn();
                  PingRequest pingRequest = message.getBody(PingRequest.class);
                  StreamObserver<Object> responseObserver
                          = (StreamObserver<Object>) exchange.getProperty(GrpcConstants.GRPC_RESPONSE_OBSERVER);
                  PongResponse pongResponse
                          = PongResponse.newBuilder().setPongName(pingRequest.getPingName() + GRPC_TEST_PONG_VALUE)
                                  .setPongId(pingRequest.getPingId()).build();
                  message.setBody(pongResponse, PongResponse.class);
                  exchange.setMessage(message);
                  responseObserver.onNext(pongResponse);
                  responseObserver.onCompleted();
              }
  
              @Override
              public void configure() {
                  from("grpc://localhost:" + GRPC_SYNC_REQUEST_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?synchronous=true&consumerStrategy=PROPAGATION&routeControlledStreamObserver=true")
                          .process(this::process);
  
                  from("grpc://localhost:" + GRPC_ASYNC_REQUEST_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?synchronous=true&consumerStrategy=AGGREGATION")
                          .bean(new GrpcMessageBuilder(), "buildAsyncPongResponse");
              }
          };
      }
  
      public static class PongResponseStreamObserver implements StreamObserver<PongResponse> {
          private final CountDownLatch latch;
          private PongResponse pongResponse;
  
          public PongResponseStreamObserver(CountDownLatch latch) {
              this.latch = latch;
          }
  
          public PongResponse getPongResponse() {
              return pongResponse;
          }
  
          @Override
          public void onNext(PongResponse value) {
              pongResponse = value;
          }
  
          @Override
          public void onError(Throwable t) {
              LOG.info("Exception", t);
              latch.countDown();
          }
  
          @Override
          public void onCompleted() {
              latch.countDown();
          }
      }
  
      public static class GrpcMessageBuilder {
          @SuppressWarnings("unused")
          public PongResponse buildAsyncPongResponse(List<PingRequest> pingRequests) {
              return PongResponse.newBuilder().setPongName(pingRequests.get(0).getPingName() + GRPC_TEST_PONG_VALUE)
                      .setPongId(pingRequests.get(0).getPingId()).build();
          }
      }
  }
  