grpc/src/csharp/Grpc.Core.Tests/HalfcloseTest.cs

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#endregion

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

using Grpc.Core;
using Grpc.Core.Internal;
using Grpc.Core.Utils;

using NUnit.Framework;

namespace Grpc.Core.Tests
{
    public class HalfcloseTest
    {
        MockServiceHelper helper;
        Server server;
        Channel channel;

        [SetUp]
        public void Init()
        {
            helper = new MockServiceHelper();

            server = helper.GetServer();
            server.Start();
            channel = helper.GetChannel();
        }

        [TearDown]
        public void Cleanup()
        {
            channel.ShutdownAsync().Wait();
            server.ShutdownAsync().Wait();
        }

        /// <summary>
        /// For client streaming and duplex streaming calls, if server does a full close
        /// before we halfclose the request stream, an attempt to halfclose
        /// (complete the request stream) shouldn't be treated as an error.
        /// </summary>
        [Test]
        public async Task HalfcloseAfterFullclose_ClientStreamingCall()
        {
            helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
            {
                return "PASS";
            });

            var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall());
            // make sure server has fullclosed on us
            Assert.AreEqual("PASS", await call.ResponseAsync);

            // sending close from client should be still fine because server can finish
            // the call anytime and we cannot do anything about it on the client side.
            await call.RequestStream.CompleteAsync();

            // Second attempt to close from client is not allowed.
            Assert.ThrowsAsync(typeof(InvalidOperationException), async () => await call.RequestStream.CompleteAsync());
        }
    }
}