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

#region Copyright notice and license

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#endregion

using System;
using System.Threading.Tasks;
using Grpc.Core;
using Grpc.Core.Internal;
using Grpc.Core.Utils;
using NUnit.Framework;

namespace Grpc.Core.Tests
{
    public class ChannelTest
    {
        [Test]
        public void Constructor_RejectsInvalidParams()
        {
            Assert.Throws(typeof(ArgumentNullException), () => new Channel(null, ChannelCredentials.Insecure));
        }

        [Test]
        public void Constructor_RejectsDuplicateOptions()
        {
            var options = new ChannelOption[]
            {
                new ChannelOption(ChannelOptions.PrimaryUserAgentString, "ABC"),
                new ChannelOption(ChannelOptions.PrimaryUserAgentString, "XYZ")
            };
            Assert.Throws(typeof(ArgumentException), () => new Channel("127.0.0.1", ChannelCredentials.Insecure, options));
        }

        [Test]
        public void State_IdleAfterCreation()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            Assert.AreEqual(ChannelState.Idle, channel.State);
            channel.ShutdownAsync().Wait();
        }

        [Test]
        public void WaitForStateChangedAsync_InvalidArgument()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            Assert.ThrowsAsync(typeof(ArgumentException), async () => await channel.WaitForStateChangedAsync(ChannelState.Shutdown));
            channel.ShutdownAsync().Wait();
        }

        [Test]
        public void ResolvedTarget()
        {
            var channel = new Channel("127.0.0.1", ChannelCredentials.Insecure);
            Assert.IsTrue(channel.ResolvedTarget.Contains("127.0.0.1"));
            channel.ShutdownAsync().Wait();
        }

        [Test]
        public void Shutdown_AllowedOnlyOnce()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            channel.ShutdownAsync().Wait();
            Assert.ThrowsAsync(typeof(InvalidOperationException), async () => await channel.ShutdownAsync());
        }

        [Test]
        public async Task ShutdownTokenCancelledAfterShutdown()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            Assert.IsFalse(channel.ShutdownToken.IsCancellationRequested);
            var shutdownTask = channel.ShutdownAsync();
            Assert.IsTrue(channel.ShutdownToken.IsCancellationRequested);
            await shutdownTask;
        }

        [Test]
        public async Task StateIsShutdownAfterShutdown()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            await channel.ShutdownAsync();
            Assert.AreEqual(ChannelState.Shutdown, channel.State);
        }

        [Test]
        public async Task ShutdownFinishesWaitForStateChangedAsync()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            var stateChangedTask = channel.WaitForStateChangedAsync(ChannelState.Idle);
            var shutdownTask = channel.ShutdownAsync();
            await stateChangedTask;
            await shutdownTask;
        }

        [Test]
        public async Task OperationsThrowAfterShutdown()
        {
            var channel = new Channel("localhost", ChannelCredentials.Insecure);
            await channel.ShutdownAsync();
            Assert.ThrowsAsync(typeof(ObjectDisposedException), async () => await channel.WaitForStateChangedAsync(ChannelState.Idle));
            Assert.Throws(typeof(ObjectDisposedException), () => { var x = channel.ResolvedTarget; });
            Assert.ThrowsAsync(typeof(TaskCanceledException), async () => await channel.ConnectAsync());
        }
    }
}