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AsyncEnumerableSpec.cs
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AsyncEnumerableSpec.cs
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//-----------------------------------------------------------------------
// <copyright file="AsyncEnumerableSpec.cs" company="Akka.NET Project">
// Copyright (C) 2009-2022 Lightbend Inc. <http://www.lightbend.com>
// Copyright (C) 2013-2022 .NET Foundation <https://github.com/akkadotnet/akka.net>
// </copyright>
//-----------------------------------------------------------------------
using System;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Akka.Pattern;
using Akka.Streams.Dsl;
using Akka.Streams.TestKit;
using Akka.TestKit;
using FluentAssertions;
using Xunit;
using Xunit.Abstractions;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using Akka.TestKit.Extensions;
using Akka.Util;
using FluentAssertions.Extensions;
using static FluentAssertions.FluentActions;
namespace Akka.Streams.Tests.Dsl
{
#if NETCOREAPP
public class AsyncEnumerableSpec : AkkaSpec
{
private ActorMaterializer Materializer { get; }
private ITestOutputHelper _helper;
public AsyncEnumerableSpec(ITestOutputHelper helper) : base(
AkkaSpecConfig.WithFallback(StreamTestDefaultMailbox.DefaultConfig),
helper)
{
_helper = helper;
var settings = ActorMaterializerSettings.Create(Sys).WithInputBuffer(2, 16);
Materializer = ActorMaterializer.Create(Sys, settings);
}
[Fact]
public async Task RunAsAsyncEnumerable_Uses_CancellationToken()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
var input = Enumerable.Range(1, 6).ToList();
var cts = new CancellationTokenSource();
var token = cts.Token;
var asyncEnumerable = Source.From(input).RunAsAsyncEnumerable(Materializer);
await Awaiting(async () =>
{
await foreach (var a in asyncEnumerable.WithCancellation(token))
{
cts.Cancel();
}
}).Should().ThrowAsync<OperationCanceledException>().ShouldCompleteWithin(3.Seconds());
}, Materializer);
}
[Fact]
public async Task RunAsAsyncEnumerable_must_return_an_IAsyncEnumerableT_from_a_Source()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
var input = Enumerable.Range(1, 6).ToList();
var asyncEnumerable = Source.From(input).RunAsAsyncEnumerable(Materializer);
var output = await asyncEnumerable.ToListAsync().AsTask().ShouldCompleteWithin(3.Seconds());
output.Should().BeEquivalentTo(input, options => options.WithStrictOrdering());
}, Materializer);
}
[Fact]
public async Task RunAsAsyncEnumerable_must_allow_multiple_enumerations()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
var input = Enumerable.Range(1, 6).ToList();
var asyncEnumerable = Source.From(input).RunAsAsyncEnumerable(Materializer);
var output = await asyncEnumerable.ToListAsync().AsTask().ShouldCompleteWithin(3.Seconds());
output.Should().BeEquivalentTo(input, options => options.WithStrictOrdering());
output = await asyncEnumerable.ToListAsync().AsTask().ShouldCompleteWithin(3.Seconds());
output.Should().BeEquivalentTo(input, options => options.WithStrictOrdering());
}, Materializer);
}
[Fact]
public async Task RunAsAsyncEnumerable_Throws_on_Abrupt_Stream_termination()
{
var materializer = ActorMaterializer.Create(Sys);
var probe = this.CreatePublisherProbe<int>();
var task = Source.FromPublisher(probe).RunAsAsyncEnumerable(materializer);
var a = Task.Run(async () =>
{
await foreach (var _ in task)
{
if(!materializer.IsShutdown)
materializer.Shutdown();
}
});
//since we are collapsing the stream inside the read
//we want to send messages so we aren't just waiting forever.
await probe.SendNextAsync(1);
await probe.SendNextAsync(2);
var thrown = false;
try
{
await a.ShouldCompleteWithin(3.Seconds());
}
catch (StreamDetachedException)
{
thrown = true;
}
catch (AbruptTerminationException)
{
thrown = true;
}
thrown.Should().BeTrue();
}
[Fact]
public async Task RunAsAsyncEnumerable_Throws_if_materializer_gone_before_Enumeration()
{
var materializer = ActorMaterializer.Create(Sys);
var probe = this.CreatePublisherProbe<int>();
var task = Source.FromPublisher(probe).RunAsAsyncEnumerable(materializer);
materializer.Shutdown();
await Awaiting(async () =>
{
await foreach (var a in task)
{
}
}).Should().ThrowAsync<IllegalStateException>().ShouldCompleteWithin(3.Seconds());
}
[Fact]
public async Task
AsyncEnumerableSource_Must_Complete_Immediately_With_No_elements_When_An_Empty_IAsyncEnumerable_Is_Passed_In()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
IAsyncEnumerable<int> Range() => RangeAsync(0, 0);
var subscriber = this.CreateManualSubscriberProbe<int>();
Source.From(Range)
.RunWith(Sink.FromSubscriber(subscriber), Materializer);
var subscription = await subscriber.ExpectSubscriptionAsync();
subscription.Request(100);
await subscriber.ExpectCompleteAsync();
}, Materializer);
}
[Fact]
public async Task AsyncEnumerableSource_Must_Process_All_Elements()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
IAsyncEnumerable<int> Range() => RangeAsync(0, 100);
var subscriber = this.CreateManualSubscriberProbe<int>();
Source.From(Range)
.RunWith(Sink.FromSubscriber(subscriber), Materializer);
var subscription = await subscriber.ExpectSubscriptionAsync();
subscription.Request(101);
await subscriber.ExpectNextNAsync(Enumerable.Range(0, 100));
await subscriber.ExpectCompleteAsync();
}, Materializer);
}
[Fact]
public async Task AsyncEnumerableSource_Must_Process_Source_That_Immediately_Throws()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
IAsyncEnumerable<int> Range() => ThrowingRangeAsync(0, 100, 50);
var subscriber = this.CreateManualSubscriberProbe<int>();
Source.From(Range)
.RunWith(Sink.FromSubscriber(subscriber), Materializer);
var subscription = await subscriber.ExpectSubscriptionAsync();
subscription.Request(101);
await subscriber.ExpectNextNAsync(Enumerable.Range(0, 50));
var exception = await subscriber.ExpectErrorAsync();
// Exception should be automatically unrolled, this SHOULD NOT be AggregateException
exception.Should().BeOfType<TestException>();
exception.Message.Should().Be("BOOM!");
}, Materializer);
}
[Fact]
public async Task AsyncEnumerableSource_Must_Cancel_Running_Source_If_Downstream_Completes()
{
await this.AssertAllStagesStoppedAsync(async () =>
{
var latch = new AtomicBoolean();
IAsyncEnumerable<int> Range() => ProbeableRangeAsync(0, 100, latch);
var subscriber = this.CreateManualSubscriberProbe<int>();
Source.From(Range)
.RunWith(Sink.FromSubscriber(subscriber), Materializer);
var subscription = await subscriber.ExpectSubscriptionAsync();
subscription.Request(50);
await subscriber.ExpectNextNAsync(Enumerable.Range(0, 50));
subscription.Cancel();
// The cancellation token inside the IAsyncEnumerable should be cancelled
await WithinAsync(3.Seconds(), async () => latch.Value);
}, Materializer);
}
private static async IAsyncEnumerable<int> RangeAsync(int start, int count,
[EnumeratorCancellation] CancellationToken token = default)
{
foreach (var i in Enumerable.Range(start, count))
{
await Task.Delay(10, token);
if(token.IsCancellationRequested)
yield break;
yield return i;
}
}
private static async IAsyncEnumerable<int> ThrowingRangeAsync(int start, int count, int throwAt,
[EnumeratorCancellation] CancellationToken token = default)
{
foreach (var i in Enumerable.Range(start, count))
{
if(token.IsCancellationRequested)
yield break;
if (i == throwAt)
throw new TestException("BOOM!");
yield return i;
}
}
private static async IAsyncEnumerable<int> ProbeableRangeAsync(int start, int count, AtomicBoolean latch,
[EnumeratorCancellation] CancellationToken token = default)
{
token.Register(() =>
{
latch.GetAndSet(true);
});
foreach (var i in Enumerable.Range(start, count))
{
if(token.IsCancellationRequested)
yield break;
yield return i;
}
}
}
#else
#endif
}