public async Task StreamFlushAsyncThrowingDoesReturnMemoryToPool()
{
using (var pool = new DisposeTrackingBufferPool())
{
var stream = new CancelledWritesStream();
var options = new StreamPipeWriterOptions(pool);
PipeWriter writer = PipeWriter.Create(stream, options);
writer.WriteEmpty(10);
Assert.Equal(1, pool.CurrentlyRentedBlocks);
Assert.Equal(0, pool.DisposedBlocks);
ValueTask <FlushResult> task = writer.FlushAsync();
stream.WaitForWriteTask.TrySetResult(null);
stream.WaitForFlushTask.TrySetException(new Exception());
await Assert.ThrowsAsync <Exception>(async() => await task);
Assert.Equal(0, pool.CurrentlyRentedBlocks);
Assert.Equal(1, pool.DisposedBlocks);
writer.Complete();
Assert.Equal(0, pool.CurrentlyRentedBlocks);
Assert.Equal(1, pool.DisposedBlocks);
}
}
public async Task CancelingStreamViaCancellationTokenThrowsOperationCancelledException()
{
var stream = new CancelledWritesStream();
var cts = new CancellationTokenSource();
Task task = PipeReader.CopyToAsync(stream, cts.Token);
// Call write async inline, this will yield when it hits the tcs
Pipe.Writer.WriteEmpty(10);
await Pipe.Writer.FlushAsync();
// Then cancel
cts.Cancel();
// Now resume the write which should result in an exception
stream.WaitForWriteTask.TrySetResult(null);
await Assert.ThrowsAsync <OperationCanceledException>(() => task);
}
public async Task CanCancelFlushAsyncWithCancelPendingFlushStreamWriteAsyncThrows()
{
var stream = new CancelledWritesStream();
stream.WaitForFlushTask.TrySetResult(null);
PipeWriter writer = PipeWriter.Create(stream);
writer.WriteEmpty(10);
ValueTask <FlushResult> task = writer.FlushAsync();
Assert.False(task.IsCompleted);
writer.CancelPendingFlush();
stream.WaitForWriteTask.TrySetResult(null);
FlushResult result = await task;
Assert.True(result.IsCanceled);
writer.Complete();
}
public async Task CanCancelFlushAsyncWithCancellationTokenWhenStreamWriteAsyncThrows()
{
var stream = new CancelledWritesStream();
stream.WaitForFlushTask.TrySetResult(null);
var cts = new CancellationTokenSource();
PipeWriter writer = PipeWriter.Create(stream);
writer.WriteEmpty(10);
ValueTask <FlushResult> task = writer.FlushAsync(cts.Token);
Assert.False(task.IsCompleted);
cts.Cancel();
stream.WaitForWriteTask.TrySetResult(null);
await Assert.ThrowsAsync <OperationCanceledException>(async() => await task);
writer.Complete();
}