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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Buffers;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace System.IO.Pipelines
{
// Write only stream implementation for efficiently writing bytes from the request body
internal class PipeWriterStream : Stream
{
private long _length;
private readonly PipeWriter _pipeWriter;
public PipeWriterStream(PipeWriter pipeWriter)
{
_pipeWriter = pipeWriter;
}
public override bool CanRead => false;
public override bool CanSeek => false;
public override bool CanWrite => true;
public override long Length => _length;
public override long Position { get => throw new NotSupportedException(); set => throw new NotSupportedException(); }
public override void Flush()
{
}
public override int Read(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
_pipeWriter.Write(new ReadOnlySpan<byte>(buffer, offset, count));
_length += count;
}
public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
return WriteCoreAsync(buffer.AsMemory(offset, count), cancellationToken).AsTask();
}
#if NETCOREAPP2_1
public override ValueTask WriteAsync(ReadOnlyMemory<byte> source, CancellationToken cancellationToken = default)
{
return WriteCoreAsync(source, cancellationToken);
}
#endif
private ValueTask WriteCoreAsync(ReadOnlyMemory<byte> source, CancellationToken cancellationToken = default)
{
if (cancellationToken.IsCancellationRequested)
{
return new ValueTask(Task.FromCanceled(cancellationToken));
}
_length += source.Length;
var task = _pipeWriter.WriteAsync(source);
if (task.IsCompletedSuccessfully)
{
// Cancellation can be triggered by PipeWriter.CancelPendingFlush
if (task.Result.IsCanceled)
{
throw new OperationCanceledException();
}
}
else if (!task.IsCompletedSuccessfully)
{
return WriteSlowAsync(task);
}
return default;
async ValueTask WriteSlowAsync(ValueTask<FlushResult> flushTask)
{
var flushResult = await flushTask;
// Cancellation can be triggered by PipeWriter.CancelPendingFlush
if (flushResult.IsCanceled)
{
throw new OperationCanceledException();
}
}
}
public void Reset()
{
_length = 0;
}
}
}
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