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WebSocketTestStream.cs
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WebSocketTestStream.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace System.Net.WebSockets.Tests
{
/// <summary>
/// A helper stream class that can be used simulate sending / receiving (duplex) data in a websocket.
/// </summary>
public class WebSocketTestStream : Stream
{
private readonly SemaphoreSlim _inputLock = new(initialCount: 0);
private readonly Queue<Block> _inputQueue = new();
private readonly CancellationTokenSource _disposed = new();
public WebSocketTestStream()
{
GC.SuppressFinalize(this);
Remote = new WebSocketTestStream(this);
}
private WebSocketTestStream(WebSocketTestStream remote)
{
GC.SuppressFinalize(this);
Remote = remote;
}
public WebSocketTestStream Remote { get; }
/// <summary>
/// Returns the number of unread bytes.
/// </summary>
public int Available
{
get
{
int available = 0;
lock (_inputQueue)
{
foreach (Block x in _inputQueue)
{
available += x.AvailableLength;
}
}
return available;
}
}
public Span<byte> NextAvailableBytes
{
get
{
lock (_inputQueue)
{
if (_inputQueue.TryPeek(out Block block))
{
return block.Available;
}
return default;
}
}
}
/// <summary>
/// If set, would cause the next send operation to be delayed
/// and complete asynchronously. Can be used to test cancellation tokens
/// and async code branches.
/// </summary>
public TimeSpan DelayForNextSend { get; set; }
/// <summary>
/// If set, would cause the next read operation to be delayed
/// and complete asynchronously. Can be used to test cancellation tokens
/// and async code branches.
/// </summary>
public TimeSpan DelayForNextRead { get; set; }
/// <summary>
/// When set, ignores the cancellation token passed to ReadAsync and WriteAsync.
/// </summary>
public bool IgnoreCancellationToken { get; set; }
public override bool CanRead => true;
public override bool CanSeek => false;
public override bool CanWrite => true;
public override long Length => -1;
public override long Position { get => -1; set => throw new NotSupportedException(); }
protected override void Dispose(bool disposing)
{
if (!_disposed.IsCancellationRequested)
{
_disposed.Cancel();
lock (Remote._inputQueue)
{
Remote._inputLock.Release();
Remote._inputQueue.Enqueue(Block.ConnectionClosed);
}
}
}
public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken)
{
if (DelayForNextRead > TimeSpan.Zero)
{
await Task.Delay(DelayForNextRead);
DelayForNextRead = TimeSpan.Zero;
}
using CancellationTokenSource cancellation = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, _disposed.Token);
try
{
await _inputLock.WaitAsync(IgnoreCancellationToken ? default : cancellation.Token).ConfigureAwait(false);
}
catch (TaskCanceledException) when (cancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException(cancellationToken);
}
catch (OperationCanceledException) when (_disposed.IsCancellationRequested)
{
return 0;
}
lock (_inputQueue)
{
Block block = _inputQueue.Peek();
if (block == Block.ConnectionClosed)
{
return 0;
}
int count = Math.Min(block.AvailableLength, buffer.Length);
block.Available.Slice(0, count).CopyTo(buffer.Span);
block.Advance(count);
if (block.AvailableLength == 0)
{
_inputQueue.Dequeue();
}
else
{
// Because we haven't fully consumed the buffer
// we should release once the input lock so we can acquire
// it again on consequent receive.
_inputLock.Release();
}
return count;
}
}
/// <summary>
/// Enqueues the provided data for receive by the WebSocket.
/// </summary>
public void Enqueue(params byte[] data)
{
lock (_inputQueue)
{
_inputLock.Release();
_inputQueue.Enqueue(new Block(data));
}
}
/// <summary>
/// Enqueues the provided data for receive by the WebSocket.
/// </summary>
public void Enqueue(ReadOnlySpan<byte> data)
{
lock (_inputQueue)
{
_inputLock.Release();
_inputQueue.Enqueue(new Block(data.ToArray()));
}
}
public void Clear()
{
lock (_inputQueue)
{
while (_inputQueue.Count > 0)
{
if (_inputQueue.Peek() == Block.ConnectionClosed)
{
break;
}
_inputQueue.Dequeue();
}
while (_inputLock.CurrentCount > _inputQueue.Count)
{
_inputLock.Wait(0);
}
}
}
public override void Write(ReadOnlySpan<byte> buffer)
{
lock (Remote._inputQueue)
{
Remote._inputLock.Release();
Remote._inputQueue.Enqueue(new Block(buffer.ToArray()));
}
}
public override async ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken)
{
if (DelayForNextSend > TimeSpan.Zero)
{
await Task.Delay(DelayForNextSend, IgnoreCancellationToken ? default : cancellationToken);
DelayForNextSend = TimeSpan.Zero;
}
Write(buffer.Span);
}
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) => throw new NotSupportedException();
private sealed class Block
{
public static readonly Block ConnectionClosed = new(Array.Empty<byte>());
private readonly byte[] _data;
private int _position;
public Block(byte[] data)
{
_data = data;
}
public Span<byte> Available => _data.AsSpan(_position);
public int AvailableLength => _data.Length - _position;
public void Advance(int count) => _position += count;
}
}
}