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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.
// See the LICENSE file in the project root for more information.
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace System.Net.Test.Common
{
internal class VirtualNetworkStream : Stream
{
private readonly VirtualNetwork _network;
private MemoryStream _readStream;
private readonly bool _isServer;
private object _readStreamLock = new object();
private TaskCompletionSource<object> _flushTcs;
private bool _isFlushed;
public VirtualNetworkStream(VirtualNetwork network, bool isServer)
{
_network = network;
_isServer = isServer;
}
public override bool CanRead
{
get
{
return true;
}
}
public override bool CanSeek
{
get
{
return false;
}
}
public override bool CanWrite
{
get
{
return true;
}
}
public override long Length
{
get
{
throw new NotImplementedException();
}
}
public override long Position
{
get
{
throw new NotImplementedException();
}
set
{
throw new NotImplementedException();
}
}
public override void Flush()
{
_isFlushed = true;
}
public override Task FlushAsync(CancellationToken cancellationToken)
{
if (_flushTcs != null)
{
throw new InvalidOperationException();
}
_flushTcs = new TaskCompletionSource<object>();
return _flushTcs.Task;
}
public bool HasBeenSyncFlushed => _isFlushed;
public void CompleteAsyncFlush()
{
if (_flushTcs == null)
{
throw new InvalidOperationException();
}
_flushTcs.SetResult(null);
_flushTcs = null;
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotImplementedException();
}
public override int Read(byte[] buffer, int offset, int count)
{
lock (_readStreamLock)
{
if (_readStream == null || (_readStream.Position >= _readStream.Length))
{
byte[] innerBuffer;
_network.ReadFrame(_isServer, out innerBuffer);
_readStream = new MemoryStream(innerBuffer);
}
return _readStream.Read(buffer, offset, count);
}
}
public override void Write(byte[] buffer, int offset, int count)
{
byte[] innerBuffer = new byte[count];
Buffer.BlockCopy(buffer, offset, innerBuffer, 0, count);
_network.WriteFrame(_isServer, innerBuffer);
}
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
return cancellationToken.IsCancellationRequested ?
Task.FromCanceled<int>(cancellationToken) :
Task.Run(() => Read(buffer, offset, count));
}
public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
return cancellationToken.IsCancellationRequested ?
Task.FromCanceled<int>(cancellationToken) :
Task.Run(() => Write(buffer, offset, count));
}
}
}
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