forked from dotnet/SqlClient
/
SNIStreams.cs
97 lines (88 loc) · 3.74 KB
/
SNIStreams.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.
// See the LICENSE file in the project root for more information.
using System.Net.Security;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using System.Net.Sockets;
namespace Microsoft.Data.SqlClient.SNI
{
/// <summary>
/// This class extends SslStream to customize stream behavior for Managed SNI implementation.
/// </summary>
internal class SNISslStream : SslStream
{
private readonly ConcurrentQueueSemaphore _writeAsyncQueueSemaphore;
private readonly ConcurrentQueueSemaphore _readAsyncQueueSemaphore;
public SNISslStream(Stream innerStream, bool leaveInnerStreamOpen, RemoteCertificateValidationCallback userCertificateValidationCallback)
: base(innerStream, leaveInnerStreamOpen, userCertificateValidationCallback)
{
_writeAsyncQueueSemaphore = new ConcurrentQueueSemaphore(1);
_readAsyncQueueSemaphore = new ConcurrentQueueSemaphore(1);
}
// Prevent the ReadAsync's collision by running task in Semaphore Slim
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
try
{
return _readAsyncQueueSemaphore.WaitAsync()
.ContinueWith(_ => base.ReadAsync(buffer, offset, count, cancellationToken).GetAwaiter().GetResult());
}
finally
{
_readAsyncQueueSemaphore.Release();
}
}
// Prevent the WriteAsync's collision by running task in Semaphore Slim
public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
try
{
return _writeAsyncQueueSemaphore.WaitAsync().ContinueWith(_ => base.WriteAsync(buffer, offset, count, cancellationToken));
}
finally
{
_writeAsyncQueueSemaphore.Release();
}
}
}
/// <summary>
/// This class extends NetworkStream to customize stream behavior for Managed SNI implementation.
/// </summary>
internal class SNINetworkStream : NetworkStream
{
private readonly ConcurrentQueueSemaphore _writeAsyncQueueSemaphore;
private readonly ConcurrentQueueSemaphore _readAsyncQueueSemaphore;
public SNINetworkStream(Socket socket, bool ownsSocket) : base(socket, ownsSocket)
{
_writeAsyncQueueSemaphore = new ConcurrentQueueSemaphore(1);
_readAsyncQueueSemaphore = new ConcurrentQueueSemaphore(1);
}
// Prevent the ReadAsync's collision by running task in Semaphore Slim
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
try
{
return _readAsyncQueueSemaphore.WaitAsync()
.ContinueWith(_ => base.ReadAsync(buffer, offset, count, cancellationToken).GetAwaiter().GetResult());
}
finally
{
_readAsyncQueueSemaphore.Release();
}
}
// Prevent the WriteAsync's collision by running task in Semaphore Slim
public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
try
{
return _writeAsyncQueueSemaphore.WaitAsync().ContinueWith(_ => base.WriteAsync(buffer, offset, count, cancellationToken));
}
finally
{
_writeAsyncQueueSemaphore.Release();
}
}
}
}