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Fixes "InvalidOperationException" errors by performing async operatio…
…ns in SemaphoreSlim (#796)
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99 changes: 99 additions & 0 deletions
99
src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNIStreams.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // 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 _writeAsyncSemaphore; | ||
| private readonly ConcurrentQueueSemaphore _readAsyncSemaphore; | ||
|
|
||
| public SNISslStream(Stream innerStream, bool leaveInnerStreamOpen, RemoteCertificateValidationCallback userCertificateValidationCallback) | ||
| : base(innerStream, leaveInnerStreamOpen, userCertificateValidationCallback) | ||
| { | ||
| _writeAsyncSemaphore = new ConcurrentQueueSemaphore(1); | ||
| _readAsyncSemaphore = new ConcurrentQueueSemaphore(1); | ||
| } | ||
|
|
||
| // Prevent ReadAsync collisions by running the task in a Semaphore Slim | ||
| public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| await _readAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| return await base.ReadAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _readAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
|
|
||
| // Prevent the WriteAsync collisions by running the task in a Semaphore Slim | ||
| public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| await _writeAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| await base.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _writeAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This class extends NetworkStream to customize stream behavior for Managed SNI implementation. | ||
| /// </summary> | ||
| internal class SNINetworkStream : NetworkStream | ||
| { | ||
| private readonly ConcurrentQueueSemaphore _writeAsyncSemaphore; | ||
| private readonly ConcurrentQueueSemaphore _readAsyncSemaphore; | ||
|
|
||
| public SNINetworkStream(Socket socket, bool ownsSocket) : base(socket, ownsSocket) | ||
| { | ||
| _writeAsyncSemaphore = new ConcurrentQueueSemaphore(1); | ||
| _readAsyncSemaphore = new ConcurrentQueueSemaphore(1); | ||
| } | ||
|
|
||
| // Prevent ReadAsync collisions by running the task in a Semaphore Slim | ||
| public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| await _readAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| return await base.ReadAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _readAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
|
|
||
| // Prevent the WriteAsync collisions by running the task in a Semaphore Slim | ||
| public override async Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| await _writeAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| await base.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _writeAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
| } | ||
| } |
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