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Add ValueTask stream overloads on SNI streams and Waits (dotnet#902)
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60 changes: 60 additions & 0 deletions
60
...osoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/ConcurrentQueueSemaphore.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| // 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; | ||
| using System.Collections.Concurrent; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Microsoft.Data.SqlClient.SNI | ||
| { | ||
| /// <summary> | ||
| /// This class implements a FIFO Queue with SemaphoreSlim for ordered execution of parallel tasks. | ||
| /// Currently used in Managed SNI (SNISslStream) to override SslStream's WriteAsync implementation. | ||
| /// </summary> | ||
| internal sealed partial class ConcurrentQueueSemaphore | ||
| { | ||
| private readonly SemaphoreSlim _semaphore; | ||
| private readonly ConcurrentQueue<TaskCompletionSource<bool>> _queue; | ||
|
|
||
| public ConcurrentQueueSemaphore(int initialCount) | ||
| { | ||
| _semaphore = new SemaphoreSlim(initialCount); | ||
| _queue = new ConcurrentQueue<TaskCompletionSource<bool>>(); | ||
| } | ||
|
|
||
| public Task WaitAsync(CancellationToken cancellationToken) | ||
| { | ||
| // try sync wait with 0 which will not block to see if we need to do an async wait | ||
| if (_semaphore.Wait(0, cancellationToken)) | ||
| { | ||
| return Task.CompletedTask; | ||
| } | ||
| else | ||
| { | ||
| var tcs = new TaskCompletionSource<bool>(); | ||
| _queue.Enqueue(tcs); | ||
| _semaphore.WaitAsync().ContinueWith( | ||
| continuationAction: static (Task task, object state) => | ||
| { | ||
| ConcurrentQueue<TaskCompletionSource<bool>> queue = (ConcurrentQueue<TaskCompletionSource<bool>>)state; | ||
| if (queue.TryDequeue(out TaskCompletionSource<bool> popped)) | ||
| { | ||
| popped.SetResult(true); | ||
| } | ||
| }, | ||
| state: _queue, | ||
| cancellationToken: cancellationToken | ||
| ); | ||
| return tcs.Task; | ||
| } | ||
| } | ||
|
|
||
| public void Release() | ||
| { | ||
| _semaphore.Release(); | ||
| } | ||
| } | ||
|
|
||
| } |
73 changes: 73 additions & 0 deletions
73
src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNIStreams.Task.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| // 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.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Microsoft.Data.SqlClient.SNI | ||
| { | ||
| // NetCore2.1: | ||
| // DO NOT OVERRIDE ValueTask versions of ReadAsync and WriteAsync because the underlying SslStream implements them | ||
| // by calling the Task versions which are already overridden meaning that if a caller uses Task WriteAsync this would | ||
| // call ValueTask WriteAsync which then called TaskWriteAsync introducing a lock cycle and never return | ||
|
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| internal sealed partial class SNISslStream | ||
| { | ||
| 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(); | ||
| } | ||
| } | ||
|
|
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| 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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| internal sealed partial class SNINetworkStream | ||
| { | ||
| 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(); | ||
| } | ||
| } | ||
| } | ||
| } |
89 changes: 89 additions & 0 deletions
89
...Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNIStreams.ValueTask.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // 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.Threading; | ||
| using System.Threading.Tasks; | ||
| using System; | ||
|
|
||
| namespace Microsoft.Data.SqlClient.SNI | ||
| { | ||
| internal sealed partial class SNISslStream | ||
| { | ||
| public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| return ReadAsync(new Memory<byte>(buffer, offset, count), cancellationToken).AsTask(); | ||
| } | ||
|
|
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| public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default) | ||
| { | ||
| await _readAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| return await base.ReadAsync(buffer, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _readAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
|
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| public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| return WriteAsync(new Memory<byte>(buffer, offset, count), cancellationToken).AsTask(); | ||
| } | ||
|
|
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| public override async ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default) | ||
| { | ||
| await _writeAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| await base.WriteAsync(buffer, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _writeAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| internal sealed partial class SNINetworkStream | ||
| { | ||
| public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| return ReadAsync(new Memory<byte>(buffer, offset, count), cancellationToken).AsTask(); | ||
| } | ||
|
|
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| public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default) | ||
| { | ||
| await _readAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| return await base.ReadAsync(buffer, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _readAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
|
|
||
| // Prevent the WriteAsync collisions by running the task in a Semaphore Slim | ||
| public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken) | ||
| { | ||
| return WriteAsync(new Memory<byte>(buffer, offset, count), cancellationToken).AsTask(); | ||
| } | ||
|
|
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| public override async ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default) | ||
| { | ||
| await _writeAsyncSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false); | ||
| try | ||
| { | ||
| await base.WriteAsync(buffer, cancellationToken).ConfigureAwait(false); | ||
| } | ||
| finally | ||
| { | ||
| _writeAsyncSemaphore.Release(); | ||
| } | ||
| } | ||
| } | ||
| } |
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