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Porting PR 34184 from dotnet/corefx#34184 Optimizes allocations in the async read and write paths for SqlClient's managed SNI implementation
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Saurabh Singh (SQL)
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Jan 2, 2019
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118 changes: 118 additions & 0 deletions
118
src/Microsoft.Data.SqlClient/netcore/src/System/Data/SqlClient/SNI/SNIPacket.NetCoreApp.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // 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.Buffers; | ||
| using System.IO; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Microsoft.Data.SqlClient.SNI | ||
| { | ||
| internal partial class SNIPacket | ||
| { | ||
| /// <summary> | ||
| /// Read data from a stream asynchronously | ||
| /// </summary> | ||
| /// <param name="stream">Stream to read from</param> | ||
| /// <param name="callback">Completion callback</param> | ||
| public void ReadFromStreamAsync(Stream stream, SNIAsyncCallback callback) | ||
| { | ||
| // Treat local function as a static and pass all params otherwise as async will allocate | ||
| async Task ReadFromStreamAsync(SNIPacket packet, SNIAsyncCallback cb, ValueTask<int> valueTask) | ||
| { | ||
| bool error = false; | ||
| try | ||
| { | ||
| packet._length = await valueTask.ConfigureAwait(false); | ||
| if (packet._length == 0) | ||
| { | ||
| SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.TCP_PROV, 0, SNICommon.ConnTerminatedError, string.Empty); | ||
| error = true; | ||
| } | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.TCP_PROV, SNICommon.InternalExceptionError, ex); | ||
| error = true; | ||
| } | ||
|
|
||
| if (error) | ||
| { | ||
| packet.Release(); | ||
| } | ||
|
|
||
| cb(packet, error ? TdsEnums.SNI_ERROR : TdsEnums.SNI_SUCCESS); | ||
| } | ||
|
|
||
| ValueTask<int> vt = stream.ReadAsync(new Memory<byte>(_data, 0, _capacity), CancellationToken.None); | ||
|
|
||
| if (vt.IsCompletedSuccessfully) | ||
| { | ||
| _length = vt.Result; | ||
| // Zero length to go via async local function as is error condition | ||
| if (_length > 0) | ||
| { | ||
| callback(this, TdsEnums.SNI_SUCCESS); | ||
|
|
||
| // Completed | ||
| return; | ||
| } | ||
| } | ||
|
|
||
| // Not complete or error call the async local function to complete | ||
| _ = ReadFromStreamAsync(this, callback, vt); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Write data to a stream asynchronously | ||
| /// </summary> | ||
| /// <param name="stream">Stream to write to</param> | ||
| public void WriteToStreamAsync(Stream stream, SNIAsyncCallback callback, SNIProviders provider, bool disposeAfterWriteAsync = false) | ||
| { | ||
| // Treat local function as a static and pass all params otherwise as async will allocate | ||
| async Task WriteToStreamAsync(SNIPacket packet, SNIAsyncCallback cb, SNIProviders providers, bool disposeAfter, ValueTask valueTask) | ||
| { | ||
| uint status = TdsEnums.SNI_SUCCESS; | ||
| try | ||
| { | ||
| await valueTask.ConfigureAwait(false); | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| SNILoadHandle.SingletonInstance.LastError = new SNIError(providers, SNICommon.InternalExceptionError, e); | ||
| status = TdsEnums.SNI_ERROR; | ||
| } | ||
|
|
||
| cb(packet, status); | ||
|
|
||
| if (disposeAfter) | ||
| { | ||
| packet.Dispose(); | ||
| } | ||
| } | ||
|
|
||
| ValueTask vt = stream.WriteAsync(new Memory<byte>(_data, 0, _length), CancellationToken.None); | ||
|
|
||
| if (vt.IsCompletedSuccessfully) | ||
| { | ||
| // Read the result to register as complete for the ValueTask | ||
| vt.GetAwaiter().GetResult(); | ||
|
|
||
| callback(this, TdsEnums.SNI_SUCCESS); | ||
|
|
||
| if (disposeAfterWriteAsync) | ||
| { | ||
| Dispose(); | ||
| } | ||
|
|
||
| // Completed | ||
| return; | ||
| } | ||
|
|
||
| // Not complete or error call the async local function to complete | ||
| _ = WriteToStreamAsync(this, callback, provider, disposeAfterWriteAsync, vt); | ||
| } | ||
| } | ||
| } |
118 changes: 118 additions & 0 deletions
118
src/Microsoft.Data.SqlClient/netcore/src/System/Data/SqlClient/SNI/SNIPacket.NetStandard.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // 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.Buffers; | ||
| using System.IO; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
|
|
||
| namespace Microsoft.Data.SqlClient.SNI | ||
| { | ||
| internal partial class SNIPacket | ||
| { | ||
| /// <summary> | ||
| /// Read data from a stream asynchronously | ||
| /// </summary> | ||
| /// <param name="stream">Stream to read from</param> | ||
| /// <param name="callback">Completion callback</param> | ||
| public void ReadFromStreamAsync(Stream stream, SNIAsyncCallback callback) | ||
| { | ||
| // Treat local function as a static and pass all params otherwise as async will allocate | ||
| async Task ReadFromStreamAsync(SNIPacket packet, SNIAsyncCallback cb, Task<int> task) | ||
| { | ||
| bool error = false; | ||
| try | ||
| { | ||
| packet._length = await task.ConfigureAwait(false); | ||
| if (packet._length == 0) | ||
| { | ||
| SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.TCP_PROV, 0, SNICommon.ConnTerminatedError, string.Empty); | ||
| error = true; | ||
| } | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.TCP_PROV, SNICommon.InternalExceptionError, ex); | ||
| error = true; | ||
| } | ||
|
|
||
| if (error) | ||
| { | ||
| packet.Release(); | ||
| } | ||
|
|
||
| cb(packet, error ? TdsEnums.SNI_ERROR : TdsEnums.SNI_SUCCESS); | ||
| } | ||
|
|
||
| Task<int> t = stream.ReadAsync(_data, 0, _capacity, CancellationToken.None); | ||
|
|
||
| if ((t.Status & TaskStatus.RanToCompletion) != 0) | ||
| { | ||
| _length = t.Result; | ||
| // Zero length to go via async local function as is error condition | ||
| if (_length > 0) | ||
| { | ||
| callback(this, TdsEnums.SNI_SUCCESS); | ||
|
|
||
| // Completed | ||
| return; | ||
| } | ||
| } | ||
|
|
||
| // Not complete or error call the async local function to complete | ||
| _ = ReadFromStreamAsync(this, callback, t); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Write data to a stream asynchronously | ||
| /// </summary> | ||
| /// <param name="stream">Stream to write to</param> | ||
| public void WriteToStreamAsync(Stream stream, SNIAsyncCallback callback, SNIProviders provider, bool disposeAfterWriteAsync = false) | ||
| { | ||
| // Treat local function as a static and pass all params otherwise as async will allocate | ||
| async Task WriteToStreamAsync(SNIPacket packet, SNIAsyncCallback cb, SNIProviders providers, bool disposeAfter, Task task) | ||
| { | ||
| uint status = TdsEnums.SNI_SUCCESS; | ||
| try | ||
| { | ||
| await task.ConfigureAwait(false); | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| SNILoadHandle.SingletonInstance.LastError = new SNIError(providers, SNICommon.InternalExceptionError, e); | ||
| status = TdsEnums.SNI_ERROR; | ||
| } | ||
|
|
||
| cb(packet, status); | ||
|
|
||
| if (disposeAfter) | ||
| { | ||
| packet.Dispose(); | ||
| } | ||
| } | ||
|
|
||
| Task t = stream.WriteAsync(_data, 0, _length, CancellationToken.None); | ||
|
|
||
| if ((t.Status & TaskStatus.RanToCompletion) != 0) | ||
| { | ||
| // Read the result to register as complete for the Task | ||
| t.GetAwaiter().GetResult(); | ||
|
|
||
| callback(this, TdsEnums.SNI_SUCCESS); | ||
|
|
||
| if (disposeAfterWriteAsync) | ||
| { | ||
| Dispose(); | ||
| } | ||
|
|
||
| // Completed | ||
| return; | ||
| } | ||
|
|
||
| // Not complete or error call the async local function to complete | ||
| _ = WriteToStreamAsync(this, callback, provider, disposeAfterWriteAsync, t); | ||
| } | ||
| } | ||
| } |
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