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Transport agnostic kestrel refactoring (#1551)
- Add transport interfaces - Create separate Core and Libuv projects #828
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...ver.Kestrel/Adapter/IConnectionAdapter.cs → ...estrel.Core/Adapter/IConnectionAdapter.cs
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src/Microsoft.AspNetCore.Server.Kestrel.Core/Internal/ConnectionHandler.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| // Copyright (c) .NET Foundation. All rights reserved. | ||
| // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. | ||
|
|
||
| using System; | ||
| using System.IO.Pipelines; | ||
| using System.Threading; | ||
| using Microsoft.AspNetCore.Hosting.Server; | ||
| using Microsoft.AspNetCore.Server.Kestrel.Internal.Http; | ||
| using Microsoft.AspNetCore.Server.Kestrel.Transport; | ||
|
|
||
| namespace Microsoft.AspNetCore.Server.Kestrel.Internal | ||
| { | ||
| public class ConnectionHandler<TContext> : IConnectionHandler | ||
| { | ||
| // Base32 encoding - in ascii sort order for easy text based sorting | ||
| private static readonly string _encode32Chars = "0123456789ABCDEFGHIJKLMNOPQRSTUV"; | ||
|
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| // Seed the _lastConnectionId for this application instance with | ||
| // the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001 | ||
| // for a roughly increasing _requestId over restarts | ||
| private static long _lastConnectionId = DateTime.UtcNow.Ticks; | ||
|
|
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| private readonly ServiceContext _serviceContext; | ||
| private readonly IHttpApplication<TContext> _application; | ||
|
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| public ConnectionHandler(ServiceContext serviceContext, IHttpApplication<TContext> application) | ||
| { | ||
| _serviceContext = serviceContext; | ||
| _application = application; | ||
| } | ||
|
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| public IConnectionContext OnConnection(IConnectionInformation connectionInfo) | ||
| { | ||
| var inputPipe = connectionInfo.PipeFactory.Create(GetInputPipeOptions(connectionInfo.InputWriterScheduler)); | ||
| var outputPipe = connectionInfo.PipeFactory.Create(GetOutputPipeOptions(connectionInfo.OutputWriterScheduler)); | ||
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| var connectionId = GenerateConnectionId(Interlocked.Increment(ref _lastConnectionId)); | ||
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| var frameContext = new FrameContext | ||
| { | ||
| ConnectionId = connectionId, | ||
| ConnectionInformation = connectionInfo, | ||
| ServiceContext = _serviceContext | ||
| }; | ||
|
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| // TODO: Untangle this mess | ||
| var frame = new Frame<TContext>(_application, frameContext); | ||
| var outputProducer = new SocketOutputProducer(outputPipe.Writer, frame, connectionId, _serviceContext.Log); | ||
| frame.LifetimeControl = new ConnectionLifetimeControl(connectionId, outputPipe.Reader, outputProducer, _serviceContext.Log); | ||
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| var connection = new FrameConnection(new FrameConnectionContext | ||
| { | ||
| ConnectionId = connectionId, | ||
| ServiceContext = _serviceContext, | ||
| PipeFactory = connectionInfo.PipeFactory, | ||
| ConnectionAdapters = connectionInfo.ListenOptions.ConnectionAdapters, | ||
| Frame = frame, | ||
| Input = inputPipe, | ||
| Output = outputPipe, | ||
| OutputProducer = outputProducer | ||
| }); | ||
|
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| // Since data cannot be added to the inputPipe by the transport until OnConnection returns, | ||
| // Frame.RequestProcessingAsync is guaranteed to unblock the transport thread before calling | ||
| // application code. | ||
| connection.StartRequestProcessing(); | ||
|
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| return connection; | ||
| } | ||
|
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| // Internal for testing | ||
| internal PipeOptions GetInputPipeOptions(IScheduler writerScheduler) => new PipeOptions | ||
| { | ||
| ReaderScheduler = _serviceContext.ThreadPool, | ||
| WriterScheduler = writerScheduler, | ||
| MaximumSizeHigh = _serviceContext.ServerOptions.Limits.MaxRequestBufferSize ?? 0, | ||
| MaximumSizeLow = _serviceContext.ServerOptions.Limits.MaxRequestBufferSize ?? 0 | ||
| }; | ||
|
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| internal PipeOptions GetOutputPipeOptions(IScheduler readerScheduler) => new PipeOptions | ||
| { | ||
| ReaderScheduler = readerScheduler, | ||
| WriterScheduler = _serviceContext.ThreadPool, | ||
| MaximumSizeHigh = GetOutputResponseBufferSize(), | ||
| MaximumSizeLow = GetOutputResponseBufferSize() | ||
| }; | ||
|
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| private long GetOutputResponseBufferSize() | ||
| { | ||
| var bufferSize = _serviceContext.ServerOptions.Limits.MaxResponseBufferSize; | ||
| if (bufferSize == 0) | ||
| { | ||
| // 0 = no buffering so we need to configure the pipe so the the writer waits on the reader directly | ||
| return 1; | ||
| } | ||
|
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| // null means that we have no back pressure | ||
| return bufferSize ?? 0; | ||
| } | ||
|
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| private static unsafe string GenerateConnectionId(long id) | ||
| { | ||
| // The following routine is ~310% faster than calling long.ToString() on x64 | ||
| // and ~600% faster than calling long.ToString() on x86 in tight loops of 1 million+ iterations | ||
| // See: https://github.com/aspnet/Hosting/pull/385 | ||
|
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| // stackalloc to allocate array on stack rather than heap | ||
| char* charBuffer = stackalloc char[13]; | ||
|
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| charBuffer[0] = _encode32Chars[(int)(id >> 60) & 31]; | ||
| charBuffer[1] = _encode32Chars[(int)(id >> 55) & 31]; | ||
| charBuffer[2] = _encode32Chars[(int)(id >> 50) & 31]; | ||
| charBuffer[3] = _encode32Chars[(int)(id >> 45) & 31]; | ||
| charBuffer[4] = _encode32Chars[(int)(id >> 40) & 31]; | ||
| charBuffer[5] = _encode32Chars[(int)(id >> 35) & 31]; | ||
| charBuffer[6] = _encode32Chars[(int)(id >> 30) & 31]; | ||
| charBuffer[7] = _encode32Chars[(int)(id >> 25) & 31]; | ||
| charBuffer[8] = _encode32Chars[(int)(id >> 20) & 31]; | ||
| charBuffer[9] = _encode32Chars[(int)(id >> 15) & 31]; | ||
| charBuffer[10] = _encode32Chars[(int)(id >> 10) & 31]; | ||
| charBuffer[11] = _encode32Chars[(int)(id >> 5) & 31]; | ||
| charBuffer[12] = _encode32Chars[(int)id & 31]; | ||
|
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| // string ctor overload that takes char* | ||
| return new string(charBuffer, 0, 13); | ||
| } | ||
| } | ||
| } |
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