Adds PipeWriterAdapter

.gitignore

@@ -30,3 +30,4 @@ project.lock.json
 /.vs/
 .vscode/
 global.json
+BenchmarkDotNet.Artifacts/

benchmarks/Microsoft.AspNetCore.Http.Performance/StreamPipeWriterBenchmark.cs

@@ -0,0 +1,89 @@
+// 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;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Attributes;
+
+namespace Microsoft.AspNetCore.Http
+{
+    public class StreamPipeWriterBenchmark
+    {
+        private Stream _memoryStream;
+        private StreamPipeWriter _pipeWriter;
+        private static byte[] _helloWorldBytes = Encoding.ASCII.GetBytes("Hello World");
+        private static byte[] _largeWrite = Encoding.ASCII.GetBytes(new string('a', 50000));
+
+        [IterationSetup]
+        public void Setup()
+        {
+            _memoryStream = new NoopStream();
+            _pipeWriter = new StreamPipeWriter(_memoryStream);
+        }
+
+        [Benchmark]
+        public async Task WriteHelloWorld()
+        {
+            await _pipeWriter.WriteAsync(_helloWorldBytes);
+        }
+
+        [Benchmark]
+        public async Task WriteHelloWorldLargeWrite()
+        {
+            await _pipeWriter.WriteAsync(_largeWrite);
+        }
+
+        public class NoopStream : Stream
+        {
+            public override bool CanRead => false;
+
+            public override bool CanSeek => throw new System.NotImplementedException();
+
+            public override bool CanWrite => true;
+
+            public override long Length => throw new System.NotImplementedException();
+
+            public override long Position { get => throw new System.NotImplementedException(); set => throw new System.NotImplementedException(); }
+
+            public override void Flush()
+            {
+            }
+
+            public override int Read(byte[] buffer, int offset, int count)
+            {
+                throw new System.NotImplementedException();
+            }
+
+            public override long Seek(long offset, SeekOrigin origin)
+            {
+                throw new System.NotImplementedException();
+            }
+
+            public override void SetLength(long value)
+            {
+            }
+
+            public override void Write(byte[] buffer, int offset, int count)
+            {
+            }
+
+            public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+            {
+                return Task.CompletedTask;
+            }
+
+            public override ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default(CancellationToken))
+            {
+                return default(ValueTask);
+            }
+
+            public override Task FlushAsync(CancellationToken cancellationToken)
+            {
+                return Task.CompletedTask;
+            }
+        }
+    }
+}

build/dependencies.props

@@ -24,6 +24,7 @@
     <MoqPackageVersion>4.9.0</MoqPackageVersion>
     <NETStandardLibrary20PackageVersion>2.0.3</NETStandardLibrary20PackageVersion>
     <SystemBuffersPackageVersion>4.6.0-preview1-26907-04</SystemBuffersPackageVersion>
+    <SystemIOPipelinesPackageVersion>4.6.0-preview1-26907-04</SystemIOPipelinesPackageVersion>
     <SystemTextEncodingsWebPackageVersion>4.6.0-preview1-26907-04</SystemTextEncodingsWebPackageVersion>
     <XunitAnalyzersPackageVersion>0.10.0</XunitAnalyzersPackageVersion>
     <XunitPackageVersion>2.3.1</XunitPackageVersion>

src/Microsoft.AspNetCore.Http/Microsoft.AspNetCore.Http.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>ASP.NET Core default HTTP feature implementations.</Description>
-    <TargetFramework>netstandard2.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;netcoreapp2.2</TargetFrameworks>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
@@ -19,6 +19,7 @@
     <PackageReference Include="Microsoft.Extensions.CopyOnWriteDictionary.Sources" PrivateAssets="All" Version="$(MicrosoftExtensionsCopyOnWriteDictionarySourcesPackageVersion)" />
     <PackageReference Include="Microsoft.Extensions.ObjectPool" Version="$(MicrosoftExtensionsObjectPoolPackageVersion)" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="$(MicrosoftExtensionsOptionsPackageVersion)" />
+    <PackageReference Include="System.IO.Pipelines" Version="$(SystemIOPipelinesPackageVersion)" />
   </ItemGroup>
 
 </Project>