Provide support for HttpClient

skywalking-csharp.sln

@@ -36,6 +36,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkyWalking.Sample.Backend",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkyWalking.Sample.Frontend", "sample\SkyWalking.Sample.Frontend\SkyWalking.Sample.Frontend.csproj", "{2B4E350E-A1E5-4B4A-A642-BCA6D3887E5A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SkyWalking.Diagnostics.HttpClient", "src\SkyWalking.Diagnostics.HttpClient\SkyWalking.Diagnostics.HttpClient.csproj", "{49DEFCA8-4289-4875-B6A5-35D84B3D2290}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -74,6 +76,10 @@ Global
 		{2B4E350E-A1E5-4B4A-A642-BCA6D3887E5A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2B4E350E-A1E5-4B4A-A642-BCA6D3887E5A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{2B4E350E-A1E5-4B4A-A642-BCA6D3887E5A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{49DEFCA8-4289-4875-B6A5-35D84B3D2290}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{49DEFCA8-4289-4875-B6A5-35D84B3D2290}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{49DEFCA8-4289-4875-B6A5-35D84B3D2290}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{49DEFCA8-4289-4875-B6A5-35D84B3D2290}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -89,6 +95,7 @@ Global
 		{D75B68C5-6788-4871-A63F-F6EB48FB0DC5} = {79ED86A5-E9B9-49B2-9354-C911C079D03E}
 		{80A67B09-83F2-477F-907F-95FFF5B8FEAF} = {844CEACD-4C85-4B15-9E2B-892B01FDA4BB}
 		{2B4E350E-A1E5-4B4A-A642-BCA6D3887E5A} = {844CEACD-4C85-4B15-9E2B-892B01FDA4BB}
+		{49DEFCA8-4289-4875-B6A5-35D84B3D2290} = {79ED86A5-E9B9-49B2-9354-C911C079D03E}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {94C0DA2C-CCCB-4314-93A2-9809B5DD0583}

src/SkyWalking.AspNetCore/SkyWalking.AspNetCore.csproj

@@ -9,7 +9,7 @@
     <PackageTags>SkyWalking;APM</PackageTags>
     <PackageReleaseNotes>
     </PackageReleaseNotes>
-    <RootNamespace>SkyWalking</RootNamespace>
+    <RootNamespace>SkyWalking.AspNetCore</RootNamespace>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.1.0-preview2-final" />

src/SkyWalking.Diagnostics.HttpClient/HttpClientDiagnosticListener.cs

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+using System.Net.Http;
+using Microsoft.Extensions.DiagnosticAdapter;
+using SkyWalking.Context;
+using SkyWalking.Context.Tag;
+using SkyWalking.Context.Trace;
+using SkyWalking.NetworkProtocol.Trace;
+
+namespace SkyWalking.Diagnostics.HttpClient
+{
+    public class HttpClientDiagnosticListener : ITracingDiagnosticListener
+    {
+        public string ListenerName { get; } = "HttpHandlerDiagnosticListener";
+
+        [DiagnosticName("System.Net.Http.Request")]
+        public void HttpRequest(HttpRequestMessage request)
+        {
+            var contextCarrier = new ContextCarrier();
+            var peer = $"{request.RequestUri.Host}:{request.RequestUri.Port}";
+            var span = ContextManager.CreateExitSpan(request.RequestUri.ToString(), contextCarrier, peer);
+            Tags.Url.Set(span, request.RequestUri.ToString());
+            span.AsHttp();
+            span.SetComponent(ComponentsDefine.HttpClient);
+            Tags.HTTP.Method.Set(span, request.Method.ToString());
+            foreach (var item in contextCarrier.Items)
+                request.Headers.Add(item.HeadKey, item.HeadValue);
+        }
+
+        [DiagnosticName("System.Net.Http.Response")]
+        public void HttpResponse(HttpResponseMessage response)
+        {
+            var span = ContextManager.ActiveSpan;
+            if (span != null && span.IsExit)
+            {
+                Tags.StatusCode.Set(span, response.StatusCode.ToString());
+                ContextManager.StopSpan(span);
+            }        
+        }
+    }
+}
\ No newline at end of file

src/SkyWalking.Diagnostics.HttpClient/SkyWalking.Diagnostics.HttpClient.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\..\build\common.props" />
+  <PropertyGroup>
+    <Description>SkyWalking.Diagnostics.HttpClient notifies outgoing Http requests.</Description>
+    <AssemblyTitle>SkyWalking.Diagnostics.HttpClient</AssemblyTitle>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <AssemblyName>SkyWalking.Diagnostics.HttpClient</AssemblyName>
+    <PackageId>SkyWalking.Diagnostics.HttpClient</PackageId>
+    <PackageTags>SkyWalking;APM;Diagnostics;HttpClient</PackageTags>
+    <PackageReleaseNotes>
+    </PackageReleaseNotes>
+    <RootNamespace>SkyWalking.Diagnostics.HttpClient</RootNamespace>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DiagnosticAdapter" Version="2.1.0-preview2-final" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\SkyWalking.Abstractions\SkyWalking.Abstractions.csproj" />
+    <ProjectReference Include="..\SkyWalking.Core\SkyWalking.Core.csproj" />
+  </ItemGroup>
+</Project>
\ No newline at end of file