[OpenTelemetry.Extensions] Add baggage Activity processor

.github/component_owners.yml

@@ -82,6 +82,8 @@ components:
     - srprash
     - atshaw43
     - ppittle
+  OpenTelemetry.SpanProcessor.Baggage:
+    - mikegoldsmith
   test/OpenTelemetry.Exporter.Geneva.Benchmark/:
     - cijothomas
     - codeblanch

opentelemetry-dotnet-contrib.sln

@@ -1,4 +1,4 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.0.31912.275
 MinimumVisualStudioVersion = 15.0.26124.0
@@ -344,6 +344,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.ResourceDetec
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenTelemetry.PersistentStorage.Abstractions.Tests", "test\OpenTelemetry.PersistentStorage.Abstractions.Tests\OpenTelemetry.PersistentStorage.Abstractions.Tests.csproj", "{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "OpenTelemetry.SpanProcessor.Baggage", "src\OpenTelemetry.SpanProcessor.Baggage\OpenTelemetry.SpanProcessor.Baggage.csproj", "{04150AB0-2FFF-479E-BBEA-E8F2A3B798F2}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -690,6 +692,10 @@ Global
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{04150AB0-2FFF-479E-BBEA-E8F2A3B798F2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{04150AB0-2FFF-479E-BBEA-E8F2A3B798F2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{04150AB0-2FFF-479E-BBEA-E8F2A3B798F2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{04150AB0-2FFF-479E-BBEA-E8F2A3B798F2}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -793,6 +799,7 @@ Global
 		{033CA8D4-1529-413A-B244-07958D5F9A48} = {22DF5DC0-1290-4E83-A9D8-6BB7DE3B3E63}
 		{36271347-2055-438E-9659-B71542A17A73} = {2097345F-4DD3-477D-BC54-A922F9B2B402}
 		{7AD707F9-DC6D-430A-8834-D5DCD517BF6E} = {2097345F-4DD3-477D-BC54-A922F9B2B402}
+		{04150AB0-2FFF-479E-BBEA-E8F2A3B798F2} = {22DF5DC0-1290-4E83-A9D8-6BB7DE3B3E63}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {B0816796-CDB3-47D7-8C3C-946434DE3B66}

src/OpenTelemetry.SpanProcessor.Baggage/BaggageSpanProcessor.cs

@@ -0,0 +1,23 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+using OpenTelemetry;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace OpenTelemetry.SpanProcessor.Baggage;
+
+/// <summary>
+/// Span processor that adds <see cref="Baggage"/> fields to every new span
+/// </summary>
+public class BaggageSpanProcessor : OpenTelemetry.<Activity>
+{
+    /// <inheritdoc />
+    public override void OnStart(Activity activity)
+    {
+        foreach (var entry in Baggage.Current)
+        {
+            activity.SetTag(entry.Key, entry.Value);
+        }
+    }
+}

src/OpenTelemetry.SpanProcessor.Baggage/CHANGELOG.md

@@ -0,0 +1,6 @@
+# Changelog
+
+## Unreleased
+
+* Adds Baggage span processor.
+  ([#](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1659))

src/OpenTelemetry.SpanProcessor.Baggage/OpenTelemetry.SpanProcessor.Baggage.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <Description>OpenTelemetry baggage span processor</Description>
+    <PackageTags>$(PackageTags);Baggage</PackageTags>
+    <MinVerTagPrefix>SpanProcessor.Baggage-</MinVerTagPrefix>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OpenTelemetry" Version="$(OTelSdkVersion)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="$(RepoRoot)\src\Shared\AssemblyVersionExtensions.cs" Link="Includes\AssemblyVersionExtensions.cs" />
+    <Compile Include="$(RepoRoot)\src\Shared\Guard.cs" Link="Includes\Guard.cs" />
+  </ItemGroup>
+
+</Project>

src/OpenTelemetry.SpanProcessor.Baggage/OpenTelemetry.SpanProcessor.Baggage.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.SpanProcessor.Baggage", "OpenTelemetry.SpanProcessor.Baggage.csproj", "{6048EBF2-EF94-4988-BC6A-073EFF43B18F}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6048EBF2-EF94-4988-BC6A-073EFF43B18F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6048EBF2-EF94-4988-BC6A-073EFF43B18F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6048EBF2-EF94-4988-BC6A-073EFF43B18F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6048EBF2-EF94-4988-BC6A-073EFF43B18F}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {F0DF08BE-C2DC-4921-98E9-E1AA5A796C91}
+	EndGlobalSection
+EndGlobal

src/OpenTelemetry.SpanProcessor.Baggage/README.md

@@ -0,0 +1,42 @@
+# Instana Exporter for OpenTelemetry .NET
+
+[![NuGet version badge](https://img.shields.io/nuget/v/OpenTelemetry.SpanProcessor.Baggage)](https://www.nuget.org/packages/OpenTelemetry.SpanProcessor.Baggage)
+[![NuGet download count badge](https://img.shields.io/nuget/dt/OpenTelemetry.SpanProcessor.Baggage)](https://www.nuget.org/packages/OpenTelemetry.SpanProcessor.Baggage)
+
+The BaggageSpanProcessor reads entries stored in Baggage from the parent context
+and adds the baggage keys and values to the activity as attributes on start.
+
+Add this span processor to a tracer provider.
+
+Warning!
+
+Do not put sensitive information in Baggage.
+
+To repeat: a consequence of adding data to Baggage is that the keys and values
+will appear in all outgoing HTTP headers from the application.
+
+## Installation
+
+```shell
+dotnet add package OpenTelemetry.SpanProcessor.Baggage
+```
+
+### Configure Processor with Trace Provider
+
+This snippet shows how to configure the Instana Exporter for Traces
+
+```csharp
+using var tracerProvider = Sdk.CreateTracerProviderBuilder()
+    .AddSource("DemoSource")
+    .AddProcessor(new BaggageSpanProcessor())
+    .Build();
+```
+
+The above code must be in application startup. In case of ASP.NET Core
+applications, this should be in `ConfigureServices` of `Startup` class.
+For ASP.NET applications, this should be in `Global.aspx.cs`.
+
+## Troubleshooting
+
+Before digging into a problem, check if you hit a known issue by looking at the
+[GitHub issues](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/issues).