[Fusion] Add OpenTelemetry instrumentation

src/All.slnx

@@ -177,9 +177,11 @@
   <Folder Name="/HotChocolate/Diagnostics/" />
   <Folder Name="/HotChocolate/Diagnostics/src/">
     <Project Path="HotChocolate/Diagnostics/src/Diagnostics/HotChocolate.Diagnostics.csproj" />
+    <Project Path="HotChocolate/Diagnostics/src/Fusion.Diagnostics/HotChocolate.Fusion.Diagnostics.csproj" />
   </Folder>
   <Folder Name="/HotChocolate/Diagnostics/test/">
     <Project Path="HotChocolate/Diagnostics/test/Diagnostics.Tests/HotChocolate.Diagnostics.Tests.csproj" />
+    <Project Path="HotChocolate/Diagnostics/test/Fusion.Diagnostics.Tests/HotChocolate.Fusion.Diagnostics.Tests.csproj" />
   </Folder>
   <Folder Name="/HotChocolate/Adapters/" />
   <Folder Name="/HotChocolate/Adapters/src/">

src/HotChocolate/Diagnostics/HotChocolate.Diagnostics.slnx

@@ -1,8 +1,10 @@
 <Solution>
   <Folder Name="/src/">
     <Project Path="src/Diagnostics/HotChocolate.Diagnostics.csproj" />
+    <Project Path="src/Fusion.Diagnostics/HotChocolate.Fusion.Diagnostics.csproj" />
   </Folder>
   <Folder Name="/test/">
     <Project Path="test/Diagnostics.Tests/HotChocolate.Diagnostics.Tests.csproj" />
+    <Project Path="test/Fusion.Diagnostics.Tests/HotChocolate.Fusion.Diagnostics.Tests.csproj" />
   </Folder>
 </Solution>

src/HotChocolate/Diagnostics/src/Diagnostics/ActivityEnricher.cs

@@ -31,13 +31,13 @@ public class ActivityEnricher
     /// <summary>
     /// Initializes a new instance of <see cref="ActivityEnricher"/>.
     /// </summary>
-    /// <param name="stringBuilderPoolPool"></param>
+    /// <param name="stringBuilderPool"></param>
     /// <param name="options"></param>
     protected ActivityEnricher(
-        ObjectPool<StringBuilder> stringBuilderPoolPool,
+        ObjectPool<StringBuilder> stringBuilderPool,
         InstrumentationOptions options)
     {
-        StringBuilderPool = stringBuilderPoolPool;
+        StringBuilderPool = stringBuilderPool;
         _options = options;
     }
 

src/HotChocolate/Diagnostics/src/Diagnostics/Extensions/DiagnosticsRequestExecutorBuilderExtensions.cs

@@ -82,9 +82,9 @@ public static IRequestExecutorBuilder AddInstrumentation(
     private sealed class InternalActivityEnricher : ActivityEnricher
     {
         public InternalActivityEnricher(
-            ObjectPool<StringBuilder> stringBuilderPoolPool,
+            ObjectPool<StringBuilder> stringBuilderPool,
             InstrumentationOptions options)
-            : base(stringBuilderPoolPool, options)
+            : base(stringBuilderPool, options)
         {
         }
     }

src/HotChocolate/Diagnostics/src/Fusion.Diagnostics/ContextKeys.cs

@@ -0,0 +1,10 @@
+namespace HotChocolate.Fusion.Diagnostics;
+
+internal static class ContextKeys
+{
+    public const string HttpRequestActivity = "HotChocolate.Fusion.Diagnostics.HttpRequest";
+    public const string ParseHttpRequestActivity = "HotChocolate.Fusion.Diagnostics.ParseHttpRequest";
+    public const string FormatHttpResponseActivity = "HotChocolate.Fusion.Diagnostics.FormatHttpResponse";
+    public const string RequestActivity = "HotChocolate.Fusion.Diagnostics.Request";
+    public const string ValidateActivity = "HotChocolate.Fusion.Diagnostics.Validate";
+}

src/HotChocolate/Diagnostics/src/Fusion.Diagnostics/Extensions/DiagnosticsFusionGatewayBuilderExtensions.cs

@@ -0,0 +1,58 @@
+using System.Text;
+using HotChocolate.Fusion.Diagnostics;
+using HotChocolate.Fusion.Diagnostics.Listeners;
+using HotChocolate.Fusion.Configuration;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+using Microsoft.Extensions.ObjectPool;
+
+namespace Microsoft.Extensions.DependencyInjection;
+
+public static class DiagnosticsFusionGatewayBuilderExtensions
+{
+    public static IFusionGatewayBuilder AddInstrumentation(
+        this IFusionGatewayBuilder builder,
+        Action<InstrumentationOptions>? options = null)
+        => AddInstrumentation(builder, (_, opt) => options?.Invoke(opt));
+
+    public static IFusionGatewayBuilder AddInstrumentation(
+        this IFusionGatewayBuilder builder,
+        Action<IServiceProvider, InstrumentationOptions> options)
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+        ArgumentNullException.ThrowIfNull(options);
+
+        builder.Services.TryAddSingleton(
+            sp =>
+            {
+                var optionInst = new InstrumentationOptions();
+                options(sp, optionInst);
+                return optionInst;
+            });
+
+        builder.Services.TryAddSingleton<InternalActivityEnricher>();
+
+        builder.AddDiagnosticEventListener(
+            sp => new ActivityFusionExecutionDiagnosticEventListener(
+                sp.GetService<FusionActivityEnricher>() ??
+                    sp.GetRequiredService<InternalActivityEnricher>(),
+                sp.GetRequiredService<InstrumentationOptions>()));
+
+        builder.AddDiagnosticEventListener(
+            sp => new ActivityServerDiagnosticListener(
+                sp.GetService<FusionActivityEnricher>() ??
+                    sp.GetRequiredService<InternalActivityEnricher>(),
+                sp.GetRequiredService<InstrumentationOptions>()));
+
+        return builder;
+    }
+
+    private sealed class InternalActivityEnricher : FusionActivityEnricher
+    {
+        public InternalActivityEnricher(
+            ObjectPool<StringBuilder> stringBuilderPool,
+            InstrumentationOptions options)
+            : base(stringBuilderPool, options)
+        {
+        }
+    }
+}

src/HotChocolate/Diagnostics/src/Fusion.Diagnostics/Extensions/TracerProviderBuilderExtensions.cs

@@ -0,0 +1,27 @@
+using HotChocolate.Fusion.Diagnostics;
+
+namespace OpenTelemetry.Trace;
+
+/// <summary>
+/// Provides configuration methods to open-telemetry.
+/// </summary>
+public static class TracerProviderBuilderExtensions
+{
+    /// <summary>
+    /// Adds the Hot Chocolate Fusion instrumentation to open-telemetry.
+    /// </summary>
+    /// <param name="builder">
+    /// The tracing builder.
+    /// </param>
+    /// <returns>
+    /// Returns the tracing builder for configuration chaining.
+    /// </returns>
+    public static TracerProviderBuilder AddHotChocolateFusionInstrumentation(
+        this TracerProviderBuilder builder)
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+
+        builder.AddSource(HotChocolateFusionActivitySource.GetName());
+        return builder;
+    }
+}