From 5c4408c8cc662deb5abf768e023229aa55807acf Mon Sep 17 00:00:00 2001
From: Sebastian <sebastian@squidex.io>
Date: Sun, 20 Nov 2022 17:00:41 +0100
Subject: [PATCH] Added zipkin support for OTLP.

---
 .../APM/Zipkin/ZipkinPlugin.cs                | 44 +++++++++++++++++++
 .../Squidex.Extensions.csproj                 |  1 +
 backend/src/Squidex/appsettings.json          |  7 +++
 3 files changed, 52 insertions(+)
 create mode 100644 backend/extensions/Squidex.Extensions/APM/Zipkin/ZipkinPlugin.cs

diff --git a/backend/extensions/Squidex.Extensions/APM/Zipkin/ZipkinPlugin.cs b/backend/extensions/Squidex.Extensions/APM/Zipkin/ZipkinPlugin.cs
new file mode 100644
index 0000000000..e94073116d
--- /dev/null
+++ b/backend/extensions/Squidex.Extensions/APM/Zipkin/ZipkinPlugin.cs
@@ -0,0 +1,44 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using OpenTelemetry.Trace;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.Plugins;
+
+namespace Squidex.Extensions.APM.Zipkin;
+
+public sealed class ZipkinPlugin : IPlugin
+{
+    private sealed class Configurator : ITelemetryConfigurator
+    {
+        private readonly IConfiguration config;
+
+        public Configurator(IConfiguration config)
+        {
+            this.config = config;
+        }
+
+        public void Configure(TracerProviderBuilder builder)
+        {
+            builder.AddZipkinExporter(options =>
+            {
+                config.GetSection("logging:zipkin").Bind(options);
+            });
+        }
+    }
+
+    public void ConfigureServices(IServiceCollection services, IConfiguration config)
+    {
+        if (config.GetValue<bool>("logging:zipkin:enabled"))
+        {
+            services.AddSingleton<ITelemetryConfigurator,
+                Configurator>();
+        }
+    }
+}
diff --git a/backend/extensions/Squidex.Extensions/Squidex.Extensions.csproj b/backend/extensions/Squidex.Extensions/Squidex.Extensions.csproj
index f0915c5cf5..be687262cc 100644
--- a/backend/extensions/Squidex.Extensions/Squidex.Extensions.csproj
+++ b/backend/extensions/Squidex.Extensions/Squidex.Extensions.csproj
@@ -32,6 +32,7 @@
 	<PackageReference Include="OpenSearch.Net" Version="1.2.0" />
 	<PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.3.1" />
 	<PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.3.1" />
+	<PackageReference Include="OpenTelemetry.Exporter.Zipkin" Version="1.3.1" />
 	<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.0.0-rc8" />
 	<PackageReference Include="RefactoringEssentials" Version="5.6.0" PrivateAssets="all" />
 	<PackageReference Include="Squidex.OpenTelemetry.Exporter.Stackdriver" Version="0.0.0-alpha.0.384" />
diff --git a/backend/src/Squidex/appsettings.json b/backend/src/Squidex/appsettings.json
index 4748e41c74..0c9ab7f877 100644
--- a/backend/src/Squidex/appsettings.json
+++ b/backend/src/Squidex/appsettings.json
@@ -343,6 +343,13 @@
             "sampling": 1.0
         },
 
+        "zipkin": {
+            // True, to enable Zipkin integration.
+            "enabled": false,
+
+            "endpoint": "http://localhost:9411/api/v2/spans"
+        },
+
         "applicationInsights": {
             // True, to enable application insights integraon.
             "enabled": false,