feat: update ApplicationHelper

Author: WeihanLi

src/WeihanLi.Common/Helpers/ApplicationHelper.cs

@@ -137,7 +137,7 @@ private static RuntimeInfo GetRuntimeInfo()
 #else
         var currentProcess = System.Diagnostics.Process.GetCurrentProcess();
 #endif
-        return new RuntimeInfo()
+        var runtimeInfo = new RuntimeInfo()
         {
             Version = Environment.Version.ToString(),
             ProcessorCount = Environment.ProcessorCount,
@@ -160,30 +160,41 @@ private static RuntimeInfo GetRuntimeInfo()
 
             IsInContainer = IsInContainer(),
             IsInKubernetes = IsInKubernetesCluster(),
+            KubernetesNamespace = GetKubernetesNamespace(),
 
             LibraryVersion = libInfo.LibraryVersion,
             LibraryHash = libInfo.LibraryHash,
             RepositoryUrl = libInfo.RepositoryUrl,
         };
+        return runtimeInfo;
     }
 
     #region ContainerEnvironment
+    // container environment
+    // https://github.com/dotnet/dotnet-docker/blob/d90d458deada9057d7889f76d58fc0a7194a0c06/src/runtime-deps/6.0/alpine3.20/amd64/Dockerfile#L7
+
+    /// <summary>
+    /// Whether running inside a container
+    /// </summary>
     private static bool IsInContainer()
     {
-        // https://github.com/dotnet/dotnet-docker/blob/9b731e901dd4a343fc30da7b8b3ab7d305a4aff9/src/runtime-deps/7.0/cbl-mariner2.0/amd64/Dockerfile#L18
         return "true".Equals(Environment.GetEnvironmentVariable("DOTNET_RUNNING_IN_CONTAINER"),
             StringComparison.OrdinalIgnoreCase);
     }
 
+    // Kubernetes environment
+    // https://github.com/kubernetes-client/csharp/blob/36a02046439d01f1256aed4e5071cb7f1b57d6eb/src/KubernetesClient/KubernetesClientConfiguration.InCluster.cs#L41
     private static readonly string ServiceAccountPath =
         Path.Combine(
         [
             $"{Path.DirectorySeparatorChar}var", "run", "secrets", "kubernetes.io", "serviceaccount",
         ]);
     private const string ServiceAccountTokenKeyFileName = "token";
     private const string ServiceAccountRootCAKeyFileName = "ca.crt";
+    private const string ServiceAccountNamespaceFileName = "namespace";
+
     /// <summary>
-    /// Whether running in k8s cluster
+    /// Whether running inside a k8s cluster
     /// </summary>
     /// <returns></returns>
     private static bool IsInKubernetesCluster()
@@ -204,8 +215,17 @@ private static bool IsInKubernetesCluster()
         var certPath = Path.Combine(ServiceAccountPath, ServiceAccountRootCAKeyFileName);
         return File.Exists(certPath);
     }
-    #endregion ContainerEnvironment
 
+    /// <summary>
+    /// Get Kubernetes namespace
+    /// </summary>
+    /// <returns>The namespace current workload in</returns>
+    private static string? GetKubernetesNamespace()
+    {
+        var namespaceFilePath = Path.Combine(ServiceAccountPath, ServiceAccountNamespaceFileName);
+        return File.Exists(namespaceFilePath) ? File.ReadAllText(namespaceFilePath).Trim() : null;
+    }
+    #endregion ContainerEnvironment
 }
 
 public class LibraryInfo
@@ -243,4 +263,9 @@ public sealed class RuntimeInfo : LibraryInfo
     /// Is running in a Kubernetes cluster
     /// </summary>
     public required bool IsInKubernetes { get; init; }
+
+    /// <summary>
+    /// Kubernetes namespace when running in a Kubernetes cluster
+    /// </summary>
+    public string? KubernetesNamespace { get; init; }
 }