Issue #4: add structured logging and metrics foundation

2026-04-26 16:10:58 -04:00
parent 16c18954b6
commit 7dfec6dc8c
13 changed files with 692 additions and 1 deletions
@@ -0,0 +1,57 @@
+using Microsoft.Extensions.Primitives;
+
+namespace MxGateway.Server.Diagnostics;
+
+public static class GatewayRequestLoggingMiddlewareExtensions
+{
+    public const string SessionIdHeaderName = "x-session-id";
+    public const string WorkerProcessIdHeaderName = "x-worker-process-id";
+    public const string CorrelationIdHeaderName = "x-correlation-id";
+    public const string CommandMethodHeaderName = "x-command-method";
+
+    public static IApplicationBuilder UseGatewayRequestLoggingScope(this IApplicationBuilder app)
+    {
+        ArgumentNullException.ThrowIfNull(app);
+
+        return app.Use(async (context, next) =>
+        {
+            ILogger logger = context.RequestServices
+                .GetRequiredService<ILoggerFactory>()
+                .CreateLogger("MxGateway.Request");
+
+            using IDisposable? scope = logger.BeginGatewayScope(new GatewayLogScope(
+                SessionId: ReadHeader(context, SessionIdHeaderName),
+                WorkerProcessId: ReadInt32Header(context, WorkerProcessIdHeaderName),
+                CorrelationId: ReadUInt64Header(context, CorrelationIdHeaderName),
+                CommandMethod: ReadHeader(context, CommandMethodHeaderName),
+                ClientIdentity: ReadHeader(context, "authorization")));
+
+            await next(context);
+        });
+    }
+
+    private static string? ReadHeader(HttpContext context, string headerName)
+    {
+        return context.Request.Headers.TryGetValue(headerName, out StringValues values)
+            ? values.ToString()
+            : null;
+    }
+
+    private static int? ReadInt32Header(HttpContext context, string headerName)
+    {
+        string? value = ReadHeader(context, headerName);
+
+        return int.TryParse(value, out int parsedValue)
+            ? parsedValue
+            : null;
+    }
+
+    private static ulong? ReadUInt64Header(HttpContext context, string headerName)
+    {
+        string? value = ReadHeader(context, headerName);
+
+        return ulong.TryParse(value, out ulong parsedValue)
+            ? parsedValue
+            : null;
+    }
+}