more work on api

Pilz.Networking/Api/ApiResult.cs

@@ -0,0 +1,19 @@
+using System.Net;
+
+namespace Pilz.Networking.Api;
+
+public record class ApiResult(
+    HttpStatusCode StatusCode,
+    ApiMessage? Message = null,
+    string? StatusDescription = null)
+{
+    public static ApiResult Ok()
+    {
+        return new(HttpStatusCode.OK);
+    }
+
+    public static ApiResult Ok(ApiMessage message)
+    {
+        return new(HttpStatusCode.OK, message);
+    }
+}

Pilz.Networking/Api/ApiServer.cs

@@ -1,8 +1,6 @@
 using Pilz.Extensions.Reflection;
-using System;
 using System.Net;
 using System.Reflection;
-using System.Reflection.PortableExecutable;
 
 namespace Pilz.Networking.Api;
 
@@ -12,6 +10,8 @@ public class ApiServer(string apiUrl) : ApiClient, IApiServer
     protected readonly Dictionary<Type, IMessageSerializer> serializers = [];
     protected readonly HttpListener httpListener = new();
 
+    protected record PrivateApiResult(ApiResult Original, string? ResultJson);
+
     public string ApiUrl { get; } = apiUrl;
 
     public IMessageSerializer Serializer { get; set; } = new DefaultMessageSerializer();
@@ -40,8 +40,8 @@ public class ApiServer(string apiUrl) : ApiClient, IApiServer
         if (method.GetCustomAttribute<MessageHandlerAttribute>() is not MessageHandlerAttribute attribute
             || method.GetParameters().FirstOrDefault() is not ParameterInfo parameter
             || !parameter.ParameterType.IsAssignableTo(typeof(ApiMessage))
-            || !method.ReturnType.IsAssignableTo(typeof(ApiMessage)))
-            throw new NotSupportedException("The first parameter needs to be of type ApiMessage and must also return an ApiMessage object and the method must have the MessageHAndlerAttribute.");
+            || !method.ReturnType.IsAssignableTo(typeof(ApiResult)))
+            throw new NotSupportedException("The first parameter needs to be of type ApiMessage and must return an ApiResult object and the method must have the MessageHandlerAttribute.");
 
         // Add handler
         handlers.Add(ApiUrl + attribute.Url, handler);
@@ -96,7 +96,7 @@ public class ApiServer(string apiUrl) : ApiClient, IApiServer
         }
     }
 
-    protected virtual string? HandleMessage(string url, string json)
+    protected virtual PrivateApiResult? HandleMessage(string url, string json)
     {
         // Get handler
         if (!handlers.TryGetValue(url, out var handler)
@@ -112,14 +112,19 @@ public class ApiServer(string apiUrl) : ApiClient, IApiServer
             return null;
 
         // Invoke handler
-        if (handler.DynamicInvoke(message) is not ApiMessage result)
+        if (handler.DynamicInvoke(message) is not ApiResult result)
             return null;
 
+        // Return result without message
+        if (result.Message is null)
+            return new(result, null);
+
         // Serializer
-        if (serializer.Serialize(result) is not string resultStr)
+        if (serializer.Serialize(result.Message) is not string resultStr)
             return null;
 
-        return resultStr;
+        // Return result with message
+        return new(result, resultStr);
     }
 
     protected virtual IMessageSerializer GetSerializer(Type? t)