add server status & capabilities

Pilz.Net/Api/Server/ServerStatusHandler.cs

@@ -0,0 +1,41 @@
+using Pilz.Extensions;
+using Pilz.Extensions.Reflection;
+using Pilz.Net.Api.Messages;
+using System.Diagnostics;
+using System.Reflection;
+
+namespace Pilz.Net.Api.Server;
+
+public class ServerStatusHandler : IApiHandlerInitializer
+{
+    protected IApiServer? server;
+
+    public string Route { get; set; } = "/status";
+
+    public virtual void Initialize(IApiServer server)
+    {
+        this.server = server;
+        server.RegisterHandler(GetType().GetMethod(nameof(GetStatus))!.CreateDelegate(this), new(Route, "GET"), Debugger.IsAttached);
+    }
+
+    public virtual ApiResult GetStatus(ApiRequestInfo req)
+    {
+        var msg = BuildMessage(req);
+
+        if (server is ApiServer apiServer && msg is ServerStatusMessage message)
+        {
+            message.AppVersion ??= Assembly.GetEntryAssembly()?.GetAppVersion();
+            message.ApiVersion = apiServer.ApiVersion;
+            message.EndpointsCount = apiServer.HandlersCount;
+            message.DataManagersCount = apiServer.ManagersCount;
+            message.RestartAttempts = apiServer.RestartAttempts;
+        }
+
+        return ApiResult.Ok(msg);
+    }
+
+    protected virtual ApiMessage? BuildMessage(ApiRequestInfo req)
+    {
+        return new ServerStatusMessage();
+    }
+}