Adding setting for automated session serialization on shutdown

- adding automated session serialization on application ending (console or shutdown/logoff)
- adding console class for managing system events

TelegramBotBase/BotBase.cs

@@ -75,6 +75,7 @@ namespace TelegramBotBase
             SetSetting(eSettings.NavigationMaximum, 10);
             SetSetting(eSettings.LogAllMessages, false);
             SetSetting(eSettings.SkipAllMessages, false);
+            SetSetting(eSettings.SafeSessionsOnConsoleExit, false);
 
             this.BotCommands = new List<BotCommand>();
 
@@ -166,6 +167,15 @@ namespace TelegramBotBase
                 this.Sessions.LoadSessionStates(this.StateMachine);
             }
 
+            //Enable auto session safe
+            if (this.GetSetting(eSettings.SafeSessionsOnConsoleExit, false))
+            {
+                TelegramBotBase.Tools.Console.SetHandler(() =>
+                {
+                    this.Sessions.SaveSessionStates(this.StateMachine);
+                });
+            }
+
             this.Client.TelegramClient.StartReceiving();
         }
 

TelegramBotBase/Enums/eSettings.cs

@@ -24,6 +24,10 @@ namespace TelegramBotBase.Enums
         SkipAllMessages = 3,
 
 
+        /// <summary>
+        /// Does stick to the console event handler and safes all sessions on exit.
+        /// </summary>
+        SafeSessionsOnConsoleExit = 4
 
 
 

TelegramBotBase/Tools/Console.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace TelegramBotBase.Tools
+{
+    public static class Console
+    {
+        [DllImport("Kernel32")]
+        private static extern bool SetConsoleCtrlHandler(EventHandler handler, bool add);
+
+        private delegate bool EventHandler(CtrlType sig);
+        static EventHandler _handler;
+
+        static List<Action> Actions = new List<Action>();
+
+        enum CtrlType
+        {
+            CTRL_C_EVENT = 0,
+            CTRL_BREAK_EVENT = 1,
+            CTRL_CLOSE_EVENT = 2,
+            CTRL_LOGOFF_EVENT = 5,
+            CTRL_SHUTDOWN_EVENT = 6
+        }
+
+        static Console()
+        {
+
+        }
+
+        public static void SetHandler(Action action)
+        {
+            Actions.Add(action);
+
+            if (_handler != null)
+                return;
+
+            _handler += new EventHandler(Handler);
+            SetConsoleCtrlHandler(_handler, true);
+        }
+
+        private static bool Handler(CtrlType sig)
+        {
+            switch (sig)
+            {
+                case CtrlType.CTRL_C_EVENT:
+                case CtrlType.CTRL_LOGOFF_EVENT:
+                case CtrlType.CTRL_SHUTDOWN_EVENT:
+                case CtrlType.CTRL_CLOSE_EVENT:
+
+                    foreach (var a in Actions)
+                    {
+                        a();
+                    }
+
+                    return false;
+
+                default:
+                    return false;
+            }
+        }
+
+    }
+}