Avvisa se server backup non raggiungibile

src/bakrest/tray_app.py

@@ -4,6 +4,7 @@ import argparse
 import json
 import logging
 import threading
+import time
 import tkinter as tk
 from tkinter import messagebox
 from pathlib import Path
@@ -23,6 +24,8 @@ class BakRestTrayApp:
         self.config = config
         self.logger = logger
         self.registry = ChangeRegistry(config.storage.change_registry)
+        self.stop_event = threading.Event()
+        self.last_alert_reachable: bool | None = None
         self.icon = pystray.Icon(
             "BakRestTray",
             _create_icon_image(),
@@ -32,6 +35,7 @@ class BakRestTrayApp:
 
     def run(self) -> None:
         self.logger.info("BakRestTray started")
+        threading.Thread(target=self._server_status_monitor, daemon=True).start()
         self.icon.run()
 
     def _build_menu(self) -> pystray.Menu:
@@ -49,14 +53,19 @@ class BakRestTrayApp:
         return f"Server: {server} | File in attesa: {pending}"
 
     def _read_server_status(self) -> str:
+        status = self._read_server_status_data()
+        if status is None:
+            return "sconosciuto"
+        return "raggiungibile" if status.get("reachable") else "non raggiungibile"
+
+    def _read_server_status_data(self) -> dict[str, object] | None:
         path = self.config.storage.status_file
         if not path.exists():
-            return "sconosciuto"
+            return None
         try:
-            data = json.loads(path.read_text(encoding="utf-8"))
+            return json.loads(path.read_text(encoding="utf-8"))
         except (OSError, json.JSONDecodeError):
-            return "errore stato"
-        return "raggiungibile" if data.get("reachable") else "non raggiungibile"
+            return None
 
     def _backup_and_shutdown(self, icon: pystray.Icon, item: pystray.MenuItem) -> None:
         threading.Thread(target=self._backup_and_shutdown_worker, daemon=True).start()
@@ -81,8 +90,29 @@ class BakRestTrayApp:
 
     def _quit(self, icon: pystray.Icon, item: pystray.MenuItem) -> None:
         self.logger.info("BakRestTray stopped")
+        self.stop_event.set()
         self.icon.stop()
 
+    def _server_status_monitor(self) -> None:
+        interval = min(max(self.config.backup.server_check.interval_seconds, 60), 600)
+        while not self.stop_event.wait(interval):
+            status = self._read_server_status_data()
+            if status is None:
+                continue
+
+            reachable = bool(status.get("reachable"))
+            if reachable:
+                self.last_alert_reachable = True
+                continue
+
+            if self.last_alert_reachable is not False:
+                self.last_alert_reachable = False
+                self.logger.warning("Showing backup server unreachable alert")
+                _show_error_message(
+                    "Bak&Rest",
+                    "Accendi il server di backup o verifica che sia connesso alla rete",
+                )
+
 
 def _create_icon_image() -> Image.Image:
     image = Image.new("RGBA", (64, 64), (26, 38, 52, 255))