Do not notify warning/errors from same source twice

Closes #1842

SABnzbd.py

@@ -136,16 +136,29 @@ class GUIHandler(logging.Handler):
         except TypeError:
             parsed_msg = record.msg + str(record.args)
 
-        if record.levelno == logging.WARNING:
-            sabnzbd.notifier.send_notification(T("Warning"), parsed_msg, "warning")
-        else:
-            sabnzbd.notifier.send_notification(T("Error"), parsed_msg, "error")
+        warning = {
+            "type": record.levelname,
+            "text": parsed_msg,
+            "time": int(time.time()),
+            "origin": "%s%d" % (record.filename, record.lineno),
+        }
 
         # Append traceback, if available
-        warning = {"type": record.levelname, "text": parsed_msg, "time": int(time.time())}
         if record.exc_info:
             warning["text"] = "%s\n%s" % (warning["text"], traceback.format_exc())
 
+        # Do not notify the same notification within 1 minute from the same source
+        # This prevents endless looping if the notification service itself throws an error/warning
+        # We don't check based on message content, because if it includes a timestamp it's not unique
+        if not any(
+            stored_warning["origin"] == warning["origin"] and stored_warning["time"] + DEF_TIMEOUT > time.time()
+            for stored_warning in self.store
+        ):
+            if record.levelno == logging.WARNING:
+                sabnzbd.notifier.send_notification(T("Warning"), parsed_msg, "warning")
+            else:
+                sabnzbd.notifier.send_notification(T("Error"), parsed_msg, "error")
+
         # Loose the oldest record
         if len(self.store) >= self._size:
             self.store.pop(0)