removed endless recursion when database is empty and connection to pv cannot be established

aura.py

@@ -43,9 +43,6 @@ class Aura(AuraCommon):
 
         signal.signal(signal.SIGUSR1, receive_signal)
 
-        # addition initialization
-        self.scheduler.fetch_new_programme()
-
     def join_comm(self):
         # start listener thread
         self.messenger.start()

modules/scheduling/scheduler.py

@@ -76,6 +76,7 @@ class AuraScheduler(ExceptionLogger, threading.Thread):
     active_entry = None
     logger = None
     config = None
+    tried_fetching = 0
 
     def __init__(self, config):
         """
@@ -333,6 +334,13 @@ class AuraScheduler(ExceptionLogger, threading.Thread):
 
     # ------------------------------------------------------------------------------------------ #
     def fetch_new_programme(self):
+        if self.tried_fetching == 5:
+            self.logger.error("Cannot connect to PV! No Programme loaded!")
+            self.tried_fetching = 0
+            return ""
+
+        self.tried_fetching += 1
+
         acs = AuraCalendarService(self.config)
         queue = acs.get_queue()
 
@@ -344,6 +352,9 @@ class AuraScheduler(ExceptionLogger, threading.Thread):
 
         if response == "fetching_finished":
             self.load_programme_from_db()
+            if self.programme is not None and len(self.programme) > 0:
+                self.tried_fetching = 0
+
             return self.get_act_programme_as_string()
         else:
             self.logger.warning("Got an unknown response from AuraCalendarService: " + response)