Initial Position after Restart

This patch ensures that the calendar data is updated at least once
before repositioning the camera. This ensures that active recordings are
no longer interrupted by moving the camera to the neutral position on
(re-)start.

This fixes #63

occameracontrol/agent.py

@@ -60,6 +60,7 @@ class Agent:
     '''
     agent_id: str
     events: list[Event] = []
+    calendar_initialized: bool = False
 
     def __init__(self, agent_id: str):
         self.agent_id = agent_id
@@ -108,6 +109,7 @@ def update_calendar(self):
 
         self.events = self.parse_calendar(calendar)
         register_calendar_update(self.agent_id)
+        self.calendar_initialized = True
 
     def active_events(self):
         '''Return a list of active events

occameracontrol/camera.py

@@ -104,9 +104,14 @@ def update_position(self):
         necessary.
         '''
         agent_id = self.agent.agent_id
+        level = logging.DEBUG if int(time.time()) % 60 else logging.INFO
+
+        while not self.agent.calendar_initialized:
+            logger.log(level, '[%s] Calendar not yet initialized…', agent_id)
+            time.sleep(1)
+
         event = self.agent.next_event()
 
-        level = logging.DEBUG if int(time.time()) % 60 else logging.INFO
         if event.future():
             logger.log(level, '[%s] Next event `%s` starts in %i seconds',
                        agent_id, event.title[:40], event.start - time.time())