GCal Mapping: Management commands and signals

eventplanner_gcal/management/commands/events_gcal_sync.py

@@ -1,10 +0,0 @@
-from django.core.management.base import BaseCommand
-
-from eventplanner_gcal.models import syncGCalEvents
-
-class Command(BaseCommand):
-    help = 'Synchronize Google Calendar with locally stored Events'
-
-    def handle(self, **options):
-         print ( "Running Sync")
-         syncGCalEvents()

eventplanner_gcal/management/commands/gcal_delete_all.py

@@ -0,0 +1,9 @@
+from django.core.management.base import NoArgsCommand
+from eventplanner_gcal.models import deleteAllGCalEvents
+
+class Command(NoArgsCommand):
+    help = 'Delete all events in the google calendar created by this app'
+    def handle_noargs(self, **options):
+        print ("Deleting all GCal Events.")
+        nrOfDeletedEvents = deleteAllGCalEvents()
+        print ("Deleted %d events. To Restore them from local database run gcal_sync" % (nrOfDeletedEvents, ) )

eventplanner_gcal/management/commands/gcal_sync.py

@@ -0,0 +1,10 @@
+from django.core.management.base import NoArgsCommand
+
+from eventplanner_gcal.models import syncGCalEvents
+
+class Command(NoArgsCommand):
+    help = 'Synchronize Google Calendar with locally stored Events'
+    def handle_noargs(self, **options):
+         print ( "Running Sync")
+         created, deleted = syncGCalEvents()
+         print ( "Created %d  and deleted %d events"  % (created,deleted) )

eventplanner_gcal/models.py

@@ -65,7 +65,7 @@ def createAttendeesObj( event ):
     return result
 
 
-def createEvent( event, timezone="Europe/Berlin" ):
+def buildGCalEvent( event, timezone="Europe/Berlin" ):
     if service is None:
         logger.error("createEvent: Google API connection not configured")
         return
@@ -89,7 +89,7 @@ def createEvent( event, timezone="Europe/Berlin" ):
     else:
         endTime = datetime.time( 22, 30 )
 
-    googleEvent = {
+    return {
         'summary':     unicode(settings.GCAL_COUPLING['eventPrefix'] + event.title),
         'description': unicode(event.desc),
         'location':    unicode(event.location),
@@ -103,10 +103,10 @@ def createEvent( event, timezone="Europe/Berlin" ):
         },
         'attendees': createAttendeesObj( event ),
     }
-    return service.events().insert(calendarId='primary', body=googleEvent)
 
+# -------------------------------------------------------------------------------
 
-def getAllEvents(pageToken=None):
+def getAllGCalEvents(pageToken=None):
     events = service.events().list(
         calendarId='primary',
         singleEvents=True,
@@ -120,15 +120,43 @@ def getAllEvents(pageToken=None):
     return events['items']
 
 
-def onGcalEventCreated( request_id, response, exception ):
-    if exception is not None:
-        print ( "response " + str( response ) )
-        raise exception
+def createGCalEvent( event, timezone="Europe/Berlin" ):
+    googleEvent = buildGCalEvent(event,timezone)
+    return service.events().insert(calendarId='primary', body=googleEvent)
+
+def updateGCalEvent( event, timezone="Europe/Berlin"):
+    googleEvent = buildGCalEvent(event,timezone)
+    mapping = GCalMapping.objects.get( event=event )
+    gcalId = mapping.gcal_id
+    return service.events().patch(calendarId='primary', eventId= gcalId, body=googleEvent)
+
+def deleteGCalEvent( event ):
+    mapping = GCalMapping.objects.get( event=event )
+    gcalId = mapping.gcal_id
+    return service.events().delete(calendarId='primary', eventId=gcalId)
+
+
+
+# -------------------------------------------------------------------------------
+
+def deleteAllGCalEvents():
+    if service is None:
+        logger.error("deleteAllGCalEvents: Google API connection not configured")
+        return
+
+    gcalIds = [ ev['id'] for ev in getAllGCalEvents() ]
+    l = len(gcalIds)
+    if l == 0:
+        return l
+
+    batch = BatchHttpRequest()
+    for id in gcalIds:
+        batch.add( service.events().delete(calendarId='primary', eventId=id) )
+    batch.execute()
+
+    return l
+
 
-    googleId = response['id']
-    djangoId = response['extendedProperties']['private']['blechreizID']
-    mapping = GCalMapping( gcal_id = googleId, event = Event.objects.get( pk=djangoId ) )
-    mapping.save()
 
 
 def syncGCalEvents():
@@ -136,7 +164,7 @@ def syncGCalEvents():
         logger.error("syncGCalEvents: Google API connection not configured")
         return
 
-    allEvents = getAllEvents()
+    allEvents = getAllGCalEvents()
 
     eventsAtGoogle_djangoID = set()
     eventsAtGoogle_googleID = set()
@@ -151,11 +179,23 @@ def syncGCalEvents():
     eventsToDelete_googleID = eventsAtGoogle_googleID - localEvents_googleID
 
 
+    def onGcalEventCreated( request_id, response, exception ):
+        """Callback function for created events"""
+        if exception is not None:
+            print ( "response " + str( response ) )
+            raise exception
+
+        googleId = response['id']
+        djangoId = response['extendedProperties']['private']['blechreizID']
+        mapping = GCalMapping( gcal_id = googleId, event = Event.objects.get( pk=djangoId ) )
+        mapping.save()
+
+
     batch = BatchHttpRequest()
 
     batchIsEmpty = True
     for eventDjangoID in eventsToCreate_djangoID:
-        batch.add( createEvent( Event.objects.get( pk=eventDjangoID ) ), callback=onGcalEventCreated )
+        batch.add( createGCalEvent( Event.objects.get( pk=eventDjangoID ) ), callback=onGcalEventCreated )
         batchIsEmpty=False
 
     for eventGoogleID in eventsToDelete_googleID:
@@ -165,7 +205,6 @@ def syncGCalEvents():
     if not batchIsEmpty:
         batch.execute()
 
-
-
+    return len (eventsToCreate_djangoID), len(eventsToDelete_googleID )
 
 

eventplanner_gcal/signals.py

@@ -0,0 +1,27 @@
+from django.db.models.signals import post_save,pre_delete
+from django.dispatch import receiver
+from eventplanner.models import Event, EventParticipation
+
+from eventplanner_gcal.models import createGCalEvent, updateGCalEvent, deleteGCalEvent
+
+@receiver( post_save,sender= Event)
+def event_post_save_handler(event, **kwargs):
+    created = kwargs['created']
+    if created:
+        createGCalEvent( event ).execute()
+    else:
+        updateGCalEvent( event ).execute()
+
+
+@receiver( pre_delete,sender= Event)
+def event_pre_delete_handler(event, **kwargs):
+    deleteGCalEvent( event ).execute()
+
+
+
+@receiver( post_save, sender=EventParticipation )
+def participation_post_save_handler(participation, **kwargs):
+    updateGCalEvent( participation.event ).execute()
+
+
+