Superevents

Adding superevents to GraceDB, including the necessary models, utility functions, and API resources. This has also resulted in changes to the overall configuration and some parts of the events model.

Many models in the events app, like Labels, Tags, EventLogs, etc. were needed in a similar form for superevents. We were able to completely reuse the existing Label and Tag models for superevents. In other cases, we had to abstract the main functionality of the class into an abstract base class and then implement separate models for events and superevents, due to foreign key requirements. This should leave the current functionality of the events models unchanged.

Some portions of the events API have been modified because of one of the following reasons:

• It didn't make sense and was unnecessarily difficult to duplicate for superevents
• It was inefficient or bad

These changes are documented here: https://bugs.ligo.org/redmine/issues/6133

gracedb/superevents/models.py

 from django.db import models, IntegrityError
 from django.urls import reverse
 from django.contrib.auth import get_user_model
+from django.contrib.contenttypes.models import ContentType
 from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.utils.translation import ugettext_lazy as _
@@ -12,14 +13,14 @@ from core.time_utils import posixToGpsTime, gpsToUtc
 from core.utils import int_to_letters, letters_to_int
 from events.models import Event, SignoffBase, VOEventBase, EMObservationBase, \
     EMFootprintBase
-from core.utils import int_to_letters
+from guardian.models import GroupObjectPermission
 
 import datetime
 from cStringIO import StringIO
 from hashlib import sha1
 import os
 import re
-
+import shutil
 import logging
 
 # Other setup
@@ -149,6 +150,21 @@ class Superevent(CleanSaveModel, ModelToDictMixin, AutoIncrementModel):
             self.preferred_event not in self.events.all()):
             self.events.add(self.preferred_event)
 
+    def delete(self, purge=False, *args, **kwargs):
+        if purge:
+            # Delete data directory
+            if os.path.isdir(self.datadir):
+                shutil.rmtree(self.datadir)
+
+            # Delete GroupObjectPermissions
+            ctype = ContentType.objects.get_for_model(self.__class__)
+            gops = GroupObjectPermission.objects.filter(object_pk=self.pk,
+                content_type=ctype)
+            gops.delete()
+
+        # Call base class delete
+        super(Superevent, self).delete(*args, **kwargs)
+
     def confirm_as_gw(self):
         """
         Sets is_gw to True, calculates the gw_date_number in the database, and