+import datetime
import os
+import sys
from django.db import models
from django.forms.models import model_to_dict
-from openstack.event_manager import EventSender
+from django.core.urlresolvers import reverse
+from django.forms.models import model_to_dict
+try:
+ # This is a no-op if observer_disabled is set to 1 in the config file
+ from observer import *
+except:
+ print >> sys.stderr, "import of observer failed! printing traceback and disabling observer:"
+ import traceback
+ traceback.print_exc()
-class PlCoreBase(models.Model):
+ # guard against something failing
+ def notify_observer(*args, **kwargs):
+ pass
+
+# This manager will be inherited by all subclasses because
+# the core model is abstract.
+class PlCoreBaseManager(models.Manager):
+ def get_query_set(self):
+ return super(PlCoreBaseManager, self).get_query_set().filter(deleted=False)
- created = models.DateTimeField(auto_now_add=True)
- updated = models.DateTimeField(auto_now=True)
+ # default values for created and updated are only there to keep evolution
+ # from failing.
+class PlCoreBase(models.Model):
+ objects = PlCoreBaseManager()
+ created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
+ updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
enacted = models.DateTimeField(null=True, default=None)
+ backend_status = models.CharField(max_length=140,
+ default="Provisioning in progress")
+ deleted = models.BooleanField(default=False)
class Meta:
+ # Changing abstract to False would require the managers of subclasses of
+ # PlCoreBase to be customized individually.
abstract = True
app_label = "core"
def get_field_diff(self, field_name):
return self.diff.get(field_name, None)
+ def can_update(self, user):
+ if user.is_readonly:
+ return False
+ if user.is_admin:
+ return True
+ return False
+
+ def delete(self, *args, **kwds):
+ # so we have something to give the observer
+ pk = self.pk
+ model_dict = model_to_dict(self)
+ for (k,v) in model_dict.items():
+ # things like datetime are not JSON serializable
+ model_dict[k] = str(v)
+
+ super(PlCoreBase, self).delete(*args, **kwds)
+
+ # This is a no-op if observer_disabled is set
+ notify_observer(model=self, delete=True, pk=pk, model_dict=model_dict)
+
def save(self, *args, **kwargs):
super(PlCoreBase, self).save(*args, **kwargs)
- # Tell the observer that the source database has been updated
- EventSender().fire()
+ # This is a no-op if observer_disabled is set
+ notify_observer()
self.__initial = self._dict
+ def save_by_user(self, user, *args, **kwds):
+ if self.can_update(user):
+ self.save(*args, **kwds)
+
+ def delete_by_user(self, user, *args, **kwds):
+ if self.can_update(user):
+ self.delete(*args, **kwds)
+
@property
def _dict(self):
return model_to_dict(self, fields=[field.name for field in