add silent kwarg to delete() and save()

[plstackapi.git] / planetstack / core / models / plcorebase.py

diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index 08e4047..4263f94 100644 (file)
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -1,16 +1,68 @@
 import os
+import sys
 from django.db import models
 from django.forms.models import model_to_dict
-from observer.event_manager import EventSender
-
+from django.core.urlresolvers import reverse
+from django.forms.models import model_to_dict
+from django.utils import timezone
+import model_policy
+
+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()
+
+    # 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 PlCoreBaseDeletionManager(models.Manager):
+    def get_queryset(self):
+        parent=super(PlCoreBaseDeletionManager, self)
+        if hasattr(parent, "get_queryset"):
+            return parent.get_queryset().filter(deleted=True)
+        else:
+            return parent.get_query_set().filter(deleted=True)
+
+    # deprecated in django 1.7 in favor of get_queryset().
+    def get_query_set(self):
+        return self.get_queryset()
+
+# This manager will be inherited by all subclasses because
+# the core model is abstract.
+class PlCoreBaseManager(models.Manager):
+    def get_queryset(self):
+        parent=super(PlCoreBaseManager, self)
+        if hasattr(parent, "get_queryset"):
+            return parent.get_queryset().filter(deleted=False)
+        else:
+            return parent.get_query_set().filter(deleted=False)
+
+    # deprecated in django 1.7 in favor of get_queryset().
+    def get_query_set(self):
+        return self.get_queryset()
 
 class PlCoreBase(models.Model):
+    objects = PlCoreBaseManager()
+    deleted_objects = PlCoreBaseDeletionManager()
 
-    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.
+    created = models.DateTimeField(auto_now_add=True, default=timezone.now)
+    updated = models.DateTimeField(auto_now=True, default=timezone.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"
 
@@ -36,19 +88,52 @@ class PlCoreBase(models.Model):
     def get_field_diff(self, field_name):
         return self.diff.get(field_name, None)
 
-    def delete(self, *args, **kwds):
-        super(PlCoreBase, self).delete(*args, **kwds)
+    def can_update(self, user):
+        if user.is_readonly:
+            return False
+        if user.is_admin:
+            return True
+        return False
 
-        EventSender().fire({'delete_flag':True,'model':self.__name__})
+    def delete(self, *args, **kwds):
+        # so we have something to give the observer
+        purge = kwds.get('purge',False)
+        silent = kwds.get('silent',False)
+        try:
+            purge = purge or observer_disabled
+        except NameError:
+            pass
+
+        if (purge):
+            del kwds['purge']
+            super(PlCoreBase, self).delete(*args, **kwds)
+        else:
+            self.deleted = True
+            self.enacted=None
+            self.save(update_fields=['enacted','deleted'], silent=silent)
 
     def save(self, *args, **kwargs):
+        if "silent" in kwargs:
+            silent=kwargs.pop("silent")
+        else:
+            silent=False
+
         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
+        if not silent:
+            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