switch from naive timestamps to timezone-aware timestamps

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

diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index c6fc5be..d461c9d 100644 (file)
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -1,15 +1,17 @@
-import datetime
 import os
+import sys
 from django.db import models
 from django.forms.models import model_to_dict
 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 "import of observer failed! printing traceback and disabling observer:"
+    print >> sys.stderr, "import of observer failed! printing traceback and disabling observer:"
     import traceback
     traceback.print_exc()
 
@@ -17,16 +19,50 @@ except:
     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()
 
     # default values for created and updated are only there to keep evolution
     # from failing.
-
-    created = models.DateTimeField(auto_now_add=True, default=datetime.datetime.now())
-    updated = models.DateTimeField(auto_now=True, default=datetime.datetime.now())
+    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"
 
@@ -61,20 +97,24 @@ class PlCoreBase(models.Model):
 
     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)
+        purge = kwds.get('purge',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'])
 
-        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)
-        
+
         # This is a no-op if observer_disabled is set
         notify_observer()