heat engine : store stack on failed update

Store the stack even when the update fails, otherwise we
lose track of the resources which failed on create so they
are not removed on stack delete

fixes bug 1151989

Change-Id: Ic8aa5ef92e188fb704ed25563aa9b86aa69232b4

heat/engine/parser.py

@@ -426,13 +426,6 @@ def update(self, newstack, action=UPDATE):
                             raise exception.ResourceUpdateFailed(
                                 resource_name=res.name)
 
-                # flip the template & parameters to the newstack values
-                self.t = newstack.t
-                self.parameters = newstack.parameters
-                template_outputs = self.t[template.OUTPUTS]
-                self.outputs = self.resolve_static_data(template_outputs)
-                self.store()
-
                 if action == self.UPDATE:
                     stack_status = self.UPDATE_COMPLETE
                     reason = 'Stack successfully updated'
@@ -469,6 +462,16 @@ def update(self, newstack, action=UPDATE):
 
             self.state_set(stack_status, reason)
 
+            # flip the template & parameters to the newstack values
+            # Note we do this on success and failure, so the current
+            # stack resources are stored, even if one is in a failed
+            # state (otherwise we won't remove them on delete)
+            self.t = newstack.t
+            self.parameters = newstack.parameters
+            template_outputs = self.t[template.OUTPUTS]
+            self.outputs = self.resolve_static_data(template_outputs)
+            self.store()
+
     def delete(self, action=DELETE):
         '''
         Delete all of the resources, and then the stack itself.

heat/tests/test_parser.py

@@ -674,6 +674,37 @@ def test_update_modify_replace_failed_create(self):
         self.assertEqual(self.stack.state, parser.Stack.UPDATE_FAILED)
         self.m.VerifyAll()
 
+    @stack_delete_after
+    def test_update_add_failed_create(self):
+        tmpl = {'Resources': {'AResource': {'Type': 'GenericResourceType'}}}
+
+        self.stack = parser.Stack(self.ctx, 'update_test_stack',
+                                  template.Template(tmpl))
+        self.stack.store()
+        self.stack.create()
+        self.assertEqual(self.stack.state, parser.Stack.CREATE_COMPLETE)
+
+        tmpl2 = {'Resources': {
+                 'AResource': {'Type': 'GenericResourceType'},
+                 'BResource': {'Type': 'GenericResourceType'}}}
+        updated_stack = parser.Stack(self.ctx, 'updated_stack',
+                                     template.Template(tmpl2))
+
+        # patch in a dummy handle_create making BResource fail creating
+        self.m.StubOutWithMock(generic_rsrc.GenericResource, 'handle_create')
+        generic_rsrc.GenericResource.handle_create().AndRaise(Exception)
+        self.m.ReplayAll()
+
+        self.stack.update(updated_stack)
+        self.assertEqual(self.stack.state, parser.Stack.UPDATE_FAILED)
+        self.assertTrue('BResource' in self.stack)
+
+        # Reload the stack from the DB and prove that it contains the failed
+        # resource (to ensure it will be deleted on stack delete)
+        re_stack = parser.Stack.load(self.ctx, stack_id=self.stack.id)
+        self.assertTrue('BResource' in re_stack)
+        self.m.VerifyAll()
+
     @stack_delete_after
     def test_update_rollback(self):
         # patch in a dummy property schema for GenericResource