Added resource deletion upon stack deletion

Only implemented for ASGs and LCs since they're all we cared about for
our particular problem. It should be easy to follow this pattern for
other resource types, though.

Signed-off-by: Scott Greene <scott.greene@getbraintree.com>

moto/autoscaling/models.py

@@ -80,6 +80,10 @@ class FakeLaunchConfiguration(object):
         )
         return config
 
+    def delete(self, region_name):
+        backend = autoscaling_backends[region_name]
+        backend.delete_launch_configuration(self.name)
+
     @property
     def physical_resource_id(self):
         return self.name
@@ -167,6 +171,10 @@ class FakeAutoScalingGroup(object):
         )
         return group
 
+    def delete(self, region_name):
+        backend = autoscaling_backends[region_name]
+        backend.delete_autoscaling_group(self.name)
+
     @property
     def physical_resource_id(self):
         return self.name

moto/cloudformation/models.py

@@ -52,6 +52,10 @@ class FakeStack(object):
         self.resource_map.update(json.loads(template))
         self.output_map = self._create_output_map()
 
+    def delete(self):
+        self.resource_map.delete()
+        self.status = 'DELETE_COMPLETE'
+
 
 class CloudFormationBackend(BaseBackend):
 
@@ -112,13 +116,14 @@ class CloudFormationBackend(BaseBackend):
         if name_or_stack_id in self.stacks:
             # Delete by stack id
             stack = self.stacks.pop(name_or_stack_id, None)
-            stack.status = 'DELETE_COMPLETE'
+            stack.delete()
             self.deleted_stacks[stack.stack_id] = stack
             return self.stacks.pop(name_or_stack_id, None)
         else:
             # Delete by stack name
-            stack_to_delete = [stack for stack in self.stacks.values() if stack.name == name_or_stack_id][0]
-            self.delete_stack(stack_to_delete.stack_id)
+            for stack in list(self.stacks.values()):
+                if stack.name == name_or_stack_id:
+                    self.delete_stack(stack.stack_id)
 
 
 cloudformation_backends = {}

moto/cloudformation/parsing.py

@@ -374,6 +374,11 @@ class ResourceMap(collections.Mapping):
                 changed_resource = parse_and_update_resource(resource_name, resource_json, self, self._region_name)
                 self._parsed_resources[resource_name] = changed_resource
 
+    def delete(self):
+        for resource in self.resources:
+            parsed_resource = self._parsed_resources.pop(resource)
+            parsed_resource.delete(self._region_name)
+
 
 class OutputMap(collections.Mapping):
     def __init__(self, resources, template):