Don't load non-referenced resources from DB

During a convergence check operation, we should never load resources from
the database. However, all resources will inevitably be created whenever we
do stack[some_resource]. Previously, resources not represented in the
cached data (i.e. the ones we were least interested in) would get loaded
from the database when this occurred.

This change ensures that only the resource being checked is loaded from the
database, as intended, and adds asserts to prevent any future regression
occurring silently.

Change-Id: I9e568640d776748a1c9f2950f8bb0a8cea325996
Closes-Bug: #1656429
changes/71/420971/1
Zane Bitter 6 years ago
parent af46280c8a
commit 4507322675
  1. 4
      heat/engine/resource.py
  2. 5
      heat/engine/stack.py

@ -260,11 +260,11 @@ class Resource(object):
self.current_template_id = None
self.root_stack_id = None
if not stack.has_cache_data(name):
if stack.cache_data is None:
resource = stack.db_resource_get(name)
if resource:
self._load_data(resource)
else:
elif stack.has_cache_data(name):
self.action = stack.cache_data[name]['action']
self.status = stack.cache_data[name]['status']
self.id = stack.cache_data[name]['id']

@ -315,6 +315,8 @@ class Stack(collections.Mapping):
def _find_filtered_resources(self, filters=None):
rsrc_def_cache = {self.t.id: self.t.resource_definitions(self)}
if filters:
assert self.cache_data is None, \
"Resources should not be loaded from the DB"
resources = resource_objects.Resource.get_all_by_stack(
self.context, self.id, filters)
else:
@ -354,6 +356,8 @@ class Stack(collections.Mapping):
def _db_resources_get(self):
if self._db_resources is None:
assert self.cache_data is None, \
"Resources should not be loaded from the DB"
_db_resources = resource_objects.Resource.get_all_by_stack(
self.context, self.id)
if not _db_resources:
@ -1219,6 +1223,7 @@ class Stack(collections.Mapping):
self.t = template
self.reset_dependencies()
self._resources = None
self.cache_data = None
if action is not self.CREATE:
self.updated_time = oslo_timeutils.utcnow()

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