def dependencies(self, stack):
"""Return the Resource objects in given stack on which this depends."""
def path(section):
return '.'.join([self.name, section])
def get_resource(res_name):
if res_name not in stack:
raise exception.InvalidTemplateReference(resource=res_name,
key=self.name)
return stack[res_name]
def strict_func_deps(data, datapath):
return six.moves.filter(
lambda r: getattr(r, 'strict_dependency', True),
function.dependencies(data, datapath))
explicit_depends = [] if self._depends is None else self._depends
prop_deps = strict_func_deps(self._properties, path('Properties'))
metadata_deps = strict_func_deps(self._metadata, path('Metadata'))
# (ricolin) External resource should not depend on any other resources.
# This operation is not allowed for now.
if self.external_id():
if explicit_depends:
raise exception.InvalidExternalResourceDependency(
external_id=self.external_id(),
resource_type=self.resource_type
)
return itertools.chain()
return itertools.chain((get_resource(dep) for dep in explicit_depends),
prop_deps, metadata_deps)
def required_resource_names(self):
"""Return a set of names of all resources on which this depends.
Note that this is done entirely in isolation from the rest of the
template, so the resource names returned may refer to resources that
don't actually exist, or would have strict_dependency=False. Use the
dependencies() method to get validated dependencies.
"""
if self._dep_names is None:
explicit_depends = [] if self._depends is None else self._depends
def path(section):
return '.'.join([self.name, section])
prop_deps = function.dependencies(self._properties,
path(PROPERTIES))
metadata_deps = function.dependencies(self._metadata,
path(METADATA))
implicit_depends = six.moves.map(lambda rp: rp.name,
itertools.chain(prop_deps,
metadata_deps))
# (ricolin) External resource should not depend on any other
# resources. This operation is not allowed for now.
if self.external_id():
if explicit_depends:
raise exception.InvalidExternalResourceDependency(
external_id=self.external_id(),
resource_type=self.resource_type
)
self._dep_names = set()
else:
self._dep_names = set(itertools.chain(explicit_depends,
implicit_depends))
return self._dep_names