def _get_quotas(self, context, resources, keys, has_sync):
"""
A helper method which retrieves the quotas for the specific
resources identified by keys, and which apply to the current
context.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resources.
:param keys: A list of the desired quotas to retrieve.
:param has_sync: If True, indicates that the resource must
have a sync attribute; if False, indicates
that the resource must NOT have a sync
attribute.
"""
# Filter resources
if has_sync:
sync_filt = lambda x: hasattr(x, 'sync')
else:
sync_filt = lambda x: not hasattr(x, 'sync')
desired = set(keys)
sub_resources = dict((k, v) for k, v in resources.items()
if k in desired and sync_filt(v))
# Make sure we accounted for all of them...
if len(keys) != len(sub_resources):
unknown = desired - set(sub_resources.keys())
raise exception.QuotaResourceUnknown(unknown=sorted(unknown))
# Grab and return the quotas (without usages)
quotas = self.get_project_quotas(context, sub_resources,
context.project_id,
context.quota_class, usages=False)
return dict((k, v['limit']) for k, v in quotas.items())
def count(self, context, resource, *args, **kwargs):
"""Count a resource.
For countable resources, invokes the count() function and
returns its result. Arguments following the context and
resource are passed directly to the count function declared by
the resource.
:param context: The request context, for access checks.
:param resource: The name of the resource, as a string.
"""
# Get the resource
res = self._resources.get(resource)
if not res or not hasattr(res, 'count'):
raise exception.QuotaResourceUnknown(unknown=[resource])
return res.count(context, *args, **kwargs)
