def limit_check(self, context, tenant_id, resources, values):
"""Check simple quota limits.
For limits--those quotas for which there is no usage
synchronization function--this method checks that a set of
proposed values are permitted by the limit restriction.
If any of the proposed values is over the defined quota, an
OverQuota exception will be raised with the sorted list of the
resources which are too high. Otherwise, the method returns
nothing.
:param context: The request context, for access checks.
:param tenant_id: The tenant_id to check the quota.
:param resources: A dictionary of the registered resources.
:param values: A dictionary of the values to check against the
quota.
"""
# Ensure no value is less than zero
unders = [key for key, val in values.items() if val < 0]
if unders:
raise exceptions.InvalidQuotaValue(unders=sorted(unders))
# Get the applicable quotas
quotas = self._get_quotas(context, tenant_id, resources)
# Check the quotas and construct a list of the resources that
# would be put over limit by the desired values
overs = [
key for key, val in values.items()
if quotas[key] >= 0 and quotas[key] < val
]
if overs:
raise exceptions.OverQuota(overs=sorted(overs))
def make_reservation(self, context, tenant_id, deltas, plugin):
# Verify that resources are managed by the quota engine
# Ensure no value is less than zero
unders = [key for key, val in deltas.items() if val < 0]
if unders:
raise exceptions.InvalidQuotaValue(unders=sorted(unders))
requested_resources = set(deltas.keys())
all_resources = resource_registry.get_all_resources()
managed_resources = set([res for res in all_resources.keys()
if res in requested_resources])
# Make sure we accounted for all of them...
unknown_resources = requested_resources - managed_resources
if unknown_resources:
raise exceptions.QuotaResourceUnknown(
unknown=sorted(unknown_resources))
# FIXME(salv-orlando): There should be no reason for sending all the
# resource in the registry to the quota driver, but as other driver
# APIs request them, this will be sorted out with a different patch.
return self.get_driver().make_reservation(
context,
tenant_id,
all_resources,
deltas,
plugin)