def get_policy_rule(self,
context,
rule_cls,
rule_id,
policy_id,
fields=None):
"""Get a QoS policy rule.
:param context: neutron api request context
:type context: neutron.context.Context
:param rule_cls: the rule object class
:type rule_cls: a class from the rule_object (qos.objects.rule) module
:param rule_id: the id of the QoS policy rule to get
:type rule_id: str uuid
:param policy_id: the id of the rule's policy
:type policy_id: str uuid
:returns: a QoS policy rule object
:raises: n_exc.QosRuleNotFound
"""
with db_api.autonested_transaction(context.session):
# Ensure we have access to the policy.
self._get_policy_obj(context, policy_id)
rule = rule_cls.get_object(context, id=rule_id)
if not rule:
raise n_exc.QosRuleNotFound(policy_id=policy_id, rule_id=rule_id)
return rule
def get_rule_by_id(self, rule_id):
"""Return rule specified by rule_id.
@raise QosRuleNotFound: if there is no such rule in the policy.
"""
for rule in self.rules:
if rule_id == rule.id:
return rule
raise exceptions.QosRuleNotFound(policy_id=self.id, rule_id=rule_id)
def get_policy_bandwidth_limit_rule(self, context, rule_id,
policy_id, fields=None):
# make sure we have access to the policy when fetching the rule
with db_api.autonested_transaction(context.session):
# first, validate that we have access to the policy
self._get_policy_obj(context, policy_id)
rule = rule_object.QosBandwidthLimitRule.get_by_id(
context, rule_id)
if not rule:
raise n_exc.QosRuleNotFound(policy_id=policy_id, rule_id=rule_id)
return rule
