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# Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# Author: Kiall Mac Innes <kiall@hpe.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import abc
from oslo_config import cfg
from designate import exceptions
from designate.plugin import DriverPlugin
class Quota(DriverPlugin, metaclass=abc.ABCMeta):
"""Base class for quota plugins"""
__plugin_ns__ = 'designate.quota'
__plugin_type__ = 'quota'
def limit_check(self, context, tenant_id, **values):
resources_exceeded = []
quotas = self.get_quotas(context, tenant_id)
for resource, value in values.items():
if resource in quotas:
# Setting the resource quota to a negative value will make
# the resource unlimited
if quotas[resource] >= 0 and value > quotas[resource]:
resources_exceeded.append(resource)
else:
raise exceptions.QuotaResourceUnknown(
"'%s' is not a valid quota resource." % resource
)
if resources_exceeded:
resources_exceeded.sort(key=len)
raise exceptions.OverQuota(
'Quota exceeded for %s.' %
', '.join(resources_exceeded)
)
def get_quotas(self, context, tenant_id):
quotas = self.get_default_quotas(context)
quotas.update(self._get_quotas(context, tenant_id))
return quotas
@abc.abstractmethod
def _get_quotas(self, context, tenant_id):
pass
def get_default_quotas(self, context):
return {
'zones': cfg.CONF.quota_zones,
'zone_recordsets': cfg.CONF.quota_zone_recordsets,
'zone_records': cfg.CONF.quota_zone_records,
'recordset_records': cfg.CONF.quota_recordset_records,
'api_export_size': cfg.CONF.quota_api_export_size,
}
def get_quota(self, context, tenant_id, resource):
quotas = self._get_quotas(context, tenant_id)
if resource not in quotas:
raise exceptions.QuotaResourceUnknown("%s is not a valid quota "
"resource", resource)
return quotas[resource]
def set_quota(self, context, tenant_id, resource, hard_limit):
raise NotImplementedError()
def reset_quotas(self, context, tenant_id):
raise NotImplementedError()
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