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OpenStack Study: quota_db.py**** CubicPower OpenStack Study ****
# vim: tabstop=4 shiftwidth=4 softtabstop=4 # Copyright 2011 OpenStack Foundation. # All Rights Reserved. # # 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 sqlalchemy as sa from neutron.common import exceptions from neutron.db import model_base from neutron.db import models_v2
**** CubicPower OpenStack Study **** class Quota(model_base.BASEV2, models_v2.HasId): """Represent a single quota override for a tenant. If there is no row for a given tenant id and resource, then the
**** CubicPower OpenStack Study **** class DbQuotaDriver(object): """Driver to perform necessary checks to enforce quotas and obtain quota information. The
**** CubicPower OpenStack Study **** def get_tenant_quotas(context, resources, tenant_id): """Given a list of resources, retrieve the quotas for the given tenant. :param context: The request context, for access checks. :param resources: A dictionary of the registered resource keys. :param tenant_id: The ID of the tenant to return quotas for. :return dict: from resource name to dict of name and limit """ # init with defaults tenant_quota = dict((key, resource.default) for key, resource in resources.items()) # update with tenant specific limits q_qry = context.session.query(Quota).filter_by(tenant_id=tenant_id) tenant_quota.update((q['resource'], q['limit']) for q in q_qry) return tenant_quota @staticmethod
**** CubicPower OpenStack Study **** def delete_tenant_quota(context, tenant_id): """Delete the quota entries for a given tenant_id. Atfer deletion, this tenant will use default quota values in conf. """ with context.session.begin(): tenant_quotas = context.session.query(Quota) tenant_quotas = tenant_quotas.filter_by(tenant_id=tenant_id) tenant_quotas.delete() @staticmethod
**** CubicPower OpenStack Study **** def get_all_quotas(context, resources): """Given a list of resources, retrieve the quotas for the all tenants. :param context: The request context, for access checks. :param resources: A dictionary of the registered resource keys. :return quotas: list of dict of tenant_id:, resourcekey1: resourcekey2: ... """ tenant_default = dict((key, resource.default) for key, resource in resources.items()) all_tenant_quotas = {} for quota in context.session.query(Quota): tenant_id = quota['tenant_id'] # avoid setdefault() because only want to copy when actually req'd tenant_quota = all_tenant_quotas.get(tenant_id) if tenant_quota is None: tenant_quota = tenant_default.copy() tenant_quota['tenant_id'] = tenant_id all_tenant_quotas[tenant_id] = tenant_quota tenant_quota[quota['resource']] = quota['limit'] return all_tenant_quotas.values() @staticmethod
**** CubicPower OpenStack Study **** def update_quota_limit(context, tenant_id, resource, limit): with context.session.begin(): tenant_quota = context.session.query(Quota).filter_by( tenant_id=tenant_id, resource=resource).first() if tenant_quota: tenant_quota.update({'limit': limit}) else: tenant_quota = Quota(tenant_id=tenant_id, resource=resource, limit=limit) context.session.add(tenant_quota)
**** CubicPower OpenStack Study **** def _get_quotas(self, context, tenant_id, resources, keys): """Retrieves the quotas for specific resources. 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 tenant_id: the tenant_id to check quota. :param resources: A dictionary of the registered resources. :param keys: A list of the desired quotas to retrieve. """ desired = set(keys) sub_resources = dict((k, v) for k, v in resources.items() if k in desired) # Make sure we accounted for all of them... if len(keys) != len(sub_resources): unknown = desired - set(sub_resources.keys()) raise exceptions.QuotaResourceUnknown(unknown=sorted(unknown)) # Grab and return the quotas (without usages) quotas = DbQuotaDriver.get_tenant_quotas( context, sub_resources, tenant_id) return dict((k, v) for k, v in quotas.items())
**** CubicPower OpenStack Study **** 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. This method will raise a QuotaResourceUnknown exception if a given resource is unknown or if it is not a simple limit resource. 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, values.keys()) # 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))
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