OpenStack Study: kvs.py

**** CubicPower OpenStack Study ****

# Copyright 2012 OpenStack Foundation

#

# 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.

"""

An in memory implementation of the trusts API.

only to be used for testing purposes

"""

import copy

from keystone.common import kvs

from keystone import exception

from keystone.openstack.common import timeutils

from keystone import trust

**** CubicPower OpenStack Study ****

def _filter_trust(ref):

    if ref['deleted']:

        return None

    if ref.get('expires_at') and timeutils.utcnow() > ref['expires_at']:

        return None

    remaining_uses = ref.get('remaining_uses')

    # Do not return trusts that can't be used anymore

    if remaining_uses is not None:

        if remaining_uses <= 0:

            return None

    ref = copy.deepcopy(ref)

    return ref

**** CubicPower OpenStack Study ****

class Trust(kvs.Base, trust.Driver):

**** CubicPower OpenStack Study ****

    def create_trust(self, trust_id, trust, roles):

        trust_ref = copy.deepcopy(trust)

        trust_ref['id'] = trust_id

        trust_ref['deleted'] = False

        trust_ref['roles'] = roles

        if (trust_ref.get('expires_at') and

                trust_ref['expires_at'].tzinfo is not None):

                    trust_ref['expires_at'] = (timeutils.normalize_time

                                               (trust_ref['expires_at']))

        self.db.set('trust-%s' % trust_id, trust_ref)

        trustee_user_id = trust_ref['trustee_user_id']

        trustee_list = self.db.get('trustee-%s' % trustee_user_id, [])

        trustee_list.append(trust_id)

        self.db.set('trustee-%s' % trustee_user_id, trustee_list)

        trustor_user_id = trust_ref['trustor_user_id']

        trustor_list = self.db.get('trustor-%s' % trustor_user_id, [])

        trustor_list.append(trust_id)

        self.db.set('trustor-%s' % trustor_user_id, trustor_list)

        return trust_ref

**** CubicPower OpenStack Study ****

    def consume_use(self, trust_id):

        try:

            orig_ref = self.db.get('trust-%s' % trust_id)

        except exception.NotFound:

            raise exception.TrustNotFound(trust_id=trust_id)

        remaining_uses = orig_ref.get('remaining_uses')

        if remaining_uses is None:

            # unlimited uses, do nothing

            return

        elif remaining_uses > 0:

            ref = copy.deepcopy(orig_ref)

            ref['remaining_uses'] -= 1

            self.db.set('trust-%s' % trust_id, ref)

        else:

            raise exception.TrustUseLimitReached(trust_id=trust_id)

**** CubicPower OpenStack Study ****

    def get_trust(self, trust_id):

        try:

            ref = self.db.get('trust-%s' % trust_id)

            return _filter_trust(ref)

        except exception.NotFound:

            return None

**** CubicPower OpenStack Study ****

    def delete_trust(self, trust_id):

        try:

            ref = self.db.get('trust-%s' % trust_id)

        except exception.NotFound:

            raise exception.TrustNotFound(trust_id=trust_id)

        ref['deleted'] = True

        self.db.set('trust-%s' % trust_id, ref)

**** CubicPower OpenStack Study ****

    def list_trusts(self):

        trusts = []

        for key, value in self.db.items():

            if key.startswith("trust-") and not value['deleted']:

                trusts.append(value)

        return trusts

**** CubicPower OpenStack Study ****

    def list_trusts_for_trustee(self, trustee_user_id):

        trusts = []

        for trust in self.db.get('trustee-%s' % trustee_user_id, []):

            trusts.append(self.get_trust(trust))

        return trusts

**** CubicPower OpenStack Study ****

    def list_trusts_for_trustor(self, trustor_user_id):

        trusts = []

        for trust in self.db.get('trustor-%s' % trustor_user_id, []):

            trusts.append(self.get_trust(trust))

        return trusts