# -*- encoding: utf-8 -*-
#
# Copyright © 2013 Intel
#
# Author: Shuangtai Tian <shuangtai.tian@intel.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.

from oslo.config import cfg

from ceilometer import plugin


OPTS = [
    cfg.StrOpt('nova_control_exchange',
               default='nova',
               help="Exchange name for Nova notifications."),
]


cfg.CONF.register_opts(OPTS)


class ComputeNotificationBase(plugin.NotificationBase):
    @staticmethod
    def get_exchange_topics(conf):
        """Return a sequence of ExchangeTopics defining the exchange and
        topics to be connected for this plugin.
        """
        return [
            plugin.ExchangeTopics(
                exchange=conf.nova_control_exchange,
                topics=set(topic + ".info"
                           for topic in conf.notification_topics)),
        ]