# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
#
# 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.

"""
Client side of the heat worker RPC API.
"""

from heat.common import messaging
from heat.rpc import worker_api


class WorkerClient(object):
    '''Client side of the heat worker RPC API.

    API version history::

        1.0 - Initial version.
    '''

    BASE_RPC_API_VERSION = '1.0'

    def __init__(self):
        self._client = messaging.get_rpc_client(
            topic=worker_api.TOPIC,
            version=self.BASE_RPC_API_VERSION)

    @staticmethod
    def make_msg(method, **kwargs):
        return method, kwargs

    def cast(self, ctxt, msg, version=None):
        method, kwargs = msg
        if version is not None:
            client = self._client.prepare(version=version)
        else:
            client = self._client
        client.cast(ctxt, method, **kwargs)