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#
# Copyright 2013 Red Hat, Inc.
#
# 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.
#
"""
Base RPC client and server common to all services.
"""
import oslo_messaging as messaging
from oslo_serialization import jsonutils
import nova.conf
from nova import rpc
CONF = nova.conf.CONF
_NAMESPACE = 'baseapi'
class BaseAPI(object):
"""Client side of the base rpc API.
API version history:
1.0 - Initial version.
1.1 - Add get_backdoor_port
"""
VERSION_ALIASES = {
# baseapi was added in havana
}
def __init__(self, topic):
super(BaseAPI, self).__init__()
target = messaging.Target(topic=topic,
namespace=_NAMESPACE,
version='1.0')
version_cap = self.VERSION_ALIASES.get(CONF.upgrade_levels.baseapi,
CONF.upgrade_levels.baseapi)
self.client = rpc.get_client(target, version_cap=version_cap)
def ping(self, context, arg, timeout=None):
arg_p = jsonutils.to_primitive(arg)
cctxt = self.client.prepare(timeout=timeout)
return cctxt.call(context, 'ping', arg=arg_p)
def get_backdoor_port(self, context, host):
cctxt = self.client.prepare(server=host, version='1.1')
return cctxt.call(context, 'get_backdoor_port')
class BaseRPCAPI(object):
"""Server side of the base RPC API."""
target = messaging.Target(namespace=_NAMESPACE, version='1.1')
def __init__(self, service_name, backdoor_port):
self.service_name = service_name
self.backdoor_port = backdoor_port
def ping(self, context, arg):
resp = {'service': self.service_name, 'arg': arg}
return jsonutils.to_primitive(resp)
def get_backdoor_port(self, context):
return self.backdoor_port