Container Infrastructure Management Service for OpenStack
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# Copyright 2014 - Rackspace Hosting
#
# 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.
"""Common RPC service and API tools for Magnum."""
import oslo_messaging as messaging
from oslo_messaging.rpc import dispatcher
from oslo_service import service
from oslo_utils import importutils
from magnum.common import profiler
from magnum.common import rpc
import magnum.conf
from magnum.objects import base as objects_base
from magnum.service import periodic
from magnum.servicegroup import magnum_service_periodic as servicegroup
osprofiler = importutils.try_import("osprofiler.profiler")
CONF = magnum.conf.CONF
def _init_serializer():
serializer = rpc.RequestContextSerializer(
objects_base.MagnumObjectSerializer())
if osprofiler:
serializer = rpc.ProfilerRequestContextSerializer(serializer)
else:
serializer = rpc.RequestContextSerializer(serializer)
return serializer
class Service(service.Service):
def __init__(self, topic, server, handlers, binary):
super(Service, self).__init__()
serializer = _init_serializer()
transport = messaging.get_rpc_transport(CONF)
# TODO(asalkeld) add support for version='x.y'
access_policy = dispatcher.DefaultRPCAccessPolicy
target = messaging.Target(topic=topic, server=server)
self._server = messaging.get_rpc_server(transport, target, handlers,
executor='eventlet',
serializer=serializer,
access_policy=access_policy)
self.binary = binary
profiler.setup(binary, CONF.host)
def start(self):
self._server.start()
def create_periodic_tasks(self):
if CONF.periodic_enable:
periodic.setup(CONF, self.tg)
servicegroup.setup(CONF, self.binary, self.tg)
def stop(self):
if self._server:
self._server.stop()
self._server.wait()
super(Service, self).stop()
@classmethod
def create(cls, topic, server, handlers, binary):
service_obj = cls(topic, server, handlers, binary)
return service_obj
class API(object):
def __init__(self, transport=None, context=None, topic=None, server=None,
timeout=None):
serializer = _init_serializer()
if transport is None:
exmods = rpc.get_allowed_exmods()
transport = messaging.get_rpc_transport(
CONF, allowed_remote_exmods=exmods)
self._context = context
if topic is None:
topic = ''
target = messaging.Target(topic=topic, server=server)
self._client = messaging.RPCClient(transport, target,
serializer=serializer,
timeout=timeout)
def _call(self, method, *args, **kwargs):
return self._client.call(self._context, method, *args, **kwargs)
def _cast(self, method, *args, **kwargs):
self._client.cast(self._context, method, *args, **kwargs)
def echo(self, message):
self._cast('echo', message=message)