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# Copyright (c) 2018 Intel Corporation
#
# 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.
import abc
import logging
from oslo_config import cfg
import oslo_messaging
import six
from yardstick.common import messaging
LOG = logging.getLogger(__name__)
@six.add_metaclass(abc.ABCMeta)
class NotificationHandler(object):
"""Abstract class to define a endpoint object for a MessagingConsumer"""
def __init__(self, _id, ctx_ids, queue):
super(NotificationHandler, self).__init__()
self._id = _id
self._ctx_ids = ctx_ids
self._queue = queue
@six.add_metaclass(abc.ABCMeta)
class MessagingConsumer(object):
"""Abstract class to implement a MQ consumer
This abstract class allows a class implementing this interface to receive
the messages published by a `MessagingNotifier`.
"""
def __init__(self, topic, ids, endpoints, fanout=True):
"""Init function.
:param topic: (string) MQ exchange topic
:param ids: (list of int) list of IDs of the processes implementing
the MQ Notifier which will be in the message context
:param endpoints: (list of class) list of classes implementing the
methods (see `MessagingNotifier.send_message) used by
the Notifier
:param fanout: (bool) MQ clients may request that a copy of the message
be delivered to all servers listening on a topic by
setting fanout to ``True``, rather than just one of them
:returns: `MessagingConsumer` class object
"""
self._ids = ids
self._endpoints = endpoints
self._transport = oslo_messaging.get_rpc_transport(
cfg.CONF, url=messaging.TRANSPORT_URL)
self._target = oslo_messaging.Target(topic=topic, fanout=fanout,
server=messaging.SERVER)
self._server = oslo_messaging.get_rpc_server(
self._transport, self._target, self._endpoints,
executor=messaging.RPC_SERVER_EXECUTOR,
access_policy=oslo_messaging.DefaultRPCAccessPolicy)
def start_rpc_server(self):
"""Start the RPC server."""
if self._server:
self._server.start()
def stop_rpc_server(self):
"""Stop the RPC server."""
if self._server:
self._server.stop()
def wait(self):
"""Wait for message processing to complete (blocking)."""
if self._server:
self._server.wait()
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