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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
import os
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 MessagingProducer(object):
"""Abstract class to implement a MQ producer
This abstract class allows a class implementing this interface to publish
messages in a message queue.
"""
def __init__(self, topic, pid=os.getpid(), fanout=True):
"""Init function.
:param topic: (string) MQ exchange topic
:param pid: (int) PID of the process implementing this MQ 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: `MessagingNotifier` class object
"""
self._topic = topic
self._pid = pid
self._fanout = fanout
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._notifier = oslo_messaging.RPCClient(self._transport,
self._target)
def send_message(self, method, payload):
"""Send a cast message, that will invoke a method without blocking.
The cast() method is used to invoke an RPC method that does not return
a value. cast() RPC requests may be broadcast to all Servers listening
on a given topic by setting the fanout Target property to ``True``.
:param methos: (string) method name, that must be implemented in the
consumer endpoints
:param payload: (subclass `Payload`) payload content
"""
self._notifier.cast({'pid': self._pid},
method,
**payload.obj_to_dict())
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