# Copyright 2015 Rackspace
#
# 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
from oslo_config import cfg
from oslo_log import log as logging
import oslo_messaging
import six
LOG = logging.getLogger(__name__)
[docs]@six.add_metaclass(abc.ABCMeta)
class EventStreamerBase(object):
"""Base class for EventStreamer
A stand in abstract class that defines what methods are stevedore loaded
implementations of event streamer is expected to provide.
"""
[docs] @abc.abstractmethod
def emit(self, cnt):
"""method to send a DB event to neutron-lbaas if it is needed.
:param cnt: an InfoContainer container object
:return: None
"""
[docs]class EventStreamerNoop(EventStreamerBase):
"""Nop class implementation of EventStreamer
Useful if you're running in standalone mode and don't need to send
updates to Neutron LBaaS
"""
[docs]class EventStreamerNeutron(EventStreamerBase):
"""Neutron LBaaS
When you're using Octavia alongside neutron LBaaS this class provides
a mechanism to send updates to neutron LBaaS database via
oslo_messaging queues.
"""
def __init__(self):
topic = cfg.CONF.oslo_messaging.event_stream_topic
self.transport = oslo_messaging.get_rpc_transport(cfg.CONF)
self.target = oslo_messaging.Target(topic=topic, exchange="common",
namespace='control', fanout=False,
version='1.0')
self.client = oslo_messaging.RPCClient(self.transport, self.target)
[docs] def emit(self, cnt):
LOG.debug("Emitting data to event streamer %s", cnt.to_dict())
self.client.cast({}, 'update_info', container=cnt.to_dict())
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