/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/proxy/zmq_publisher_proxy.py is in python-oslo.messaging 5.10.0-2.
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#
# 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 logging
from oslo_messaging._drivers.zmq_driver import zmq_async
from oslo_messaging._drivers.zmq_driver import zmq_names
from oslo_messaging._drivers.zmq_driver import zmq_socket
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
class PublisherProxy(object):
"""PUB/SUB based request publisher
The publisher intended to be used for Fanout and Notify
multi-sending patterns.
It differs from direct publishers like DEALER or PUSH based
in a way it treats matchmaker. Here all publishers register
in the matchmaker. Subscribers (server-side) take the list
of publishers and connect to all of them but subscribe
only to a specific topic-filtering tag generated from the
Target object.
"""
def __init__(self, conf, matchmaker):
super(PublisherProxy, self).__init__()
self.conf = conf
self.zmq_context = zmq.Context()
self.matchmaker = matchmaker
port = conf.zmq_proxy_opts.publisher_port
self.socket = zmq_socket.ZmqFixedPortSocket(
self.conf, self.zmq_context, zmq.PUB, conf.zmq_proxy_opts.host,
port) if port != 0 else \
zmq_socket.ZmqRandomPortSocket(
self.conf, self.zmq_context, zmq.PUB, conf.zmq_proxy_opts.host)
self.host = self.socket.connect_address
def send_request(self, multipart_message):
message_type = multipart_message.pop(0)
assert message_type in (zmq_names.CAST_FANOUT_TYPE,
zmq_names.NOTIFY_TYPE), "Fanout expected!"
topic_filter = multipart_message.pop(0)
reply_id = multipart_message.pop(0)
message_id = multipart_message.pop(0)
assert reply_id is not None, "Reply id expected!"
self.socket.send(topic_filter, zmq.SNDMORE)
self.socket.send(message_id, zmq.SNDMORE)
self.socket.send_multipart(multipart_message)
LOG.debug("Publishing message %(message_id)s on [%(topic)s]",
{"topic": topic_filter,
"message_id": message_id})
def cleanup(self):
self.socket.close()
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