/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/client/publishers/zmq_pub_publisher.py is in python-oslo.messaging 4.6.1-2ubuntu1.
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The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | # Copyright 2015 Mirantis, Inc.
#
# 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.client.publishers\
import zmq_publisher_base
from oslo_messaging._drivers.zmq_driver import zmq_address
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
from oslo_messaging._i18n import _LI
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
class PubPublisherProxy(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(PubPublisherProxy, self).__init__()
self.conf = conf
self.zmq_context = zmq.Context()
self.matchmaker = matchmaker
self.socket = zmq_socket.ZmqRandomPortSocket(
self.conf, self.zmq_context, zmq.PUB)
self.host = zmq_address.combine_address(self.conf.rpc_zmq_host,
self.socket.port)
self.sync_channel = SyncChannel(conf, matchmaker, self.zmq_context)
LOG.info(_LI("[PUB:%(pub)s, PULL:%(pull)s] Run PUB publisher"),
{"pub": self.host,
"pull": self.sync_channel.sync_host})
self.matchmaker.register_publisher(
(self.host, self.sync_channel.sync_host))
def send_request(self, multipart_message):
envelope = multipart_message[zmq_names.MULTIPART_IDX_ENVELOPE]
msg_type = envelope[zmq_names.FIELD_MSG_TYPE]
target = envelope[zmq_names.FIELD_TARGET]
message_id = envelope[zmq_names.FIELD_MSG_ID]
if msg_type not in zmq_names.MULTISEND_TYPES:
raise zmq_publisher_base.UnsupportedSendPattern(msg_type)
topic_filter = zmq_address.target_to_subscribe_filter(target)
self.socket.send(topic_filter, zmq.SNDMORE)
self.socket.send(multipart_message[zmq_names.MULTIPART_IDX_BODY])
LOG.debug("Publishing message [%(topic)s] %(message_id)s to "
"a target %(target)s ",
{"message_id": message_id,
"target": target,
"topic": topic_filter})
def cleanup(self):
self.matchmaker.unregister_publisher(
(self.host, self.sync_channel.sync_host))
self.socket.close()
class SyncChannel(object):
"""Subscribers synchronization channel
As far as PUB/SUB is one directed way pattern we need some
backwards channel to have a possibility of subscribers
to talk back to publisher.
May be used for heartbeats or some kind of acknowledgments etc.
"""
def __init__(self, conf, matchmaker, context):
self.conf = conf
self.matchmaker = matchmaker
self.context = context
self._ready = None
# NOTE(ozamiatin): May be used for heartbeats when we
# implement them
self.sync_socket = zmq_socket.ZmqRandomPortSocket(
self.conf, self.context, zmq.PULL)
self.poller = zmq_async.get_poller()
self.poller.register(self.sync_socket)
self.sync_host = zmq_address.combine_address(self.conf.rpc_zmq_host,
self.sync_socket.port)
def is_ready(self):
LOG.debug("[%s] Waiting for ready from first subscriber",
self.sync_host)
if self._ready is None:
self._ready = self.poller.poll()
LOG.debug("[%s] Received ready from first subscriber",
self.sync_host)
return self._ready is not None
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