/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/server/consumers/zmq_sub_consumer.py is in python-oslo.messaging 4.6.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | # 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
import threading
import uuid
import six
from oslo_messaging._drivers import base
from oslo_messaging._drivers.zmq_driver.server.consumers\
import zmq_consumer_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 _LE
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
class SubIncomingMessage(base.RpcIncomingMessage):
def __init__(self, request, socket, poller):
super(SubIncomingMessage, self).__init__(
request.context, request.message)
self.socket = socket
self.msg_id = request.message_id
poller.resume_polling(socket)
def reply(self, reply=None, failure=None, log_failure=True):
"""Reply is not needed for non-call messages."""
def acknowledge(self):
LOG.debug("Not sending acknowledge for %s", self.msg_id)
def requeue(self):
"""Requeue is not supported"""
class SubConsumer(zmq_consumer_base.ConsumerBase):
def __init__(self, conf, poller, server):
super(SubConsumer, self).__init__(conf, poller, server)
self.matchmaker = server.matchmaker
self.subscriptions = set()
self.targets = []
self._socket_lock = threading.Lock()
self.socket = zmq_socket.ZmqSocket(self.conf, self.context, zmq.SUB)
self.sockets.append(self.socket)
self.id = uuid.uuid4()
self.publishers_poller = MatchmakerPoller(
self.matchmaker, on_result=self.on_publishers)
def _subscribe_on_target(self, target):
topic_filter = zmq_address.target_to_subscribe_filter(target)
if target.topic:
self.socket.setsockopt(zmq.SUBSCRIBE, six.b(target.topic))
self.subscriptions.add(six.b(target.topic))
if target.server:
self.socket.setsockopt(zmq.SUBSCRIBE, six.b(target.server))
self.subscriptions.add(six.b(target.server))
if target.topic and target.server:
self.socket.setsockopt(zmq.SUBSCRIBE, topic_filter)
self.subscriptions.add(topic_filter)
LOG.debug("[%(host)s] Subscribing to topic %(filter)s",
{"host": self.id, "filter": topic_filter})
def on_publishers(self, publishers):
with self._socket_lock:
for host, sync in publishers:
self.socket.connect(zmq_address.get_tcp_direct_address(host))
self.poller.register(self.socket, self.receive_message)
LOG.debug("[%s] SUB consumer connected to publishers %s",
self.id, publishers)
def listen(self, target):
LOG.debug("Listen to target %s", target)
with self._socket_lock:
self._subscribe_on_target(target)
def _receive_request(self, socket):
topic_filter = socket.recv()
LOG.debug("[%(id)s] Received %(topic_filter)s topic",
{'id': self.id, 'topic_filter': topic_filter})
assert topic_filter in self.subscriptions
request = socket.recv_pyobj()
return request
def receive_message(self, socket):
try:
request = self._receive_request(socket)
if not request:
return None
LOG.debug("Received %(type)s, %(id)s, %(target)s",
{"type": request.msg_type,
"id": request.message_id,
"target": request.target})
if request.msg_type not in zmq_names.MULTISEND_TYPES:
LOG.error(_LE("Unknown message type: %s"), request.msg_type)
else:
return SubIncomingMessage(request, socket, self.poller)
except zmq.ZMQError as e:
LOG.error(_LE("Receiving message failed: %s"), str(e))
class MatchmakerPoller(object):
"""This entity performs periodical async polling
to the matchmaker if no hosts were registered for
specified target before.
"""
def __init__(self, matchmaker, on_result):
self.matchmaker = matchmaker
self.executor = zmq_async.get_executor(
method=self._poll_for_publishers)
self.on_result = on_result
self.executor.execute()
def _poll_for_publishers(self):
publishers = self.matchmaker.get_publishers()
if publishers:
self.on_result(publishers)
self.executor.done()
class BackChatter(object):
def __init__(self, conf, context):
self.socket = zmq_socket.ZmqSocket(conf, context, zmq.PUSH)
def connect(self, address):
self.socket.connect(address)
def send_ready(self):
for i in range(self.socket.connections_count()):
self.socket.send(zmq_names.ACK_TYPE)
def close(self):
self.socket.close()
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