82 lines
3.2 KiB
Python
82 lines
3.2 KiB
Python
# Copyright 2015 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import six
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from oslo_messaging._drivers.zmq_driver.server.consumers \
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import zmq_consumer_base
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from oslo_messaging._drivers.zmq_driver.server import zmq_incoming_message
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from oslo_messaging._drivers.zmq_driver import zmq_address
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from oslo_messaging._drivers.zmq_driver import zmq_async
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from oslo_messaging._drivers.zmq_driver import zmq_socket
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from oslo_messaging._i18n import _LE
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LOG = logging.getLogger(__name__)
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zmq = zmq_async.import_zmq()
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class SubConsumer(zmq_consumer_base.ConsumerBase):
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def __init__(self, conf, poller, server):
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super(SubConsumer, self).__init__(conf, poller, server)
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self.matchmaker = server.matchmaker
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self.target = server.target
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self.socket = zmq_socket.ZmqSocket(self.conf, self.context, zmq.SUB)
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self.sockets.append(self.socket)
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self._subscribe_on_target(self.target)
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self.on_publishers(self.matchmaker.get_publishers())
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self.poller.register(self.socket, self.receive_message)
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def on_publishers(self, publishers):
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for host, sync in publishers:
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self.socket.connect(zmq_address.get_tcp_direct_address(host))
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LOG.debug("[%s] SUB consumer connected to publishers %s",
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self.socket.handle.identity, publishers)
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def _subscribe_on_target(self, target):
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topic_filter = zmq_address.target_to_subscribe_filter(target)
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if target.topic:
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self.socket.setsockopt(zmq.SUBSCRIBE, six.b(target.topic))
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if target.server:
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self.socket.setsockopt(zmq.SUBSCRIBE, six.b(target.server))
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if target.topic and target.server:
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self.socket.setsockopt(zmq.SUBSCRIBE, topic_filter)
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LOG.debug("[%(host)s] Subscribing to topic %(filter)s",
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{"host": self.socket.handle.identity,
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"filter": topic_filter})
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@staticmethod
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def _receive_request(socket):
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topic_filter = socket.recv()
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message_id = socket.recv()
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context, message = socket.recv_loaded()
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LOG.debug("Received %(topic_filter)s topic message %(id)s",
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{'id': message_id, 'topic_filter': topic_filter})
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return context, message
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def receive_message(self, socket):
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try:
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context, message = self._receive_request(socket)
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if not message:
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return None
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return zmq_incoming_message.ZmqIncomingMessage(context, message)
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except (zmq.ZMQError, AssertionError) as e:
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LOG.error(_LE("Receiving message failed: %s"), str(e))
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def cleanup(self):
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super(SubConsumer, self).cleanup()
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