153 lines
6.0 KiB
Python
153 lines
6.0 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.proxy import zmq_publisher_proxy
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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_names
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from oslo_messaging._drivers.zmq_driver import zmq_socket
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from oslo_messaging._drivers.zmq_driver import zmq_updater
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from oslo_messaging._i18n import _LI
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zmq = zmq_async.import_zmq()
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LOG = logging.getLogger(__name__)
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class UniversalQueueProxy(object):
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def __init__(self, conf, context, matchmaker):
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self.conf = conf
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self.context = context
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super(UniversalQueueProxy, self).__init__()
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self.matchmaker = matchmaker
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self.poller = zmq_async.get_poller()
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port = conf.zmq_proxy_opts.frontend_port
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host = conf.zmq_proxy_opts.host
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self.fe_router_socket = zmq_socket.ZmqFixedPortSocket(
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conf, context, zmq.ROUTER, host,
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conf.zmq_proxy_opts.frontend_port) if port != 0 else \
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zmq_socket.ZmqRandomPortSocket(conf, context, zmq.ROUTER, host)
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port = conf.zmq_proxy_opts.backend_port
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self.be_router_socket = zmq_socket.ZmqFixedPortSocket(
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conf, context, zmq.ROUTER, host,
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conf.zmq_proxy_opts.backend_port) if port != 0 else \
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zmq_socket.ZmqRandomPortSocket(conf, context, zmq.ROUTER, host)
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self.poller.register(self.fe_router_socket.handle,
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self._receive_in_request)
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self.poller.register(self.be_router_socket.handle,
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self._receive_in_request)
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self.pub_publisher = zmq_publisher_proxy.PublisherProxy(
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conf, matchmaker)
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self._router_updater = RouterUpdater(
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conf, matchmaker, self.pub_publisher.host,
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self.fe_router_socket.connect_address,
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self.be_router_socket.connect_address)
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def run(self):
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message, socket = self.poller.poll()
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if message is None:
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return
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msg_type = message[0]
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if self.conf.oslo_messaging_zmq.use_pub_sub and \
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msg_type in (zmq_names.CAST_FANOUT_TYPE,
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zmq_names.NOTIFY_TYPE):
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self.pub_publisher.send_request(message)
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else:
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self._redirect_message(self.be_router_socket.handle
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if socket is self.fe_router_socket.handle
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else self.fe_router_socket.handle, message)
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@staticmethod
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def _receive_in_request(socket):
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try:
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reply_id = socket.recv()
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assert reply_id is not None, "Valid id expected"
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empty = socket.recv()
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assert empty == b'', "Empty delimiter expected"
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msg_type = int(socket.recv())
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routing_key = socket.recv()
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payload = socket.recv_multipart()
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payload.insert(0, reply_id)
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payload.insert(0, routing_key)
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payload.insert(0, msg_type)
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return payload
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except (AssertionError, ValueError, zmq.ZMQError):
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LOG.error("Received message with wrong format")
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return None
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@staticmethod
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def _redirect_message(socket, multipart_message):
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message_type = multipart_message.pop(0)
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routing_key = multipart_message.pop(0)
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reply_id = multipart_message.pop(0)
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message_id = multipart_message[0]
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socket.send(routing_key, zmq.SNDMORE)
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socket.send(b'', zmq.SNDMORE)
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socket.send(reply_id, zmq.SNDMORE)
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socket.send(six.b(str(message_type)), zmq.SNDMORE)
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LOG.debug("Dispatching %(msg_type)s message %(msg_id)s - to %(rkey)s" %
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{"msg_type": zmq_names.message_type_str(message_type),
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"msg_id": message_id,
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"rkey": routing_key})
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socket.send_multipart(multipart_message)
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def cleanup(self):
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self.fe_router_socket.close()
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self.be_router_socket.close()
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self.pub_publisher.cleanup()
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self._router_updater.cleanup()
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class RouterUpdater(zmq_updater.UpdaterBase):
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"""This entity performs periodic async updates
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from router proxy to the matchmaker.
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"""
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def __init__(self, conf, matchmaker, publisher_address, fe_router_address,
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be_router_address):
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self.publisher_address = publisher_address
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self.fe_router_address = fe_router_address
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self.be_router_address = be_router_address
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super(RouterUpdater, self).__init__(conf, matchmaker,
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self._update_records)
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def _update_records(self):
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self.matchmaker.register_publisher(
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(self.publisher_address, self.fe_router_address),
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expire=self.conf.oslo_messaging_zmq.zmq_target_expire)
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LOG.info(_LI("[PUB:%(pub)s, ROUTER:%(router)s] Update PUB publisher"),
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{"pub": self.publisher_address,
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"router": self.fe_router_address})
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self.matchmaker.register_router(
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self.be_router_address,
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expire=self.conf.oslo_messaging_zmq.zmq_target_expire)
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LOG.info(_LI("[Backend ROUTER:%(router)s] Update ROUTER"),
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{"router": self.be_router_address})
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def cleanup(self):
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super(RouterUpdater, self).cleanup()
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self.matchmaker.unregister_publisher(
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(self.publisher_address, self.fe_router_address))
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self.matchmaker.unregister_router(
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self.be_router_address)
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