116 lines
3.9 KiB
Python
116 lines
3.9 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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from oslo_messaging._drivers.zmq_driver.client.publishers\
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import zmq_publisher_base
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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._i18n import _LI, _LW
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LOG = logging.getLogger(__name__)
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zmq = zmq_async.import_zmq()
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class DealerPublisher(zmq_publisher_base.PublisherMultisend):
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def __init__(self, conf, matchmaker):
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super(DealerPublisher, self).__init__(conf, matchmaker, zmq.DEALER)
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self.ack_receiver = AcknowledgementReceiver()
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def send_request(self, request):
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if request.msg_type == zmq_names.CALL_TYPE:
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raise zmq_publisher_base.UnsupportedSendPattern(request.msg_type)
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dealer_socket, hosts = self._check_hosts_connections(request.target)
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if not dealer_socket.connections:
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# NOTE(ozamiatin): Here we can provide
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# a queue for keeping messages to send them later
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# when some listener appears. However such approach
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# being more reliable will consume additional memory.
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LOG.warning(_LW("Request %s was dropped because no connection")
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% request.msg_type)
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return
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self.ack_receiver.track_socket(dealer_socket.handle)
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if request.msg_type in zmq_names.MULTISEND_TYPES:
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for _ in range(dealer_socket.connections_count()):
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self._send_request(dealer_socket, request)
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else:
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self._send_request(dealer_socket, request)
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def _send_request(self, socket, request):
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socket.send(b'', zmq.SNDMORE)
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socket.send_pyobj(request)
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LOG.info(_LI("Sending message %(message)s to a target %(target)s")
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% {"message": request.message,
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"target": request.target})
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def cleanup(self):
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self.ack_receiver.cleanup()
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super(DealerPublisher, self).cleanup()
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class DealerPublisherLight(zmq_publisher_base.PublisherBase):
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def __init__(self, conf, address):
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super(DealerPublisherLight, self).__init__(conf)
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self.socket = self.zmq_context.socket(zmq.DEALER)
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self.socket.connect(address)
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def send_request(self, request):
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if request.msg_type == zmq_names.CALL_TYPE:
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raise zmq_publisher_base.UnsupportedSendPattern(request.msg_type)
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self.socket.send(b'', zmq.SNDMORE)
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self.socket.send_pyobj(request)
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def cleanup(self):
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self.socket.setsockopt(zmq.LINGER, 0)
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self.socket.close()
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class AcknowledgementReceiver(object):
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def __init__(self):
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self.poller = zmq_async.get_poller()
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self.thread = zmq_async.get_executor(self.poll_for_acknowledgements)
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self.thread.execute()
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def _receive_acknowledgement(self, socket):
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empty = socket.recv()
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assert empty == b"", "Empty delimiter expected"
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ack_message = socket.recv_pyobj()
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return ack_message
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def track_socket(self, socket):
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self.poller.register(socket, self._receive_acknowledgement)
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def poll_for_acknowledgements(self):
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ack_message, socket = self.poller.poll()
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LOG.info(_LI("Message %s acknowledged")
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% ack_message[zmq_names.FIELD_ID])
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def cleanup(self):
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self.thread.stop()
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self.poller.close()
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