131 lines
4.6 KiB
Python
131 lines
4.6 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 contextlib
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import logging
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import uuid
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import six
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import oslo_messaging
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from oslo_messaging._drivers import common as rpc_common
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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_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_names
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from oslo_messaging._i18n import _LE, _LI
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LOG = logging.getLogger(__name__)
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zmq = zmq_async.import_zmq()
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class ReqPublisher(zmq_publisher_base.PublisherBase):
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def __init__(self, conf, matchmaker):
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super(ReqPublisher, self).__init__(conf)
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self.matchmaker = matchmaker
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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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socket, connect_address = self._connect_to_host(request.target,
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request.timeout)
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request.host = connect_address
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self._send_request(socket, request)
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return self._receive_reply(socket, request)
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def _resolve_host_address(self, target, timeout=0):
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host = self.matchmaker.get_single_host(
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target, zmq_names.socket_type_str(zmq.ROUTER), timeout)
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return zmq_address.get_tcp_direct_address(host)
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def _connect_to_host(self, target, timeout=0):
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try:
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self.zmq_context = zmq.Context()
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socket = self.zmq_context.socket(zmq.REQ)
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if six.PY3:
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socket.setsockopt_string(zmq.IDENTITY, str(uuid.uuid1()))
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else:
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socket.identity = str(uuid.uuid1())
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connect_address = self._resolve_host_address(target, timeout)
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LOG.info(_LI("Connecting REQ to %s") % connect_address)
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socket.connect(connect_address)
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self.outbound_sockets[str(target)] = socket
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return socket, connect_address
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except zmq.ZMQError as e:
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errmsg = _LE("Error connecting to socket: %s") % str(e)
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LOG.error(_LE("Error connecting to socket: %s") % str(e))
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raise rpc_common.RPCException(errmsg)
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@staticmethod
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def _receive_reply(socket, request):
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def _receive_method(socket):
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reply = socket.recv_pyobj()
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LOG.debug("Received reply %s" % reply)
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return reply
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LOG.debug("Start waiting reply")
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# NOTE(ozamiatin): Check for retry here (no retries now)
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with contextlib.closing(zmq_async.get_reply_poller()) as poller:
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poller.register(socket, recv_method=_receive_method)
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reply, socket = poller.poll(timeout=request.timeout)
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if reply is None:
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raise oslo_messaging.MessagingTimeout(
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"Timeout %s seconds was reached" % request.timeout)
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LOG.debug("Received reply %s" % reply)
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if reply[zmq_names.FIELD_FAILURE]:
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raise rpc_common.deserialize_remote_exception(
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reply[zmq_names.FIELD_FAILURE],
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request.allowed_remote_exmods)
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else:
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return reply[zmq_names.FIELD_REPLY]
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def close(self):
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# For contextlib compatibility
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self.cleanup()
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class ReqPublisherLight(ReqPublisher):
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def __init__(self, conf, matchmaker):
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super(ReqPublisherLight, self).__init__(conf, matchmaker)
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def _resolve_host_address(self, target, timeout=0):
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return zmq_address.get_broker_address(self.conf)
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def _send_request(self, socket, request):
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LOG.debug("Sending %(type)s message_id %(message)s"
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" to a target %(target)s, host:%(host)s"
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% {"type": request.msg_type,
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"message": request.message_id,
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"target": request.target,
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"host": request.host})
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envelope = request.create_envelope()
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socket.send_pyobj(envelope, zmq.SNDMORE)
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socket.send_pyobj(request)
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