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# 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 abc
import logging
import six
from oslo_messaging._drivers import common as rpc_common
from oslo_messaging._drivers.zmq_driver.matchmaker import zmq_matchmaker_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._drivers.zmq_driver import zmq_updater
from oslo_messaging._i18n import _LE, _LI, _LW
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
@six.add_metaclass(abc.ABCMeta)
class ConsumerBase(object):
def __init__(self, conf, poller, server):
self.conf = conf
self.poller = poller
self.server = server
self.sockets = []
self.context = zmq.Context()
def stop(self):
"""Stop consumer polling/updating."""
@abc.abstractmethod
def receive_request(self, socket):
"""Receive a request via a socket."""
def cleanup(self):
for socket in self.sockets:
if not socket.handle.closed:
socket.close()
self.sockets = []
class SingleSocketConsumer(ConsumerBase):
def __init__(self, conf, poller, server, socket_type):
super(SingleSocketConsumer, self).__init__(conf, poller, server)
self.matchmaker = server.matchmaker
self.target = server.target
self.socket_type = socket_type
self.host = None
self.socket = self.subscribe_socket(socket_type)
self.target_updater = TargetUpdater(
conf, self.matchmaker, self.target, self.host, socket_type)
def stop(self):
self.target_updater.stop()
def subscribe_socket(self, socket_type):
try:
socket = zmq_socket.ZmqRandomPortSocket(
self.conf, self.context, socket_type)
self.sockets.append(socket)
LOG.debug("Run %(stype)s consumer on %(addr)s:%(port)d",
{"stype": zmq_names.socket_type_str(socket_type),
"addr": socket.bind_address,
"port": socket.port})
self.host = zmq_address.combine_address(
self.conf.oslo_messaging_zmq.rpc_zmq_host, socket.port)
self.poller.register(socket, self.receive_request)
return socket
except zmq.ZMQError as e:
errmsg = _LE("Failed binding to port %(port)d: %(e)s")\
% (self.port, e)
LOG.error(_LE("Failed binding to port %(port)d: %(e)s"),
(self.port, e))
raise rpc_common.RPCException(errmsg)
@property
def address(self):
return self.socket.bind_address
@property
def port(self):
return self.socket.port
def cleanup(self):
self.target_updater.cleanup()
super(SingleSocketConsumer, self).cleanup()
class TargetUpdater(zmq_updater.UpdaterBase):
"""This entity performs periodic async updates
to the matchmaker.
"""
def __init__(self, conf, matchmaker, target, host, socket_type):
self.target = target
self.host = host
self.socket_type = socket_type
self.conf = conf
self.matchmaker = matchmaker
self._sleep_for = conf.oslo_messaging_zmq.zmq_target_update
# NOTE(ozamiatin): Update target immediately not waiting
# for background executor to initialize.
self._update_target()
super(TargetUpdater, self).__init__(
conf, matchmaker, self._update_target,
conf.oslo_messaging_zmq.zmq_target_update)
def _update_target(self):
try:
self.matchmaker.register(
self.target, self.host,
zmq_names.socket_type_str(self.socket_type),
expire=self.conf.oslo_messaging_zmq.zmq_target_expire)
if self._sleep_for != \
self.conf.oslo_messaging_zmq.zmq_target_update:
self._sleep_for = \
self.conf.oslo_messaging_zmq.zmq_target_update
LOG.info(_LI("Falling back to the normal update %d sec")
% self._sleep_for)
except zmq_matchmaker_base.MatchmakerUnavailable:
# Update target frequently until first successful update
# After matchmaker is back update normally as of config
self._sleep_for = 10
LOG.warning(_LW("Failed connecting to the Matchmaker, "
"update each %d sec") % self._sleep_for)
def stop(self):
super(TargetUpdater, self).stop()
self.matchmaker.unregister(
self.target, self.host,
zmq_names.socket_type_str(self.socket_type))
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