89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
# 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 logging
|
|
import threading
|
|
|
|
from oslo_messaging._drivers.zmq_driver import zmq_async
|
|
from oslo_messaging._drivers.zmq_driver import zmq_poller
|
|
|
|
zmq = zmq_async.import_zmq()
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class ThreadingPoller(zmq_poller.ZmqPoller):
|
|
|
|
def __init__(self):
|
|
self.poller = zmq.Poller()
|
|
self.sockets_and_recv_methods = {}
|
|
|
|
def register(self, socket, recv_method=None):
|
|
socket_handle = socket.handle
|
|
if socket_handle in self.sockets_and_recv_methods:
|
|
return
|
|
LOG.debug("Registering socket %s", socket_handle.identity)
|
|
self.sockets_and_recv_methods[socket_handle] = (socket, recv_method)
|
|
self.poller.register(socket_handle, zmq.POLLIN)
|
|
|
|
def unregister(self, socket):
|
|
socket_handle = socket.handle
|
|
socket_and_recv_method = \
|
|
self.sockets_and_recv_methods.pop(socket_handle, None)
|
|
if socket_and_recv_method:
|
|
LOG.debug("Unregistering socket %s", socket_handle.identity)
|
|
self.poller.unregister(socket_handle)
|
|
|
|
def poll(self, timeout=None):
|
|
if timeout is not None and timeout > 0:
|
|
timeout *= 1000 # convert seconds to milliseconds
|
|
|
|
socket_handles = {}
|
|
try:
|
|
socket_handles = dict(self.poller.poll(timeout=timeout))
|
|
except zmq.ZMQError as e:
|
|
LOG.debug("Polling terminated with error: %s", e)
|
|
|
|
if not socket_handles:
|
|
return None, None
|
|
for socket_handle in socket_handles:
|
|
socket, recv_method = self.sockets_and_recv_methods[socket_handle]
|
|
if recv_method:
|
|
return recv_method(socket), socket
|
|
else:
|
|
return socket.recv_multipart(), socket
|
|
|
|
def close(self):
|
|
pass # Nothing to do for threading poller
|
|
|
|
|
|
class ThreadingExecutor(zmq_poller.Executor):
|
|
|
|
def __init__(self, method):
|
|
self._method = method
|
|
thread = threading.Thread(target=self._loop)
|
|
thread.daemon = True
|
|
super(ThreadingExecutor, self).__init__(thread)
|
|
self._stop = threading.Event()
|
|
|
|
def _loop(self):
|
|
while not self._stop.is_set():
|
|
self._method()
|
|
|
|
def execute(self):
|
|
self.thread.start()
|
|
|
|
def stop(self):
|
|
self._stop.set()
|