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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 logging
import threading
import eventlet
import six
from oslo_messaging._drivers import common as rpc_common
from oslo_messaging._drivers.zmq_driver import zmq_async
from oslo_messaging._drivers.zmq_driver import zmq_poller
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
class GreenPoller(zmq_poller.ZmqPoller):
def __init__(self):
self.incoming_queue = six.moves.queue.Queue()
self.green_pool = eventlet.GreenPool()
self.sockets = []
def register(self, socket, recv_method=None):
self.sockets.append(socket)
return self.green_pool.spawn(self._socket_receive, socket,
recv_method)
def _socket_receive(self, socket, recv_method=None):
while True:
if recv_method:
incoming = recv_method(socket)
else:
incoming = socket.recv_multipart()
self.incoming_queue.put((incoming, socket))
eventlet.sleep()
def poll(self, timeout=None):
incoming = None
try:
with eventlet.Timeout(timeout, exception=rpc_common.Timeout):
while incoming is None:
try:
incoming = self.incoming_queue.get_nowait()
except six.moves.queue.Empty:
eventlet.sleep()
except rpc_common.Timeout:
return None, None
return incoming[0], incoming[1]
class HoldReplyPoller(GreenPoller):
def __init__(self):
super(HoldReplyPoller, self).__init__()
self.event_by_socket = {}
def register(self, socket, recv_method=None):
super(HoldReplyPoller, self).register(socket, recv_method)
self.event_by_socket[socket] = threading.Event()
def resume_polling(self, socket):
pause = self.event_by_socket[socket]
pause.set()
def _socket_receive(self, socket, recv_method=None):
pause = self.event_by_socket[socket]
while True:
pause.clear()
if recv_method:
incoming = recv_method(socket)
else:
incoming = socket.recv_multipart()
self.incoming_queue.put((incoming, socket))
pause.wait()
class GreenExecutor(zmq_poller.Executor):
def __init__(self, method):
self._method = method
super(GreenExecutor, self).__init__(None)
def _loop(self):
while True:
self._method()
eventlet.sleep()
def execute(self):
self.thread = eventlet.spawn(self._loop)
def wait(self):
if self.thread is not None:
self.thread.wait()
def stop(self):
if self.thread is not None:
self.thread.kill()
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