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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 eventlet
from oslo_messaging._drivers.zmq_driver import zmq_poller
LOG = logging.getLogger(__name__)
class GreenPoller(zmq_poller.ZmqPoller):
def __init__(self):
self.incoming_queue = eventlet.queue.LightQueue()
self.thread_by_socket = {}
def register(self, socket, recv_method=None):
if socket not in self.thread_by_socket:
LOG.debug("Registering socket %s", socket.handle.identity)
self.thread_by_socket[socket] = eventlet.spawn(
self._socket_receive, socket, recv_method
)
def unregister(self, socket):
thread = self.thread_by_socket.pop(socket, None)
if thread:
LOG.debug("Unregistering socket %s", socket.handle.identity)
thread.kill()
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):
try:
return self.incoming_queue.get(timeout=timeout)
except eventlet.queue.Empty:
return None, None
def close(self):
for thread in self.thread_by_socket.values():
thread.kill()
self.thread_by_socket = {}
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):
if self.thread is None:
self.thread = eventlet.spawn(self._loop)
def stop(self):
if self.thread is not None:
self.thread.kill()
self.thread = None
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