OpenStack library for messaging
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# Copyright 2013 Red Hat, Inc.
# Copyright 2013 New Dream Network, LLC (DreamHost)
# 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
# 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 sys
import eventlet
from import threading as greenthreading
from eventlet import greenpool
import greenlet
from oslo_utils import excutils
from oslo_messaging._executors import base
from oslo_messaging import localcontext
LOG = logging.getLogger(__name__)
def spawn_with(ctxt, pool):
"""This is the equivalent of a with statement
but with the content of the BLOCK statement executed
into a greenthread
exception path grab from:
def complete(thread, exit):
exc = True
except Exception:
exc = False
if not exit(*sys.exc_info()):
if exc:
exit(None, None, None)
callback = ctxt.__enter__()
thread = pool.spawn(callback), ctxt.__exit__)
return thread
class EventletExecutor(base.PooledExecutorBase):
"""A message executor which integrates with eventlet.
This is an executor which polls for incoming messages from a greenthread
and dispatches each message in its own greenthread.
The stop() method kills the message polling greenthread and the wait()
method waits for all message dispatch greenthreads to complete.
def __init__(self, conf, listener, dispatcher):
super(EventletExecutor, self).__init__(conf, listener, dispatcher)
self._thread = None
self._greenpool = greenpool.GreenPool(self.conf.rpc_thread_pool_size)
self._running = False
if not isinstance(localcontext._STORE, greenthreading.local):
LOG.debug('eventlet executor in use but the threading module '
'has not been monkeypatched or has been '
'monkeypatched after the oslo.messaging library '
'have been loaded. This will results in unpredictable '
'behavior. In the future, we will raise a '
'RuntimeException in this case.')
def start(self):
if self._thread is not None:
def _executor_thread():
while self._running:
incoming = self.listener.poll()
if incoming is not None:
except greenlet.GreenletExit:
self._running = True
self._thread = eventlet.spawn(_executor_thread)
def stop(self):
if self._thread is None:
self._running = False
def wait(self):
if self._thread is None:
except greenlet.GreenletExit:
self._thread = None