74 lines
2.5 KiB
Python
74 lines
2.5 KiB
Python
# Copyright 2014 eNovance.
|
|
#
|
|
# 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 aioeventlet
|
|
import trollius
|
|
|
|
from oslo_messaging._executors import impl_eventlet
|
|
|
|
|
|
class AsyncioEventletExecutor(impl_eventlet.EventletExecutor):
|
|
|
|
"""A message executor which integrates with eventlet and trollius.
|
|
|
|
The executor is based on eventlet executor and so is compatible with it.
|
|
The executor supports trollius coroutines, explicit asynchronous
|
|
programming, in addition to eventlet greenthreads, implicit asynchronous
|
|
programming.
|
|
|
|
To use the executor, an aioeventlet event loop must the running in the
|
|
thread executing the executor (usually the main thread). Example of code to
|
|
setup and run an aioeventlet event loop for the executor (in the main
|
|
thread):
|
|
|
|
import aioeventlet
|
|
import trollius
|
|
|
|
policy = aioeventlet.EventLoopPolicy()
|
|
trollius.set_event_loop_policy(policy)
|
|
|
|
def run_loop(loop):
|
|
loop.run_forever()
|
|
loop.close()
|
|
|
|
# Get the aioeventlet event loop (create it if needed)
|
|
loop = trollius.get_event_loop()
|
|
|
|
# run the event loop in a new greenthread,
|
|
# close it when it is done
|
|
eventlet.spawn(run_loop, loop)
|
|
"""
|
|
|
|
def __init__(self, conf, listener, dispatcher):
|
|
super(AsyncioEventletExecutor, self).__init__(conf, listener,
|
|
dispatcher)
|
|
self._loop = None
|
|
|
|
def start(self):
|
|
# check that the event loop is an aioeventlet event loop
|
|
loop = trollius.get_event_loop()
|
|
if not isinstance(loop, aioeventlet.EventLoop):
|
|
raise RuntimeError("need an aioeventlet event loop")
|
|
self._loop = loop
|
|
|
|
super(AsyncioEventletExecutor, self).start()
|
|
|
|
def _coroutine_wrapper(self, func, *args, **kw):
|
|
result = func(*args, **kw)
|
|
if trollius.iscoroutine(result):
|
|
result = aioeventlet.yield_future(result, loop=self._loop)
|
|
return result
|
|
|
|
_executor_callback = _coroutine_wrapper
|