124 lines
3.6 KiB
Python
124 lines
3.6 KiB
Python
# Copyright 2015 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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import threading
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import eventlet
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import six
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from oslo_messaging._drivers import common as rpc_common
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from oslo_messaging._drivers.zmq_driver import zmq_poller
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LOG = logging.getLogger(__name__)
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class GreenPoller(zmq_poller.ZmqPoller):
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def __init__(self):
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self.incoming_queue = six.moves.queue.Queue()
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self.green_pool = eventlet.GreenPool()
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self.threads = []
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def register(self, socket, recv_method=None):
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self.threads.append(
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self.green_pool.spawn(self._socket_receive, socket,
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recv_method))
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def _socket_receive(self, socket, recv_method=None):
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while True:
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if recv_method:
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incoming = recv_method(socket)
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else:
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incoming = socket.recv_multipart()
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self.incoming_queue.put((incoming, socket))
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eventlet.sleep()
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def poll(self, timeout=None):
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incoming = None
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try:
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with eventlet.Timeout(timeout, exception=rpc_common.Timeout):
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while incoming is None:
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try:
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incoming = self.incoming_queue.get_nowait()
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except six.moves.queue.Empty:
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eventlet.sleep()
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except rpc_common.Timeout:
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return None, None
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return incoming[0], incoming[1]
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def close(self):
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for thread in self.threads:
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thread.kill()
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self.threads = []
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class HoldReplyPoller(GreenPoller):
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def __init__(self):
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super(HoldReplyPoller, self).__init__()
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self.event_by_socket = {}
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self._is_running = threading.Event()
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def register(self, socket, recv_method=None):
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super(HoldReplyPoller, self).register(socket, recv_method)
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self.event_by_socket[socket] = threading.Event()
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def resume_polling(self, socket):
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pause = self.event_by_socket[socket]
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pause.set()
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def _socket_receive(self, socket, recv_method=None):
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pause = self.event_by_socket[socket]
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while not self._is_running.is_set():
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pause.clear()
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if recv_method:
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incoming = recv_method(socket)
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else:
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incoming = socket.recv_multipart()
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self.incoming_queue.put((incoming, socket))
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pause.wait()
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def close(self):
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self._is_running.set()
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for pause in self.event_by_socket.values():
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pause.set()
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eventlet.sleep()
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super(HoldReplyPoller, self).close()
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class GreenExecutor(zmq_poller.Executor):
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def __init__(self, method):
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self._method = method
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super(GreenExecutor, self).__init__(None)
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def _loop(self):
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while True:
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self._method()
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eventlet.sleep()
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def execute(self):
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self.thread = eventlet.spawn(self._loop)
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def wait(self):
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if self.thread is not None:
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self.thread.wait()
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def stop(self):
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if self.thread is not None:
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self.thread.kill()
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