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98 lines
2.9 KiB
98 lines
2.9 KiB
import zmq
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import gevent
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from gevent import select
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from zmq import Poller as _original_Poller
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class _Poller(_original_Poller):
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"""Replacement for :class:`zmq.Poller`
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Ensures that the greened Poller below is used in calls to
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:meth:`zmq.Poller.poll`.
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"""
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_gevent_bug_timeout = 1.33 # minimum poll interval, for working around gevent bug
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def _get_descriptors(self):
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"""Returns three elements tuple with socket descriptors ready
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for gevent.select.select
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"""
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rlist = []
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wlist = []
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xlist = []
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for socket, flags in self.sockets:
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if isinstance(socket, zmq.Socket):
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rlist.append(socket.getsockopt(zmq.FD))
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continue
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elif isinstance(socket, int):
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fd = socket
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elif hasattr(socket, 'fileno'):
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try:
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fd = int(socket.fileno())
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except:
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raise ValueError('fileno() must return an valid integer fd')
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else:
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raise TypeError('Socket must be a 0MQ socket, an integer fd '
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'or have a fileno() method: %r' % socket)
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if flags & zmq.POLLIN:
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rlist.append(fd)
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if flags & zmq.POLLOUT:
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wlist.append(fd)
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if flags & zmq.POLLERR:
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xlist.append(fd)
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return (rlist, wlist, xlist)
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def poll(self, timeout=-1):
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"""Overridden method to ensure that the green version of
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Poller is used.
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Behaves the same as :meth:`zmq.core.Poller.poll`
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"""
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if timeout is None:
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timeout = -1
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if timeout < 0:
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timeout = -1
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rlist = None
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wlist = None
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xlist = None
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if timeout > 0:
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tout = gevent.Timeout.start_new(timeout/1000.0)
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else:
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tout = None
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try:
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# Loop until timeout or events available
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rlist, wlist, xlist = self._get_descriptors()
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while True:
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events = super(_Poller, self).poll(0)
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if events or timeout == 0:
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return events
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# wait for activity on sockets in a green way
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# set a minimum poll frequency,
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# because gevent < 1.0 cannot be trusted to catch edge-triggered FD events
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_bug_timeout = gevent.Timeout.start_new(self._gevent_bug_timeout)
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try:
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select.select(rlist, wlist, xlist)
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except gevent.Timeout as t:
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if t is not _bug_timeout:
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raise
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finally:
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_bug_timeout.cancel()
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except gevent.Timeout as t:
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if t is not tout:
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raise
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return []
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finally:
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if timeout > 0:
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tout.cancel()
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