115 lines
3.5 KiB
Python
115 lines
3.5 KiB
Python
import os
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import sys
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from eventlet import patcher, support
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from eventlet.support import six
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select = patcher.original('select')
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time = patcher.original('time')
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from eventlet.hubs.hub import BaseHub, READ, WRITE, noop
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if getattr(select, 'kqueue', None) is None:
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raise ImportError('No kqueue implementation found in select module')
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FILTERS = {READ: select.KQ_FILTER_READ,
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WRITE: select.KQ_FILTER_WRITE}
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class Hub(BaseHub):
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MAX_EVENTS = 100
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def __init__(self, clock=None):
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super(Hub, self).__init__(clock)
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self._events = {}
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self._init_kqueue()
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def _init_kqueue(self):
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self.kqueue = select.kqueue()
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self._pid = os.getpid()
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def _reinit_kqueue(self):
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self.kqueue.close()
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self._init_kqueue()
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kqueue = self.kqueue
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events = [e for i in six.itervalues(self._events)
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for e in six.itervalues(i)]
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kqueue.control(events, 0, 0)
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def _control(self, events, max_events, timeout):
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try:
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return self.kqueue.control(events, max_events, timeout)
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except (OSError, IOError):
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# have we forked?
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if os.getpid() != self._pid:
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self._reinit_kqueue()
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return self.kqueue.control(events, max_events, timeout)
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raise
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def add(self, evtype, fileno, cb, tb, mac):
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listener = super(Hub, self).add(evtype, fileno, cb, tb, mac)
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events = self._events.setdefault(fileno, {})
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if evtype not in events:
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try:
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event = select.kevent(fileno, FILTERS.get(evtype), select.KQ_EV_ADD)
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self._control([event], 0, 0)
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events[evtype] = event
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except ValueError:
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super(Hub, self).remove(listener)
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raise
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return listener
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def _delete_events(self, events):
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del_events = [
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select.kevent(e.ident, e.filter, select.KQ_EV_DELETE)
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for e in events
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]
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self._control(del_events, 0, 0)
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def remove(self, listener):
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super(Hub, self).remove(listener)
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evtype = listener.evtype
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fileno = listener.fileno
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if not self.listeners[evtype].get(fileno):
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event = self._events[fileno].pop(evtype, None)
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if event is None:
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return
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try:
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self._delete_events((event,))
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except OSError:
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pass
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def remove_descriptor(self, fileno):
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super(Hub, self).remove_descriptor(fileno)
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try:
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events = self._events.pop(fileno).values()
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self._delete_events(events)
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except KeyError:
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pass
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except OSError:
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pass
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def wait(self, seconds=None):
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readers = self.listeners[READ]
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writers = self.listeners[WRITE]
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if not readers and not writers:
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if seconds:
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time.sleep(seconds)
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return
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result = self._control([], self.MAX_EVENTS, seconds)
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SYSTEM_EXCEPTIONS = self.SYSTEM_EXCEPTIONS
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for event in result:
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fileno = event.ident
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evfilt = event.filter
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try:
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if evfilt == FILTERS[READ]:
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readers.get(fileno, noop).cb(fileno)
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if evfilt == FILTERS[WRITE]:
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writers.get(fileno, noop).cb(fileno)
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except SYSTEM_EXCEPTIONS:
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raise
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except:
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self.squelch_exception(fileno, sys.exc_info())
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support.clear_sys_exc_info()
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