147 lines
4.5 KiB
Python
147 lines
4.5 KiB
Python
"""\
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@file libevent.py
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Copyright (c) 2007, Linden Research, Inc.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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import bisect
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import signal
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import sys
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import socket
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import errno
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import traceback
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import time
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from eventlet import greenlib
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from eventlet.timer import Timer
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from eventlet.hubs import hub
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import greenlet
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# XXX for debugging only
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#raise ImportError()
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try:
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# use rel if available
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import rel
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rel.initialize()
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rel.override()
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except ImportError:
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# don't have rel, but might still have libevent
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pass
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import event
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class Hub(hub.BaseHub):
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def __init__(self, clock=time.time):
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super(Hub, self).__init__(clock)
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self.interrupted = False
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event.init()
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sig = event.signal(signal.SIGINT, self.signal_received, signal.SIGINT)
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sig.add()
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def add_descriptor(self, fileno, read=None, write=None, exc=None):
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if read:
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evt = event.read(fileno, read, fileno)
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evt.add()
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self.readers[fileno] = evt, read
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if write:
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evt = event.write(fileno, write, fileno)
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evt.add()
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self.writers[fileno] = evt, write
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if exc:
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self.excs[fileno] = exc
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self.waiters_by_greenlet[greenlet.getcurrent()] = fileno
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def remove_descriptor(self, fileno):
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for queue in (self.readers, self.writers):
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tpl = queue.pop(fileno, None)
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if tpl is not None:
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tpl[0].delete()
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self.excs.pop(fileno, None)
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self.waiters_by_greenlet.pop(greenlet.getcurrent(), None)
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def abort(self):
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super(Hub, self).abort()
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event.abort()
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def signal_received(self, signal):
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# can't do more than set this flag here because the pyevent callback
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# mechanism swallows exceptions raised here, so we have to raise in
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# the 'main' greenlet (in wait()) to kill the program
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self.interrupted = True
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event.abort()
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def wait(self, seconds=None):
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# this timeout will cause us to return from the dispatch() call
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# when we want to
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timer = event.timeout(seconds, lambda: None)
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timer.add()
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try:
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status = event.dispatch()
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except self.SYSTEM_EXCEPTIONS:
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self.interrupted = True
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except:
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self.squelch_exception(-1, sys.exc_info())
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# we are explicitly ignoring the status because in our experience it's
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# harmless and there's nothing meaningful we could do with it anyway
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timer.delete()
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# raise any signals that deserve raising
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if self.interrupted:
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self.interrupted = False
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raise KeyboardInterrupt()
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def add_timer(self, timer):
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# store the pyevent timer object so that we can cancel later
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eventtimer = event.timeout(timer.seconds, timer)
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timer.impltimer = eventtimer
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eventtimer.add()
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self.track_timer(timer)
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def timer_finished(self, timer):
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try:
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timer.impltimer.delete()
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del timer.impltimer
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# XXX might this raise other exceptions? double delete?
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except (AttributeError, TypeError):
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pass
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finally:
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super(Hub, self).timer_finished(timer)
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def timer_canceled(self, timer):
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""" Cancels the underlying libevent timer. """
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try:
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timer.impltimer.delete()
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del timer.impltimer
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except (AttributeError, TypeError):
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pass
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finally:
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super(Hub, self).timer_canceled(timer)
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