116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
# @author Bob Ippolito
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#
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# Copyright (c) 2005-2006, Bob Ippolito
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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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#
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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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#
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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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import sys
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import select
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import errno
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from time import sleep
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import time
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from eventlet.hubs import hub
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EXC_MASK = select.POLLERR | select.POLLHUP | select.POLLNVAL
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READ_MASK = select.POLLIN
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WRITE_MASK = select.POLLOUT
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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.poll = select.poll()
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def add(self, evtype, fileno, cb):
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oldlisteners = self.listeners[evtype].get(fileno)
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listener = super(Hub, self).add(evtype, fileno, cb)
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if not oldlisteners:
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# Means we've added a new listener
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self.register(fileno)
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return listener
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def remove(self, listener):
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super(Hub, self).remove(listener)
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self.register(listener.fileno)
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def register(self, fileno):
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mask = 0
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if self.listeners['read'].get(fileno):
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mask |= READ_MASK
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if self.listeners['write'].get(fileno):
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mask |= WRITE_MASK
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if mask:
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self.poll.register(fileno, mask)
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else:
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try:
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self.poll.unregister(fileno)
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except KeyError:
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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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self.poll.unregister(fileno)
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except KeyError:
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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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sleep(seconds)
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return
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try:
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presult = self.poll.poll(seconds * 1000.0)
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except select.error, e:
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if e.args[0] == errno.EINTR:
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return
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raise
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SYSTEM_EXCEPTIONS = self.SYSTEM_EXCEPTIONS
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for fileno, event in presult:
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for dct, mask in ((readers, READ_MASK), (writers, WRITE_MASK)):
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if not mask & event:
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continue
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listeners = dct.get(fileno)
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if listeners:
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try:
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listeners[0](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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for fileno, event in presult:
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if not EXC_MASK & event:
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continue
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if event & select.POLLNVAL:
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self.remove_descriptor(fileno)
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continue
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for listeners in (readers.get(fileno), writers.get(fileno)):
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if listeners:
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try:
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listeners[0](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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