107 lines
3.1 KiB
Python
107 lines
3.1 KiB
Python
import traceback
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import eventlet.hubs
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from eventlet.support import greenlets as greenlet
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import six
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""" If true, captures a stack trace for each timer when constructed. This is
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useful for debugging leaking timers, to find out where the timer was set up. """
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_g_debug = False
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class Timer(object):
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def __init__(self, seconds, cb, *args, **kw):
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"""Create a timer.
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seconds: The minimum number of seconds to wait before calling
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cb: The callback to call when the timer has expired
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*args: The arguments to pass to cb
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**kw: The keyword arguments to pass to cb
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This timer will not be run unless it is scheduled in a runloop by
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calling timer.schedule() or runloop.add_timer(timer).
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"""
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self.seconds = seconds
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self.tpl = cb, args, kw
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self.called = False
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if _g_debug:
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self.traceback = six.StringIO()
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traceback.print_stack(file=self.traceback)
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@property
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def pending(self):
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return not self.called
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def __repr__(self):
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secs = getattr(self, 'seconds', None)
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cb, args, kw = getattr(self, 'tpl', (None, None, None))
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retval = "Timer(%s, %s, *%s, **%s)" % (
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secs, cb, args, kw)
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if _g_debug and hasattr(self, 'traceback'):
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retval += '\n' + self.traceback.getvalue()
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return retval
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def copy(self):
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cb, args, kw = self.tpl
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return self.__class__(self.seconds, cb, *args, **kw)
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def schedule(self):
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"""Schedule this timer to run in the current runloop.
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"""
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self.called = False
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self.scheduled_time = eventlet.hubs.get_hub().add_timer(self)
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return self
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def __call__(self, *args):
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if not self.called:
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self.called = True
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cb, args, kw = self.tpl
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try:
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cb(*args, **kw)
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finally:
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try:
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del self.tpl
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except AttributeError:
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pass
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def cancel(self):
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"""Prevent this timer from being called. If the timer has already
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been called or canceled, has no effect.
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"""
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if not self.called:
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self.called = True
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eventlet.hubs.get_hub().timer_canceled(self)
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try:
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del self.tpl
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except AttributeError:
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pass
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# No default ordering in 3.x. heapq uses <
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# FIXME should full set be added?
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def __lt__(self, other):
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return id(self) < id(other)
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class LocalTimer(Timer):
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def __init__(self, *args, **kwargs):
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self.greenlet = greenlet.getcurrent()
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Timer.__init__(self, *args, **kwargs)
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@property
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def pending(self):
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if self.greenlet is None or self.greenlet.dead:
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return False
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return not self.called
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def __call__(self, *args):
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if not self.called:
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self.called = True
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if self.greenlet is not None and self.greenlet.dead:
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return
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cb, args, kw = self.tpl
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cb(*args, **kw)
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def cancel(self):
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self.greenlet = None
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Timer.cancel(self)
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