codekingpro/portable-devtools

1import traceback2 3import eventlet.hubs4from eventlet.support import greenlets as greenlet5import six6 7""" If true, captures a stack trace for each timer when constructed.  This is8useful for debugging leaking timers, to find out where the timer was set up. """9_g_debug = False10 11 12class Timer(object):13    def __init__(self, seconds, cb, *args, **kw):14        """Create a timer.15            seconds: The minimum number of seconds to wait before calling16            cb: The callback to call when the timer has expired17            *args: The arguments to pass to cb18            **kw: The keyword arguments to pass to cb19 20        This timer will not be run unless it is scheduled in a runloop by21        calling timer.schedule() or runloop.add_timer(timer).22        """23        self.seconds = seconds24        self.tpl = cb, args, kw25        self.called = False26        if _g_debug:27            self.traceback = six.StringIO()28            traceback.print_stack(file=self.traceback)29 30    @property31    def pending(self):32        return not self.called33 34    def __repr__(self):35        secs = getattr(self, 'seconds', None)36        cb, args, kw = getattr(self, 'tpl', (None, None, None))37        retval = "Timer(%s, %s, *%s, **%s)" % (38            secs, cb, args, kw)39        if _g_debug and hasattr(self, 'traceback'):40            retval += '\n' + self.traceback.getvalue()41        return retval42 43    def copy(self):44        cb, args, kw = self.tpl45        return self.__class__(self.seconds, cb, *args, **kw)46 47    def schedule(self):48        """Schedule this timer to run in the current runloop.49        """50        self.called = False51        self.scheduled_time = eventlet.hubs.get_hub().add_timer(self)52        return self53 54    def __call__(self, *args):55        if not self.called:56            self.called = True57            cb, args, kw = self.tpl58            try:59                cb(*args, **kw)60            finally:61                try:62                    del self.tpl63                except AttributeError:64                    pass65 66    def cancel(self):67        """Prevent this timer from being called. If the timer has already68        been called or canceled, has no effect.69        """70        if not self.called:71            self.called = True72            eventlet.hubs.get_hub().timer_canceled(self)73            try:74                del self.tpl75            except AttributeError:76                pass77 78    # No default ordering in 3.x. heapq uses <79    # FIXME should full set be added?80    def __lt__(self, other):81        return id(self) < id(other)82 83 84class LocalTimer(Timer):85 86    def __init__(self, *args, **kwargs):87        self.greenlet = greenlet.getcurrent()88        Timer.__init__(self, *args, **kwargs)89 90    @property91    def pending(self):92        if self.greenlet is None or self.greenlet.dead:93            return False94        return not self.called95 96    def __call__(self, *args):97        if not self.called:98            self.called = True99            if self.greenlet is not None and self.greenlet.dead:100                return101            cb, args, kw = self.tpl102            cb(*args, **kw)103 104    def cancel(self):105        self.greenlet = None106        Timer.cancel(self)107