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import datetime class NeverExpires(object): def expired(self): return False class Timer(object): """A simple timer that will indicate when an expiration time has passed.""" def __init__(self, expiration): 'Create a timer that expires at `expiration` (UTC datetime)' self.expiration = expiration @classmethod def after(cls, elapsed): """Return a timer that will expire after `elapsed` passes.""" return cls( datetime.datetime.now(datetime.timezone.utc) + elapsed, ) def expired(self): return datetime.datetime.now( datetime.timezone.utc, ) >= self.expiration class LockTimeout(Exception): 'An exception when a lock could not be acquired before a timeout period' class LockChecker(object): """Keep track of the time and detect if a timeout has expired.""" def __init__(self, session_id, timeout): self.session_id = session_id if timeout: self.timer = Timer.after(timeout) else: self.timer = NeverExpires() def expired(self): if self.timer.expired(): raise LockTimeout( 'Timeout acquiring lock for %(session_id)s' % vars(self)) return False
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