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import random class ExponentialBackoff: """ Keeps track of a backoff delay that staggers down and staggers up exponentially. """ def __init__(self, start_delay, max_delay): self._error_count = 0 # A tally of server errors self._start_delay = start_delay self._max_delay = max_delay def decrease(self): """Decreases error count with zero being the lowest""" self._error_count -= 1 self._error_count = max(self._error_count, 0) def increase(self): """Increases error count but not higher than gives the max delay""" if self.get_delay() < self._max_delay: self._error_count += 1 def get_delay(self): """ Calculates the delay using formula that gives this chart. In this specific example start is 5 seconds and max is 60 seconds Count Delay 0 0 1 5 2 10 3 20 4 40 5 60 (max) """ if self._error_count: delay = (2 ** (self._error_count - 1)) * self._start_delay else: delay = 0 return min(int(delay), self._max_delay) def get_random_delay(self, stagger_fraction=0.25): """ Adds randomne