class Stripe::StripeClient

def self.sleep_time(num_retries, config: Stripe.config)
  # Apply exponential backoff with initial_network_retry_delay on the
  # number of num_retries so far as inputs. Do not allow the number to
  # exceed max_network_retry_delay.
  sleep_seconds = [
    config.initial_network_retry_delay * (2**(num_retries - 1)),
    config.max_network_retry_delay,
  ].min
  # Apply some jitter by randomizing the value in the range of
  # (sleep_seconds / 2) to (sleep_seconds).
  sleep_seconds *= (0.5 * (1 + rand))
  # But never sleep less than the base sleep seconds.
  [config.initial_network_retry_delay, sleep_seconds].max
end