Exponential backoff

[joel]

Add an algorithm used to space out repeated retries

[thomas-riboulet-finalcad]

good practices point out to using a growing delay between retries.

examples :

• https://dalibornasevic.com/posts/77-auto-reconnect-for-activerecord-connections
• https://github.com/lostisland/faraday/blob/master/lib/faraday/request/retry.rb

[joel]

awesome sample

def sleep_amount(retries)
  retry_index = @options.max - retries
  current_interval = @options.interval * (@options.backoff_factor ** retry_index)
  current_interval = [current_interval, @options.max_interval].min
  random_interval  = rand * @options.interval_randomness.to_f * @options.interval
  current_interval + random_interval
end