Function backoffInterval

retry.go:24–33

(min, max time.Duration)

type GetRetryIntervalFunc func(resp *Response, attempt int) time.Duration

func backoffInterval(min, max time.Duration) GetRetryIntervalFunc {
	base := float64(min)
	capLevel := float64(max)
	return func(resp *Response, attempt int) time.Duration {
		temp := math.Min(capLevel, base*math.Exp2(float64(attempt)))
		halfTemp := int64(temp / 2)
		sleep := halfTemp + rand.Int63n(halfTemp)
		return time.Duration(sleep)
	}
}

func newDefaultRetryOption() *retryOption {
	return &retryOption{