retry

type Backoff struct {
	// The initial duration.
	Duration time.Duration
	// Duration is multiplied by factor each iteration, if factor is not zero
	// and the limits imposed by Steps and Cap have not been reached.
	// Should not be negative.
	// The jitter does not contribute to the updates to the duration parameter.
	Factor float64
	// The sleep at each iteration is the duration plus an additional
	// amount chosen uniformly at random from the interval between
	// zero and `jitter*duration`.
	Jitter float64
	// The remaining number of iterations in which the duration
	// parameter may change (but progress can be stopped earlier by
	// hitting the cap). If not positive, the duration is not
	// changed. Used for exponential backoff in combination with
	// Factor and Cap.
	Steps int
	// A limit on revised values of the duration parameter. If a
	// multiplication by the factor parameter would make the duration
	// exceed the cap then the duration is set to the cap and the
	// steps parameter is set to zero.
	Cap time.Duration
	// The errors indicate that the request shouldn't do more retrying.
	NonRetriableErrors []string
	// The RetriableHTTPStatusCodes indicates that the HTTPStatusCode should do more retrying.
	RetriableHTTPStatusCodes []int
}

type Error struct {
	// Retriable indicates whether the request is retriable.
	Retriable bool
	// HTTPStatusCode indicates the response HTTP status code.
	HTTPStatusCode int
	// RetryAfter indicates the time when the request should retry after throttling.
	// A throttled request is retriable.
	RetryAfter time.Time
	// RetryAfter indicates the raw error from API.
	RawError error
}