backoff

type ErrFailedPermanently ¶

type ErrFailedPermanently struct {
	LastErr error
	// contains filtered or unexported fields
}

ErrFailedPermanently is an error raised by Do when the underlying Operation has been retried maxAttempts times.

func (e *ErrFailedPermanently) Error() string

type ExponentialStrategy ¶

type ExponentialStrategy struct {
	// Min is the minimum amount of time to wait between attempts in ms.
	Min float64

	// Max is the maximum amount of time to wait between attempts in ms.
	Max float64

	// MaxJitter is the maximum amount of random jitter to insert between
	// attempts in ms.
	MaxJitter int
}

ExponentialStrategy performs exponential backoff. The exponential backoff function is min(e.Min + (2^attempt * 1000) + randBetween(0, e.MaxJitter), e.Max)

func (e *ExponentialStrategy) Duration(attempt int) time.Duration

type FixedStrategy ¶

type FixedStrategy struct {
	Dur time.Duration
}

func (f *FixedStrategy) Duration(attempt int) time.Duration

type Operation ¶

type Operation func() error

Operation represents an operation that will be retried based on some backoff strategy if it fails.

type Strategy ¶

type Strategy interface {
	// Duration returns how long to wait for a given retry attempt.
	Duration(attempt int) time.Duration
}

Strategy is used to calculate how long a particular Operation should wait between attempts.

func Exponential() Strategy

func Fixed(dur time.Duration) Strategy