ctxutil

func DurationWithJitter ¶ added in v1.1.0

func DurationWithJitter(cap time.Duration, retry int64) time.Duration

DurationWithJitter returns an exponential backoff duration based on retry with random jitter. The maximum sleep is the cap. The minimum duration is at least 100 milliseconds.

Math/rand is good enough because we don't need the randomness to be cryptographically secure.

func Sleep ¶ added in v0.7.0

func Sleep(ctx context.Context, d time.Duration)

Sleep pauses the current goroutine until d has passed or ctx is canceled.

func SleepWithJitter ¶ added in v1.1.0

func SleepWithJitter(ctx context.Context, d time.Duration, attempts int64)

SleepWithJitter pauses the current goroutine until d + jitter has passed or ctx is canceled.

func WithDelay ¶

func WithDelay(done <-chan struct{}, delay time.Duration) (context.Context, context.CancelFunc)

WithDelay returns a context that is canceled after a given amount of time after done channel is closed.