package client import ( "context" "math" "time" "go.unistack.org/micro/v4/util/backoff" ) // BackoffFunc is the backoff call func type BackoffFunc func(ctx context.Context, req Request, attempts int) (time.Duration, error) // BackoffExp using exponential backoff func func BackoffExp(_ context.Context, _ Request, attempts int) (time.Duration, error) { return backoff.Do(attempts), nil } // BackoffInterval specifies randomization interval for backoff func func BackoffInterval(min time.Duration, max time.Duration) BackoffFunc { return func(_ context.Context, _ Request, attempts int) (time.Duration, error) { td := time.Duration(math.Pow(float64(attempts), math.E)) * time.Millisecond * 100 if td < min { return min, nil } else if td > max { return max, nil } return td, nil } }