Function AverageRate

tariff/tariffs.go:48–71

AverageRate returns the arithmetic mean of rates in [now, now+d), or nil if unavailable.

(t api.Tariff, d time.Duration)

// AverageRate returns the arithmetic mean of rates in [now, now+d), or nil if unavailable.
func AverageRate(t api.Tariff, d time.Duration) *float64 {
	rr := Rates(t)
	if rr == nil {
		return nil
	}

	now := time.Now()
	end := now.Add(d)

	var sum float64
	var count int
	for _, r := range rr {
		if r.Start.Before(end) && r.End.After(now) {
			sum += r.Value
			count++
		}
	}

	if count == 0 {
		return nil
	}

	return new(sum / float64(count))
}

func (t *Tariffs) Get(u api.TariffUsage) api.Tariff {
	// ensure tariff is not a wrapper