Method At

api/rates.go:33–48

At returns the rate for given timestamp or error. Rates MUST be sorted by start time.

(ts time.Time)

// At returns the rate for given timestamp or error.
// Rates MUST be sorted by start time.
func (rr Rates) At(ts time.Time) (Rate, error) {
	if i, ok := slices.BinarySearchFunc(rr, ts, func(r Rate, ts time.Time) int {
		switch {
		case ts.Before(r.Start):
			return +1
		case !ts.Before(r.End):
			return -1
		default:
			return 0
		}
	}); ok {
		return rr[i], nil
	}

	return Rate{}, ErrNotAvailable
}

var _ BytesMarshaler = (*Rates)(nil)