Weight   uint16
}

// byPriorityWeight sorts SRV records by ascending priority and weight.
type byPriorityWeight []*SRV

// shuffleByWeight shuffles SRV records by weight using the algorithm
// described in RFC 2782.
func (addrs byPriorityWeight) shuffleByWeight() {
	sum := 0
	for _, addr := range addrs {
		sum += int(addr.Weight)
	}
	for sum > 0 && len(addrs) > 1 {
		s := 0
		n := randIntn(sum)

		sum += int(srv.Weight)
	}

	results := make(map[string]int)

	count := 10000
	for j := 0; j < count; j++ {
		d := make([]*SRV, len(data))
		copy(d, data)
		byPriorityWeight(d).shuffleByWeight()
		key := d[0].Target
		results[key] = results[key] + 1
	}

	actual := results[data[0].Target]
	expected := float64(count) * float64(data[0].Weight) / float64(sum)
	diff := float64(actual) - expected