//NodesForGet returns nodes which has datfile cache , and that extends nodes to #searchDepth .
func NodesForGet(datfile string, searchDepth int) node.Slice {
	var ns, ns2 node.Slice
	ns = ns.Extend(Get(datfile, nil))
	ns = ns.Extend(Get(list, nil))
	ns = ns.Extend(Random(ns, 0))

	for _, n := range ns {
		if !n.Equals(node.Me(true)) && n.IsAllowed() {
			ns2 = append(ns2, n)
		}
	}
	if ns2.Len() > searchDepth {
		ns2 = ns2[:searchDepth]
	}
	return ns2
}