//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
}
//Random selects # of min(all # of nodes,n) nodes randomly except exclude nodes.
func Random(exclude node.Slice, num int) []*node.Node {
all := getAllNodes()
if exclude != nil {
cand := make([]*node.Node, 0, len(all))
m := exclude.ToMap()
for _, n := range all {
if _, exist := m[n.Nodestr]; !exist {
cand = append(cand, n)
}
}
all = cand
}
n := all.Len()
if num < n && num != 0 {
n = num
}
r := make([]*node.Node, n)
rs := rand.Perm(all.Len())
for i := 0; i < n; i++ {
r[i] = all[rs[i]]
}
return r
}