// Unmarshal decodes raw data into a *Node instance.
// The conversion uses an intermediate PBNode.
func (n *Node) Unmarshal(encoded []byte) error {
var pbn pb.PBNode
if err := pbn.Unmarshal(encoded); err != nil {
return fmt.Errorf("Unmarshal failed. %v", err)
}
pbnl := pbn.GetLinks()
n.Links = make([]*Link, len(pbnl))
for i, l := range pbnl {
n.Links[i] = &Link{Name: l.GetName(), Size: l.GetTsize()}
h, err := mh.Cast(l.GetHash())
if err != nil {
return fmt.Errorf("Link hash is not valid multihash. %v", err)
}
n.Links[i].Hash = h
}
n.Data = pbn.GetData()
return nil
}
// Resolve implements Resolver
// TXT records for a given domain name should contain a b58
// encoded multihash.
func (r *DNSResolver) Resolve(name string) (string, error) {
log.Info("DNSResolver resolving %v", name)
txt, err := net.LookupTXT(name)
if err != nil {
return "", err
}
for _, t := range txt {
chk := b58.Decode(t)
if len(chk) == 0 {
continue
}
_, err := mh.Cast(chk)
if err != nil {
continue
}
return t, nil
}
return "", ErrResolveFailed
}