func getDialableListenAddrs(ph host.Host) ([]*net.TCPAddr, error) { var out []*net.TCPAddr for _, addr := range ph.Addrs() { na, err := manet.ToNetAddr(addr) if err != nil { continue } tcp, ok := na.(*net.TCPAddr) if ok { out = append(out, tcp) } } if len(out) == 0 { return nil, errors.New("failed to find good external addr from peerhost") } return out, nil }