code: func (s *Server) Nodes() (nis []krpc.NodeInfo) {
  	s.mu.Lock()
  	defer s.mu.Unlock()
  	s.table.forNodes(func(n *node) bool {
  		nis = append(nis, krpc.NodeInfo{
  			Addr: n.addr.KRPC(),
  			ID:   n.id.AsByteArray(),
  		})
  		return true
  	})
  	return
  }
docs: // Exports the current node table.