code: func (n *Node) GetMemberByNodeID(nodeID string) *membership.Member {
  	members := n.cluster.Members()
  	for _, member := range members {
  		if member.NodeID == nodeID {
  			return member
  		}
  	}
  	return nil
  }
docs: // GetMemberByNodeID returns member information based
  // on its generic Node ID.