code: func (n *Network) PeerAddress(p *Peer, portName PortName) string {
  	return fmt.Sprintf("127.0.0.1:%d", n.PeerPort(p, portName))
  }
docs: // PeerAddress returns the address (host and port) exposed by the Peer for the
  // named port. Command line tools should use the returned address when
  // connecting to a peer.
  //
  // This assumes that the peer is listening on 0.0.0.0 and is available on the
  // loopback address.