network: split Peer's NetAddr into RemoteAddr and PeerAddr

As they are different things used for different purposes.

pkg/network/helper_test.go

@@ -158,7 +158,10 @@ func newLocalPeer(t *testing.T) *localPeer {
 	}
 }
 
-func (p *localPeer) NetAddr() *net.TCPAddr {
+func (p *localPeer) RemoteAddr() net.Addr {
+	return &p.netaddr
+}
+func (p *localPeer) PeerAddr() net.Addr {
 	return &p.netaddr
 }
 func (p *localPeer) Disconnect(err error) {}

pkg/network/peer.go

@@ -8,7 +8,15 @@ import (
 
 // Peer represents a network node neo-go is connected to.
 type Peer interface {
-	NetAddr() *net.TCPAddr
+	// RemoteAddr returns the remote address that we're connected to now.
+	RemoteAddr() net.Addr
+	// PeerAddr returns the remote address that should be used to establish
+	// a new connection to the node. It can differ from the RemoteAddr
+	// address in case where the remote node is a client and its current
+	// connection port is different from the one the other node should use
+	// to connect to it. It's only valid after the handshake is completed,
+	// before that it returns the same address as RemoteAddr.
+	PeerAddr() net.Addr
 	Disconnect(error)
 	WriteMsg(msg *Message) error
 	Done() chan error

pkg/network/server.go

@@ -160,12 +160,12 @@ func (s *Server) run() {
 			// When a new peer is connected we send out our version immediately.
 			if err := s.sendVersion(p); err != nil {
 				log.WithFields(log.Fields{
-					"addr": p.NetAddr(),
+					"addr": p.RemoteAddr(),
 				}).Error(err)
 			}
 			s.peers[p] = true
 			log.WithFields(log.Fields{
-				"addr": p.NetAddr(),
+				"addr": p.RemoteAddr(),
 			}).Info("new peer connected")
 			updatePeersConnectedMetric(s.PeerCount())
 
@@ -173,11 +173,11 @@ func (s *Server) run() {
 			if s.peers[drop.peer] {
 				delete(s.peers, drop.peer)
 				log.WithFields(log.Fields{
-					"addr":      drop.peer.NetAddr(),
+					"addr":      drop.peer.RemoteAddr(),
 					"reason":    drop.reason,
 					"peerCount": s.PeerCount(),
 				}).Warn("peer disconnected")
-				addr := drop.peer.NetAddr().String()
+				addr := drop.peer.PeerAddr().String()
 				s.discovery.UnregisterConnectedAddr(addr)
 				s.discovery.BackFill(addr)
 				updatePeersConnectedMetric(s.PeerCount())
@@ -205,13 +205,13 @@ func (s *Server) PeerCount() int {
 // every ProtoTickInterval with the peer.
 func (s *Server) startProtocol(p Peer) {
 	log.WithFields(log.Fields{
-		"addr":        p.NetAddr(),
+		"addr":        p.RemoteAddr(),
 		"userAgent":   string(p.Version().UserAgent),
 		"startHeight": p.Version().StartHeight,
 		"id":          p.Version().Nonce,
 	}).Info("started protocol")
 
-	s.discovery.RegisterGoodAddr(p.NetAddr().String())
+	s.discovery.RegisterGoodAddr(p.PeerAddr().String())
 	err := s.requestHeaders(p)
 	if err != nil {
 		p.Disconnect(err)

pkg/network/tcp_peer.go

@@ -2,8 +2,8 @@ package network
 
 import (
 	"errors"
-	"fmt"
 	"net"
+	"strconv"
 	"sync"
 
 	"github.com/CityOfZion/neo-go/pkg/io"
@@ -30,7 +30,6 @@ var (
 type TCPPeer struct {
 	// underlying TCP connection.
 	conn net.Conn
-	addr net.TCPAddr
 
 	// The version of the peer.
 	version *payload.Version
@@ -44,13 +43,9 @@ type TCPPeer struct {
 
 // NewTCPPeer returns a TCPPeer structure based on the given connection.
 func NewTCPPeer(conn net.Conn) *TCPPeer {
-	raddr := conn.RemoteAddr()
-	// can't fail because raddr is a real connection
-	tcpaddr, _ := net.ResolveTCPAddr(raddr.Network(), raddr.String())
 	return &TCPPeer{
 		conn: conn,
 		done: make(chan error, 1),
-		addr: *tcpaddr,
 	}
 }
 
@@ -123,9 +118,28 @@ func (p *TCPPeer) HandleVersionAck() error {
 	return nil
 }
 
-// NetAddr implements the Peer interface.
+// RemoteAddr implements the Peer interface.
-func (p *TCPPeer) NetAddr() *net.TCPAddr {
+func (p *TCPPeer) RemoteAddr() net.Addr {
-	return &p.addr
+	return p.conn.RemoteAddr()
+}
+
+// PeerAddr implements the Peer interface.
+func (p *TCPPeer) PeerAddr() net.Addr {
+	remote := p.conn.RemoteAddr()
+	// The network can be non-tcp in unit tests.
+	if !p.Handshaked() || remote.Network() != "tcp" {
+		return p.RemoteAddr()
+	}
+	host, _, err := net.SplitHostPort(remote.String())
+	if err != nil {
+		return p.RemoteAddr()
+	}
+	addrString := net.JoinHostPort(host, strconv.Itoa(int(p.version.Port)))
+	tcpAddr, err := net.ResolveTCPAddr("tcp", addrString)
+	if err != nil {
+		return p.RemoteAddr()
+	}
+	return tcpAddr
 }
 
 // Done implements the Peer interface and notifies

pkg/rpc/server.go

@@ -196,7 +196,7 @@ Methods:
 		}
 
 		for addr := range s.coreServer.Peers() {
-			peers.AddPeer("connected", addr.NetAddr().String())
+			peers.AddPeer("connected", addr.PeerAddr().String())
 		}
 
 		results = peers