p2p: log remote reason when disconnect is requested

The returned reason is currently not used except for the log
message. This change makes the log messages a bit more useful.
The handshake code also returns the remote reason.

p2p/peer.go

@@ -131,10 +131,11 @@ func (p *Peer) run() DiscReason {
 	case err := <-p.protoErr:
 		reason = discReasonForError(err)
 	case reason = <-p.disc:
+		p.politeDisconnect(reason)
+		reason = DiscRequested
 	}
 
 	close(p.closed)
-	p.politeDisconnect(reason)
 	p.wg.Wait()
 	glog.V(logger.Debug).Infof("%v: Disconnected: %v\n", p, reason)
 	return reason
@@ -191,7 +192,7 @@ func (p *Peer) handle(msg Msg) error {
 		// check errors because, the connection will be closed after it.
 		rlp.Decode(msg.Payload, &reason)
 		glog.V(logger.Debug).Infof("%v: Disconnect Requested: %v\n", p, reason[0])
-		return DiscRequested
+		return reason[0]
 	case msg.Code < baseProtocolLength:
 		// ignore other base protocol messages
 		return msg.Discard()

p2p/peer_test.go

@@ -172,12 +172,13 @@ func TestPeerDisconnect(t *testing.T) {
 	if err := SendItems(rw, discMsg, DiscQuitting); err != nil {
 		t.Fatal(err)
 	}
-	if err := ExpectMsg(rw, discMsg, []interface{}{DiscRequested}); err != nil {
-		t.Error(err)
-	}
-	closer()
-	if reason := <-disc; reason != DiscRequested {
-		t.Errorf("run returned wrong reason: got %v, want %v", reason, DiscRequested)
+	select {
+	case reason := <-disc:
+		if reason != DiscQuitting {
+			t.Errorf("run returned wrong reason: got %v, want %v", reason, DiscRequested)
+		}
+	case <-time.After(500 * time.Millisecond):
+		t.Error("peer did not return")
 	}
 }