From e34d1341022a51d8a86c4836c91e4e0ded888d27 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Sat, 7 Feb 2015 00:13:22 +0100
Subject: p2p: fixes for actual connections

The unit test hooks were turned on 'in production'.
---
 p2p/peer.go | 37 +++++++++++++++++++++----------------
 1 file changed, 21 insertions(+), 16 deletions(-)

(limited to 'p2p/peer.go')

diff --git a/p2p/peer.go b/p2p/peer.go
index 1fa8264a3..b61cf96da 100644
--- a/p2p/peer.go
+++ b/p2p/peer.go
@@ -1,6 +1,7 @@
 package p2p
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -71,7 +72,8 @@ type Peer struct {
 	runlock   sync.RWMutex // protects running
 	running   map[string]*proto
 
-	protocolHandshakeEnabled bool
+	// disables protocol handshake, for testing
+	noHandshake bool
 
 	protoWG  sync.WaitGroup
 	protoErr chan error
@@ -134,11 +136,11 @@ func (p *Peer) Disconnect(reason DiscReason) {
 
 // String implements fmt.Stringer.
 func (p *Peer) String() string {
-	return fmt.Sprintf("Peer %.8x %v", p.remoteID, p.RemoteAddr())
+	return fmt.Sprintf("Peer %.8x %v", p.remoteID[:], p.RemoteAddr())
 }
 
 func newPeer(conn net.Conn, protocols []Protocol, ourName string, ourID, remoteID *discover.NodeID) *Peer {
-	logtag := fmt.Sprintf("Peer %.8x %v", remoteID, conn.RemoteAddr())
+	logtag := fmt.Sprintf("Peer %.8x %v", remoteID[:], conn.RemoteAddr())
 	return &Peer{
 		Logger:    logger.NewLogger(logtag),
 		rw:        newFrameRW(conn, msgWriteTimeout),
@@ -164,33 +166,35 @@ func (p *Peer) run() DiscReason {
 	var readErr = make(chan error, 1)
 	defer p.closeProtocols()
 	defer close(p.closed)
-	defer p.rw.Close()
 
-	// start the read loop
 	go func() { readErr <- p.readLoop() }()
 
-	if p.protocolHandshakeEnabled {
+	if !p.noHandshake {
 		if err := writeProtocolHandshake(p.rw, p.ourName, *p.ourID, p.protocols); err != nil {
 			p.DebugDetailf("Protocol handshake error: %v\n", err)
+			p.rw.Close()
 			return DiscProtocolError
 		}
 	}
 
-	// wait for an error or disconnect
+	// Wait for an error or disconnect.
 	var reason DiscReason
 	select {
 	case err := <-readErr:
 		// We rely on protocols to abort if there is a write error. It
 		// might be more robust to handle them here as well.
 		p.DebugDetailf("Read error: %v\n", err)
-		reason = DiscNetworkError
+		p.rw.Close()
+		return DiscNetworkError
+
 	case err := <-p.protoErr:
 		reason = discReasonForError(err)
 	case reason = <-p.disc:
 	}
-	if reason != DiscNetworkError {
-		p.politeDisconnect(reason)
-	}
+	p.politeDisconnect(reason)
+
+	// Wait for readLoop. It will end because conn is now closed.
+	<-readErr
 	p.Debugf("Disconnected: %v\n", reason)
 	return reason
 }
@@ -198,9 +202,9 @@ func (p *Peer) run() DiscReason {
 func (p *Peer) politeDisconnect(reason DiscReason) {
 	done := make(chan struct{})
 	go func() {
-		// send reason
 		EncodeMsg(p.rw, discMsg, uint(reason))
-		// discard any data that might arrive
+		// Wait for the other side to close the connection.
+		// Discard any data that they send until then.
 		io.Copy(ioutil.Discard, p.rw)
 		close(done)
 	}()
@@ -208,10 +212,11 @@ func (p *Peer) politeDisconnect(reason DiscReason) {
 	case <-done:
 	case <-time.After(disconnectGracePeriod):
 	}
+	p.rw.Close()
 }
 
 func (p *Peer) readLoop() error {
-	if p.protocolHandshakeEnabled {
+	if !p.noHandshake {
 		if err := readProtocolHandshake(p, p.rw); err != nil {
 			return err
 		}
@@ -264,7 +269,7 @@ func readProtocolHandshake(p *Peer, rw MsgReadWriter) error {
 		return newPeerError(errProtocolBreach, "expected handshake, got %x", msg.Code)
 	}
 	if msg.Size > baseProtocolMaxMsgSize {
-		return newPeerError(errMisc, "message too big")
+		return newPeerError(errInvalidMsg, "message too big")
 	}
 	var hs handshake
 	if err := msg.Decode(&hs); err != nil {
@@ -326,7 +331,7 @@ func (p *Peer) startProto(offset uint64, impl Protocol) *proto {
 		err := impl.Run(p, rw)
 		if err == nil {
 			p.DebugDetailf("Protocol %s/%d returned\n", impl.Name, impl.Version)
-			err = newPeerError(errMisc, "protocol returned")
+			err = errors.New("protocol returned")
 		} else {
 			p.DebugDetailf("Protocol %s/%d error: %v\n", impl.Name, impl.Version, err)
 		}
-- 
cgit