misc other fixes

src/yggdrasil/conn.go

@@ -102,11 +102,12 @@ func (c *Conn) search() error {
 					if sinfo != nil {
 						// Need to clean up to avoid a session leak
 						sinfo.cancel.Cancel(nil)
+						sinfo.sessions.removeSession(sinfo)
 					}
 				default:
 					if sinfo != nil {
 						// Finish initializing the session
-						sinfo.conn = c
+						sinfo.setConn(nil, c)
 					}
 					c.session = sinfo
 					err = e

src/yggdrasil/session.go

@@ -416,8 +416,11 @@ func (sinfo *sessionInfo) _updateNonce(theirNonce *crypto.BoxNonce) {
 // Called after coord changes, so attemtps to use a session will trigger a new ping and notify the remote end of the coord change.
 // Only call this from the router actor.
 func (ss *sessions) reset() {
-	for _, sinfo := range ss.sinfos {
+	for _, _sinfo := range ss.sinfos {
+		sinfo := _sinfo // So we can safely put it in a closure
+		sinfo.Act(ss.router, func() {
 			sinfo.reset = true
+		})
 	}
 }
 
@@ -474,12 +477,6 @@ func (sinfo *sessionInfo) _recvPacket(p *wire_trafficPacket) {
 				util.PutBytes(bs)
 				return
 			}
-			if sinfo.conn == nil {
-				// There's no connection associated with this session for some reason
-				// TODO: Figure out why this happens sometimes, it shouldn't
-				util.PutBytes(bs)
-				return
-			}
 			sinfo._updateNonce(&p.Nonce)
 			sinfo.bytesRecvd += uint64(len(bs))
 			sinfo.conn.recvMsg(sinfo, bs)

src/yggdrasil/tcp.go

@@ -207,11 +207,12 @@ func (t *tcp) listener(l *TcpListener, listenaddr string) {
 }
 
 // Checks if we already are calling this address
-func (t *tcp) isAlreadyCalling(saddr string) bool {
+func (t *tcp) startCalling(saddr string) bool {
 	t.mutex.Lock()
 	defer t.mutex.Unlock()
 	_, isIn := t.calls[saddr]
-	return isIn
+	t.calls[saddr] = struct{}{}
+	return !isIn
 }
 
 // Checks if a connection already exists.
@@ -225,12 +226,9 @@ func (t *tcp) call(saddr string, options interface{}, sintf string) {
 		if sintf != "" {
 			callname = fmt.Sprintf("%s/%s", saddr, sintf)
 		}
-		if t.isAlreadyCalling(callname) {
+		if !t.startCalling(callname) {
 			return
 		}
-		t.mutex.Lock()
-		t.calls[callname] = struct{}{}
-		t.mutex.Unlock()
 		defer func() {
 			// Block new calls for a little while, to mitigate livelock scenarios
 			time.Sleep(default_timeout)