fix(p2p): tcp conn early close

gold/p2p/tcp/pdu.go

@@ -88,11 +88,11 @@ func (p *packet) WriteTo(w io.Writer) (n int64, err error) {
 	return io.Copy(w, &buf)
 }
 
-func isvalid(tcpconn *net.TCPConn) (issub, ok bool) {
+func isvalid(tcpconn *net.TCPConn, timeout time.Duration) (issub, ok bool) {
 	pckt := packet{}
 
 	stopch := make(chan struct{})
-	t := time.AfterFunc(time.Second, func() {
+	t := time.AfterFunc(timeout, func() {
 		stopch <- struct{}{}
 	})
 

gold/p2p/tcp/tcp.go

@@ -158,8 +158,14 @@ func (conn *Conn) receive(tcpconn *net.TCPConn, hasvalidated bool) {
 
 	issub, ok := false, false
 
+	peerstimeout := conn.addr.peerstimeout
+	if peerstimeout < time.Second*30 {
+		peerstimeout = time.Second * 30
+	}
+	peerstimeout *= 2
+
 	if !hasvalidated {
-		issub, ok = isvalid(tcpconn)
+		issub, ok = isvalid(tcpconn, peerstimeout)
 		if !ok {
 			return
 		}
@@ -175,11 +181,6 @@ func (conn *Conn) receive(tcpconn *net.TCPConn, hasvalidated bool) {
 		}
 	}
 
-	peerstimeout := conn.addr.peerstimeout
-	if peerstimeout < time.Second*30 {
-		peerstimeout = time.Second * 30
-	}
-	peerstimeout *= 2
 	if issub {
 		defer conn.peers.Delete(ep.String())
 	} else {
@@ -233,12 +234,17 @@ func (conn *Conn) receive(tcpconn *net.TCPConn, hasvalidated bool) {
 			t.Stop()
 		}
 
+		if conn.addr == nil || conn.lstn == nil || conn.peers == nil || conn.recv == nil {
+			return
+		}
+
 		if err != nil {
 			if config.ShowDebugLog {
 				logrus.Debugln("[tcp] recv from", ep, "err:", err)
 			}
-			_ = tcpconn.CloseRead()
-			return
+			// _ = tcpconn.CloseRead()
+			// return
+			continue
 		}
 		if r.pckt.typ >= packetTypeTop {
 			if config.ShowDebugLog {
@@ -364,7 +370,7 @@ RECONNECT:
 			dialtimeout = time.Second
 		}
 		if config.ShowDebugLog {
-			logrus.Debugln("[tcp] dial to", tcpep.addr, "timeout", dialtimeout)
+			logrus.Debugln("[tcp] dial to", tcpep.addr, "timeout", dialtimeout, "issub", issub)
 		}
 		var cn net.Conn
 		// must use another port to send because there's no exsiting conn
@@ -385,12 +391,12 @@ RECONNECT:
 		_, err = io.Copy(tcpconn, pkt)
 		if err != nil {
 			if config.ShowDebugLog {
-				logrus.Debugln("[tcp] dial to", tcpep.addr, "success, but write err:", err)
+				logrus.Debugln("[tcp] dial to", tcpep.addr, "issub", issub, "success, but write err:", err)
 			}
 			return 0, err
 		}
 		if config.ShowDebugLog {
-			logrus.Debugln("[tcp] dial to", tcpep.addr, "success, local:", tcpconn.LocalAddr())
+			logrus.Debugln("[tcp] dial to", tcpep.addr, "success, local:", tcpconn.LocalAddr(), "issub", issub)
 		}
 		if !issub {
 			conn.peers.Set(tcpep.String(), tcpconn)
@@ -398,8 +404,8 @@ RECONNECT:
 			conn.sblk.Lock()
 			conn.subs = append(conn.subs, &subconn{conn: tcpconn})
 			conn.sblk.Unlock()
-			go conn.receive(tcpconn, true)
 		}
+		go conn.receive(tcpconn, true)
 	} else if config.ShowDebugLog {
 		logrus.Debugln("[tcp] reuse tcpconn from", tcpconn.LocalAddr(), "to", tcpconn.RemoteAddr())
 	}
@@ -422,6 +428,7 @@ RECONNECT:
 			conn.sblk.Unlock()
 		}
 		if !retried {
+			logrus.Warnln("[tcp] reconnect due to write to", tcpconn.RemoteAddr(), "err:", err)
 			retried = true
 			tcpconn = nil
 			goto RECONNECT
@@ -442,6 +449,7 @@ func (conn *Conn) WriteToPeer(b []byte, ep p2p.EndPoint) (n int, err error) {
 		return 0, errors.New("data size " + strconv.Itoa(len(b)) + " is too large")
 	}
 	if !conn.suberr && !conn.cplk.TryLock() {
+		logrus.Infoln("[tcp] try sub write")
 		n, err = conn.writeToPeer(b, tcpep, true) // try sub write
 		if err == nil {
 			return