tun2: move pingloop into a function

lib/tun2/server.go

@@ -156,52 +156,56 @@ func (s *Server) ListenAndServe() error {
 	go func() {
 		for {
 			time.Sleep(5 * time.Second)
-
-			s.connlock.Lock()
-
-			for _, c := range s.conns {
-				c.session.SetDeadline(time.Now().Add(time.Second))
-
-				req, err := http.NewRequest("GET", "http://backend/health", nil)
-				if err != nil {
-					panic(err)
-				}
-
-				stream, err := c.session.OpenStream()
-				if err != nil {
-					ln.Error(err, c.F())
-					c.cancel()
-					continue
-				}
-
-				err = req.Write(stream)
-				if err != nil {
-					ln.Error(err, c.F())
-					c.cancel()
-					continue
-				}
-
-				_, err = stream.Read(make([]byte, 30))
-				if err != nil {
-					ln.Error(err, c.F())
-					c.cancel()
-					continue
-				}
-
-				stream.Close()
-
-				ln.Log(ln.F{
-					"action": "ping_health_is_good",
-				}, c.F())
-			}
-
-			s.connlock.Unlock()
+			s.pingLoopInner()
 		}
 	}()
 
 	return nil
 }
 
+func (s *Server) pingLoopInner() {
+	s.connlock.Lock()
+	defer s.connlock.Unlock()
+
+	for _, c := range s.conns {
+		c.session.SetDeadline(time.Now().Add(time.Second))
+
+		req, err := http.NewRequest("GET", "http://backend/health", nil)
+		if err != nil {
+			panic(err)
+		}
+
+		stream, err := c.session.OpenStream()
+		if err != nil {
+			ln.Error(err, c.F())
+			c.cancel()
+			return
+		}
+
+		err = req.Write(stream)
+		if err != nil {
+			ln.Error(err, c.F())
+			c.cancel()
+			return
+		}
+
+		_, err = stream.Read(make([]byte, 30))
+		if err != nil {
+			ln.Error(err, c.F())
+			c.cancel()
+			return
+		}
+
+		stream.Close()
+
+		/*
+			ln.Log(ln.F{
+				"action": "ping_health_is_good",
+			}, c.F())
+		*/
+	}
+}
+
 func (s *Server) HandleConn(c net.Conn, isKCP bool) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -381,7 +385,7 @@ func (s *Server) RoundTrip(req *http.Request) (*http.Response, error) {
 				Request:       req,
 			}
 
-			return resp, nil
+			return resp, errors.New("no backend connected")
 		}
 	}