update session monitor

cmd/main_session.go

@@ -15,16 +15,12 @@ func init() {
 
 	registerInitFn(func() {
 		if *args.EnableMonitor {
-			monitor = session.New()
-
-			// Set session variables
-			session.ServeAddr = *args.MonitorAddr
+			monitor = session.New(*args.MonitorAddr)
 
 			// Start session monitor
 			if err := monitor.Start(); err != nil {
 				log.Fatalf("Start session monitor failed: %v", err)
 			}
-			log.Infof("Session monitor serving at %v", session.ServeAddr)
 		} else {
 			monitor = nil
 		}

component/session/server.go

@@ -20,13 +20,13 @@ const maxCompletedSessions = 100
 
 var (
 	ServeAddr = "localhost:6001"
-	ServePath = "/session/plain"
-)
-
 type Server struct {
 	sync.Mutex
 	*http.Server
 
+	ServeAddr string
+	ServePath string
+
 	trafficUp   int64
 	trafficDown int64
 
@@ -34,8 +34,11 @@ type Server struct {
 	completedSessions []Session
 }
 
-func New() *Server {
-	return &Server{}
+func New(addr string) *Server {
+	return &Server{
+		ServeAddr: addr,
+		ServePath: "/session/plain",
+	}
 }
 
 func (s *Server) handler(resp http.ResponseWriter, req *http.Request) {
@@ -122,12 +125,16 @@ table, th, td {
 }
 
 func (s *Server) Start() error {
-	_, port, err := net.SplitHostPort(ServeAddr)
+	if s.ServePath == "" || s.ServePath == "/" {
+		return errors.New("invalid serve path")
+	}
+
+	_, port, err := net.SplitHostPort(s.ServeAddr)
 	if port == "0" || port == "" || err != nil {
 		return errors.New("address format error")
 	}
 
-	tcpAddr, err := net.ResolveTCPAddr("tcp", ServeAddr)
+	tcpAddr, err := net.ResolveTCPAddr("tcp", s.ServeAddr)
 	if err != nil {
 		return err
 	}
@@ -139,10 +146,10 @@ func (s *Server) Start() error {
 
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		http.Redirect(w, r, ServePath, 301)
+		http.Redirect(w, r, s.ServePath, 301)
 	})
-	mux.HandleFunc(ServePath, s.handler)
-	s.Server = &http.Server{Addr: ServeAddr, Handler: mux}
+	mux.HandleFunc(s.ServePath, s.handler)
+	s.Server = &http.Server{Addr: s.ServeAddr, Handler: mux}
 	go func() {
 		s.Serve(c)
 	}()