fix: skip nginx reload if configuration has not changed (#2555)

framework/l4-bfl-proxy/main.go

@@ -146,6 +146,8 @@ type Server struct {
 	ngxCmd *nginx.Command
 
 	ngxTmpl *template.Template
+
+	prevNgxConf []byte
 }
 
 func (s *Server) init() error {
@@ -906,6 +908,9 @@ func (s *Server) generateStreamServers() ([]StreamServer, error) {
 			if bflHost == "" {
 				return nil, fmt.Errorf("can not find bfl service for user=%s", app.Spec.Owner)
 			}
+			if p.ExposePort < 1 || p.ExposePort > 65535 {
+				continue
+			}
 			server := StreamServer{
 				Protocol: p.Protocol,
 				Port:     p.ExposePort,
@@ -929,6 +934,13 @@ func (s *Server) renderAndReload() error {
 		return err
 	}
 	nginxConfig := buf.Bytes()
+
+	if bytes.Equal(nginxConfig, s.prevNgxConf) {
+		klog.Infof("nginx config not changed, skip reload")
+		return nil
+	}
+	s.prevNgxConf = nginxConfig
+
 	err = s.testTemplate(nginxConfig)
 	if err != nil {
 		return err