traefik/pkg/tcp/switcher.go

package tcp

import (
	"net"

	"github.com/containous/traefik/v2/pkg/safe"
)

// HandlerSwitcher is a TCP handler switcher
type HandlerSwitcher struct {
	router safe.Safe
}

// ServeTCP forwards the TCP connection to the current active handler
func (s *HandlerSwitcher) ServeTCP(conn net.Conn) {
	handler := s.router.Get()
	h, ok := handler.(Handler)
	if ok {
		h.ServeTCP(conn)
	} else {
		conn.Close()
	}
}

// Switch sets the new TCP handler to use for new connections
func (s *HandlerSwitcher) Switch(handler Handler) {
	s.router.Set(handler)
}