Small corrections for middle proxy connections

cli/proxy.go

 	"github.com/9seconds/mtg/obfuscated2"
 	"github.com/9seconds/mtg/proxy"
 	"github.com/9seconds/mtg/stats"
+	"github.com/9seconds/mtg/telegram"
 	"github.com/9seconds/mtg/utils"
 )
 
 	if err := stats.Init(ctx); err != nil {
 		Fatal(err)
 	}
+	telegram.MiddleInit()
+
 	proxyListener, err := net.Listen("tcp", config.C.ListenAddr.String())
 	if err != nil {
 		Fatal(err)

telegram/middle.go

 
 const middleTelegramBackgroundUpdateEvery = time.Hour
 
-var Middle = NewMiddleTelegram()
+var Middle Telegram
 
 type middleTelegram struct {
 	baseTelegram
 
-	mutex  sync.RWMutex
+	mutex sync.RWMutex
+}
+
+func (m *middleTelegram) Secret() []byte {
+	m.mutex.RLock()
+	defer m.mutex.RUnlock()
+
+	return m.baseTelegram.Secret()
 }
 
 func (m *middleTelegram) update() error {
 	return m.baseTelegram.dial(ctx, cancel, dc, protocol)
 }
 
-func NewMiddleTelegram() Telegram {
+func MiddleInit() {
 	tg := &middleTelegram{
 		baseTelegram: baseTelegram{
 			dialer: net.Dialer{Timeout: telegramDialTimeout},
 	}
 	go tg.backgroundUpdate()
 
-	return tg
+	Middle = tg
 }