server/proxy: simplify the code (#3488)

server/proxy/sudp.go

@@ -15,16 +15,31 @@
 package proxy
 
 import (
-	"golang.org/x/time/rate"
+	"reflect"
 
 	"github.com/fatedier/frp/pkg/config"
 )
 
+func init() {
+	RegisterProxyFactory(reflect.TypeOf(&config.SUDPProxyConf{}), NewSUDPProxy)
+}
+
 type SUDPProxy struct {
 	*BaseProxy
 	cfg *config.SUDPProxyConf
 }
 
+func NewSUDPProxy(baseProxy *BaseProxy, cfg config.ProxyConf) Proxy {
+	unwrapped, ok := cfg.(*config.SUDPProxyConf)
+	if !ok {
+		return nil
+	}
+	return &SUDPProxy{
+		BaseProxy: baseProxy,
+		cfg:       unwrapped,
+	}
+}
+
 func (pxy *SUDPProxy) Run() (remoteAddr string, err error) {
 	xl := pxy.xl
 	allowUsers := pxy.cfg.AllowUsers
@@ -40,7 +55,7 @@ func (pxy *SUDPProxy) Run() (remoteAddr string, err error) {
 	pxy.listeners = append(pxy.listeners, listener)
 	xl.Info("sudp proxy custom listen success")
 
-	pxy.startListenHandler(pxy, HandleUserTCPConnection)
+	pxy.startCommonTCPListenersHandler()
 	return
 }
 
@@ -48,10 +63,6 @@ func (pxy *SUDPProxy) GetConf() config.ProxyConf {
 	return pxy.cfg
 }
 
-func (pxy *SUDPProxy) GetLimiter() *rate.Limiter {
-	return pxy.limiter
-}
-
 func (pxy *SUDPProxy) Close() {
 	pxy.BaseProxy.Close()
 	pxy.rc.VisitorManager.CloseListener(pxy.GetName())