server/proxy: simplify the code (#3488)

server/proxy/xtcp.go

@@ -16,14 +16,18 @@ package proxy
 
 import (
 	"fmt"
+	"reflect"
 
 	"github.com/fatedier/golib/errors"
-	"golang.org/x/time/rate"
 
 	"github.com/fatedier/frp/pkg/config"
 	"github.com/fatedier/frp/pkg/msg"
 )
 
+func init() {
+	RegisterProxyFactory(reflect.TypeOf(&config.XTCPProxyConf{}), NewXTCPProxy)
+}
+
 type XTCPProxy struct {
 	*BaseProxy
 	cfg *config.XTCPProxyConf
@@ -31,6 +35,17 @@ type XTCPProxy struct {
 	closeCh chan struct{}
 }
 
+func NewXTCPProxy(baseProxy *BaseProxy, cfg config.ProxyConf) Proxy {
+	unwrapped, ok := cfg.(*config.XTCPProxyConf)
+	if !ok {
+		return nil
+	}
+	return &XTCPProxy{
+		BaseProxy: baseProxy,
+		cfg:       unwrapped,
+	}
+}
+
 func (pxy *XTCPProxy) Run() (remoteAddr string, err error) {
 	xl := pxy.xl
 
@@ -72,10 +87,6 @@ func (pxy *XTCPProxy) GetConf() config.ProxyConf {
 	return pxy.cfg
 }
 
-func (pxy *XTCPProxy) GetLimiter() *rate.Limiter {
-	return pxy.limiter
-}
-
 func (pxy *XTCPProxy) Close() {
 	pxy.BaseProxy.Close()
 	pxy.rc.NatHoleController.CloseClient(pxy.GetName())