CR: export error string generation to a function

server/control.go

@@ -31,6 +31,7 @@ import (
 	"github.com/fatedier/frp/server/controller"
 	"github.com/fatedier/frp/server/proxy"
 	"github.com/fatedier/frp/server/stats"
+	"github.com/fatedier/frp/utils/util"
 	"github.com/fatedier/frp/utils/version"
 	"github.com/fatedier/frp/utils/xlog"
 
@@ -438,12 +439,8 @@ func (ctl *Control) manager() {
 					ProxyName: m.ProxyName,
 				}
 				if err != nil {
-					if ctl.serverCfg.DetailedErrorsToClient {
-						resp.Error = err.Error()
-					} else {
-						resp.Error = fmt.Sprintf("new proxy [%s] error", m.ProxyName)
-					}
 					xl.Warn("new proxy [%s] error: %v", m.ProxyName, err)
+					resp.Error = util.GenerateResponseErrorString(fmt.Sprintf("new proxy [%s] error", m.ProxyName), err, ctl.serverCfg.DetailedErrorsToClient)
 				} else {
 					resp.RemoteAddr = remoteAddr
 					xl.Info("new proxy [%s] success", m.ProxyName)

server/service.go

@@ -320,13 +320,9 @@ func (svr *Service) HandleListener(l net.Listener) {
 					// Otherwise send success message in control's work goroutine.
 					if err != nil {
 						xl.Warn("register control error: %v", err)
-						errStr := "register control error"
-						if svr.cfg.DetailedErrorsToClient {
-							errStr = err.Error()
-						}
 						msg.WriteMsg(conn, &msg.LoginResp{
 							Version: version.Full(),
-							Error:   errStr,
+							Error:   util.GenerateResponseErrorString("register control error", err, svr.cfg.DetailedErrorsToClient),
 						})
 						conn.Close()
 					}
@@ -335,13 +331,9 @@ func (svr *Service) HandleListener(l net.Listener) {
 				case *msg.NewVisitorConn:
 					if err = svr.RegisterVisitorConn(conn, m); err != nil {
 						xl.Warn("register visitor conn error: %v", err)
-						errStr := "register visitor conn error"
-						if svr.cfg.DetailedErrorsToClient {
-							errStr = err.Error()
-						}
 						msg.WriteMsg(conn, &msg.NewVisitorConnResp{
 							ProxyName: m.ProxyName,
-							Error:     errStr,
+							Error:     util.GenerateResponseErrorString("register visitor conn error", err, svr.cfg.DetailedErrorsToClient),
 						})
 						conn.Close()
 					} else {

utils/util/util.go

@@ -101,3 +101,11 @@ func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
 	}
 	return
 }
+
+func GenerateResponseErrorString(summary string, err error, detailed bool) string {
+	if detailed {
+		return err.Error()
+	} else {
+		return summary
+	}
+}