fix #736 (#738)

* optimize performance

* rename

* rename

* revert

tools/goctl/api/gogen/genmain.go

@@ -39,7 +39,7 @@ func main() {
 }
 `
 
-func genMain(dir string, cfg *config.Config, api *spec.ApiSpec) error {
+func genMain(dir, rootPkg string, cfg *config.Config, api *spec.ApiSpec) error {
 	name := strings.ToLower(api.Service.Name)
 	if strings.HasSuffix(name, "-api") {
 		name = strings.ReplaceAll(name, "-api", "")
@@ -49,11 +49,6 @@ func genMain(dir string, cfg *config.Config, api *spec.ApiSpec) error {
 		return err
 	}
 
-	parentPkg, err := getParentPackage(dir)
-	if err != nil {
-		return err
-	}
-
 	return genFile(fileGenConfig{
 		dir:             dir,
 		subdir:          "",
@@ -63,7 +58,7 @@ func genMain(dir string, cfg *config.Config, api *spec.ApiSpec) error {
 		templateFile:    mainTemplateFile,
 		builtinTemplate: mainTemplate,
 		data: map[string]string{
-			"importPackages": genMainImports(parentPkg),
+			"importPackages": genMainImports(rootPkg),
 			"serviceName":    api.Service.Name,
 		},
 	})