add comments

pkg/api/default.go

@@ -5,16 +5,20 @@ import (
 	"github.com/mayswind/lab/pkg/errs"
 )
 
+// DefaultApi represents default api
 type DefaultApi struct{}
 
+// Initialize a default api singleton instance
 var (
 	Default = &DefaultApi{}
 )
 
+// ApiNotFound returns api not found error
 func (a *DefaultApi) ApiNotFound(c *core.Context) (interface{}, *errs.Error) {
 	return nil, errs.ErrApiNotFound
 }
 
+// MethodNotAllowed returns method not allowed error
 func (a *DefaultApi) MethodNotAllowed(c *core.Context) (interface{}, *errs.Error) {
 	return nil, errs.ErrMethodNotAllowed
 }