golang json decode with empty request body

huangapple
go评论117阅读模式
英文:

golang json decode with empty request body

问题

在下面的HTTP处理程序中，我试图区分请求体是否为空：

  1. type Request struct {
  2.     A    bool  `json:"lala"`
  3.     B    bool  `json:"kaka"`
  4.     C    int32 `json:"cc"`
  5.     D    int32 `json:"dd"`
  6. }
  7. var (
  8.     opts    Request
  9.     hasOpts bool = true
  10. )
  11. err = json.NewDecoder(r.Body).Decode(&opts)
  12. switch {
  13. case err == io.EOF:
  14.     hasOpts = false
  15. case err != nil:
  16.     return errors.New("Could not get advanced options: " + err.Error())
  17. }

然而，即使r.Body等于'{}'，hasOpts仍然为true。这是预期的吗？如果是这样，我应该如何检测空的请求体？

英文:

In the following http handler, I try to distinguish whether the request body is empty

  1.     type Request struct {                                                       
  2.         A    bool  `json:"lala"`                               
  3.         B    bool  `json:"kaka"`                               
  4.         C    int32 `json:"cc"`                           
  5.         D    int32 `json:"dd"`                             
  6.     }                                                                           
  7.     var (                                                                       
  8.         opts    Request                                                         
  9.         hasOpts bool = true                                                     
  10.     )                                                                           
  11.     err = json.NewDecoder(r.Body).Decode(&opts)                                 
  12.     switch {                                                                    
  13.     case err == io.EOF:                                                         
  14.         hasOpts = false                                                         
  15.     case err != nil:                                                            
  16.         return errors.New("Could not get advanced options: " + err.Error()) 
  17.     }

However, even with r.Body equals '{}', hasOpts is still true. Is this to be expected? In that case, how should I detect empty request body?

答案1

得分: 5

首先，阅读请求体以检查其内容，然后对其进行解析：

  1. body, err := ioutil.ReadAll(r.Body)
  2. if err != nil {
  3.     return err
  4. }
  6. if len(body) > 0 {
  7.     err = json.Unmarshal(body, &opts)
  8.     if err != nil {
  9.         return fmt.Errorf("无法获取高级选项：%s", err)
  10.     }
  11. }
英文:

Read the body first, to check its content, then unmarshal it:

  1. body, err := ioutil.ReadAll(r.Body)
  2. if err != nil {
  3. 	return err
  4. }
  6. if len(body) > 0 {
  7. 	err = json.Unmarshal(body, &opts)
  8. 	if err != nil {
  9. 		return fmt.Errorf("Could not get advanced options: %s", err)
  10. 	}
  11. }

huangapple
  • 本文由 发表于 2017年3月16日 01:23:13
  • 转载请务必保留本文链接：https://go.coder-hub.com/42816632.html
  • go
  • http
  • http-post
  • json
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