多次阅读阅读器 [英] Read multiple time a Reader

问题描述

我有两个使用相同http.ResponseWriter和* http.Request的http处理程序，并像这样读取请求正文:

I have two http handlers that use the same http.ResponseWriter and *http.Request and read the request body like this:

func Method1 (w http.ResponseWriter, r *http.Request){
    var postData database.User
    if err := json.NewDecoder(r.Body).Decode(&postData); err != nil {
      //return error
    }
}

func Method2 (w http.ResponseWriter, r *http.Request){
    var postData database.User
    //this read gives (of course) EOF error
    if err := json.NewDecoder(r.Body).Decode(&postData); err != nil {
      //return error
    }
}

因为我需要将这两个方法分开，并且它们两个都需要读取请求主体，所以这是寻求请求主体(这是ReadCloser而不是Seeker的最佳方法)(如果可能的话)?).

Because of I need to keep these 2 methods separated, and both of them need to read the request Body, which is the best way (if it's possible) to Seek the request body (which is a ReadCloser, not a Seeker?).

推荐答案

实际上，感谢miku，我发现最好的解决方案是使用TeeReader，以这种方式更改Method1

Actually, thanks to miku, I've found out that the best solution is using a TeeReader, changing Method1 in this way

func Method1 (w http.ResponseWriter, r *http.Request){
    b := bytes.NewBuffer(make([]byte, 0))
    reader := io.TeeReader(r.Body, b)

    var postData MyStruct
    if err := json.NewDecoder(reader).Decode(&postData); err != nil {
        //return an error
    }

    r.Body = ioutil.NopCloser(b)
}

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