英文:
Read multiple time a Reader
问题
我有两个使用相同的http.ResponseWriter和*http.Request的http处理程序，并且像这样读取请求体：
func Method1(w http.ResponseWriter, r *http.Request) {
var postData database.User
if err := json.NewDecoder(r.Body).Decode(&postData); err != nil {
//返回错误
}
}
func Method2(w http.ResponseWriter, r *http.Request) {
var postData database.User
//这个读取操作会产生EOF错误
if err := json.NewDecoder(r.Body).Decode(&postData); err != nil {
//返回错误
}
}
因为我需要保持这两个方法的分离，并且它们都需要读取请求体，所以（如果可能的话）有什么最好的方法可以对请求体进行Seek操作（请求体是ReadCloser，而不是Seeker）？
英文:
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
}
}
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?).
答案1
得分: 4
实际上，感谢miku，我已经发现最好的解决方案是使用TeeReader，以以下方式更改Method1：
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 {
// 返回一个错误
}
r.Body = ioutil.NopCloser(b)
}
英文:
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)
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论