如何从请求中读取，然后使用该结果执行POST请求，然后处理其结果

Question

I'm trying to read from request then use that result to do POST request to another endpoint then process its results then return its results in JSON.

I have below code so far:

// POST 
func (u *UserResource) authenticate(request *restful.Request, response *restful.Response) {
    Api := Api{url: "http://api.com/api"}
    usr := new(User)
    err := request.ReadEntity(&usr)
    if err != nil {
        response.WriteErrorString(http.StatusInternalServerError, err.Error())
        return
    }

    api_resp, err := http.Post(Api.url, "text/plain", bytes.NewBuffer(usr))
    if err != nil {
        response.WriteErrorString(http.StatusInternalServerError, err.Error())
        return
    }
    defer api_resp.Body.Close()
    body, err := ioutil.ReadAll(api_resp.Body)
    response.WriteHeader(http.StatusCreated)
    err = xml.Unmarshal(body, usr)
    if err != nil {
        fmt.Printf("error: %v", err)
        return
    }
//  result, err := json.Marshal(usr)
//  response.Write(result)
    response.WriteEntity(&usr)
    fmt.Printf("Name: %q
", usr.UserName)
}

I'm using Go Restful package for Writes and Reads.

I'm getting this error when I compile the file:

src\login.go:59: cannot use usr (type *User) as type []byte in argument to bytes.NewBuffer

What would be the best way to solve this issue so I can do a POST with payload correctly?

Answer 1

You need to marshal your data structure to slice of bytes. Something like this:

usrXmlBytes, err := xml.Marshal(usr)
if err != nil {
    response.WriteErrorString(http.StatusInternalServerError, err.Error())
    return
}
api_resp, err := http.Post(Api.url, "text/plain", bytes.NewReader(usrXmlBytes))