decodeAPIResponse 的封装和使用

// decodeAPIResponse decode response and return slice of bytes if debug enabled.
// If debug disabled, just decode http.Response.Body stream to APIResponse struct
// for efficient memory usage
func (bot *BotAPI) decodeAPIResponse(responseBody io.Reader, resp *APIResponse) ([]byte, error) {
   if !bot.Debug {
      dec := json.NewDecoder(responseBody)
      err := dec.Decode(resp)
      return nil, err
   }

   // if debug, read response body
   data, err := ioutil.ReadAll(responseBody)
   if err != nil {
      return nil, err
   }

   err = json.Unmarshal(data, resp)
   if err != nil {
      return nil, err
   }

   return data, nil
}

var apiResp APIResponse
bytes, err := bot.decodeAPIResponse(resp.Body, &apiResp)
if err != nil {
  return &apiResp, err
}