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response.go
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response.go
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package handler
import (
"bytes"
"encoding/json"
"log"
"net/http"
)
type ResponseErrView interface {
Error400() ([]byte, error)
Error500() ([]byte, error)
}
type Response struct {
errView ResponseErrView
}
func NewResponse(errView ResponseErrView) *Response {
return &Response{
errView: errView,
}
}
// Json should be used any time you want to communicate
// data back to a foreign client
func (s *Response) Json(res http.ResponseWriter, data []byte) {
res.Header().Set("Content-Type", "application/json")
res.Header().Set("Vary", "Accept-Encoding")
_, err := res.Write(data)
if err != nil {
log.Println("Error writing to response in sendData")
}
}
func (s *Response) FmtJSON(data ...json.RawMessage) ([]byte, error) {
var msg []json.RawMessage
for _, d := range data {
msg = append(msg, d)
}
resp := map[string][]json.RawMessage{
"data": msg,
}
var buf = &bytes.Buffer{}
enc := json.NewEncoder(buf)
err := enc.Encode(resp)
if err != nil {
log.Println("Failed to encode data to JSON:", err)
return nil, err
}
return buf.Bytes(), nil
}
func (s *Response) err400(res http.ResponseWriter) error {
res.WriteHeader(http.StatusBadRequest)
errView, err := s.errView.Error400()
if err != nil {
return err
}
_, err = res.Write(errView)
if err != nil {
return err
}
return nil
}
func (s *Response) err500(res http.ResponseWriter) error {
res.WriteHeader(http.StatusInternalServerError)
errView, err := s.errView.Error500()
if err != nil {
return err
}
_, err = res.Write(errView)
if err != nil {
return err
}
return nil
}