I think you problem is here
jsonReservations, err :=
jsonConvert.ReservationsJson(otherReservations)
if err != nil {
rw.WriteHeader(http.StatusExpectationFailed)
fmt.Println(err)
}
Instead try this
if err != nil {
http.Error(rw, err.Error(), http.StatusExpectationFailed)
return // this is the important part
}
// do not allow execution to get to this line if err is != nil
On Thursday, 24 November 2016 11:44:13 UTC+11, gkol...@gmail.com wrote:
>
> Hey im running a go server locally using gorilla mux and net/http.
>
> For class we needed to create a room reservation system. I was testing the
> application on multiple compyters on the same network but
> when trying to create a reservation from both computer at the same time to
> test concurrency I get a multiple write headers error. This problem does
> not occur if i'm
> using the same computer but running on different browsers.
>
> It may help to know that the create button runs 2 ajax calls one to to
> /readReservationByUserId as POST and to /createReservation as POST.
>
> func GetReservationsOthers(rw http.ResponseWriter, req *http.Request) {
> abstractTdg := mappers.MapperBundle.UserMapper.UserTdg.AbstractTdg
> abstractTdg.GetConnection()
> defer abstractTdg.CloseConnection()
> defer req.Body.Close()
> req.ParseForm()
>
> roomID, err := strconv.Atoi(req.FormValue("dataRoom"))
> userID, err := strconv.Atoi(req.FormValue("userID"))
> reservationsMapper := mappers.MapperBundle.ReservationMapper
> reservations, err := reservationsMapper.GetByRoomId(roomID)
>
> otherReservations :=
> reservationsMapper.FilterOutUser(reservations, userID)
>
> if err != nil {
> rw.WriteHeader(http.StatusExpectationFailed)
> fmt.Println(err)
> }
>
> jsonReservations, err :=
> jsonConvert.ReservationsJson(otherReservations)
> if err != nil {
> rw.WriteHeader(http.StatusExpectationFailed)
> fmt.Println(err)
> }
> rw.Header().Set("Content-Type", "application/json")
> rw.Write(jsonReservations)
>
> }
>
> func CreateReservation(rw http.ResponseWriter, req *http.Request) {
> abstractTdg := mappers.MapperBundle.UserMapper.UserTdg.AbstractTdg
> abstractTdg.GetConnection()
> defer abstractTdg.CloseConnection()
> req.ParseForm()
> roomId := req.FormValue("dataRoom")
> userId := req.FormValue("userID")
> startTime := req.FormValue("startTime")
> endTime := req.FormValue("endTime")
> roomIdint, _ := strconv.Atoi(roomId)
> userIDint, _ := strconv.Atoi(userId)
> startTimeformated, _ := time.Parse("2006-01-02 15:04:05",
> startTime)
> endTimeformated, _ := time.Parse("2006-01-02 15:04:05", endTime)
> reservationMapper := mappers.MapperBundle.ReservationMapper
>
> if err := reservationMapper.Create(roomIdint, userIDint,
> startTimeformated, endTimeformated); err != nil {
> rw.WriteHeader(http.StatusExpectationFailed)
> }
>
> rw.WriteHeader(http.StatusOK)
> bytes, _ := jsonConvert.MessageJson("Success")
> rw.Write(bytes)
> }
>
>
>
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