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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