func handleIndexPageRequest(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
// set the initial visitor info to the web site by templating
k := storage.GetVisitorInfoKey(c)
info, err := storage.GetVisitorInfo(c, k)
// ignore the NoSuchEntityError and return the default value if we don't have the entity stored yet
if err != nil && err != datastore.ErrNoSuchEntity {
log.Errorf(c, "Failed getting visitor info: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
outBuf, err := json.Marshal(info)
if err != nil {
log.Errorf(c, "Error while marshaling visitor info: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
param := struct {
VisitorInfo string
}{
string(outBuf),
}
err = xt.ExecuteTemplate(w, indexFileName, ¶m)
if err != nil {
log.Errorf(c, "Failed executing template: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func setVisitorInfo(c context.Context, w http.ResponseWriter, r *http.Request) {
dec := json.NewDecoder(r.Body)
var info storage.VisitorInfo
err := dec.Decode(&info)
if err != nil {
log.Errorf(c, "Failed decoding user request: %v", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
k := storage.GetVisitorInfoKey(c)
_, err = storage.SetVisitorInfo(c, k, &info)
if err != nil {
log.Errorf(c, "Failed setting visitor info: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
func getVisitorInfo(c context.Context, w http.ResponseWriter, r *http.Request) {
k := storage.GetVisitorInfoKey(c)
info, err := storage.GetVisitorInfo(c, k)
// ignore the NoSuchEntityError and return the default value if we don't have the entity stored yet
if err != nil && err != datastore.ErrNoSuchEntity {
log.Errorf(c, "Failed getting visitor info: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
enc := json.NewEncoder(w)
err = enc.Encode(info)
if err != nil {
log.Errorf(c, "Failed encoding json response: %v", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}