// initialize and setup cleanup
store := xormstore.New(engine, []byte("secret"))
// db cleanup every hour
// close quit channel to stop cleanup
quit := make(chan struct{})
go store.PeriodicCleanup(1*time.Hour, quit)

// in HTTP handler
func handlerFunc(w http.ResponseWriter, r *http.Request) {
  session, err := store.Get(r, "session")
  session.Values["user_id"] = 123
  store.Save(r, w, session)
  http.Error(w, "", http.StatusOK)
}