func (sr Server) LoadState(key int64, sta *game.State) (err error) {
da := new(game.StateData)
if err = sr.LoadSD(key, da); err == nil {
sta.FromData(da)
}
return
}
func (sr Server) SaveState(sta *game.State) (key int64, err error) {
return sr.SaveSD(sta.Data())
}