Wrapper Caching

service.go

func (wrapper *ServiceWrapper) GetProductStock(id int) (stock int, err error) {
  key := fmt.Sprintf("key-%d", id)
  value, err := wrapper.cache.Get(key)
  if err == nil && value != "" {
    stock, _ = strconv.Atoi(value)
    return
  }
  
  defer func () {
    _ = wrapper.cache.Set(key, strconv.Itoa(stock))
  } ()
  
  stock, err = wrapper.service.GetProductStock(id)
  return
}