func (engine *Engine) ListProducts(limit uint64, offset uint64) ([]data.Product, error) {
if limit < 1 {
return nil, ErrEmptyLimit
}
tx, err := engine.storage.Begin()
if err != nil {
return nil, err
}
products, err := tx.ListProducts(limit, offset)
if err != nil {
return nil, tx.Rollback(err)
}
for i, product := range products {
populate.Product(&product)
products[i] = product
}
if err := tx.Commit(); err != nil {
return nil, err
}
return products, nil
}
func (engine *Engine) UpdateProduct(product *data.Product) error {
if product.ID == 0 {
return ErrEmptyID
}
if !nameRegexp.MatchString(product.Name) {
return ErrInvalidName
}
if product.Price.Net < 1 {
return ErrInvalidNetPrice
}
tx, err := engine.storage.Begin()
if err != nil {
return err
}
if err := tx.UpdateProduct(product); err != nil {
return tx.Rollback(err)
}
populate.Product(product)
if err := tx.Commit(); err != nil {
return err
}
return nil
}
func (engine *Engine) LoadProduct(product *data.Product) error {
if product.ID == 0 {
return ErrEmptyID
}
tx, err := engine.storage.Begin()
if err != nil {
return err
}
if err := tx.LoadProduct(product); err != nil {
return tx.Rollback(err)
}
populate.Product(product)
if err := tx.Commit(); err != nil {
return err
}
return nil
}