package state import ( "errors" "fmt" "math" "math/big" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" ) // Deposit represents GAS deposit from a Notary contract. type Deposit struct { Amount *big.Int Till uint32 } // ToStackItem implements stackitem.Convertible interface. It never returns an // error. func (d *Deposit) ToStackItem() (stackitem.Item, error) { return stackitem.NewStruct([]stackitem.Item{ stackitem.NewBigInteger(d.Amount), stackitem.Make(d.Till), }), nil } // FromStackItem implements stackitem.Convertible interface. func (d *Deposit) FromStackItem(it stackitem.Item) error { items, ok := it.Value().([]stackitem.Item) if !ok { return errors.New("not a struct") } if len(items) != 2 { return errors.New("wrong number of elements") } amount, err := items[0].TryInteger() if err != nil { return fmt.Errorf("invalid amount: %w", err) } till, err := items[1].TryInteger() if err != nil { return fmt.Errorf("invalid till: %w", err) } tiu64 := till.Uint64() if !till.IsUint64() || tiu64 > math.MaxUint32 { return errors.New("wrong till value") } d.Amount = amount d.Till = uint32(tiu64) return nil }