dede4fa7b1
Avoid calling Append() that will reallocate the slice, we know the length of the slice exactly.
138 lines
3.4 KiB
Go
138 lines
3.4 KiB
Go
package state
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import (
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"crypto/elliptic"
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"errors"
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"fmt"
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"math/big"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// NEP17Balance represents balance state of a NEP17-token.
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type NEP17Balance struct {
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Balance big.Int
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}
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// NEOBalance represents balance state of a NEO-token.
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type NEOBalance struct {
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NEP17Balance
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BalanceHeight uint32
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VoteTo *keys.PublicKey
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}
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// NEP17BalanceFromBytes converts serialized NEP17Balance to structure.
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func NEP17BalanceFromBytes(b []byte) (*NEP17Balance, error) {
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balance := new(NEP17Balance)
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err := balanceFromBytes(b, balance)
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if err != nil {
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return nil, err
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}
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return balance, nil
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}
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// Bytes returns serialized NEP17Balance.
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func (s *NEP17Balance) Bytes() []byte {
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return balanceToBytes(s)
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}
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func balanceFromBytes(b []byte, item stackitem.Convertible) error {
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if len(b) == 0 {
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return nil
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}
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return stackitem.DeserializeConvertible(b, item)
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}
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func balanceToBytes(item stackitem.Convertible) []byte {
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data, err := stackitem.SerializeConvertible(item)
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if err != nil {
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panic(err)
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}
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return data
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}
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// ToStackItem implements stackitem.Convertible. It never returns an error.
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func (s *NEP17Balance) ToStackItem() (stackitem.Item, error) {
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return stackitem.NewStruct([]stackitem.Item{stackitem.NewBigInteger(&s.Balance)}), nil
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}
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// FromStackItem implements stackitem.Convertible.
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func (s *NEP17Balance) FromStackItem(item stackitem.Item) error {
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items, ok := item.Value().([]stackitem.Item)
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if !ok {
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return errors.New("not a struct")
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}
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if len(items) < 1 {
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return errors.New("no balance value")
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}
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balance, err := items[0].TryInteger()
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if err != nil {
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return fmt.Errorf("invalid balance: %w", err)
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}
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s.Balance = *balance
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return nil
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}
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// NEOBalanceFromBytes converts serialized NEOBalance to structure.
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func NEOBalanceFromBytes(b []byte) (*NEOBalance, error) {
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balance := new(NEOBalance)
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err := balanceFromBytes(b, balance)
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if err != nil {
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return nil, err
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}
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return balance, nil
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}
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// Bytes returns serialized NEOBalance.
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func (s *NEOBalance) Bytes() []byte {
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return balanceToBytes(s)
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}
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// ToStackItem implements stackitem.Convertible interface. It never returns an error.
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func (s *NEOBalance) ToStackItem() (stackitem.Item, error) {
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var voteItem stackitem.Item
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if s.VoteTo != nil {
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voteItem = stackitem.NewByteArray(s.VoteTo.Bytes())
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} else {
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voteItem = stackitem.Null{}
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}
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return stackitem.NewStruct([]stackitem.Item{
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stackitem.NewBigInteger(&s.Balance),
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stackitem.NewBigInteger(big.NewInt(int64(s.BalanceHeight))),
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voteItem,
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}), nil
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}
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// FromStackItem converts stackitem.Item to NEOBalance.
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func (s *NEOBalance) FromStackItem(item stackitem.Item) error {
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structItem, ok := item.Value().([]stackitem.Item)
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if !ok || len(structItem) < 3 {
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return errors.New("invalid stackitem length")
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}
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balance, err := structItem[0].TryInteger()
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if err != nil {
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return fmt.Errorf("invalid balance stackitem: %w", err)
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}
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s.Balance = *balance
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h, err := structItem[1].TryInteger()
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if err != nil {
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return fmt.Errorf("invalid heigh stackitem")
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}
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s.BalanceHeight = uint32(h.Int64())
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if _, ok := structItem[2].(stackitem.Null); ok {
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s.VoteTo = nil
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return nil
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}
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bs, err := structItem[2].TryBytes()
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if err != nil {
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return fmt.Errorf("invalid public key stackitem: %w", err)
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}
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pub, err := keys.NewPublicKeyFromBytes(bs, elliptic.P256())
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if err != nil {
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return fmt.Errorf("invalid public key bytes: %w", err)
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}
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s.VoteTo = pub
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return nil
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}
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