neoneo-go/pkg/core/state/native_state.go
2020-08-06 20:39:13 +03:00

140 lines
3.4 KiB
Go

package state
import (
"crypto/elliptic"
"math/big"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// NEP5BalanceState represents balance state of a NEP5-token.
type NEP5BalanceState struct {
Balance big.Int
}
// NEOBalanceState represents balance state of a NEO-token.
type NEOBalanceState struct {
NEP5BalanceState
BalanceHeight uint32
VoteTo *keys.PublicKey
}
// NEP5BalanceStateFromBytes converts serialized NEP5BalanceState to structure.
func NEP5BalanceStateFromBytes(b []byte) (*NEP5BalanceState, error) {
balance := new(NEP5BalanceState)
if len(b) == 0 {
return balance, nil
}
r := io.NewBinReaderFromBuf(b)
balance.DecodeBinary(r)
if r.Err != nil {
return nil, r.Err
}
return balance, nil
}
// Bytes returns serialized NEP5BalanceState.
func (s *NEP5BalanceState) Bytes() []byte {
w := io.NewBufBinWriter()
s.EncodeBinary(w.BinWriter)
if w.Err != nil {
panic(w.Err)
}
return w.Bytes()
}
func (s *NEP5BalanceState) toStackItem() stackitem.Item {
return stackitem.NewStruct([]stackitem.Item{stackitem.NewBigInteger(&s.Balance)})
}
func (s *NEP5BalanceState) fromStackItem(item stackitem.Item) {
s.Balance = *item.(*stackitem.Struct).Value().([]stackitem.Item)[0].Value().(*big.Int)
}
// EncodeBinary implements io.Serializable interface.
func (s *NEP5BalanceState) EncodeBinary(w *io.BinWriter) {
si := s.toStackItem()
stackitem.EncodeBinaryStackItem(si, w)
}
// DecodeBinary implements io.Serializable interface.
func (s *NEP5BalanceState) DecodeBinary(r *io.BinReader) {
si := stackitem.DecodeBinaryStackItem(r)
if r.Err != nil {
return
}
s.fromStackItem(si)
}
// NEOBalanceStateFromBytes converts serialized NEOBalanceState to structure.
func NEOBalanceStateFromBytes(b []byte) (*NEOBalanceState, error) {
balance := new(NEOBalanceState)
if len(b) == 0 {
return balance, nil
}
r := io.NewBinReaderFromBuf(b)
balance.DecodeBinary(r)
if r.Err != nil {
return nil, r.Err
}
return balance, nil
}
// Bytes returns serialized NEOBalanceState.
func (s *NEOBalanceState) Bytes() []byte {
w := io.NewBufBinWriter()
s.EncodeBinary(w.BinWriter)
if w.Err != nil {
panic(w.Err)
}
return w.Bytes()
}
// EncodeBinary implements io.Serializable interface.
func (s *NEOBalanceState) EncodeBinary(w *io.BinWriter) {
si := s.toStackItem()
stackitem.EncodeBinaryStackItem(si, w)
}
// DecodeBinary implements io.Serializable interface.
func (s *NEOBalanceState) DecodeBinary(r *io.BinReader) {
si := stackitem.DecodeBinaryStackItem(r)
if r.Err != nil {
return
}
r.Err = s.fromStackItem(si)
}
func (s *NEOBalanceState) toStackItem() stackitem.Item {
result := s.NEP5BalanceState.toStackItem().(*stackitem.Struct)
result.Append(stackitem.NewBigInteger(big.NewInt(int64(s.BalanceHeight))))
if s.VoteTo != nil {
result.Append(stackitem.NewByteArray(s.VoteTo.Bytes()))
} else {
result.Append(stackitem.Null{})
}
return result
}
func (s *NEOBalanceState) fromStackItem(item stackitem.Item) error {
structItem := item.Value().([]stackitem.Item)
s.Balance = *structItem[0].Value().(*big.Int)
s.BalanceHeight = uint32(structItem[1].Value().(*big.Int).Int64())
if _, ok := structItem[2].(stackitem.Null); ok {
s.VoteTo = nil
return nil
}
bs, err := structItem[2].TryBytes()
if err != nil {
return err
}
pub, err := keys.NewPublicKeyFromBytes(bs, elliptic.P256())
if err != nil {
return err
}
s.VoteTo = pub
return nil
}