neoneo-go/pkg/core/state/nonfungible.go

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package state
import (
"bytes"
"errors"
"math/big"
"sort"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// NFTTokenState represents state of nonfungible token.
type NFTTokenState struct {
Owner util.Uint160
Name string
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}
// NFTAccountState represents state of nonfunglible account.
type NFTAccountState struct {
NEP17BalanceState
Tokens [][]byte
}
// Base returns base class.
func (s *NFTTokenState) Base() *NFTTokenState {
return s
}
// ToStackItem converts NFTTokenState to stackitem.
func (s *NFTTokenState) ToStackItem() stackitem.Item {
owner := s.Owner
return stackitem.NewStruct([]stackitem.Item{
stackitem.NewByteArray(owner.BytesBE()),
stackitem.NewByteArray([]byte(s.Name)),
})
}
// EncodeBinary implements io.Serializable.
func (s *NFTTokenState) EncodeBinary(w *io.BinWriter) {
stackitem.EncodeBinaryStackItem(s.ToStackItem(), w)
}
// FromStackItem converts stackitem to NFTTokenState.
func (s *NFTTokenState) FromStackItem(item stackitem.Item) error {
arr, ok := item.Value().([]stackitem.Item)
if !ok || len(arr) < 2 {
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return errors.New("invalid stack item")
}
bs, err := arr[0].TryBytes()
if err != nil {
return err
}
owner, err := util.Uint160DecodeBytesBE(bs)
if err != nil {
return err
}
name, err := stackitem.ToString(arr[1])
if err != nil {
return err
}
s.Owner = owner
s.Name = name
return nil
}
// DecodeBinary implements io.Serializable.
func (s *NFTTokenState) DecodeBinary(r *io.BinReader) {
item := stackitem.DecodeBinaryStackItem(r)
if r.Err == nil {
r.Err = s.FromStackItem(item)
}
}
// ToMap converts NFTTokenState to Map stackitem.
func (s *NFTTokenState) ToMap() *stackitem.Map {
return stackitem.NewMapWithValue([]stackitem.MapElement{
{
Key: stackitem.NewByteArray([]byte("name")),
Value: stackitem.NewByteArray([]byte(s.Name)),
},
})
}
// ID returns token id.
func (s *NFTTokenState) ID() []byte {
return []byte(s.Name)
}
// ToStackItem converts NFTAccountState to stackitem.
func (s *NFTAccountState) ToStackItem() stackitem.Item {
st := s.NEP17BalanceState.toStackItem().(*stackitem.Struct)
arr := make([]stackitem.Item, len(s.Tokens))
for i := range arr {
arr[i] = stackitem.NewByteArray(s.Tokens[i])
}
st.Append(stackitem.NewArray(arr))
return st
}
// FromStackItem converts stackitem to NFTAccountState.
func (s *NFTAccountState) FromStackItem(item stackitem.Item) error {
s.NEP17BalanceState.fromStackItem(item)
arr := item.Value().([]stackitem.Item)
if len(arr) < 2 {
return errors.New("invalid stack item")
}
arr, ok := arr[1].Value().([]stackitem.Item)
if !ok {
return errors.New("invalid stack item")
}
s.Tokens = make([][]byte, len(arr))
for i := range s.Tokens {
bs, err := arr[i].TryBytes()
if err != nil {
return err
}
s.Tokens[i] = bs
}
return nil
}
// EncodeBinary implements io.Serializable.
func (s *NFTAccountState) EncodeBinary(w *io.BinWriter) {
stackitem.EncodeBinaryStackItem(s.ToStackItem(), w)
}
// DecodeBinary implements io.Serializable.
func (s *NFTAccountState) DecodeBinary(r *io.BinReader) {
item := stackitem.DecodeBinaryStackItem(r)
if r.Err == nil {
r.Err = s.FromStackItem(item)
}
}
func (s *NFTAccountState) index(tokenID []byte) (int, bool) {
lt := len(s.Tokens)
index := sort.Search(lt, func(i int) bool {
return bytes.Compare(s.Tokens[i], tokenID) >= 0
})
return index, index < lt && bytes.Equal(s.Tokens[index], tokenID)
}
// Add adds token id to the set of account tokens
// and returns true on success.
func (s *NFTAccountState) Add(tokenID []byte) bool {
index, isPresent := s.index(tokenID)
if isPresent {
return false
}
s.Balance.Add(&s.Balance, big.NewInt(1))
s.Tokens = append(s.Tokens, []byte{})
copy(s.Tokens[index+1:], s.Tokens[index:])
s.Tokens[index] = tokenID
return true
}
// Remove removes token id to the set of account tokens
// and returns true on success.
func (s *NFTAccountState) Remove(tokenID []byte) bool {
index, isPresent := s.index(tokenID)
if !isPresent {
return false
}
s.Balance.Sub(&s.Balance, big.NewInt(1))
copy(s.Tokens[index:], s.Tokens[index+1:])
s.Tokens = s.Tokens[:len(s.Tokens)-1]
return true
}