103 lines
2.5 KiB
Go
103 lines
2.5 KiB
Go
package core
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import (
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"fmt"
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"github.com/CityOfZion/neo-go/pkg/core/storage"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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)
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// SpentCoins is mapping between transactions and their spent
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// coin state.
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type SpentCoins map[util.Uint256]*SpentCoinState
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func (s SpentCoins) getAndUpdate(store storage.Store, hash util.Uint256) (*SpentCoinState, error) {
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if spent, ok := s[hash]; ok {
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return spent, nil
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}
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spent := &SpentCoinState{}
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key := storage.AppendPrefix(storage.STSpentCoin, hash.BytesLE())
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if b, err := store.Get(key); err == nil {
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r := io.NewBinReaderFromBuf(b)
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spent.DecodeBinary(r)
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if r.Err != nil {
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return nil, fmt.Errorf("failed to decode (UnspentCoinState): %s", r.Err)
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}
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} else {
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spent = &SpentCoinState{
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items: make(map[uint16]uint32),
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}
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}
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s[hash] = spent
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return spent, nil
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}
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// putSpentCoinStateIntoStore puts given SpentCoinState into the given store.
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func putSpentCoinStateIntoStore(store storage.Store, hash util.Uint256, scs *SpentCoinState) error {
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buf := io.NewBufBinWriter()
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scs.EncodeBinary(buf.BinWriter)
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if buf.Err != nil {
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return buf.Err
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}
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key := storage.AppendPrefix(storage.STSpentCoin, hash.BytesLE())
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return store.Put(key, buf.Bytes())
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}
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func (s SpentCoins) commit(store storage.Store) error {
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for hash, state := range s {
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if err := putSpentCoinStateIntoStore(store, hash, state); err != nil {
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return err
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}
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}
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return nil
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}
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// SpentCoinState represents the state of a spent coin.
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type SpentCoinState struct {
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txHash util.Uint256
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txHeight uint32
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// A mapping between the index of the prevIndex and block height.
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items map[uint16]uint32
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}
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// NewSpentCoinState returns a new SpentCoinState object.
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func NewSpentCoinState(hash util.Uint256, height uint32) *SpentCoinState {
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return &SpentCoinState{
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txHash: hash,
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txHeight: height,
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items: make(map[uint16]uint32),
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}
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}
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// DecodeBinary implements Serializable interface.
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func (s *SpentCoinState) DecodeBinary(br *io.BinReader) {
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br.ReadLE(&s.txHash)
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br.ReadLE(&s.txHeight)
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s.items = make(map[uint16]uint32)
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lenItems := br.ReadVarUint()
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for i := 0; i < int(lenItems); i++ {
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var (
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key uint16
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value uint32
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)
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br.ReadLE(&key)
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br.ReadLE(&value)
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s.items[key] = value
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}
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}
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// EncodeBinary implements Serializable interface.
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func (s *SpentCoinState) EncodeBinary(bw *io.BinWriter) {
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bw.WriteBytes(s.txHash[:])
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bw.WriteLE(s.txHeight)
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bw.WriteVarUint(uint64(len(s.items)))
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for k, v := range s.items {
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bw.WriteLE(k)
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bw.WriteLE(v)
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}
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}
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