forked from TrueCloudLab/neoneo-go
84 lines
2 KiB
Go
84 lines
2 KiB
Go
package stateroot
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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"github.com/nspcc-dev/neo-go/pkg/io"
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)
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var (
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// ErrStateMismatch means that local state root doesn't match the one
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// signed by state validators.
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ErrStateMismatch = errors.New("stateroot mismatch")
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)
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const (
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prefixLocal = 0x02
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prefixValidated = 0x03
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)
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func (s *Module) addLocalStateRoot(store *storage.MemCachedStore, sr *state.MPTRoot) {
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key := makeStateRootKey(sr.Index)
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putStateRoot(store, key, sr)
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data := make([]byte, 4)
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binary.LittleEndian.PutUint32(data, sr.Index)
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store.Put([]byte{byte(storage.DataMPTAux), prefixLocal}, data)
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}
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func putStateRoot(store *storage.MemCachedStore, key []byte, sr *state.MPTRoot) {
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w := io.NewBufBinWriter()
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sr.EncodeBinary(w.BinWriter)
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store.Put(key, w.Bytes())
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}
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func (s *Module) getStateRoot(key []byte) (*state.MPTRoot, error) {
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data, err := s.Store.Get(key)
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if err != nil {
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return nil, err
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}
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sr := &state.MPTRoot{}
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r := io.NewBinReaderFromBuf(data)
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sr.DecodeBinary(r)
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return sr, r.Err
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}
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func makeStateRootKey(index uint32) []byte {
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key := make([]byte, 5)
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key[0] = byte(storage.DataMPTAux)
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binary.BigEndian.PutUint32(key[1:], index)
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return key
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}
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// AddStateRoot adds validated state root provided by network.
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func (s *Module) AddStateRoot(sr *state.MPTRoot) error {
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if err := s.VerifyStateRoot(sr); err != nil {
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return err
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}
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key := makeStateRootKey(sr.Index)
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local, err := s.getStateRoot(key)
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if err != nil {
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return err
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}
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if !local.Root.Equals(sr.Root) {
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return fmt.Errorf("%w at block %d: %v vs %v", ErrStateMismatch, sr.Index, local.Root, sr.Root)
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}
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if len(local.Witness) != 0 {
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return nil
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}
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putStateRoot(s.Store, key, sr)
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data := make([]byte, 4)
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binary.LittleEndian.PutUint32(data, sr.Index)
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s.Store.Put([]byte{byte(storage.DataMPTAux), prefixValidated}, data)
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s.validatedHeight.Store(sr.Index)
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if !s.srInHead {
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updateStateHeightMetric(sr.Index)
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}
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return nil
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}
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