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storeDB.go
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storeDB.go
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package store
import (
"github.com/drep-project/DREP-Chain/common/trie"
"github.com/drep-project/DREP-Chain/crypto"
"github.com/drep-project/DREP-Chain/database"
"github.com/drep-project/DREP-Chain/database/dbinterface"
)
type StoreDB struct {
store dbinterface.KeyValueStore
cache *database.TransactionStore //数据属于storage的缓存,调用flush才会把数据写入到diskDb中
trie *trie.SecureTrie //全局状态树 临时树(临时变量)
trieDb *trie.Database //状态树存储到磁盘时,使用到的db
}
func NewStoreDB(store dbinterface.KeyValueStore, cache *database.TransactionStore, trie *trie.SecureTrie, trieDb *trie.Database) *StoreDB {
return &StoreDB{
store: store,
cache: cache,
trie: trie,
trieDb: trieDb,
}
}
func (s *StoreDB) initState() error {
var err error
s.trie, err = trie.NewSecure(crypto.Hash{}, s.trieDb)
return err
}
func (s *StoreDB) Get(key []byte) ([]byte, error) {
var value []byte
var err error
if s.cache != nil {
value, err = s.cache.Get(key)
} else {
value, err = s.trie.TryGet(key)
}
if err != nil {
return nil, err
}
return value, nil
}
func (s *StoreDB) Put(key []byte, value []byte) error {
if s.cache != nil {
return s.cache.Put(key, value)
} else {
err := s.trie.TryUpdate(key, value)
if err != nil {
return err
}
_, err = s.trie.Commit(nil)
return err
}
}
func (s *StoreDB) Delete(key []byte) error {
if s.cache != nil {
err := s.cache.Delete(key)
if err != nil {
return err
}
}
s.trie.Delete(key)
_, err := s.trie.Commit(nil)
return err
}
func (s *StoreDB) Flush() {
if s.cache != nil {
s.cache.Flush()
}
}
func (s *StoreDB) RevertState(shot *database.SnapShot) {
s.cache.RevertState(shot)
}
func (s *StoreDB) CopyState() *database.SnapShot {
return s.cache.CopyState()
}
func (s *StoreDB) getStateRoot() []byte {
return s.trie.Hash().Bytes()
}
func (s *StoreDB) RecoverTrie(root []byte) bool {
var err error
s.trie, err = trie.NewSecure(crypto.Bytes2Hash(root), s.trieDb)
if err != nil {
log.WithField("err",err).Info("new secure")
return false
}
s.cache = database.NewTransactionStore(s.trie)
return true
}