dao: use custom storage prefix

We use 2 prefixes for storing items because of state synchronization.
This commit allows to parametrize dao with the default prefix.

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>

cli/server/dump.go

@@ -32,7 +32,7 @@ func batchToMap(index uint32, batch *storage.MemBatch) blockDump {
 	ops := make([]storageOp, 0, size)
 	for i := range batch.Put {
 		key := batch.Put[i].Key
-		if len(key) == 0 || key[0] != byte(storage.STStorage) {
+		if len(key) == 0 || key[0] != byte(storage.STStorage) && key[0] != byte(storage.STTempStorage) {
 			continue
 		}
 
@@ -50,7 +50,8 @@ func batchToMap(index uint32, batch *storage.MemBatch) blockDump {
 
 	for i := range batch.Deleted {
 		key := batch.Deleted[i].Key
-		if len(key) == 0 || key[0] != byte(storage.STStorage) || !batch.Deleted[i].Exists {
+		if len(key) == 0 || !batch.Deleted[i].Exists ||
+			key[0] != byte(storage.STStorage) && key[0] != byte(storage.STTempStorage) {
 			continue
 		}
 

pkg/core/blockchain.go

@@ -490,7 +490,7 @@ func (bc *Blockchain) jumpToStateInternal(p uint32, stage stateJumpStage) error
 		// Replace old storage items by new ones, it should be done step-by step.
 		// Firstly, remove all old genesis-related items.
 		b := bc.dao.Store.Batch()
-		bc.dao.Store.Seek([]byte{byte(storage.STStorage)}, func(k, _ []byte) {
+		bc.dao.Store.Seek([]byte{byte(bc.dao.StoragePrefix)}, func(k, _ []byte) {
 			// #1468, but don't need to copy here, because it is done by Store.
 			b.Delete(k)
 		})
@@ -505,14 +505,16 @@ func (bc *Blockchain) jumpToStateInternal(p uint32, stage stateJumpStage) error
 		for {
 			count := 0
 			b := bc.dao.Store.Batch()
-			bc.dao.Store.Seek([]byte{byte(storage.STTempStorage)}, func(k, v []byte) {
+			currPrefix := byte(bc.dao.StoragePrefix)
+			syncPrefix := byte(statesync.TemporaryPrefix(bc.dao.StoragePrefix))
+			bc.dao.Store.Seek([]byte{syncPrefix}, func(k, v []byte) {
 				if count >= maxStorageBatchSize {
 					return
 				}
 				// #1468, but don't need to copy here, because it is done by Store.
 				b.Delete(k)
 				key := make([]byte, len(k))
-				key[0] = byte(storage.STStorage)
+				key[0] = currPrefix
 				copy(key[1:], k[1:])
 				b.Put(key, slice.Copy(v))
 				count += 2

pkg/core/blockchain_test.go

@@ -1765,9 +1765,13 @@ func TestBlockchain_InitWithIncompleteStateJump(t *testing.T) {
 
 	// put storage items with STTemp prefix
 	batch := bcSpout.dao.Store.Batch()
-	bcSpout.dao.Store.Seek(storage.STStorage.Bytes(), func(k, v []byte) {
+	tempPrefix := storage.STTempStorage
+	if bcSpout.dao.StoragePrefix == tempPrefix {
+		tempPrefix = storage.STStorage
+	}
+	bcSpout.dao.Store.Seek(bcSpout.dao.StoragePrefix.Bytes(), func(k, v []byte) {
 		key := slice.Copy(k)
-		key[0] = storage.STTempStorage.Bytes()[0]
+		key[0] = byte(tempPrefix)
 		value := slice.Copy(v)
 		batch.Put(key, value)
 	})

pkg/core/dao/dao.go

@@ -74,7 +74,8 @@ type DAO interface {
 
 // Simple is memCached wrapper around DB, simple DAO implementation.
 type Simple struct {
-	Store *storage.MemCachedStore
+	StoragePrefix storage.KeyPrefix
+	Store         *storage.MemCachedStore
 	// stateRootInHeader specifies if block header contains state root.
 	stateRootInHeader bool
 	// p2pSigExtensions denotes whether P2PSignatureExtensions are enabled.
@@ -84,7 +85,12 @@ type Simple struct {
 // NewSimple creates new simple dao using provided backend store.
 func NewSimple(backend storage.Store, stateRootInHeader bool, p2pSigExtensions bool) *Simple {
 	st := storage.NewMemCachedStore(backend)
-	return &Simple{Store: st, stateRootInHeader: stateRootInHeader, p2pSigExtensions: p2pSigExtensions}
+	return &Simple{
+		StoragePrefix:     storage.STStorage,
+		Store:             st,
+		stateRootInHeader: stateRootInHeader,
+		p2pSigExtensions:  p2pSigExtensions,
+	}
 }
 
 // GetBatch returns currently accumulated DB changeset.
@@ -96,6 +102,7 @@ func (dao *Simple) GetBatch() *storage.MemBatch {
 // MemCachedStore around the current DAO Store.
 func (dao *Simple) GetWrapped() DAO {
 	d := NewSimple(dao.Store, dao.stateRootInHeader, dao.p2pSigExtensions)
+	d.StoragePrefix = dao.StoragePrefix
 	return d
 }
 
@@ -277,7 +284,7 @@ func (dao *Simple) PutAppExecResult(aer *state.AppExecResult, buf *io.BufBinWrit
 
 // GetStorageItem returns StorageItem if it exists in the given store.
 func (dao *Simple) GetStorageItem(id int32, key []byte) state.StorageItem {
-	b, err := dao.Store.Get(makeStorageItemKey(id, key))
+	b, err := dao.Store.Get(makeStorageItemKey(dao.StoragePrefix, id, key))
 	if err != nil {
 		return nil
 	}
@@ -287,14 +294,14 @@ func (dao *Simple) GetStorageItem(id int32, key []byte) state.StorageItem {
 // PutStorageItem puts given StorageItem for given id with given
 // key into the given store.
 func (dao *Simple) PutStorageItem(id int32, key []byte, si state.StorageItem) error {
-	stKey := makeStorageItemKey(id, key)
+	stKey := makeStorageItemKey(dao.StoragePrefix, id, key)
 	return dao.Store.Put(stKey, si)
 }
 
 // DeleteStorageItem drops storage item for the given id with the
 // given key from the store.
 func (dao *Simple) DeleteStorageItem(id int32, key []byte) error {
-	stKey := makeStorageItemKey(id, key)
+	stKey := makeStorageItemKey(dao.StoragePrefix, id, key)
 	return dao.Store.Delete(stKey)
 }
 
@@ -323,7 +330,7 @@ func (dao *Simple) GetStorageItemsWithPrefix(id int32, prefix []byte) ([]state.S
 // Seek executes f for all items with a given prefix.
 // If key is to be used outside of f, they may not be copied.
 func (dao *Simple) Seek(id int32, prefix []byte, f func(k, v []byte)) {
-	lookupKey := makeStorageItemKey(id, nil)
+	lookupKey := makeStorageItemKey(dao.StoragePrefix, id, nil)
 	if prefix != nil {
 		lookupKey = append(lookupKey, prefix...)
 	}
@@ -335,7 +342,7 @@ func (dao *Simple) Seek(id int32, prefix []byte, f func(k, v []byte)) {
 // SeekAsync sends all storage items matching given prefix to a channel and returns
 // the channel. Resulting keys and values may not be copied.
 func (dao *Simple) SeekAsync(ctx context.Context, id int32, prefix []byte) chan storage.KeyValue {
-	lookupKey := makeStorageItemKey(id, nil)
+	lookupKey := makeStorageItemKey(dao.StoragePrefix, id, nil)
 	if prefix != nil {
 		lookupKey = append(lookupKey, prefix...)
 	}
@@ -343,10 +350,10 @@ func (dao *Simple) SeekAsync(ctx context.Context, id int32, prefix []byte) chan
 }
 
 // makeStorageItemKey returns a key used to store StorageItem in the DB.
-func makeStorageItemKey(id int32, key []byte) []byte {
+func makeStorageItemKey(prefix storage.KeyPrefix, id int32, key []byte) []byte {
 	// 1 for prefix + 4 for Uint32 + len(key) for key
 	buf := make([]byte, 5+len(key))
-	buf[0] = byte(storage.STStorage)
+	buf[0] = byte(prefix)
 	binary.LittleEndian.PutUint32(buf[1:], uint32(id))
 	copy(buf[5:], key)
 	return buf
@@ -667,7 +674,7 @@ func (dao *Simple) PersistSync() (int, error) {
 // GetMPTBatch storage changes to be applied to MPT.
 func (dao *Simple) GetMPTBatch() mpt.Batch {
 	var b mpt.Batch
-	dao.Store.MemoryStore.SeekAll([]byte{byte(storage.STStorage)}, func(k, v []byte) {
+	dao.Store.MemoryStore.SeekAll([]byte{byte(dao.StoragePrefix)}, func(k, v []byte) {
 		b.Add(k[1:], v)
 	})
 	return b

pkg/core/dao/dao_test.go

@@ -222,11 +222,16 @@ func TestMakeStorageItemKey(t *testing.T) {
 
 	expected := []byte{byte(storage.STStorage), 0, 0, 0, 0, 1, 2, 3}
 	binary.LittleEndian.PutUint32(expected[1:5], uint32(id))
-	actual := makeStorageItemKey(id, []byte{1, 2, 3})
+	actual := makeStorageItemKey(storage.STStorage, id, []byte{1, 2, 3})
 	require.Equal(t, expected, actual)
 
 	expected = expected[0:5]
-	actual = makeStorageItemKey(id, nil)
+	actual = makeStorageItemKey(storage.STStorage, id, nil)
+	require.Equal(t, expected, actual)
+
+	expected = []byte{byte(storage.STTempStorage), 0, 0, 0, 0, 1, 2, 3}
+	binary.LittleEndian.PutUint32(expected[1:5], uint32(id))
+	actual = makeStorageItemKey(storage.STTempStorage, id, []byte{1, 2, 3})
 	require.Equal(t, expected, actual)
 }
 

pkg/core/mpt/billet.go

@@ -28,7 +28,8 @@ var (
 // 3. Pair (node, path) must be restored only once. It's a duty of MPT pool to manage
 //    MPT paths in order to provide this assumption.
 type Billet struct {
-	Store *storage.MemCachedStore
+	TempStoragePrefix storage.KeyPrefix
+	Store             *storage.MemCachedStore
 
 	root            Node
 	refcountEnabled bool
@@ -38,11 +39,12 @@ type Billet struct {
 // to decouple storage errors from logic errors so that all storage errors are
 // processed during `store.Persist()` at the caller. This also has the benefit,
 // that every `Put` can be considered an atomic operation.
-func NewBillet(rootHash util.Uint256, enableRefCount bool, store *storage.MemCachedStore) *Billet {
+func NewBillet(rootHash util.Uint256, enableRefCount bool, prefix storage.KeyPrefix, store *storage.MemCachedStore) *Billet {
 	return &Billet{
-		Store:           store,
+		TempStoragePrefix: prefix,
-		root:            NewHashNode(rootHash),
+		Store:             store,
-		refcountEnabled: enableRefCount,
+		root:              NewHashNode(rootHash),
+		refcountEnabled:   enableRefCount,
 	}
 }
 
@@ -64,7 +66,7 @@ func (b *Billet) RestoreHashNode(path []byte, node Node) error {
 
 	// If it's a leaf, then put into temporary contract storage.
 	if leaf, ok := node.(*LeafNode); ok {
-		k := append([]byte{byte(storage.STTempStorage)}, fromNibbles(path)...)
+		k := append([]byte{byte(b.TempStoragePrefix)}, fromNibbles(path)...)
 		_ = b.Store.Put(k, leaf.value)
 	}
 	return nil

pkg/core/mpt/billet_test.go

@@ -32,7 +32,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 			b.Children[5] = NewExtensionNode([]byte{0x01}, NewLeafNode([]byte{0xAB, 0xDE}))
 			path := toNibbles([]byte{0xAC})
 			e := NewExtensionNode(path, NewHashNode(b.Hash()))
-			tr := NewBillet(e.Hash(), true, newTestStore())
+			tr := NewBillet(e.Hash(), true, storage.STTempStorage, newTestStore())
 			tr.root = e
 
 			// OK
@@ -61,7 +61,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 			l := NewLeafNode([]byte{0xAB, 0xCD})
 			path := toNibbles([]byte{0xAC})
 			e := NewExtensionNode(path, NewHashNode(l.Hash()))
-			tr := NewBillet(e.Hash(), true, newTestStore())
+			tr := NewBillet(e.Hash(), true, storage.STTempStorage, newTestStore())
 			tr.root = e
 
 			// OK
@@ -87,7 +87,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 			h := NewHashNode(util.Uint256{1, 2, 3})
 			path := toNibbles([]byte{0xAC})
 			e := NewExtensionNode(path, h)
-			tr := NewBillet(e.Hash(), true, newTestStore())
+			tr := NewBillet(e.Hash(), true, storage.STTempStorage, newTestStore())
 			tr.root = e
 
 			// no-op
@@ -99,7 +99,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 	t.Run("parent is Leaf", func(t *testing.T) {
 		l := NewLeafNode([]byte{0xAB, 0xCD})
 		path := []byte{}
-		tr := NewBillet(l.Hash(), true, newTestStore())
+		tr := NewBillet(l.Hash(), true, storage.STTempStorage, newTestStore())
 		tr.root = l
 
 		// Already restored => panic expected
@@ -121,7 +121,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 			b := NewBranchNode()
 			b.Children[5] = NewHashNode(l1.Hash())
 			b.Children[lastChild] = NewHashNode(l2.Hash())
-			tr := NewBillet(b.Hash(), true, newTestStore())
+			tr := NewBillet(b.Hash(), true, storage.STTempStorage, newTestStore())
 			tr.root = b
 
 			// OK
@@ -152,7 +152,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 			b := NewBranchNode()
 			b.Children[5] = NewHashNode(l1.Hash())
 			b.Children[lastChild] = NewHashNode(l2.Hash())
-			tr := NewBillet(b.Hash(), true, newTestStore())
+			tr := NewBillet(b.Hash(), true, storage.STTempStorage, newTestStore())
 			tr.root = b
 
 			// OK
@@ -179,7 +179,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 			// two same hashnodes => leaf's refcount expected to be 2 in the end.
 			b.Children[3] = NewHashNode(l.Hash())
 			b.Children[4] = NewHashNode(l.Hash())
-			tr := NewBillet(b.Hash(), true, newTestStore())
+			tr := NewBillet(b.Hash(), true, storage.STTempStorage, newTestStore())
 			tr.root = b
 
 			// OK
@@ -202,7 +202,7 @@ func TestBillet_RestoreHashNode(t *testing.T) {
 		b := NewBranchNode()
 		b.Children[3] = NewHashNode(l.Hash())
 		b.Children[4] = NewHashNode(l.Hash())
-		tr := NewBillet(b.Hash(), true, newTestStore())
+		tr := NewBillet(b.Hash(), true, storage.STTempStorage, newTestStore())
 
 		// Should fail, because if it's a hash node with non-empty path, then the node
 		// has already been collapsed.

pkg/core/mpt/trie.go

@@ -566,7 +566,7 @@ func (t *Trie) Find(prefix, from []byte, max int) ([]storage.KeyValue, error) {
 		res   []storage.KeyValue
 		count int
 	)
-	b := NewBillet(t.root.Hash(), false, t.Store)
+	b := NewBillet(t.root.Hash(), false, 0, t.Store)
 	process := func(pathToNode []byte, node Node, _ []byte) bool {
 		if leaf, ok := node.(*LeafNode); ok {
 			if from == nil || !bytes.Equal(pathToNode, from) { // (*Billet).traverse includes `from` path into result if so. Need to filter out manually.

pkg/core/statesync/module.go

@@ -165,6 +165,19 @@ func (s *Module) Init(currChainHeight uint32) error {
 	return s.defineSyncStage()
 }
 
+// TemporaryPrefix accepts current storage prefix and returns prefix
+// to use for storing intermediate items during synchronization.
+func TemporaryPrefix(currPrefix storage.KeyPrefix) storage.KeyPrefix {
+	switch currPrefix {
+	case storage.STStorage:
+		return storage.STTempStorage
+	case storage.STTempStorage:
+		return storage.STStorage
+	default:
+		panic(fmt.Sprintf("invalid storage prefix: %x", currPrefix))
+	}
+}
+
 // defineSyncStage sequentially checks and sets sync state process stage after Module
 // initialization. It also performs initialization of MPT Billet if necessary.
 func (s *Module) defineSyncStage() error {
@@ -194,7 +207,8 @@ func (s *Module) defineSyncStage() error {
 		if err != nil {
 			return fmt.Errorf("failed to get header to initialize MPT billet: %w", err)
 		}
-		s.billet = mpt.NewBillet(header.PrevStateRoot, s.bc.GetConfig().KeepOnlyLatestState, s.dao.Store)
+		s.billet = mpt.NewBillet(header.PrevStateRoot, s.bc.GetConfig().KeepOnlyLatestState,
+			TemporaryPrefix(s.dao.StoragePrefix), s.dao.Store)
 		s.log.Info("MPT billet initialized",
 			zap.Uint32("height", s.syncPoint),
 			zap.String("state root", header.PrevStateRoot.StringBE()))
@@ -466,7 +480,7 @@ func (s *Module) Traverse(root util.Uint256, process func(node mpt.Node, nodeByt
 	s.lock.RLock()
 	defer s.lock.RUnlock()
 
-	b := mpt.NewBillet(root, s.bc.GetConfig().KeepOnlyLatestState, storage.NewMemCachedStore(s.dao.Store))
+	b := mpt.NewBillet(root, s.bc.GetConfig().KeepOnlyLatestState, 0, storage.NewMemCachedStore(s.dao.Store))
 	return b.Traverse(func(pathToNode []byte, node mpt.Node, nodeBytes []byte) bool {
 		return process(node, nodeBytes)
 	}, false)

pkg/core/statesync/module_test.go

@@ -56,7 +56,8 @@ func TestModule_PR2019_discussion_r689629704(t *testing.T) {
 		dao:          dao.NewSimple(actualStorage, true, false),
 		mptpool:      NewPool(),
 	}
-	stateSync.billet = mpt.NewBillet(sr, true, actualStorage)
+	stateSync.billet = mpt.NewBillet(sr, true,
+		TemporaryPrefix(stateSync.dao.StoragePrefix), actualStorage)
 	stateSync.mptpool.Add(sr, []byte{})
 
 	// The test itself: we'll ask state sync module to restore each node exactly once.

pkg/core/statesync_test.go

@@ -421,7 +421,7 @@ func TestStateSyncModule_RestoreBasicChain(t *testing.T) {
 	// compare storage states
 	fetchStorage := func(bc *Blockchain) []storage.KeyValue {
 		var kv []storage.KeyValue
-		bc.dao.Store.Seek(storage.STStorage.Bytes(), func(k, v []byte) {
+		bc.dao.Store.Seek(bc.dao.StoragePrefix.Bytes(), func(k, v []byte) {
 			key := slice.Copy(k)
 			value := slice.Copy(v)
 			kv = append(kv, storage.KeyValue{