Use nil better to len for goleveldb.Get return

[bytom/bytom.git] / blockchain / txdb / snapshot.go

diff --git a/blockchain/txdb/snapshot.go b/blockchain/txdb/snapshot.go
index 3a1cfdf..ae85259 100644 (file)
--- a/blockchain/txdb/snapshot.go
+++ b/blockchain/txdb/snapshot.go
@@ -71,7 +71,7 @@ func (bsj SnapshotHeightJSON) Save(db dbm.DB) {
 
 func LoadSnapshotHeightJSON(db dbm.DB) SnapshotHeightJSON {
        bytes := db.Get(latestSnapshotHeight)
-       if len(bytes) == 0 {
+       if bytes == nil {
                return SnapshotHeightJSON{
                        Height: 0,
                }
@@ -120,7 +120,7 @@ func storeStateSnapshot(ctx context.Context, db dbm.DB, snapshot *state.Snapshot
 func getStateSnapshot(ctx context.Context, db dbm.DB) (*state.Snapshot, uint64, error) {
        height := LoadSnapshotHeightJSON(db).Height
        data := db.Get(calcSnapshotKey(height))
-       if len(data) == 0 {
+       if data == nil {
                return nil, height, errors.New("no this snapshot.")
        }
 
@@ -135,7 +135,7 @@ func getStateSnapshot(ctx context.Context, db dbm.DB) (*state.Snapshot, uint64,
 // provided height.
 func getRawSnapshot(ctx context.Context, db dbm.DB, height uint64) (data []byte, err error) {
        bytez := db.Get(calcSnapshotKey(height))
-       if len(bytez) == 0 {
+       if bytez == nil {
                return nil, errors.New("no this height snapshot.")
        }
        return bytez, nil