leveldb: report not found entry

weed/filer/leveldb/leveldb_store_kv.go

@@ -3,6 +3,8 @@ package leveldb
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/syndtr/goleveldb/leveldb"
 )
 
 func (store *LevelDBStore) KvPut(ctx context.Context, key []byte, value []byte) (err error) {
@@ -20,6 +22,10 @@ func (store *LevelDBStore) KvGet(ctx context.Context, key []byte) (value []byte,
 
 	value, err = store.db.Get(key, nil)
 
+	if err == leveldb.ErrNotFound {
+		return nil, filer.ErrKvNotFound
+	}
+
 	if err != nil {
 		return nil, fmt.Errorf("kv get: %v", err)
 	}