frostfs-node/pkg/local_object_storage/metabase/version.go

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package meta
import (
"encoding/binary"
"fmt"
"go.etcd.io/bbolt"
)
// version contains current metabase version.
const version = 0
var versionKey = []byte("version")
func checkVersion(tx *bbolt.Tx, initialized bool) error {
b := tx.Bucket(shardInfoBucket)
if b != nil {
data := b.Get(versionKey)
if len(data) == 8 {
stored := binary.LittleEndian.Uint64(data)
if stored != version {
return fmt.Errorf("invalid version: expected=%d, stored=%d", version, stored)
}
}
}
if !initialized { // new database, write version
return updateVersion(tx, version)
}
return nil // return error here after the first version increase
}
func updateVersion(tx *bbolt.Tx, version uint64) error {
data := make([]byte, 8)
binary.LittleEndian.PutUint64(data, version)
b, err := tx.CreateBucketIfNotExists(shardInfoBucket)
if err != nil {
return fmt.Errorf("can't create auxilliary bucket: %w", err)
}
return b.Put(versionKey, data)
}