frostfs-node/pkg/local_object_storage/metabase/version.go
Evgenii Stratonikov 73f8bb3e5f [#1523] shard: Store generic storage ID in metabase
Allow to extend blobstor with more storage sub-systems. Currently
objects stored in the FSTree have empty byte slice descriptor and object
from blobovnicza tree have the same id as earlier. Each such change in
the identifier formation should be accompanied with metabase version
increase.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2022-08-22 13:14:19 +03:00

41 lines
955 B
Go

package meta
import (
"encoding/binary"
"fmt"
"go.etcd.io/bbolt"
)
// version contains current metabase version.
const version = 1
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)
}