49 lines
962 B
Go
49 lines
962 B
Go
package lmdb
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
|
|
"github.com/PowerDNS/lmdb-go/lmdb"
|
|
)
|
|
|
|
const (
|
|
DB_VERSION byte = 'v'
|
|
)
|
|
|
|
func (b *LMDBBackend) runMigrations() error {
|
|
return b.lmdbEnv.Update(func(txn *lmdb.Txn) error {
|
|
var version uint16
|
|
v, err := txn.Get(b.settingsStore, []byte{DB_VERSION})
|
|
if err != nil {
|
|
if lmdb.IsNotFound(err) {
|
|
version = 0
|
|
} else if v == nil {
|
|
return fmt.Errorf("failed to read database version: %w", err)
|
|
}
|
|
} else {
|
|
version = binary.BigEndian.Uint16(v)
|
|
}
|
|
|
|
// do the migrations in increasing steps (there is no rollback)
|
|
//
|
|
|
|
// this is when we reindex everything
|
|
if version < 1 {
|
|
}
|
|
|
|
// bump version
|
|
// if err := b.setVersion(txn, 1); err != nil {
|
|
// return err
|
|
// }
|
|
|
|
return nil
|
|
})
|
|
}
|
|
|
|
func (b *LMDBBackend) setVersion(txn *lmdb.Txn, version uint16) error {
|
|
buf, err := txn.PutReserve(b.settingsStore, []byte{DB_VERSION}, 4, 0)
|
|
binary.BigEndian.PutUint16(buf, version)
|
|
return err
|
|
}
|