lnd.xprv/channeldb/migration_01_to_11/meta.go
2021-05-07 14:18:56 +02:00

40 lines
1.0 KiB
Go

package migration_01_to_11
import (
"github.com/lightningnetwork/lnd/kvdb"
)
var (
// metaBucket stores all the meta information concerning the state of
// the database.
metaBucket = []byte("metadata")
// dbVersionKey is a boltdb key and it's used for storing/retrieving
// current database version.
dbVersionKey = []byte("dbp")
)
// Meta structure holds the database meta information.
type Meta struct {
// DbVersionNumber is the current schema version of the database.
DbVersionNumber uint32
}
// putMeta is an internal helper function used in order to allow callers to
// re-use a database transaction. See the publicly exported PutMeta method for
// more information.
func putMeta(meta *Meta, tx kvdb.RwTx) error {
metaBucket, err := tx.CreateTopLevelBucket(metaBucket)
if err != nil {
return err
}
return putDbVersion(metaBucket, meta)
}
func putDbVersion(metaBucket kvdb.RwBucket, meta *Meta) error {
scratch := make([]byte, 4)
byteOrder.PutUint32(scratch, meta.DbVersionNumber)
return metaBucket.Put(dbVersionKey, scratch)
}