lnd.xprv/channeldb/migration_01_to_11/meta.go

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package migration_01_to_11
import "github.com/coreos/bbolt"
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 *bbolt.Tx) error {
metaBucket, err := tx.CreateBucketIfNotExists(metaBucket)
if err != nil {
return err
}
return putDbVersion(metaBucket, meta)
}
func putDbVersion(metaBucket *bbolt.Bucket, meta *Meta) error {
scratch := make([]byte, 4)
byteOrder.PutUint32(scratch, meta.DbVersionNumber)
return metaBucket.Put(dbVersionKey, scratch)
}