boltdb support.

bolt/migration.go

@@ -0,0 +1,32 @@
+package bolt
+
+import (
+	"encoding/binary"
+
+	"github.com/boltdb/bolt"
+)
+
+const (
+	DB_VERSION byte = 'v'
+)
+
+func (b *BoltBackend) runMigrations() error {
+	return b.db.Update(func(txn *bolt.Tx) error {
+		var version uint16
+		v := txn.Bucket(bucketSettings).Get([]byte{DB_VERSION})
+		if v == nil {
+			version = 0
+		} else {
+			version = binary.BigEndian.Uint16(v)
+		}
+
+		// do the migrations in increasing steps (there is no rollback)
+		//
+
+		if version < 0 {
+			// ...
+		}
+
+		return nil
+	})
+}