package storm import ( "reflect" "github.com/boltdb/bolt" ) const ( metaCodec = "codec" ) func newMeta(b *bolt.Bucket, n Node) (*meta, error) { m := b.Bucket([]byte(metadataBucket)) if m != nil { name := m.Get([]byte(metaCodec)) if string(name) != n.Codec().Name() { return nil, ErrDifferentCodec } return &meta{ node: n, bucket: m, }, nil } m, err := b.CreateBucket([]byte(metadataBucket)) if err != nil { return nil, err } m.Put([]byte(metaCodec), []byte(n.Codec().Name())) return &meta{ node: n, bucket: m, }, nil } type meta struct { node Node bucket *bolt.Bucket } func (m *meta) increment(field *fieldConfig) error { var err error counter := field.IncrementStart raw := m.bucket.Get([]byte(field.Name + "counter")) if raw != nil { counter, err = numberfromb(raw) if err != nil { return err } counter++ } raw, err = numbertob(counter) if err != nil { return err } err = m.bucket.Put([]byte(field.Name+"counter"), raw) if err != nil { return err } field.Value.Set(reflect.ValueOf(counter).Convert(field.Value.Type())) field.IsZero = false return nil }