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