Golang HistoryEntry.History方法代码示例

func (qs *QuadStore) buildQuadWrite(tx *bolt.Tx, q quad.Quad, id int64, isAdd bool) error {
	var entry proto.HistoryEntry
	b := tx.Bucket(spoBucket)
	b.FillPercent = localFillPercent
	data := b.Get(qs.createKeyFor(spo, q))
	if data != nil {
		// We got something.
		err := entry.Unmarshal(data)
		if err != nil {
			return err
		}
	}

	if isAdd && len(entry.History)%2 == 1 {
		clog.Errorf("attempt to add existing quad %v: %#v", entry, q)
		return graph.ErrQuadExists
	}
	if !isAdd && len(entry.History)%2 == 0 {
		clog.Errorf("attempt to delete non-existent quad %v: %#v", entry, q)
		return graph.ErrQuadNotExist
	}

	entry.History = append(entry.History, uint64(id))

	bytes, err := entry.Marshal()
	if err != nil {
		clog.Errorf("Couldn't write to buffer for entry %#v: %s", entry, err)
		return err
	}
	for _, index := range [][4]quad.Direction{spo, osp, pos, cps} {
		if index == cps && q.Get(quad.Label) == "" {
			continue
		}
		b := tx.Bucket(bucketFor(index))
		b.FillPercent = localFillPercent
		err = b.Put(qs.createKeyFor(index, q), bytes)
		if err != nil {
			return err
		}
	}
	return nil
}

func (qs *QuadStore) buildQuadWrite(batch *leveldb.Batch, q quad.Quad, id int64, isAdd bool) error {
	var entry proto.HistoryEntry
	data, err := qs.db.Get(createKeyFor(spo, q), qs.readopts)
	if err != nil && err != leveldb.ErrNotFound {
		clog.Errorf("could not access DB to prepare index: %v", err)
		return err
	}
	if data != nil {
		// We got something.
		err = entry.Unmarshal(data)
		if err != nil {
			return err
		}
	}

	if isAdd && len(entry.History)%2 == 1 {
		clog.Errorf("attempt to add existing quad %v: %#v", entry, q)
		return graph.ErrQuadExists
	}
	if !isAdd && len(entry.History)%2 == 0 {
		clog.Errorf("attempt to delete non-existent quad %v: %#c", entry, q)
		return graph.ErrQuadNotExist
	}

	entry.History = append(entry.History, uint64(id))

	bytes, err := entry.Marshal()
	if err != nil {
		clog.Errorf("could not write to buffer for entry %#v: %s", entry, err)
		return err
	}
	batch.Put(createKeyFor(spo, q), bytes)
	batch.Put(createKeyFor(osp, q), bytes)
	batch.Put(createKeyFor(pos, q), bytes)
	if q.Get(quad.Label) != nil {
		batch.Put(createKeyFor(cps, q), bytes)
	}
	return nil
}

func upgrade1To2(db *leveldb.DB) error {
	fmt.Println("Upgrading v1 to v2...")

	type v1IndexEntry struct {
		Subject   string  `json:"subject"`
		Predicate string  `json:"predicate"`
		Object    string  `json:"object"`
		Label     string  `json:"label,omitempty"`
		History   []int64 `json:"History"`
	}

	type v1ValueData struct {
		Name string `json:"Name"`
		Size int64  `json:"Size"`
	}

	var (
		spoPref = []byte{spo[0].Prefix(), spo[1].Prefix()}
		ospPref = []byte{osp[0].Prefix(), osp[1].Prefix()}
		posPref = []byte{pos[0].Prefix(), pos[1].Prefix()}
		cpsPref = []byte{cps[0].Prefix(), cps[1].Prefix()}
	)

	{
		fmt.Println("Upgrading bucket z")
		it := db.NewIterator(&util.Range{Start: []byte{'z'}, Limit: []byte{'z' + 1}}, nil)
		for it.Next() {
			k, v := it.Key(), it.Value()
			var val v1ValueData
			if err := json.Unmarshal(v, &val); err != nil {
				return err
			}
			node := proto.NodeData{
				Size:  val.Size,
				Value: proto.MakeValue(quad.Raw(val.Name)),
			}
			nv, err := node.Marshal()
			if err != nil {
				return err
			}
			if err = db.Put(k, nv, nil); err != nil {
				return err
			}
		}
		it.Release()
	}

	for _, pref := range [4][]byte{spoPref, ospPref, posPref, cpsPref} {
		fmt.Println("Upgrading bucket", string(pref))
		end := []byte{pref[0], pref[1] + 1}
		it := db.NewIterator(&util.Range{Start: pref, Limit: end}, nil)
		for it.Next() {
			k, v := it.Key(), it.Value()
			var entry v1IndexEntry
			if err := json.Unmarshal(v, &entry); err != nil {
				return err
			}
			var h proto.HistoryEntry
			h.History = make([]uint64, len(entry.History))
			for i, id := range entry.History {
				h.History[i] = uint64(id)
			}
			nv, err := h.Marshal()
			if err != nil {
				return err
			}
			if err = db.Put(k, nv, nil); err != nil {
				return err
			}
		}
		it.Release()
	}

	{
		fmt.Println("Upgrading bucket d")
		it := db.NewIterator(&util.Range{Start: []byte{'d'}, Limit: []byte{'d' + 1}}, nil)
		for it.Next() {
			k, v := it.Key(), it.Value()
			id, err := strconv.ParseInt(string(k[1:]), 16, 64)
			if err != nil {
				return err
			}
			nk := createDeltaKeyFor(id)
			var val graph.Delta
			if err := json.Unmarshal(v, &val); err != nil {
				return err
			}
			p := deltaToProto(val)
			nv, err := p.Marshal()
			if err != nil {
				return err
			}
			b := &leveldb.Batch{}
			b.Put(nk, nv)
			b.Delete(k)
			if err = db.Write(b, nil); err != nil {
				return err
			}
		}
		it.Release()
//.........这里部分代码省略.........