Exemplo n.º 1
0
func (qs *QuadStore) Quad(k graph.Value) quad.Quad {
	var d proto.LogDelta
	tok := k.(*Token)
	err := qs.db.View(func(tx *bolt.Tx) error {
		b := tx.Bucket(tok.bucket)
		data := b.Get(tok.key)
		if data == nil {
			return nil
		}
		var in proto.HistoryEntry
		err := in.Unmarshal(data)
		if err != nil {
			return err
		}
		if len(in.History) == 0 {
			return nil
		}
		b = tx.Bucket(logBucket)
		data = b.Get(qs.createDeltaKeyFor(int64(in.History[len(in.History)-1])))
		if data == nil {
			// No harm, no foul.
			return nil
		}
		return d.Unmarshal(data)
	})
	if err != nil {
		glog.Error("Error getting quad: ", err)
		return quad.Quad{}
	}
	return d.Quad.ToNative()
}
Exemplo n.º 2
0
func (qs *QuadStore) Quad(k graph.Value) quad.Quad {
	var in proto.HistoryEntry
	b, err := qs.db.Get(k.(Token), qs.readopts)
	if err == leveldb.ErrNotFound {
		// No harm, no foul.
		return quad.Quad{}
	} else if err != nil {
		glog.Error("Error: could not get quad from DB.")
		return quad.Quad{}
	}
	err = in.Unmarshal(b)
	if err != nil {
		glog.Error("Error: could not reconstruct history.", err)
		return quad.Quad{}
	}
	b, err = qs.db.Get(createDeltaKeyFor(int64(in.History[len(in.History)-1])), qs.readopts)
	if err == leveldb.ErrNotFound {
		// No harm, no foul.
		return quad.Quad{}
	} else if err != nil {
		glog.Error("Error: could not get quad from DB.")
		return quad.Quad{}
	}
	var d proto.LogDelta
	err = d.Unmarshal(b)
	if err != nil {
		glog.Error("Error: could not reconstruct quad.", err)
		return quad.Quad{}
	}
	return d.Quad.ToNative()
}
Exemplo n.º 3
0
func deltaToProto(delta graph.Delta) proto.LogDelta {
	var newd proto.LogDelta
	newd.ID = uint64(delta.ID.Int())
	newd.Action = int32(delta.Action)
	newd.Timestamp = delta.Timestamp.UnixNano()
	newd.Quad = proto.MakeQuad(delta.Quad)
	return newd
}
Exemplo n.º 4
0
func upgrade2To3(db *bolt.DB) error {
	fmt.Println("Upgrading v2 to v3...")
	tx, err := db.Begin(true)
	if err != nil {
		return err
	}
	defer tx.Rollback()
	fmt.Println("Upgrading bucket", string(logBucket))
	lb := tx.Bucket(logBucket)
	c := lb.Cursor()
	for k, v := c.First(); k != nil; k, v = c.Next() {
		var delta proto.LogDelta
		err := delta.Unmarshal(v)
		if err != nil {
			return err
		}
		delta.Quad.Upgrade()
		data, err := delta.Marshal()
		if err != nil {
			return err
		}
		lb.Put(k, data)
	}
	if err := tx.Commit(); err != nil {
		return err
	}
	tx, err = db.Begin(true)
	if err != nil {
		return err
	}
	defer tx.Rollback()
	fmt.Println("Upgrading bucket", string(nodeBucket))
	nb := tx.Bucket(nodeBucket)
	c = nb.Cursor()
	for k, v := c.First(); k != nil; k, v = c.Next() {
		var vd proto.NodeData
		err := vd.Unmarshal(v)
		if err != nil {
			return err
		}
		vd.Upgrade()
		data, err := vd.Marshal()
		if err != nil {
			return err
		}
		nb.Put(k, data)
	}
	if err := tx.Commit(); err != nil {
		return err
	}
	return nil
}
Exemplo n.º 5
0
func deltaToProto(delta graph.Delta) proto.LogDelta {
	var newd proto.LogDelta
	newd.ID = uint64(delta.ID.Int())
	newd.Action = int32(delta.Action)
	newd.Timestamp = delta.Timestamp.UnixNano()
	newd.Quad = &proto.Quad{
		Subject:   delta.Quad.Subject,
		Predicate: delta.Quad.Predicate,
		Object:    delta.Quad.Object,
		Label:     delta.Quad.Label,
	}
	return newd
}
Exemplo n.º 6
0
// Quad ??
func (qs *QuadStore) Quad(k graph.Value) quad.Quad {
	var d proto.LogDelta
	tok := k.(*Token)
	err := qs.env.View(func(tx *lmdb.Txn) (err error) {
		tx.RawRead = true

		dbi := qs.dbis[tok.db]
		data, _ := tx.Get(dbi, tok.key)
		if data == nil {
			return nil
		}
		var in proto.HistoryEntry
		err = in.Unmarshal(data)
		if err != nil {
			return err
		}
		if len(in.History) == 0 {
			return nil
		}
		data, _ = tx.Get(qs.logDBI, qs.createDeltaKeyFor(int64(in.History[len(in.History)-1])))
		if data == nil {
			// No harm, no foul.
			return nil
		}
		return d.Unmarshal(data)
	})
	if err != nil {
		glog.Error("Error getting quad: ", err)
		return quad.Quad{}
	}
	if d.Quad == nil {
		glog.Error("Unable to get quad: ", err)
		return quad.Quad{}
	}
	return quad.Quad{
		d.Quad.Subject,
		d.Quad.Predicate,
		d.Quad.Object,
		d.Quad.Label,
	}
}