Ejemplo n.º 1
0
// Read reads the snapshot named by snapname and returns the snapshot.
func Read(snapname string) (*raftpb.Snapshot, error) {
	b, err := ioutil.ReadFile(snapname)
	if err != nil {
		log.Printf("snap: snapshotter cannot read file %v: %v", snapname, err)
		return nil, err
	}

	var serializedSnap snappb.Snapshot
	if err = serializedSnap.Unmarshal(b); err != nil {
		log.Printf("snap: corrupted snapshot file %v: %v", snapname, err)
		return nil, err
	}

	if len(serializedSnap.Data) == 0 || serializedSnap.Crc == 0 {
		log.Printf("snap: unexpected empty snapshot")
		return nil, ErrEmptySnapshot
	}

	crc := crc32.Update(0, crcTable, serializedSnap.Data)
	if crc != serializedSnap.Crc {
		log.Printf("snap: corrupted snapshot file %v: crc mismatch", snapname)
		return nil, ErrCRCMismatch
	}

	var snap raftpb.Snapshot
	if err = snap.Unmarshal(serializedSnap.Data); err != nil {
		log.Printf("snap: corrupted snapshot file %v: %v", snapname, err)
		return nil, err
	}
	return &snap, nil
}
Ejemplo n.º 2
0
func (s *Snapshotter) save(snapshot *raftpb.Snapshot) error {
	start := time.Now()

	fname := fmt.Sprintf("%016x-%016x%s", snapshot.Metadata.Term, snapshot.Metadata.Index, snapSuffix)
	b := pbutil.MustMarshal(snapshot)
	crc := crc32.Update(0, crcTable, b)
	snap := snappb.Snapshot{Crc: crc, Data: b}
	d, err := snap.Marshal()
	if err != nil {
		return err
	}
	err = ioutil.WriteFile(path.Join(s.dir, fname), d, 0666)
	if err != nil {
		saveDurations.Observe(float64(time.Since(start).Nanoseconds() / int64(time.Microsecond)))
	}
	return err
}