func (fs *FragmentStorage) CreateSnapshot(i uint64, cs *pb.ConfState, data []byte) (pb.Snapshot, error) {
fs.Lock()
defer fs.Unlock()
snapshot := pb.Snapshot{}
preSnapshot, err := fs.Snapshot()
if err != nil {
return snapshot, err
}
if i <= preSnapshot.Metadata.Index {
return pb.Snapshot{}, ErrSnapOutOfDate
}
lastIndex, err := fs.LastIndex()
if err != nil {
return snapshot, err
}
if i > lastIndex {
fmt.Errorf("snapshot %d is out of bound lastindex(%d)", i, lastIndex)
}
snapshot.Metadata.Index = i
if en, err := fs.Entry(i); err != nil {
return snapshot, err
} else {
snapshot.Metadata.Term = en.Term
}
if cs != nil {
snapshot.Metadata.ConfState = *cs
}
snapshot.Data = data
return snapshot, nil
}
