// GetSnapshot returns the snapshot of the computation's persisted state
func (p *LevelDBPersister) GetSnapshot(compID StreamID) ([]byte, error) {
dbSnapshot, err := p.db.GetSnapshot()
defer dbSnapshot.Release()
if err != nil {
return nil, fmt.Errorf("[persister] Error getting snapshot: %s", err)
}
keyPrefix := compID
batch := new(leveldb.Batch)
iter := dbSnapshot.NewIterator(util.BytesPrefix([]byte(keyPrefix)), nil)
defer iter.Release()
for iter.Next() {
batch.Put(iter.Key(), iter.Value())
}
err = iter.Error()
if err != nil {
return nil, fmt.Errorf("[persister] error iterating: %s", err)
}
return batch.Dump(), nil
}