| 431 | } |
| 432 | |
| 433 | func (s *Service) getAck(dbID proto.DatabaseID, h *hash.Hash) (ack *types.SignedAckHeader, err error) { |
| 434 | var ( |
| 435 | blockHeight int32 |
| 436 | dataOffset int32 |
| 437 | ) |
| 438 | |
| 439 | err = s.db.Writer().QueryRow(getAckByHashSQL, string(dbID), h.String()).Scan(&blockHeight, &dataOffset) |
| 440 | if err != nil { |
| 441 | if errors.Cause(err) == sql.ErrNoRows { |
| 442 | err = ErrNotFound |
| 443 | return |
| 444 | } |
| 445 | |
| 446 | err = errors.Wrapf(err, "query ack failed: %s, %s", dbID, h.String()) |
| 447 | return |
| 448 | } |
| 449 | |
| 450 | // get data from block |
| 451 | var b *types.Block |
| 452 | if _, b, err = s.getBlockByHeight(dbID, blockHeight); err != nil { |
| 453 | return |
| 454 | } |
| 455 | |
| 456 | if dataOffset < 0 || int32(len(b.Acks)) <= dataOffset { |
| 457 | err = ErrInconsistentData |
| 458 | return |
| 459 | } |
| 460 | |
| 461 | ack = b.Acks[int(dataOffset)] |
| 462 | |
| 463 | // verify hash |
| 464 | ackHash := ack.Hash() |
| 465 | if !ackHash.IsEqual(h) { |
| 466 | err = ErrInconsistentData |
| 467 | } |
| 468 | |
| 469 | return |
| 470 | } |
| 471 | |
| 472 | func (s *Service) getRequest(dbID proto.DatabaseID, h *hash.Hash) (request *types.Request, err error) { |
| 473 | var ( |