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  1. package block
  2. import (
  3. "errors"
  4. "fmt"
  5. "io"
  6. "github.com/tendermint/tendermint/account"
  7. "github.com/tendermint/tendermint/binary"
  8. . "github.com/tendermint/tendermint/common"
  9. )
  10. var (
  11. ErrVoteUnexpectedStep = errors.New("Unexpected step")
  12. ErrVoteInvalidAccount = errors.New("Invalid round vote account")
  13. ErrVoteInvalidSignature = errors.New("Invalid round vote signature")
  14. ErrVoteInvalidBlockHash = errors.New("Invalid block hash")
  15. )
  16. type ErrVoteConflictingSignature struct {
  17. VoteA *Vote
  18. VoteB *Vote
  19. }
  20. func (err *ErrVoteConflictingSignature) Error() string {
  21. return "Conflicting round vote signature"
  22. }
  23. // Represents a prevote, precommit, or commit vote from validators for consensus.
  24. // Commit votes get aggregated into the next block's Validaiton.
  25. // See the whitepaper for details.
  26. type Vote struct {
  27. Height uint
  28. Round uint
  29. Type byte
  30. BlockHash []byte // empty if vote is nil.
  31. BlockParts PartSetHeader // zero if vote is nil.
  32. Signature account.SignatureEd25519
  33. }
  34. // Types of votes
  35. const (
  36. VoteTypePrevote = byte(0x00)
  37. VoteTypePrecommit = byte(0x01)
  38. VoteTypeCommit = byte(0x02)
  39. )
  40. func (vote *Vote) WriteSignBytes(w io.Writer, n *int64, err *error) {
  41. binary.WriteUvarint(vote.Height, w, n, err)
  42. binary.WriteUvarint(vote.Round, w, n, err)
  43. binary.WriteByte(vote.Type, w, n, err)
  44. binary.WriteByteSlice(vote.BlockHash, w, n, err)
  45. binary.WriteBinary(vote.BlockParts, w, n, err)
  46. }
  47. func (vote *Vote) Copy() *Vote {
  48. voteCopy := *vote
  49. return &voteCopy
  50. }
  51. func (vote *Vote) String() string {
  52. var typeString string
  53. switch vote.Type {
  54. case VoteTypePrevote:
  55. typeString = "Prevote"
  56. case VoteTypePrecommit:
  57. typeString = "Precommit"
  58. case VoteTypeCommit:
  59. typeString = "Commit"
  60. default:
  61. panic("Unknown vote type")
  62. }
  63. return fmt.Sprintf("%v{%v/%v %X#%v %v}", typeString, vote.Height, vote.Round, Fingerprint(vote.BlockHash), vote.BlockParts, vote.Signature)
  64. }