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  1. package types
  2. import (
  3. "errors"
  4. "fmt"
  5. "io"
  6. "github.com/tendermint/go-crypto"
  7. "github.com/tendermint/go-wire"
  8. "github.com/tendermint/go-wire/data"
  9. cmn "github.com/tendermint/tmlibs/common"
  10. )
  11. var (
  12. ErrVoteUnexpectedStep = errors.New("Unexpected step")
  13. ErrVoteInvalidValidatorIndex = errors.New("Invalid validator index")
  14. ErrVoteInvalidValidatorAddress = errors.New("Invalid validator address")
  15. ErrVoteInvalidSignature = errors.New("Invalid signature")
  16. ErrVoteInvalidBlockHash = errors.New("Invalid block hash")
  17. ErrVoteNil = errors.New("Nil vote")
  18. )
  19. type ErrVoteConflictingVotes struct {
  20. VoteA *Vote
  21. VoteB *Vote
  22. }
  23. func (err *ErrVoteConflictingVotes) Error() string {
  24. return "Conflicting votes"
  25. }
  26. // Types of votes
  27. // TODO Make a new type "VoteType"
  28. const (
  29. VoteTypePrevote = byte(0x01)
  30. VoteTypePrecommit = byte(0x02)
  31. )
  32. func IsVoteTypeValid(type_ byte) bool {
  33. switch type_ {
  34. case VoteTypePrevote:
  35. return true
  36. case VoteTypePrecommit:
  37. return true
  38. default:
  39. return false
  40. }
  41. }
  42. // Represents a prevote, precommit, or commit vote from validators for consensus.
  43. type Vote struct {
  44. ValidatorAddress data.Bytes `json:"validator_address"`
  45. ValidatorIndex int `json:"validator_index"`
  46. Height int64 `json:"height"`
  47. Round int `json:"round"`
  48. Type byte `json:"type"`
  49. BlockID BlockID `json:"block_id"` // zero if vote is nil.
  50. Signature crypto.Signature `json:"signature"`
  51. }
  52. func (vote *Vote) WriteSignBytes(chainID string, w io.Writer, n *int, err *error) {
  53. wire.WriteJSON(CanonicalJSONOnceVote{
  54. chainID,
  55. CanonicalVote(vote),
  56. }, w, n, err)
  57. }
  58. func (vote *Vote) Copy() *Vote {
  59. voteCopy := *vote
  60. return &voteCopy
  61. }
  62. func (vote *Vote) String() string {
  63. if vote == nil {
  64. return "nil-Vote"
  65. }
  66. var typeString string
  67. switch vote.Type {
  68. case VoteTypePrevote:
  69. typeString = "Prevote"
  70. case VoteTypePrecommit:
  71. typeString = "Precommit"
  72. default:
  73. cmn.PanicSanity("Unknown vote type")
  74. }
  75. return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %v}",
  76. vote.ValidatorIndex, cmn.Fingerprint(vote.ValidatorAddress),
  77. vote.Height, vote.Round, vote.Type, typeString,
  78. cmn.Fingerprint(vote.BlockID.Hash), vote.Signature)
  79. }