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118 lines
3.0 KiB
118 lines
3.0 KiB
package types
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"time"
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"github.com/tendermint/go-crypto"
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"github.com/tendermint/go-wire"
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cmn "github.com/tendermint/tmlibs/common"
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)
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var (
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ErrVoteUnexpectedStep = errors.New("Unexpected step")
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ErrVoteInvalidValidatorIndex = errors.New("Invalid validator index")
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ErrVoteInvalidValidatorAddress = errors.New("Invalid validator address")
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ErrVoteInvalidSignature = errors.New("Invalid signature")
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ErrVoteInvalidBlockHash = errors.New("Invalid block hash")
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ErrVoteNonDeterministicSignature = errors.New("Non-deterministic signature")
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ErrVoteNil = errors.New("Nil vote")
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)
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type ErrVoteConflictingVotes struct {
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*DuplicateVoteEvidence
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}
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func (err *ErrVoteConflictingVotes) Error() string {
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return fmt.Sprintf("Conflicting votes from validator %v", err.PubKey.Address())
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}
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func NewConflictingVoteError(val *Validator, voteA, voteB *Vote) *ErrVoteConflictingVotes {
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return &ErrVoteConflictingVotes{
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&DuplicateVoteEvidence{
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PubKey: val.PubKey,
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VoteA: voteA,
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VoteB: voteB,
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},
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}
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}
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// Types of votes
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// TODO Make a new type "VoteType"
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const (
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VoteTypePrevote = byte(0x01)
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VoteTypePrecommit = byte(0x02)
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)
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func IsVoteTypeValid(type_ byte) bool {
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switch type_ {
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case VoteTypePrevote:
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return true
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case VoteTypePrecommit:
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return true
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default:
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return false
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}
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}
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// Address is hex bytes. TODO: crypto.Address
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type Address = cmn.HexBytes
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// Represents a prevote, precommit, or commit vote from validators for consensus.
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type Vote struct {
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ValidatorAddress Address `json:"validator_address"`
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ValidatorIndex int `json:"validator_index"`
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Height int64 `json:"height"`
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Round int `json:"round"`
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Timestamp time.Time `json:"timestamp"`
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Type byte `json:"type"`
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BlockID BlockID `json:"block_id"` // zero if vote is nil.
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Signature crypto.Signature `json:"signature"`
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}
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func (vote *Vote) WriteSignBytes(chainID string, w io.Writer, n *int, err *error) {
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wire.WriteJSON(CanonicalJSONOnceVote{
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chainID,
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CanonicalVote(vote),
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}, w, n, err)
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}
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func (vote *Vote) Copy() *Vote {
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voteCopy := *vote
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return &voteCopy
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}
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func (vote *Vote) String() string {
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if vote == nil {
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return "nil-Vote"
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}
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var typeString string
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switch vote.Type {
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case VoteTypePrevote:
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typeString = "Prevote"
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case VoteTypePrecommit:
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typeString = "Precommit"
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default:
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cmn.PanicSanity("Unknown vote type")
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}
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return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %v @ %s}",
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vote.ValidatorIndex, cmn.Fingerprint(vote.ValidatorAddress),
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vote.Height, vote.Round, vote.Type, typeString,
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cmn.Fingerprint(vote.BlockID.Hash), vote.Signature,
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CanonicalTime(vote.Timestamp))
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}
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func (vote *Vote) Verify(chainID string, pubKey crypto.PubKey) error {
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if !bytes.Equal(pubKey.Address(), vote.ValidatorAddress) {
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return ErrVoteInvalidValidatorAddress
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}
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if !pubKey.VerifyBytes(SignBytes(chainID, vote), vote.Signature) {
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return ErrVoteInvalidSignature
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}
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return nil
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}
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