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173 lines
4.6 KiB
173 lines
4.6 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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"time"
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"github.com/tendermint/tendermint/crypto"
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tmbytes "github.com/tendermint/tendermint/libs/bytes"
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)
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const (
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// MaxVoteBytes is a maximum vote size (including amino overhead).
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MaxVoteBytes int64 = 223
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nilVoteStr string = "nil-Vote"
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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, vote1, vote2 *Vote) *ErrVoteConflictingVotes {
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return &ErrVoteConflictingVotes{
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NewDuplicateVoteEvidence(val.PubKey, vote1, vote2),
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}
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}
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// Address is hex bytes.
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type Address = crypto.Address
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// Vote represents a prevote, precommit, or commit vote from validators for
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// consensus.
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type Vote struct {
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Type SignedMsgType `json:"type"`
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Height int64 `json:"height"`
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Round int `json:"round"`
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BlockID BlockID `json:"block_id"` // zero if vote is nil.
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Timestamp time.Time `json:"timestamp"`
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ValidatorAddress Address `json:"validator_address"`
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ValidatorIndex int `json:"validator_index"`
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Signature []byte `json:"signature"`
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}
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// CommitSig converts the Vote to a CommitSig.
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func (vote *Vote) CommitSig() CommitSig {
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if vote == nil {
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return NewCommitSigAbsent()
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}
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var blockIDFlag BlockIDFlag
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switch {
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case vote.BlockID.IsComplete():
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blockIDFlag = BlockIDFlagCommit
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case vote.BlockID.IsZero():
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blockIDFlag = BlockIDFlagNil
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default:
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panic(fmt.Sprintf("Invalid vote %v - expected BlockID to be either empty or complete", vote))
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}
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return CommitSig{
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BlockIDFlag: blockIDFlag,
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ValidatorAddress: vote.ValidatorAddress,
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Timestamp: vote.Timestamp,
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Signature: vote.Signature,
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}
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}
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func (vote *Vote) SignBytes(chainID string) []byte {
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bz, err := cdc.MarshalBinaryLengthPrefixed(CanonicalizeVote(chainID, vote))
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if err != nil {
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panic(err)
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}
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return bz
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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 nilVoteStr
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}
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var typeString string
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switch vote.Type {
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case PrevoteType:
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typeString = "Prevote"
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case PrecommitType:
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typeString = "Precommit"
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default:
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panic("Unknown vote type")
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}
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return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %X @ %s}",
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vote.ValidatorIndex,
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tmbytes.Fingerprint(vote.ValidatorAddress),
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vote.Height,
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vote.Round,
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vote.Type,
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typeString,
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tmbytes.Fingerprint(vote.BlockID.Hash),
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tmbytes.Fingerprint(vote.Signature),
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CanonicalTime(vote.Timestamp),
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)
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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(vote.SignBytes(chainID), 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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// ValidateBasic performs basic validation.
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func (vote *Vote) ValidateBasic() error {
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if !IsVoteTypeValid(vote.Type) {
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return errors.New("invalid Type")
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}
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if vote.Height < 0 {
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return errors.New("negative Height")
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}
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if vote.Round < 0 {
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return errors.New("negative Round")
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}
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// NOTE: Timestamp validation is subtle and handled elsewhere.
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if err := vote.BlockID.ValidateBasic(); err != nil {
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return fmt.Errorf("wrong BlockID: %v", err)
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}
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// BlockID.ValidateBasic would not err if we for instance have an empty hash but a
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// non-empty PartsSetHeader:
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if !vote.BlockID.IsZero() && !vote.BlockID.IsComplete() {
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return fmt.Errorf("blockID must be either empty or complete, got: %v", vote.BlockID)
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}
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if len(vote.ValidatorAddress) != crypto.AddressSize {
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return fmt.Errorf("expected ValidatorAddress size to be %d bytes, got %d bytes",
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crypto.AddressSize,
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len(vote.ValidatorAddress),
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)
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}
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if vote.ValidatorIndex < 0 {
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return errors.New("negative ValidatorIndex")
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}
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if len(vote.Signature) == 0 {
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return errors.New("signature is missing")
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}
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if len(vote.Signature) > MaxSignatureSize {
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return fmt.Errorf("signature is too big (max: %d)", MaxSignatureSize)
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}
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return nil
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}
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