package types import ( "bytes" "errors" "fmt" "time" "github.com/tendermint/tendermint/crypto" cmn "github.com/tendermint/tendermint/libs/common" ) const ( // MaxVoteBytes is a maximum vote size (including amino overhead). MaxVoteBytes int64 = 223 ) var ( ErrVoteUnexpectedStep = errors.New("Unexpected step") ErrVoteInvalidValidatorIndex = errors.New("Invalid validator index") ErrVoteInvalidValidatorAddress = errors.New("Invalid validator address") ErrVoteInvalidSignature = errors.New("Invalid signature") ErrVoteInvalidBlockHash = errors.New("Invalid block hash") ErrVoteNonDeterministicSignature = errors.New("Non-deterministic signature") ErrVoteNil = errors.New("Nil vote") ) type ErrVoteConflictingVotes struct { *DuplicateVoteEvidence } func (err *ErrVoteConflictingVotes) Error() string { return fmt.Sprintf("Conflicting votes from validator %v", err.PubKey.Address()) } func NewConflictingVoteError(val *Validator, voteA, voteB *Vote) *ErrVoteConflictingVotes { return &ErrVoteConflictingVotes{ &DuplicateVoteEvidence{ PubKey: val.PubKey, VoteA: voteA, VoteB: voteB, }, } } // Address is hex bytes. type Address = crypto.Address // Vote represents a prevote, precommit, or commit vote from validators for // consensus. type Vote struct { Type SignedMsgType `json:"type"` Height int64 `json:"height"` Round int `json:"round"` BlockID BlockID `json:"block_id"` // zero if vote is nil. Timestamp time.Time `json:"timestamp"` ValidatorAddress Address `json:"validator_address"` ValidatorIndex int `json:"validator_index"` Signature []byte `json:"signature"` } // CommitSig converts the Vote to a CommitSig. // If the Vote is nil, the CommitSig will be nil. func (vote *Vote) CommitSig() *CommitSig { if vote == nil { return nil } cs := CommitSig(*vote) return &cs } func (vote *Vote) SignBytes(chainID string) []byte { bz, err := cdc.MarshalBinaryLengthPrefixed(CanonicalizeVote(chainID, vote)) if err != nil { panic(err) } return bz } func (vote *Vote) Copy() *Vote { voteCopy := *vote return &voteCopy } func (vote *Vote) String() string { if vote == nil { return "nil-Vote" } var typeString string switch vote.Type { case PrevoteType: typeString = "Prevote" case PrecommitType: typeString = "Precommit" default: panic("Unknown vote type") } return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %X @ %s}", vote.ValidatorIndex, cmn.Fingerprint(vote.ValidatorAddress), vote.Height, vote.Round, vote.Type, typeString, cmn.Fingerprint(vote.BlockID.Hash), cmn.Fingerprint(vote.Signature), CanonicalTime(vote.Timestamp), ) } func (vote *Vote) Verify(chainID string, pubKey crypto.PubKey) error { if !bytes.Equal(pubKey.Address(), vote.ValidatorAddress) { return ErrVoteInvalidValidatorAddress } if !pubKey.VerifyBytes(vote.SignBytes(chainID), vote.Signature) { return ErrVoteInvalidSignature } return nil } // ValidateBasic performs basic validation. func (vote *Vote) ValidateBasic() error { if !IsVoteTypeValid(vote.Type) { return errors.New("Invalid Type") } if vote.Height < 0 { return errors.New("Negative Height") } if vote.Round < 0 { return errors.New("Negative Round") } // NOTE: Timestamp validation is subtle and handled elsewhere. if err := vote.BlockID.ValidateBasic(); err != nil { return fmt.Errorf("Wrong BlockID: %v", err) } // BlockID.ValidateBasic would not err if we for instance have an empty hash but a // non-empty PartsSetHeader: if !vote.BlockID.IsZero() && !vote.BlockID.IsComplete() { return fmt.Errorf("BlockID must be either empty or complete, got: %v", vote.BlockID) } if len(vote.ValidatorAddress) != crypto.AddressSize { return fmt.Errorf("Expected ValidatorAddress size to be %d bytes, got %d bytes", crypto.AddressSize, len(vote.ValidatorAddress), ) } if vote.ValidatorIndex < 0 { return errors.New("Negative ValidatorIndex") } if len(vote.Signature) == 0 { return errors.New("Signature is missing") } if len(vote.Signature) > MaxSignatureSize { return fmt.Errorf("Signature is too big (max: %d)", MaxSignatureSize) } return nil }