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96 lines
2.7 KiB
96 lines
2.7 KiB
package consensus
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import (
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"fmt"
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"github.com/tendermint/tendermint/account"
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. "github.com/tendermint/tendermint/common"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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)
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// Each signature of a POL (proof-of-lock, see whitepaper) is
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// either a prevote or a commit.
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// Commits require an additional round which is strictly less than
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// the POL round. Prevote rounds are equal to the POL round.
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type POLVoteSignature struct {
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Round uint
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Signature account.SignatureEd25519
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}
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// Proof of lock.
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// +2/3 of validators' prevotes for a given blockhash (or nil)
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type POL struct {
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Height uint
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Round uint
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BlockHash []byte // Could be nil, which makes this a proof of unlock.
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BlockParts types.PartSetHeader // When BlockHash is nil, this is zero.
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Votes []POLVoteSignature // Prevote and commit signatures in ValidatorSet order.
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}
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// Returns whether +2/3 have prevoted/committed for BlockHash.
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func (pol *POL) Verify(valSet *sm.ValidatorSet) error {
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if uint(len(pol.Votes)) != valSet.Size() {
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return Errorf("Invalid POL votes count: Expected %v, got %v",
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valSet.Size(), len(pol.Votes))
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}
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talliedVotingPower := uint64(0)
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prevoteDoc := account.SignBytes(&types.Vote{
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Height: pol.Height, Round: pol.Round, Type: types.VoteTypePrevote,
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BlockHash: pol.BlockHash,
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BlockParts: pol.BlockParts,
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})
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seenValidators := map[string]struct{}{}
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for idx, vote := range pol.Votes {
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// vote may be zero, in which case skip.
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if vote.Signature.IsZero() {
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continue
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}
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voteDoc := prevoteDoc
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_, val := valSet.GetByIndex(uint(idx))
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// Commit vote?
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if vote.Round < pol.Round {
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voteDoc = account.SignBytes(&types.Vote{
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Height: pol.Height, Round: vote.Round, Type: types.VoteTypeCommit,
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BlockHash: pol.BlockHash,
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BlockParts: pol.BlockParts,
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})
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} else if vote.Round > pol.Round {
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return Errorf("Invalid commit round %v for POL %v", vote.Round, pol)
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}
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// Validate
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if _, seen := seenValidators[string(val.Address)]; seen {
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return Errorf("Duplicate validator for vote %v for POL %v", vote, pol)
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}
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if !val.PubKey.VerifyBytes(voteDoc, vote.Signature) {
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return Errorf("Invalid signature for vote %v for POL %v", vote, pol)
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}
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// Tally
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seenValidators[string(val.Address)] = struct{}{}
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talliedVotingPower += val.VotingPower
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}
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if talliedVotingPower > valSet.TotalVotingPower()*2/3 {
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return nil
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} else {
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return Errorf("Invalid POL, insufficient voting power %v, needed %v",
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talliedVotingPower, (valSet.TotalVotingPower()*2/3 + 1))
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}
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}
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func (pol *POL) StringShort() string {
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if pol == nil {
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return "nil-POL"
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} else {
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return fmt.Sprintf("POL{H:%v R:%v BH:%X}", pol.Height, pol.Round,
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Fingerprint(pol.BlockHash), pol.BlockParts)
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}
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}
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