// Returns whether +2/3 have prevoted/committed for BlockHash.
func (pol *POL) Verify(valSet *sm.ValidatorSet) error {
if uint(len(pol.Votes)) != valSet.Size() {
return fmt.Errorf("Invalid POL votes count: Expected %v, got %v",
valSet.Size(), len(pol.Votes))
}
talliedVotingPower := uint64(0)
prevoteDoc := account.SignBytes(&types.Vote{
Height: pol.Height, Round: pol.Round, Type: types.VoteTypePrevote,
BlockHash: pol.BlockHash,
BlockParts: pol.BlockParts,
})
seenValidators := map[string]struct{}{}
for idx, vote := range pol.Votes {
// vote may be zero, in which case skip.
if vote.Signature.IsZero() {
continue
}
voteDoc := prevoteDoc
_, val := valSet.GetByIndex(uint(idx))
// Commit vote?
if vote.Round < pol.Round {
voteDoc = account.SignBytes(&types.Vote{
Height: pol.Height, Round: vote.Round, Type: types.VoteTypeCommit,
BlockHash: pol.BlockHash,
BlockParts: pol.BlockParts,
})
} else if vote.Round > pol.Round {
return fmt.Errorf("Invalid commit round %v for POL %v", vote.Round, pol)
}
// Validate
if _, seen := seenValidators[string(val.Address)]; seen {
return fmt.Errorf("Duplicate validator for vote %v for POL %v", vote, pol)
}
if !val.PubKey.VerifyBytes(voteDoc, vote.Signature) {
return fmt.Errorf("Invalid signature for vote %v for POL %v", vote, pol)
}
// Tally
seenValidators[string(val.Address)] = struct{}{}
talliedVotingPower += val.VotingPower
}
if talliedVotingPower > valSet.TotalVotingPower()*2/3 {
return nil
} else {
return fmt.Errorf("Invalid POL, insufficient voting power %v, needed %v",
talliedVotingPower, (valSet.TotalVotingPower()*2/3 + 1))
}
}
