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179 lines
4.8 KiB
179 lines
4.8 KiB
package consensus
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import (
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"bytes"
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"sync"
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"time"
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. "github.com/tendermint/tendermint/blocks"
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. "github.com/tendermint/tendermint/common"
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. "github.com/tendermint/tendermint/state"
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)
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// VoteSet helps collect signatures from validators at each height+round
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// for a predefined vote type.
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// Note that there three kinds of votes: (bare) votes, precommits, and commits.
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// A commit of prior rounds can be added added in lieu of votes/precommits.
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// TODO: test majority calculations etc.
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type VoteSet struct {
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height uint32
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round uint16
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type_ byte
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mtx sync.Mutex
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vset *ValidatorSet
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votes map[uint64]*Vote
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votesBitArray BitArray
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votesByBlockHash map[string]uint64
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totalVotes uint64
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twoThirdsMajority []byte
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twoThirdsCommitTime time.Time
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}
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// Constructs a new VoteSet struct used to accumulate votes for each round.
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func NewVoteSet(height uint32, round uint16, type_ byte, vset *ValidatorSet) *VoteSet {
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if type_ == VoteTypeCommit && round != 0 {
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panic("Expected round 0 for commit vote set")
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}
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return &VoteSet{
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height: height,
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round: round,
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type_: type_,
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vset: vset,
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votes: make(map[uint64]*Vote, vset.Size()),
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votesBitArray: NewBitArray(vset.Size()),
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votesByBlockHash: make(map[string]uint64),
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totalVotes: 0,
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}
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}
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// True if added, false if not.
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// Returns ErrVote[UnexpectedPhase|InvalidAccount|InvalidSignature|InvalidBlockHash|ConflictingSignature]
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func (vs *VoteSet) AddVote(vote *Vote) (bool, error) {
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vs.mtx.Lock()
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defer vs.mtx.Unlock()
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// Make sure the phase matches. (or that vote is commit && round < vs.round)
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if vote.Height != vs.height ||
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(vote.Type != VoteTypeCommit && vote.Round != vs.round) ||
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(vote.Type != VoteTypeCommit && vote.Type != vs.type_) ||
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(vote.Type == VoteTypeCommit && vs.type_ != VoteTypeCommit && vote.Round >= vs.round) {
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return false, ErrVoteUnexpectedPhase
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}
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// Ensure that signer is a validator.
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_, val := vs.vset.GetById(vote.SignerId)
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if val == nil {
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return false, ErrVoteInvalidAccount
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}
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// Check signature.
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if !val.Verify(vote) {
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// Bad signature.
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return false, ErrVoteInvalidSignature
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}
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return vs.addVote(vote)
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}
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func (vs *VoteSet) addVote(vote *Vote) (bool, error) {
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// If vote already exists, return false.
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if existingVote, ok := vs.votes[vote.SignerId]; ok {
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if bytes.Equal(existingVote.BlockHash, vote.BlockHash) {
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return false, nil
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} else {
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return false, ErrVoteConflictingSignature
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}
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}
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// Add vote.
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vs.votes[vote.SignerId] = vote
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voterIndex, val := vs.vset.GetById(vote.SignerId)
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if val == nil {
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return false, ErrVoteInvalidAccount
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}
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vs.votesBitArray.SetIndex(uint(voterIndex), true)
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totalBlockHashVotes := vs.votesByBlockHash[string(vote.BlockHash)] + val.VotingPower
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vs.votesByBlockHash[string(vote.BlockHash)] = totalBlockHashVotes
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vs.totalVotes += val.VotingPower
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// If we just nudged it up to two thirds majority, add it.
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if totalBlockHashVotes > vs.vset.TotalVotingPower()*2/3 &&
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(totalBlockHashVotes-val.VotingPower) <= vs.vset.TotalVotingPower()*2/3 {
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vs.twoThirdsMajority = vote.BlockHash
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vs.twoThirdsCommitTime = time.Now()
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}
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return true, nil
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}
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// Assumes that commits VoteSet is valid.
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func (vs *VoteSet) AddVotesFromCommits(commits *VoteSet) {
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commitVotes := commits.AllVotes()
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for _, commit := range commitVotes {
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if commit.Round < vs.round {
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vs.addVote(commit)
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}
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}
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}
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func (vs *VoteSet) BitArray() BitArray {
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vs.mtx.Lock()
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defer vs.mtx.Unlock()
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return vs.votesBitArray.Copy()
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}
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func (vs *VoteSet) GetVote(id uint64) *Vote {
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vs.mtx.Lock()
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defer vs.mtx.Unlock()
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return vs.votes[id]
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}
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func (vs *VoteSet) AllVotes() []*Vote {
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vs.mtx.Lock()
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defer vs.mtx.Unlock()
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votes := []*Vote{}
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for _, vote := range vs.votes {
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votes = append(votes, vote)
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}
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return votes
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}
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// Returns either a blockhash (or nil) that received +2/3 majority.
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// If there exists no such majority, returns (nil, false).
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func (vs *VoteSet) TwoThirdsMajority() (hash []byte, commitTime time.Time, ok bool) {
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vs.mtx.Lock()
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defer vs.mtx.Unlock()
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if vs.twoThirdsCommitTime.IsZero() {
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return nil, time.Time{}, false
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}
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return vs.twoThirdsMajority, vs.twoThirdsCommitTime, true
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}
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func (vs *VoteSet) MakePOL() *POL {
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vs.mtx.Lock()
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defer vs.mtx.Unlock()
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if vs.twoThirdsCommitTime.IsZero() {
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return nil
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}
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majHash := vs.twoThirdsMajority // hash may be nil.
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pol := &POL{
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Height: vs.height,
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Round: vs.round,
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BlockHash: majHash,
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}
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for _, vote := range vs.votes {
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if bytes.Equal(vote.BlockHash, majHash) {
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if vote.Type == VoteTypeBare {
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pol.Votes = append(pol.Votes, vote.Signature)
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} else if vote.Type == VoteTypeCommit {
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pol.Commits = append(pol.Votes, vote.Signature)
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pol.CommitRounds = append(pol.CommitRounds, vote.Round)
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} else {
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Panicf("Unexpected vote type %X", vote.Type)
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}
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}
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}
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return pol
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}
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