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220 lines
6.0 KiB
220 lines
6.0 KiB
package consensus
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import (
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"strings"
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"sync"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/tendermint/types"
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)
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type RoundVoteSet struct {
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Prevotes *types.VoteSet
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Precommits *types.VoteSet
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}
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/*
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Keeps track of all VoteSets from round 0 to round 'round'.
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Also keeps track of up to one RoundVoteSet greater than
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'round' from each peer, to facilitate catchup syncing of commits.
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A commit is +2/3 precommits for a block at a round,
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but which round is not known in advance, so when a peer
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provides a precommit for a round greater than mtx.round,
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we create a new entry in roundVoteSets but also remember the
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peer to prevent abuse.
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We let each peer provide us with up to 2 unexpected "catchup" rounds.
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One for their LastCommit round, and another for the official commit round.
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*/
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type HeightVoteSet struct {
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chainID string
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height int
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valSet *types.ValidatorSet
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mtx sync.Mutex
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round int // max tracked round
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roundVoteSets map[int]RoundVoteSet // keys: [0...round]
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peerCatchupRounds map[string][]int // keys: peer.Key; values: at most 2 rounds
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}
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func NewHeightVoteSet(chainID string, height int, valSet *types.ValidatorSet) *HeightVoteSet {
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hvs := &HeightVoteSet{
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chainID: chainID,
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}
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hvs.Reset(height, valSet)
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return hvs
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}
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func (hvs *HeightVoteSet) Reset(height int, valSet *types.ValidatorSet) {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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hvs.height = height
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hvs.valSet = valSet
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hvs.roundVoteSets = make(map[int]RoundVoteSet)
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hvs.peerCatchupRounds = make(map[string][]int)
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hvs.addRound(0)
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hvs.round = 0
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}
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func (hvs *HeightVoteSet) Height() int {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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return hvs.height
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}
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func (hvs *HeightVoteSet) Round() int {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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return hvs.round
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}
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// Create more RoundVoteSets up to round.
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func (hvs *HeightVoteSet) SetRound(round int) {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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if hvs.round != 0 && (round < hvs.round+1) {
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PanicSanity("SetRound() must increment hvs.round")
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}
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for r := hvs.round + 1; r <= round; r++ {
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if _, ok := hvs.roundVoteSets[r]; ok {
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continue // Already exists because peerCatchupRounds.
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}
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hvs.addRound(r)
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}
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hvs.round = round
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}
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func (hvs *HeightVoteSet) addRound(round int) {
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if _, ok := hvs.roundVoteSets[round]; ok {
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PanicSanity("addRound() for an existing round")
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}
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log.Debug("addRound(round)", "round", round)
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prevotes := types.NewVoteSet(hvs.chainID, hvs.height, round, types.VoteTypePrevote, hvs.valSet)
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precommits := types.NewVoteSet(hvs.chainID, hvs.height, round, types.VoteTypePrecommit, hvs.valSet)
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hvs.roundVoteSets[round] = RoundVoteSet{
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Prevotes: prevotes,
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Precommits: precommits,
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}
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}
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// Duplicate votes return added=false, err=nil.
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// By convention, peerKey is "" if origin is self.
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func (hvs *HeightVoteSet) AddVote(vote *types.Vote, peerKey string) (added bool, err error) {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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if !types.IsVoteTypeValid(vote.Type) {
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return
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}
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voteSet := hvs.getVoteSet(vote.Round, vote.Type)
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if voteSet == nil {
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if rndz := hvs.peerCatchupRounds[peerKey]; len(rndz) < 2 {
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hvs.addRound(vote.Round)
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voteSet = hvs.getVoteSet(vote.Round, vote.Type)
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hvs.peerCatchupRounds[peerKey] = append(rndz, vote.Round)
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} else {
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// Peer has sent a vote that does not match our round,
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// for more than one round. Bad peer!
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// TODO punish peer.
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log.Warn("Deal with peer giving votes from unwanted rounds")
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return
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}
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}
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added, err = voteSet.AddVote(vote)
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return
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}
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func (hvs *HeightVoteSet) Prevotes(round int) *types.VoteSet {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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return hvs.getVoteSet(round, types.VoteTypePrevote)
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}
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func (hvs *HeightVoteSet) Precommits(round int) *types.VoteSet {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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return hvs.getVoteSet(round, types.VoteTypePrecommit)
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}
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// Last round and blockID that has +2/3 prevotes for a particular block or nil.
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// Returns -1 if no such round exists.
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func (hvs *HeightVoteSet) POLInfo() (polRound int, polBlockID types.BlockID) {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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for r := hvs.round; r >= 0; r-- {
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rvs := hvs.getVoteSet(r, types.VoteTypePrevote)
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polBlockID, ok := rvs.TwoThirdsMajority()
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if ok {
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return r, polBlockID
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}
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}
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return -1, types.BlockID{}
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}
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func (hvs *HeightVoteSet) getVoteSet(round int, type_ byte) *types.VoteSet {
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rvs, ok := hvs.roundVoteSets[round]
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if !ok {
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return nil
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}
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switch type_ {
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case types.VoteTypePrevote:
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return rvs.Prevotes
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case types.VoteTypePrecommit:
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return rvs.Precommits
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default:
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PanicSanity(Fmt("Unexpected vote type %X", type_))
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return nil
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}
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}
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func (hvs *HeightVoteSet) String() string {
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return hvs.StringIndented("")
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}
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func (hvs *HeightVoteSet) StringIndented(indent string) string {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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vsStrings := make([]string, 0, (len(hvs.roundVoteSets)+1)*2)
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// rounds 0 ~ hvs.round inclusive
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for round := 0; round <= hvs.round; round++ {
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voteSetString := hvs.roundVoteSets[round].Prevotes.StringShort()
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vsStrings = append(vsStrings, voteSetString)
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voteSetString = hvs.roundVoteSets[round].Precommits.StringShort()
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vsStrings = append(vsStrings, voteSetString)
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}
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// all other peer catchup rounds
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for round, roundVoteSet := range hvs.roundVoteSets {
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if round <= hvs.round {
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continue
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}
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voteSetString := roundVoteSet.Prevotes.StringShort()
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vsStrings = append(vsStrings, voteSetString)
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voteSetString = roundVoteSet.Precommits.StringShort()
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vsStrings = append(vsStrings, voteSetString)
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}
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return Fmt(`HeightVoteSet{H:%v R:0~%v
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%s %v
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%s}`,
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hvs.height, hvs.round,
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indent, strings.Join(vsStrings, "\n"+indent+" "),
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indent)
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}
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// If a peer claims that it has 2/3 majority for given blockKey, call this.
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// NOTE: if there are too many peers, or too much peer churn,
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// this can cause memory issues.
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// TODO: implement ability to remove peers too
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func (hvs *HeightVoteSet) SetPeerMaj23(round int, type_ byte, peerID string, blockID types.BlockID) {
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hvs.mtx.Lock()
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defer hvs.mtx.Unlock()
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if !types.IsVoteTypeValid(type_) {
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return
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}
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voteSet := hvs.getVoteSet(round, type_)
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if voteSet == nil {
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return
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}
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voteSet.SetPeerMaj23(peerID, blockID)
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}
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