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281 lines
7.8 KiB
281 lines
7.8 KiB
package consensus
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import (
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"bytes"
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"fmt"
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"strings"
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"sync"
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"github.com/tendermint/tendermint/account"
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"github.com/tendermint/tendermint/binary"
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blk "github.com/tendermint/tendermint/block"
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. "github.com/tendermint/tendermint/common"
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sm "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: prevotes, 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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// NOTE: Assumes that the sum total of voting power does not exceed MaxUInt64.
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type VoteSet struct {
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height uint
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round uint
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type_ byte
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mtx sync.Mutex
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valSet *sm.ValidatorSet
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votes []*blk.Vote // validator index -> vote
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votesBitArray BitArray // validator index -> has vote?
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votesByBlock map[string]uint64 // string(blockHash)+string(blockParts) -> vote sum.
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totalVotes uint64
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maj23Hash []byte
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maj23Parts blk.PartSetHeader
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maj23Exists bool
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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 uint, round uint, type_ byte, valSet *sm.ValidatorSet) *VoteSet {
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if height == 0 {
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panic("Cannot make VoteSet for height == 0, doesn't make sense.")
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}
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if type_ == blk.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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valSet: valSet,
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votes: make([]*blk.Vote, valSet.Size()),
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votesBitArray: NewBitArray(valSet.Size()),
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votesByBlock: make(map[string]uint64),
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totalVotes: 0,
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}
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}
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func (voteSet *VoteSet) Size() uint {
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if voteSet == nil {
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return 0
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} else {
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return voteSet.valSet.Size()
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}
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}
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// True if added, false if not.
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// Returns ErrVote[UnexpectedStep|InvalidAccount|InvalidSignature|InvalidBlockHash|ConflictingSignature]
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// NOTE: vote should not be mutated after adding.
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func (voteSet *VoteSet) Add(address []byte, vote *blk.Vote) (bool, uint, error) {
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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// Make sure the step matches. (or that vote is commit && round < voteSet.round)
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if vote.Height != voteSet.height ||
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(vote.Type != blk.VoteTypeCommit && vote.Round != voteSet.round) ||
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(vote.Type != blk.VoteTypeCommit && vote.Type != voteSet.type_) ||
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(vote.Type == blk.VoteTypeCommit && voteSet.type_ != blk.VoteTypeCommit && vote.Round >= voteSet.round) {
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return false, 0, blk.ErrVoteUnexpectedStep
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}
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// Ensure that signer is a validator.
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valIndex, val := voteSet.valSet.GetByAddress(address)
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if val == nil {
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return false, 0, blk.ErrVoteInvalidAccount
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}
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// Check signature.
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if !val.PubKey.VerifyBytes(account.SignBytes(vote), vote.Signature) {
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// Bad signature.
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return false, 0, blk.ErrVoteInvalidSignature
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}
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return voteSet.addVote(valIndex, vote)
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}
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func (voteSet *VoteSet) addVote(valIndex uint, vote *blk.Vote) (bool, uint, error) {
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// If vote already exists, return false.
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if existingVote := voteSet.votes[valIndex]; existingVote != nil {
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if bytes.Equal(existingVote.BlockHash, vote.BlockHash) {
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return false, 0, nil
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} else {
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return false, 0, blk.ErrVoteConflictingSignature
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}
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}
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// Add vote.
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_, val := voteSet.valSet.GetByIndex(valIndex)
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if val == nil {
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panic(fmt.Sprintf("Missing validator for index %v", valIndex))
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}
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voteSet.votes[valIndex] = vote
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voteSet.votesBitArray.SetIndex(valIndex, true)
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blockKey := string(vote.BlockHash) + string(binary.BinaryBytes(vote.BlockParts))
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totalBlockHashVotes := voteSet.votesByBlock[blockKey] + val.VotingPower
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voteSet.votesByBlock[blockKey] = totalBlockHashVotes
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voteSet.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 > voteSet.valSet.TotalVotingPower()*2/3 &&
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(totalBlockHashVotes-val.VotingPower) <= voteSet.valSet.TotalVotingPower()*2/3 {
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voteSet.maj23Hash = vote.BlockHash
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voteSet.maj23Parts = vote.BlockParts
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voteSet.maj23Exists = true
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}
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return true, valIndex, nil
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}
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// Assumes that commits VoteSet is valid.
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func (voteSet *VoteSet) AddFromCommits(commits *VoteSet) {
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for valIndex, commit := range commits.votes {
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if commit == nil {
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continue
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}
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if commit.Round < voteSet.round {
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voteSet.addVote(uint(valIndex), commit)
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}
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}
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}
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func (voteSet *VoteSet) BitArray() BitArray {
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if voteSet == nil {
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return BitArray{}
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}
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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return voteSet.votesBitArray.Copy()
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}
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func (voteSet *VoteSet) GetByIndex(valIndex uint) *blk.Vote {
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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return voteSet.votes[valIndex]
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}
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func (voteSet *VoteSet) GetByAddress(address []byte) *blk.Vote {
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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valIndex, val := voteSet.valSet.GetByAddress(address)
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if val == nil {
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panic("GetByAddress(address) returned nil")
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}
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return voteSet.votes[valIndex]
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}
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func (voteSet *VoteSet) HasTwoThirdsMajority() bool {
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if voteSet == nil {
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return false
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}
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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return voteSet.maj23Exists
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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 (voteSet *VoteSet) TwoThirdsMajority() (hash []byte, parts blk.PartSetHeader, ok bool) {
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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if voteSet.maj23Exists {
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return voteSet.maj23Hash, voteSet.maj23Parts, true
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} else {
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return nil, blk.PartSetHeader{}, false
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}
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}
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func (voteSet *VoteSet) MakePOL() *POL {
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if voteSet.type_ != blk.VoteTypePrevote {
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panic("Cannot MakePOL() unless VoteSet.Type is blk.VoteTypePrevote")
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}
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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if !voteSet.maj23Exists {
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return nil
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}
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pol := &POL{
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Height: voteSet.height,
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Round: voteSet.round,
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BlockHash: voteSet.maj23Hash,
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BlockParts: voteSet.maj23Parts,
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Votes: make([]POLVoteSignature, voteSet.valSet.Size()),
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}
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for valIndex, vote := range voteSet.votes {
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if vote == nil {
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continue
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}
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if !bytes.Equal(vote.BlockHash, voteSet.maj23Hash) {
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continue
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}
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if !vote.BlockParts.Equals(voteSet.maj23Parts) {
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continue
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}
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pol.Votes[valIndex] = POLVoteSignature{
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Round: vote.Round,
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Signature: vote.Signature,
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}
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}
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return pol
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}
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func (voteSet *VoteSet) MakeValidation() *blk.Validation {
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if voteSet.type_ != blk.VoteTypeCommit {
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panic("Cannot MakeValidation() unless VoteSet.Type is blk.VoteTypeCommit")
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}
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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if len(voteSet.maj23Hash) == 0 {
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panic("Cannot MakeValidation() unless a blockhash has +2/3")
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}
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commits := make([]blk.Commit, voteSet.valSet.Size())
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voteSet.valSet.Iterate(func(valIndex uint, val *sm.Validator) bool {
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vote := voteSet.votes[valIndex]
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if vote == nil {
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return false
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}
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if !bytes.Equal(vote.BlockHash, voteSet.maj23Hash) {
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return false
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}
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if !vote.BlockParts.Equals(voteSet.maj23Parts) {
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return false
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}
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commits[valIndex] = blk.Commit{val.Address, vote.Round, vote.Signature}
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return false
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})
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return &blk.Validation{
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Commits: commits,
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}
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}
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func (voteSet *VoteSet) String() string {
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return voteSet.StringIndented("")
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}
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func (voteSet *VoteSet) StringIndented(indent string) string {
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voteStrings := make([]string, len(voteSet.votes))
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for i, vote := range voteSet.votes {
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if vote == nil {
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voteStrings[i] = "nil-Vote"
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} else {
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voteStrings[i] = vote.String()
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}
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}
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return fmt.Sprintf(`VoteSet{
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%s H:%v R:%v T:%v
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%s %v
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%s %v
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%s}`,
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indent, voteSet.height, voteSet.round, voteSet.type_,
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indent, strings.Join(voteStrings, "\n"+indent+" "),
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indent, voteSet.votesBitArray,
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indent)
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}
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func (voteSet *VoteSet) StringShort() string {
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if voteSet == nil {
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return "nil-VoteSet"
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}
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voteSet.mtx.Lock()
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defer voteSet.mtx.Unlock()
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return fmt.Sprintf(`VoteSet{H:%v R:%v T:%v %v}`,
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voteSet.height, voteSet.round, voteSet.type_, voteSet.votesBitArray)
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}
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