You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
284 lines
7.9 KiB
284 lines
7.9 KiB
package consensus
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strings"
|
|
"sync"
|
|
|
|
"github.com/tendermint/tendermint/account"
|
|
"github.com/tendermint/tendermint/binary"
|
|
. "github.com/tendermint/tendermint/common"
|
|
sm "github.com/tendermint/tendermint/state"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
// VoteSet helps collect signatures from validators at each height+round
|
|
// for a predefined vote type.
|
|
// Note that there three kinds of votes: prevotes, precommits, and commits.
|
|
// A commit of prior rounds can be added added in lieu of votes/precommits.
|
|
// NOTE: Assumes that the sum total of voting power does not exceed MaxUInt64.
|
|
type VoteSet struct {
|
|
height uint
|
|
round uint
|
|
type_ byte
|
|
|
|
mtx sync.Mutex
|
|
valSet *sm.ValidatorSet
|
|
votes []*types.Vote // validator index -> vote
|
|
votesBitArray *BitArray // validator index -> has vote?
|
|
votesByBlock map[string]uint64 // string(blockHash)+string(blockParts) -> vote sum.
|
|
totalVotes uint64
|
|
maj23Hash []byte
|
|
maj23Parts types.PartSetHeader
|
|
maj23Exists bool
|
|
}
|
|
|
|
// Constructs a new VoteSet struct used to accumulate votes for given height/round.
|
|
func NewVoteSet(height uint, round uint, type_ byte, valSet *sm.ValidatorSet) *VoteSet {
|
|
if height == 0 {
|
|
panic("Cannot make VoteSet for height == 0, doesn't make sense.")
|
|
}
|
|
return &VoteSet{
|
|
height: height,
|
|
round: round,
|
|
type_: type_,
|
|
valSet: valSet,
|
|
votes: make([]*types.Vote, valSet.Size()),
|
|
votesBitArray: NewBitArray(valSet.Size()),
|
|
votesByBlock: make(map[string]uint64),
|
|
totalVotes: 0,
|
|
}
|
|
}
|
|
|
|
func (voteSet *VoteSet) Height() uint {
|
|
if voteSet == nil {
|
|
return 0
|
|
} else {
|
|
return voteSet.height
|
|
}
|
|
}
|
|
|
|
func (voteSet *VoteSet) Round() uint {
|
|
if voteSet == nil {
|
|
return 0
|
|
} else {
|
|
return voteSet.round
|
|
}
|
|
}
|
|
|
|
func (voteSet *VoteSet) Size() uint {
|
|
if voteSet == nil {
|
|
return 0
|
|
} else {
|
|
return voteSet.valSet.Size()
|
|
}
|
|
}
|
|
|
|
// Returns added=true, index if vote was added
|
|
// Otherwise returns err=ErrVote[UnexpectedStep|InvalidAccount|InvalidSignature|InvalidBlockHash|ConflictingSignature]
|
|
// Duplicate votes return added=false, err=nil.
|
|
// NOTE: vote should not be mutated after adding.
|
|
func (voteSet *VoteSet) AddByIndex(valIndex uint, vote *types.Vote) (added bool, index uint, err error) {
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
|
|
return voteSet.addByIndex(valIndex, vote)
|
|
}
|
|
|
|
// Returns added=true, index if vote was added
|
|
// Otherwise returns err=ErrVote[UnexpectedStep|InvalidAccount|InvalidSignature|InvalidBlockHash|ConflictingSignature]
|
|
// Duplicate votes return added=false, err=nil.
|
|
// NOTE: vote should not be mutated after adding.
|
|
func (voteSet *VoteSet) AddByAddress(address []byte, vote *types.Vote) (added bool, index uint, err error) {
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
|
|
// Ensure that signer is a validator.
|
|
valIndex, val := voteSet.valSet.GetByAddress(address)
|
|
if val == nil {
|
|
return false, 0, types.ErrVoteInvalidAccount
|
|
}
|
|
|
|
return voteSet.addVote(val, valIndex, vote)
|
|
}
|
|
|
|
func (voteSet *VoteSet) addByIndex(valIndex uint, vote *types.Vote) (bool, uint, error) {
|
|
// Ensure that signer is a validator.
|
|
_, val := voteSet.valSet.GetByIndex(valIndex)
|
|
if val == nil {
|
|
return false, 0, types.ErrVoteInvalidAccount
|
|
}
|
|
|
|
return voteSet.addVote(val, valIndex, vote)
|
|
}
|
|
|
|
func (voteSet *VoteSet) addVote(val *sm.Validator, valIndex uint, vote *types.Vote) (bool, uint, error) {
|
|
|
|
// Make sure the step matches. (or that vote is commit && round < voteSet.round)
|
|
if (vote.Height != voteSet.height) ||
|
|
(vote.Round != voteSet.round) ||
|
|
(vote.Type != voteSet.type_) {
|
|
return false, 0, types.ErrVoteUnexpectedStep
|
|
}
|
|
|
|
// Check signature.
|
|
if !val.PubKey.VerifyBytes(account.SignBytes(config.GetString("chain_id"), vote), vote.Signature) {
|
|
// Bad signature.
|
|
return false, 0, types.ErrVoteInvalidSignature
|
|
}
|
|
|
|
// If vote already exists, return false.
|
|
if existingVote := voteSet.votes[valIndex]; existingVote != nil {
|
|
if bytes.Equal(existingVote.BlockHash, vote.BlockHash) {
|
|
return false, valIndex, nil
|
|
} else {
|
|
return false, valIndex, &types.ErrVoteConflictingSignature{
|
|
VoteA: existingVote,
|
|
VoteB: vote,
|
|
}
|
|
}
|
|
}
|
|
|
|
// Add vote.
|
|
voteSet.votes[valIndex] = vote
|
|
voteSet.votesBitArray.SetIndex(valIndex, true)
|
|
blockKey := string(vote.BlockHash) + string(binary.BinaryBytes(vote.BlockParts))
|
|
totalBlockHashVotes := voteSet.votesByBlock[blockKey] + val.VotingPower
|
|
voteSet.votesByBlock[blockKey] = totalBlockHashVotes
|
|
voteSet.totalVotes += val.VotingPower
|
|
|
|
// If we just nudged it up to two thirds majority, add it.
|
|
if totalBlockHashVotes > voteSet.valSet.TotalVotingPower()*2/3 &&
|
|
(totalBlockHashVotes-val.VotingPower) <= voteSet.valSet.TotalVotingPower()*2/3 {
|
|
voteSet.maj23Hash = vote.BlockHash
|
|
voteSet.maj23Parts = vote.BlockParts
|
|
voteSet.maj23Exists = true
|
|
}
|
|
|
|
return true, valIndex, nil
|
|
}
|
|
|
|
func (voteSet *VoteSet) BitArray() *BitArray {
|
|
if voteSet == nil {
|
|
return nil
|
|
}
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
return voteSet.votesBitArray.Copy()
|
|
}
|
|
|
|
func (voteSet *VoteSet) GetByIndex(valIndex uint) *types.Vote {
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
return voteSet.votes[valIndex]
|
|
}
|
|
|
|
func (voteSet *VoteSet) GetByAddress(address []byte) *types.Vote {
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
valIndex, val := voteSet.valSet.GetByAddress(address)
|
|
if val == nil {
|
|
panic("GetByAddress(address) returned nil")
|
|
}
|
|
return voteSet.votes[valIndex]
|
|
}
|
|
|
|
func (voteSet *VoteSet) HasTwoThirdsMajority() bool {
|
|
if voteSet == nil {
|
|
return false
|
|
}
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
return voteSet.maj23Exists
|
|
}
|
|
|
|
func (voteSet *VoteSet) HasTwoThirdsAny() bool {
|
|
if voteSet == nil {
|
|
return false
|
|
}
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
return voteSet.totalVotes > voteSet.valSet.TotalVotingPower()*2/3
|
|
}
|
|
|
|
// Returns either a blockhash (or nil) that received +2/3 majority.
|
|
// If there exists no such majority, returns (nil, false).
|
|
func (voteSet *VoteSet) TwoThirdsMajority() (hash []byte, parts types.PartSetHeader, ok bool) {
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
if voteSet.maj23Exists {
|
|
return voteSet.maj23Hash, voteSet.maj23Parts, true
|
|
} else {
|
|
return nil, types.PartSetHeader{}, false
|
|
}
|
|
}
|
|
|
|
func (voteSet *VoteSet) String() string {
|
|
if voteSet == nil {
|
|
return "nil-VoteSet"
|
|
}
|
|
return voteSet.StringIndented("")
|
|
}
|
|
|
|
func (voteSet *VoteSet) StringIndented(indent string) string {
|
|
voteStrings := make([]string, len(voteSet.votes))
|
|
for i, vote := range voteSet.votes {
|
|
if vote == nil {
|
|
voteStrings[i] = "nil-Vote"
|
|
} else {
|
|
voteStrings[i] = vote.String()
|
|
}
|
|
}
|
|
return fmt.Sprintf(`VoteSet{
|
|
%s H:%v R:%v T:%v
|
|
%s %v
|
|
%s %v
|
|
%s}`,
|
|
indent, voteSet.height, voteSet.round, voteSet.type_,
|
|
indent, strings.Join(voteStrings, "\n"+indent+" "),
|
|
indent, voteSet.votesBitArray,
|
|
indent)
|
|
}
|
|
|
|
func (voteSet *VoteSet) StringShort() string {
|
|
if voteSet == nil {
|
|
return "nil-VoteSet"
|
|
}
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
return fmt.Sprintf(`VoteSet{H:%v R:%v T:%v +2/3:%v %v}`,
|
|
voteSet.height, voteSet.round, voteSet.type_, voteSet.maj23Exists, voteSet.votesBitArray)
|
|
}
|
|
|
|
//--------------------------------------------------------------------------------
|
|
// Validation
|
|
|
|
func (voteSet *VoteSet) MakeValidation() *types.Validation {
|
|
if voteSet.type_ != types.VoteTypePrecommit {
|
|
panic("Cannot MakeValidation() unless VoteSet.Type is types.VoteTypePrecommit")
|
|
}
|
|
voteSet.mtx.Lock()
|
|
defer voteSet.mtx.Unlock()
|
|
if len(voteSet.maj23Hash) == 0 {
|
|
panic("Cannot MakeValidation() unless a blockhash has +2/3")
|
|
}
|
|
precommits := make([]*types.Vote, voteSet.valSet.Size())
|
|
voteSet.valSet.Iterate(func(valIndex uint, val *sm.Validator) bool {
|
|
vote := voteSet.votes[valIndex]
|
|
if vote == nil {
|
|
return false
|
|
}
|
|
if !bytes.Equal(vote.BlockHash, voteSet.maj23Hash) {
|
|
return false
|
|
}
|
|
if !vote.BlockParts.Equals(voteSet.maj23Parts) {
|
|
return false
|
|
}
|
|
precommits[valIndex] = vote
|
|
return false
|
|
})
|
|
return &types.Validation{
|
|
Precommits: precommits,
|
|
}
|
|
}
|