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.
277 lines
8.0 KiB
277 lines
8.0 KiB
package consensus
|
|
|
|
import (
|
|
"sync"
|
|
"testing"
|
|
"time"
|
|
|
|
"github.com/tendermint/tendermint/config/tendermint_test"
|
|
|
|
. "github.com/tendermint/go-common"
|
|
cfg "github.com/tendermint/go-config"
|
|
"github.com/tendermint/go-crypto"
|
|
"github.com/tendermint/go-events"
|
|
"github.com/tendermint/go-p2p"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
func init() {
|
|
config = tendermint_test.ResetConfig("consensus_byzantine_test")
|
|
}
|
|
|
|
//----------------------------------------------
|
|
// byzantine failures
|
|
|
|
// 4 validators. 1 is byzantine. The other three are partitioned into A (1 val) and B (2 vals).
|
|
// byzantine validator sends conflicting proposals into A and B,
|
|
// and prevotes/precommits on both of them.
|
|
// B sees a commit, A doesn't.
|
|
// Byzantine validator refuses to prevote.
|
|
// Heal partition and ensure A sees the commit
|
|
func TestByzantine(t *testing.T) {
|
|
N := 4
|
|
css := randConsensusNet(N)
|
|
|
|
switches := make([]*p2p.Switch, N)
|
|
for i := 0; i < N; i++ {
|
|
switches[i] = p2p.NewSwitch(cfg.NewMapConfig(nil))
|
|
}
|
|
|
|
reactors := make([]p2p.Reactor, N)
|
|
eventChans := make([]chan interface{}, N)
|
|
for i := 0; i < N; i++ {
|
|
if i == 0 {
|
|
css[i].privValidator = NewByzantinePrivValidator(css[i].privValidator.(*types.PrivValidator))
|
|
// make byzantine
|
|
css[i].decideProposal = func(j int) func(int, int) {
|
|
return func(height, round int) {
|
|
byzantineDecideProposalFunc(height, round, css[j], switches[j])
|
|
}
|
|
}(i)
|
|
css[i].doPrevote = func(height, round int) {}
|
|
}
|
|
|
|
eventSwitch := events.NewEventSwitch()
|
|
_, err := eventSwitch.Start()
|
|
if err != nil {
|
|
t.Fatalf("Failed to start switch: %v", err)
|
|
}
|
|
eventChans[i] = subscribeToEvent(eventSwitch, "tester", types.EventStringNewBlock(), 1)
|
|
|
|
conR := NewConsensusReactor(css[i], false)
|
|
conR.SetEventSwitch(eventSwitch)
|
|
|
|
var conRI p2p.Reactor
|
|
conRI = conR
|
|
if i == 0 {
|
|
conRI = NewByzantineReactor(conR)
|
|
}
|
|
reactors[i] = conRI
|
|
}
|
|
|
|
p2p.MakeConnectedSwitches(N, func(i int, s *p2p.Switch) *p2p.Switch {
|
|
// ignore new switch s, we already made ours
|
|
switches[i].AddReactor("CONSENSUS", reactors[i])
|
|
return switches[i]
|
|
}, func(sws []*p2p.Switch, i, j int) {
|
|
// the network starts partitioned with globally active adversary
|
|
if i != 0 {
|
|
return
|
|
}
|
|
p2p.Connect2Switches(sws, i, j)
|
|
})
|
|
|
|
// byz proposer sends one block to peers[0]
|
|
// and the other block to peers[1] and peers[2].
|
|
// note peers and switches order don't match.
|
|
peers := switches[0].Peers().List()
|
|
ind0 := getSwitchIndex(switches, peers[0])
|
|
ind1 := getSwitchIndex(switches, peers[1])
|
|
ind2 := getSwitchIndex(switches, peers[2])
|
|
|
|
// connect the 2 peers in the larger partition
|
|
p2p.Connect2Switches(switches, ind1, ind2)
|
|
|
|
// wait for someone in the big partition to make a block
|
|
|
|
select {
|
|
case <-eventChans[ind2]:
|
|
}
|
|
|
|
log.Notice("A block has been committed. Healing partition")
|
|
|
|
// connect the partitions
|
|
p2p.Connect2Switches(switches, ind0, ind1)
|
|
p2p.Connect2Switches(switches, ind0, ind2)
|
|
|
|
// wait till everyone makes the first new block
|
|
// (one of them already has)
|
|
wg := new(sync.WaitGroup)
|
|
wg.Add(2)
|
|
for i := 1; i < N-1; i++ {
|
|
go func(j int) {
|
|
<-eventChans[j]
|
|
wg.Done()
|
|
}(i)
|
|
}
|
|
|
|
done := make(chan struct{})
|
|
go func() {
|
|
wg.Wait()
|
|
close(done)
|
|
}()
|
|
|
|
tick := time.NewTicker(time.Second * 10)
|
|
select {
|
|
case <-done:
|
|
case <-tick.C:
|
|
for i, reactor := range reactors {
|
|
t.Log(Fmt("Consensus Reactor %v", i))
|
|
t.Log(Fmt("%v", reactor))
|
|
}
|
|
t.Fatalf("Timed out waiting for all validators to commit first block")
|
|
}
|
|
}
|
|
|
|
//-------------------------------
|
|
// byzantine consensus functions
|
|
|
|
func byzantineDecideProposalFunc(height, round int, cs *ConsensusState, sw *p2p.Switch) {
|
|
// byzantine user should create two proposals and try to split the vote.
|
|
// Avoid sending on internalMsgQueue and running consensus state.
|
|
|
|
// Create a new proposal block from state/txs from the mempool.
|
|
block1, blockParts1 := cs.createProposalBlock()
|
|
polRound, polBlockID := cs.Votes.POLInfo()
|
|
proposal1 := types.NewProposal(height, round, blockParts1.Header(), polRound, polBlockID)
|
|
cs.privValidator.SignProposal(cs.state.ChainID, proposal1) // byzantine doesnt err
|
|
|
|
// Create a new proposal block from state/txs from the mempool.
|
|
block2, blockParts2 := cs.createProposalBlock()
|
|
polRound, polBlockID = cs.Votes.POLInfo()
|
|
proposal2 := types.NewProposal(height, round, blockParts2.Header(), polRound, polBlockID)
|
|
cs.privValidator.SignProposal(cs.state.ChainID, proposal2) // byzantine doesnt err
|
|
|
|
block1Hash := block1.Hash()
|
|
block2Hash := block2.Hash()
|
|
|
|
// broadcast conflicting proposals/block parts to peers
|
|
peers := sw.Peers().List()
|
|
log.Notice("Byzantine: broadcasting conflicting proposals", "peers", len(peers))
|
|
for i, peer := range peers {
|
|
if i < len(peers)/2 {
|
|
go sendProposalAndParts(height, round, cs, peer, proposal1, block1Hash, blockParts1)
|
|
} else {
|
|
go sendProposalAndParts(height, round, cs, peer, proposal2, block2Hash, blockParts2)
|
|
}
|
|
}
|
|
}
|
|
|
|
func sendProposalAndParts(height, round int, cs *ConsensusState, peer *p2p.Peer, proposal *types.Proposal, blockHash []byte, parts *types.PartSet) {
|
|
// proposal
|
|
msg := &ProposalMessage{Proposal: proposal}
|
|
peer.Send(DataChannel, struct{ ConsensusMessage }{msg})
|
|
|
|
// parts
|
|
for i := 0; i < parts.Total(); i++ {
|
|
part := parts.GetPart(i)
|
|
msg := &BlockPartMessage{
|
|
Height: height, // This tells peer that this part applies to us.
|
|
Round: round, // This tells peer that this part applies to us.
|
|
Part: part,
|
|
}
|
|
peer.Send(DataChannel, struct{ ConsensusMessage }{msg})
|
|
}
|
|
|
|
// votes
|
|
cs.mtx.Lock()
|
|
prevote, _ := cs.signVote(types.VoteTypePrevote, blockHash, parts.Header())
|
|
precommit, _ := cs.signVote(types.VoteTypePrecommit, blockHash, parts.Header())
|
|
cs.mtx.Unlock()
|
|
|
|
peer.Send(VoteChannel, struct{ ConsensusMessage }{&VoteMessage{prevote}})
|
|
peer.Send(VoteChannel, struct{ ConsensusMessage }{&VoteMessage{precommit}})
|
|
}
|
|
|
|
//----------------------------------------
|
|
// byzantine consensus reactor
|
|
|
|
type ByzantineReactor struct {
|
|
Service
|
|
reactor *ConsensusReactor
|
|
}
|
|
|
|
func NewByzantineReactor(conR *ConsensusReactor) *ByzantineReactor {
|
|
return &ByzantineReactor{
|
|
Service: conR,
|
|
reactor: conR,
|
|
}
|
|
}
|
|
|
|
func (br *ByzantineReactor) SetSwitch(s *p2p.Switch) { br.reactor.SetSwitch(s) }
|
|
func (br *ByzantineReactor) GetChannels() []*p2p.ChannelDescriptor { return br.reactor.GetChannels() }
|
|
func (br *ByzantineReactor) AddPeer(peer *p2p.Peer) {
|
|
if !br.reactor.IsRunning() {
|
|
return
|
|
}
|
|
|
|
// Create peerState for peer
|
|
peerState := NewPeerState(peer)
|
|
peer.Data.Set(types.PeerStateKey, peerState)
|
|
|
|
// Send our state to peer.
|
|
// If we're fast_syncing, broadcast a RoundStepMessage later upon SwitchToConsensus().
|
|
if !br.reactor.fastSync {
|
|
br.reactor.sendNewRoundStepMessage(peer)
|
|
}
|
|
}
|
|
func (br *ByzantineReactor) RemovePeer(peer *p2p.Peer, reason interface{}) {
|
|
br.reactor.RemovePeer(peer, reason)
|
|
}
|
|
func (br *ByzantineReactor) Receive(chID byte, peer *p2p.Peer, msgBytes []byte) {
|
|
br.reactor.Receive(chID, peer, msgBytes)
|
|
}
|
|
|
|
//----------------------------------------
|
|
// byzantine privValidator
|
|
|
|
type ByzantinePrivValidator struct {
|
|
Address []byte `json:"address"`
|
|
types.Signer `json:"-"`
|
|
|
|
mtx sync.Mutex
|
|
}
|
|
|
|
// Return a priv validator that will sign anything
|
|
func NewByzantinePrivValidator(pv *types.PrivValidator) *ByzantinePrivValidator {
|
|
return &ByzantinePrivValidator{
|
|
Address: pv.Address,
|
|
Signer: pv.Signer,
|
|
}
|
|
}
|
|
|
|
func (privVal *ByzantinePrivValidator) GetAddress() []byte {
|
|
return privVal.Address
|
|
}
|
|
|
|
func (privVal *ByzantinePrivValidator) SignVote(chainID string, vote *types.Vote) error {
|
|
privVal.mtx.Lock()
|
|
defer privVal.mtx.Unlock()
|
|
|
|
// Sign
|
|
vote.Signature = privVal.Sign(types.SignBytes(chainID, vote)).(crypto.SignatureEd25519)
|
|
return nil
|
|
}
|
|
|
|
func (privVal *ByzantinePrivValidator) SignProposal(chainID string, proposal *types.Proposal) error {
|
|
privVal.mtx.Lock()
|
|
defer privVal.mtx.Unlock()
|
|
|
|
// Sign
|
|
proposal.Signature = privVal.Sign(types.SignBytes(chainID, proposal)).(crypto.SignatureEd25519)
|
|
return nil
|
|
}
|
|
|
|
func (privVal *ByzantinePrivValidator) String() string {
|
|
return Fmt("PrivValidator{%X}", privVal.Address)
|
|
}
|