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package consensus
import (
"context"
"fmt"
"sync"
"testing"
"time"
"github.com/stretchr/testify/require"
cmn "github.com/tendermint/tendermint/libs/common"
"github.com/tendermint/tendermint/p2p"
"github.com/tendermint/tendermint/types"
)
//----------------------------------------------
// 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
logger := consensusLogger().With("test", "byzantine")
css, cleanup := randConsensusNet(N, "consensus_byzantine_test", newMockTickerFunc(false), newCounter)
defer cleanup()
// give the byzantine validator a normal ticker
ticker := NewTimeoutTicker()
ticker.SetLogger(css[0].Logger)
css[0].SetTimeoutTicker(ticker)
switches := make([]*p2p.Switch, N)
p2pLogger := logger.With("module", "p2p")
for i := 0; i < N; i++ {
switches[i] = p2p.MakeSwitch(
config.P2P,
i,
"foo", "1.0.0",
func(i int, sw *p2p.Switch) *p2p.Switch {
return sw
})
switches[i].SetLogger(p2pLogger.With("validator", i))
}
eventChans := make([]chan interface{}, N)
reactors := make([]p2p.Reactor, N)
for i := 0; i < N; i++ {
// make first val byzantine
if i == 0 {
// NOTE: Now, test validators are MockPV, which by default doesn't
// do any safety checks.
css[i].privValidator.(*types.MockPV).DisableChecks()
css[i].decideProposal = func(j int) func(int64, int) {
return func(height int64, round int) {
byzantineDecideProposalFunc(t, height, round, css[j], switches[j])
}
}(i)
css[i].doPrevote = func(height int64, round int) {}
}
eventBus := css[i].eventBus
eventBus.SetLogger(logger.With("module", "events", "validator", i))
eventChans[i] = make(chan interface{}, 1)
err := eventBus.Subscribe(context.Background(), testSubscriber, types.EventQueryNewBlock, eventChans[i])
require.NoError(t, err)
conR := NewConsensusReactor(css[i], true) // so we dont start the consensus states
conR.SetLogger(logger.With("validator", i))
conR.SetEventBus(eventBus)
var conRI p2p.Reactor = conR
// make first val byzantine
if i == 0 {
conRI = NewByzantineReactor(conR)
}
reactors[i] = conRI
}
defer func() {
for _, r := range reactors {
if rr, ok := r.(*ByzantineReactor); ok {
rr.reactor.Switch.Stop()
} else {
r.(*ConsensusReactor).Switch.Stop()
}
}
}()
p2p.MakeConnectedSwitches(config.P2P, 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)
})
// start the non-byz state machines.
// note these must be started before the byz
for i := 1; i < N; i++ {
cr := reactors[i].(*ConsensusReactor)
cr.SwitchToConsensus(cr.conS.GetState(), 0)
}
// start the byzantine state machine
byzR := reactors[0].(*ByzantineReactor)
s := byzR.reactor.conS.GetState()
byzR.reactor.SwitchToConsensus(s, 0)
// 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()
// partition A
ind0 := getSwitchIndex(switches, peers[0])
// partition B
ind1 := getSwitchIndex(switches, peers[1])
ind2 := getSwitchIndex(switches, peers[2])
p2p.Connect2Switches(switches, ind1, ind2)
// wait for someone in the big partition (B) to make a block
<-eventChans[ind2]
t.Log("A block has been committed. Healing partition")
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.Sprintf("Consensus Reactor %v", i))
t.Log(fmt.Sprintf("%v", reactor))
}
t.Fatalf("Timed out waiting for all validators to commit first block")
}
}
//-------------------------------
// byzantine consensus functions
func byzantineDecideProposalFunc(t *testing.T, height int64, 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, propBlockID := cs.ValidRound, types.BlockID{block1.Hash(), blockParts1.Header()}
proposal1 := types.NewProposal(height, round, polRound, propBlockID)
if err := cs.privValidator.SignProposal(cs.state.ChainID, proposal1); err != nil {
t.Error(err)
}
// Create a new proposal block from state/txs from the mempool.
block2, blockParts2 := cs.createProposalBlock()
polRound, propBlockID = cs.ValidRound, types.BlockID{block2.Hash(), blockParts2.Header()}
proposal2 := types.NewProposal(height, round, polRound, propBlockID)
if err := cs.privValidator.SignProposal(cs.state.ChainID, proposal2); err != nil {
t.Error(err)
}
block1Hash := block1.Hash()
block2Hash := block2.Hash()
// broadcast conflicting proposals/block parts to peers
peers := sw.Peers().List()
t.Logf("Byzantine: broadcasting conflicting proposals to %d 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 int64, round int, cs *ConsensusState, peer p2p.Peer, proposal *types.Proposal, blockHash []byte, parts *types.PartSet) {
// proposal
msg := &ProposalMessage{Proposal: proposal}
peer.Send(DataChannel, cdc.MustMarshalBinaryBare(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, cdc.MustMarshalBinaryBare(msg))
}
// votes
cs.mtx.Lock()
prevote, _ := cs.signVote(types.PrevoteType, blockHash, parts.Header())
precommit, _ := cs.signVote(types.PrecommitType, blockHash, parts.Header())
cs.mtx.Unlock()
peer.Send(VoteChannel, cdc.MustMarshalBinaryBare(&VoteMessage{prevote}))
peer.Send(VoteChannel, cdc.MustMarshalBinaryBare(&VoteMessage{precommit}))
}
//----------------------------------------
// byzantine consensus reactor
type ByzantineReactor struct {
cmn.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).SetLogger(br.reactor.Logger)
peer.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)
}