add a todo

Refs #1281

consensus/byzantine_test.go

@@ -46,9 +46,9 @@ func TestByzantine(t *testing.T) {
 	eventChans := make([]chan interface{}, N)
 	reactors := make([]p2p.Reactor, N)
 	for i := 0; i < N; i++ {
+		// make first val byzantine
 		if i == 0 {
 			css[i].privValidator = NewByzantinePrivValidator(css[i].privValidator)
-			// make byzantine
 			css[i].decideProposal = func(j int) func(int64, int) {
 				return func(height int64, round int) {
 					byzantineDecideProposalFunc(t, height, round, css[j], switches[j])
@@ -74,9 +74,11 @@ func TestByzantine(t *testing.T) {
 		var conRI p2p.Reactor // nolint: gotype, gosimple
 		conRI = conR
 
+		// make first val byzantine
 		if i == 0 {
 			conRI = NewByzantineReactor(conR)
 		}
+
 		reactors[i] = conRI
 	}
 
@@ -115,19 +117,19 @@ func TestByzantine(t *testing.T) {
 	// 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])
-
-	// connect the 2 peers in the larger partition
 	p2p.Connect2Switches(switches, ind1, ind2)
 
-	// wait for someone in the big partition to make a block
+	// wait for someone in the big partition (B) to make a block
 	<-eventChans[ind2]
 
 	t.Log("A block has been committed. Healing partition")
-
-	// connect the partitions
 	p2p.Connect2Switches(switches, ind0, ind1)
 	p2p.Connect2Switches(switches, ind0, ind2)
 

consensus/reactor.go

@@ -64,11 +64,6 @@ func (conR *ConsensusReactor) OnStart() error {
 		return err
 	}
 
-	err = conR.startPeerErrorsRoutine()
-	if err != nil {
-		return err
-	}
-
 	if !conR.FastSync() {
 		err := conR.conS.Start()
 		if err != nil {
@@ -345,39 +340,6 @@ func (conR *ConsensusReactor) FastSync() bool {
 
 //--------------------------------------
 
-// startPeerErrorsRoutine spawns a new gororoutine listening for errors from
-// consensus/state or other consensus modules.
-func (conR *ConsensusReactor) startPeerErrorsRoutine() error {
-	const subscriber = "consensus-reactor"
-	ctx := context.Background()
-
-	errorsCh := make(chan interface{})
-	err := conR.eventBus.Subscribe(ctx, subscriber, types.QueryForEvent(peerErrorEvent), errorsCh)
-	if err != nil {
-		return errors.Wrapf(err, "failed to subscribe %s to %s", subscriber, peerErrorEvent)
-	}
-
-	go func() {
-		for {
-			select {
-			case data, ok := <-errorsCh:
-				if ok {
-					pErr := data.(types.TMEventData).Unwrap().(peerError)
-					peer := conR.Switch.Peers().Get(pErr.peerID)
-					if peer != nil {
-						conR.Switch.StopPeerForError(peer, pErr.err)
-					}
-				}
-			case <-conR.Quit():
-				conR.eventBus.UnsubscribeAll(ctx, subscriber)
-				return
-			}
-		}
-	}()
-
-	return nil
-}
-
 // startBroadcastRoutine subscribes for new round steps, votes and proposal
 // heartbeats using the event bus and starts a go routine to broadcasts events
 // to peers upon receiving them.

consensus/state.go

@@ -63,19 +63,6 @@ func (ti *timeoutInfo) String() string {
 	return fmt.Sprintf("%v ; %d/%d %v", ti.Duration, ti.Height, ti.Round, ti.Step)
 }
 
-type peerError struct {
-	err    error
-	peerID p2p.ID
-}
-
-func (e peerError) Error() string {
-	return fmt.Sprintf("error with peer %v: %s", e.peerID, e.err.Error())
-}
-
-const (
-	peerErrorEvent = "cs.PeerError"
-)
-
 // ConsensusState handles execution of the consensus algorithm.
 // It processes votes and proposals, and upon reaching agreement,
 // commits blocks to the chain and executes them against the application.
@@ -596,8 +583,10 @@ func (cs *ConsensusState) handleMsg(mi msgInfo) {
 		err := cs.tryAddVote(msg.Vote, peerID)
 		if err == ErrAddingVote {
 			// TODO: punish peer
-			// breaks byzantine_test
-			// cs.eventBus.Publish(peerErrorEvent, types.TMEventData{peerError{err, peerID}})
+			// We probably don't want to stop the peer here. The vote does not
+			// necessarily comes from a malicious peer but can be just broadcasted by
+			// a typical peer.
+			// https://github.com/tendermint/tendermint/issues/1281
 		}
 
 		// NOTE: the vote is broadcast to peers by the reactor listening