forked from tendermint/tendermint
-
Notifications
You must be signed in to change notification settings - Fork 0
/
reactor.go
1238 lines (1086 loc) · 36.1 KB
/
reactor.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
package consensus
import (
"bytes"
"errors"
"fmt"
"reflect"
"sync"
"time"
wire "github.com/tendermint/go-wire"
"github.com/tendermint/tendermint/p2p"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
. "github.com/tendermint/tmlibs/common"
)
const (
StateChannel = byte(0x20)
DataChannel = byte(0x21)
VoteChannel = byte(0x22)
VoteSetBitsChannel = byte(0x23)
peerGossipSleepDuration = 100 * time.Millisecond // Time to sleep if there's nothing to send.
peerQueryMaj23SleepDuration = 2 * time.Second // Time to sleep after each VoteSetMaj23Message sent
maxConsensusMessageSize = 1048576 // 1MB; NOTE: keep in sync with types.PartSet sizes.
)
//-----------------------------------------------------------------------------
type ConsensusReactor struct {
p2p.BaseReactor // BaseService + p2p.Switch
conS *ConsensusState
fastSync bool
evsw types.EventSwitch
}
func NewConsensusReactor(consensusState *ConsensusState, fastSync bool) *ConsensusReactor {
conR := &ConsensusReactor{
conS: consensusState,
fastSync: fastSync,
}
conR.BaseReactor = *p2p.NewBaseReactor("ConsensusReactor", conR)
return conR
}
func (conR *ConsensusReactor) OnStart() error {
conR.Logger.Info("ConsensusReactor ", "fastSync", conR.fastSync)
conR.BaseReactor.OnStart()
// callbacks for broadcasting new steps and votes to peers
// upon their respective events (ie. uses evsw)
conR.registerEventCallbacks()
if !conR.fastSync {
_, err := conR.conS.Start()
if err != nil {
return err
}
}
return nil
}
func (conR *ConsensusReactor) OnStop() {
conR.BaseReactor.OnStop()
conR.conS.Stop()
}
// Switch from the fast_sync to the consensus:
// reset the state, turn off fast_sync, start the consensus-state-machine
func (conR *ConsensusReactor) SwitchToConsensus(state *sm.State) {
conR.Logger.Info("SwitchToConsensus")
conR.conS.reconstructLastCommit(state)
// NOTE: The line below causes broadcastNewRoundStepRoutine() to
// broadcast a NewRoundStepMessage.
conR.conS.updateToState(state)
conR.fastSync = false
conR.conS.Start()
}
// Implements Reactor
func (conR *ConsensusReactor) GetChannels() []*p2p.ChannelDescriptor {
// TODO optimize
return []*p2p.ChannelDescriptor{
&p2p.ChannelDescriptor{
ID: StateChannel,
Priority: 5,
SendQueueCapacity: 100,
},
&p2p.ChannelDescriptor{
ID: DataChannel, // maybe split between gossiping current block and catchup stuff
Priority: 10, // once we gossip the whole block there's nothing left to send until next height or round
SendQueueCapacity: 100,
RecvBufferCapacity: 50 * 4096,
},
&p2p.ChannelDescriptor{
ID: VoteChannel,
Priority: 5,
SendQueueCapacity: 100,
RecvBufferCapacity: 100 * 100,
},
&p2p.ChannelDescriptor{
ID: VoteSetBitsChannel,
Priority: 1,
SendQueueCapacity: 2,
RecvBufferCapacity: 1024,
},
}
}
// Implements Reactor
func (conR *ConsensusReactor) AddPeer(peer *p2p.Peer) {
if !conR.IsRunning() {
return
}
// Create peerState for peer
peerState := NewPeerState(peer)
peer.Data.Set(types.PeerStateKey, peerState)
// Begin routines for this peer.
go conR.gossipDataRoutine(peer, peerState)
go conR.gossipVotesRoutine(peer, peerState)
go conR.queryMaj23Routine(peer, peerState)
// Send our state to peer.
// If we're fast_syncing, broadcast a RoundStepMessage later upon SwitchToConsensus().
if !conR.fastSync {
conR.sendNewRoundStepMessages(peer)
}
}
// Implements Reactor
func (conR *ConsensusReactor) RemovePeer(peer *p2p.Peer, reason interface{}) {
if !conR.IsRunning() {
return
}
// TODO
//peer.Data.Get(PeerStateKey).(*PeerState).Disconnect()
}
// Implements Reactor
// NOTE: We process these messages even when we're fast_syncing.
// Messages affect either a peer state or the consensus state.
// Peer state updates can happen in parallel, but processing of
// proposals, block parts, and votes are ordered by the receiveRoutine
// NOTE: blocks on consensus state for proposals, block parts, and votes
func (conR *ConsensusReactor) Receive(chID byte, src *p2p.Peer, msgBytes []byte) {
if !conR.IsRunning() {
conR.Logger.Debug("Receive", "src", src, "chId", chID, "bytes", msgBytes)
return
}
_, msg, err := DecodeMessage(msgBytes)
if err != nil {
conR.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
// TODO punish peer?
return
}
conR.Logger.Debug("Receive", "src", src, "chId", chID, "msg", msg)
// Get peer states
ps := src.Data.Get(types.PeerStateKey).(*PeerState)
switch chID {
case StateChannel:
switch msg := msg.(type) {
case *NewRoundStepMessage:
ps.ApplyNewRoundStepMessage(msg)
case *CommitStepMessage:
ps.ApplyCommitStepMessage(msg)
case *HasVoteMessage:
ps.ApplyHasVoteMessage(msg)
case *VoteSetMaj23Message:
cs := conR.conS
cs.mtx.Lock()
height, votes := cs.Height, cs.Votes
cs.mtx.Unlock()
if height != msg.Height {
return
}
// Peer claims to have a maj23 for some BlockID at H,R,S,
votes.SetPeerMaj23(msg.Round, msg.Type, ps.Peer.Key, msg.BlockID)
// Respond with a VoteSetBitsMessage showing which votes we have.
// (and consequently shows which we don't have)
var ourVotes *BitArray
switch msg.Type {
case types.VoteTypePrevote:
ourVotes = votes.Prevotes(msg.Round).BitArrayByBlockID(msg.BlockID)
case types.VoteTypePrecommit:
ourVotes = votes.Precommits(msg.Round).BitArrayByBlockID(msg.BlockID)
default:
conR.Logger.Error("Bad VoteSetBitsMessage field Type")
return
}
src.TrySend(VoteSetBitsChannel, struct{ ConsensusMessage }{&VoteSetBitsMessage{
Height: msg.Height,
Round: msg.Round,
Type: msg.Type,
BlockID: msg.BlockID,
Votes: ourVotes,
}})
default:
conR.Logger.Error(Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
case DataChannel:
if conR.fastSync {
conR.Logger.Info("Ignoring message received during fastSync", "msg", msg)
return
}
switch msg := msg.(type) {
case *ProposalMessage:
ps.SetHasProposal(msg.Proposal)
conR.conS.peerMsgQueue <- msgInfo{msg, src.Key}
case *ProposalPOLMessage:
ps.ApplyProposalPOLMessage(msg)
case *BlockPartMessage:
ps.SetHasProposalBlockPart(msg.Height, msg.Round, msg.Part.Index)
conR.conS.peerMsgQueue <- msgInfo{msg, src.Key}
default:
conR.Logger.Error(Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
case VoteChannel:
if conR.fastSync {
conR.Logger.Info("Ignoring message received during fastSync", "msg", msg)
return
}
switch msg := msg.(type) {
case *VoteMessage:
cs := conR.conS
cs.mtx.Lock()
height, valSize, lastCommitSize := cs.Height, cs.Validators.Size(), cs.LastCommit.Size()
cs.mtx.Unlock()
ps.EnsureVoteBitArrays(height, valSize)
ps.EnsureVoteBitArrays(height-1, lastCommitSize)
ps.SetHasVote(msg.Vote)
conR.conS.peerMsgQueue <- msgInfo{msg, src.Key}
default:
// don't punish (leave room for soft upgrades)
conR.Logger.Error(Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
case VoteSetBitsChannel:
if conR.fastSync {
conR.Logger.Info("Ignoring message received during fastSync", "msg", msg)
return
}
switch msg := msg.(type) {
case *VoteSetBitsMessage:
cs := conR.conS
cs.mtx.Lock()
height, votes := cs.Height, cs.Votes
cs.mtx.Unlock()
if height == msg.Height {
var ourVotes *BitArray
switch msg.Type {
case types.VoteTypePrevote:
ourVotes = votes.Prevotes(msg.Round).BitArrayByBlockID(msg.BlockID)
case types.VoteTypePrecommit:
ourVotes = votes.Precommits(msg.Round).BitArrayByBlockID(msg.BlockID)
default:
conR.Logger.Error("Bad VoteSetBitsMessage field Type")
return
}
ps.ApplyVoteSetBitsMessage(msg, ourVotes)
} else {
ps.ApplyVoteSetBitsMessage(msg, nil)
}
default:
// don't punish (leave room for soft upgrades)
conR.Logger.Error(Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
default:
conR.Logger.Error(Fmt("Unknown chId %X", chID))
}
if err != nil {
conR.Logger.Error("Error in Receive()", "err", err)
}
}
// implements events.Eventable
func (conR *ConsensusReactor) SetEventSwitch(evsw types.EventSwitch) {
conR.evsw = evsw
conR.conS.SetEventSwitch(evsw)
}
//--------------------------------------
// Listens for new steps and votes,
// broadcasting the result to peers
func (conR *ConsensusReactor) registerEventCallbacks() {
types.AddListenerForEvent(conR.evsw, "conR", types.EventStringNewRoundStep(), func(data types.TMEventData) {
rs := data.Unwrap().(types.EventDataRoundState).RoundState.(*RoundState)
conR.broadcastNewRoundStep(rs)
})
types.AddListenerForEvent(conR.evsw, "conR", types.EventStringVote(), func(data types.TMEventData) {
edv := data.Unwrap().(types.EventDataVote)
conR.broadcastHasVoteMessage(edv.Vote)
})
}
func (conR *ConsensusReactor) broadcastNewRoundStep(rs *RoundState) {
nrsMsg, csMsg := makeRoundStepMessages(rs)
if nrsMsg != nil {
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{nrsMsg})
}
if csMsg != nil {
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{csMsg})
}
}
// Broadcasts HasVoteMessage to peers that care.
func (conR *ConsensusReactor) broadcastHasVoteMessage(vote *types.Vote) {
msg := &HasVoteMessage{
Height: vote.Height,
Round: vote.Round,
Type: vote.Type,
Index: vote.ValidatorIndex,
}
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{msg})
/*
// TODO: Make this broadcast more selective.
for _, peer := range conR.Switch.Peers().List() {
ps := peer.Data.Get(PeerStateKey).(*PeerState)
prs := ps.GetRoundState()
if prs.Height == vote.Height {
// TODO: Also filter on round?
peer.TrySend(StateChannel, struct{ ConsensusMessage }{msg})
} else {
// Height doesn't match
// TODO: check a field, maybe CatchupCommitRound?
// TODO: But that requires changing the struct field comment.
}
}
*/
}
func makeRoundStepMessages(rs *RoundState) (nrsMsg *NewRoundStepMessage, csMsg *CommitStepMessage) {
nrsMsg = &NewRoundStepMessage{
Height: rs.Height,
Round: rs.Round,
Step: rs.Step,
SecondsSinceStartTime: int(time.Since(rs.StartTime).Seconds()),
LastCommitRound: rs.LastCommit.Round(),
}
if rs.Step == RoundStepCommit {
csMsg = &CommitStepMessage{
Height: rs.Height,
BlockPartsHeader: rs.ProposalBlockParts.Header(),
BlockParts: rs.ProposalBlockParts.BitArray(),
}
}
return
}
func (conR *ConsensusReactor) sendNewRoundStepMessages(peer *p2p.Peer) {
rs := conR.conS.GetRoundState()
nrsMsg, csMsg := makeRoundStepMessages(rs)
if nrsMsg != nil {
peer.Send(StateChannel, struct{ ConsensusMessage }{nrsMsg})
}
if csMsg != nil {
peer.Send(StateChannel, struct{ ConsensusMessage }{csMsg})
}
}
func (conR *ConsensusReactor) gossipDataRoutine(peer *p2p.Peer, ps *PeerState) {
logger := conR.Logger.With("peer", peer)
OUTER_LOOP:
for {
// Manage disconnects from self or peer.
if !peer.IsRunning() || !conR.IsRunning() {
logger.Info("Stopping gossipDataRoutine for peer")
return
}
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
// Send proposal Block parts?
if rs.ProposalBlockParts.HasHeader(prs.ProposalBlockPartsHeader) {
//logger.Info("ProposalBlockParts matched", "blockParts", prs.ProposalBlockParts)
if index, ok := rs.ProposalBlockParts.BitArray().Sub(prs.ProposalBlockParts.Copy()).PickRandom(); ok {
part := rs.ProposalBlockParts.GetPart(index)
msg := &BlockPartMessage{
Height: rs.Height, // This tells peer that this part applies to us.
Round: rs.Round, // This tells peer that this part applies to us.
Part: part,
}
if peer.Send(DataChannel, struct{ ConsensusMessage }{msg}) {
ps.SetHasProposalBlockPart(prs.Height, prs.Round, index)
}
continue OUTER_LOOP
}
}
// If the peer is on a previous height, help catch up.
if (0 < prs.Height) && (prs.Height < rs.Height) {
//logger.Info("Data catchup", "height", rs.Height, "peerHeight", prs.Height, "peerProposalBlockParts", prs.ProposalBlockParts)
if index, ok := prs.ProposalBlockParts.Not().PickRandom(); ok {
// Ensure that the peer's PartSetHeader is correct
blockMeta := conR.conS.blockStore.LoadBlockMeta(prs.Height)
if blockMeta == nil {
logger.Error("Failed to load block meta", "peer height", prs.Height, "ourHeight", rs.Height, "blockstoreHeight", conR.conS.blockStore.Height(), "pv", conR.conS.privValidator)
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
} else if !blockMeta.BlockID.PartsHeader.Equals(prs.ProposalBlockPartsHeader) {
logger.Info("Peer ProposalBlockPartsHeader mismatch, sleeping",
"peerHeight", prs.Height, "blockPartsHeader", blockMeta.BlockID.PartsHeader, "peerBlockPartsHeader", prs.ProposalBlockPartsHeader)
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
}
// Load the part
part := conR.conS.blockStore.LoadBlockPart(prs.Height, index)
if part == nil {
logger.Error("Could not load part", "index", index,
"peerHeight", prs.Height, "blockPartsHeader", blockMeta.BlockID.PartsHeader, "peerBlockPartsHeader", prs.ProposalBlockPartsHeader)
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
}
// Send the part
msg := &BlockPartMessage{
Height: prs.Height, // Not our height, so it doesn't matter.
Round: prs.Round, // Not our height, so it doesn't matter.
Part: part,
}
if peer.Send(DataChannel, struct{ ConsensusMessage }{msg}) {
ps.SetHasProposalBlockPart(prs.Height, prs.Round, index)
}
continue OUTER_LOOP
} else {
//logger.Info("No parts to send in catch-up, sleeping")
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
}
}
// If height and round don't match, sleep.
if (rs.Height != prs.Height) || (rs.Round != prs.Round) {
//logger.Info("Peer Height|Round mismatch, sleeping", "peerHeight", prs.Height, "peerRound", prs.Round, "peer", peer)
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
}
// By here, height and round match.
// Proposal block parts were already matched and sent if any were wanted.
// (These can match on hash so the round doesn't matter)
// Now consider sending other things, like the Proposal itself.
// Send Proposal && ProposalPOL BitArray?
if rs.Proposal != nil && !prs.Proposal {
// Proposal: share the proposal metadata with peer.
{
msg := &ProposalMessage{Proposal: rs.Proposal}
if peer.Send(DataChannel, struct{ ConsensusMessage }{msg}) {
ps.SetHasProposal(rs.Proposal)
}
}
// ProposalPOL: lets peer know which POL votes we have so far.
// Peer must receive ProposalMessage first.
// rs.Proposal was validated, so rs.Proposal.POLRound <= rs.Round,
// so we definitely have rs.Votes.Prevotes(rs.Proposal.POLRound).
if 0 <= rs.Proposal.POLRound {
msg := &ProposalPOLMessage{
Height: rs.Height,
ProposalPOLRound: rs.Proposal.POLRound,
ProposalPOL: rs.Votes.Prevotes(rs.Proposal.POLRound).BitArray(),
}
peer.Send(DataChannel, struct{ ConsensusMessage }{msg})
}
continue OUTER_LOOP
}
// Nothing to do. Sleep.
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
}
}
func (conR *ConsensusReactor) gossipVotesRoutine(peer *p2p.Peer, ps *PeerState) {
logger := conR.Logger.With("peer", peer)
// Simple hack to throttle logs upon sleep.
var sleeping = 0
OUTER_LOOP:
for {
// Manage disconnects from self or peer.
if !peer.IsRunning() || !conR.IsRunning() {
logger.Info("Stopping gossipVotesRoutine for peer")
return
}
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
switch sleeping {
case 1: // First sleep
sleeping = 2
case 2: // No more sleep
sleeping = 0
}
//logger.Debug("gossipVotesRoutine", "rsHeight", rs.Height, "rsRound", rs.Round,
// "prsHeight", prs.Height, "prsRound", prs.Round, "prsStep", prs.Step)
// If height matches, then send LastCommit, Prevotes, Precommits.
if rs.Height == prs.Height {
// If there are lastCommits to send...
if prs.Step == RoundStepNewHeight {
if ps.PickSendVote(rs.LastCommit) {
logger.Debug("Picked rs.LastCommit to send")
continue OUTER_LOOP
}
}
// If there are prevotes to send...
if prs.Step <= RoundStepPrevote && prs.Round != -1 && prs.Round <= rs.Round {
if ps.PickSendVote(rs.Votes.Prevotes(prs.Round)) {
logger.Debug("Picked rs.Prevotes(prs.Round) to send")
continue OUTER_LOOP
}
}
// If there are precommits to send...
if prs.Step <= RoundStepPrecommit && prs.Round != -1 && prs.Round <= rs.Round {
if ps.PickSendVote(rs.Votes.Precommits(prs.Round)) {
logger.Debug("Picked rs.Precommits(prs.Round) to send")
continue OUTER_LOOP
}
}
// If there are POLPrevotes to send...
if prs.ProposalPOLRound != -1 {
if polPrevotes := rs.Votes.Prevotes(prs.ProposalPOLRound); polPrevotes != nil {
if ps.PickSendVote(polPrevotes) {
logger.Debug("Picked rs.Prevotes(prs.ProposalPOLRound) to send")
continue OUTER_LOOP
}
}
}
}
// Special catchup logic.
// If peer is lagging by height 1, send LastCommit.
if prs.Height != 0 && rs.Height == prs.Height+1 {
if ps.PickSendVote(rs.LastCommit) {
logger.Debug("Picked rs.LastCommit to send")
continue OUTER_LOOP
}
}
// Catchup logic
// If peer is lagging by more than 1, send Commit.
if prs.Height != 0 && rs.Height >= prs.Height+2 {
// Load the block commit for prs.Height,
// which contains precommit signatures for prs.Height.
commit := conR.conS.blockStore.LoadBlockCommit(prs.Height)
logger.Info("Loaded BlockCommit for catch-up", "height", prs.Height, "commit", commit)
if ps.PickSendVote(commit) {
logger.Debug("Picked Catchup commit to send")
continue OUTER_LOOP
}
}
if sleeping == 0 {
// We sent nothing. Sleep...
sleeping = 1
logger.Debug("No votes to send, sleeping",
"localPV", rs.Votes.Prevotes(rs.Round).BitArray(), "peerPV", prs.Prevotes,
"localPC", rs.Votes.Precommits(rs.Round).BitArray(), "peerPC", prs.Precommits)
} else if sleeping == 2 {
// Continued sleep...
sleeping = 1
}
time.Sleep(peerGossipSleepDuration)
continue OUTER_LOOP
}
}
// NOTE: `queryMaj23Routine` has a simple crude design since it only comes
// into play for liveness when there's a signature DDoS attack happening.
func (conR *ConsensusReactor) queryMaj23Routine(peer *p2p.Peer, ps *PeerState) {
logger := conR.Logger.With("peer", peer)
OUTER_LOOP:
for {
// Manage disconnects from self or peer.
if !peer.IsRunning() || !conR.IsRunning() {
logger.Info("Stopping queryMaj23Routine for peer")
return
}
// Maybe send Height/Round/Prevotes
{
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
if rs.Height == prs.Height {
if maj23, ok := rs.Votes.Prevotes(prs.Round).TwoThirdsMajority(); ok {
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: prs.Round,
Type: types.VoteTypePrevote,
BlockID: maj23,
}})
time.Sleep(peerQueryMaj23SleepDuration)
}
}
}
// Maybe send Height/Round/Precommits
{
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
if rs.Height == prs.Height {
if maj23, ok := rs.Votes.Precommits(prs.Round).TwoThirdsMajority(); ok {
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: prs.Round,
Type: types.VoteTypePrecommit,
BlockID: maj23,
}})
time.Sleep(peerQueryMaj23SleepDuration)
}
}
}
// Maybe send Height/Round/ProposalPOL
{
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
if rs.Height == prs.Height && prs.ProposalPOLRound >= 0 {
if maj23, ok := rs.Votes.Prevotes(prs.ProposalPOLRound).TwoThirdsMajority(); ok {
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: prs.ProposalPOLRound,
Type: types.VoteTypePrevote,
BlockID: maj23,
}})
time.Sleep(peerQueryMaj23SleepDuration)
}
}
}
// Little point sending LastCommitRound/LastCommit,
// These are fleeting and non-blocking.
// Maybe send Height/CatchupCommitRound/CatchupCommit.
{
prs := ps.GetRoundState()
if prs.CatchupCommitRound != -1 && 0 < prs.Height && prs.Height <= conR.conS.blockStore.Height() {
commit := conR.conS.LoadCommit(prs.Height)
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: commit.Round(),
Type: types.VoteTypePrecommit,
BlockID: commit.BlockID,
}})
time.Sleep(peerQueryMaj23SleepDuration)
}
}
time.Sleep(peerQueryMaj23SleepDuration)
continue OUTER_LOOP
}
}
func (conR *ConsensusReactor) String() string {
// better not to access shared variables
return "ConsensusReactor" // conR.StringIndented("")
}
func (conR *ConsensusReactor) StringIndented(indent string) string {
s := "ConsensusReactor{\n"
s += indent + " " + conR.conS.StringIndented(indent+" ") + "\n"
for _, peer := range conR.Switch.Peers().List() {
ps := peer.Data.Get(types.PeerStateKey).(*PeerState)
s += indent + " " + ps.StringIndented(indent+" ") + "\n"
}
s += indent + "}"
return s
}
//-----------------------------------------------------------------------------
// Read only when returned by PeerState.GetRoundState().
type PeerRoundState struct {
Height int // Height peer is at
Round int // Round peer is at, -1 if unknown.
Step RoundStepType // Step peer is at
StartTime time.Time // Estimated start of round 0 at this height
Proposal bool // True if peer has proposal for this round
ProposalBlockPartsHeader types.PartSetHeader //
ProposalBlockParts *BitArray //
ProposalPOLRound int // Proposal's POL round. -1 if none.
ProposalPOL *BitArray // nil until ProposalPOLMessage received.
Prevotes *BitArray // All votes peer has for this round
Precommits *BitArray // All precommits peer has for this round
LastCommitRound int // Round of commit for last height. -1 if none.
LastCommit *BitArray // All commit precommits of commit for last height.
CatchupCommitRound int // Round that we have commit for. Not necessarily unique. -1 if none.
CatchupCommit *BitArray // All commit precommits peer has for this height & CatchupCommitRound
}
func (prs PeerRoundState) String() string {
return prs.StringIndented("")
}
func (prs PeerRoundState) StringIndented(indent string) string {
return fmt.Sprintf(`PeerRoundState{
%s %v/%v/%v @%v
%s Proposal %v -> %v
%s POL %v (round %v)
%s Prevotes %v
%s Precommits %v
%s LastCommit %v (round %v)
%s Catchup %v (round %v)
%s}`,
indent, prs.Height, prs.Round, prs.Step, prs.StartTime,
indent, prs.ProposalBlockPartsHeader, prs.ProposalBlockParts,
indent, prs.ProposalPOL, prs.ProposalPOLRound,
indent, prs.Prevotes,
indent, prs.Precommits,
indent, prs.LastCommit, prs.LastCommitRound,
indent, prs.CatchupCommit, prs.CatchupCommitRound,
indent)
}
//-----------------------------------------------------------------------------
var (
ErrPeerStateHeightRegression = errors.New("Error peer state height regression")
ErrPeerStateInvalidStartTime = errors.New("Error peer state invalid startTime")
)
type PeerState struct {
Peer *p2p.Peer
mtx sync.Mutex
PeerRoundState
}
func NewPeerState(peer *p2p.Peer) *PeerState {
return &PeerState{
Peer: peer,
PeerRoundState: PeerRoundState{
Round: -1,
ProposalPOLRound: -1,
LastCommitRound: -1,
CatchupCommitRound: -1,
},
}
}
// Returns an atomic snapshot of the PeerRoundState.
// There's no point in mutating it since it won't change PeerState.
func (ps *PeerState) GetRoundState() *PeerRoundState {
ps.mtx.Lock()
defer ps.mtx.Unlock()
prs := ps.PeerRoundState // copy
return &prs
}
// Returns an atomic snapshot of the PeerRoundState's height
// used by the mempool to ensure peers are caught up before broadcasting new txs
func (ps *PeerState) GetHeight() int {
ps.mtx.Lock()
defer ps.mtx.Unlock()
return ps.PeerRoundState.Height
}
func (ps *PeerState) SetHasProposal(proposal *types.Proposal) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != proposal.Height || ps.Round != proposal.Round {
return
}
if ps.Proposal {
return
}
ps.Proposal = true
ps.ProposalBlockPartsHeader = proposal.BlockPartsHeader
ps.ProposalBlockParts = NewBitArray(proposal.BlockPartsHeader.Total)
ps.ProposalPOLRound = proposal.POLRound
ps.ProposalPOL = nil // Nil until ProposalPOLMessage received.
}
func (ps *PeerState) SetHasProposalBlockPart(height int, round int, index int) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != height || ps.Round != round {
return
}
ps.ProposalBlockParts.SetIndex(index, true)
}
// PickVoteToSend sends vote to peer.
// Returns true if vote was sent.
func (ps *PeerState) PickSendVote(votes types.VoteSetReader) (ok bool) {
if vote, ok := ps.PickVoteToSend(votes); ok {
msg := &VoteMessage{vote}
return ps.Peer.Send(VoteChannel, struct{ ConsensusMessage }{msg})
}
return false
}
// votes: Must be the correct Size() for the Height().
func (ps *PeerState) PickVoteToSend(votes types.VoteSetReader) (vote *types.Vote, ok bool) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if votes.Size() == 0 {
return nil, false
}
height, round, type_, size := votes.Height(), votes.Round(), votes.Type(), votes.Size()
// Lazily set data using 'votes'.
if votes.IsCommit() {
ps.ensureCatchupCommitRound(height, round, size)
}
ps.ensureVoteBitArrays(height, size)
psVotes := ps.getVoteBitArray(height, round, type_)
if psVotes == nil {
return nil, false // Not something worth sending
}
if index, ok := votes.BitArray().Sub(psVotes).PickRandom(); ok {
ps.setHasVote(height, round, type_, index)
return votes.GetByIndex(index), true
}
return nil, false
}
func (ps *PeerState) getVoteBitArray(height, round int, type_ byte) *BitArray {
if !types.IsVoteTypeValid(type_) {
PanicSanity("Invalid vote type")
}
if ps.Height == height {
if ps.Round == round {
switch type_ {
case types.VoteTypePrevote:
return ps.Prevotes
case types.VoteTypePrecommit:
return ps.Precommits
}
}
if ps.CatchupCommitRound == round {
switch type_ {
case types.VoteTypePrevote:
return nil
case types.VoteTypePrecommit:
return ps.CatchupCommit
}
}
if ps.ProposalPOLRound == round {
switch type_ {
case types.VoteTypePrevote:
return ps.ProposalPOL
case types.VoteTypePrecommit:
return nil
}
}
return nil
}
if ps.Height == height+1 {
if ps.LastCommitRound == round {
switch type_ {
case types.VoteTypePrevote:
return nil
case types.VoteTypePrecommit:
return ps.LastCommit
}
}
return nil
}
return nil
}
// 'round': A round for which we have a +2/3 commit.
func (ps *PeerState) ensureCatchupCommitRound(height, round int, numValidators int) {
if ps.Height != height {
return
}
/*
NOTE: This is wrong, 'round' could change.
e.g. if orig round is not the same as block LastCommit round.
if ps.CatchupCommitRound != -1 && ps.CatchupCommitRound != round {
PanicSanity(Fmt("Conflicting CatchupCommitRound. Height: %v, Orig: %v, New: %v", height, ps.CatchupCommitRound, round))
}
*/
if ps.CatchupCommitRound == round {
return // Nothing to do!
}
ps.CatchupCommitRound = round
if round == ps.Round {
ps.CatchupCommit = ps.Precommits
} else {
ps.CatchupCommit = NewBitArray(numValidators)
}
}
// NOTE: It's important to make sure that numValidators actually matches
// what the node sees as the number of validators for height.
func (ps *PeerState) EnsureVoteBitArrays(height int, numValidators int) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
ps.ensureVoteBitArrays(height, numValidators)
}
func (ps *PeerState) ensureVoteBitArrays(height int, numValidators int) {
if ps.Height == height {
if ps.Prevotes == nil {
ps.Prevotes = NewBitArray(numValidators)
}
if ps.Precommits == nil {
ps.Precommits = NewBitArray(numValidators)
}
if ps.CatchupCommit == nil {
ps.CatchupCommit = NewBitArray(numValidators)
}
if ps.ProposalPOL == nil {
ps.ProposalPOL = NewBitArray(numValidators)
}
} else if ps.Height == height+1 {
if ps.LastCommit == nil {
ps.LastCommit = NewBitArray(numValidators)
}
}
}
func (ps *PeerState) SetHasVote(vote *types.Vote) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
ps.setHasVote(vote.Height, vote.Round, vote.Type, vote.ValidatorIndex)
}
func (ps *PeerState) setHasVote(height int, round int, type_ byte, index int) {
logger := ps.Peer.Logger.With("peerRound", ps.Round, "height", height, "round", round)
logger.Debug("setHasVote(LastCommit)", "lastCommit", ps.LastCommit, "index", index)
// NOTE: some may be nil BitArrays -> no side effects.
ps.getVoteBitArray(height, round, type_).SetIndex(index, true)
}
func (ps *PeerState) ApplyNewRoundStepMessage(msg *NewRoundStepMessage) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
// Ignore duplicates or decreases
if CompareHRS(msg.Height, msg.Round, msg.Step, ps.Height, ps.Round, ps.Step) <= 0 {
return
}
// Just remember these values.
psHeight := ps.Height
psRound := ps.Round
//psStep := ps.Step
psCatchupCommitRound := ps.CatchupCommitRound
psCatchupCommit := ps.CatchupCommit
startTime := time.Now().Add(-1 * time.Duration(msg.SecondsSinceStartTime) * time.Second)
ps.Height = msg.Height
ps.Round = msg.Round
ps.Step = msg.Step
ps.StartTime = startTime
if psHeight != msg.Height || psRound != msg.Round {
ps.Proposal = false
ps.ProposalBlockPartsHeader = types.PartSetHeader{}
ps.ProposalBlockParts = nil
ps.ProposalPOLRound = -1
ps.ProposalPOL = nil
// We'll update the BitArray capacity later.
ps.Prevotes = nil
ps.Precommits = nil
}
if psHeight == msg.Height && psRound != msg.Round && msg.Round == psCatchupCommitRound {
// Peer caught up to CatchupCommitRound.
// Preserve psCatchupCommit!
// NOTE: We prefer to use prs.Precommits if
// pr.Round matches pr.CatchupCommitRound.
ps.Precommits = psCatchupCommit
}
if psHeight != msg.Height {