-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
store.go
1284 lines (1065 loc) · 34.2 KB
/
store.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 store
import (
"bytes"
"context"
"encoding/json"
"errors"
"os"
"strconv"
"strings"
"sync"
"time"
lru "github.com/hashicorp/golang-lru/v2"
block "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
dstore "github.com/ipfs/go-datastore"
"github.com/ipfs/go-datastore/query"
cbor "github.com/ipfs/go-ipld-cbor"
logging "github.com/ipfs/go-log/v2"
"go.opencensus.io/stats"
"go.opencensus.io/trace"
"go.uber.org/multierr"
"golang.org/x/sync/errgroup"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/pubsub"
"github.com/filecoin-project/lotus/api"
bstore "github.com/filecoin-project/lotus/blockstore"
"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/chain/actors/adt"
"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/lotus/journal"
"github.com/filecoin-project/lotus/metrics"
)
var log = logging.Logger("chainstore")
var (
chainHeadKey = dstore.NewKey("head")
checkpointKey = dstore.NewKey("/chain/checks")
blockValidationCacheKeyPrefix = dstore.NewKey("blockValidation")
)
var DefaultTipSetCacheSize = 8192
var DefaultMsgMetaCacheSize = 2048
var ErrNotifeeDone = errors.New("notifee is done and should be removed")
func init() {
if s := os.Getenv("LOTUS_CHAIN_TIPSET_CACHE"); s != "" {
tscs, err := strconv.Atoi(s)
if err != nil {
log.Errorf("failed to parse 'LOTUS_CHAIN_TIPSET_CACHE' env var: %s", err)
}
DefaultTipSetCacheSize = tscs
}
if s := os.Getenv("LOTUS_CHAIN_MSGMETA_CACHE"); s != "" {
mmcs, err := strconv.Atoi(s)
if err != nil {
log.Errorf("failed to parse 'LOTUS_CHAIN_MSGMETA_CACHE' env var: %s", err)
}
DefaultMsgMetaCacheSize = mmcs
}
}
// ReorgNotifee represents a callback that gets called upon reorgs.
type ReorgNotifee = func(rev, app []*types.TipSet) error
// Journal event types.
const (
evtTypeHeadChange = iota
)
type HeadChangeEvt struct {
From types.TipSetKey
FromHeight abi.ChainEpoch
To types.TipSetKey
ToHeight abi.ChainEpoch
RevertCount int
ApplyCount int
}
type WeightFunc func(ctx context.Context, stateBs bstore.Blockstore, ts *types.TipSet) (types.BigInt, error)
// ChainStore is the main point of access to chain data.
//
// Raw chain data is stored in the Blockstore, with relevant markers (genesis,
// latest head tipset references) being tracked in the Datastore (key-value
// store).
//
// To alleviate disk access, the ChainStore has two ARC caches:
// 1. a tipset cache
// 2. a block => messages references cache.
type ChainStore struct {
chainBlockstore bstore.Blockstore
stateBlockstore bstore.Blockstore
metadataDs dstore.Batching
weight WeightFunc
chainLocalBlockstore bstore.Blockstore
heaviestLk sync.RWMutex
heaviest *types.TipSet
checkpoint *types.TipSet
bestTips *pubsub.PubSub
pubLk sync.Mutex
tstLk sync.Mutex
tipsets map[abi.ChainEpoch][]cid.Cid
cindex *ChainIndex
reorgCh chan<- reorg
reorgNotifeeCh chan ReorgNotifee
mmCache *lru.ARCCache[cid.Cid, mmCids]
tsCache *lru.ARCCache[types.TipSetKey, *types.TipSet]
evtTypes [1]journal.EventType
journal journal.Journal
storeEvents bool
cancelFn context.CancelFunc
wg sync.WaitGroup
}
func NewChainStore(chainBs bstore.Blockstore, stateBs bstore.Blockstore, ds dstore.Batching, weight WeightFunc, j journal.Journal) *ChainStore {
c, _ := lru.NewARC[cid.Cid, mmCids](DefaultMsgMetaCacheSize)
tsc, _ := lru.NewARC[types.TipSetKey, *types.TipSet](DefaultTipSetCacheSize)
if j == nil {
j = journal.NilJournal()
}
ctx, cancel := context.WithCancel(context.Background())
// unwraps the fallback store in case one is configured.
// some methods _need_ to operate on a local blockstore only.
localbs, _ := bstore.UnwrapFallbackStore(chainBs)
cs := &ChainStore{
chainBlockstore: chainBs,
stateBlockstore: stateBs,
chainLocalBlockstore: localbs,
weight: weight,
metadataDs: ds,
bestTips: pubsub.New(64),
tipsets: make(map[abi.ChainEpoch][]cid.Cid),
mmCache: c,
tsCache: tsc,
cancelFn: cancel,
journal: j,
}
cs.evtTypes = [1]journal.EventType{
evtTypeHeadChange: j.RegisterEventType("sync", "head_change"),
}
ci := NewChainIndex(cs.LoadTipSet)
cs.cindex = ci
hcnf := func(rev, app []*types.TipSet) error {
cs.pubLk.Lock()
defer cs.pubLk.Unlock()
notif := make([]*api.HeadChange, len(rev)+len(app))
for i, r := range rev {
notif[i] = &api.HeadChange{
Type: HCRevert,
Val: r,
}
}
for i, r := range app {
notif[i+len(rev)] = &api.HeadChange{
Type: HCApply,
Val: r,
}
}
cs.bestTips.Pub(notif, "headchange")
return nil
}
hcmetric := func(rev, app []*types.TipSet) error {
for _, r := range app {
stats.Record(context.Background(), metrics.ChainNodeHeight.M(int64(r.Height())))
}
return nil
}
cs.reorgNotifeeCh = make(chan ReorgNotifee)
cs.reorgCh = cs.reorgWorker(ctx, []ReorgNotifee{hcnf, hcmetric})
return cs
}
func (cs *ChainStore) Close() error {
cs.cancelFn()
cs.wg.Wait()
return nil
}
func (cs *ChainStore) Load(ctx context.Context) error {
if err := cs.loadHead(ctx); err != nil {
return err
}
if err := cs.loadCheckpoint(ctx); err != nil {
return err
}
return nil
}
func (cs *ChainStore) loadHead(ctx context.Context) error {
head, err := cs.metadataDs.Get(ctx, chainHeadKey)
if err == dstore.ErrNotFound {
log.Warn("no previous chain state found")
return nil
}
if err != nil {
return xerrors.Errorf("failed to load chain state from datastore: %w", err)
}
var tscids []cid.Cid
if err := json.Unmarshal(head, &tscids); err != nil {
return xerrors.Errorf("failed to unmarshal stored chain head: %w", err)
}
ts, err := cs.LoadTipSet(ctx, types.NewTipSetKey(tscids...))
if err != nil {
return xerrors.Errorf("loading tipset: %w", err)
}
cs.heaviest = ts
return nil
}
func (cs *ChainStore) loadCheckpoint(ctx context.Context) error {
tskBytes, err := cs.metadataDs.Get(ctx, checkpointKey)
if err == dstore.ErrNotFound {
return nil
}
if err != nil {
return xerrors.Errorf("failed to load checkpoint from datastore: %w", err)
}
var tsk types.TipSetKey
err = json.Unmarshal(tskBytes, &tsk)
if err != nil {
return err
}
ts, err := cs.LoadTipSet(ctx, tsk)
if err != nil {
return xerrors.Errorf("loading tipset: %w", err)
}
cs.checkpoint = ts
return nil
}
func (cs *ChainStore) writeHead(ctx context.Context, ts *types.TipSet) error {
data, err := json.Marshal(ts.Cids())
if err != nil {
return xerrors.Errorf("failed to marshal tipset: %w", err)
}
if err := cs.metadataDs.Put(ctx, chainHeadKey, data); err != nil {
return xerrors.Errorf("failed to write chain head to datastore: %w", err)
}
return nil
}
const (
HCRevert = "revert"
HCApply = "apply"
HCCurrent = "current"
)
func (cs *ChainStore) SubHeadChanges(ctx context.Context) chan []*api.HeadChange {
cs.pubLk.Lock()
subch := cs.bestTips.Sub("headchange")
head := cs.GetHeaviestTipSet()
cs.pubLk.Unlock()
out := make(chan []*api.HeadChange, 16)
out <- []*api.HeadChange{{
Type: HCCurrent,
Val: head,
}}
go func() {
defer func() {
// Tell the caller we're done first, the following may block for a bit.
close(out)
// Unsubscribe.
cs.bestTips.Unsub(subch)
// Drain the channel.
for range subch {
}
}()
for {
select {
case val, ok := <-subch:
if !ok {
// Shutting down.
return
}
select {
case out <- val.([]*api.HeadChange):
default:
log.Errorf("closing head change subscription due to slow reader")
return
}
if len(out) > 5 {
log.Warnf("head change sub is slow, has %d buffered entries", len(out))
}
case <-ctx.Done():
return
}
}
}()
return out
}
func (cs *ChainStore) SubscribeHeadChanges(f ReorgNotifee) {
cs.reorgNotifeeCh <- f
}
func (cs *ChainStore) IsBlockValidated(ctx context.Context, blkid cid.Cid) (bool, error) {
key := blockValidationCacheKeyPrefix.Instance(blkid.String())
return cs.metadataDs.Has(ctx, key)
}
func (cs *ChainStore) MarkBlockAsValidated(ctx context.Context, blkid cid.Cid) error {
key := blockValidationCacheKeyPrefix.Instance(blkid.String())
if err := cs.metadataDs.Put(ctx, key, []byte{0}); err != nil {
return xerrors.Errorf("cache block validation: %w", err)
}
return nil
}
func (cs *ChainStore) UnmarkBlockAsValidated(ctx context.Context, blkid cid.Cid) error {
key := blockValidationCacheKeyPrefix.Instance(blkid.String())
if err := cs.metadataDs.Delete(ctx, key); err != nil {
return xerrors.Errorf("removing from valid block cache: %w", err)
}
return nil
}
func (cs *ChainStore) SetGenesis(ctx context.Context, b *types.BlockHeader) error {
ts, err := types.NewTipSet([]*types.BlockHeader{b})
if err != nil {
return err
}
if err := cs.PutTipSet(ctx, ts); err != nil {
return err
}
return cs.metadataDs.Put(ctx, dstore.NewKey("0"), b.Cid().Bytes())
}
func (cs *ChainStore) PutTipSet(ctx context.Context, ts *types.TipSet) error {
if err := cs.PersistTipsets(ctx, []*types.TipSet{ts}); err != nil {
return xerrors.Errorf("failed to persist tipset: %w", err)
}
expanded, err := cs.expandTipset(ctx, ts.Blocks()[0])
if err != nil {
return xerrors.Errorf("errored while expanding tipset: %w", err)
}
if expanded.Key() != ts.Key() {
log.Debugf("expanded %s into %s\n", ts.Cids(), expanded.Cids())
tsBlk, err := expanded.Key().ToStorageBlock()
if err != nil {
return xerrors.Errorf("failed to get tipset key block: %w", err)
}
if err = cs.chainLocalBlockstore.Put(ctx, tsBlk); err != nil {
return xerrors.Errorf("failed to put tipset key block: %w", err)
}
}
if err := cs.MaybeTakeHeavierTipSet(ctx, expanded); err != nil {
return xerrors.Errorf("MaybeTakeHeavierTipSet failed in PutTipSet: %w", err)
}
return nil
}
// MaybeTakeHeavierTipSet evaluates the incoming tipset and locks it in our
// internal state as our new head, if and only if it is heavier than the current
// head and does not exceed the maximum fork length.
func (cs *ChainStore) MaybeTakeHeavierTipSet(ctx context.Context, ts *types.TipSet) error {
for {
cs.heaviestLk.Lock()
if len(cs.reorgCh) < reorgChBuf/2 {
break
}
cs.heaviestLk.Unlock()
log.Errorf("reorg channel is heavily backlogged, waiting a bit before trying to take process new tipsets")
select {
case <-time.After(time.Second / 2):
case <-ctx.Done():
return ctx.Err()
}
}
defer cs.heaviestLk.Unlock()
if ts.Equals(cs.heaviest) {
return nil
}
w, err := cs.weight(ctx, cs.StateBlockstore(), ts)
if err != nil {
return err
}
heaviestW, err := cs.weight(ctx, cs.StateBlockstore(), cs.heaviest)
if err != nil {
return err
}
heavier := w.GreaterThan(heaviestW)
if w.Equals(heaviestW) && !ts.Equals(cs.heaviest) {
log.Errorw("weight draw", "currTs", cs.heaviest, "ts", ts)
heavier = breakWeightTie(ts, cs.heaviest)
}
if heavier {
// TODO: don't do this for initial sync. Now that we don't have a
// difference between 'bootstrap sync' and 'caught up' sync, we need
// some other heuristic.
exceeds, err := cs.exceedsForkLength(ctx, cs.heaviest, ts)
if err != nil {
return err
}
if exceeds {
return nil
}
return cs.takeHeaviestTipSet(ctx, ts)
}
return nil
}
// Check if the two tipsets have a fork length above `ForkLengthThreshold`.
// `synced` is the head of the chain we are currently synced to and `external`
// is the incoming tipset potentially belonging to a forked chain. It assumes
// the external chain has already been validated and available in the ChainStore.
// The "fast forward" case is covered in this logic as a valid fork of length 0.
//
// FIXME: We may want to replace some of the logic in `syncFork()` with this.
//
// `syncFork()` counts the length on both sides of the fork at the moment (we
// need to settle on that) but here we just enforce it on the `synced` side.
func (cs *ChainStore) exceedsForkLength(ctx context.Context, synced, external *types.TipSet) (bool, error) {
if synced == nil || external == nil {
// FIXME: If `cs.heaviest` is nil we should just bypass the entire
// `MaybeTakeHeavierTipSet` logic (instead of each of the called
// functions having to handle the nil case on their own).
return false, nil
}
var err error
// `forkLength`: number of tipsets we need to walk back from the our `synced`
// chain to the common ancestor with the new `external` head in order to
// adopt the fork.
for forkLength := 0; forkLength < int(build.ForkLengthThreshold); forkLength++ {
// First walk back as many tipsets in the external chain to match the
// `synced` height to compare them. If we go past the `synced` height
// the subsequent match will fail but it will still be useful to get
// closer to the `synced` head parent's height in the next loop.
for external.Height() > synced.Height() {
if external.Height() == 0 {
// We reached the genesis of the external chain without a match;
// this is considered a fork outside the allowed limit (of "infinite"
// length).
return true, nil
}
external, err = cs.LoadTipSet(ctx, external.Parents())
if err != nil {
return false, xerrors.Errorf("failed to load parent tipset in external chain: %w", err)
}
}
// Now check if we arrived at the common ancestor.
if synced.Equals(external) {
return false, nil
}
// Now check to see if we've walked back to the checkpoint.
if synced.Equals(cs.checkpoint) {
return true, nil
}
// If we didn't, go back *one* tipset on the `synced` side (incrementing
// the `forkLength`).
if synced.Height() == 0 {
// Same check as the `external` side, if we reach the start (genesis)
// there is no common ancestor.
return true, nil
}
synced, err = cs.LoadTipSet(ctx, synced.Parents())
if err != nil {
return false, xerrors.Errorf("failed to load parent tipset in synced chain: %w", err)
}
}
// We traversed the fork length allowed without finding a common ancestor.
return true, nil
}
// ForceHeadSilent forces a chain head tipset without triggering a reorg
// operation.
//
// CAUTION: Use it only for testing, such as to teleport the chain to a
// particular tipset to carry out a benchmark, verification, etc. on a chain
// segment.
func (cs *ChainStore) ForceHeadSilent(ctx context.Context, ts *types.TipSet) error {
log.Warnf("(!!!) forcing a new head silently; new head: %s", ts)
cs.heaviestLk.Lock()
defer cs.heaviestLk.Unlock()
if err := cs.removeCheckpoint(ctx); err != nil {
return err
}
cs.heaviest = ts
err := cs.writeHead(ctx, ts)
if err != nil {
err = xerrors.Errorf("failed to write chain head: %s", err)
}
return err
}
type reorg struct {
old *types.TipSet
new *types.TipSet
}
const reorgChBuf = 32
func (cs *ChainStore) reorgWorker(ctx context.Context, initialNotifees []ReorgNotifee) chan<- reorg {
out := make(chan reorg, reorgChBuf)
notifees := make([]ReorgNotifee, len(initialNotifees))
copy(notifees, initialNotifees)
cs.wg.Add(1)
go func() {
defer cs.wg.Done()
defer log.Warn("reorgWorker quit")
for {
select {
case n := <-cs.reorgNotifeeCh:
notifees = append(notifees, n)
case r := <-out:
revert, apply, err := cs.ReorgOps(ctx, r.old, r.new)
if err != nil {
log.Error("computing reorg ops failed: ", err)
continue
}
cs.journal.RecordEvent(cs.evtTypes[evtTypeHeadChange], func() interface{} {
return HeadChangeEvt{
From: r.old.Key(),
FromHeight: r.old.Height(),
To: r.new.Key(),
ToHeight: r.new.Height(),
RevertCount: len(revert),
ApplyCount: len(apply),
}
})
// reverse the apply array
for i := len(apply)/2 - 1; i >= 0; i-- {
opp := len(apply) - 1 - i
apply[i], apply[opp] = apply[opp], apply[i]
}
var toremove map[int]struct{}
for i, hcf := range notifees {
err := hcf(revert, apply)
switch err {
case nil:
case ErrNotifeeDone:
if toremove == nil {
toremove = make(map[int]struct{})
}
toremove[i] = struct{}{}
default:
log.Error("head change func errored (BAD): ", err)
}
}
if len(toremove) > 0 {
newNotifees := make([]ReorgNotifee, 0, len(notifees)-len(toremove))
for i, hcf := range notifees {
_, remove := toremove[i]
if remove {
continue
}
newNotifees = append(newNotifees, hcf)
}
notifees = newNotifees
}
case <-ctx.Done():
return
}
}
}()
return out
}
// takeHeaviestTipSet actually sets the incoming tipset as our head both in
// memory and in the ChainStore. It also sends a notification to deliver to
// ReorgNotifees.
func (cs *ChainStore) takeHeaviestTipSet(ctx context.Context, ts *types.TipSet) error {
_, span := trace.StartSpan(ctx, "takeHeaviestTipSet")
defer span.End()
span.AddAttributes(trace.BoolAttribute("newHead", true))
log.Infof("New heaviest tipset! %s (height=%d)", ts.Cids(), ts.Height())
prevHeaviest := cs.heaviest
cs.heaviest = ts
if err := cs.writeHead(ctx, ts); err != nil {
log.Errorf("failed to write chain head: %s", err)
return err
}
if prevHeaviest != nil { // buf
if len(cs.reorgCh) > 0 {
log.Warnf("Reorg channel running behind, %d reorgs buffered", len(cs.reorgCh))
}
cs.reorgCh <- reorg{
old: prevHeaviest,
new: ts,
}
} else {
log.Warnf("no previous heaviest tipset found, using %s", ts.Cids())
}
return nil
}
// FlushValidationCache removes all results of block validation from the
// chain metadata store. Usually the first step after a new chain import.
func (cs *ChainStore) FlushValidationCache(ctx context.Context) error {
return FlushValidationCache(ctx, cs.metadataDs)
}
func FlushValidationCache(ctx context.Context, ds dstore.Batching) error {
log.Infof("clearing block validation cache...")
dsWalk, err := ds.Query(ctx, query.Query{
// Potential TODO: the validation cache is not a namespace on its own
// but is rather constructed as prefixed-key `foo:bar` via .Instance(), which
// in turn does not work with the filter, which can match only on `foo/bar`
//
// If this is addressed (blockcache goes into its own sub-namespace) then
// strings.HasPrefix(...) below can be skipped
//
// Prefix: blockValidationCacheKeyPrefix.String()
KeysOnly: true,
})
if err != nil {
return xerrors.Errorf("failed to initialize key listing query: %w", err)
}
allKeys, err := dsWalk.Rest()
if err != nil {
return xerrors.Errorf("failed to run key listing query: %w", err)
}
batch, err := ds.Batch(ctx)
if err != nil {
return xerrors.Errorf("failed to open a DS batch: %w", err)
}
delCnt := 0
for _, k := range allKeys {
if strings.HasPrefix(k.Key, blockValidationCacheKeyPrefix.String()) {
delCnt++
batch.Delete(ctx, dstore.RawKey(k.Key)) // nolint:errcheck
}
}
if err := batch.Commit(ctx); err != nil {
return xerrors.Errorf("failed to commit the DS batch: %w", err)
}
log.Infof("%d block validation entries cleared.", delCnt)
return nil
}
// SetHead sets the chainstores current 'best' head node.
// This should only be called if something is broken and needs fixing.
//
// This function will bypass and remove any checkpoints.
func (cs *ChainStore) SetHead(ctx context.Context, ts *types.TipSet) error {
cs.heaviestLk.Lock()
defer cs.heaviestLk.Unlock()
if err := cs.removeCheckpoint(ctx); err != nil {
return err
}
return cs.takeHeaviestTipSet(context.TODO(), ts)
}
// RemoveCheckpoint removes the current checkpoint.
func (cs *ChainStore) RemoveCheckpoint(ctx context.Context) error {
cs.heaviestLk.Lock()
defer cs.heaviestLk.Unlock()
return cs.removeCheckpoint(ctx)
}
func (cs *ChainStore) removeCheckpoint(ctx context.Context) error {
if err := cs.metadataDs.Delete(ctx, checkpointKey); err != nil {
return err
}
cs.checkpoint = nil
return nil
}
// SetCheckpoint will set a checkpoint past which the chainstore will not allow forks.
//
// NOTE: Checkpoints cannot be set beyond ForkLengthThreshold epochs in the past.
func (cs *ChainStore) SetCheckpoint(ctx context.Context, ts *types.TipSet) error {
tskBytes, err := json.Marshal(ts.Key())
if err != nil {
return err
}
cs.heaviestLk.Lock()
defer cs.heaviestLk.Unlock()
if ts.Height() > cs.heaviest.Height() {
return xerrors.Errorf("cannot set a checkpoint in the future")
}
// Otherwise, this operation could get _very_ expensive.
if cs.heaviest.Height()-ts.Height() > build.ForkLengthThreshold {
return xerrors.Errorf("cannot set a checkpoint before the fork threshold")
}
if !ts.Equals(cs.heaviest) {
anc, err := cs.IsAncestorOf(ctx, ts, cs.heaviest)
if err != nil {
return xerrors.Errorf("cannot determine whether checkpoint tipset is in main-chain: %w", err)
}
if !anc {
return xerrors.Errorf("cannot mark tipset as checkpoint, since it isn't in the main-chain: %w", err)
}
}
err = cs.metadataDs.Put(ctx, checkpointKey, tskBytes)
if err != nil {
return err
}
cs.checkpoint = ts
return nil
}
func (cs *ChainStore) GetCheckpoint() *types.TipSet {
cs.heaviestLk.RLock()
chkpt := cs.checkpoint
cs.heaviestLk.RUnlock()
return chkpt
}
// Contains returns whether our BlockStore has all blocks in the supplied TipSet.
func (cs *ChainStore) Contains(ctx context.Context, ts *types.TipSet) (bool, error) {
for _, c := range ts.Cids() {
has, err := cs.chainBlockstore.Has(ctx, c)
if err != nil {
return false, err
}
if !has {
return false, nil
}
}
return true, nil
}
// GetBlock fetches a BlockHeader with the supplied CID. It returns
// blockstore.ErrNotFound if the block was not found in the BlockStore.
func (cs *ChainStore) GetBlock(ctx context.Context, c cid.Cid) (*types.BlockHeader, error) {
var blk *types.BlockHeader
err := cs.chainLocalBlockstore.View(ctx, c, func(b []byte) (err error) {
blk, err = types.DecodeBlock(b)
return err
})
return blk, err
}
func (cs *ChainStore) LoadTipSet(ctx context.Context, tsk types.TipSetKey) (*types.TipSet, error) {
if ts, ok := cs.tsCache.Get(tsk); ok {
return ts, nil
}
// Fetch tipset block headers from blockstore in parallel
var eg errgroup.Group
cids := tsk.Cids()
blks := make([]*types.BlockHeader, len(cids))
for i, c := range cids {
i, c := i, c
eg.Go(func() error {
b, err := cs.GetBlock(ctx, c)
if err != nil {
return xerrors.Errorf("get block %s: %w", c, err)
}
blks[i] = b
return nil
})
}
err := eg.Wait()
if err != nil {
return nil, err
}
ts, err := types.NewTipSet(blks)
if err != nil {
return nil, err
}
cs.tsCache.Add(tsk, ts)
return ts, nil
}
// IsAncestorOf returns true if 'a' is an ancestor of 'b'
func (cs *ChainStore) IsAncestorOf(ctx context.Context, a, b *types.TipSet) (bool, error) {
if b.Height() <= a.Height() {
return false, nil
}
cur := b
for !a.Equals(cur) && cur.Height() > a.Height() {
next, err := cs.LoadTipSet(ctx, cur.Parents())
if err != nil {
return false, err
}
cur = next
}
return cur.Equals(a), nil
}
func (cs *ChainStore) NearestCommonAncestor(ctx context.Context, a, b *types.TipSet) (*types.TipSet, error) {
l, _, err := cs.ReorgOps(ctx, a, b)
if err != nil {
return nil, err
}
return cs.LoadTipSet(ctx, l[len(l)-1].Parents())
}
// ReorgOps takes two tipsets (which can be at different heights), and walks
// their corresponding chains backwards one step at a time until we find
// a common ancestor. It then returns the respective chain segments that fork
// from the identified ancestor, in reverse order, where the first element of
// each slice is the supplied tipset, and the last element is the common
// ancestor.
//
// If an error happens along the way, we return the error with nil slices.
func (cs *ChainStore) ReorgOps(ctx context.Context, a, b *types.TipSet) ([]*types.TipSet, []*types.TipSet, error) {
return ReorgOps(ctx, cs.LoadTipSet, a, b)
}
func ReorgOps(ctx context.Context, lts func(ctx context.Context, _ types.TipSetKey) (*types.TipSet, error), a, b *types.TipSet) ([]*types.TipSet, []*types.TipSet, error) {
left := a
right := b
var leftChain, rightChain []*types.TipSet
for !left.Equals(right) {
if left.Height() > right.Height() {
leftChain = append(leftChain, left)
par, err := lts(ctx, left.Parents())
if err != nil {
return nil, nil, err
}
left = par
} else {
rightChain = append(rightChain, right)
par, err := lts(ctx, right.Parents())
if err != nil {
log.Infof("failed to fetch right.Parents: %s", err)
return nil, nil, err
}
right = par
}
}
return leftChain, rightChain, nil
}
// GetHeaviestTipSet returns the current heaviest tipset known (i.e. our head).
func (cs *ChainStore) GetHeaviestTipSet() (ts *types.TipSet) {
cs.heaviestLk.RLock()
ts = cs.heaviest
cs.heaviestLk.RUnlock()
return
}
func (cs *ChainStore) AddToTipSetTracker(ctx context.Context, b *types.BlockHeader) error {
cs.tstLk.Lock()
defer cs.tstLk.Unlock()
tss := cs.tipsets[b.Height]
for _, oc := range tss {
if oc == b.Cid() {
log.Debug("tried to add block to tipset tracker that was already there")
return nil
}
h, err := cs.GetBlock(ctx, oc)
if err == nil && h != nil {
if h.Miner == b.Miner {
log.Warnf("Have multiple blocks from miner %s at height %d in our tipset cache %s-%s", b.Miner, b.Height, b.Cid(), h.Cid())
}
}
}
// This function is called 5 times per epoch on average
// It is also called with tipsets that are done with initial validation
// so they cannot be from the future.
// We are guaranteed not to use tipsets older than 900 epochs (fork limit)
// This means that we ideally want to keep only most recent 900 epochs in here
// Golang's map iteration starts at a random point in a map.
// With 5 tries per epoch, and 900 entries to keep, on average we will have
// ~136 garbage entires in the `cs.tipsets` map. (solve for 1-(1-x/(900+x))^5 == 0.5)
// Seems good enough to me
for height := range cs.tipsets {
if height < b.Height-build.Finality {
delete(cs.tipsets, height)
}
break
}
cs.tipsets[b.Height] = append(tss, b.Cid())
return nil
}
func (cs *ChainStore) PersistTipsets(ctx context.Context, tipsets []*types.TipSet) error {
toPersist := make([]*types.BlockHeader, 0, len(tipsets)*int(build.BlocksPerEpoch))
tsBlks := make([]block.Block, 0, len(tipsets))
for _, ts := range tipsets {
toPersist = append(toPersist, ts.Blocks()...)
tsBlk, err := ts.Key().ToStorageBlock()
if err != nil {
return xerrors.Errorf("failed to get tipset key block: %w", err)
}
tsBlks = append(tsBlks, tsBlk)
}
if err := cs.persistBlockHeaders(ctx, toPersist...); err != nil {
return xerrors.Errorf("failed to persist block headers: %w", err)
}
if err := cs.chainLocalBlockstore.PutMany(ctx, tsBlks); err != nil {
return xerrors.Errorf("failed to put tipset key blocks: %w", err)
}
return nil
}