-
Notifications
You must be signed in to change notification settings - Fork 176
/
state.go
651 lines (566 loc) · 20.7 KB
/
state.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
// (c) 2019 Dapper Labs - ALL RIGHTS RESERVED
package badger
import (
"errors"
"fmt"
"github.com/dgraph-io/badger/v2"
"github.com/onflow/flow-go/model/flow"
"github.com/onflow/flow-go/module"
"github.com/onflow/flow-go/state/protocol"
"github.com/onflow/flow-go/state/protocol/invalid"
"github.com/onflow/flow-go/storage"
"github.com/onflow/flow-go/storage/badger/operation"
"github.com/onflow/flow-go/storage/badger/transaction"
)
type State struct {
metrics module.ComplianceMetrics
db *badger.DB
headers storage.Headers
blocks storage.Blocks
results storage.ExecutionResults
seals storage.Seals
epoch struct {
setups storage.EpochSetups
commits storage.EpochCommits
statuses storage.EpochStatuses
}
}
type BootstrapConfig struct {
// SkipNetworkAddressValidation flags allows skipping all the network address related validations not needed for
// an unstaked node
SkipNetworkAddressValidation bool
}
func defaultBootstrapConfig() *BootstrapConfig {
return &BootstrapConfig{
SkipNetworkAddressValidation: false,
}
}
type BootstrapConfigOptions func(conf *BootstrapConfig)
func SkipNetworkAddressValidation(conf *BootstrapConfig) {
conf.SkipNetworkAddressValidation = true
}
func Bootstrap(
metrics module.ComplianceMetrics,
db *badger.DB,
headers storage.Headers,
seals storage.Seals,
results storage.ExecutionResults,
blocks storage.Blocks,
setups storage.EpochSetups,
commits storage.EpochCommits,
statuses storage.EpochStatuses,
root protocol.Snapshot,
options ...BootstrapConfigOptions,
) (*State, error) {
config := defaultBootstrapConfig()
for _, opt := range options {
opt(config)
}
isBootstrapped, err := IsBootstrapped(db)
if err != nil {
return nil, fmt.Errorf("failed to determine whether database contains bootstrapped state: %w", err)
}
if isBootstrapped {
return nil, fmt.Errorf("expected empty database")
}
state := newState(metrics, db, headers, seals, results, blocks, setups, commits, statuses)
if err := IsValidRootSnapshot(root, !config.SkipNetworkAddressValidation); err != nil {
return nil, fmt.Errorf("cannot bootstrap invalid root snapshot: %w", err)
}
segment, err := root.SealingSegment()
if err != nil {
return nil, fmt.Errorf("could not get sealing segment: %w", err)
}
err = operation.RetryOnConflictTx(db, transaction.Update, func(tx *transaction.Tx) error {
// sealing segment is in ascending height order, so the tail is the
// oldest ancestor and head is the newest child in the segment
// TAIL <- ... <- HEAD
highest := segment.Highest() // reference block of the snapshot
lowest := segment.Lowest() // last sealed block
// 1) bootstrap the sealing segment
err = state.bootstrapSealingSegment(segment, highest)(tx)
if err != nil {
return fmt.Errorf("could not bootstrap sealing chain segment blocks: %w", err)
}
// 2) insert the root quorum certificate into the database
qc, err := root.QuorumCertificate()
if err != nil {
return fmt.Errorf("could not get root qc: %w", err)
}
err = transaction.WithTx(operation.InsertRootQuorumCertificate(qc))(tx)
if err != nil {
return fmt.Errorf("could not insert root qc: %w", err)
}
// 3) initialize the current protocol state height/view pointers
err = transaction.WithTx(state.bootstrapStatePointers(root))(tx)
if err != nil {
return fmt.Errorf("could not bootstrap height/view pointers: %w", err)
}
// 4) initialize values related to the epoch logic
err = state.bootstrapEpoch(root, !config.SkipNetworkAddressValidation)(tx)
if err != nil {
return fmt.Errorf("could not bootstrap epoch values: %w", err)
}
// 5) initialize spork params
err = transaction.WithTx(state.bootstrapSporkInfo(root))(tx)
if err != nil {
return fmt.Errorf("could not bootstrap spork info: %w", err)
}
// 6) set metric values
err = state.updateEpochMetrics(root)
if err != nil {
return fmt.Errorf("could not update epoch metrics: %w", err)
}
state.metrics.BlockSealed(lowest)
state.metrics.SealedHeight(lowest.Header.Height)
state.metrics.FinalizedHeight(highest.Header.Height)
for _, block := range segment.Blocks {
state.metrics.BlockFinalized(block)
}
return nil
})
if err != nil {
return nil, fmt.Errorf("bootstrapping failed: %w", err)
}
return state, nil
}
// bootstrapSealingSegment inserts all blocks and associated metadata for the
// protocol state root snapshot to disk.
func (state *State) bootstrapSealingSegment(segment *flow.SealingSegment, head *flow.Block) func(tx *transaction.Tx) error {
return func(tx *transaction.Tx) error {
for _, result := range segment.ExecutionResults {
err := transaction.WithTx(operation.SkipDuplicates(operation.InsertExecutionResult(result)))(tx)
if err != nil {
return fmt.Errorf("could not insert execution result: %w", err)
}
err = transaction.WithTx(operation.IndexExecutionResult(result.BlockID, result.ID()))(tx)
if err != nil {
return fmt.Errorf("could not index execution result: %w", err)
}
}
// insert the first seal (in case the segment's first block contains no seal)
if segment.FirstSeal != nil {
err := transaction.WithTx(operation.InsertSeal(segment.FirstSeal.ID(), segment.FirstSeal))(tx)
if err != nil {
return fmt.Errorf("could not insert first seal: %w", err)
}
}
for i, block := range segment.Blocks {
blockID := block.ID()
height := block.Header.Height
err := state.blocks.StoreTx(block)(tx)
if err != nil {
return fmt.Errorf("could not insert root block: %w", err)
}
err = transaction.WithTx(operation.InsertBlockValidity(blockID, true))(tx)
if err != nil {
return fmt.Errorf("could not mark root block as valid: %w", err)
}
err = transaction.WithTx(operation.IndexBlockHeight(height, blockID))(tx)
if err != nil {
return fmt.Errorf("could not index root block segment (id=%x): %w", blockID, err)
}
// index the latest seal as of this block
latestSealID, ok := segment.LatestSeals[blockID]
if !ok {
return fmt.Errorf("missing latest seal for sealing segment block (id=%s)", blockID)
}
// sanity check: make sure the seal exists
var latestSeal flow.Seal
err = transaction.WithTx(operation.RetrieveSeal(latestSealID, &latestSeal))(tx)
if err != nil {
return fmt.Errorf("could not verify latest seal for block (id=%x) exists: %w", blockID, err)
}
err = transaction.WithTx(operation.IndexLatestSealAtBlock(blockID, latestSealID))(tx)
if err != nil {
return fmt.Errorf("could not index block seal: %w", err)
}
// for all but the first block in the segment, index the parent->child relationship
if i > 0 {
err = transaction.WithTx(operation.InsertBlockChildren(block.Header.ParentID, []flow.Identifier{blockID}))(tx)
if err != nil {
return fmt.Errorf("could not insert child index for block (id=%x): %w", blockID, err)
}
}
}
// insert an empty child index for the final block in the segment
err := transaction.WithTx(operation.InsertBlockChildren(head.ID(), nil))(tx)
if err != nil {
return fmt.Errorf("could not insert child index for head block (id=%x): %w", head.ID(), err)
}
return nil
}
}
// bootstrapStatePointers instantiates special pointers used to by the protocol
// state to keep track of special block heights and views.
func (state *State) bootstrapStatePointers(root protocol.Snapshot) func(*badger.Txn) error {
return func(tx *badger.Txn) error {
segment, err := root.SealingSegment()
if err != nil {
return fmt.Errorf("could not get sealing segment: %w", err)
}
highest := segment.Highest()
lowest := segment.Lowest()
// find the finalized seal that seals the lowest block, meaning seal.BlockID == lowest.ID()
seal, err := segment.FinalizedSeal()
if err != nil {
return fmt.Errorf("could not get finalized seal from sealing segment: %w", err)
}
// insert initial views for HotStuff
err = operation.InsertStartedView(highest.Header.ChainID, highest.Header.View)(tx)
if err != nil {
return fmt.Errorf("could not insert started view: %w", err)
}
err = operation.InsertVotedView(highest.Header.ChainID, highest.Header.View)(tx)
if err != nil {
return fmt.Errorf("could not insert started view: %w", err)
}
// insert height pointers
err = operation.InsertRootHeight(highest.Header.Height)(tx)
if err != nil {
return fmt.Errorf("could not insert root height: %w", err)
}
err = operation.InsertFinalizedHeight(highest.Header.Height)(tx)
if err != nil {
return fmt.Errorf("could not insert finalized height: %w", err)
}
err = operation.InsertSealedHeight(lowest.Header.Height)(tx)
if err != nil {
return fmt.Errorf("could not insert sealed height: %w", err)
}
err = operation.IndexFinalizedSealByBlockID(seal.BlockID, seal.ID())(tx)
if err != nil {
return fmt.Errorf("could not index sealed block: %w", err)
}
return nil
}
}
// bootstrapEpoch bootstraps the protocol state database with information about
// the previous, current, and next epochs as of the root snapshot.
//
// The root snapshot's sealing segment must not straddle any epoch transitions
// or epoch phase transitions.
func (state *State) bootstrapEpoch(root protocol.Snapshot, verifyNetworkAddress bool) func(*transaction.Tx) error {
return func(tx *transaction.Tx) error {
previous := root.Epochs().Previous()
current := root.Epochs().Current()
next := root.Epochs().Next()
// build the status as we go
status := new(flow.EpochStatus)
var setups []*flow.EpochSetup
var commits []*flow.EpochCommit
// insert previous epoch if it exists
_, err := previous.Counter()
if err == nil {
// if there is a previous epoch, both setup and commit events must exist
setup, err := protocol.ToEpochSetup(previous)
if err != nil {
return fmt.Errorf("could not get previous epoch setup event: %w", err)
}
commit, err := protocol.ToEpochCommit(previous)
if err != nil {
return fmt.Errorf("could not get previous epoch commit event: %w", err)
}
if err := verifyEpochSetup(setup, verifyNetworkAddress); err != nil {
return fmt.Errorf("invalid setup: %w", err)
}
if err := isValidEpochCommit(commit, setup); err != nil {
return fmt.Errorf("invalid commit")
}
setups = append(setups, setup)
commits = append(commits, commit)
status.PreviousEpoch.SetupID = setup.ID()
status.PreviousEpoch.CommitID = commit.ID()
} else if !errors.Is(err, protocol.ErrNoPreviousEpoch) {
return fmt.Errorf("could not retrieve previous epoch: %w", err)
}
// insert current epoch - both setup and commit events must exist
setup, err := protocol.ToEpochSetup(current)
if err != nil {
return fmt.Errorf("could not get current epoch setup event: %w", err)
}
commit, err := protocol.ToEpochCommit(current)
if err != nil {
return fmt.Errorf("could not get current epoch commit event: %w", err)
}
if err := verifyEpochSetup(setup, verifyNetworkAddress); err != nil {
return fmt.Errorf("invalid setup: %w", err)
}
if err := isValidEpochCommit(commit, setup); err != nil {
return fmt.Errorf("invalid commit")
}
setups = append(setups, setup)
commits = append(commits, commit)
status.CurrentEpoch.SetupID = setup.ID()
status.CurrentEpoch.CommitID = commit.ID()
// insert next epoch, if it exists
_, err = next.Counter()
if err == nil {
// either only the setup event, or both the setup and commit events must exist
setup, err := protocol.ToEpochSetup(next)
if err != nil {
return fmt.Errorf("could not get next epoch setup event: %w", err)
}
if err := verifyEpochSetup(setup, verifyNetworkAddress); err != nil {
return fmt.Errorf("invalid setup: %w", err)
}
setups = append(setups, setup)
status.NextEpoch.SetupID = setup.ID()
commit, err := protocol.ToEpochCommit(next)
if err != nil && !errors.Is(err, protocol.ErrEpochNotCommitted) {
return fmt.Errorf("could not get next epoch commit event: %w", err)
}
if err == nil {
if err := isValidEpochCommit(commit, setup); err != nil {
return fmt.Errorf("invalid commit")
}
commits = append(commits, commit)
status.NextEpoch.CommitID = commit.ID()
}
} else if !errors.Is(err, protocol.ErrNextEpochNotSetup) {
return fmt.Errorf("could not get next epoch: %w", err)
}
// sanity check: ensure epoch status is valid
err = status.Check()
if err != nil {
return fmt.Errorf("bootstrapping resulting in invalid epoch status: %w", err)
}
// insert all epoch setup/commit service events
for _, setup := range setups {
err = state.epoch.setups.StoreTx(setup)(tx)
if err != nil {
return fmt.Errorf("could not store epoch setup event: %w", err)
}
}
for _, commit := range commits {
err = state.epoch.commits.StoreTx(commit)(tx)
if err != nil {
return fmt.Errorf("could not store epoch commit event: %w", err)
}
}
// NOTE: as specified in the godoc, this code assumes that each block
// in the sealing segment in within the same phase within the same epoch.
segment, err := root.SealingSegment()
if err != nil {
return fmt.Errorf("could not get sealing segment: %w", err)
}
for _, block := range segment.Blocks {
blockID := block.ID()
err = state.epoch.statuses.StoreTx(blockID, status)(tx)
if err != nil {
return fmt.Errorf("could not store epoch status for block (id=%x): %w", blockID, err)
}
}
return nil
}
}
// bootstrapSporkInfo bootstraps the protocol state with information about the
// spork which is used to disambiguate Flow networks.
func (state *State) bootstrapSporkInfo(root protocol.Snapshot) func(*badger.Txn) error {
return func(tx *badger.Txn) error {
params := root.Params()
sporkID, err := params.SporkID()
if err != nil {
return fmt.Errorf("could not get spork ID: %w", err)
}
err = operation.InsertSporkID(sporkID)(tx)
if err != nil {
return fmt.Errorf("could not insert spork ID: %w", err)
}
version, err := params.ProtocolVersion()
if err != nil {
return fmt.Errorf("could not get protocol version: %w", err)
}
err = operation.InsertProtocolVersion(version)(tx)
if err != nil {
return fmt.Errorf("could not insert protocol version: %w", err)
}
return nil
}
}
func OpenState(
metrics module.ComplianceMetrics,
db *badger.DB,
headers storage.Headers,
seals storage.Seals,
results storage.ExecutionResults,
blocks storage.Blocks,
setups storage.EpochSetups,
commits storage.EpochCommits,
statuses storage.EpochStatuses,
) (*State, error) {
isBootstrapped, err := IsBootstrapped(db)
if err != nil {
return nil, fmt.Errorf("failed to determine whether database contains bootstrapped state: %w", err)
}
if !isBootstrapped {
return nil, fmt.Errorf("expected database to contain bootstrapped state")
}
state := newState(metrics, db, headers, seals, results, blocks, setups, commits, statuses)
finalSnapshot := state.Final()
// update all epoch related metrics
err = state.updateEpochMetrics(finalSnapshot)
if err != nil {
return nil, fmt.Errorf("failed to update epoch metrics: %w", err)
}
return state, nil
}
func (state *State) Params() protocol.Params {
return &Params{state: state}
}
func (state *State) Sealed() protocol.Snapshot {
// retrieve the latest sealed height
var sealed uint64
err := state.db.View(operation.RetrieveSealedHeight(&sealed))
if err != nil {
return invalid.NewSnapshot(fmt.Errorf("could not retrieve sealed height: %w", err))
}
return state.AtHeight(sealed)
}
func (state *State) Final() protocol.Snapshot {
// retrieve the latest finalized height
var finalized uint64
err := state.db.View(operation.RetrieveFinalizedHeight(&finalized))
if err != nil {
return invalid.NewSnapshot(fmt.Errorf("could not retrieve finalized height: %w", err))
}
return state.AtHeight(finalized)
}
func (state *State) AtHeight(height uint64) protocol.Snapshot {
// retrieve the block ID for the finalized height
var blockID flow.Identifier
err := state.db.View(operation.LookupBlockHeight(height, &blockID))
if err != nil {
return invalid.NewSnapshot(fmt.Errorf("could not look up block by height: %w", err))
}
return NewSnapshot(state, blockID)
}
func (state *State) AtBlockID(blockID flow.Identifier) protocol.Snapshot {
return NewSnapshot(state, blockID)
}
// newState initializes a new state backed by the provided a badger database,
// mempools and service components.
// The parameter `expectedBootstrappedState` indicates whether or not the database
// is expected to contain a an already bootstrapped state or not
func newState(
metrics module.ComplianceMetrics,
db *badger.DB,
headers storage.Headers,
seals storage.Seals,
results storage.ExecutionResults,
blocks storage.Blocks,
setups storage.EpochSetups,
commits storage.EpochCommits,
statuses storage.EpochStatuses,
) *State {
return &State{
metrics: metrics,
db: db,
headers: headers,
results: results,
seals: seals,
blocks: blocks,
epoch: struct {
setups storage.EpochSetups
commits storage.EpochCommits
statuses storage.EpochStatuses
}{
setups: setups,
commits: commits,
statuses: statuses,
},
}
}
// IsBootstrapped returns whether or not the database contains a bootstrapped state
func IsBootstrapped(db *badger.DB) (bool, error) {
var finalized uint64
err := db.View(operation.RetrieveFinalizedHeight(&finalized))
if errors.Is(err, storage.ErrNotFound) {
return false, nil
}
if err != nil {
return false, fmt.Errorf("retrieving finalized height failed: %w", err)
}
return true, nil
}
// updateEpochMetrics update the `consensus_compliance_current_epoch_counter` and the
// `consensus_compliance_current_epoch_phase` metric
func (state *State) updateEpochMetrics(snap protocol.Snapshot) error {
// update epoch counter
counter, err := snap.Epochs().Current().Counter()
if err != nil {
return fmt.Errorf("could not get current epoch counter: %w", err)
}
state.metrics.CurrentEpochCounter(counter)
// update epoch phase
phase, err := snap.Phase()
if err != nil {
return fmt.Errorf("could not get current epoch counter: %w", err)
}
state.metrics.CurrentEpochPhase(phase)
// update committed epoch final view
err = state.updateCommittedEpochFinalView(snap)
if err != nil {
return fmt.Errorf("could not update committed epoch final view")
}
currentEpochFinalView, err := snap.Epochs().Current().FinalView()
if err != nil {
return fmt.Errorf("could not update current epoch final view: %w", err)
}
state.metrics.CurrentEpochFinalView(currentEpochFinalView)
dkgPhase1FinalView, dkgPhase2FinalView, dkgPhase3FinalView, err := protocol.DKGPhaseViews(snap.Epochs().Current())
if err != nil {
return fmt.Errorf("could not get dkg phase final view: %w", err)
}
state.metrics.CurrentDKGPhase1FinalView(dkgPhase1FinalView)
state.metrics.CurrentDKGPhase2FinalView(dkgPhase2FinalView)
state.metrics.CurrentDKGPhase3FinalView(dkgPhase3FinalView)
// EECC - check whether the epoch emergency fallback flag has been set
// in the database. If so, skip updating any epoch-related metrics.
epochFallbackTriggered, err := state.isEpochEmergencyFallbackTriggered()
if err != nil {
return fmt.Errorf("could not check epoch emergency fallback flag: %w", err)
}
if epochFallbackTriggered {
state.metrics.EpochEmergencyFallbackTriggered()
}
return nil
}
// updateCommittedEpochFinalView updates the `committed_epoch_final_view` metric
// based on the current epoch phase of the input snapshot. It should be called
// at startup and during transitions between EpochSetup and EpochCommitted phases.
//
// For example, suppose we have epochs N and N+1.
// If we are in epoch N's Staking or Setup Phase, then epoch N's final view should be the value of the metric.
// If we are in epoch N's Committed Phase, then epoch N+1's final view should be the value of the metric.
func (state *State) updateCommittedEpochFinalView(snap protocol.Snapshot) error {
phase, err := snap.Phase()
if err != nil {
return fmt.Errorf("could not get epoch phase: %w", err)
}
// update metric based of epoch phase
switch phase {
case flow.EpochPhaseStaking, flow.EpochPhaseSetup:
// if we are in Staking or Setup phase, then set the metric value to the current epoch's final view
finalView, err := snap.Epochs().Current().FinalView()
if err != nil {
return fmt.Errorf("could not get current epoch final view from snapshot: %w", err)
}
state.metrics.CommittedEpochFinalView(finalView)
case flow.EpochPhaseCommitted:
// if we are in Committed phase, then set the metric value to the next epoch's final view
finalView, err := snap.Epochs().Next().FinalView()
if err != nil {
return fmt.Errorf("could not get next epoch final view from snapshot: %w", err)
}
state.metrics.CommittedEpochFinalView(finalView)
default:
return fmt.Errorf("invalid phase: %s", phase)
}
return nil
}
func (m *State) isEpochEmergencyFallbackTriggered() (bool, error) {
var triggered bool
err := m.db.View(operation.CheckEpochEmergencyFallbackTriggered(&triggered))
return triggered, err
}