-
Notifications
You must be signed in to change notification settings - Fork 669
/
staker_tx_verification.go
775 lines (678 loc) · 21.9 KB
/
staker_tx_verification.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
// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package executor
import (
"errors"
"fmt"
"time"
stdmath "math"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/utils/constants"
"github.com/ava-labs/avalanchego/utils/math"
"github.com/ava-labs/avalanchego/vms/components/avax"
"github.com/ava-labs/avalanchego/vms/platformvm/state"
"github.com/ava-labs/avalanchego/vms/platformvm/txs"
)
var (
errWeightTooSmall = errors.New("weight of this validator is too low")
errWeightTooLarge = errors.New("weight of this validator is too large")
errInsufficientDelegationFee = errors.New("staker charges an insufficient delegation fee")
errStakeTooShort = errors.New("staking period is too short")
errStakeTooLong = errors.New("staking period is too long")
errFlowCheckFailed = errors.New("flow check failed")
errFutureStakeTime = fmt.Errorf("staker is attempting to start staking more than %s ahead of the current chain time", MaxFutureStartTime)
errValidatorSubset = errors.New("all subnets' staking period must be a subset of the primary network")
errNotValidator = errors.New("isn't a current or pending validator")
errRemovePermissionlessValidator = errors.New("attempting to remove permissionless validator")
errStakeOverflow = errors.New("validator stake exceeds limit")
errOverDelegated = errors.New("validator would be over delegated")
errIsNotTransformSubnetTx = errors.New("is not a transform subnet tx")
errTimestampNotBeforeStartTime = errors.New("chain timestamp not before start time")
errDuplicateValidator = errors.New("duplicate validator")
errDelegateToPermissionedValidator = errors.New("delegation to permissioned validator")
errWrongStakedAssetID = errors.New("incorrect staked assetID")
)
// verifyAddValidatorTx carries out the validation for an AddValidatorTx.
// It returns the tx outputs that should be returned if this validator is not
// added to the staking set.
func verifyAddValidatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddValidatorTx,
) (
[]*avax.TransferableOutput,
error,
) {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return nil, err
}
duration := tx.Validator.Duration()
switch {
case tx.Validator.Wght < backend.Config.MinValidatorStake:
// Ensure validator is staking at least the minimum amount
return nil, errWeightTooSmall
case tx.Validator.Wght > backend.Config.MaxValidatorStake:
// Ensure validator isn't staking too much
return nil, errWeightTooLarge
case tx.DelegationShares < backend.Config.MinDelegationFee:
// Ensure the validator fee is at least the minimum amount
return nil, errInsufficientDelegationFee
case duration < backend.Config.MinStakeDuration:
// Ensure staking length is not too short
return nil, errStakeTooShort
case duration > backend.Config.MaxStakeDuration:
// Ensure staking length is not too long
return nil, errStakeTooLong
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
if !backend.Bootstrapped.Get() {
return outs, nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current time
startTime := tx.StartTime()
if !currentTimestamp.Before(startTime) {
return nil, fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
startTime,
)
}
_, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err == nil {
return nil, fmt.Errorf(
"attempted to issue duplicate validation for %s",
tx.Validator.NodeID,
)
}
if err != database.ErrNotFound {
return nil, fmt.Errorf(
"failed to find whether %s is a primary network validator: %w",
tx.Validator.NodeID,
err,
)
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.AddPrimaryNetworkValidatorFee,
},
); err != nil {
return nil, fmt.Errorf("%w: %v", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if startTime.After(maxStartTime) {
return nil, errFutureStakeTime
}
return outs, nil
}
// verifyAddSubnetValidatorTx carries out the validation for an
// AddSubnetValidatorTx.
func verifyAddSubnetValidatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddSubnetValidatorTx,
) error {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return err
}
duration := tx.Validator.Duration()
switch {
case duration < backend.Config.MinStakeDuration:
// Ensure staking length is not too short
return errStakeTooShort
case duration > backend.Config.MaxStakeDuration:
// Ensure staking length is not too long
return errStakeTooLong
}
if !backend.Bootstrapped.Get() {
return nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current timestamp
validatorStartTime := tx.StartTime()
if !currentTimestamp.Before(validatorStartTime) {
return fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
validatorStartTime,
)
}
_, err := GetValidator(chainState, tx.SubnetValidator.Subnet, tx.Validator.NodeID)
if err == nil {
return fmt.Errorf(
"attempted to issue duplicate subnet validation for %s",
tx.Validator.NodeID,
)
}
if err != database.ErrNotFound {
return fmt.Errorf(
"failed to find whether %s is a subnet validator: %w",
tx.Validator.NodeID,
err,
)
}
primaryNetworkValidator, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err != nil {
return fmt.Errorf(
"failed to fetch the primary network validator for %s: %w",
tx.Validator.NodeID,
err,
)
}
// Ensure that the period this validator validates the specified subnet
// is a subset of the time they validate the primary network.
if !tx.Validator.BoundedBy(primaryNetworkValidator.StartTime, primaryNetworkValidator.EndTime) {
return errValidatorSubset
}
baseTxCreds, err := verifyPoASubnetAuthorization(backend, chainState, sTx, tx.SubnetValidator.Subnet, tx.SubnetAuth)
if err != nil {
return err
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
tx.Outs,
baseTxCreds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.AddSubnetValidatorFee,
},
); err != nil {
return fmt.Errorf("%w: %v", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if validatorStartTime.After(maxStartTime) {
return errFutureStakeTime
}
return nil
}
// Returns the representation of [tx.NodeID] validating [tx.Subnet].
// Returns true if [tx.NodeID] is a current validator of [tx.Subnet].
// Returns an error if the given tx is invalid.
// The transaction is valid if:
// * [tx.NodeID] is a current/pending PoA validator of [tx.Subnet].
// * [sTx]'s creds authorize it to spend the stated inputs.
// * [sTx]'s creds authorize it to remove a validator from [tx.Subnet].
// * The flow checker passes.
func removeSubnetValidatorValidation(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.RemoveSubnetValidatorTx,
) (*state.Staker, bool, error) {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return nil, false, err
}
isCurrentValidator := true
vdr, err := chainState.GetCurrentValidator(tx.Subnet, tx.NodeID)
if err == database.ErrNotFound {
vdr, err = chainState.GetPendingValidator(tx.Subnet, tx.NodeID)
isCurrentValidator = false
}
if err != nil {
// It isn't a current or pending validator.
return nil, false, fmt.Errorf(
"%s %w of %s: %v",
tx.NodeID,
errNotValidator,
tx.Subnet,
err,
)
}
if vdr.Priority != txs.SubnetPermissionedValidatorCurrentPriority &&
vdr.Priority != txs.SubnetPermissionedValidatorPendingPriority {
return nil, false, errRemovePermissionlessValidator
}
if !backend.Bootstrapped.Get() {
// Not bootstrapped yet -- don't need to do full verification.
return vdr, isCurrentValidator, nil
}
baseTxCreds, err := verifySubnetAuthorization(backend, chainState, sTx, tx.Subnet, tx.SubnetAuth)
if err != nil {
return nil, false, err
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
tx.Outs,
baseTxCreds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.TxFee,
},
); err != nil {
return nil, false, fmt.Errorf("%w: %v", errFlowCheckFailed, err)
}
return vdr, isCurrentValidator, nil
}
// verifyAddDelegatorTx carries out the validation for an AddDelegatorTx.
// It returns the tx outputs that should be returned if this delegator is not
// added to the staking set.
func verifyAddDelegatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddDelegatorTx,
) (
[]*avax.TransferableOutput,
error,
) {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return nil, err
}
duration := tx.Validator.Duration()
switch {
case duration < backend.Config.MinStakeDuration:
// Ensure staking length is not too short
return nil, errStakeTooShort
case duration > backend.Config.MaxStakeDuration:
// Ensure staking length is not too long
return nil, errStakeTooLong
case tx.Validator.Wght < backend.Config.MinDelegatorStake:
// Ensure validator is staking at least the minimum amount
return nil, errWeightTooSmall
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
if !backend.Bootstrapped.Get() {
return outs, nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current timestamp
validatorStartTime := tx.StartTime()
if !currentTimestamp.Before(validatorStartTime) {
return nil, fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
validatorStartTime,
)
}
primaryNetworkValidator, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err != nil {
return nil, fmt.Errorf(
"failed to fetch the primary network validator for %s: %w",
tx.Validator.NodeID,
err,
)
}
maximumWeight, err := math.Mul64(MaxValidatorWeightFactor, primaryNetworkValidator.Weight)
if err != nil {
return nil, errStakeOverflow
}
if backend.Config.IsApricotPhase3Activated(currentTimestamp) {
maximumWeight = math.Min(maximumWeight, backend.Config.MaxValidatorStake)
}
txID := sTx.ID()
newStaker, err := state.NewPendingStaker(txID, tx)
if err != nil {
return nil, err
}
canDelegate, err := canDelegate(chainState, primaryNetworkValidator, maximumWeight, newStaker)
if err != nil {
return nil, err
}
if !canDelegate {
return nil, errOverDelegated
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: backend.Config.AddPrimaryNetworkDelegatorFee,
},
); err != nil {
return nil, fmt.Errorf("%w: %v", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if validatorStartTime.After(maxStartTime) {
return nil, errFutureStakeTime
}
return outs, nil
}
// verifyAddPermissionlessValidatorTx carries out the validation for an
// AddPermissionlessValidatorTx.
func verifyAddPermissionlessValidatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddPermissionlessValidatorTx,
) error {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return err
}
if !backend.Bootstrapped.Get() {
return nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current time
startTime := tx.StartTime()
if !currentTimestamp.Before(startTime) {
return fmt.Errorf(
"%w: %s >= %s",
errTimestampNotBeforeStartTime,
currentTimestamp,
startTime,
)
}
validatorRules, err := getValidatorRules(backend, chainState, tx.Subnet)
if err != nil {
return err
}
duration := tx.Validator.Duration()
stakedAssetID := tx.StakeOuts[0].AssetID()
switch {
case tx.Validator.Wght < validatorRules.minValidatorStake:
// Ensure validator is staking at least the minimum amount
return errWeightTooSmall
case tx.Validator.Wght > validatorRules.maxValidatorStake:
// Ensure validator isn't staking too much
return errWeightTooLarge
case tx.DelegationShares < validatorRules.minDelegationFee:
// Ensure the validator fee is at least the minimum amount
return errInsufficientDelegationFee
case duration < validatorRules.minStakeDuration:
// Ensure staking length is not too short
return errStakeTooShort
case duration > validatorRules.maxStakeDuration:
// Ensure staking length is not too long
return errStakeTooLong
case stakedAssetID != validatorRules.assetID:
// Wrong assetID used
return fmt.Errorf(
"%w: %s != %s",
errWrongStakedAssetID,
validatorRules.assetID,
stakedAssetID,
)
}
_, err = GetValidator(chainState, tx.Subnet, tx.Validator.NodeID)
if err == nil {
return fmt.Errorf(
"%w: %s on %s",
errDuplicateValidator,
tx.Validator.NodeID,
tx.Subnet,
)
}
if err != database.ErrNotFound {
return fmt.Errorf(
"failed to find whether %s is a validator on %s: %w",
tx.Validator.NodeID,
tx.Subnet,
err,
)
}
var txFee uint64
if tx.Subnet != constants.PrimaryNetworkID {
primaryNetworkValidator, err := GetValidator(chainState, constants.PrimaryNetworkID, tx.Validator.NodeID)
if err != nil {
return fmt.Errorf(
"failed to fetch the primary network validator for %s: %w",
tx.Validator.NodeID,
err,
)
}
// Ensure that the period this validator validates the specified subnet
// is a subset of the time they validate the primary network.
if !tx.Validator.BoundedBy(primaryNetworkValidator.StartTime, primaryNetworkValidator.EndTime) {
return errValidatorSubset
}
txFee = backend.Config.AddSubnetValidatorFee
} else {
txFee = backend.Config.AddPrimaryNetworkValidatorFee
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: txFee,
},
); err != nil {
return fmt.Errorf("%w: %v", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if startTime.After(maxStartTime) {
return errFutureStakeTime
}
return nil
}
type addValidatorRules struct {
assetID ids.ID
minValidatorStake uint64
maxValidatorStake uint64
minStakeDuration time.Duration
maxStakeDuration time.Duration
minDelegationFee uint32
}
func getValidatorRules(
backend *Backend,
chainState state.Chain,
subnetID ids.ID,
) (*addValidatorRules, error) {
if subnetID == constants.PrimaryNetworkID {
return &addValidatorRules{
assetID: backend.Ctx.AVAXAssetID,
minValidatorStake: backend.Config.MinValidatorStake,
maxValidatorStake: backend.Config.MaxValidatorStake,
minStakeDuration: backend.Config.MinStakeDuration,
maxStakeDuration: backend.Config.MaxStakeDuration,
minDelegationFee: backend.Config.MinDelegationFee,
}, nil
}
transformSubnetIntf, err := chainState.GetSubnetTransformation(subnetID)
if err != nil {
return nil, err
}
transformSubnet, ok := transformSubnetIntf.Unsigned.(*txs.TransformSubnetTx)
if !ok {
return nil, errIsNotTransformSubnetTx
}
return &addValidatorRules{
assetID: transformSubnet.AssetID,
minValidatorStake: transformSubnet.MinValidatorStake,
maxValidatorStake: transformSubnet.MaxValidatorStake,
minStakeDuration: time.Duration(transformSubnet.MinStakeDuration) * time.Second,
maxStakeDuration: time.Duration(transformSubnet.MaxStakeDuration) * time.Second,
minDelegationFee: transformSubnet.MinDelegationFee,
}, nil
}
// verifyAddPermissionlessDelegatorTx carries out the validation for an
// AddPermissionlessDelegatorTx.
func verifyAddPermissionlessDelegatorTx(
backend *Backend,
chainState state.Chain,
sTx *txs.Tx,
tx *txs.AddPermissionlessDelegatorTx,
) error {
// Verify the tx is well-formed
if err := sTx.SyntacticVerify(backend.Ctx); err != nil {
return err
}
if !backend.Bootstrapped.Get() {
return nil
}
currentTimestamp := chainState.GetTimestamp()
// Ensure the proposed validator starts after the current timestamp
startTime := tx.StartTime()
if !currentTimestamp.Before(startTime) {
return fmt.Errorf(
"chain timestamp (%s) not before validator's start time (%s)",
currentTimestamp,
startTime,
)
}
delegatorRules, err := getDelegatorRules(backend, chainState, tx.Subnet)
if err != nil {
return err
}
duration := tx.Validator.Duration()
stakedAssetID := tx.StakeOuts[0].AssetID()
switch {
case tx.Validator.Wght < delegatorRules.minDelegatorStake:
// Ensure delegator is staking at least the minimum amount
return errWeightTooSmall
case duration < delegatorRules.minStakeDuration:
// Ensure staking length is not too short
return errStakeTooShort
case duration > delegatorRules.maxStakeDuration:
// Ensure staking length is not too long
return errStakeTooLong
case stakedAssetID != delegatorRules.assetID:
// Wrong assetID used
return fmt.Errorf(
"%w: %s != %s",
errWrongStakedAssetID,
delegatorRules.assetID,
stakedAssetID,
)
}
validator, err := GetValidator(chainState, tx.Subnet, tx.Validator.NodeID)
if err != nil {
return fmt.Errorf(
"failed to fetch the validator for %s on %s: %w",
tx.Validator.NodeID,
tx.Subnet,
err,
)
}
maximumWeight, err := math.Mul64(
uint64(delegatorRules.maxValidatorWeightFactor),
validator.Weight,
)
if err != nil {
maximumWeight = stdmath.MaxUint64
}
maximumWeight = math.Min(maximumWeight, delegatorRules.maxValidatorStake)
txID := sTx.ID()
newStaker, err := state.NewPendingStaker(txID, tx)
if err != nil {
return err
}
canDelegate, err := canDelegate(chainState, validator, maximumWeight, newStaker)
if err != nil {
return err
}
if !canDelegate {
return errOverDelegated
}
outs := make([]*avax.TransferableOutput, len(tx.Outs)+len(tx.StakeOuts))
copy(outs, tx.Outs)
copy(outs[len(tx.Outs):], tx.StakeOuts)
var txFee uint64
if tx.Subnet != constants.PrimaryNetworkID {
// Invariant: Delegators must only be able to reference validator
// transactions that implement [txs.ValidatorTx]. All
// validator transactions implement this interface except the
// AddSubnetValidatorTx. AddSubnetValidatorTx is the only
// permissioned validator, so we verify this delegator is
// pointing to a permissionless validator.
if validator.Priority == txs.SubnetPermissionedValidatorCurrentPriority ||
validator.Priority == txs.SubnetPermissionedValidatorPendingPriority {
return errDelegateToPermissionedValidator
}
txFee = backend.Config.AddSubnetDelegatorFee
} else {
txFee = backend.Config.AddPrimaryNetworkDelegatorFee
}
// Verify the flowcheck
if err := backend.FlowChecker.VerifySpend(
tx,
chainState,
tx.Ins,
outs,
sTx.Creds,
map[ids.ID]uint64{
backend.Ctx.AVAXAssetID: txFee,
},
); err != nil {
return fmt.Errorf("%w: %v", errFlowCheckFailed, err)
}
// Make sure the tx doesn't start too far in the future. This is done last
// to allow the verifier visitor to explicitly check for this error.
maxStartTime := currentTimestamp.Add(MaxFutureStartTime)
if startTime.After(maxStartTime) {
return errFutureStakeTime
}
return nil
}
type addDelegatorRules struct {
assetID ids.ID
minDelegatorStake uint64
maxValidatorStake uint64
minStakeDuration time.Duration
maxStakeDuration time.Duration
maxValidatorWeightFactor byte
}
func getDelegatorRules(
backend *Backend,
chainState state.Chain,
subnetID ids.ID,
) (*addDelegatorRules, error) {
if subnetID == constants.PrimaryNetworkID {
return &addDelegatorRules{
assetID: backend.Ctx.AVAXAssetID,
minDelegatorStake: backend.Config.MinDelegatorStake,
maxValidatorStake: backend.Config.MaxValidatorStake,
minStakeDuration: backend.Config.MinStakeDuration,
maxStakeDuration: backend.Config.MaxStakeDuration,
maxValidatorWeightFactor: MaxValidatorWeightFactor,
}, nil
}
transformSubnetIntf, err := chainState.GetSubnetTransformation(subnetID)
if err != nil {
return nil, err
}
transformSubnet, ok := transformSubnetIntf.Unsigned.(*txs.TransformSubnetTx)
if !ok {
return nil, errIsNotTransformSubnetTx
}
return &addDelegatorRules{
assetID: transformSubnet.AssetID,
minDelegatorStake: transformSubnet.MinDelegatorStake,
maxValidatorStake: transformSubnet.MaxValidatorStake,
minStakeDuration: time.Duration(transformSubnet.MinStakeDuration) * time.Second,
maxStakeDuration: time.Duration(transformSubnet.MaxStakeDuration) * time.Second,
maxValidatorWeightFactor: transformSubnet.MaxValidatorWeightFactor,
}, nil
}