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
package sequencing
import (
"context"
"encoding/binary"
"math/rand" // nosemgrep
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum-optimism/optimism/op-node/metrics"
"github.com/ethereum-optimism/optimism/op-node/rollup"
"github.com/ethereum-optimism/optimism/op-node/rollup/conductor"
"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
"github.com/ethereum-optimism/optimism/op-node/rollup/engine"
"github.com/ethereum-optimism/optimism/op-node/rollup/event"
"github.com/ethereum-optimism/optimism/op-service/clock"
"github.com/ethereum-optimism/optimism/op-service/eth"
"github.com/ethereum-optimism/optimism/op-service/predeploys"
"github.com/ethereum-optimism/optimism/op-service/testlog"
"github.com/ethereum-optimism/optimism/op-service/testutils"
)
type FakeAttributesBuilder struct {
cfg *rollup.Config
rng *rand.Rand
}
// used to put the L1 origin into the data-tx, without all the deposit-tx complexity, for testing purposes.
func encodeID(id eth.BlockID) []byte {
var out [32 + 8]byte
copy(out[:32], id.Hash[:])
binary.BigEndian.PutUint64(out[32:], id.Number)
return out[:]
}
func decodeID(data []byte) eth.BlockID {
return eth.BlockID{
Hash: common.Hash(data[:32]),
Number: binary.BigEndian.Uint64(data[32:]),
}
}
func (m *FakeAttributesBuilder) PreparePayloadAttributes(ctx context.Context,
l2Parent eth.L2BlockRef, epoch eth.BlockID) (attrs *eth.PayloadAttributes, err error) {
gasLimit := eth.Uint64Quantity(30_000_000)
attrs = ð.PayloadAttributes{
Timestamp: eth.Uint64Quantity(l2Parent.Time + m.cfg.BlockTime),
PrevRandao: eth.Bytes32(testutils.RandomHash(m.rng)),
SuggestedFeeRecipient: predeploys.SequencerFeeVaultAddr,
Withdrawals: nil,
ParentBeaconBlockRoot: nil,
Transactions: []eth.Data{encodeID(epoch)}, // simplified replacement for L1-info tx.
NoTxPool: false,
GasLimit: &gasLimit,
}
if m.cfg.IsEcotone(uint64(attrs.Timestamp)) {
r := testutils.RandomHash(m.rng)
attrs.ParentBeaconBlockRoot = &r
}
return attrs, nil
}
var _ derive.AttributesBuilder = (*FakeAttributesBuilder)(nil)
type FakeL1OriginSelector struct {
request eth.L2BlockRef
l1OriginFn func(l2Head eth.L2BlockRef) (eth.L1BlockRef, error)
}
func (f *FakeL1OriginSelector) FindL1Origin(ctx context.Context, l2Head eth.L2BlockRef) (eth.L1BlockRef, error) {
f.request = l2Head
return f.l1OriginFn(l2Head)
}
var _ L1OriginSelectorIface = (*FakeL1OriginSelector)(nil)
type BasicSequencerStateListener struct {
active bool
}
func (b *BasicSequencerStateListener) SequencerStarted() error {
b.active = true
return nil
}
func (b *BasicSequencerStateListener) SequencerStopped() error {
b.active = false
return nil
}
var _ SequencerStateListener = (*BasicSequencerStateListener)(nil)
// FakeConductor is a no-op conductor that assumes this node is the leader sequencer.
type FakeConductor struct {
closed bool
leader bool
committed *eth.ExecutionPayloadEnvelope
}
var _ conductor.SequencerConductor = &FakeConductor{}
func (c *FakeConductor) Enabled(ctx context.Context) bool {
return true
}
func (c *FakeConductor) Leader(ctx context.Context) (bool, error) {
return c.leader, nil
}
func (c *FakeConductor) CommitUnsafePayload(ctx context.Context, payload *eth.ExecutionPayloadEnvelope) error {
c.committed = payload
return nil
}
func (c *FakeConductor) OverrideLeader(ctx context.Context) error {
c.leader = true
return nil
}
func (c *FakeConductor) Close() {
c.closed = true
}
type FakeAsyncGossip struct {
payload *eth.ExecutionPayloadEnvelope
started bool
stopped bool
}
func (f *FakeAsyncGossip) Gossip(payload *eth.ExecutionPayloadEnvelope) {
f.payload = payload
}
func (f *FakeAsyncGossip) Get() *eth.ExecutionPayloadEnvelope {
return f.payload
}
func (f *FakeAsyncGossip) Clear() {
f.payload = nil
}
func (f *FakeAsyncGossip) Stop() {
f.stopped = true
}
func (f *FakeAsyncGossip) Start() {
f.started = true
}
var _ AsyncGossiper = (*FakeAsyncGossip)(nil)
// TestSequencer_StartStop runs through start/stop state back and forth to test state changes.
func TestSequencer_StartStop(t *testing.T) {
logger := testlog.Logger(t, log.LevelError)
seq, deps := createSequencer(logger)
emitter := &testutils.MockEmitter{}
seq.AttachEmitter(emitter)
// Allow the sequencer to be the leader.
// This is checked, since we start sequencing later, after initialization.
// Also see issue #11121 for context: the conductor is checked by the infra, when initialized in active state.
deps.conductor.leader = true
emitter.ExpectOnce(engine.ForkchoiceRequestEvent{})
require.NoError(t, seq.Init(context.Background(), false))
emitter.AssertExpectations(t)
require.False(t, deps.conductor.closed, "conductor is ready")
require.True(t, deps.asyncGossip.started, "async gossip is always started on initialization")
require.False(t, deps.seqState.active, "sequencer not active yet")
// latest refs should all be empty
require.Equal(t, common.Hash{}, seq.latest.Ref.Hash)
require.Equal(t, common.Hash{}, seq.latestSealed.Hash)
require.Equal(t, common.Hash{}, seq.latestHead.Hash)
// update the latestSealed
envelope := ð.ExecutionPayloadEnvelope{
ExecutionPayload: ð.ExecutionPayload{},
}
emitter.ExpectOnce(engine.PayloadProcessEvent{
Envelope: envelope,
Ref: eth.L2BlockRef{Hash: common.Hash{0xaa}},
})
seq.OnEvent(engine.BuildSealedEvent{
Envelope: envelope,
Ref: eth.L2BlockRef{Hash: common.Hash{0xaa}},
})
require.Equal(t, common.Hash{0xaa}, seq.latest.Ref.Hash)
require.Equal(t, common.Hash{0xaa}, seq.latestSealed.Hash)
require.Equal(t, common.Hash{}, seq.latestHead.Hash)
// update latestHead
emitter.AssertExpectations(t)
seq.OnEvent(engine.ForkchoiceUpdateEvent{
UnsafeL2Head: eth.L2BlockRef{Hash: common.Hash{0xaa}},
SafeL2Head: eth.L2BlockRef{},
FinalizedL2Head: eth.L2BlockRef{},
})
require.Equal(t, common.Hash{0xaa}, seq.latest.Ref.Hash)
require.Equal(t, common.Hash{0xaa}, seq.latestSealed.Hash)
require.Equal(t, common.Hash{0xaa}, seq.latestHead.Hash)
require.False(t, seq.Active())
// no action scheduled
_, ok := seq.NextAction()
require.False(t, ok)
require.NoError(t, seq.Start(context.Background(), common.Hash{0xaa}))
require.True(t, seq.Active())
require.True(t, deps.seqState.active, "sequencer signaled it is active")
// sequencer is active now, it should schedule work
_, ok = seq.NextAction()
require.True(t, ok)
// can't activate again before stopping
err := seq.Start(context.Background(), common.Hash{0xaa})
require.ErrorIs(t, err, ErrSequencerAlreadyStarted)
head, err := seq.Stop(context.Background())
require.NoError(t, err)
require.Equal(t, head, common.Hash{0xaa})
require.False(t, deps.seqState.active, "sequencer signaled it is no longer active")
_, err = seq.Stop(context.Background())
require.ErrorIs(t, err, ErrSequencerAlreadyStopped)
// need to resume from the last head
err = seq.Start(context.Background(), common.Hash{0xbb})
require.ErrorContains(t, err, "block hash does not match")
// can start again from head that it left
err = seq.Start(context.Background(), head)
require.NoError(t, err)
}
// TestSequencer_StaleBuild stops the sequencer after block-building,
// but before processing the block locally,
// and then continues it again, to check if the async-gossip gets cleared,
// instead of trying to re-insert the block.
func TestSequencer_StaleBuild(t *testing.T) {
logger := testlog.Logger(t, log.LevelError)
seq, deps := createSequencer(logger)
testClock := clock.NewSimpleClock()
seq.timeNow = testClock.Now
testClock.SetTime(30000)
emitter := &testutils.MockEmitter{}
seq.AttachEmitter(emitter)
deps.conductor.leader = true
emitter.ExpectOnce(engine.ForkchoiceRequestEvent{})
require.NoError(t, seq.Init(context.Background(), false))
emitter.AssertExpectations(t)
require.False(t, deps.conductor.closed, "conductor is ready")
require.True(t, deps.asyncGossip.started, "async gossip is always started on initialization")
require.False(t, deps.seqState.active, "sequencer not active yet")
head := eth.L2BlockRef{
Hash: common.Hash{0x22},
Number: 100,
L1Origin: eth.BlockID{
Hash: common.Hash{0x11, 0xa},
Number: 1000,
},
Time: uint64(testClock.Now().Unix()),
}
seq.OnEvent(engine.ForkchoiceUpdateEvent{UnsafeL2Head: head})
require.NoError(t, seq.Start(context.Background(), head.Hash))
require.True(t, seq.Active())
require.True(t, deps.seqState.active, "sequencer signaled it is active")
// sequencer is active now, wants to build.
_, ok := seq.NextAction()
require.True(t, ok)
// pretend we progress to the next L1 origin, catching up with the L2 time
l1Origin := eth.L1BlockRef{
Hash: common.Hash{0x11, 0xb},
ParentHash: head.L1Origin.Hash,
Number: head.L1Origin.Number + 1,
Time: head.Time + 2,
}
deps.l1OriginSelector.l1OriginFn = func(l2Head eth.L2BlockRef) (eth.L1BlockRef, error) {
return l1Origin, nil
}
var sentAttributes *derive.AttributesWithParent
emitter.ExpectOnceRun(func(ev event.Event) {
x, ok := ev.(engine.BuildStartEvent)
require.True(t, ok)
require.Equal(t, head, x.Attributes.Parent)
require.Equal(t, head.Time+deps.cfg.BlockTime, uint64(x.Attributes.Attributes.Timestamp))
require.Equal(t, eth.L1BlockRef{}, x.Attributes.DerivedFrom)
sentAttributes = x.Attributes
})
seq.OnEvent(SequencerActionEvent{})
emitter.AssertExpectations(t)
// Now report the block was started
startedTime := time.Unix(int64(head.Time), 0).Add(time.Millisecond * 150)
testClock.Set(startedTime)
payloadInfo := eth.PayloadInfo{
ID: eth.PayloadID{0x42},
Timestamp: head.Time + deps.cfg.BlockTime,
}
seq.OnEvent(engine.BuildStartedEvent{
Info: payloadInfo,
BuildStarted: startedTime,
Parent: head,
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
})
_, ok = seq.NextAction()
require.True(t, ok, "must be ready to seal the block now")
emitter.ExpectOnce(engine.BuildSealEvent{
Info: payloadInfo,
BuildStarted: startedTime,
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
})
seq.OnEvent(SequencerActionEvent{})
emitter.AssertExpectations(t)
_, ok = seq.NextAction()
require.False(t, ok, "cannot act until sealing completes/fails")
payloadEnvelope := ð.ExecutionPayloadEnvelope{
ParentBeaconBlockRoot: sentAttributes.Attributes.ParentBeaconBlockRoot,
ExecutionPayload: ð.ExecutionPayload{
ParentHash: head.Hash,
FeeRecipient: sentAttributes.Attributes.SuggestedFeeRecipient,
BlockNumber: eth.Uint64Quantity(sentAttributes.Parent.Number + 1),
BlockHash: common.Hash{0x12, 0x34},
Timestamp: sentAttributes.Attributes.Timestamp,
Transactions: sentAttributes.Attributes.Transactions,
// Not all attributes matter to sequencer. We can leave these nil.
},
}
payloadRef := eth.L2BlockRef{
Hash: payloadEnvelope.ExecutionPayload.BlockHash,
Number: uint64(payloadEnvelope.ExecutionPayload.BlockNumber),
ParentHash: payloadEnvelope.ExecutionPayload.ParentHash,
Time: uint64(payloadEnvelope.ExecutionPayload.Timestamp),
L1Origin: l1Origin.ID(),
SequenceNumber: 0,
}
emitter.ExpectOnce(engine.PayloadProcessEvent{
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
Envelope: payloadEnvelope,
Ref: payloadRef,
})
// And report back the sealing result to the engine
seq.OnEvent(engine.BuildSealedEvent{
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
Info: payloadInfo,
Envelope: payloadEnvelope,
Ref: payloadRef,
})
// The sequencer should start processing the payload
emitter.AssertExpectations(t)
// But also optimistically give it to the conductor and the async gossip
require.Equal(t, payloadEnvelope, deps.conductor.committed, "must commit to conductor")
require.Equal(t, payloadEnvelope, deps.asyncGossip.payload, "must send to async gossip")
_, ok = seq.NextAction()
require.False(t, ok, "optimistically published, but not ready to sequence next, until local processing completes")
// attempting to stop block building here should timeout, because the sealed block is different from the latestHead
ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
defer cancel()
_, err := seq.Stop(ctx)
require.Error(t, err, "stop should have timed out")
require.ErrorIs(t, err, ctx.Err())
// reset latestSealed to the previous head
emitter.ExpectOnce(engine.PayloadProcessEvent{
Envelope: payloadEnvelope,
Ref: head,
})
seq.OnEvent(engine.BuildSealedEvent{
Info: payloadInfo,
Envelope: payloadEnvelope,
Ref: head,
})
emitter.AssertExpectations(t)
// Now we stop the block building,
// before successful local processing of the committed block!
stopHead, err := seq.Stop(context.Background())
require.NoError(t, err)
require.Equal(t, head.Hash, stopHead, "sequencer should not have accepted any new block yet")
require.False(t, deps.seqState.active, "sequencer signaled it is no longer active")
// Async-gossip will try to publish this committed block
require.NotNil(t, deps.asyncGossip.payload, "still holding on to async-gossip block")
// Now let's say another sequencer built a bunch of blocks,
// can we continue from there? We'll have to wipe the old in-flight block,
// if we continue on top of a chain that had it already included a while ago.
// Signal the new chain we are building on
testClock.Set(testClock.Now().Add(time.Second * 100 * 2))
newL1Origin := eth.L1BlockRef{
Hash: common.Hash{0x11, 0x11, 0x44},
ParentHash: head.L1Origin.Hash,
Number: head.L1Origin.Number + 50,
Time: uint64(testClock.Now().Unix()),
}
newHead := eth.L2BlockRef{
Hash: common.Hash{0x44},
Number: head.Number + 100,
L1Origin: newL1Origin.ID(),
Time: uint64(testClock.Now().Unix()),
}
seq.OnEvent(engine.ForkchoiceUpdateEvent{UnsafeL2Head: newHead})
// Regression check: async-gossip is cleared upon sequencer un-pause.
// We could clear it earlier. But absolutely have to clear it upon Start(),
// to not continue from this older point.
require.NotNil(t, deps.asyncGossip.payload, "async-gossip still not cleared")
// start sequencing on top of the new chain
require.NoError(t, seq.Start(context.Background(), newHead.Hash), "must continue from new block")
// regression check: no stale async gossip is continued
require.Nil(t, deps.asyncGossip.payload, "async gossip should be cleared on Start")
// Start building the block with the new L1 origin
deps.l1OriginSelector.l1OriginFn = func(l2Head eth.L2BlockRef) (eth.L1BlockRef, error) {
return newL1Origin, nil
}
// Sequencer action, assert we build on top of something new,
// and don't try to seal what was previously.
_, ok = seq.NextAction()
require.True(t, ok, "ready to sequence again")
// start, not seal, when continuing to sequence.
emitter.ExpectOnceRun(func(ev event.Event) {
buildEv, ok := ev.(engine.BuildStartEvent)
require.True(t, ok)
require.Equal(t, newHead, buildEv.Attributes.Parent, "build on the new L2 head")
})
seq.OnEvent(SequencerActionEvent{})
emitter.AssertExpectations(t)
}
func TestSequencerBuild(t *testing.T) {
logger := testlog.Logger(t, log.LevelError)
seq, deps := createSequencer(logger)
testClock := clock.NewSimpleClock()
seq.timeNow = testClock.Now
testClock.SetTime(30000)
emitter := &testutils.MockEmitter{}
seq.AttachEmitter(emitter)
// Init will request a forkchoice update
emitter.ExpectOnce(engine.ForkchoiceRequestEvent{})
require.NoError(t, seq.Init(context.Background(), true))
emitter.AssertExpectations(t)
require.True(t, seq.Active(), "started in active mode")
// It will request a forkchoice update, it needs the head before being able to build on top of it
emitter.ExpectOnce(engine.ForkchoiceRequestEvent{})
seq.OnEvent(SequencerActionEvent{})
emitter.AssertExpectations(t)
// Now send the forkchoice data, for the sequencer to learn what to build on top of.
head := eth.L2BlockRef{
Hash: common.Hash{0x22},
Number: 100,
L1Origin: eth.BlockID{
Hash: common.Hash{0x11, 0xa},
Number: 1000,
},
Time: uint64(testClock.Now().Unix()),
}
seq.OnEvent(engine.ForkchoiceUpdateEvent{UnsafeL2Head: head})
emitter.AssertExpectations(t)
// pretend we progress to the next L1 origin, catching up with the L2 time
l1Origin := eth.L1BlockRef{
Hash: common.Hash{0x11, 0xb},
ParentHash: common.Hash{0x11, 0xa},
Number: 1001,
Time: 29998,
}
deps.l1OriginSelector.l1OriginFn = func(l2Head eth.L2BlockRef) (eth.L1BlockRef, error) {
return l1Origin, nil
}
var sentAttributes *derive.AttributesWithParent
emitter.ExpectOnceRun(func(ev event.Event) {
x, ok := ev.(engine.BuildStartEvent)
require.True(t, ok)
require.Equal(t, head, x.Attributes.Parent)
require.Equal(t, head.Time+deps.cfg.BlockTime, uint64(x.Attributes.Attributes.Timestamp))
require.Equal(t, eth.L1BlockRef{}, x.Attributes.DerivedFrom)
sentAttributes = x.Attributes
})
seq.OnEvent(SequencerActionEvent{})
emitter.AssertExpectations(t)
// pretend we are already 150ms into the block-window when starting building
startedTime := time.Unix(int64(head.Time), 0).Add(time.Millisecond * 150)
testClock.Set(startedTime)
payloadInfo := eth.PayloadInfo{
ID: eth.PayloadID{0x42},
Timestamp: head.Time + deps.cfg.BlockTime,
}
seq.OnEvent(engine.BuildStartedEvent{
Info: payloadInfo,
BuildStarted: startedTime,
Parent: head,
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
})
// The sealing should now be scheduled as next action.
// We expect to seal just before the block-time boundary, leaving enough time for the sealing itself.
sealTargetTime, ok := seq.NextAction()
require.True(t, ok)
buildDuration := sealTargetTime.Sub(time.Unix(int64(head.Time), 0))
require.Equal(t, (time.Duration(deps.cfg.BlockTime)*time.Second)-sealingDuration, buildDuration)
// Now trigger the sequencer to start sealing
emitter.ExpectOnce(engine.BuildSealEvent{
Info: payloadInfo,
BuildStarted: startedTime,
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
})
seq.OnEvent(SequencerActionEvent{})
emitter.AssertExpectations(t)
_, ok = seq.NextAction()
require.False(t, ok, "cannot act until sealing completes/fails")
payloadEnvelope := ð.ExecutionPayloadEnvelope{
ParentBeaconBlockRoot: sentAttributes.Attributes.ParentBeaconBlockRoot,
ExecutionPayload: ð.ExecutionPayload{
ParentHash: head.Hash,
FeeRecipient: sentAttributes.Attributes.SuggestedFeeRecipient,
BlockNumber: eth.Uint64Quantity(sentAttributes.Parent.Number + 1),
BlockHash: common.Hash{0x12, 0x34},
Timestamp: sentAttributes.Attributes.Timestamp,
Transactions: sentAttributes.Attributes.Transactions,
// Not all attributes matter to sequencer. We can leave these nil.
},
}
payloadRef := eth.L2BlockRef{
Hash: payloadEnvelope.ExecutionPayload.BlockHash,
Number: uint64(payloadEnvelope.ExecutionPayload.BlockNumber),
ParentHash: payloadEnvelope.ExecutionPayload.ParentHash,
Time: uint64(payloadEnvelope.ExecutionPayload.Timestamp),
L1Origin: l1Origin.ID(),
SequenceNumber: 0,
}
emitter.ExpectOnce(engine.PayloadProcessEvent{
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
Envelope: payloadEnvelope,
Ref: payloadRef,
})
// And report back the sealing result to the engine
seq.OnEvent(engine.BuildSealedEvent{
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
Info: payloadInfo,
Envelope: payloadEnvelope,
Ref: payloadRef,
})
// The sequencer should start processing the payload
emitter.AssertExpectations(t)
// But also optimistically give it to the conductor and the async gossip
require.Equal(t, payloadEnvelope, deps.conductor.committed, "must commit to conductor")
require.Equal(t, payloadEnvelope, deps.asyncGossip.payload, "must send to async gossip")
_, ok = seq.NextAction()
require.False(t, ok, "optimistically published, but not ready to sequence next, until local processing completes")
// Mock that the processing was successful
seq.OnEvent(engine.PayloadSuccessEvent{
IsLastInSpan: false,
DerivedFrom: eth.L1BlockRef{},
Envelope: payloadEnvelope,
Ref: payloadRef,
})
require.Nil(t, deps.asyncGossip.payload, "async gossip should have cleared,"+
" after previous publishing and now having persisted the block ourselves")
_, ok = seq.NextAction()
require.False(t, ok, "published and processed, but not canonical yet. Cannot proceed until then.")
// Once the forkchoice update identifies the processed block
// as canonical we can proceed to the next sequencer cycle iteration.
// Pretend we only completed processing the block 120 ms into the next block time window.
// (This is why we publish optimistically)
testClock.Set(time.Unix(int64(payloadRef.Time), 0).Add(time.Millisecond * 120))
seq.OnEvent(engine.ForkchoiceUpdateEvent{
UnsafeL2Head: payloadRef,
SafeL2Head: eth.L2BlockRef{},
FinalizedL2Head: eth.L2BlockRef{},
})
nextTime, ok := seq.NextAction()
require.True(t, ok, "ready to build next block")
require.Equal(t, testClock.Now(), nextTime, "start asap on the next block")
}
type sequencerTestDeps struct {
cfg *rollup.Config
attribBuilder *FakeAttributesBuilder
l1OriginSelector *FakeL1OriginSelector
seqState *BasicSequencerStateListener
conductor *FakeConductor
asyncGossip *FakeAsyncGossip
}
func createSequencer(log log.Logger) (*Sequencer, *sequencerTestDeps) {
rng := rand.New(rand.NewSource(123))
cfg := &rollup.Config{
Genesis: rollup.Genesis{
L1: eth.BlockID{
Hash: testutils.RandomHash(rng),
Number: 3000000,
},
L2: eth.BlockID{
Hash: testutils.RandomHash(rng),
Number: 0,
},
L2Time: 10000000,
SystemConfig: eth.SystemConfig{},
},
BlockTime: 2,
MaxSequencerDrift: 15 * 60,
RegolithTime: new(uint64),
CanyonTime: new(uint64),
DeltaTime: new(uint64),
EcotoneTime: new(uint64),
FjordTime: new(uint64),
}
deps := &sequencerTestDeps{
cfg: cfg,
attribBuilder: &FakeAttributesBuilder{cfg: cfg, rng: rng},
l1OriginSelector: &FakeL1OriginSelector{
l1OriginFn: func(l2Head eth.L2BlockRef) (eth.L1BlockRef, error) {
panic("override this")
},
},
seqState: &BasicSequencerStateListener{},
conductor: &FakeConductor{},
asyncGossip: &FakeAsyncGossip{},
}
seq := NewSequencer(context.Background(), log, cfg, deps.attribBuilder,
deps.l1OriginSelector, deps.seqState, deps.conductor,
deps.asyncGossip, metrics.NoopMetrics)
// We create mock payloads, with the epoch-id as tx[0], rather than proper L1Block-info deposit tx.
seq.toBlockRef = func(rollupCfg *rollup.Config, payload *eth.ExecutionPayload) (eth.L2BlockRef, error) {
return eth.L2BlockRef{
Hash: payload.BlockHash,
Number: uint64(payload.BlockNumber),
ParentHash: payload.ParentHash,
Time: uint64(payload.Timestamp),
L1Origin: decodeID(payload.Transactions[0]),
SequenceNumber: 0,
}, nil
}
return seq, deps
}