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fakepos.go
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fakepos.go
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package geth
import (
"encoding/binary"
"math/big"
"math/rand"
"time"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/beacon/engine"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/catalyst"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum-optimism/optimism/op-service/clock"
opeth "github.com/ethereum-optimism/optimism/op-service/eth"
"github.com/ethereum-optimism/optimism/op-service/testutils"
)
type Beacon interface {
StoreBlobsBundle(slot uint64, bundle *engine.BlobsBundleV1) error
}
// fakePoS is a testing-only utility to attach to Geth,
// to build a fake proof-of-stake L1 chain with fixed block time and basic lagging safe/finalized blocks.
type fakePoS struct {
clock clock.Clock
eth *eth.Ethereum
log log.Logger
blockTime uint64
withdrawalsIndex uint64
finalizedDistance uint64
safeDistance uint64
engineAPI *catalyst.ConsensusAPI
sub ethereum.Subscription
beacon Beacon
}
func (f *fakePoS) FakeBeaconBlockRoot(time uint64) common.Hash {
var dat [8]byte
binary.LittleEndian.PutUint64(dat[:], time)
return crypto.Keccak256Hash(dat[:])
}
func (f *fakePoS) Start() error {
if advancing, ok := f.clock.(*clock.AdvancingClock); ok {
advancing.Start()
}
withdrawalsRNG := rand.New(rand.NewSource(450368975843)) // avoid generating the same address as any test
f.sub = event.NewSubscription(func(quit <-chan struct{}) error {
// poll every half a second: enough to catch up with any block time when ticks are missed
t := f.clock.NewTicker(time.Second / 2)
for {
select {
case now := <-t.Ch():
chain := f.eth.BlockChain()
head := chain.CurrentBlock()
finalized := chain.CurrentFinalBlock()
if finalized == nil { // fallback to genesis if nothing is finalized
finalized = chain.Genesis().Header()
}
safe := chain.CurrentSafeBlock()
if safe == nil { // fallback to finalized if nothing is safe
safe = finalized
}
if head.Number.Uint64() > f.finalizedDistance { // progress finalized block, if we can
finalized = f.eth.BlockChain().GetHeaderByNumber(head.Number.Uint64() - f.finalizedDistance)
}
if head.Number.Uint64() > f.safeDistance { // progress safe block, if we can
safe = f.eth.BlockChain().GetHeaderByNumber(head.Number.Uint64() - f.safeDistance)
}
// start building the block as soon as we are past the current head time
if head.Time >= uint64(now.Unix()) {
continue
}
newBlockTime := head.Time + f.blockTime
if time.Unix(int64(newBlockTime), 0).Add(5 * time.Minute).Before(f.clock.Now()) {
// We're a long way behind, let's skip some blocks...
newBlockTime = uint64(f.clock.Now().Unix())
}
// create some random withdrawals
withdrawals := make([]*types.Withdrawal, withdrawalsRNG.Intn(4))
for i := 0; i < len(withdrawals); i++ {
withdrawals[i] = &types.Withdrawal{
Index: f.withdrawalsIndex + uint64(i),
Validator: withdrawalsRNG.Uint64() % 100_000_000, // 100 million fake validators
Address: testutils.RandomAddress(withdrawalsRNG),
// in gwei, consensus-layer quirk. withdraw non-zero value up to 50 ETH
Amount: uint64(withdrawalsRNG.Intn(50_000_000_000) + 1),
}
}
attrs := &engine.PayloadAttributes{
Timestamp: newBlockTime,
Random: common.Hash{},
SuggestedFeeRecipient: head.Coinbase,
Withdrawals: withdrawals,
}
parentBeaconBlockRoot := f.FakeBeaconBlockRoot(head.Time) // parent beacon block root
isCancun := f.eth.BlockChain().Config().IsCancun(new(big.Int).SetUint64(head.Number.Uint64()+1), newBlockTime)
if isCancun {
attrs.BeaconRoot = &parentBeaconBlockRoot
}
fcState := engine.ForkchoiceStateV1{
HeadBlockHash: head.Hash(),
SafeBlockHash: safe.Hash(),
FinalizedBlockHash: finalized.Hash(),
}
var err error
var res engine.ForkChoiceResponse
if isCancun {
res, err = f.engineAPI.ForkchoiceUpdatedV3(fcState, attrs)
} else {
res, err = f.engineAPI.ForkchoiceUpdatedV2(fcState, attrs)
}
if err != nil {
f.log.Error("failed to start building L1 block", "err", err)
continue
}
if res.PayloadID == nil {
f.log.Error("failed to start block building", "res", res)
continue
}
// wait with sealing, if we are not behind already
delay := time.Unix(int64(newBlockTime), 0).Sub(f.clock.Now())
tim := f.clock.NewTimer(delay)
select {
case <-tim.Ch():
// no-op
case <-quit:
tim.Stop()
return nil
}
envelope, err := f.engineAPI.GetPayloadV3(*res.PayloadID)
if err != nil {
f.log.Error("failed to finish building L1 block", "err", err)
continue
}
blobHashes := make([]common.Hash, 0) // must be non-nil even when empty, due to geth engine API checks
for _, commitment := range envelope.BlobsBundle.Commitments {
if len(commitment) != 48 {
f.log.Error("got malformed kzg commitment from engine", "commitment", commitment)
break
}
blobHashes = append(blobHashes, opeth.KZGToVersionedHash(*(*[48]byte)(commitment)))
}
if len(blobHashes) != len(envelope.BlobsBundle.Commitments) {
f.log.Error("invalid or incomplete blob data", "collected", len(blobHashes), "engine", len(envelope.BlobsBundle.Commitments))
continue
}
if isCancun {
if _, err := f.engineAPI.NewPayloadV3(*envelope.ExecutionPayload, blobHashes, &parentBeaconBlockRoot); err != nil {
f.log.Error("failed to insert built L1 block", "err", err)
continue
}
} else {
if _, err := f.engineAPI.NewPayloadV2(*envelope.ExecutionPayload); err != nil {
f.log.Error("failed to insert built L1 block", "err", err)
continue
}
}
if envelope.BlobsBundle != nil {
slot := (envelope.ExecutionPayload.Timestamp - f.eth.BlockChain().Genesis().Time()) / f.blockTime
if f.beacon == nil {
f.log.Error("no blobs storage available")
continue
}
if err := f.beacon.StoreBlobsBundle(slot, envelope.BlobsBundle); err != nil {
f.log.Error("failed to persist blobs-bundle of block, not making block canonical now", "err", err)
continue
}
}
if _, err := f.engineAPI.ForkchoiceUpdatedV3(engine.ForkchoiceStateV1{
HeadBlockHash: envelope.ExecutionPayload.BlockHash,
SafeBlockHash: safe.Hash(),
FinalizedBlockHash: finalized.Hash(),
}, nil); err != nil {
f.log.Error("failed to make built L1 block canonical", "err", err)
continue
}
// Increment global withdrawals index in the CL.
// The EL doesn't really care about the value,
// but it's nice to mock something consistent with the CL specs.
f.withdrawalsIndex += uint64(len(withdrawals))
case <-quit:
return nil
}
}
})
return nil
}
func (f *fakePoS) Stop() error {
f.sub.Unsubscribe()
if advancing, ok := f.clock.(*clock.AdvancingClock); ok {
advancing.Stop()
}
return nil
}