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eth/downloader: implement beacon sync (#23982)

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* eth/downloader: implement beacon sync

* eth/downloader: fix a crash if the beacon chain is reduced in length

* eth/downloader: fix beacon sync start/stop thrashing data race

* eth/downloader: use a non-nil pivot even in degenerate sync requests

* eth/downloader: don't touch internal state on beacon Head retrieval

* eth/downloader: fix spelling mistakes

* eth/downloader: fix some typos

* eth: integrate legacy/beacon sync switchover and UX

* eth: handle UX wise being stuck on post-merge TTD

* core, eth: integrate the beacon client with the beacon sync

* eth/catalyst: make some warning messages nicer

* eth/downloader: remove Ethereum 1&2 notions in favor of merge

* core/beacon, eth: clean up engine API returns a bit

* eth/downloader: add skeleton extension tests

* eth/catalyst: keep non-kiln spec, handle mining on ttd

* eth/downloader: add beacon header retrieval tests

* eth: fixed spelling, commented failing tests out

* eth/downloader: review fixes

* eth/downloader: drop peers failing to deliver beacon headers

* core/rawdb: track beacon sync data in db inspect

* eth: fix review concerns

* internal/web3ext: nit

Co-authored-by: Marius van der Wijden <m.vanderwijden@live.de>
This commit is contained in:
Péter Szilágyi
2022-03-11 14:14:45 +02:00
committed by GitHub
parent 1b58e42802
commit 8f66ea3786
22 changed files with 2918 additions and 303 deletions
Download Patch File Download Diff File Expand all files Collapse all files

205
eth/catalyst/api.go
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@ -20,10 +20,13 @@ package catalyst
import (
"crypto/sha256"
"encoding/binary"
"errors"
"fmt"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/beacon"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/log"
@ -54,8 +57,9 @@ func Register(stack *node.Node, backend *eth.Ethereum) error {
}
type ConsensusAPI struct {
eth *eth.Ethereum
preparedBlocks *payloadQueue // preparedBlocks caches payloads (*ExecutableDataV1) by payload ID (PayloadID)
eth *eth.Ethereum
remoteBlocks *headerQueue // Cache of remote payloads received
localBlocks *payloadQueue // Cache of local payloads generated
}
// NewConsensusAPI creates a new consensus api for the given backend.
@ -65,8 +69,9 @@ func NewConsensusAPI(eth *eth.Ethereum) *ConsensusAPI {
panic("Catalyst started without valid total difficulty")
}
return &ConsensusAPI{
eth: eth,
preparedBlocks: newPayloadQueue(),
eth: eth,
remoteBlocks: newHeaderQueue(),
localBlocks: newPayloadQueue(),
}
}
@ -80,47 +85,99 @@ func NewConsensusAPI(eth *eth.Ethereum) *ConsensusAPI {
// We try to set our blockchain to the headBlock
// If there are payloadAttributes:
// we try to assemble a block with the payloadAttributes and return its payloadID
func (api *ConsensusAPI) ForkchoiceUpdatedV1(heads beacon.ForkchoiceStateV1, payloadAttributes *beacon.PayloadAttributesV1) (beacon.ForkChoiceResponse, error) {
log.Trace("Engine API request received", "method", "ForkChoiceUpdated", "head", heads.HeadBlockHash, "finalized", heads.FinalizedBlockHash, "safe", heads.SafeBlockHash)
if heads.HeadBlockHash == (common.Hash{}) {
return beacon.ForkChoiceResponse{Status: beacon.SUCCESS.Status, PayloadID: nil}, nil
func (api *ConsensusAPI) ForkchoiceUpdatedV1(update beacon.ForkchoiceStateV1, payloadAttributes *beacon.PayloadAttributesV1) (beacon.ForkChoiceResponse, error) {
log.Trace("Engine API request received", "method", "ForkChoiceUpdated", "head", update.HeadBlockHash, "finalized", update.FinalizedBlockHash, "safe", update.SafeBlockHash)
if update.HeadBlockHash == (common.Hash{}) {
log.Warn("Forkchoice requested update to zero hash")
return beacon.ForkChoiceResponse{Status: beacon.INVALID}, nil // TODO(karalabe): Why does someone send us this?
}
if err := api.checkTerminalTotalDifficulty(heads.HeadBlockHash); err != nil {
if block := api.eth.BlockChain().GetBlockByHash(heads.HeadBlockHash); block == nil {
// TODO (MariusVanDerWijden) trigger sync
return beacon.SYNCING, nil
// Check whether we have the block yet in our database or not. If not, we'll
// need to either trigger a sync, or to reject this forkchoice update for a
// reason.
block := api.eth.BlockChain().GetBlockByHash(update.HeadBlockHash)
if block == nil {
// If the head hash is unknown (was not given to us in a newPayload request),
// we cannot resolve the header, so not much to do. This could be extended in
// the future to resolve from the `eth` network, but it's an unexpected case
// that should be fixed, not papered over.
header := api.remoteBlocks.get(update.HeadBlockHash)
if header == nil {
log.Warn("Forkcoice requested unknown head", "hash", update.HeadBlockHash)
return beacon.ForkChoiceResponse{Status: beacon.INVALID}, errors.New("head hash never advertised")
}
return beacon.INVALID, err
// Header advertised via a past newPayload request. Start syncing to it.
// Before we do however, make sure any legacy sync in switched off so we
// don't accidentally have 2 cycles running.
if merger := api.eth.Merger(); !merger.TDDReached() {
merger.ReachTTD()
api.eth.Downloader().Cancel()
}
log.Info("Forkchoice requested sync to new head", "number", header.Number, "hash", header.Hash())
if err := api.eth.Downloader().BeaconSync(api.eth.SyncMode(), header); err != nil {
return beacon.ForkChoiceResponse{Status: beacon.SYNCING}, err
}
return beacon.ForkChoiceResponse{Status: beacon.SYNCING}, nil
}
// If the finalized block is set, check if it is in our blockchain
if heads.FinalizedBlockHash != (common.Hash{}) {
if block := api.eth.BlockChain().GetBlockByHash(heads.FinalizedBlockHash); block == nil {
// TODO (MariusVanDerWijden) trigger sync
return beacon.SYNCING, nil
// Block is known locally, just sanity check that the beacon client does not
// attempt to push as back to before the merge.
if block.Difficulty().BitLen() > 0 {
var (
td = api.eth.BlockChain().GetTd(update.HeadBlockHash, block.NumberU64())
ptd = api.eth.BlockChain().GetTd(block.ParentHash(), block.NumberU64()-1)
ttd = api.eth.BlockChain().Config().TerminalTotalDifficulty
)
if td == nil || (block.NumberU64() > 0 && ptd == nil) {
log.Error("TDs unavailable for TTD check", "number", block.NumberU64(), "hash", update.HeadBlockHash, "td", td, "parent", block.ParentHash(), "ptd", ptd)
return beacon.ForkChoiceResponse{Status: beacon.INVALID}, errors.New("TDs unavailable for TDD check")
}
if td.Cmp(ttd) < 0 || (block.NumberU64() > 0 && ptd.Cmp(ttd) >= 0) {
log.Error("Refusing beacon update to pre-merge", "number", block.NumberU64(), "hash", update.HeadBlockHash, "diff", block.Difficulty(), "age", common.PrettyAge(time.Unix(int64(block.Time()), 0)))
return beacon.ForkChoiceResponse{Status: beacon.INVALID}, errors.New("refusing reorg to pre-merge")
}
}
// SetHead
if err := api.setHead(heads.HeadBlockHash); err != nil {
return beacon.INVALID, err
// If the head block is already in our canonical chain, the beacon client is
// probably resyncing. Ignore the update.
if rawdb.ReadCanonicalHash(api.eth.ChainDb(), block.NumberU64()) == update.HeadBlockHash {
log.Warn("Ignoring beacon update to old head", "number", block.NumberU64(), "hash", update.HeadBlockHash, "age", common.PrettyAge(time.Unix(int64(block.Time()), 0)), "have", api.eth.BlockChain().CurrentBlock().NumberU64())
return beacon.ForkChoiceResponse{Status: beacon.VALID}, nil
}
// Assemble block (if needed). It only works for full node.
if err := api.eth.BlockChain().SetChainHead(block); err != nil {
return beacon.ForkChoiceResponse{Status: beacon.INVALID}, err
}
api.eth.SetSynced()
// If the beacon client also advertised a finalized block, mark the local
// chain final and completely in PoS mode.
if update.FinalizedBlockHash != (common.Hash{}) {
if merger := api.eth.Merger(); !merger.PoSFinalized() {
merger.FinalizePoS()
}
}
// If payload generation was requested, create a new block to be potentially
// sealed by the beacon client. The payload will be requested later, and we
// might replace it arbitrarily many times in between.
if payloadAttributes != nil {
data, err := api.assembleBlock(heads.HeadBlockHash, payloadAttributes)
log.Info("Creating new payload for sealing")
start := time.Now()
data, err := api.assembleBlock(update.HeadBlockHash, payloadAttributes)
if err != nil {
return beacon.INVALID, err
log.Error("Failed to create sealing payload", "err", err)
return beacon.ForkChoiceResponse{Status: beacon.VALID}, err // Valid as setHead was accepted
}
id := computePayloadId(heads.HeadBlockHash, payloadAttributes)
api.preparedBlocks.put(id, data)
log.Info("Created payload", "payloadID", id)
return beacon.ForkChoiceResponse{Status: beacon.SUCCESS.Status, PayloadID: &id}, nil
id := computePayloadId(update.HeadBlockHash, payloadAttributes)
api.localBlocks.put(id, data)
log.Info("Created payload for sealing", "id", id, "elapsed", time.Since(start))
return beacon.ForkChoiceResponse{Status: beacon.VALID, PayloadID: &id}, nil
}
return beacon.ForkChoiceResponse{Status: beacon.SUCCESS.Status, PayloadID: nil}, nil
return beacon.ForkChoiceResponse{Status: beacon.VALID}, nil
}
// GetPayloadV1 returns a cached payload by id.
func (api *ConsensusAPI) GetPayloadV1(payloadID beacon.PayloadID) (*beacon.ExecutableDataV1, error) {
log.Trace("Engine API request received", "method", "GetPayload", "id", payloadID)
data := api.preparedBlocks.get(payloadID)
data := api.localBlocks.get(payloadID)
if data == nil {
return nil, &beacon.UnknownPayload
}
@ -129,36 +186,65 @@ func (api *ConsensusAPI) GetPayloadV1(payloadID beacon.PayloadID) (*beacon.Execu
// ExecutePayloadV1 creates an Eth1 block, inserts it in the chain, and returns the status of the chain.
func (api *ConsensusAPI) ExecutePayloadV1(params beacon.ExecutableDataV1) (beacon.ExecutePayloadResponse, error) {
log.Trace("Engine API request received", "method", "ExecutePayload", params.BlockHash, "number", params.Number)
log.Trace("Engine API request received", "method", "ExecutePayload", "number", params.Number, "hash", params.BlockHash)
block, err := beacon.ExecutableDataToBlock(params)
if err != nil {
return api.invalid(), err
}
if !api.eth.BlockChain().HasBlock(block.ParentHash(), block.NumberU64()-1) {
/*
TODO (MariusVanDerWijden) reenable once sync is merged
if err := api.eth.Downloader().BeaconSync(api.eth.SyncMode(), block.Header()); err != nil {
return SYNCING, err
}
*/
// TODO (MariusVanDerWijden) we should return nil here not empty hash
return beacon.ExecutePayloadResponse{Status: beacon.SYNCING.Status, LatestValidHash: common.Hash{}}, nil
// If we already have the block locally, ignore the entire execution and just
// return a fake success.
if block := api.eth.BlockChain().GetBlockByHash(params.BlockHash); block != nil {
log.Warn("Ignoring already known beacon payload", "number", params.Number, "hash", params.BlockHash, "age", common.PrettyAge(time.Unix(int64(block.Time()), 0)))
return beacon.ExecutePayloadResponse{Status: beacon.VALID, LatestValidHash: block.Hash()}, nil
}
parent := api.eth.BlockChain().GetBlockByHash(params.ParentHash)
td := api.eth.BlockChain().GetTd(parent.Hash(), block.NumberU64()-1)
ttd := api.eth.BlockChain().Config().TerminalTotalDifficulty
// If the parent is missing, we - in theory - could trigger a sync, but that
// would also entail a reorg. That is problematic if multiple sibling blocks
// are being fed to us, and even more so, if some semi-distant uncle shortens
// our live chain. As such, payload execution will not permit reorgs and thus
// will not trigger a sync cycle. That is fine though, if we get a fork choice
// update after legit payload executions.
parent := api.eth.BlockChain().GetBlock(block.ParentHash(), block.NumberU64()-1)
if parent == nil {
// Stash the block away for a potential forced forckchoice update to it
// at a later time.
api.remoteBlocks.put(block.Hash(), block.Header())
// Although we don't want to trigger a sync, if there is one already in
// progress, try to extend if with the current payload request to relieve
// some strain from the forkchoice update.
if err := api.eth.Downloader().BeaconExtend(api.eth.SyncMode(), block.Header()); err == nil {
log.Debug("Payload accepted for sync extension", "number", params.Number, "hash", params.BlockHash)
return beacon.ExecutePayloadResponse{Status: beacon.SYNCING, LatestValidHash: api.eth.BlockChain().CurrentBlock().Hash()}, nil
}
// Either no beacon sync was started yet, or it rejected the delivered
// payload as non-integratable on top of the existing sync. We'll just
// have to rely on the beacon client to forcefully update the head with
// a forkchoice update request.
log.Warn("Ignoring payload with missing parent", "number", params.Number, "hash", params.BlockHash, "parent", params.ParentHash)
return beacon.ExecutePayloadResponse{Status: beacon.SYNCING, LatestValidHash: common.Hash{}}, nil // TODO(karalabe): Switch to ACCEPTED
}
// We have an existing parent, do some sanity checks to avoid the beacon client
// triggering too early
var (
td = api.eth.BlockChain().GetTd(parent.Hash(), parent.NumberU64())
ttd = api.eth.BlockChain().Config().TerminalTotalDifficulty
)
if td.Cmp(ttd) < 0 {
return api.invalid(), fmt.Errorf("can not execute payload on top of block with low td got: %v threshold %v", td, ttd)
log.Warn("Ignoring pre-merge payload", "number", params.Number, "hash", params.BlockHash, "td", td, "ttd", ttd)
return api.invalid(), fmt.Errorf("cannot execute payload on top of pre-merge blocks: td %v, ttd %v", td, ttd)
}
log.Trace("Inserting block without head", "hash", block.Hash(), "number", block.Number)
log.Trace("Inserting block without sethead", "hash", block.Hash(), "number", block.Number)
if err := api.eth.BlockChain().InsertBlockWithoutSetHead(block); err != nil {
return api.invalid(), err
}
// We've accepted a valid payload from the beacon client. Mark the local
// chain transitions to notify other subsystems (e.g. downloader) of the
// behavioral change.
if merger := api.eth.Merger(); !merger.TDDReached() {
merger.ReachTTD()
api.eth.Downloader().Cancel()
}
return beacon.ExecutePayloadResponse{Status: beacon.VALID.Status, LatestValidHash: block.Hash()}, nil
return beacon.ExecutePayloadResponse{Status: beacon.VALID, LatestValidHash: block.Hash()}, nil
}
// computePayloadId computes a pseudo-random payloadid, based on the parameters.
@ -176,7 +262,7 @@ func computePayloadId(headBlockHash common.Hash, params *beacon.PayloadAttribute
// invalid returns a response "INVALID" with the latest valid hash set to the current head.
func (api *ConsensusAPI) invalid() beacon.ExecutePayloadResponse {
return beacon.ExecutePayloadResponse{Status: beacon.INVALID.Status, LatestValidHash: api.eth.BlockChain().CurrentHeader().Hash()}
return beacon.ExecutePayloadResponse{Status: beacon.INVALID, LatestValidHash: api.eth.BlockChain().CurrentHeader().Hash()}
}
// assembleBlock creates a new block and returns the "execution
@ -214,26 +300,3 @@ func (api *ConsensusAPI) checkTerminalTotalDifficulty(head common.Hash) error {
}
return nil
}
// setHead is called to perform a force choice.
func (api *ConsensusAPI) setHead(newHead common.Hash) error {
log.Info("Setting head", "head", newHead)
headBlock := api.eth.BlockChain().CurrentBlock()
if headBlock.Hash() == newHead {
return nil
}
newHeadBlock := api.eth.BlockChain().GetBlockByHash(newHead)
if newHeadBlock == nil {
return &beacon.GenericServerError
}
if err := api.eth.BlockChain().SetChainHead(newHeadBlock); err != nil {
return err
}
// Trigger the transition if it's the first `NewHead` event.
if merger := api.eth.Merger(); !merger.PoSFinalized() {
merger.FinalizePoS()
}
// TODO (MariusVanDerWijden) are we really synced now?
api.eth.SetSynced()
return nil
}