go-ethereum/eth/catalyst/api.go

355 lines
16 KiB
Go

// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package catalyst implements the temporary eth1/eth2 RPC integration.
package catalyst
import (
"crypto/sha256"
"encoding/binary"
"errors"
"fmt"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"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"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/rpc"
)
// Register adds catalyst APIs to the full node.
func Register(stack *node.Node, backend *eth.Ethereum) error {
log.Warn("Catalyst mode enabled", "protocol", "eth")
stack.RegisterAPIs([]rpc.API{
{
Namespace: "engine",
Version: "1.0",
Service: NewConsensusAPI(backend),
Public: true,
Authenticated: true,
},
{
Namespace: "engine",
Version: "1.0",
Service: NewConsensusAPI(backend),
Public: true,
Authenticated: false,
},
})
return nil
}
type ConsensusAPI struct {
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.
// The underlying blockchain needs to have a valid terminal total difficulty set.
func NewConsensusAPI(eth *eth.Ethereum) *ConsensusAPI {
if eth.BlockChain().Config().TerminalTotalDifficulty == nil {
panic("Catalyst started without valid total difficulty")
}
return &ConsensusAPI{
eth: eth,
remoteBlocks: newHeaderQueue(),
localBlocks: newPayloadQueue(),
}
}
// ForkchoiceUpdatedV1 has several responsibilities:
// If the method is called with an empty head block:
// we return success, which can be used to check if the catalyst mode is enabled
// If the total difficulty was not reached:
// we return INVALID
// If the finalizedBlockHash is set:
// we check if we have the finalizedBlockHash in our db, if not we start a sync
// 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(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.STATUS_INVALID, nil // TODO(karalabe): Why does someone send us this?
}
// 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("Forkchoice requested unknown head", "hash", update.HeadBlockHash)
return beacon.STATUS_SYNCING, nil
}
// 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.STATUS_SYNCING, err
}
return beacon.STATUS_SYNCING, nil
}
// Block is known locally, just sanity check that the beacon client does not
// attempt to push us back to before the merge.
if block.Difficulty().BitLen() > 0 || block.NumberU64() == 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.STATUS_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{PayloadStatus: beacon.PayloadStatusV1{Status: beacon.INVALIDTERMINALBLOCK}, PayloadID: nil}, nil
}
}
if rawdb.ReadCanonicalHash(api.eth.ChainDb(), block.NumberU64()) != update.HeadBlockHash {
// Block is not canonical, set head.
if err := api.eth.BlockChain().SetChainHead(block); err != nil {
return beacon.STATUS_INVALID, err
}
} else {
// If the head block is already in our canonical chain, the beacon client is
// probably resyncing. Ignore the update.
log.Info("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())
}
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()
}
// TODO (MariusVanDerWijden): If the finalized block is not in our canonical tree, somethings wrong
finalBlock := api.eth.BlockChain().GetBlockByHash(update.FinalizedBlockHash)
if finalBlock == nil {
log.Warn("Final block not available in database", "hash", update.FinalizedBlockHash)
return beacon.STATUS_INVALID, errors.New("final block not available")
} else if rawdb.ReadCanonicalHash(api.eth.ChainDb(), finalBlock.NumberU64()) != update.FinalizedBlockHash {
log.Warn("Final block not in canonical chain", "number", block.NumberU64(), "hash", update.HeadBlockHash)
return beacon.STATUS_INVALID, errors.New("final block not canonical")
}
}
// TODO (MariusVanDerWijden): Check if the safe block hash is in our canonical tree, if not somethings wrong
if update.SafeBlockHash != (common.Hash{}) {
safeBlock := api.eth.BlockChain().GetBlockByHash(update.SafeBlockHash)
if safeBlock == nil {
log.Warn("Safe block not available in database")
return beacon.STATUS_INVALID, errors.New("safe head not available")
}
if rawdb.ReadCanonicalHash(api.eth.ChainDb(), safeBlock.NumberU64()) != update.SafeBlockHash {
log.Warn("Safe block not in canonical chain")
return beacon.STATUS_INVALID, errors.New("safe head not canonical")
}
}
// 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 {
log.Info("Creating new payload for sealing")
start := time.Now()
data, err := api.assembleBlock(update.HeadBlockHash, payloadAttributes)
if err != nil {
log.Error("Failed to create sealing payload", "err", err)
return api.validForkChoiceResponse(nil), err // valid setHead, invalid payload
}
id := computePayloadId(update.HeadBlockHash, payloadAttributes)
api.localBlocks.put(id, data)
log.Info("Created payload for sealing", "id", id, "elapsed", time.Since(start))
return api.validForkChoiceResponse(&id), nil
}
return api.validForkChoiceResponse(nil), nil
}
// validForkChoiceResponse returns the ForkChoiceResponse{VALID}
// with the latest valid hash and an optional payloadID.
func (api *ConsensusAPI) validForkChoiceResponse(id *beacon.PayloadID) beacon.ForkChoiceResponse {
currentHash := api.eth.BlockChain().CurrentBlock().Hash()
return beacon.ForkChoiceResponse{
PayloadStatus: beacon.PayloadStatusV1{Status: beacon.VALID, LatestValidHash: &currentHash},
PayloadID: id,
}
}
// ExchangeTransitionConfigurationV1 checks the given configuration against
// the configuration of the node.
func (api *ConsensusAPI) ExchangeTransitionConfigurationV1(config beacon.TransitionConfigurationV1) (*beacon.TransitionConfigurationV1, error) {
if config.TerminalTotalDifficulty == nil {
return nil, errors.New("invalid terminal total difficulty")
}
ttd := api.eth.BlockChain().Config().TerminalTotalDifficulty
if ttd.Cmp(config.TerminalTotalDifficulty.ToInt()) != 0 {
log.Warn("Invalid TTD configured", "geth", config.TerminalTotalDifficulty, "beacon", ttd)
return nil, fmt.Errorf("invalid ttd: execution %v consensus %v", config.TerminalTotalDifficulty, ttd)
}
if config.TerminalBlockHash != (common.Hash{}) {
if hash := api.eth.BlockChain().GetCanonicalHash(uint64(config.TerminalBlockNumber)); hash == config.TerminalBlockHash {
return &beacon.TransitionConfigurationV1{
TerminalTotalDifficulty: (*hexutil.Big)(ttd),
TerminalBlockHash: config.TerminalBlockHash,
TerminalBlockNumber: config.TerminalBlockNumber,
}, nil
}
return nil, fmt.Errorf("invalid terminal block hash")
}
return &beacon.TransitionConfigurationV1{TerminalTotalDifficulty: (*hexutil.Big)(ttd)}, 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.localBlocks.get(payloadID)
if data == nil {
return nil, &beacon.UnknownPayload
}
return data, nil
}
// NewPayloadV1 creates an Eth1 block, inserts it in the chain, and returns the status of the chain.
func (api *ConsensusAPI) NewPayloadV1(params beacon.ExecutableDataV1) (beacon.PayloadStatusV1, error) {
log.Trace("Engine API request received", "method", "ExecutePayload", "number", params.Number, "hash", params.BlockHash)
block, err := beacon.ExecutableDataToBlock(params)
if err != nil {
log.Debug("Invalid NewPayload params", "params", params, "error", err)
return beacon.PayloadStatusV1{Status: beacon.INVALIDBLOCKHASH}, 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)))
hash := block.Hash()
return beacon.PayloadStatusV1{Status: beacon.VALID, LatestValidHash: &hash}, nil
}
// 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.PayloadStatusV1{Status: beacon.SYNCING}, 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.PayloadStatusV1{Status: beacon.ACCEPTED}, nil
}
// 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 {
log.Warn("Ignoring pre-merge payload", "number", params.Number, "hash", params.BlockHash, "td", td, "ttd", ttd)
return beacon.PayloadStatusV1{Status: beacon.INVALIDTERMINALBLOCK}, nil
}
if block.Time() <= parent.Time() {
log.Warn("Invalid timestamp", "parent", block.Time(), "block", block.Time())
return api.invalid(errors.New("invalid timestamp")), nil
}
log.Trace("Inserting block without sethead", "hash", block.Hash(), "number", block.Number)
if err := api.eth.BlockChain().InsertBlockWithoutSetHead(block); err != nil {
log.Warn("NewPayloadV1: inserting block failed", "error", err)
return api.invalid(err), nil
}
// 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()
}
hash := block.Hash()
return beacon.PayloadStatusV1{Status: beacon.VALID, LatestValidHash: &hash}, nil
}
// computePayloadId computes a pseudo-random payloadid, based on the parameters.
func computePayloadId(headBlockHash common.Hash, params *beacon.PayloadAttributesV1) beacon.PayloadID {
// Hash
hasher := sha256.New()
hasher.Write(headBlockHash[:])
binary.Write(hasher, binary.BigEndian, params.Timestamp)
hasher.Write(params.Random[:])
hasher.Write(params.SuggestedFeeRecipient[:])
var out beacon.PayloadID
copy(out[:], hasher.Sum(nil)[:8])
return out
}
// invalid returns a response "INVALID" with the latest valid hash set to the current head.
func (api *ConsensusAPI) invalid(err error) beacon.PayloadStatusV1 {
currentHash := api.eth.BlockChain().CurrentHeader().Hash()
errorMsg := err.Error()
return beacon.PayloadStatusV1{Status: beacon.INVALID, LatestValidHash: &currentHash, ValidationError: &errorMsg}
}
// assembleBlock creates a new block and returns the "execution
// data" required for beacon clients to process the new block.
func (api *ConsensusAPI) assembleBlock(parentHash common.Hash, params *beacon.PayloadAttributesV1) (*beacon.ExecutableDataV1, error) {
log.Info("Producing block", "parentHash", parentHash)
block, err := api.eth.Miner().GetSealingBlock(parentHash, params.Timestamp, params.SuggestedFeeRecipient, params.Random)
if err != nil {
return nil, err
}
return beacon.BlockToExecutableData(block), nil
}
// Used in tests to add a the list of transactions from a block to the tx pool.
func (api *ConsensusAPI) insertTransactions(txs types.Transactions) error {
for _, tx := range txs {
api.eth.TxPool().AddLocal(tx)
}
return nil
}