plugeth/eth/catalyst/simulated_beacon.go

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// Copyright 2023 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
import (
"errors"
"fmt"
"sync"
"time"
"github.com/ethereum/go-ethereum/beacon/engine"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"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"
)
const devEpochLength = 32
// withdrawalQueue implements a FIFO queue which holds withdrawals that are
// pending inclusion.
type withdrawalQueue struct {
pending chan *types.Withdrawal
}
// add queues a withdrawal for future inclusion.
func (w *withdrawalQueue) add(withdrawal *types.Withdrawal) error {
select {
case w.pending <- withdrawal:
break
default:
return errors.New("withdrawal queue full")
}
return nil
}
// gatherPending returns a number of queued withdrawals up to a maximum count.
func (w *withdrawalQueue) gatherPending(maxCount int) []*types.Withdrawal {
withdrawals := []*types.Withdrawal{}
for {
select {
case withdrawal := <-w.pending:
withdrawals = append(withdrawals, withdrawal)
if len(withdrawals) == maxCount {
break
}
default:
return withdrawals
}
}
}
type SimulatedBeacon struct {
shutdownCh chan struct{}
eth *eth.Ethereum
period uint64
withdrawals withdrawalQueue
feeRecipient common.Address
feeRecipientLock sync.Mutex // lock gates concurrent access to the feeRecipient
engineAPI *ConsensusAPI
curForkchoiceState engine.ForkchoiceStateV1
lastBlockTime uint64
}
func NewSimulatedBeacon(period uint64, eth *eth.Ethereum) (*SimulatedBeacon, error) {
chainConfig := eth.APIBackend.ChainConfig()
if !chainConfig.IsDevMode {
return nil, errors.New("incompatible pre-existing chain configuration")
}
block := eth.BlockChain().CurrentBlock()
current := engine.ForkchoiceStateV1{
HeadBlockHash: block.Hash(),
SafeBlockHash: block.Hash(),
FinalizedBlockHash: block.Hash(),
}
engineAPI := NewConsensusAPI(eth)
// if genesis block, send forkchoiceUpdated to trigger transition to PoS
if block.Number.Sign() == 0 {
if _, err := engineAPI.ForkchoiceUpdatedV2(current, nil); err != nil {
return nil, err
}
}
return &SimulatedBeacon{
eth: eth,
period: period,
shutdownCh: make(chan struct{}),
engineAPI: engineAPI,
lastBlockTime: block.Time,
curForkchoiceState: current,
withdrawals: withdrawalQueue{make(chan *types.Withdrawal, 20)},
}, nil
}
func (c *SimulatedBeacon) setFeeRecipient(feeRecipient common.Address) {
c.feeRecipientLock.Lock()
c.feeRecipient = feeRecipient
c.feeRecipientLock.Unlock()
}
// Start invokes the SimulatedBeacon life-cycle function in a goroutine.
func (c *SimulatedBeacon) Start() error {
if c.period == 0 {
go c.loopOnDemand()
} else {
go c.loop()
}
return nil
}
// Stop halts the SimulatedBeacon service.
func (c *SimulatedBeacon) Stop() error {
close(c.shutdownCh)
return nil
}
// sealBlock initiates payload building for a new block and creates a new block
// with the completed payload.
func (c *SimulatedBeacon) sealBlock(withdrawals []*types.Withdrawal) error {
tstamp := uint64(time.Now().Unix())
if tstamp <= c.lastBlockTime {
tstamp = c.lastBlockTime + 1
}
c.feeRecipientLock.Lock()
feeRecipient := c.feeRecipient
c.feeRecipientLock.Unlock()
fcResponse, err := c.engineAPI.ForkchoiceUpdatedV2(c.curForkchoiceState, &engine.PayloadAttributes{
Timestamp: tstamp,
SuggestedFeeRecipient: feeRecipient,
Withdrawals: withdrawals,
})
if err != nil {
return fmt.Errorf("error calling forkchoice update: %v", err)
}
envelope, err := c.engineAPI.getPayload(*fcResponse.PayloadID, true)
if err != nil {
return fmt.Errorf("error retrieving payload: %v", err)
}
payload := envelope.ExecutionPayload
var finalizedHash common.Hash
if payload.Number%devEpochLength == 0 {
finalizedHash = payload.BlockHash
} else {
finalizedHash = c.eth.BlockChain().GetBlockByNumber((payload.Number - 1) / devEpochLength * devEpochLength).Hash()
}
// mark the payload as canon
if _, err = c.engineAPI.NewPayloadV2(*payload); err != nil {
return fmt.Errorf("failed to mark payload as canonical: %v", err)
}
c.curForkchoiceState = engine.ForkchoiceStateV1{
HeadBlockHash: payload.BlockHash,
SafeBlockHash: payload.BlockHash,
FinalizedBlockHash: finalizedHash,
}
// mark the block containing the payload as canonical
if _, err = c.engineAPI.ForkchoiceUpdatedV2(c.curForkchoiceState, nil); err != nil {
return fmt.Errorf("failed to mark block as canonical: %v", err)
}
c.lastBlockTime = payload.Timestamp
return nil
}
// loopOnDemand runs the block production loop for "on-demand" configuration (period = 0)
func (c *SimulatedBeacon) loopOnDemand() {
var (
newTxs = make(chan core.NewTxsEvent)
sub = c.eth.TxPool().SubscribeNewTxsEvent(newTxs)
)
defer sub.Unsubscribe()
for {
select {
case <-c.shutdownCh:
return
case w := <-c.withdrawals.pending:
withdrawals := append(c.withdrawals.gatherPending(9), w)
if err := c.sealBlock(withdrawals); err != nil {
log.Error("Error performing sealing-work", "err", err)
return
}
case <-newTxs:
withdrawals := c.withdrawals.gatherPending(10)
if err := c.sealBlock(withdrawals); err != nil {
log.Error("Error performing sealing-work", "err", err)
return
}
}
}
}
// loopOnDemand runs the block production loop for non-zero period configuration
func (c *SimulatedBeacon) loop() {
timer := time.NewTimer(0)
for {
select {
case <-c.shutdownCh:
return
case <-timer.C:
withdrawals := c.withdrawals.gatherPending(10)
if err := c.sealBlock(withdrawals); err != nil {
log.Error("Error performing sealing-work", "err", err)
return
}
timer.Reset(time.Second * time.Duration(c.period))
}
}
}
func RegisterSimulatedBeaconAPIs(stack *node.Node, sim *SimulatedBeacon) {
stack.RegisterAPIs([]rpc.API{
{
Namespace: "dev",
Service: &api{sim},
Version: "1.0",
},
})
}