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l2_output_submitter.go
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l2_output_submitter.go
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package proposer
import (
"context"
"errors"
"fmt"
"math/big"
_ "net/http/pprof"
"sync"
"time"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/urfave/cli/v2"
"github.com/ethereum-optimism/optimism/op-bindings/bindings"
"github.com/ethereum-optimism/optimism/op-node/eth"
"github.com/ethereum-optimism/optimism/op-node/sources"
"github.com/ethereum-optimism/optimism/op-proposer/flags"
"github.com/ethereum-optimism/optimism/op-proposer/metrics"
opservice "github.com/ethereum-optimism/optimism/op-service"
opclient "github.com/ethereum-optimism/optimism/op-service/client"
oplog "github.com/ethereum-optimism/optimism/op-service/log"
"github.com/ethereum-optimism/optimism/op-service/opio"
oppprof "github.com/ethereum-optimism/optimism/op-service/pprof"
oprpc "github.com/ethereum-optimism/optimism/op-service/rpc"
"github.com/ethereum-optimism/optimism/op-service/txmgr"
)
var supportedL2OutputVersion = eth.Bytes32{}
// Main is the entrypoint into the L2 Output Submitter. This method executes the
// service and blocks until the service exits.
func Main(version string, cliCtx *cli.Context) error {
if err := flags.CheckRequired(cliCtx); err != nil {
return err
}
cfg := NewConfig(cliCtx)
if err := cfg.Check(); err != nil {
return fmt.Errorf("invalid CLI flags: %w", err)
}
l := oplog.NewLogger(cfg.LogConfig)
opservice.ValidateEnvVars(flags.EnvVarPrefix, flags.Flags, l)
m := metrics.NewMetrics("default")
l.Info("Initializing L2 Output Submitter")
proposerConfig, err := NewL2OutputSubmitterConfigFromCLIConfig(cfg, l, m)
if err != nil {
l.Error("Unable to create the L2 Output Submitter", "error", err)
return err
}
l2OutputSubmitter, err := NewL2OutputSubmitter(*proposerConfig, l, m)
if err != nil {
l.Error("Unable to create the L2 Output Submitter", "error", err)
return err
}
l.Info("Starting L2 Output Submitter")
ctx, cancel := context.WithCancel(context.Background())
if err := l2OutputSubmitter.Start(); err != nil {
cancel()
l.Error("Unable to start L2 Output Submitter", "error", err)
return err
}
defer l2OutputSubmitter.Stop()
l.Info("L2 Output Submitter started")
pprofConfig := cfg.PprofConfig
if pprofConfig.Enabled {
l.Info("starting pprof", "addr", pprofConfig.ListenAddr, "port", pprofConfig.ListenPort)
go func() {
if err := oppprof.ListenAndServe(ctx, pprofConfig.ListenAddr, pprofConfig.ListenPort); err != nil {
l.Error("error starting pprof", "err", err)
}
}()
}
metricsCfg := cfg.MetricsConfig
if metricsCfg.Enabled {
l.Info("starting metrics server", "addr", metricsCfg.ListenAddr, "port", metricsCfg.ListenPort)
go func() {
if err := m.Serve(ctx, metricsCfg.ListenAddr, metricsCfg.ListenPort); err != nil {
l.Error("error starting metrics server", err)
}
}()
m.StartBalanceMetrics(ctx, l, proposerConfig.L1Client, proposerConfig.TxManager.From())
}
rpcCfg := cfg.RPCConfig
server := oprpc.NewServer(rpcCfg.ListenAddr, rpcCfg.ListenPort, version, oprpc.WithLogger(l))
if err := server.Start(); err != nil {
cancel()
return fmt.Errorf("error starting RPC server: %w", err)
}
m.RecordInfo(version)
m.RecordUp()
opio.BlockOnInterrupts()
cancel()
return nil
}
// L2OutputSubmitter is responsible for proposing outputs
type L2OutputSubmitter struct {
txMgr txmgr.TxManager
wg sync.WaitGroup
done chan struct{}
log log.Logger
metr metrics.Metricer
ctx context.Context
cancel context.CancelFunc
// RollupClient is used to retrieve output roots from
rollupClient *sources.RollupClient
l2ooContract *bindings.L2OutputOracleCaller
l2ooContractAddr common.Address
l2ooABI *abi.ABI
// AllowNonFinalized enables the proposal of safe, but non-finalized L2 blocks.
// The L1 block-hash embedded in the proposal TX is checked and should ensure the proposal
// is never valid on an alternative L1 chain that would produce different L2 data.
// This option is not necessary when higher proposal latency is acceptable and L1 is healthy.
allowNonFinalized bool
// How frequently to poll L2 for new finalized outputs
pollInterval time.Duration
networkTimeout time.Duration
}
// NewL2OutputSubmitterFromCLIConfig creates a new L2 Output Submitter given the CLI Config
func NewL2OutputSubmitterFromCLIConfig(cfg CLIConfig, l log.Logger, m metrics.Metricer) (*L2OutputSubmitter, error) {
proposerConfig, err := NewL2OutputSubmitterConfigFromCLIConfig(cfg, l, m)
if err != nil {
return nil, err
}
return NewL2OutputSubmitter(*proposerConfig, l, m)
}
// NewL2OutputSubmitterConfigFromCLIConfig creates the proposer config from the CLI config.
func NewL2OutputSubmitterConfigFromCLIConfig(cfg CLIConfig, l log.Logger, m metrics.Metricer) (*Config, error) {
l2ooAddress, err := opservice.ParseAddress(cfg.L2OOAddress)
if err != nil {
return nil, err
}
txManager, err := txmgr.NewSimpleTxManager("proposer", l, m, cfg.TxMgrConfig)
if err != nil {
return nil, err
}
// Connect to L1 and L2 providers. Perform these last since they are the most expensive.
ctx := context.Background()
l1Client, err := opclient.DialEthClientWithTimeout(ctx, cfg.L1EthRpc, opclient.DefaultDialTimeout)
if err != nil {
return nil, err
}
rollupClient, err := opclient.DialRollupClientWithTimeout(ctx, cfg.RollupRpc, opclient.DefaultDialTimeout)
if err != nil {
return nil, err
}
return &Config{
L2OutputOracleAddr: l2ooAddress,
PollInterval: cfg.PollInterval,
NetworkTimeout: cfg.TxMgrConfig.NetworkTimeout,
L1Client: l1Client,
RollupClient: rollupClient,
AllowNonFinalized: cfg.AllowNonFinalized,
TxManager: txManager,
}, nil
}
// NewL2OutputSubmitter creates a new L2 Output Submitter
func NewL2OutputSubmitter(cfg Config, l log.Logger, m metrics.Metricer) (*L2OutputSubmitter, error) {
ctx, cancel := context.WithCancel(context.Background())
l2ooContract, err := bindings.NewL2OutputOracleCaller(cfg.L2OutputOracleAddr, cfg.L1Client)
if err != nil {
cancel()
return nil, fmt.Errorf("failed to create L2OO at address %s: %w", cfg.L2OutputOracleAddr, err)
}
cCtx, cCancel := context.WithTimeout(ctx, cfg.NetworkTimeout)
defer cCancel()
version, err := l2ooContract.Version(&bind.CallOpts{Context: cCtx})
if err != nil {
cancel()
return nil, err
}
log.Info("Connected to L2OutputOracle", "address", cfg.L2OutputOracleAddr, "version", version)
parsed, err := bindings.L2OutputOracleMetaData.GetAbi()
if err != nil {
cancel()
return nil, err
}
return &L2OutputSubmitter{
txMgr: cfg.TxManager,
done: make(chan struct{}),
log: l,
ctx: ctx,
cancel: cancel,
metr: m,
rollupClient: cfg.RollupClient,
l2ooContract: l2ooContract,
l2ooContractAddr: cfg.L2OutputOracleAddr,
l2ooABI: parsed,
allowNonFinalized: cfg.AllowNonFinalized,
pollInterval: cfg.PollInterval,
networkTimeout: cfg.NetworkTimeout,
}, nil
}
func (l *L2OutputSubmitter) Start() error {
l.wg.Add(1)
go l.loop()
return nil
}
func (l *L2OutputSubmitter) Stop() {
l.cancel()
close(l.done)
l.wg.Wait()
}
// FetchNextOutputInfo gets the block number of the next proposal.
// It returns: the next block number, if the proposal should be made, error
func (l *L2OutputSubmitter) FetchNextOutputInfo(ctx context.Context) (*eth.OutputResponse, bool, error) {
cCtx, cancel := context.WithTimeout(ctx, l.networkTimeout)
defer cancel()
callOpts := &bind.CallOpts{
From: l.txMgr.From(),
Context: cCtx,
}
nextCheckpointBlock, err := l.l2ooContract.NextBlockNumber(callOpts)
if err != nil {
l.log.Error("proposer unable to get next block number", "err", err)
return nil, false, err
}
// Fetch the current L2 heads
cCtx, cancel = context.WithTimeout(ctx, l.networkTimeout)
defer cancel()
status, err := l.rollupClient.SyncStatus(cCtx)
if err != nil {
l.log.Error("proposer unable to get sync status", "err", err)
return nil, false, err
}
// Use either the finalized or safe head depending on the config. Finalized head is default & safer.
var currentBlockNumber *big.Int
if l.allowNonFinalized {
currentBlockNumber = new(big.Int).SetUint64(status.SafeL2.Number)
} else {
currentBlockNumber = new(big.Int).SetUint64(status.FinalizedL2.Number)
}
// Ensure that we do not submit a block in the future
if currentBlockNumber.Cmp(nextCheckpointBlock) < 0 {
l.log.Info("proposer submission interval has not elapsed", "currentBlockNumber", currentBlockNumber, "nextBlockNumber", nextCheckpointBlock)
return nil, false, nil
}
return l.fetchOuput(ctx, nextCheckpointBlock)
}
func (l *L2OutputSubmitter) fetchOuput(ctx context.Context, block *big.Int) (*eth.OutputResponse, bool, error) {
ctx, cancel := context.WithTimeout(ctx, l.networkTimeout)
defer cancel()
output, err := l.rollupClient.OutputAtBlock(ctx, block.Uint64())
if err != nil {
l.log.Error("failed to fetch output at block %d: %w", block, err)
return nil, false, err
}
if output.Version != supportedL2OutputVersion {
l.log.Error("unsupported l2 output version: %s", output.Version)
return nil, false, errors.New("unsupported l2 output version")
}
if output.BlockRef.Number != block.Uint64() { // sanity check, e.g. in case of bad RPC caching
l.log.Error("invalid blockNumber: next blockNumber is %v, blockNumber of block is %v", block, output.BlockRef.Number)
return nil, false, errors.New("invalid blockNumber")
}
// Always propose if it's part of the Finalized L2 chain. Or if allowed, if it's part of the safe L2 chain.
if !(output.BlockRef.Number <= output.Status.FinalizedL2.Number || (l.allowNonFinalized && output.BlockRef.Number <= output.Status.SafeL2.Number)) {
l.log.Debug("not proposing yet, L2 block is not ready for proposal",
"l2_proposal", output.BlockRef,
"l2_safe", output.Status.SafeL2,
"l2_finalized", output.Status.FinalizedL2,
"allow_non_finalized", l.allowNonFinalized)
return nil, false, nil
}
return output, true, nil
}
// ProposeL2OutputTxData creates the transaction data for the ProposeL2Output function
func (l *L2OutputSubmitter) ProposeL2OutputTxData(output *eth.OutputResponse) ([]byte, error) {
return proposeL2OutputTxData(l.l2ooABI, output)
}
// proposeL2OutputTxData creates the transaction data for the ProposeL2Output function
func proposeL2OutputTxData(abi *abi.ABI, output *eth.OutputResponse) ([]byte, error) {
return abi.Pack(
"proposeL2Output",
output.OutputRoot,
new(big.Int).SetUint64(output.BlockRef.Number),
output.Status.CurrentL1.Hash,
new(big.Int).SetUint64(output.Status.CurrentL1.Number))
}
// sendTransaction creates & sends transactions through the underlying transaction manager.
func (l *L2OutputSubmitter) sendTransaction(ctx context.Context, output *eth.OutputResponse) error {
data, err := l.ProposeL2OutputTxData(output)
if err != nil {
return err
}
receipt, err := l.txMgr.Send(ctx, txmgr.TxCandidate{
TxData: data,
To: &l.l2ooContractAddr,
GasLimit: 0,
})
if err != nil {
return err
}
if receipt.Status == types.ReceiptStatusFailed {
l.log.Error("proposer tx successfully published but reverted", "tx_hash", receipt.TxHash)
} else {
l.log.Info("proposer tx successfully published", "tx_hash", receipt.TxHash)
}
return nil
}
// loop is responsible for creating & submitting the next outputs
func (l *L2OutputSubmitter) loop() {
defer l.wg.Done()
ctx := l.ctx
ticker := time.NewTicker(l.pollInterval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
output, shouldPropose, err := l.FetchNextOutputInfo(ctx)
if err != nil {
break
}
if !shouldPropose {
break
}
cCtx, cancel := context.WithTimeout(ctx, 10*time.Minute)
if err := l.sendTransaction(cCtx, output); err != nil {
l.log.Error("Failed to send proposal transaction", "err", err)
cancel()
break
}
l.metr.RecordL2BlocksProposed(output.BlockRef)
cancel()
case <-l.done:
return
}
}
}