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package derive
import (
"context"
"errors"
"fmt"
"io"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum-optimism/optimism/op-node/eth"
"github.com/ethereum-optimism/optimism/op-node/rollup"
)
type DataIter interface {
Next(ctx context.Context) (eth.Data, error)
}
type L1TransactionFetcher interface {
InfoAndTxsByHash(ctx context.Context, hash common.Hash) (eth.BlockInfo, types.Transactions, error)
}
// DataSourceFactory readers raw transactions from a given block & then filters for
// batch submitter transactions.
// This is not a stage in the pipeline, but a wrapper for another stage in the pipeline
type DataSourceFactory struct {
log log.Logger
cfg *rollup.Config
fetcher L1TransactionFetcher
}
func NewDataSourceFactory(log log.Logger, cfg *rollup.Config, fetcher L1TransactionFetcher) *DataSourceFactory {
return &DataSourceFactory{log: log, cfg: cfg, fetcher: fetcher}
}
// OpenData returns a CalldataSourceImpl. This struct implements the `Next` function.
func (ds *DataSourceFactory) OpenData(ctx context.Context, id eth.BlockID, batcherAddr common.Address) DataIter {
return NewDataSource(ctx, ds.log, ds.cfg, ds.fetcher, id, batcherAddr)
}
// DataSource is a fault tolerant approach to fetching data.
// The constructor will never fail & it will instead re-attempt the fetcher
// at a later point.
type DataSource struct {
// Internal state + data
open bool
data []eth.Data
// Required to re-attempt fetching
id eth.BlockID
cfg *rollup.Config // TODO: `DataFromEVMTransactions` should probably not take the full config
fetcher L1TransactionFetcher
log log.Logger
batcherAddr common.Address
}
// NewDataSource creates a new calldata source. It suppresses errors in fetching the L1 block if they occur.
// If there is an error, it will attempt to fetch the result on the next call to `Next`.
func NewDataSource(ctx context.Context, log log.Logger, cfg *rollup.Config, fetcher L1TransactionFetcher, block eth.BlockID, batcherAddr common.Address) DataIter {
_, txs, err := fetcher.InfoAndTxsByHash(ctx, block.Hash)
if err != nil {
return &DataSource{
open: false,
id: block,
cfg: cfg,
fetcher: fetcher,
log: log,
batcherAddr: batcherAddr,
}
} else {
return &DataSource{
open: true,
data: DataFromEVMTransactions(cfg, batcherAddr, txs, log.New("origin", block)),
}
}
}
// Next returns the next piece of data if it has it. If the constructor failed, this
// will attempt to reinitialize itself. If it cannot find the block it returns a ResetError
// otherwise it returns a temporary error if fetching the block returns an error.
func (ds *DataSource) Next(ctx context.Context) (eth.Data, error) {
if !ds.open {
if _, txs, err := ds.fetcher.InfoAndTxsByHash(ctx, ds.id.Hash); err == nil {
ds.open = true
ds.data = DataFromEVMTransactions(ds.cfg, ds.batcherAddr, txs, log.New("origin", ds.id))
} else if errors.Is(err, ethereum.NotFound) {
return nil, NewResetError(fmt.Errorf("failed to open calldata source: %w", err))
} else {
return nil, NewTemporaryError(fmt.Errorf("failed to open calldata source: %w", err))
}
}
if len(ds.data) == 0 {
return nil, io.EOF
} else {
data := ds.data[0]
ds.data = ds.data[1:]
return data, nil
}
}
// DataFromEVMTransactions filters all of the transactions and returns the calldata from transactions
// that are sent to the batch inbox address from the batch sender address.
// This will return an empty array if no valid transactions are found.
func DataFromEVMTransactions(config *rollup.Config, batcherAddr common.Address, txs types.Transactions, log log.Logger) []eth.Data {
var out []eth.Data
l1Signer := config.L1Signer()
for j, tx := range txs {
if to := tx.To(); to != nil && *to == config.BatchInboxAddress {
seqDataSubmitter, err := l1Signer.Sender(tx) // optimization: only derive sender if To is correct
if err != nil {
log.Warn("tx in inbox with invalid signature", "index", j, "err", err)
continue // bad signature, ignore
}
// some random L1 user might have sent a transaction to our batch inbox, ignore them
if seqDataSubmitter != batcherAddr {
log.Warn("tx in inbox with unauthorized submitter", "index", j, "err", err)
continue // not an authorized batch submitter, ignore
}
out = append(out, tx.Data())
}
}
return out
}