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package fetch
import (
"context"
"encoding/json"
"fmt"
"log"
"math/big"
"os"
"path"
"sync/atomic"
"time"
"github.com/ethereum-optimism/optimism/op-node/rollup/derive"
"github.com/ethereum-optimism/optimism/op-service/eth"
"github.com/ethereum-optimism/optimism/op-service/sources"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethclient"
"golang.org/x/sync/errgroup"
)
type TransactionWithMetadata struct {
TxIndex uint64 `json:"tx_index"`
InboxAddr common.Address `json:"inbox_address"`
BlockNumber uint64 `json:"block_number"`
BlockHash common.Hash `json:"block_hash"`
BlockTime uint64 `json:"block_time"`
ChainId uint64 `json:"chain_id"`
Sender common.Address `json:"sender"`
ValidSender bool `json:"valid_sender"`
Frames []derive.Frame `json:"frames"`
FrameErrs []string `json:"frame_parse_error"`
ValidFrames []bool `json:"valid_data"`
Tx *types.Transaction `json:"tx"`
}
type Config struct {
Start, End uint64
ChainID *big.Int
BatchInbox common.Address
BatchSenders map[common.Address]struct{}
OutDirectory string
ConcurrentRequests uint64
}
// Batches fetches & stores all transactions sent to the batch inbox address in
// the given block range (inclusive to exclusive).
// The transactions & metadata are written to the out directory.
func Batches(client *ethclient.Client, beacon *sources.L1BeaconClient, config Config) (totalValid, totalInvalid uint64) {
if err := os.MkdirAll(config.OutDirectory, 0750); err != nil {
log.Fatal(err)
}
signer := types.LatestSignerForChainID(config.ChainID)
concurrentRequests := int(config.ConcurrentRequests)
g, ctx := errgroup.WithContext(context.Background())
g.SetLimit(concurrentRequests)
for i := config.Start; i < config.End; i++ {
if err := ctx.Err(); err != nil {
break
}
number := i
g.Go(func() error {
valid, invalid, err := fetchBatchesPerBlock(ctx, client, beacon, number, signer, config)
if err != nil {
return fmt.Errorf("error occurred while fetching block %d: %w", number, err)
}
atomic.AddUint64(&totalValid, valid)
atomic.AddUint64(&totalInvalid, invalid)
return nil
})
}
if err := g.Wait(); err != nil {
log.Fatal(err)
}
return
}
// fetchBatchesPerBlock gets a block & the parses all of the transactions in the block.
func fetchBatchesPerBlock(ctx context.Context, client *ethclient.Client, beacon *sources.L1BeaconClient, number uint64, signer types.Signer, config Config) (uint64, uint64, error) {
validBatchCount := uint64(0)
invalidBatchCount := uint64(0)
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel()
block, err := client.BlockByNumber(ctx, new(big.Int).SetUint64(number))
if err != nil {
return 0, 0, err
}
fmt.Println("Fetched block: ", number)
blobIndex := 0 // index of each blob in the block's blob sidecar
for i, tx := range block.Transactions() {
if tx.To() != nil && *tx.To() == config.BatchInbox {
sender, err := signer.Sender(tx)
if err != nil {
return 0, 0, err
}
validSender := true
if _, ok := config.BatchSenders[sender]; !ok {
fmt.Printf("Found a transaction (%s) from an invalid sender (%s)\n", tx.Hash().String(), sender.String())
invalidBatchCount += 1
validSender = false
}
var datas []hexutil.Bytes
if tx.Type() != types.BlobTxType {
datas = append(datas, tx.Data())
// no need to increment blobIndex because no blobs
} else {
if beacon == nil {
fmt.Printf("Unable to handle blob transaction (%s) because L1 Beacon API not provided\n", tx.Hash().String())
blobIndex += len(tx.BlobHashes())
continue
}
var hashes []eth.IndexedBlobHash
for _, h := range tx.BlobHashes() {
idh := eth.IndexedBlobHash{
Index: uint64(blobIndex),
Hash: h,
}
hashes = append(hashes, idh)
blobIndex += 1
}
blobs, err := beacon.GetBlobs(ctx, eth.L1BlockRef{
Hash: block.Hash(),
Number: block.Number().Uint64(),
ParentHash: block.ParentHash(),
Time: block.Time(),
}, hashes)
if err != nil {
log.Fatal(fmt.Errorf("failed to fetch blobs: %w", err))
}
for _, blob := range blobs {
data, err := blob.ToData()
if err != nil {
log.Fatal(fmt.Errorf("failed to parse blobs: %w", err))
}
datas = append(datas, data)
}
}
var frameErrors []string
var frames []derive.Frame
var validFrames []bool
validBatch := true
for _, data := range datas {
validFrame := true
frameError := ""
framesPerData, err := derive.ParseFrames(data)
if err != nil {
fmt.Printf("Found a transaction (%s) with invalid data: %v\n", tx.Hash().String(), err)
validFrame = false
validBatch = false
frameError = err.Error()
} else {
frames = append(frames, framesPerData...)
}
frameErrors = append(frameErrors, frameError)
validFrames = append(validFrames, validFrame)
}
if validSender && validBatch {
validBatchCount += 1
} else {
invalidBatchCount += 1
}
txm := &TransactionWithMetadata{
Tx: tx,
Sender: sender,
ValidSender: validSender,
TxIndex: uint64(i),
BlockNumber: block.NumberU64(),
BlockHash: block.Hash(),
BlockTime: block.Time(),
ChainId: config.ChainID.Uint64(),
InboxAddr: config.BatchInbox,
Frames: frames,
FrameErrs: frameErrors,
ValidFrames: validFrames,
}
filename := path.Join(config.OutDirectory, fmt.Sprintf("%s.json", tx.Hash().String()))
file, err := os.Create(filename)
if err != nil {
return 0, 0, err
}
enc := json.NewEncoder(file)
if err := enc.Encode(txm); err != nil {
file.Close()
return 0, 0, err
}
file.Close()
} else {
blobIndex += len(tx.BlobHashes())
}
}
return validBatchCount, invalidBatchCount, nil
}