feat: deserialize L2 TxMeta in ethclient

l2geth/core/types/transaction_meta.go

@@ -7,6 +7,7 @@ package types
 import (
 	"bytes"
 	"encoding/binary"
+	"fmt"
 	"math/big"
 
 	"github.com/ethereum-optimism/optimism/l2geth/common"
@@ -31,6 +32,19 @@ func (q QueueOrigin) String() string {
 	}
 }
 
+func (q *QueueOrigin) UnmarshalJSON(b []byte) error {
+	switch string(b) {
+	case "\"sequencer\"":
+		*q = QueueOriginSequencer
+		return nil
+	case "\"l1\"":
+		*q = QueueOriginL1ToL2
+		return nil
+	default:
+		return fmt.Errorf("Unknown QueueOrigin: %q", b)
+	}
+}
+
 //go:generate gencodec -type TransactionMeta -out gen_tx_meta_json.go
 
 type TransactionMeta struct {

l2geth/ethclient/ethclient.go

@@ -154,6 +154,13 @@ func (ec *Client) getBlock(ctx context.Context, method string, args ...interface
 		if tx.From != nil {
 			setSenderFromServer(tx.tx, *tx.From, body.Hash)
 		}
+		meta := types.NewTransactionMeta(
+			tx.meta.L1BlockNumber, tx.meta.L1Timestamp,
+			tx.meta.L1MessageSender, tx.meta.QueueOrigin,
+			tx.meta.Index, tx.meta.QueueIndex,
+			tx.meta.RawTransaction,
+		)
+		tx.tx.SetTransactionMeta(meta)
 		txs[i] = tx.tx
 	}
 	return types.NewBlockWithHeader(head).WithBody(txs, uncles), nil
@@ -181,10 +188,31 @@ func (ec *Client) HeaderByNumber(ctx context.Context, number *big.Int) (*types.H
 }
 
 type rpcTransaction struct {
-	tx *types.Transaction
+	tx   *types.Transaction
+	meta *rpcTransactionMeta
 	txExtraInfo
 }
 
+//go:generate gencodec -type rpcTransactionMeta -field-override rpcTransactionMetaMarshaling -out gen_rpc_tx_meta_json.go
+
+type rpcTransactionMeta struct {
+	L1BlockNumber   *big.Int          `json:"l1BlockNumber"`
+	L1Timestamp     uint64            `json:"l1Timestamp"`
+	L1MessageSender *common.Address   `json:"l1MessageSender"`
+	QueueOrigin     types.QueueOrigin `json:"queueOrigin"`
+	Index           *uint64           `json:"index"`
+	QueueIndex      *uint64           `json:"queueIndex"`
+	RawTransaction  []byte            `json:"rawTransaction"`
+}
+
+type rpcTransactionMetaMarshaling struct {
+	L1BlockNumber  *hexutil.Big
+	L1Timestamp    hexutil.Uint64
+	Index          *hexutil.Uint64
+	QueueIndex     *hexutil.Uint64
+	RawTransaction hexutil.Bytes
+}
+
 type txExtraInfo struct {
 	BlockNumber *string         `json:"blockNumber,omitempty"`
 	BlockHash   *common.Hash    `json:"blockHash,omitempty"`
@@ -195,6 +223,9 @@ func (tx *rpcTransaction) UnmarshalJSON(msg []byte) error {
 	if err := json.Unmarshal(msg, &tx.tx); err != nil {
 		return err
 	}
+	if err := json.Unmarshal(msg, &tx.meta); err != nil {
+		return err
+	}
 	return json.Unmarshal(msg, &tx.txExtraInfo)
 }