Add transaction in block method.

jsonrpc/transactioninblock.go

@@ -0,0 +1,37 @@
+// Copyright © 2022 Attestant Limited.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jsonrpc
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/attestantio/go-execution-client/spec"
+	"github.com/attestantio/go-execution-client/types"
+	"github.com/pkg/errors"
+)
+
+// TransactionInBlock returns the transaction for the given transaction in a block at the given index.
+func (s *Service) TransactionInBlock(ctx context.Context, blockHash types.Hash, index uint32) (*spec.Transaction, error) {
+	if len(blockHash) == 0 {
+		return nil, errors.New("hash nil")
+	}
+
+	var transaction spec.Transaction
+	if err := s.client.CallFor(&transaction, "eth_getTransactionByBlockHashAndIndex", fmt.Sprintf("%#x", blockHash), fmt.Sprintf("%#x", index)); err != nil {
+		return nil, err
+	}
+
+	return &transaction, nil
+}

service.go

@@ -96,6 +96,9 @@ type SyncingProvider interface {
 type TransactionsProvider interface {
 	// Transaction returns the transaction for the given transaction hash.
 	Transaction(ctx context.Context, hash types.Hash) (*spec.Transaction, error)
+
+	// TransactionInBlock returns the transaction for the given transaction in a block at the given index.
+	TransactionInBlock(ctx context.Context, blockHash types.Hash, index uint32) (*spec.Transaction, error)
 }
 
 // TransactionReceiptsProvider is the interface for providing transaction receipts.