Add ChainID function.

jsonrpc/chainid.go

@@ -0,0 +1,35 @@
+// 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"
+	"strconv"
+	"strings"
+)
+
+// ChainID returns the chain ID of the node.
+func (s *Service) ChainID(ctx context.Context) (uint64, error) {
+	version := ""
+	if err := s.client.CallFor(&version, "eth_chainId"); err != nil {
+		return 0, err
+	}
+
+	res, err := strconv.ParseUint(strings.TrimPrefix(version, "0x"), 10, 64)
+	if err != nil {
+		return 0, err
+	}
+
+	return res, nil
+}

jsonrpc/chainid_test.go

@@ -0,0 +1,41 @@
+// 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_test
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"testing"
+
+	execclient "github.com/attestantio/go-execution-client"
+	"github.com/attestantio/go-execution-client/jsonrpc"
+	"github.com/rs/zerolog"
+	"github.com/stretchr/testify/require"
+)
+
+func TestChainID(t *testing.T) {
+	ctx := context.Background()
+	s, err := jsonrpc.New(ctx,
+		jsonrpc.WithLogLevel(zerolog.Disabled),
+		jsonrpc.WithAddress(os.Getenv("JSONRPC_ADDRESS")),
+		jsonrpc.WithTimeout(timeout),
+	)
+	require.NoError(t, err)
+
+	id, err := s.(execclient.ChainIDProvider).ChainID(ctx)
+	require.NoError(t, err)
+	require.NotNil(t, id)
+	fmt.Printf("%d\n", id)
+}

service.go

@@ -56,6 +56,12 @@ type ChainHeightProvider interface {
 	ChainHeight(ctx context.Context) (uint32, error)
 }
 
+// ChainIDProvider is the interface for providing the chain ID.
+type ChainIDProvider interface {
+	// ChainID returns the chain ID.
+	ChainID(ctx context.Context) (uint64, error)
+}
+
 // EventsProvider is the interface for providing events.
 type EventsProvider interface {
 	// Events returns the events matching the filter.