feat: op-program supports custom chain config

op-program/Makefile

@@ -51,6 +51,9 @@ test:
 verify-sepolia: op-program-host op-program-client
 	env GO111MODULE=on go run ./verify/sepolia/cmd/sepolia.go --l1 $$SEPOLIA_L1URL --l1.beacon $$SEPOLIA_BEACON_URL --l2 $$SEPOLIA_L2URL --datadir /tmp/test-sepolia
 
+verify-devnet:
+	env GO111MODULE=on go run ./verify/devnet/cmd/devnet.go --l1 http://localhost:8545 --l1.beacon http://localhost:5052 --l2 http://localhost:9545 --datadir /tmp/test-devnet
+
 capture-mainnet-genesis: op-program-host op-program-client
 	rm -rf "$(COMPAT_DIR)/mainnet-genesis" "$(COMPAT_DIR)/mainnet-genesis.tar.bz"
 	env GO111MODULE=on go run ./verify/mainnet/cmd/mainnet.go --l1 $$MAINNET_L1URL --l1.beacon $$MAINNET_BEACON_URL --l2 $$MAINNET_L2URL --datadir "$(COMPAT_DIR)/mainnet-genesis" --l1.head "0x4903424f6cc2cfba7c2bf8c8f48ca46721c963fa64b411cfee3697b781e3e5f1" --l2.start "105235063" --l2.end "105235064"
@@ -97,6 +100,7 @@ verify-compat: verify-sepolia-delta verify-sepolia-ecotone verify-mainnet-genesi
 	test \
 	capture-goerli-verify \
 	verify-sepolia \
+	verify-devnet \
 	capture-mainnet-genesis \
 	capture-sepolia-delta \
 	capture-sepolia-ecotone \

op-program/chainconfig/chaincfg.go

@@ -1,10 +1,15 @@
 package chainconfig
 
 import (
+	"embed"
+	"encoding/json"
+	"errors"
 	"fmt"
+	"os"
 
 	"github.com/ethereum-optimism/optimism/op-node/chaincfg"
 	"github.com/ethereum-optimism/optimism/op-node/rollup"
+	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/params"
 )
 
@@ -13,16 +18,56 @@ func OPSepoliaChainConfig() *params.ChainConfig {
 	return mustLoadChainConfig("op-sepolia")
 }
 
+//go:embed configs/*json
+var customChainConfigFS embed.FS
+
 func RollupConfigByChainID(chainID uint64) (*rollup.Config, error) {
 	config, err := rollup.LoadOPStackRollupConfig(chainID)
-	if err != nil {
+	if err == nil {
+		return config, err
+	}
+	return rollupConfigByChainID(chainID, customChainConfigFS)
+}
+
+func rollupConfigByChainID(chainID uint64, customChainFS embed.FS) (*rollup.Config, error) {
+	// Load custom rollup configs from embed FS
+	file, err := customChainFS.Open(fmt.Sprintf("configs/%d-rollup.json", chainID))
+	if errors.Is(err, os.ErrNotExist) {
+		return nil, fmt.Errorf("no rollup config available for chain ID: %d", chainID)
+	} else if err != nil {
 		return nil, fmt.Errorf("failed to get rollup config for chain ID %d: %w", chainID, err)
 	}
-	return config, nil
+	dec := json.NewDecoder(file)
+	dec.DisallowUnknownFields()
+	var customRollupConfig rollup.Config
+	if err := dec.Decode(&customRollupConfig); err != nil {
+		return nil, fmt.Errorf("failed to parse rollup config for chain ID %d: %w", chainID, err)
+	}
+	return &customRollupConfig, nil
 }
 
 func ChainConfigByChainID(chainID uint64) (*params.ChainConfig, error) {
-	return params.LoadOPStackChainConfig(chainID)
+	config, err := params.LoadOPStackChainConfig(chainID)
+	if err == nil {
+		return config, err
+	}
+	return chainConfigByChainID(chainID, customChainConfigFS)
+}
+
+func chainConfigByChainID(chainID uint64, customChainFS embed.FS) (*params.ChainConfig, error) {
+	// Load from custom chain configs from embed FS
+	data, err := customChainFS.ReadFile(fmt.Sprintf("configs/%d-genesis-l2.json", chainID))
+	if errors.Is(err, os.ErrNotExist) {
+		return nil, fmt.Errorf("no chain config available for chain ID: %d", chainID)
+	} else if err != nil {
+		return nil, fmt.Errorf("failed to get chain config for chain ID %d: %w", chainID, err)
+	}
+	var genesis core.Genesis
+	err = json.Unmarshal(data, &genesis)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse chain config for chain ID %d: %w", chainID, err)
+	}
+	return genesis.Config, nil
 }
 
 func mustLoadChainConfig(name string) *params.ChainConfig {

op-program/chainconfig/chaincfg_test.go

@@ -0,0 +1,29 @@
+package chainconfig
+
+import (
+	"testing"
+
+	"github.com/ethereum-optimism/optimism/op-program/chainconfig/test"
+	"github.com/stretchr/testify/require"
+)
+
+// TestGetCustomRollupConfig tests loading the custom rollup configs from test embed FS.
+func TestGetCustomRollupConfig(t *testing.T) {
+	config, err := rollupConfigByChainID(901, test.TestCustomChainConfigFS)
+	require.NoError(t, err)
+	require.Equal(t, config.L1ChainID.Uint64(), uint64(900))
+	require.Equal(t, config.L2ChainID.Uint64(), uint64(901))
+
+	_, err = rollupConfigByChainID(900, test.TestCustomChainConfigFS)
+	require.Error(t, err)
+}
+
+// TestGetCustomChainConfig tests loading the custom chain configs from test embed FS.
+func TestGetCustomChainConfig(t *testing.T) {
+	config, err := chainConfigByChainID(901, test.TestCustomChainConfigFS)
+	require.NoError(t, err)
+	require.Equal(t, config.ChainID.Uint64(), uint64(901))
+
+	_, err = chainConfigByChainID(900, test.TestCustomChainConfigFS)
+	require.Error(t, err)
+}

op-program/chainconfig/configs/placeholder.json

@@ -0,0 +1 @@
+{}