cmd/serve.go

@@ -137,6 +137,7 @@ func init() {
 	serveCmd.PersistentFlags().String("eth-chain-id", "1", "eth chain id")
 	serveCmd.PersistentFlags().String("eth-default-sender", "", "default sender address")
 	serveCmd.PersistentFlags().String("eth-rpc-gas-cap", "", "rpc gas cap (for eth_Call execution)")
+	serveCmd.PersistentFlags().String("eth-chain-config", "", "json chain config file location")
 
 	// and their bindings
 	viper.BindPFlag("server.graphql", serveCmd.PersistentFlags().Lookup("server-graphql"))
@@ -153,4 +154,5 @@ func init() {
 	viper.BindPFlag("ethereum.chainID", serveCmd.PersistentFlags().Lookup("eth-chain-id"))
 	viper.BindPFlag("ethereum.defaultSender", serveCmd.PersistentFlags().Lookup("eth-default-sender"))
 	viper.BindPFlag("ethereum.rpcGasCap", serveCmd.PersistentFlags().Lookup("eth-rpc-gas-cap"))
+	viper.BindPFlag("ethereum.chainConfig", serveCmd.PersistentFlags().Lookup("eth-chain-config"))
 }

pkg/eth/helpers.go

@@ -17,7 +17,11 @@
 package eth
 
 import (
+	"encoding/json"
 	"fmt"
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	log "github.com/sirupsen/logrus"
+	"os"
 
 	sdtypes "github.com/ethereum/go-ethereum/statediff/types"
 
@@ -40,7 +44,28 @@ func ResolveToNodeType(nodeType int) sdtypes.NodeType {
 }
 
 // ChainConfig returns the appropriate ethereum chain config for the provided chain id
-func ChainConfig(chainID uint64) (*params.ChainConfig, error) {
+func ChainConfig(chainID uint64, chainConfigPath string) (*params.ChainConfig, error) {
+	if chainConfigPath != "" {
+		file, err := os.Open(chainConfigPath)
+		if err != nil {
+			utils.Fatalf("Failed to read chain config file: %v", err)
+
+			return nil, err
+		}
+		defer file.Close()
+
+		chainConfig := new(params.ChainConfig)
+		if err := json.NewDecoder(file).Decode(chainConfig); err != nil {
+			utils.Fatalf("invalid chain config file: %v", err)
+
+			return nil, err
+		}
+
+		log.Infof("Using chain config from %s file. Content %+v", chainConfigPath, chainConfig)
+
+		return chainConfig, nil
+	}
+
 	switch chainID {
 	case 1:
 		return params.MainnetChainConfig, nil

pkg/serve/config.go

@@ -48,6 +48,7 @@ const (
 
 	ETH_DEFAULT_SENDER_ADDR = "ETH_DEFAULT_SENDER_ADDR"
 	ETH_RPC_GAS_CAP         = "ETH_RPC_GAS_CAP"
+	ETH_CHAIN_CONFIG        = "ETH_CHAIN_CONFIG"
 	ETH_SUPPORTS_STATEDIFF  = "ETH_SUPPORTS_STATEDIFF"
 )
 
@@ -76,6 +77,7 @@ func NewConfig() (*Config, error) {
 	viper.BindEnv("ethereum.httpPath", shared.ETH_HTTP_PATH)
 	viper.BindEnv("ethereum.defaultSender", ETH_DEFAULT_SENDER_ADDR)
 	viper.BindEnv("ethereum.rpcGasCap", ETH_RPC_GAS_CAP)
+	viper.BindEnv("ethereum.chainConfig", ETH_CHAIN_CONFIG)
 	viper.BindEnv("ethereum.supportsStateDiff", ETH_SUPPORTS_STATEDIFF)
 
 	c.DBConfig.Init()
@@ -123,7 +125,7 @@ func NewConfig() (*Config, error) {
 			c.RPCGasCap = rpcGasCap
 		}
 	}
-	c.ChainConfig, err = eth.ChainConfig(nodeInfo.ChainID)
+	c.ChainConfig, err = eth.ChainConfig(nodeInfo.ChainID, viper.GetString("ethereum.chainConfig"))
 	return c, err
 }