Load chain config from a file

Makefile

@@ -25,3 +25,7 @@ integrationtest_local: | $(GINKGO) $(GOOSE)
 	go vet ./...
 	go fmt ./...
 	./scripts/run_integration_test.sh
+
+build:
+	go fmt ./...
+	GO111MODULE=on go build

cmd/state_validator.go

@@ -2,8 +2,11 @@ package cmd
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"os"
 
+	"github.com/ethereum/go-ethereum/params"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -34,10 +37,16 @@ func stateValidator() {
 	if height < 1 {
 		logWithCommand.Fatalf("block height cannot be less the 1")
 	}
-
 	trail := viper.GetUint64("validate.trail")
-	// TODO: add chain config logic here.
-	srvc := validator.NewService(cfg.DB, height, trail, nil)
+
+	chainConfigPath := viper.GetString("ethereum.chainConfig")
+	chainCfg, err := LoadConfig(chainConfigPath)
+	fmt.Println("chainCfg", chainCfg)
+	if err != nil {
+		logWithCommand.Fatal(err)
+	}
+
+	srvc := validator.NewService(cfg.DB, height, trail, chainCfg)
 
 	_, err = srvc.Start(context.Background())
 	if err != nil {
@@ -53,8 +62,12 @@ func init() {
 	stateValidatorCmd.PersistentFlags().String("block-height", "1", "block height to initiate state validation")
 	stateValidatorCmd.PersistentFlags().String("trail", "0", "trail of block height to validate")
 
+	stateValidatorCmd.PersistentFlags().String("chainConfig", "", "path to chain config")
+
 	_ = viper.BindPFlag("validate.block-height", stateValidatorCmd.PersistentFlags().Lookup("block-height"))
 	_ = viper.BindPFlag("validate.trail", stateValidatorCmd.PersistentFlags().Lookup("trail"))
+
+	_ = viper.BindPFlag("ethereum.chainConfig", stateValidatorCmd.PersistentFlags().Lookup("chainConfig"))
 }
 
 func initConfig() {
@@ -69,3 +82,25 @@ func initConfig() {
 		log.Warn("No config file passed with --config flag")
 	}
 }
+
+// LoadConfig loads chain config from json file
+func LoadConfig(chainConfigPath string) (*params.ChainConfig, error) {
+	file, err := os.Open(chainConfigPath)
+	if err != nil {
+		log.Error(fmt.Sprintf("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 {
+		log.Error(fmt.Sprintf("invalid chain config file: %v", err))
+
+		return nil, err
+	}
+
+	log.Info(fmt.Sprintf("Using chain config from %s file. Content %+v", chainConfigPath, chainConfig))
+
+	return chainConfig, nil
+}

environments/example.toml

@@ -8,3 +8,6 @@
 [validate]
     block-height = 1
     trail  = 10
+
+[ethereum]
+    chainConfig = "./chain.json"