Clean up and util methods

ethutil/bytes.go

@@ -98,6 +98,7 @@ func Bytes2Hex(d []byte) string {
 
 func Hex2Bytes(str string) []byte {
 	h, _ := hex.DecodeString(str)
+
 	return h
 }
 

ethutil/config.go

@@ -3,8 +3,9 @@ package ethutil
 import (
 	"flag"
 	"fmt"
-	"github.com/rakyll/globalconf"
 	"os"
+
+	"github.com/rakyll/globalconf"
 )
 
 // Config struct
@@ -28,8 +29,7 @@ var Config *ConfigManager
 func ReadConfig(ConfigFile string, Datadir string, EnvPrefix string) *ConfigManager {
 	if Config == nil {
 		// create ConfigFile if does not exist, otherwise globalconf panic when trying to persist flags
-		_, err := os.Stat(ConfigFile)
-		if err != nil && os.IsNotExist(err) {
+		if !FileExist(ConfigFile) {
 			fmt.Printf("config file '%s' doesn't exist, creating it\n", ConfigFile)
 			os.Create(ConfigFile)
 		}

ethutil/path.go

@@ -1,6 +1,8 @@
 package ethutil
 
 import (
+	"io/ioutil"
+	"os"
 	"os/user"
 	"strings"
 )
@@ -18,3 +20,41 @@ func ExpandHomePath(p string) (path string) {
 
 	return
 }
+
+func FileExist(filePath string) bool {
+	_, err := os.Stat(filePath)
+	if err != nil && os.IsNotExist(err) {
+		return false
+	}
+
+	return true
+}
+
+func ReadAllFile(filePath string) (string, error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return "", err
+	}
+
+	data, err := ioutil.ReadAll(file)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}
+
+func WriteFile(filePath string, content []byte) error {
+	fh, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE, os.ModePerm)
+	if err != nil {
+		return err
+	}
+	defer fh.Close()
+
+	_, err = fh.Write(content)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}