Support etcd

pkg/infrastructure/config/json/json.go

@@ -158,42 +158,14 @@ func (c *JSONConfigContainer) DefaultFloat(key string, defaultval float64) float
 }
 
 // String returns the string value for a given key.
-func (c *JSONConfigContainer) String(key string) string {
+func (c *JSONConfigContainer) String(key string) (string, error) {
 	val := c.getData(key)
 	if val != nil {
 		if v, ok := val.(string); ok {
-			return v
+			return v, nil
 		}
 	}
-	return ""
-}
-
-// DefaultString returns the string value for a given key.
-// if err != nil return defaultval
-func (c *JSONConfigContainer) DefaultString(key string, defaultval string) string {
-	// TODO FIXME should not use "" to replace non existence
-	if v := c.String(key); v != "" {
-		return v
-	}
-	return defaultval
-}
-
-// Strings returns the []string value for a given key.
-func (c *JSONConfigContainer) Strings(key string) []string {
-	stringVal := c.String(key)
-	if stringVal == "" {
-		return nil
-	}
-	return strings.Split(c.String(key), ";")
-}
-
-// DefaultStrings returns the []string value for a given key.
-// if err != nil return defaultval
-func (c *JSONConfigContainer) DefaultStrings(key string, defaultval []string) []string {
-	if v := c.Strings(key); v != nil {
-		return v
-	}
-	return defaultval
+	return "", errors.New(fmt.Sprintf("config not found or is not string, key: %s", key))
 }
 
 // GetSection returns map for the given section