refactor: move redis to its own file and add in defaults

config/cluster.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"errors"
 	"reflect"
 
 	"github.com/mitchellh/mapstructure"
@@ -13,19 +12,6 @@ type ClusterConfig struct {
 	Etcd    *EtcdConfig  `mapstructure:"etcd"`
 }
 
-type RedisConfig struct {
-	Address  string `mapstructure:"address"`
-	Password string `mapstructure:"password"`
-	DB       int    `mapstructure:"db"`
-}
-
-func (r *RedisConfig) Validate() error {
-	if r.Address == "" {
-		return errors.New("address is required")
-	}
-	return nil
-}
-
 func clusterConfigHook() mapstructure.DecodeHookFuncType {
 	return func(f reflect.Type, t reflect.Type, data interface{}) (interface{}, error) {
 		if f.Kind() != reflect.Map || t != reflect.TypeOf(&ClusterConfig{}) {

config/redis.go

@@ -0,0 +1,26 @@
+package config
+
+import "errors"
+
+var _ Validator = (*RedisConfig)(nil)
+var _ Defaults = (*RedisConfig)(nil)
+
+type RedisConfig struct {
+	Address  string `mapstructure:"address"`
+	Password string `mapstructure:"password"`
+	DB       int    `mapstructure:"db"`
+}
+
+func (r *RedisConfig) Defaults() map[string]interface{} {
+	return map[string]interface{}{
+		"address": "localhost:6379",
+		"db":      0,
+	}
+}
+
+func (r *RedisConfig) Validate() error {
+	if r.Address == "" {
+		return errors.New("address is required")
+	}
+	return nil
+}