refactor: storage interface

client/storage/storage.go

@@ -1,9 +1,7 @@
 package storage
 
 import (
-	"errors"
 	"fmt"
-	"galaxy/util"
 	"path/filepath"
 )
 
@@ -15,26 +13,6 @@ const (
 	gameDataFileSuffix = ".dat"
 )
 
-type storage struct {
-	root string
-}
-
-// NewStorage returns implementation of the "galaxy/client.Storage" interface
-// or nil with a non-nil error when filesystem storage initialisation failed.
-func NewStorage(rootPath string) (*storage, error) {
-	ok, err := util.Writable(rootPath)
-	if err != nil {
-		return nil, err
-	}
-	if !ok {
-		return nil, errors.New("user does not have write permissions to the storage root")
-	}
-	s := &storage{
-		root: rootPath,
-	}
-	return s, nil
-}
-
 // StateFilePath returns client's state file path relative to the root,
 // file name and extension are pre-defined constant.
 func StateFilePath(root string) string {