feat: loader logic

pkg/storage/fs/fs.go

@@ -163,10 +163,10 @@ func (s *fsStorage) SaveOrderAsync(id client.GameID, turn uint, o order.Order, c
 	}()
 }
 
-func (s *fsStorage) FileExists(path string) (bool, error) {
+func (s *fsStorage) FileExists(path string) (bool, string, error) {
 	absPath, err := s.resolvePath(path)
 	if err != nil {
-		return false, err
+		return false, "", err
 	}
 
 	var exists bool
@@ -175,7 +175,13 @@ func (s *fsStorage) FileExists(path string) (bool, error) {
 		exists, opErr = s.fileExistsUnlocked(absPath)
 		return opErr
 	})
-	return exists, err
+	if err != nil {
+		return false, "", err
+	}
+	if !exists {
+		return false, "", nil
+	}
+	return true, absPath, nil
 }
 
 func (s *fsStorage) ReadFile(path string) ([]byte, error) {
@@ -254,7 +260,8 @@ func (s *fsStorage) ListFiles() ([]string, error) {
 }
 
 func (s *fsStorage) StateExists() (bool, error) {
-	return s.FileExists(stateFileName)
+	exists, _, err := s.FileExists(stateFileName)
+	return exists, err
 }
 
 func (s *fsStorage) LoadState() (client.State, error) {