func checkSDFile()

in collector/receiver/prometheusreceiver/config.go [133:160]

• 25 lines of code
• 8 McCabe index (conditional complexity)

func checkSDFile(filename string) error {
	content, err := os.ReadFile(filepath.Clean(filename))
	if err != nil {
		return err
	}

	var targetGroups []*targetgroup.Group

	switch ext := filepath.Ext(filename); strings.ToLower(ext) {
	case ".json":
		if err := json.Unmarshal(content, &targetGroups); err != nil {
			return fmt.Errorf("error in unmarshaling json file extension: %w", err)
		}
	case ".yml", ".yaml":
		if err := yaml.UnmarshalStrict(content, &targetGroups); err != nil {
			return fmt.Errorf("error in unmarshaling yaml file extension: %w", err)
		}
	default:
		return fmt.Errorf("invalid file extension: %q", ext)
	}

	for i, tg := range targetGroups {
		if tg == nil {
			return fmt.Errorf("nil target group item found (index %d)", i)
		}
	}
	return nil
}