func secretsFunc(b *Brain, used, missing *dep.Set) func(string) ([]string, error) {
	return func(s string) ([]string, error) {
		var result []string

		if len(s) == 0 {
			return result, nil
		}

		d, err := dep.NewVaultListQuery(s)
		if err != nil {
			return nil, err
		}

		used.Add(d)

		if value, ok := b.Recall(d); ok {
			result = value.([]string)
			return result, nil
		}

		missing.Add(d)

		return result, nil
	}
}
func secretsFunc(b *Brain, used, missing *dep.Set) func(string) ([]string, error) {
	return func(s string) ([]string, error) {
		var result []string

		if len(s) == 0 {
			return result, nil
		}

		d, err := dep.NewVaultListQuery(s)
		if err != nil {
			return nil, err
		}

		used.Add(d)

		if value, ok := b.Recall(d); ok {
			result = value.([]string)
			return result, nil
		}

		missing.Add(d)

		return result, nil
	}
}
// secretsFunc returns or accumulates a list of secret dependencies from Vault.