按 userKey 获取用户信息

public Optional<CustomerUser> findByUserKey(String userKey) {
    R<GetUserByUserKeyResponse> r = customerUserClient.getUserByUserKey(userKey);
    if (r.isSuccess()) {
        return Optional.of(r.getData().getCustomerUser());
    }
    if (r.getCode() == FeignCodes.DataNotExist) {
        return Optional.empty();
    }
    throw new RuntimeException("查询用户信息出错");
}