EchoServer::EchoServer(uint16_t port) : acceptor_() {
    std::cout << "start echo" << std::endl;
  tinyfiber::Status st = acceptor_.Listen(port);
    std::cout << "listen is OK" << std::endl;
}

void EchoServer::ServeForever() {
    std::cout << "serve" << std::endl;
    tinyfiber::tcp::Socket socket = acceptor_.Accept();
    std::cout << "accepted" << std::endl;
    std::string message = ReadAll(socket);
    socket.Write(asio::buffer(message)).ExpectOk();
}