#include <ctime>
#include <iostream>
#include <string>
#include <boost/bind/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <asio.hpp>
using asio::ip::tcp;
std::string make_daytime_string()
{
using namespace std;
time_t now = time(0);
return ctime(&now);
}
class tcp_connection
: public boost::enable_shared_from_this<tcp_connection>
{
public:
typedef boost::shared_ptr<tcp_connection> pointer;
static pointer create(asio::io_context& io_context)
{
return pointer(new tcp_connection(io_context));
}
tcp::socket& socket()
{
return socket_;
}
void start()
{
message_ = make_daytime_string();
asio::async_write(socket_, asio::buffer(message_),
boost::bind(&tcp_connection::handle_write, shared_from_this(),
asio::placeholders::error,
asio::placeholders::bytes_transferred));
}
private:
tcp_connection(asio::io_context& io_context)
: socket_(io_context)
{
}
void handle_write(const asio::error_code& ,
size_t )
{
}
tcp::socket socket_;
std::string message_;
};
class tcp_server
{
public:
tcp_server(asio::io_context& io_context)
: io_context_(io_context),
acceptor_(io_context, tcp::endpoint(tcp::v4(), 13))
{
start_accept();
}
private:
void start_accept()
{
tcp_connection::pointer new_connection =
tcp_connection::create(io_context_);
acceptor_.async_accept(new_connection->socket(),
boost::bind(&tcp_server::handle_accept, this, new_connection,
asio::placeholders::error));
}
void handle_accept(tcp_connection::pointer new_connection,
const asio::error_code& error)
{
if (!error)
{
new_connection->start();
}
start_accept();
}
asio::io_context& io_context_;
tcp::acceptor acceptor_;
};
int main()
{
try
{
asio::io_context io_context;
tcp_server server(io_context);
io_context.run();
}
catch (std::exception& e)
{
std::cerr << e.what() << std::endl;
}
return 0;
}
Return to Daytime.3 - An asynchronous
TCP daytime server