server.cpp

//------------------------------------------------------------------------------
/*
    WebSocket chat server

    This implements a multi-user chat room using WebSocket.
*/
//------------------------------------------------------------------------------

#include "listener.hpp"
#include "shared_state.hpp"
#include <boost/asio/signal_set.hpp>
#include <iostream>

int
main(int argc, char* argv[])
{
    // Check command line arguments.
    if (argc != 3)
    {
        std::cerr <<
            "Usage: websocket-chat-server <address> <port>\n" <<
            "Example:\n" <<
            "    websocket-chat-server 0.0.0.0 8080\n";
        return EXIT_FAILURE;
    }
    auto address = asio::ip::make_address(argv[1]);
    auto port = static_cast<unsigned short>(std::atoi(argv[2]));

    // The io_context is required for all I/O
    asio::io_context ioc;

    // Create and launch a listening port
    std::make_shared<listener>(
        ioc,
        tcp::endpoint{address, port},
        std::make_shared<shared_state>())->run();

    // Capture SIGINT and SIGTERM to perform a clean shutdown
    asio::signal_set signals(ioc, SIGINT, SIGTERM);
    signals.async_wait(
        [&ioc](boost::system::error_code const&, int)
        {
            // Stop the io_context. This will cause run()
            // to return immediately, eventually destroying the
            // io_context and any remaining handlers in it.
            ioc.stop();
        });

    // Run the I/O service on the main thread
    ioc.run();

    // (If we get here, it means we got a SIGINT or SIGTERM)

    return EXIT_SUCCESS;
}