Boost Beast Websocket Server Async with any_io_executor - FAILING

websocket_server_async.cpp

//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//

//------------------------------------------------------------------------------
//
// Example: WebSocket server, asynchronous
//
//------------------------------------------------------------------------------

#include <boost/asio.hpp>
#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/asio/dispatch.hpp>
#include <boost/asio/strand.hpp>
#include <boost/thread.hpp>

#include <algorithm>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <memory>
#include <string>
#include <thread>
#include <vector>

namespace beast = boost::beast;         // from <boost/beast.hpp>
namespace http = beast::http;           // from <boost/beast/http.hpp>
namespace websocket = beast::websocket; // from <boost/beast/websocket.hpp>
namespace net = boost::asio;            // from <boost/asio.hpp>
using tcp = boost::asio::ip::tcp;       // from <boost/asio/ip/tcp.hpp>

//------------------------------------------------------------------------------

// Report a failure
void
fail(beast::error_code ec, char const* what)
{
    std::cerr << what << ": " << ec.message() << "\n";
}

// Echoes back all received WebSocket messages
class session : public std::enable_shared_from_this<session>
{
    websocket::stream<beast::tcp_stream> ws_;
    beast::flat_buffer buffer_;

public:
    // Take ownership of the socket
    explicit
        session(tcp::socket&& socket)
        : ws_(std::move(socket))
    {
    }

    // Get on the correct executor
    void
        run()
    {
        // We need to be executing within a strand to perform async operations
        // on the I/O objects in this session. Although not strictly necessary
        // for single-threaded contexts, this example code is written to be
        // thread-safe by default.
        net::dispatch(ws_.get_executor(),
            beast::bind_front_handler(
                &session::on_run,
                shared_from_this()));
    }

    // Start the asynchronous operation
    void
        on_run()
    {
        // Set suggested timeout settings for the websocket
        ws_.set_option(
            websocket::stream_base::timeout::suggested(
                beast::role_type::server));

        // Set a decorator to change the Server of the handshake
        ws_.set_option(websocket::stream_base::decorator(
            [](websocket::response_type& res)
            {
                res.set(http::field::server,
                std::string(BOOST_BEAST_VERSION_STRING) +
                " websocket-server-async");
            }));
        // Accept the websocket handshake
        ws_.async_accept(
            beast::bind_front_handler(
                &session::on_accept,
                shared_from_this()));
    }

    void
        on_accept(beast::error_code ec)
    {
        if (ec)
            return fail(ec, "accept");

        // Read a message
        do_read();
    }

    void
        do_read()
    {
        // Read a message into our buffer
        ws_.async_read(
            buffer_,
            beast::bind_front_handler(
                &session::on_read,
                shared_from_this()));
    }

    void
        on_read(
            beast::error_code ec,
            std::size_t bytes_transferred)
    {
        boost::ignore_unused(bytes_transferred);

        // This indicates that the session was closed
        if (ec == websocket::error::closed)
            return;

        if (ec)
            return fail(ec, "read");

        // Echo the message
        ws_.text(ws_.got_text());
        ws_.async_write(
            buffer_.data(),
            beast::bind_front_handler(
                &session::on_write,
                shared_from_this()));
    }

    void
        on_write(
            beast::error_code ec,
            std::size_t bytes_transferred)
    {
        boost::ignore_unused(bytes_transferred);

        if (ec)
            return fail(ec, "write");

        // Clear the buffer
        buffer_.consume(buffer_.size());

        // Do another read
        do_read();
    }
};

//------------------------------------------------------------------------------

// Accepts incoming connections and launches the sessions
class listener : public std::enable_shared_from_this<listener>
{
    net::any_io_executor ioc_;
    tcp::acceptor acceptor_;

public:
    listener(
        net::any_io_executor ioc,
        tcp::endpoint endpoint)
        : ioc_(ioc)
        , acceptor_(ioc)
    {
        beast::error_code ec;

        // Open the acceptor
        acceptor_.open(endpoint.protocol(), ec);
        if (ec)
        {
            fail(ec, "open");
            return;
        }

        // Allow address reuse
        acceptor_.set_option(net::socket_base::reuse_address(true), ec);
        if (ec)
        {
            fail(ec, "set_option");
            return;
        }

        // Bind to the server address
        acceptor_.bind(endpoint, ec);
        if (ec)
        {
            fail(ec, "bind");
            return;
        }

        // Start listening for connections
        acceptor_.listen(
            net::socket_base::max_listen_connections, ec);
        if (ec)
        {
            fail(ec, "listen");
            return;
        }
    }

    // Start accepting incoming connections
    void
        run()
    {
        do_accept();
    }

private:
    void
        do_accept()
    {
        // The new connection gets its own strand
        acceptor_.async_accept(
            net::make_strand(ioc_),
            beast::bind_front_handler(
                &listener::on_accept,
                shared_from_this()));
    }

    void
        on_accept(beast::error_code ec, tcp::socket socket)
    {
        if (ec)
        {
            fail(ec, "accept");
        }
        else
        {
            // Create the session and run it
            std::make_shared<session>(std::move(socket))->run();
        }

        // Accept another connection
        do_accept();
    }
};

//------------------------------------------------------------------------------

int main(int argc, char* argv[])
{
    // Check command line arguments.
    /*if (argc != 4)
    {
        std::cerr <<
            "Usage: websocket-server-async <address> <port> <threads>\n" <<
            "Example:\n" <<
            "    websocket-server-async 0.0.0.0 8080 1\n";
        return EXIT_FAILURE;
    }
    auto const address = net::ip::make_address(argv[1]);
    auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
    auto const threads = std::max<int>(1, std::atoi(argv[3]));
    */

    auto const address = net::ip::make_address("0.0.0.0");
    auto const port = 8080;
    //auto const threads = 4;
    // The io_context is required for all I/O
    //net::io_context ioc{ threads };


    net::thread_pool* io_context;
    boost::asio::high_resolution_timer* timer;
    io_context = new boost::asio::thread_pool();
    timer = new boost::asio::high_resolution_timer(*io_context);
    // Create and launch a listening port
    std::make_shared<listener>(io_context->get_executor(), tcp::endpoint{address, port})->run();

    while (true)
    {
        Sleep(100);
    }
    
    return EXIT_SUCCESS;
}