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//
// 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, synchronous
//
//------------------------------------------------------------------------------
#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/asio/ip/tcp.hpp>
#include <cstdlib>
#include <functional>
#include <iostream>
#include <string>
#include <thread>
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>
//------------------------------------------------------------------------------
// Echoes back all received WebSocket messages
void
do_session(tcp::socket& socket)
{
try
{
// Construct the stream by moving in the socket
websocket::stream<tcp::socket> ws{std::move(socket)};
// 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-sync");
}));
// Accept the websocket handshake
ws.accept();
for(;;)
{
// This buffer will hold the incoming message
beast::flat_buffer buffer;
// Read a message
ws.read(buffer);
// Echo the message back
ws.text(ws.got_text());
ws.write(buffer.data());
}
}
catch(beast::system_error const& se)
{
// This indicates that the session was closed
if(se.code() != websocket::error::closed)
std::cerr << "Error: " << se.code().message() << std::endl;
}
catch(std::exception const& e)
{
std::cerr << "Error: " << e.what() << std::endl;
}
}
//------------------------------------------------------------------------------
int main(int argc, char* argv[])
{
try
{
// Check command line arguments.
if (argc != 3)
{
std::cerr <<
"Usage: websocket-server-sync <address> <port>\n" <<
"Example:\n" <<
" websocket-server-sync 0.0.0.0 8080\n";
return EXIT_FAILURE;
}
auto const address = net::ip::make_address(argv[1]);
auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
// The io_context is required for all I/O
net::io_context ioc{1};
// The acceptor receives incoming connections
tcp::acceptor acceptor{ioc, {address, port}};
for(;;)
{
// This will receive the new connection
tcp::socket socket{ioc};
// Block until we get a connection
acceptor.accept(socket);
// Launch the session, transferring ownership of the socket
std::thread{std::bind(
&do_session,
std::move(socket))}.detach();
}
}
catch (const std::exception& e)
{
std::cerr << "Error: " << e.what() << std::endl;
return EXIT_FAILURE;
}
}
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