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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/vinniefalco/CppCon2018
//
//------------------------------------------------------------------------------
/*
WebSocket chat server, multi-threaded
This implements a multi-user chat room using WebSocket. The
`io_context` runs on any number of threads, specified at
the command line.
*/
//------------------------------------------------------------------------------
#include "listener.hpp"
#include "shared_state.hpp"
#include <boost/asio/signal_set.hpp>
#include <boost/smart_ptr.hpp>
#include <iostream>
#include <vector>
int
main(int argc, char* argv[])
{
// Check command line arguments.
if (argc != 5)
{
std::cerr <<
"Usage: websocket-chat-multi <address> <port> <doc_root> <threads>\n" <<
"Example:\n" <<
" websocket-chat-server 0.0.0.0 8080 . 5\n";
return EXIT_FAILURE;
}
auto address = net::ip::make_address(argv[1]);
auto port = static_cast<unsigned short>(std::atoi(argv[2]));
auto doc_root = argv[3];
auto const threads = std::max<int>(1, std::atoi(argv[4]));
// The io_context is required for all I/O
net::io_context ioc;
// Create and launch a listening port
boost::make_shared<listener>(
ioc,
tcp::endpoint{address, port},
boost::make_shared<shared_state>(doc_root))->run();
// Capture SIGINT and SIGTERM to perform a clean shutdown
net::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 requested number of threads
std::vector<std::thread> v;
v.reserve(threads - 1);
for(auto i = threads - 1; i > 0; --i)
v.emplace_back(
[&ioc]
{
ioc.run();
});
ioc.run();
// (If we get here, it means we got a SIGINT or SIGTERM)
// Block until all the threads exit
for(auto& t : v)
t.join();
return EXIT_SUCCESS;
}
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