1 //
2 // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
3 //
4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 //
7 // Official repository: https://github.com/vinniefalco/CppCon2018
8 //
9
10 //------------------------------------------------------------------------------
11 /*
12 WebSocket chat server, multi-threaded
13
14 This implements a multi-user chat room using WebSocket. The
15 `io_context` runs on any number of threads, specified at
16 the command line.
17
18 */
19 //------------------------------------------------------------------------------
20
21 #include "listener.hpp"
22 #include "shared_state.hpp"
23
24 #include <boost/asio/signal_set.hpp>
25 #include <boost/smart_ptr.hpp>
26 #include <iostream>
27 #include <vector>
28
29 int
main(int argc,char * argv[])30 main(int argc, char* argv[])
31 {
32 // Check command line arguments.
33 if (argc != 5)
34 {
35 std::cerr <<
36 "Usage: websocket-chat-multi <address> <port> <doc_root> <threads>\n" <<
37 "Example:\n" <<
38 " websocket-chat-server 0.0.0.0 8080 . 5\n";
39 return EXIT_FAILURE;
40 }
41 auto address = net::ip::make_address(argv[1]);
42 auto port = static_cast<unsigned short>(std::atoi(argv[2]));
43 auto doc_root = argv[3];
44 auto const threads = std::max<int>(1, std::atoi(argv[4]));
45
46 // The io_context is required for all I/O
47 net::io_context ioc;
48
49 // Create and launch a listening port
50 boost::make_shared<listener>(
51 ioc,
52 tcp::endpoint{address, port},
53 boost::make_shared<shared_state>(doc_root))->run();
54
55 // Capture SIGINT and SIGTERM to perform a clean shutdown
56 net::signal_set signals(ioc, SIGINT, SIGTERM);
57 signals.async_wait(
58 [&ioc](boost::system::error_code const&, int)
59 {
60 // Stop the io_context. This will cause run()
61 // to return immediately, eventually destroying the
62 // io_context and any remaining handlers in it.
63 ioc.stop();
64 });
65
66 // Run the I/O service on the requested number of threads
67 std::vector<std::thread> v;
68 v.reserve(threads - 1);
69 for(auto i = threads - 1; i > 0; --i)
70 v.emplace_back(
71 [&ioc]
72 {
73 ioc.run();
74 });
75 ioc.run();
76
77 // (If we get here, it means we got a SIGINT or SIGTERM)
78
79 // Block until all the threads exit
80 for(auto& t : v)
81 t.join();
82
83 return EXIT_SUCCESS;
84 }
85