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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/boostorg/beast | |
8 | // | |
9 | ||
10 | //------------------------------------------------------------------------------ | |
11 | // | |
12 | // Example: WebSocket server, synchronous | |
13 | // | |
14 | //------------------------------------------------------------------------------ | |
15 | ||
16 | #include <boost/beast/core.hpp> | |
17 | #include <boost/beast/websocket.hpp> | |
18 | #include <boost/asio/ip/tcp.hpp> | |
19 | #include <cstdlib> | |
20 | #include <functional> | |
21 | #include <iostream> | |
22 | #include <string> | |
23 | #include <thread> | |
24 | ||
25 | namespace beast = boost::beast; // from <boost/beast.hpp> | |
26 | namespace http = beast::http; // from <boost/beast/http.hpp> | |
27 | namespace websocket = beast::websocket; // from <boost/beast/websocket.hpp> | |
28 | namespace net = boost::asio; // from <boost/asio.hpp> | |
29 | using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp> | |
30 | ||
31 | //------------------------------------------------------------------------------ | |
32 | ||
33 | // Echoes back all received WebSocket messages | |
34 | void | |
35 | do_session(tcp::socket socket) | |
36 | { | |
37 | try | |
38 | { | |
39 | // Construct the stream by moving in the socket | |
40 | websocket::stream<tcp::socket> ws{std::move(socket)}; | |
41 | ||
42 | // Set a decorator to change the Server of the handshake | |
43 | ws.set_option(websocket::stream_base::decorator( | |
44 | [](websocket::response_type& res) | |
45 | { | |
46 | res.set(http::field::server, | |
47 | std::string(BOOST_BEAST_VERSION_STRING) + | |
48 | " websocket-server-sync"); | |
49 | })); | |
50 | ||
51 | // Accept the websocket handshake | |
52 | ws.accept(); | |
53 | ||
54 | for(;;) | |
55 | { | |
56 | // This buffer will hold the incoming message | |
57 | beast::flat_buffer buffer; | |
58 | ||
59 | // Read a message | |
60 | ws.read(buffer); | |
61 | ||
62 | // Echo the message back | |
63 | ws.text(ws.got_text()); | |
64 | ws.write(buffer.data()); | |
65 | } | |
66 | } | |
67 | catch(beast::system_error const& se) | |
68 | { | |
69 | // This indicates that the session was closed | |
70 | if(se.code() != websocket::error::closed) | |
71 | std::cerr << "Error: " << se.code().message() << std::endl; | |
72 | } | |
73 | catch(std::exception const& e) | |
74 | { | |
75 | std::cerr << "Error: " << e.what() << std::endl; | |
76 | } | |
77 | } | |
78 | ||
79 | //------------------------------------------------------------------------------ | |
80 | ||
81 | int main(int argc, char* argv[]) | |
82 | { | |
83 | try | |
84 | { | |
85 | // Check command line arguments. | |
86 | if (argc != 3) | |
87 | { | |
88 | std::cerr << | |
89 | "Usage: websocket-server-sync <address> <port>\n" << | |
90 | "Example:\n" << | |
91 | " websocket-server-sync 0.0.0.0 8080\n"; | |
92 | return EXIT_FAILURE; | |
93 | } | |
94 | auto const address = net::ip::make_address(argv[1]); | |
95 | auto const port = static_cast<unsigned short>(std::atoi(argv[2])); | |
96 | ||
97 | // The io_context is required for all I/O | |
98 | net::io_context ioc{1}; | |
99 | ||
100 | // The acceptor receives incoming connections | |
101 | tcp::acceptor acceptor{ioc, {address, port}}; | |
102 | for(;;) | |
103 | { | |
104 | // This will receive the new connection | |
105 | tcp::socket socket{ioc}; | |
106 | ||
107 | // Block until we get a connection | |
108 | acceptor.accept(socket); | |
109 | ||
110 | // Launch the session, transferring ownership of the socket | |
111 | std::thread( | |
112 | &do_session, | |
113 | std::move(socket)).detach(); | |
114 | } | |
115 | } | |
116 | catch (const std::exception& e) | |
117 | { | |
118 | std::cerr << "Error: " << e.what() << std::endl; | |
119 | return EXIT_FAILURE; | |
120 | } | |
121 | } |