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 do_session(tcp::socket socket)35do_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 main(int argc,char * argv[])81int 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 } 122