Easy WebSocket server and client library implemented using C++14 and Boost.Beast. To start two-way communication, you need an initial handshake (rfc6455 section 1.3). The project uses beast_http_server with all its dependencies.
- Header-only
- Supported text/binary data frames, control ping-pong, close frames.
- Asynchronous/Synchronous request, response handling
- Thread pool support
- Timer manage (default timeout: 10 seconds, default action: Closing connection)
- Platform independent
- TLS/SSL
More examples is here...
Create HTTP server and WS instance:
http::server my_http_server;
ws::server echo;
Define handlers to accept connection and received message:
echo.on_accept = [](auto & /*session*/, auto & /*output*/){
// if it this pull server, an output buffer must be blank
};
echo.on_message = [](auto & /*session*/, auto & input, auto & output){
cout << boost::beast::buffers(input.data()) << endl;
boost::beast::ostream(output) << boost::beast::buffers(input.data()); // echo
};
Start listening server on localhost:80 with new route for GET request with "/echo" resource:
my_http_server.get("/echo", [&echo](auto & req, auto & session){
cout << req << endl;
// See if it is a WebSocket Upgrade
if(boost::beast::websocket::is_upgrade(req))
{
echo.upgrade_session(session.getConnection(), [req](auto & session){
session.do_accept(req);
});
}
});
my_http_server.listen("127.0.0.1", 80, [](auto & session){
http::base::out("New client!!!");
session.do_read();
});
Run the I/O service on the requested number of threads:
uint32_t pool_size = boost::thread::hardware_concurrency() * 2;
http::base::processor::get().start( pool_size > 0 ? pool_size : 4 );
http::base::processor::get().wait();
Define handlers, connect to remote host:
ws::client echo;
echo.on_connect = [](auto & session){
session.do_handshake("/echo");
};
echo.on_handshake = [](auto & /*session*/, auto & res, auto & output, auto & /*next_read*/){
cout << res << endl;
cout << "Send: ";
boost::beast::ostream(output) << read_string(cin, '\n');
};
echo.on_message = [](auto & /*session*/, auto & input, auto & output, auto & /*next_read*/){
cout << "Recv: " << boost::beast::buffers(input.data()) << endl;
cout << "Send: ";
boost::beast::ostream(output) << read_string(cin, '\n');
};
if(!echo.invoke("127.0.0.1", 80, [](auto & error){
cout << "Connection failed with code " << error << endl;
http::base::processor::get().stop();
})){
cout << "Failed to resolve address!" << endl;
return -1;
}
Copyright © 2018 0xdead4ead
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