8d5bd286d7
`asio::spawn` is an extension, which is not part of the Networking TS, so the `net` alias is not appropriate in this case. Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>
171 lines
5.1 KiB
C++
171 lines
5.1 KiB
C++
//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/beast
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//
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//------------------------------------------------------------------------------
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//
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// Example: WebSocket SSL client, coroutine
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//
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//------------------------------------------------------------------------------
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#include "example/common/root_certificates.hpp"
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#include <boost/beast/core.hpp>
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#include <boost/beast/ssl.hpp>
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#include <boost/beast/websocket.hpp>
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#include <boost/beast/websocket/ssl.hpp>
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#include <boost/asio/spawn.hpp>
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#include <cstdlib>
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#include <functional>
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#include <iostream>
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#include <string>
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namespace beast = boost::beast; // from <boost/beast.hpp>
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namespace http = beast::http; // from <boost/beast/http.hpp>
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namespace websocket = beast::websocket; // from <boost/beast/websocket.hpp>
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namespace net = boost::asio; // from <boost/asio.hpp>
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namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
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using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
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//------------------------------------------------------------------------------
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// Report a failure
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void
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fail(beast::error_code ec, char const* what)
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{
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std::cerr << what << ": " << ec.message() << "\n";
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}
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// Sends a WebSocket message and prints the response
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void
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do_session(
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std::string const& host,
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std::string const& port,
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std::string const& text,
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net::io_context& ioc,
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ssl::context& ctx,
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net::yield_context yield)
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{
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beast::error_code ec;
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// These objects perform our I/O
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tcp::resolver resolver(ioc);
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websocket::stream<
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beast::ssl_stream<beast::tcp_stream>> ws(ioc, ctx);
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// Look up the domain name
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auto const results = resolver.async_resolve(host, port, yield[ec]);
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if(ec)
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return fail(ec, "resolve");
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// Set a timeout on the operation
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beast::get_lowest_layer(ws).expires_after(std::chrono::seconds(30));
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// Make the connection on the IP address we get from a lookup
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beast::get_lowest_layer(ws).async_connect(results, yield[ec]);
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if(ec)
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return fail(ec, "connect");
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// Set a timeout on the operation
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beast::get_lowest_layer(ws).expires_after(std::chrono::seconds(30));
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// Set a decorator to change the User-Agent of the handshake
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ws.set_option(websocket::stream_base::decorator(
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[](websocket::request_type& req)
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{
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req.set(http::field::user_agent,
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std::string(BOOST_BEAST_VERSION_STRING) +
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" websocket-client-coro");
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}));
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// Perform the SSL handshake
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ws.next_layer().async_handshake(ssl::stream_base::client, yield[ec]);
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if(ec)
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return fail(ec, "ssl_handshake");
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// Turn off the timeout on the tcp_stream, because
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// the websocket stream has its own timeout system.
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beast::get_lowest_layer(ws).expires_never();
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// Set suggested timeout settings for the websocket
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ws.set_option(
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websocket::stream_base::timeout::suggested(
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beast::role_type::client));
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// Perform the websocket handshake
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ws.async_handshake(host, "/", yield[ec]);
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if(ec)
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return fail(ec, "handshake");
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// Send the message
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ws.async_write(net::buffer(std::string(text)), yield[ec]);
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if(ec)
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return fail(ec, "write");
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// This buffer will hold the incoming message
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beast::flat_buffer buffer;
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// Read a message into our buffer
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ws.async_read(buffer, yield[ec]);
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if(ec)
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return fail(ec, "read");
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// Close the WebSocket connection
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ws.async_close(websocket::close_code::normal, yield[ec]);
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if(ec)
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return fail(ec, "close");
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// If we get here then the connection is closed gracefully
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// The make_printable() function helps print a ConstBufferSequence
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std::cout << beast::make_printable(buffer.data()) << std::endl;
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}
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//------------------------------------------------------------------------------
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int main(int argc, char** argv)
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{
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// Check command line arguments.
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if(argc != 4)
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{
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std::cerr <<
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"Usage: websocket-client-coro-ssl <host> <port> <text>\n" <<
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"Example:\n" <<
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" websocket-client-coro-ssl echo.websocket.org 443 \"Hello, world!\"\n";
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return EXIT_FAILURE;
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}
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auto const host = argv[1];
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auto const port = argv[2];
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auto const text = argv[3];
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// The io_context is required for all I/O
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net::io_context ioc;
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// The SSL context is required, and holds certificates
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ssl::context ctx{ssl::context::tlsv12_client};
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// This holds the root certificate used for verification
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load_root_certificates(ctx);
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// Launch the asynchronous operation
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boost::asio::spawn(ioc, std::bind(
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&do_session,
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std::string(host),
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std::string(port),
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std::string(text),
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std::ref(ioc),
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std::ref(ctx),
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std::placeholders::_1));
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// Run the I/O service. The call will return when
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// the socket is closed.
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ioc.run();
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return EXIT_SUCCESS;
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}
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