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- //
- // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- // Official repository: https://github.com/boostorg/beast
- //
- //------------------------------------------------------------------------------
- //
- // Example: WebSocket SSL server, asynchronous
- //
- //------------------------------------------------------------------------------
- #include "example/common/server_certificate.hpp"
- #include <boost/beast/core.hpp>
- #include <boost/beast/ssl.hpp>
- #include <boost/beast/websocket.hpp>
- #include <boost/beast/websocket/ssl.hpp>
- #include <boost/asio/strand.hpp>
- #include <boost/asio/dispatch.hpp>
- #include <algorithm>
- #include <cstdlib>
- #include <functional>
- #include <iostream>
- #include <memory>
- #include <string>
- #include <thread>
- #include <vector>
- namespace beast = boost::beast; // from <boost/beast.hpp>
- namespace http = beast::http; // from <boost/beast/http.hpp>
- namespace websocket = beast::websocket; // from <boost/beast/websocket.hpp>
- namespace net = boost::asio; // from <boost/asio.hpp>
- namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
- using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
- //------------------------------------------------------------------------------
- // Report a failure
- void
- fail(beast::error_code ec, char const* what)
- {
- std::cerr << what << ": " << ec.message() << "\n";
- }
- // Echoes back all received WebSocket messages
- class session : public std::enable_shared_from_this<session>
- {
- websocket::stream<
- beast::ssl_stream<beast::tcp_stream>> ws_;
- beast::flat_buffer buffer_;
- public:
- // Take ownership of the socket
- session(tcp::socket&& socket, ssl::context& ctx)
- : ws_(std::move(socket), ctx)
- {
- }
- // Get on the correct executor
- void
- run()
- {
- // We need to be executing within a strand to perform async operations
- // on the I/O objects in this session. Although not strictly necessary
- // for single-threaded contexts, this example code is written to be
- // thread-safe by default.
- net::dispatch(ws_.get_executor(),
- beast::bind_front_handler(
- &session::on_run,
- shared_from_this()));
- }
- // Start the asynchronous operation
- void
- on_run()
- {
- // Set the timeout.
- beast::get_lowest_layer(ws_).expires_after(std::chrono::seconds(30));
- // Perform the SSL handshake
- ws_.next_layer().async_handshake(
- ssl::stream_base::server,
- beast::bind_front_handler(
- &session::on_handshake,
- shared_from_this()));
- }
- void
- on_handshake(beast::error_code ec)
- {
- if(ec)
- return fail(ec, "handshake");
- // Turn off the timeout on the tcp_stream, because
- // the websocket stream has its own timeout system.
- beast::get_lowest_layer(ws_).expires_never();
- // Set suggested timeout settings for the websocket
- ws_.set_option(
- websocket::stream_base::timeout::suggested(
- beast::role_type::server));
- // Set a decorator to change the Server of the handshake
- ws_.set_option(websocket::stream_base::decorator(
- [](websocket::response_type& res)
- {
- res.set(http::field::server,
- std::string(BOOST_BEAST_VERSION_STRING) +
- " websocket-server-async-ssl");
- }));
- // Accept the websocket handshake
- ws_.async_accept(
- beast::bind_front_handler(
- &session::on_accept,
- shared_from_this()));
- }
- void
- on_accept(beast::error_code ec)
- {
- if(ec)
- return fail(ec, "accept");
- // Read a message
- do_read();
- }
- void
- do_read()
- {
- // Read a message into our buffer
- ws_.async_read(
- buffer_,
- beast::bind_front_handler(
- &session::on_read,
- shared_from_this()));
- }
- void
- on_read(
- beast::error_code ec,
- std::size_t bytes_transferred)
- {
- boost::ignore_unused(bytes_transferred);
- // This indicates that the session was closed
- if(ec == websocket::error::closed)
- return;
- if(ec)
- fail(ec, "read");
- // Echo the message
- ws_.text(ws_.got_text());
- ws_.async_write(
- buffer_.data(),
- beast::bind_front_handler(
- &session::on_write,
- shared_from_this()));
- }
- void
- on_write(
- beast::error_code ec,
- std::size_t bytes_transferred)
- {
- boost::ignore_unused(bytes_transferred);
- if(ec)
- return fail(ec, "write");
- // Clear the buffer
- buffer_.consume(buffer_.size());
- // Do another read
- do_read();
- }
- };
- //------------------------------------------------------------------------------
- // Accepts incoming connections and launches the sessions
- class listener : public std::enable_shared_from_this<listener>
- {
- net::io_context& ioc_;
- ssl::context& ctx_;
- tcp::acceptor acceptor_;
- public:
- listener(
- net::io_context& ioc,
- ssl::context& ctx,
- tcp::endpoint endpoint)
- : ioc_(ioc)
- , ctx_(ctx)
- , acceptor_(net::make_strand(ioc))
- {
- beast::error_code ec;
- // Open the acceptor
- acceptor_.open(endpoint.protocol(), ec);
- if(ec)
- {
- fail(ec, "open");
- return;
- }
- // Allow address reuse
- acceptor_.set_option(net::socket_base::reuse_address(true), ec);
- if(ec)
- {
- fail(ec, "set_option");
- return;
- }
- // Bind to the server address
- acceptor_.bind(endpoint, ec);
- if(ec)
- {
- fail(ec, "bind");
- return;
- }
- // Start listening for connections
- acceptor_.listen(
- net::socket_base::max_listen_connections, ec);
- if(ec)
- {
- fail(ec, "listen");
- return;
- }
- }
- // Start accepting incoming connections
- void
- run()
- {
- do_accept();
- }
- private:
- void
- do_accept()
- {
- // The new connection gets its own strand
- acceptor_.async_accept(
- net::make_strand(ioc_),
- beast::bind_front_handler(
- &listener::on_accept,
- shared_from_this()));
- }
- void
- on_accept(beast::error_code ec, tcp::socket socket)
- {
- if(ec)
- {
- fail(ec, "accept");
- }
- else
- {
- // Create the session and run it
- std::make_shared<session>(std::move(socket), ctx_)->run();
- }
- // Accept another connection
- do_accept();
- }
- };
- //------------------------------------------------------------------------------
- int main(int argc, char* argv[])
- {
- // Check command line arguments.
- if (argc != 4)
- {
- std::cerr <<
- "Usage: websocket-server-async-ssl <address> <port> <threads>\n" <<
- "Example:\n" <<
- " websocket-server-async-ssl 0.0.0.0 8080 1\n";
- return EXIT_FAILURE;
- }
- auto const address = net::ip::make_address(argv[1]);
- auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
- auto const threads = std::max<int>(1, std::atoi(argv[3]));
- // The io_context is required for all I/O
- net::io_context ioc{threads};
- // The SSL context is required, and holds certificates
- ssl::context ctx{ssl::context::tlsv12};
- // This holds the self-signed certificate used by the server
- load_server_certificate(ctx);
- // Create and launch a listening port
- std::make_shared<listener>(ioc, ctx, tcp::endpoint{address, port})->run();
- // Run the I/O service on the requested number of threads
- std::vector<std::thread> v;
- v.reserve(threads - 1);
- for(auto i = threads - 1; i > 0; --i)
- v.emplace_back(
- [&ioc]
- {
- ioc.run();
- });
- ioc.run();
- return EXIT_SUCCESS;
- }
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