252 lines
6.9 KiB
C++
252 lines
6.9 KiB
C++
//
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// Copyright (c) 2017 Christopher M. Kohlhoff (chris at kohlhoff 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: HTTP server, small
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//
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//------------------------------------------------------------------------------
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#include <boost/beast/core.hpp>
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#include <boost/beast/http.hpp>
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#include <boost/beast/version.hpp>
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#include <boost/asio.hpp>
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#include <chrono>
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#include <cstdlib>
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#include <ctime>
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#include <iostream>
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#include <memory>
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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 net = boost::asio; // from <boost/asio.hpp>
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using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
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namespace my_program_state
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{
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std::size_t
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request_count()
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{
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static std::size_t count = 0;
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return ++count;
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}
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std::time_t
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now()
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{
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return std::time(0);
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}
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}
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class http_connection : public std::enable_shared_from_this<http_connection>
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{
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public:
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http_connection(tcp::socket socket)
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: socket_(std::move(socket))
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{
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}
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// Initiate the asynchronous operations associated with the connection.
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void
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start()
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{
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read_request();
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check_deadline();
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}
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private:
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// The socket for the currently connected client.
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tcp::socket socket_;
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// The buffer for performing reads.
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beast::flat_buffer buffer_{8192};
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// The request message.
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http::request<http::dynamic_body> request_;
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// The response message.
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http::response<http::dynamic_body> response_;
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// The timer for putting a deadline on connection processing.
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net::steady_timer deadline_{
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socket_.get_executor(), std::chrono::seconds(60)};
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// Asynchronously receive a complete request message.
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void
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read_request()
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{
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auto self = shared_from_this();
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http::async_read(
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socket_,
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buffer_,
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request_,
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[self](beast::error_code ec,
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std::size_t bytes_transferred)
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{
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boost::ignore_unused(bytes_transferred);
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if(!ec)
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self->process_request();
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});
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}
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// Determine what needs to be done with the request message.
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void
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process_request()
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{
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response_.version(request_.version());
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response_.keep_alive(false);
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switch(request_.method())
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{
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case http::verb::get:
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response_.result(http::status::ok);
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response_.set(http::field::server, "Beast");
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create_response();
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break;
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default:
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// We return responses indicating an error if
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// we do not recognize the request method.
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response_.result(http::status::bad_request);
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response_.set(http::field::content_type, "text/plain");
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beast::ostream(response_.body())
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<< "Invalid request-method '"
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<< std::string(request_.method_string())
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<< "'";
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break;
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}
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write_response();
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}
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// Construct a response message based on the program state.
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void
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create_response()
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{
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if(request_.target() == "/count")
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{
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response_.set(http::field::content_type, "text/html");
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beast::ostream(response_.body())
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<< "<html>\n"
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<< "<head><title>Request count</title></head>\n"
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<< "<body>\n"
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<< "<h1>Request count</h1>\n"
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<< "<p>There have been "
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<< my_program_state::request_count()
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<< " requests so far.</p>\n"
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<< "</body>\n"
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<< "</html>\n";
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}
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else if(request_.target() == "/time")
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{
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response_.set(http::field::content_type, "text/html");
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beast::ostream(response_.body())
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<< "<html>\n"
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<< "<head><title>Current time</title></head>\n"
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<< "<body>\n"
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<< "<h1>Current time</h1>\n"
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<< "<p>The current time is "
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<< my_program_state::now()
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<< " seconds since the epoch.</p>\n"
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<< "</body>\n"
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<< "</html>\n";
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}
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else
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{
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response_.result(http::status::not_found);
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response_.set(http::field::content_type, "text/plain");
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beast::ostream(response_.body()) << "File not found\r\n";
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}
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}
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// Asynchronously transmit the response message.
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void
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write_response()
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{
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auto self = shared_from_this();
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response_.set(http::field::content_length, response_.body().size());
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http::async_write(
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socket_,
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response_,
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[self](beast::error_code ec, std::size_t)
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{
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self->socket_.shutdown(tcp::socket::shutdown_send, ec);
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self->deadline_.cancel();
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});
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}
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// Check whether we have spent enough time on this connection.
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void
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check_deadline()
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{
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auto self = shared_from_this();
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deadline_.async_wait(
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[self](beast::error_code ec)
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{
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if(!ec)
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{
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// Close socket to cancel any outstanding operation.
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self->socket_.close(ec);
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}
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});
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}
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};
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// "Loop" forever accepting new connections.
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void
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http_server(tcp::acceptor& acceptor, tcp::socket& socket)
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{
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acceptor.async_accept(socket,
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[&](beast::error_code ec)
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{
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if(!ec)
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std::make_shared<http_connection>(std::move(socket))->start();
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http_server(acceptor, socket);
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});
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}
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int
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main(int argc, char* argv[])
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{
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try
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{
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// Check command line arguments.
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if(argc != 3)
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{
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std::cerr << "Usage: " << argv[0] << " <address> <port>\n";
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std::cerr << " For IPv4, try:\n";
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std::cerr << " receiver 0.0.0.0 80\n";
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std::cerr << " For IPv6, try:\n";
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std::cerr << " receiver 0::0 80\n";
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return EXIT_FAILURE;
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}
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auto const address = net::ip::make_address(argv[1]);
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unsigned short port = static_cast<unsigned short>(std::atoi(argv[2]));
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net::io_context ioc{1};
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tcp::acceptor acceptor{ioc, {address, port}};
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tcp::socket socket{ioc};
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http_server(acceptor, socket);
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ioc.run();
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}
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catch(std::exception const& e)
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{
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std::cerr << "Error: " << e.what() << std::endl;
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return EXIT_FAILURE;
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}
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}
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