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Diffstat (limited to 'src/boost/libs/beast/example/http/server/coro/http_server_coro.cpp')
| -rw-r--r-- | src/boost/libs/beast/example/http/server/coro/http_server_coro.cpp | 387 |
1 files changed, 387 insertions, 0 deletions
diff --git a/src/boost/libs/beast/example/http/server/coro/http_server_coro.cpp b/src/boost/libs/beast/example/http/server/coro/http_server_coro.cpp new file mode 100644 index 000000000..a8baae640 --- /dev/null +++ b/src/boost/libs/beast/example/http/server/coro/http_server_coro.cpp @@ -0,0 +1,387 @@ +// +// 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: HTTP server, coroutine +// +//------------------------------------------------------------------------------ + +#include <boost/beast/core.hpp> +#include <boost/beast/http.hpp> +#include <boost/beast/version.hpp> +#include <boost/asio/ip/tcp.hpp> +#include <boost/asio/spawn.hpp> +#include <boost/config.hpp> +#include <algorithm> +#include <cstdlib> +#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 net = boost::asio; // from <boost/asio.hpp> +using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp> + +// Return a reasonable mime type based on the extension of a file. +beast::string_view +mime_type(beast::string_view path) +{ + using beast::iequals; + auto const ext = [&path] + { + auto const pos = path.rfind("."); + if(pos == beast::string_view::npos) + return beast::string_view{}; + return path.substr(pos); + }(); + if(iequals(ext, ".htm")) return "text/html"; + if(iequals(ext, ".html")) return "text/html"; + if(iequals(ext, ".php")) return "text/html"; + if(iequals(ext, ".css")) return "text/css"; + if(iequals(ext, ".txt")) return "text/plain"; + if(iequals(ext, ".js")) return "application/javascript"; + if(iequals(ext, ".json")) return "application/json"; + if(iequals(ext, ".xml")) return "application/xml"; + if(iequals(ext, ".swf")) return "application/x-shockwave-flash"; + if(iequals(ext, ".flv")) return "video/x-flv"; + if(iequals(ext, ".png")) return "image/png"; + if(iequals(ext, ".jpe")) return "image/jpeg"; + if(iequals(ext, ".jpeg")) return "image/jpeg"; + if(iequals(ext, ".jpg")) return "image/jpeg"; + if(iequals(ext, ".gif")) return "image/gif"; + if(iequals(ext, ".bmp")) return "image/bmp"; + if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon"; + if(iequals(ext, ".tiff")) return "image/tiff"; + if(iequals(ext, ".tif")) return "image/tiff"; + if(iequals(ext, ".svg")) return "image/svg+xml"; + if(iequals(ext, ".svgz")) return "image/svg+xml"; + return "application/text"; +} + +// Append an HTTP rel-path to a local filesystem path. +// The returned path is normalized for the platform. +std::string +path_cat( + beast::string_view base, + beast::string_view path) +{ + if(base.empty()) + return std::string(path); + std::string result(base); +#ifdef BOOST_MSVC + char constexpr path_separator = '\\'; + if(result.back() == path_separator) + result.resize(result.size() - 1); + result.append(path.data(), path.size()); + for(auto& c : result) + if(c == '/') + c = path_separator; +#else + char constexpr path_separator = '/'; + if(result.back() == path_separator) + result.resize(result.size() - 1); + result.append(path.data(), path.size()); +#endif + return result; +} + +// This function produces an HTTP response for the given +// request. The type of the response object depends on the +// contents of the request, so the interface requires the +// caller to pass a generic lambda for receiving the response. +template< + class Body, class Allocator, + class Send> +void +handle_request( + beast::string_view doc_root, + http::request<Body, http::basic_fields<Allocator>>&& req, + Send&& send) +{ + // Returns a bad request response + auto const bad_request = + [&req](beast::string_view why) + { + http::response<http::string_body> res{http::status::bad_request, req.version()}; + res.set(http::field::server, BOOST_BEAST_VERSION_STRING); + res.set(http::field::content_type, "text/html"); + res.keep_alive(req.keep_alive()); + res.body() = std::string(why); + res.prepare_payload(); + return res; + }; + + // Returns a not found response + auto const not_found = + [&req](beast::string_view target) + { + http::response<http::string_body> res{http::status::not_found, req.version()}; + res.set(http::field::server, BOOST_BEAST_VERSION_STRING); + res.set(http::field::content_type, "text/html"); + res.keep_alive(req.keep_alive()); + res.body() = "The resource '" + std::string(target) + "' was not found."; + res.prepare_payload(); + return res; + }; + + // Returns a server error response + auto const server_error = + [&req](beast::string_view what) + { + http::response<http::string_body> res{http::status::internal_server_error, req.version()}; + res.set(http::field::server, BOOST_BEAST_VERSION_STRING); + res.set(http::field::content_type, "text/html"); + res.keep_alive(req.keep_alive()); + res.body() = "An error occurred: '" + std::string(what) + "'"; + res.prepare_payload(); + return res; + }; + + // Make sure we can handle the method + if( req.method() != http::verb::get && + req.method() != http::verb::head) + return send(bad_request("Unknown HTTP-method")); + + // Request path must be absolute and not contain "..". + if( req.target().empty() || + req.target()[0] != '/' || + req.target().find("..") != beast::string_view::npos) + return send(bad_request("Illegal request-target")); + + // Build the path to the requested file + std::string path = path_cat(doc_root, req.target()); + if(req.target().back() == '/') + path.append("index.html"); + + // Attempt to open the file + beast::error_code ec; + http::file_body::value_type body; + body.open(path.c_str(), beast::file_mode::scan, ec); + + // Handle the case where the file doesn't exist + if(ec == beast::errc::no_such_file_or_directory) + return send(not_found(req.target())); + + // Handle an unknown error + if(ec) + return send(server_error(ec.message())); + + // Cache the size since we need it after the move + auto const size = body.size(); + + // Respond to HEAD request + if(req.method() == http::verb::head) + { + http::response<http::empty_body> res{http::status::ok, req.version()}; + res.set(http::field::server, BOOST_BEAST_VERSION_STRING); + res.set(http::field::content_type, mime_type(path)); + res.content_length(size); + res.keep_alive(req.keep_alive()); + return send(std::move(res)); + } + + // Respond to GET request + http::response<http::file_body> res{ + std::piecewise_construct, + std::make_tuple(std::move(body)), + std::make_tuple(http::status::ok, req.version())}; + res.set(http::field::server, BOOST_BEAST_VERSION_STRING); + res.set(http::field::content_type, mime_type(path)); + res.content_length(size); + res.keep_alive(req.keep_alive()); + return send(std::move(res)); +} + +//------------------------------------------------------------------------------ + +// Report a failure +void +fail(beast::error_code ec, char const* what) +{ + std::cerr << what << ": " << ec.message() << "\n"; +} + +// This is the C++11 equivalent of a generic lambda. +// The function object is used to send an HTTP message. +struct send_lambda +{ + beast::tcp_stream& stream_; + bool& close_; + beast::error_code& ec_; + net::yield_context yield_; + + send_lambda( + beast::tcp_stream& stream, + bool& close, + beast::error_code& ec, + net::yield_context yield) + : stream_(stream) + , close_(close) + , ec_(ec) + , yield_(yield) + { + } + + template<bool isRequest, class Body, class Fields> + void + operator()(http::message<isRequest, Body, Fields>&& msg) const + { + // Determine if we should close the connection after + close_ = msg.need_eof(); + + // We need the serializer here because the serializer requires + // a non-const file_body, and the message oriented version of + // http::write only works with const messages. + http::serializer<isRequest, Body, Fields> sr{msg}; + http::async_write(stream_, sr, yield_[ec_]); + } +}; + +// Handles an HTTP server connection +void +do_session( + beast::tcp_stream& stream, + std::shared_ptr<std::string const> const& doc_root, + net::yield_context yield) +{ + bool close = false; + beast::error_code ec; + + // This buffer is required to persist across reads + beast::flat_buffer buffer; + + // This lambda is used to send messages + send_lambda lambda{stream, close, ec, yield}; + + for(;;) + { + // Set the timeout. + stream.expires_after(std::chrono::seconds(30)); + + // Read a request + http::request<http::string_body> req; + http::async_read(stream, buffer, req, yield[ec]); + if(ec == http::error::end_of_stream) + break; + if(ec) + return fail(ec, "read"); + + // Send the response + handle_request(*doc_root, std::move(req), lambda); + if(ec) + return fail(ec, "write"); + if(close) + { + // This means we should close the connection, usually because + // the response indicated the "Connection: close" semantic. + break; + } + } + + // Send a TCP shutdown + stream.socket().shutdown(tcp::socket::shutdown_send, ec); + + // At this point the connection is closed gracefully +} + +//------------------------------------------------------------------------------ + +// Accepts incoming connections and launches the sessions +void +do_listen( + net::io_context& ioc, + tcp::endpoint endpoint, + std::shared_ptr<std::string const> const& doc_root, + net::yield_context yield) +{ + beast::error_code ec; + + // Open the acceptor + tcp::acceptor acceptor(ioc); + acceptor.open(endpoint.protocol(), ec); + if(ec) + return fail(ec, "open"); + + // Allow address reuse + acceptor.set_option(net::socket_base::reuse_address(true), ec); + if(ec) + return fail(ec, "set_option"); + + // Bind to the server address + acceptor.bind(endpoint, ec); + if(ec) + return fail(ec, "bind"); + + // Start listening for connections + acceptor.listen(net::socket_base::max_listen_connections, ec); + if(ec) + return fail(ec, "listen"); + + for(;;) + { + tcp::socket socket(ioc); + acceptor.async_accept(socket, yield[ec]); + if(ec) + fail(ec, "accept"); + else + boost::asio::spawn( + acceptor.get_executor(), + std::bind( + &do_session, + beast::tcp_stream(std::move(socket)), + doc_root, + std::placeholders::_1)); + } +} + +int main(int argc, char* argv[]) +{ + // Check command line arguments. + if (argc != 5) + { + std::cerr << + "Usage: http-server-coro <address> <port> <doc_root> <threads>\n" << + "Example:\n" << + " http-server-coro 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 doc_root = std::make_shared<std::string>(argv[3]); + auto const threads = std::max<int>(1, std::atoi(argv[4])); + + // The io_context is required for all I/O + net::io_context ioc{threads}; + + // Spawn a listening port + boost::asio::spawn(ioc, + std::bind( + &do_listen, + std::ref(ioc), + tcp::endpoint{address, port}, + doc_root, + std::placeholders::_1)); + + // 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; +} |