//
-// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+// 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)
#include <boost/beast/core.hpp>
#include <boost/beast/http.hpp>
#include <boost/beast/version.hpp>
-#include <boost/asio/bind_executor.hpp>
-#include <boost/asio/ip/tcp.hpp>
+#include <boost/asio/dispatch.hpp>
#include <boost/asio/strand.hpp>
#include <boost/config.hpp>
#include <algorithm>
#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>
-namespace http = boost::beast::http; // from <boost/beast/http.hpp>
// Return a reasonable mime type based on the extension of a file.
-boost::beast::string_view
-mime_type(boost::beast::string_view path)
+beast::string_view
+mime_type(beast::string_view path)
{
- using boost::beast::iequals;
+ using beast::iequals;
auto const ext = [&path]
{
auto const pos = path.rfind(".");
- if(pos == boost::beast::string_view::npos)
- return boost::beast::string_view{};
+ if(pos == beast::string_view::npos)
+ return beast::string_view{};
return path.substr(pos);
}();
if(iequals(ext, ".htm")) return "text/html";
// The returned path is normalized for the platform.
std::string
path_cat(
- boost::beast::string_view base,
- boost::beast::string_view path)
+ beast::string_view base,
+ beast::string_view path)
{
if(base.empty())
- return path.to_string();
- std::string result = base.to_string();
-#if BOOST_MSVC
+ 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);
class Send>
void
handle_request(
- boost::beast::string_view doc_root,
+ 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](boost::beast::string_view why)
+ [&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() = why.to_string();
+ res.body() = std::string(why);
res.prepare_payload();
return res;
};
// Returns a not found response
auto const not_found =
- [&req](boost::beast::string_view target)
+ [&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 '" + target.to_string() + "' was not found.";
+ 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](boost::beast::string_view what)
+ [&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: '" + what.to_string() + "'";
+ res.body() = "An error occurred: '" + std::string(what) + "'";
res.prepare_payload();
return res;
};
// Request path must be absolute and not contain "..".
if( req.target().empty() ||
req.target()[0] != '/' ||
- req.target().find("..") != boost::beast::string_view::npos)
+ req.target().find("..") != beast::string_view::npos)
return send(bad_request("Illegal request-target"));
// Build the path to the requested file
path.append("index.html");
// Attempt to open the file
- boost::beast::error_code ec;
+ beast::error_code ec;
http::file_body::value_type body;
- body.open(path.c_str(), boost::beast::file_mode::scan, ec);
+ body.open(path.c_str(), beast::file_mode::scan, ec);
// Handle the case where the file doesn't exist
- if(ec == boost::system::errc::no_such_file_or_directory)
+ if(ec == beast::errc::no_such_file_or_directory)
return send(not_found(req.target()));
// Handle an unknown error
// Report a failure
void
-fail(boost::system::error_code ec, char const* what)
+fail(beast::error_code ec, char const* what)
{
std::cerr << what << ": " << ec.message() << "\n";
}
// Write the response
http::async_write(
- self_.socket_,
+ self_.stream_,
*sp,
- boost::asio::bind_executor(
- self_.strand_,
- std::bind(
- &session::on_write,
- self_.shared_from_this(),
- std::placeholders::_1,
- std::placeholders::_2,
- sp->need_eof())));
+ beast::bind_front_handler(
+ &session::on_write,
+ self_.shared_from_this(),
+ sp->need_eof()));
}
};
- tcp::socket socket_;
- boost::asio::strand<
- boost::asio::io_context::executor_type> strand_;
- boost::beast::flat_buffer buffer_;
- std::string const& doc_root_;
+ beast::tcp_stream stream_;
+ beast::flat_buffer buffer_;
+ std::shared_ptr<std::string const> doc_root_;
http::request<http::string_body> req_;
std::shared_ptr<void> res_;
send_lambda lambda_;
public:
- // Take ownership of the socket
- explicit
+ // Take ownership of the stream
session(
- tcp::socket socket,
- std::string const& doc_root)
- : socket_(std::move(socket))
- , strand_(socket_.get_executor())
+ tcp::socket&& socket,
+ std::shared_ptr<std::string const> const& doc_root)
+ : stream_(std::move(socket))
, doc_root_(doc_root)
, lambda_(*this)
{
void
run()
{
- do_read();
+ // 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(stream_.get_executor(),
+ beast::bind_front_handler(
+ &session::do_read,
+ shared_from_this()));
}
void
// otherwise the operation behavior is undefined.
req_ = {};
+ // Set the timeout.
+ stream_.expires_after(std::chrono::seconds(30));
+
// Read a request
- http::async_read(socket_, buffer_, req_,
- boost::asio::bind_executor(
- strand_,
- std::bind(
- &session::on_read,
- shared_from_this(),
- std::placeholders::_1,
- std::placeholders::_2)));
+ http::async_read(stream_, buffer_, req_,
+ beast::bind_front_handler(
+ &session::on_read,
+ shared_from_this()));
}
void
on_read(
- boost::system::error_code ec,
+ beast::error_code ec,
std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
return fail(ec, "read");
// Send the response
- handle_request(doc_root_, std::move(req_), lambda_);
+ handle_request(*doc_root_, std::move(req_), lambda_);
}
void
on_write(
- boost::system::error_code ec,
- std::size_t bytes_transferred,
- bool close)
+ bool close,
+ beast::error_code ec,
+ std::size_t bytes_transferred)
{
boost::ignore_unused(bytes_transferred);
do_close()
{
// Send a TCP shutdown
- boost::system::error_code ec;
- socket_.shutdown(tcp::socket::shutdown_send, ec);
+ beast::error_code ec;
+ stream_.socket().shutdown(tcp::socket::shutdown_send, ec);
// At this point the connection is closed gracefully
}
// Accepts incoming connections and launches the sessions
class listener : public std::enable_shared_from_this<listener>
{
+ net::io_context& ioc_;
tcp::acceptor acceptor_;
- tcp::socket socket_;
- std::string const& doc_root_;
+ std::shared_ptr<std::string const> doc_root_;
public:
listener(
- boost::asio::io_context& ioc,
+ net::io_context& ioc,
tcp::endpoint endpoint,
- std::string const& doc_root)
- : acceptor_(ioc)
- , socket_(ioc)
+ std::shared_ptr<std::string const> const& doc_root)
+ : ioc_(ioc)
+ , acceptor_(net::make_strand(ioc))
, doc_root_(doc_root)
{
- boost::system::error_code ec;
+ beast::error_code ec;
// Open the acceptor
acceptor_.open(endpoint.protocol(), ec);
}
// Allow address reuse
- acceptor_.set_option(boost::asio::socket_base::reuse_address(true));
+ acceptor_.set_option(net::socket_base::reuse_address(true), ec);
if(ec)
{
fail(ec, "set_option");
// Start listening for connections
acceptor_.listen(
- boost::asio::socket_base::max_listen_connections, ec);
+ net::socket_base::max_listen_connections, ec);
if(ec)
{
fail(ec, "listen");
void
run()
{
- if(! acceptor_.is_open())
- return;
do_accept();
}
+private:
void
do_accept()
{
+ // The new connection gets its own strand
acceptor_.async_accept(
- socket_,
- std::bind(
+ net::make_strand(ioc_),
+ beast::bind_front_handler(
&listener::on_accept,
- shared_from_this(),
- std::placeholders::_1));
+ shared_from_this()));
}
void
- on_accept(boost::system::error_code ec)
+ on_accept(beast::error_code ec, tcp::socket socket)
{
if(ec)
{
{
// Create the session and run it
std::make_shared<session>(
- std::move(socket_),
+ std::move(socket),
doc_root_)->run();
}
" http-server-async 0.0.0.0 8080 . 1\n";
return EXIT_FAILURE;
}
- auto const address = boost::asio::ip::make_address(argv[1]);
+ auto const address = net::ip::make_address(argv[1]);
auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
- std::string const doc_root = argv[3];
+ 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
- boost::asio::io_context ioc{threads};
+ net::io_context ioc{threads};
// Create and launch a listening port
std::make_shared<listener>(
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