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//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
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// Copyright (c) 2025 Mohammad Nejati
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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, asynchronous Unix domain sockets
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//
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//------------------------------------------------------------------------------
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#include <boost/asio/dispatch.hpp>
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#include <boost/asio/local/stream_protocol.hpp>
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#include <boost/asio/strand.hpp>
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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/config.hpp>
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#include <algorithm>
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#include <cstdlib>
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#include <iostream>
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#include <memory>
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#include <string>
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#include <thread>
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#include <vector>
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#if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
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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 stream_protocol = net::local::stream_protocol; // from <boost/asio/local/stream_protocol.hpp>
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// Return a reasonable mime type based on the extension of a file.
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beast::string_view
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mime_type(beast::string_view path)
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{
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using beast::iequals;
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auto const ext = [&path]
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{
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auto const pos = path.rfind(".");
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if(pos == beast::string_view::npos)
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return beast::string_view{};
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return path.substr(pos);
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}();
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if(iequals(ext, ".htm")) return "text/html";
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if(iequals(ext, ".html")) return "text/html";
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if(iequals(ext, ".php")) return "text/html";
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if(iequals(ext, ".css")) return "text/css";
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if(iequals(ext, ".txt")) return "text/plain";
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if(iequals(ext, ".js")) return "application/javascript";
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if(iequals(ext, ".json")) return "application/json";
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if(iequals(ext, ".xml")) return "application/xml";
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if(iequals(ext, ".swf")) return "application/x-shockwave-flash";
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if(iequals(ext, ".flv")) return "video/x-flv";
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if(iequals(ext, ".png")) return "image/png";
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if(iequals(ext, ".jpe")) return "image/jpeg";
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if(iequals(ext, ".jpeg")) return "image/jpeg";
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if(iequals(ext, ".jpg")) return "image/jpeg";
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if(iequals(ext, ".gif")) return "image/gif";
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if(iequals(ext, ".bmp")) return "image/bmp";
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if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";
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if(iequals(ext, ".tiff")) return "image/tiff";
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if(iequals(ext, ".tif")) return "image/tiff";
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if(iequals(ext, ".svg")) return "image/svg+xml";
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if(iequals(ext, ".svgz")) return "image/svg+xml";
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return "application/text";
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}
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// Append an HTTP rel-path to a local filesystem path.
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// The returned path is normalized for the platform.
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std::string
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path_cat(
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beast::string_view base,
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beast::string_view path)
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{
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if(base.empty())
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return std::string(path);
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std::string result(base);
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#ifdef BOOST_MSVC
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char constexpr path_separator = '\\';
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if(result.back() == path_separator)
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result.resize(result.size() - 1);
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result.append(path.data(), path.size());
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for(auto& c : result)
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if(c == '/')
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c = path_separator;
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#else
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char constexpr path_separator = '/';
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if(result.back() == path_separator)
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result.resize(result.size() - 1);
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result.append(path.data(), path.size());
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#endif
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return result;
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}
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// Return a response for the given request.
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//
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// The concrete type of the response message (which depends on the
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// request), is type-erased in message_generator.
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template <class Body, class Allocator>
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http::message_generator
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handle_request(
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beast::string_view doc_root,
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http::request<Body, http::basic_fields<Allocator>>&& req)
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{
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// Returns a bad request response
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auto const bad_request =
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[&req](beast::string_view why)
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{
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http::response<http::string_body> res{http::status::bad_request, req.version()};
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res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
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res.set(http::field::content_type, "text/html");
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res.keep_alive(req.keep_alive());
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res.body() = std::string(why);
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res.prepare_payload();
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return res;
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};
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// Returns a not found response
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auto const not_found =
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[&req](beast::string_view target)
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{
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http::response<http::string_body> res{http::status::not_found, req.version()};
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res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
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res.set(http::field::content_type, "text/html");
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res.keep_alive(req.keep_alive());
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res.body() = "The resource '" + std::string(target) + "' was not found.";
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res.prepare_payload();
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return res;
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};
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// Returns a server error response
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auto const server_error =
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[&req](beast::string_view what)
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{
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http::response<http::string_body> res{http::status::internal_server_error, req.version()};
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res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
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res.set(http::field::content_type, "text/html");
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res.keep_alive(req.keep_alive());
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res.body() = "An error occurred: '" + std::string(what) + "'";
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res.prepare_payload();
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return res;
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};
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// Make sure we can handle the method
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if( req.method() != http::verb::get &&
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req.method() != http::verb::head)
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return bad_request("Unknown HTTP-method");
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// Request path must be absolute and not contain "..".
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if( req.target().empty() ||
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req.target()[0] != '/' ||
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req.target().find("..") != beast::string_view::npos)
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return bad_request("Illegal request-target");
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// Build the path to the requested file
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std::string path = path_cat(doc_root, req.target());
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if(req.target().back() == '/')
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path.append("index.html");
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// Attempt to open the file
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beast::error_code ec;
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http::file_body::value_type body;
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body.open(path.c_str(), beast::file_mode::scan, ec);
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// Handle the case where the file doesn't exist
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if(ec == beast::errc::no_such_file_or_directory)
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return not_found(req.target());
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// Handle an unknown error
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if(ec)
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return server_error(ec.message());
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// Cache the size since we need it after the move
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auto const size = body.size();
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// Respond to HEAD request
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if(req.method() == http::verb::head)
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{
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http::response<http::empty_body> res{http::status::ok, req.version()};
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res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
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res.set(http::field::content_type, mime_type(path));
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res.content_length(size);
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res.keep_alive(req.keep_alive());
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return res;
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}
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// Respond to GET request
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http::response<http::file_body> res{
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std::piecewise_construct,
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std::make_tuple(std::move(body)),
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std::make_tuple(http::status::ok, req.version())};
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res.set(http::field::server, BOOST_BEAST_VERSION_STRING);
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res.set(http::field::content_type, mime_type(path));
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res.content_length(size);
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res.keep_alive(req.keep_alive());
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return res;
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}
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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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// Handles an HTTP server connection
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class session : public std::enable_shared_from_this<session>
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{
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beast::basic_stream<
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stream_protocol,
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net::any_io_executor,
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beast::unlimited_rate_policy> stream_;
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beast::flat_buffer buffer_;
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std::shared_ptr<std::string const> doc_root_;
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http::request<http::string_body> req_;
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public:
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// Take ownership of the stream
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session(
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stream_protocol::socket&& socket,
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std::shared_ptr<std::string const> const& doc_root)
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: stream_(std::move(socket))
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, doc_root_(doc_root)
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{
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}
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// Start the asynchronous operation
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void
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run()
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{
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// We need to be executing within a strand to perform async operations
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// on the I/O objects in this session. Although not strictly necessary
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// for single-threaded contexts, this example code is written to be
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// thread-safe by default.
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net::dispatch(stream_.get_executor(),
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beast::bind_front_handler(
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&session::do_read,
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shared_from_this()));
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}
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void
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do_read()
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{
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// Make the request empty before reading,
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// otherwise the operation behavior is undefined.
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req_ = {};
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// Set the timeout.
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stream_.expires_after(std::chrono::seconds(30));
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// Read a request
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http::async_read(stream_, buffer_, req_,
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beast::bind_front_handler(
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&session::on_read,
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shared_from_this()));
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}
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void
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on_read(
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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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// This means they closed the connection
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if(ec == http::error::end_of_stream)
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return do_close();
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if(ec)
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return fail(ec, "read");
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// Send the response
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send_response(
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handle_request(*doc_root_, std::move(req_)));
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}
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void
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send_response(http::message_generator&& msg)
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{
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bool keep_alive = msg.keep_alive();
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// Write the response
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beast::async_write(
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stream_,
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std::move(msg),
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beast::bind_front_handler(
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&session::on_write, shared_from_this(), keep_alive));
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}
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void
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on_write(
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bool keep_alive,
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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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return fail(ec, "write");
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if(! keep_alive)
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{
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// This means we should close the connection, usually because
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// the response indicated the "Connection: close" semantic.
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return do_close();
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}
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// Read another request
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do_read();
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}
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void
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do_close()
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{
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// Send a TCP shutdown
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beast::error_code ec;
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stream_.socket().shutdown(stream_protocol::socket::shutdown_send, ec);
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// At this point the connection is closed gracefully
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}
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};
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//------------------------------------------------------------------------------
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// Accepts incoming connections and launches the sessions
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class listener : public std::enable_shared_from_this<listener>
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{
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net::io_context& ioc_;
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stream_protocol::acceptor acceptor_;
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std::shared_ptr<std::string const> doc_root_;
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public:
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listener(
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net::io_context& ioc,
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stream_protocol::endpoint endpoint,
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std::shared_ptr<std::string const> const& doc_root)
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: ioc_(ioc)
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, acceptor_(net::make_strand(ioc), std::move(endpoint))
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, doc_root_(doc_root)
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{
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}
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// Start accepting incoming connections
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void
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run()
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{
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do_accept();
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}
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private:
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void
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do_accept()
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{
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// The new connection gets its own strand
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acceptor_.async_accept(
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net::make_strand(ioc_),
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beast::bind_front_handler(
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&listener::on_accept,
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shared_from_this()));
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}
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void
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on_accept(beast::error_code ec, stream_protocol::socket socket)
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{
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if(ec)
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{
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fail(ec, "accept");
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return; // To avoid infinite loop
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}
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else
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{
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// Create the session and run it
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std::make_shared<session>(
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std::move(socket),
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doc_root_)->run();
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}
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// Accept another connection
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do_accept();
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}
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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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try
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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: http-server-async-local <path> <doc_root> <threads>\n" <<
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"Example:\n" <<
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" http-server-async-local /tmp/http.sock . 1\n";
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return EXIT_FAILURE;
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}
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auto const path = argv[1];
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auto const doc_root = std::make_shared<std::string>(argv[2]);
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auto const threads = std::max<int>(1, std::atoi(argv[3]));
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// The io_context is required for all I/O
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net::io_context ioc{threads};
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// Remove previous binding
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std::remove(path);
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// Create and launch a listening port
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std::make_shared<listener>(
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ioc,
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stream_protocol::endpoint{path},
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doc_root)->run();
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// Run the I/O service on the requested number of threads
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std::vector<std::thread> v;
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v.reserve(threads - 1);
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for(auto i = threads - 1; i > 0; --i)
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v.emplace_back(
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[&ioc]
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{
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ioc.run();
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});
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ioc.run();
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return EXIT_SUCCESS;
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}
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catch(std::exception const& e)
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{
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std::cerr << e.what() << std::endl;
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return EXIT_FAILURE;
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}
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}
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#else
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int
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main(int, char*[])
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{
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std::cerr <<
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"Local sockets not available on this platform" << std::endl;
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return EXIT_FAILURE;
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}
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#endif
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Reference in new issue
Block a user