1189 lines
32 KiB
C++
1189 lines
32 KiB
C++
//
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// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail 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: Advanced server, flex (plain + SSL)
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//
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//------------------------------------------------------------------------------
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#include "example/common/detect_ssl.hpp"
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#include "example/common/server_certificate.hpp"
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#include "example/common/ssl_stream.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/websocket.hpp>
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#include <boost/beast/version.hpp>
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#include <boost/asio/bind_executor.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <boost/asio/ssl/stream.hpp>
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#include <boost/asio/strand.hpp>
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#include <boost/asio/steady_timer.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 <functional>
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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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using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>
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namespace ssl = boost::asio::ssl; // from <boost/asio/ssl.hpp>
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namespace http = boost::beast::http; // from <boost/beast/http.hpp>
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namespace websocket = boost::beast::websocket; // from <boost/beast/websocket.hpp>
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// Return a reasonable mime type based on the extension of a file.
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boost::beast::string_view
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mime_type(boost::beast::string_view path)
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{
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using boost::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 == boost::beast::string_view::npos)
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return boost::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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boost::beast::string_view base,
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boost::beast::string_view path)
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{
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if(base.empty())
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return path.to_string();
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std::string result = base.to_string();
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#if 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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// This function produces an HTTP response for the given
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// request. The type of the response object depends on the
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// contents of the request, so the interface requires the
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// caller to pass a generic lambda for receiving the response.
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template<
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class Body, class Allocator,
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class Send>
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void
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handle_request(
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boost::beast::string_view doc_root,
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http::request<Body, http::basic_fields<Allocator>>&& req,
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Send&& send)
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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](boost::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() = why.to_string();
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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](boost::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 '" + target.to_string() + "' 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](boost::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: '" + what.to_string() + "'";
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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 send(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("..") != boost::beast::string_view::npos)
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return send(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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boost::beast::error_code ec;
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http::file_body::value_type body;
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body.open(path.c_str(), boost::beast::file_mode::scan, ec);
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// Handle the case where the file doesn't exist
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if(ec == boost::system::errc::no_such_file_or_directory)
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return send(not_found(req.target()));
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// Handle an unknown error
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if(ec)
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return send(server_error(ec.message()));
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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(body.size());
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res.keep_alive(req.keep_alive());
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return send(std::move(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(body.size());
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res.keep_alive(req.keep_alive());
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return send(std::move(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(boost::system::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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//------------------------------------------------------------------------------
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// Echoes back all received WebSocket messages.
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// This uses the Curiously Recurring Template Pattern so that
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// the same code works with both SSL streams and regular sockets.
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template<class Derived>
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class websocket_session
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{
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// Access the derived class, this is part of
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// the Curiously Recurring Template Pattern idiom.
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Derived&
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derived()
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{
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return static_cast<Derived&>(*this);
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}
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boost::beast::multi_buffer buffer_;
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protected:
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boost::asio::strand<
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boost::asio::io_context::executor_type> strand_;
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boost::asio::steady_timer timer_;
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public:
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// Construct the session
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explicit
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websocket_session(boost::asio::io_context& ioc)
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: strand_(ioc.get_executor())
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, timer_(ioc,
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(std::chrono::steady_clock::time_point::max)())
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{
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}
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// Start the asynchronous operation
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template<class Body, class Allocator>
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void
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do_accept(http::request<Body, http::basic_fields<Allocator>> req)
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{
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// Set the timer
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timer_.expires_after(std::chrono::seconds(15));
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// Accept the websocket handshake
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derived().ws().async_accept(
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req,
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boost::asio::bind_executor(
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strand_,
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std::bind(
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&websocket_session::on_accept,
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derived().shared_from_this(),
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std::placeholders::_1)));
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}
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// Called when the timer expires.
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void
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on_timer(boost::system::error_code ec)
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{
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if(ec && ec != boost::asio::error::operation_aborted)
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return fail(ec, "timer");
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// Verify that the timer really expired since the deadline may have moved.
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if(timer_.expiry() <= std::chrono::steady_clock::now())
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derived().do_timeout();
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// Wait on the timer
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timer_.async_wait(
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boost::asio::bind_executor(
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strand_,
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std::bind(
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&websocket_session::on_timer,
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derived().shared_from_this(),
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std::placeholders::_1)));
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}
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void
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on_accept(boost::system::error_code ec)
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{
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// Happens when the timer closes the socket
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if(ec == boost::asio::error::operation_aborted)
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return;
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if(ec)
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return fail(ec, "accept");
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// Read a message
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do_read();
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}
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void
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do_read()
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{
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// Set the timer
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timer_.expires_after(std::chrono::seconds(15));
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// Read a message into our buffer
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derived().ws().async_read(
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buffer_,
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boost::asio::bind_executor(
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strand_,
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std::bind(
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&websocket_session::on_read,
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derived().shared_from_this(),
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std::placeholders::_1,
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std::placeholders::_2)));
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}
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void
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on_read(
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boost::system::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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// Happens when the timer closes the socket
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if(ec == boost::asio::error::operation_aborted)
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return;
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// This indicates that the websocket_session was closed
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if(ec == websocket::error::closed)
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return;
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if(ec)
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fail(ec, "read");
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// Echo the message
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derived().ws().text(derived().ws().got_text());
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derived().ws().async_write(
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buffer_.data(),
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boost::asio::bind_executor(
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strand_,
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std::bind(
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&websocket_session::on_write,
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derived().shared_from_this(),
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std::placeholders::_1,
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std::placeholders::_2)));
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}
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void
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on_write(
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boost::system::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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// Happens when the timer closes the socket
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if(ec == boost::asio::error::operation_aborted)
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return;
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if(ec)
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return fail(ec, "write");
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// Clear the buffer
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buffer_.consume(buffer_.size());
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// Do another read
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do_read();
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}
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};
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// Handles a plain WebSocket connection
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class plain_websocket_session
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: public websocket_session<plain_websocket_session>
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, public std::enable_shared_from_this<plain_websocket_session>
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{
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websocket::stream<tcp::socket> ws_;
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bool close_ = false;
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public:
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// Create the session
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explicit
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plain_websocket_session(tcp::socket socket)
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: websocket_session<plain_websocket_session>(
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socket.get_executor().context())
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, ws_(std::move(socket))
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{
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}
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// Called by the base class
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websocket::stream<tcp::socket>&
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ws()
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{
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return ws_;
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}
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// Start the asynchronous operation
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template<class Body, class Allocator>
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void
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run(http::request<Body, http::basic_fields<Allocator>> req)
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{
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// Run the timer. The timer is operated
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// continuously, this simplifies the code.
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on_timer({});
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// Accept the WebSocket upgrade request
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do_accept(std::move(req));
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}
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void
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do_timeout()
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{
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// This is so the close can have a timeout
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if(close_)
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return;
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close_ = true;
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// Set the timer
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timer_.expires_after(std::chrono::seconds(15));
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// Close the WebSocket Connection
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ws_.async_close(
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websocket::close_code::normal,
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boost::asio::bind_executor(
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strand_,
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std::bind(
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&plain_websocket_session::on_close,
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shared_from_this(),
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std::placeholders::_1)));
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}
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void
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on_close(boost::system::error_code ec)
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{
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// Happens when close times out
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if(ec == boost::asio::error::operation_aborted)
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return;
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if(ec)
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return fail(ec, "close");
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// At this point the connection is gracefully closed
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}
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};
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// Handles an SSL WebSocket connection
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class ssl_websocket_session
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: public websocket_session<ssl_websocket_session>
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, public std::enable_shared_from_this<ssl_websocket_session>
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{
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websocket::stream<ssl_stream<tcp::socket>> ws_;
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boost::asio::strand<
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boost::asio::io_context::executor_type> strand_;
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bool eof_ = false;
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public:
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// Create the http_session
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explicit
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ssl_websocket_session(ssl_stream<tcp::socket> stream)
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: websocket_session<ssl_websocket_session>(
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stream.get_executor().context())
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, ws_(std::move(stream))
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, strand_(ws_.get_executor())
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{
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}
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// Called by the base class
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websocket::stream<ssl_stream<tcp::socket>>&
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ws()
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{
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return ws_;
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}
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// Start the asynchronous operation
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template<class Body, class Allocator>
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void
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run(http::request<Body, http::basic_fields<Allocator>> req)
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{
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// Run the timer. The timer is operated
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|
// continuously, this simplifies the code.
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on_timer({});
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// Accept the WebSocket upgrade request
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do_accept(std::move(req));
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}
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void
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do_eof()
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{
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eof_ = true;
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// Set the timer
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timer_.expires_after(std::chrono::seconds(15));
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// Perform the SSL shutdown
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ws_.next_layer().async_shutdown(
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boost::asio::bind_executor(
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strand_,
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std::bind(
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&ssl_websocket_session::on_shutdown,
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shared_from_this(),
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std::placeholders::_1)));
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}
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void
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on_shutdown(boost::system::error_code ec)
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{
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// Happens when the shutdown times out
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if(ec == boost::asio::error::operation_aborted)
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return;
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if(ec)
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return fail(ec, "shutdown");
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// At this point the connection is closed gracefully
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}
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|
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void
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do_timeout()
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{
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// If this is true it means we timed out performing the shutdown
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|
if(eof_)
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return;
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// Start the timer again
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timer_.expires_at(
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(std::chrono::steady_clock::time_point::max)());
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on_timer({});
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do_eof();
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}
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};
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|
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template<class Body, class Allocator>
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void
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make_websocket_session(
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tcp::socket socket,
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http::request<Body, http::basic_fields<Allocator>> req)
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|
{
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|
std::make_shared<plain_websocket_session>(
|
|
std::move(socket))->run(std::move(req));
|
|
}
|
|
|
|
template<class Body, class Allocator>
|
|
void
|
|
make_websocket_session(
|
|
ssl_stream<tcp::socket> stream,
|
|
http::request<Body, http::basic_fields<Allocator>> req)
|
|
{
|
|
std::make_shared<ssl_websocket_session>(
|
|
std::move(stream))->run(std::move(req));
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Handles an HTTP server connection.
|
|
// This uses the Curiously Recurring Template Pattern so that
|
|
// the same code works with both SSL streams and regular sockets.
|
|
template<class Derived>
|
|
class http_session
|
|
{
|
|
// Access the derived class, this is part of
|
|
// the Curiously Recurring Template Pattern idiom.
|
|
Derived&
|
|
derived()
|
|
{
|
|
return static_cast<Derived&>(*this);
|
|
}
|
|
|
|
// This queue is used for HTTP pipelining.
|
|
class queue
|
|
{
|
|
enum
|
|
{
|
|
// Maximum number of responses we will queue
|
|
limit = 8
|
|
};
|
|
|
|
// The type-erased, saved work item
|
|
struct work
|
|
{
|
|
virtual ~work() = default;
|
|
virtual void operator()() = 0;
|
|
};
|
|
|
|
http_session& self_;
|
|
std::vector<std::unique_ptr<work>> items_;
|
|
|
|
public:
|
|
explicit
|
|
queue(http_session& self)
|
|
: self_(self)
|
|
{
|
|
static_assert(limit > 0, "queue limit must be positive");
|
|
items_.reserve(limit);
|
|
}
|
|
|
|
// Returns `true` if we have reached the queue limit
|
|
bool
|
|
is_full() const
|
|
{
|
|
return items_.size() >= limit;
|
|
}
|
|
|
|
// Called when a message finishes sending
|
|
// Returns `true` if the caller should initiate a read
|
|
bool
|
|
on_write()
|
|
{
|
|
BOOST_ASSERT(! items_.empty());
|
|
auto const was_full = is_full();
|
|
items_.erase(items_.begin());
|
|
if(! items_.empty())
|
|
(*items_.front())();
|
|
return was_full;
|
|
}
|
|
|
|
// Called by the HTTP handler to send a response.
|
|
template<bool isRequest, class Body, class Fields>
|
|
void
|
|
operator()(http::message<isRequest, Body, Fields>&& msg)
|
|
{
|
|
// This holds a work item
|
|
struct work_impl : work
|
|
{
|
|
http_session& self_;
|
|
http::message<isRequest, Body, Fields> msg_;
|
|
|
|
work_impl(
|
|
http_session& self,
|
|
http::message<isRequest, Body, Fields>&& msg)
|
|
: self_(self)
|
|
, msg_(std::move(msg))
|
|
{
|
|
}
|
|
|
|
void
|
|
operator()()
|
|
{
|
|
http::async_write(
|
|
self_.derived().stream(),
|
|
msg_,
|
|
boost::asio::bind_executor(
|
|
self_.strand_,
|
|
std::bind(
|
|
&http_session::on_write,
|
|
self_.derived().shared_from_this(),
|
|
std::placeholders::_1,
|
|
msg_.need_eof())));
|
|
}
|
|
};
|
|
|
|
// Allocate and store the work
|
|
items_.emplace_back(new work_impl(self_, std::move(msg)));
|
|
|
|
// If there was no previous work, start this one
|
|
if(items_.size() == 1)
|
|
(*items_.front())();
|
|
}
|
|
};
|
|
|
|
std::string const& doc_root_;
|
|
http::request<http::string_body> req_;
|
|
queue queue_;
|
|
|
|
protected:
|
|
boost::asio::steady_timer timer_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
boost::beast::flat_buffer buffer_;
|
|
|
|
public:
|
|
// Construct the session
|
|
http_session(
|
|
boost::asio::io_context& ioc,
|
|
boost::beast::flat_buffer buffer,
|
|
std::string const& doc_root)
|
|
: doc_root_(doc_root)
|
|
, queue_(*this)
|
|
, timer_(ioc,
|
|
(std::chrono::steady_clock::time_point::max)())
|
|
, strand_(ioc.get_executor())
|
|
, buffer_(std::move(buffer))
|
|
{
|
|
}
|
|
|
|
void
|
|
do_read()
|
|
{
|
|
// Set the timer
|
|
timer_.expires_after(std::chrono::seconds(15));
|
|
|
|
// Read a request
|
|
http::async_read(
|
|
derived().stream(),
|
|
buffer_,
|
|
req_,
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&http_session::on_read,
|
|
derived().shared_from_this(),
|
|
std::placeholders::_1)));
|
|
}
|
|
|
|
// Called when the timer expires.
|
|
void
|
|
on_timer(boost::system::error_code ec)
|
|
{
|
|
if(ec && ec != boost::asio::error::operation_aborted)
|
|
return fail(ec, "timer");
|
|
|
|
// Verify that the timer really expired since the deadline may have moved.
|
|
if(timer_.expiry() <= std::chrono::steady_clock::now())
|
|
return derived().do_timeout();
|
|
|
|
// Wait on the timer
|
|
timer_.async_wait(
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&http_session::on_timer,
|
|
derived().shared_from_this(),
|
|
std::placeholders::_1)));
|
|
}
|
|
|
|
void
|
|
on_read(boost::system::error_code ec)
|
|
{
|
|
// Happens when the timer closes the socket
|
|
if(ec == boost::asio::error::operation_aborted)
|
|
return;
|
|
|
|
// This means they closed the connection
|
|
if(ec == http::error::end_of_stream)
|
|
return derived().do_eof();
|
|
|
|
if(ec)
|
|
return fail(ec, "read");
|
|
|
|
// See if it is a WebSocket Upgrade
|
|
if(websocket::is_upgrade(req_))
|
|
{
|
|
// Transfer the stream to a new WebSocket session
|
|
return make_websocket_session(
|
|
derived().release_stream(),
|
|
std::move(req_));
|
|
}
|
|
|
|
// Send the response
|
|
handle_request(doc_root_, std::move(req_), queue_);
|
|
|
|
// If we aren't at the queue limit, try to pipeline another request
|
|
if(! queue_.is_full())
|
|
do_read();
|
|
}
|
|
|
|
void
|
|
on_write(boost::system::error_code ec, bool close)
|
|
{
|
|
// Happens when the timer closes the socket
|
|
if(ec == boost::asio::error::operation_aborted)
|
|
return;
|
|
|
|
if(ec)
|
|
return fail(ec, "write");
|
|
|
|
if(close)
|
|
{
|
|
// This means we should close the connection, usually because
|
|
// the response indicated the "Connection: close" semantic.
|
|
return derived().do_eof();
|
|
}
|
|
|
|
// Inform the queue that a write completed
|
|
if(queue_.on_write())
|
|
{
|
|
// Read another request
|
|
do_read();
|
|
}
|
|
}
|
|
};
|
|
|
|
// Handles a plain HTTP connection
|
|
class plain_http_session
|
|
: public http_session<plain_http_session>
|
|
, public std::enable_shared_from_this<plain_http_session>
|
|
{
|
|
tcp::socket socket_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
|
|
public:
|
|
// Create the http_session
|
|
plain_http_session(
|
|
tcp::socket socket,
|
|
boost::beast::flat_buffer buffer,
|
|
std::string const& doc_root)
|
|
: http_session<plain_http_session>(
|
|
socket.get_executor().context(),
|
|
std::move(buffer),
|
|
doc_root)
|
|
, socket_(std::move(socket))
|
|
, strand_(socket_.get_executor())
|
|
{
|
|
}
|
|
|
|
// Called by the base class
|
|
tcp::socket&
|
|
stream()
|
|
{
|
|
return socket_;
|
|
}
|
|
|
|
// Called by the base class
|
|
tcp::socket
|
|
release_stream()
|
|
{
|
|
return std::move(socket_);
|
|
}
|
|
|
|
// Start the asynchronous operation
|
|
void
|
|
run()
|
|
{
|
|
// Run the timer. The timer is operated
|
|
// continuously, this simplifies the code.
|
|
on_timer({});
|
|
|
|
do_read();
|
|
}
|
|
|
|
void
|
|
do_eof()
|
|
{
|
|
// Send a TCP shutdown
|
|
boost::system::error_code ec;
|
|
socket_.shutdown(tcp::socket::shutdown_send, ec);
|
|
|
|
// At this point the connection is closed gracefully
|
|
}
|
|
|
|
void
|
|
do_timeout()
|
|
{
|
|
// Closing the socket cancels all outstanding operations. They
|
|
// will complete with boost::asio::error::operation_aborted
|
|
boost::system::error_code ec;
|
|
socket_.shutdown(tcp::socket::shutdown_both, ec);
|
|
socket_.close(ec);
|
|
}
|
|
};
|
|
|
|
// Handles an SSL HTTP connection
|
|
class ssl_http_session
|
|
: public http_session<ssl_http_session>
|
|
, public std::enable_shared_from_this<ssl_http_session>
|
|
{
|
|
ssl_stream<tcp::socket> stream_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
bool eof_ = false;
|
|
|
|
public:
|
|
// Create the http_session
|
|
ssl_http_session(
|
|
tcp::socket socket,
|
|
ssl::context& ctx,
|
|
boost::beast::flat_buffer buffer,
|
|
std::string const& doc_root)
|
|
: http_session<ssl_http_session>(
|
|
socket.get_executor().context(),
|
|
std::move(buffer),
|
|
doc_root)
|
|
, stream_(std::move(socket), ctx)
|
|
, strand_(stream_.get_executor())
|
|
{
|
|
}
|
|
|
|
// Called by the base class
|
|
ssl_stream<tcp::socket>&
|
|
stream()
|
|
{
|
|
return stream_;
|
|
}
|
|
|
|
// Called by the base class
|
|
ssl_stream<tcp::socket>
|
|
release_stream()
|
|
{
|
|
return std::move(stream_);
|
|
}
|
|
|
|
// Start the asynchronous operation
|
|
void
|
|
run()
|
|
{
|
|
// Run the timer. The timer is operated
|
|
// continuously, this simplifies the code.
|
|
on_timer({});
|
|
|
|
// Set the timer
|
|
timer_.expires_after(std::chrono::seconds(15));
|
|
|
|
// Perform the SSL handshake
|
|
// Note, this is the buffered version of the handshake.
|
|
stream_.async_handshake(
|
|
ssl::stream_base::server,
|
|
buffer_.data(),
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&ssl_http_session::on_handshake,
|
|
shared_from_this(),
|
|
std::placeholders::_1,
|
|
std::placeholders::_2)));
|
|
}
|
|
void
|
|
on_handshake(
|
|
boost::system::error_code ec,
|
|
std::size_t bytes_used)
|
|
{
|
|
// Happens when the handshake times out
|
|
if(ec == boost::asio::error::operation_aborted)
|
|
return;
|
|
|
|
if(ec)
|
|
return fail(ec, "handshake");
|
|
|
|
// Consume the portion of the buffer used by the handshake
|
|
buffer_.consume(bytes_used);
|
|
|
|
do_read();
|
|
}
|
|
|
|
void
|
|
do_eof()
|
|
{
|
|
eof_ = true;
|
|
|
|
// Set the timer
|
|
timer_.expires_after(std::chrono::seconds(15));
|
|
|
|
// Perform the SSL shutdown
|
|
stream_.async_shutdown(
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&ssl_http_session::on_shutdown,
|
|
shared_from_this(),
|
|
std::placeholders::_1)));
|
|
}
|
|
|
|
void
|
|
on_shutdown(boost::system::error_code ec)
|
|
{
|
|
// Happens when the shutdown times out
|
|
if(ec == boost::asio::error::operation_aborted)
|
|
return;
|
|
|
|
if(ec)
|
|
return fail(ec, "shutdown");
|
|
|
|
// At this point the connection is closed gracefully
|
|
}
|
|
|
|
void
|
|
do_timeout()
|
|
{
|
|
// If this is true it means we timed out performing the shutdown
|
|
if(eof_)
|
|
return;
|
|
|
|
// Start the timer again
|
|
timer_.expires_at(
|
|
(std::chrono::steady_clock::time_point::max)());
|
|
on_timer({});
|
|
do_eof();
|
|
}
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Detects SSL handshakes
|
|
class detect_session : public std::enable_shared_from_this<detect_session>
|
|
{
|
|
tcp::socket socket_;
|
|
ssl::context& ctx_;
|
|
boost::asio::strand<
|
|
boost::asio::io_context::executor_type> strand_;
|
|
std::string const& doc_root_;
|
|
boost::beast::flat_buffer buffer_;
|
|
|
|
public:
|
|
explicit
|
|
detect_session(
|
|
tcp::socket socket,
|
|
ssl::context& ctx,
|
|
std::string const& doc_root)
|
|
: socket_(std::move(socket))
|
|
, ctx_(ctx)
|
|
, strand_(socket_.get_executor())
|
|
, doc_root_(doc_root)
|
|
{
|
|
}
|
|
|
|
// Launch the detector
|
|
void
|
|
run()
|
|
{
|
|
async_detect_ssl(
|
|
socket_,
|
|
buffer_,
|
|
boost::asio::bind_executor(
|
|
strand_,
|
|
std::bind(
|
|
&detect_session::on_detect,
|
|
shared_from_this(),
|
|
std::placeholders::_1,
|
|
std::placeholders::_2)));
|
|
|
|
}
|
|
|
|
void
|
|
on_detect(boost::system::error_code ec, boost::tribool result)
|
|
{
|
|
if(ec)
|
|
return fail(ec, "detect");
|
|
|
|
if(result)
|
|
{
|
|
// Launch SSL session
|
|
std::make_shared<ssl_http_session>(
|
|
std::move(socket_),
|
|
ctx_,
|
|
std::move(buffer_),
|
|
doc_root_)->run();
|
|
return;
|
|
}
|
|
|
|
// Launch plain session
|
|
std::make_shared<plain_http_session>(
|
|
std::move(socket_),
|
|
std::move(buffer_),
|
|
doc_root_)->run();
|
|
}
|
|
};
|
|
|
|
// Accepts incoming connections and launches the sessions
|
|
class listener : public std::enable_shared_from_this<listener>
|
|
{
|
|
ssl::context& ctx_;
|
|
tcp::acceptor acceptor_;
|
|
tcp::socket socket_;
|
|
std::string const& doc_root_;
|
|
|
|
public:
|
|
listener(
|
|
boost::asio::io_context& ioc,
|
|
ssl::context& ctx,
|
|
tcp::endpoint endpoint,
|
|
std::string const& doc_root)
|
|
: ctx_(ctx)
|
|
, acceptor_(ioc)
|
|
, socket_(ioc)
|
|
, doc_root_(doc_root)
|
|
{
|
|
boost::system::error_code ec;
|
|
|
|
// Open the acceptor
|
|
acceptor_.open(endpoint.protocol(), ec);
|
|
if(ec)
|
|
{
|
|
fail(ec, "open");
|
|
return;
|
|
}
|
|
|
|
// Bind to the server address
|
|
acceptor_.bind(endpoint, ec);
|
|
if(ec)
|
|
{
|
|
fail(ec, "bind");
|
|
return;
|
|
}
|
|
|
|
// Start listening for connections
|
|
acceptor_.listen(
|
|
boost::asio::socket_base::max_listen_connections, ec);
|
|
if(ec)
|
|
{
|
|
fail(ec, "listen");
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Start accepting incoming connections
|
|
void
|
|
run()
|
|
{
|
|
if(! acceptor_.is_open())
|
|
return;
|
|
do_accept();
|
|
}
|
|
|
|
void
|
|
do_accept()
|
|
{
|
|
acceptor_.async_accept(
|
|
socket_,
|
|
std::bind(
|
|
&listener::on_accept,
|
|
shared_from_this(),
|
|
std::placeholders::_1));
|
|
}
|
|
|
|
void
|
|
on_accept(boost::system::error_code ec)
|
|
{
|
|
if(ec)
|
|
{
|
|
fail(ec, "accept");
|
|
}
|
|
else
|
|
{
|
|
// Create the detector http_session and run it
|
|
std::make_shared<detect_session>(
|
|
std::move(socket_),
|
|
ctx_,
|
|
doc_root_)->run();
|
|
}
|
|
|
|
// Accept another connection
|
|
do_accept();
|
|
}
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
// Check command line arguments.
|
|
if (argc != 5)
|
|
{
|
|
std::cerr <<
|
|
"Usage: advanced-server-flex <address> <port> <doc_root> <threads>\n" <<
|
|
"Example:\n" <<
|
|
" advanced-server-flex 0.0.0.0 8080 . 1\n";
|
|
return EXIT_FAILURE;
|
|
}
|
|
auto const address = boost::asio::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 threads = std::max<int>(1, std::atoi(argv[4]));
|
|
|
|
// The io_context is required for all I/O
|
|
boost::asio::io_context ioc{threads};
|
|
|
|
// The SSL context is required, and holds certificates
|
|
ssl::context ctx{ssl::context::sslv23};
|
|
|
|
// 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},
|
|
doc_root)->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;
|
|
}
|