546 lines
19 KiB
C++
546 lines
19 KiB
C++
#pragma once
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#ifdef CROW_USE_BOOST
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#include <boost/asio.hpp>
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#else
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#ifndef ASIO_STANDALONE
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#define ASIO_STANDALONE
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#endif
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#include <asio.hpp>
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#endif
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#include <algorithm>
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#include <atomic>
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#include <chrono>
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#include <memory>
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#include <vector>
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#include "crow/http_parser_merged.h"
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#include "crow/common.h"
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#include "crow/compression.h"
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#include "crow/http_response.h"
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#include "crow/logging.h"
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#include "crow/middleware.h"
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#include "crow/middleware_context.h"
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#include "crow/parser.h"
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#include "crow/settings.h"
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#include "crow/socket_adaptors.h"
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#include "crow/task_timer.h"
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#include "crow/utility.h"
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namespace crow
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{
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#ifdef CROW_USE_BOOST
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namespace asio = boost::asio;
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using error_code = boost::system::error_code;
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#else
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using error_code = asio::error_code;
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#endif
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using tcp = asio::ip::tcp;
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#ifdef CROW_ENABLE_DEBUG
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static std::atomic<int> connectionCount;
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#endif
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/// An HTTP connection.
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template<typename Adaptor, typename Handler, typename... Middlewares>
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class Connection : public std::enable_shared_from_this<Connection<Adaptor, Handler, Middlewares...>>
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{
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friend struct crow::response;
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public:
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Connection(
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asio::io_context& io_context,
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Handler* handler,
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const std::string& server_name,
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std::tuple<Middlewares...>* middlewares,
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std::function<std::string()>& get_cached_date_str_f,
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detail::task_timer& task_timer,
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typename Adaptor::context* adaptor_ctx_,
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std::atomic<unsigned int>& queue_length):
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adaptor_(io_context, adaptor_ctx_),
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handler_(handler),
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parser_(this),
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req_(parser_.req),
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server_name_(server_name),
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middlewares_(middlewares),
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get_cached_date_str(get_cached_date_str_f),
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task_timer_(task_timer),
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res_stream_threshold_(handler->stream_threshold()),
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queue_length_(queue_length)
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{
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queue_length_++;
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#ifdef CROW_ENABLE_DEBUG
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connectionCount++;
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CROW_LOG_DEBUG << "Connection (" << this << ") allocated, total: " << connectionCount;
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#endif
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}
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~Connection()
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{
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queue_length_--;
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#ifdef CROW_ENABLE_DEBUG
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connectionCount--;
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CROW_LOG_DEBUG << "Connection (" << this << ") freed, total: " << connectionCount;
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#endif
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}
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/// The TCP socket on top of which the connection is established.
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decltype(std::declval<Adaptor>().raw_socket())& socket()
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{
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return adaptor_.raw_socket();
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}
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void start()
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{
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auto self = this->shared_from_this();
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adaptor_.start([self](const error_code& ec) {
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if (!ec)
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{
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self->start_deadline();
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self->parser_.clear();
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self->do_read();
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}
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else
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{
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CROW_LOG_ERROR << "Could not start adaptor: " << ec.message();
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}
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});
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}
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void handle_url()
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{
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routing_handle_result_ = handler_->handle_initial(req_, res);
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// if no route is found for the request method, return the response without parsing or processing anything further.
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if (!routing_handle_result_->rule_index && !routing_handle_result_->catch_all)
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{
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parser_.done();
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need_to_call_after_handlers_ = true;
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complete_request();
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}
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}
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void handle_header()
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{
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// HTTP 1.1 Expect: 100-continue
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if (req_.http_ver_major == 1 && req_.http_ver_minor == 1 && get_header_value(req_.headers, "expect") == "100-continue")
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{
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continue_requested = true;
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buffers_.clear();
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static const std::string expect_100_continue = "HTTP/1.1 100 Continue\r\n\r\n";
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buffers_.emplace_back(expect_100_continue.data(), expect_100_continue.size());
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error_code ec = do_write_sync(buffers_);
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if (ec)
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{
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CROW_LOG_ERROR << ec << " buffer write error happened while handling sending continuation buffer header";
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}
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}
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}
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void handle()
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{
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// TODO(EDev): cancel_deadline_timer should be looked into, it might be a good idea to add it to handle_url() and then restart the timer once everything passes
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cancel_deadline_timer();
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bool is_invalid_request = false;
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add_keep_alive_ = false;
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// Create context
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ctx_ = detail::context<Middlewares...>();
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req_.middleware_context = static_cast<void*>(&ctx_);
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req_.middleware_container = static_cast<void*>(middlewares_);
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req_.io_context = &adaptor_.get_io_context();
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req_.remote_ip_address = adaptor_.address();
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add_keep_alive_ = req_.keep_alive;
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close_connection_ = req_.close_connection;
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if (req_.check_version(1, 1)) // HTTP/1.1
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{
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if (!req_.headers.count("host"))
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{
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is_invalid_request = true;
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res = response(400);
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}
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else if (req_.upgrade)
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{
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// h2 or h2c headers
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if (req_.get_header_value("upgrade").find("h2")==0)
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{
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// TODO(ipkn): HTTP/2
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// currently, ignore upgrade header
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}
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else
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{
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detail::middleware_call_helper<detail::middleware_call_criteria_only_global,
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0, decltype(ctx_), decltype(*middlewares_)>({}, *middlewares_, req_, res, ctx_);
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close_connection_ = true;
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handler_->handle_upgrade(req_, res, std::move(adaptor_));
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return;
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}
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}
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}
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CROW_LOG_INFO << "Request: " << utility::lexical_cast<std::string>(adaptor_.remote_endpoint()) << " " << this << " HTTP/" << (char)(req_.http_ver_major + '0') << "." << (char)(req_.http_ver_minor + '0') << ' ' << method_name(req_.method) << " " << req_.url;
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need_to_call_after_handlers_ = false;
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if (!is_invalid_request)
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{
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res.complete_request_handler_ = nullptr;
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auto self = this->shared_from_this();
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res.is_alive_helper_ = [self]() -> bool {
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return self->adaptor_.is_open();
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};
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detail::middleware_call_helper<detail::middleware_call_criteria_only_global,
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0, decltype(ctx_), decltype(*middlewares_)>({}, *middlewares_, req_, res, ctx_);
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if (!res.completed_)
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{
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res.complete_request_handler_ = [self] {
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self->complete_request();
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};
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need_to_call_after_handlers_ = true;
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handler_->handle(req_, res, routing_handle_result_);
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if (add_keep_alive_)
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res.set_header("connection", "Keep-Alive");
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}
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else
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{
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complete_request();
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}
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}
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else
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{
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complete_request();
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}
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}
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/// Call the after handle middleware and send the write the response to the connection.
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void complete_request()
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{
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CROW_LOG_INFO << "Response: " << this << ' ' << req_.raw_url << ' ' << res.code << ' ' << close_connection_;
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res.is_alive_helper_ = nullptr;
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if (need_to_call_after_handlers_)
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{
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need_to_call_after_handlers_ = false;
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// call all after_handler of middlewares
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detail::after_handlers_call_helper<
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detail::middleware_call_criteria_only_global,
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(static_cast<int>(sizeof...(Middlewares)) - 1),
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decltype(ctx_),
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decltype(*middlewares_)>({}, *middlewares_, ctx_, req_, res);
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}
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#ifdef CROW_ENABLE_COMPRESSION
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if (!res.body.empty() && handler_->compression_used())
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{
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std::string accept_encoding = req_.get_header_value("Accept-Encoding");
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if (!accept_encoding.empty() && res.compressed)
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{
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switch (handler_->compression_algorithm())
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{
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case compression::DEFLATE:
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if (accept_encoding.find("deflate") != std::string::npos)
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{
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res.body = compression::compress_string(res.body, compression::algorithm::DEFLATE);
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res.set_header("Content-Encoding", "deflate");
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}
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break;
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case compression::GZIP:
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if (accept_encoding.find("gzip") != std::string::npos)
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{
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res.body = compression::compress_string(res.body, compression::algorithm::GZIP);
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res.set_header("Content-Encoding", "gzip");
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}
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break;
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default:
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break;
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}
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}
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}
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#endif
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prepare_buffers();
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if (res.is_static_type())
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{
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do_write_static();
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}
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else
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{
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do_write_general();
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}
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}
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private:
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void prepare_buffers()
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{
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res.complete_request_handler_ = nullptr;
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res.is_alive_helper_ = nullptr;
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if (!adaptor_.is_open())
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{
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//CROW_LOG_DEBUG << this << " delete (socket is closed) " << is_reading << ' ' << is_writing;
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//delete this;
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return;
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}
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res.write_header_into_buffer(buffers_, content_length_, add_keep_alive_, server_name_);
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}
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void do_write_static()
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{
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asio::write(adaptor_.socket(), buffers_);
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if (res.file_info.statResult == 0)
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{
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std::ifstream is(res.file_info.path.c_str(), std::ios::in | std::ios::binary);
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std::vector<asio::const_buffer> buffers{1};
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char buf[16384];
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is.read(buf, sizeof(buf));
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while (is.gcount() > 0)
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{
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buffers[0] = asio::buffer(buf, is.gcount());
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error_code ec = do_write_sync(buffers);
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if (ec) {
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CROW_LOG_ERROR << ec << " - buffer write error happened while sending content of file "
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<< res.file_info.path << ". Writing stopped premature.";
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break;
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}
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is.read(buf, sizeof(buf));
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}
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}
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if (close_connection_)
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{
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adaptor_.shutdown_readwrite();
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adaptor_.close();
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CROW_LOG_DEBUG << this << " from write (static)";
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}
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res.end();
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res.clear();
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buffers_.clear();
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parser_.clear();
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}
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void do_write_general()
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{
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error_code ec;
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if (res.body.length() < res_stream_threshold_)
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{
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res_body_copy_.swap(res.body);
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buffers_.emplace_back(res_body_copy_.data(), res_body_copy_.size());
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ec = do_write_sync(buffers_);
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if (ec) {
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CROW_LOG_ERROR << ec << " - buffer write error happened while sending response. Writing stopped premature.";
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}
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if (need_to_start_read_after_complete_)
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{
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need_to_start_read_after_complete_ = false;
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start_deadline();
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do_read();
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}
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}
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else
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{
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asio::write(adaptor_.socket(), buffers_,ec); // Write the response start / headers
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if (ec) {
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CROW_LOG_ERROR << ec << "- buffer write error happened while sending response start / headers. Writing stopped premature.";
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}
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cancel_deadline_timer();
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if (res.body.length() > 0)
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{
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std::vector<asio::const_buffer> buffers{1};
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const uint8_t* data = reinterpret_cast<const uint8_t*>(res.body.data());
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size_t length = res.body.length();
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for (size_t transferred = 0; transferred < length;)
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{
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size_t to_transfer = CROW_MIN(16384UL, length - transferred);
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buffers[0] = asio::const_buffer(data + transferred, to_transfer);
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ec = do_write_sync(buffers);
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if (ec) {
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CROW_LOG_ERROR << ec << " - " << transferred << " - buffer write error happened while sending response. Writing stopped premature.";
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break;
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}
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transferred += to_transfer;
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}
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}
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if (close_connection_)
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{
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adaptor_.shutdown_readwrite();
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adaptor_.close();
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CROW_LOG_DEBUG << this << " from write (res_stream)";
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}
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res.end();
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res.clear();
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buffers_.clear();
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parser_.clear();
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}
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}
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void do_read()
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{
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auto self = this->shared_from_this();
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adaptor_.socket().async_read_some(
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asio::buffer(buffer_),
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[self](const error_code& ec, std::size_t bytes_transferred) {
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bool error_while_reading = true;
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if (!ec)
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{
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bool ret = self->parser_.feed(self->buffer_.data(), bytes_transferred);
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if (ret && self->adaptor_.is_open())
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{
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error_while_reading = false;
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}
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}
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if (error_while_reading)
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{
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self->cancel_deadline_timer();
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self->parser_.done();
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self->adaptor_.shutdown_read();
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self->adaptor_.close();
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CROW_LOG_DEBUG << self << " from read(1) with description: \"" << http_errno_description(static_cast<http_errno>(self->parser_.http_errno)) << '\"';
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}
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else if (self->close_connection_)
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{
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self->cancel_deadline_timer();
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self->parser_.done();
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// adaptor will close after write
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}
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else if (!self->need_to_call_after_handlers_)
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{
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self->start_deadline();
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self->do_read();
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}
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else
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{
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// res will be completed later by user
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self->need_to_start_read_after_complete_ = true;
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}
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});
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}
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void do_write()
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{
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auto self = this->shared_from_this();
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asio::async_write(
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adaptor_.socket(), buffers_,
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[self](const error_code& ec, std::size_t /*bytes_transferred*/) {
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self->res.clear();
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self->res_body_copy_.clear();
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if (!self->continue_requested)
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{
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self->parser_.clear();
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}
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else
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{
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self->continue_requested = false;
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}
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if (!ec)
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{
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if (self->close_connection_)
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{
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self->adaptor_.shutdown_write();
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self->adaptor_.close();
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CROW_LOG_DEBUG << self << " from write(1)";
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}
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}
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else
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{
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CROW_LOG_DEBUG << self << " from write(2)";
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}
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});
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}
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inline error_code do_write_sync(std::vector<asio::const_buffer>& buffers)
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{
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error_code ec;
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asio::write(adaptor_.socket(), buffers, ec);
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if (ec)
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{
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// CROW_LOG_ERROR << ec << " - happened while sending buffers";
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CROW_LOG_DEBUG << this << " from write (sync)(2)";
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}
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this->res.clear();
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this->res_body_copy_.clear();
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if (this->continue_requested)
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{
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this->continue_requested = false;
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}
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else
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{
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this->parser_.clear();
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}
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return ec;
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}
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void cancel_deadline_timer()
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{
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CROW_LOG_DEBUG << this << " timer cancelled: " << &task_timer_ << ' ' << task_id_;
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task_timer_.cancel(task_id_);
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}
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void start_deadline(/*int timeout = 5*/)
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{
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cancel_deadline_timer();
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auto self = this->shared_from_this();
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task_id_ = task_timer_.schedule([self] {
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if (!self->adaptor_.is_open())
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{
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return;
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}
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self->adaptor_.shutdown_readwrite();
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self->adaptor_.close();
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});
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CROW_LOG_DEBUG << this << " timer added: " << &task_timer_ << ' ' << task_id_;
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}
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private:
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Adaptor adaptor_;
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Handler* handler_;
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std::array<char, 4096> buffer_;
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HTTPParser<Connection> parser_;
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std::unique_ptr<routing_handle_result> routing_handle_result_;
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request& req_;
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response res;
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bool close_connection_ = false;
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const std::string& server_name_;
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std::vector<asio::const_buffer> buffers_;
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std::string content_length_;
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std::string date_str_;
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std::string res_body_copy_;
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detail::task_timer::identifier_type task_id_{};
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bool continue_requested{};
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bool need_to_call_after_handlers_{};
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bool need_to_start_read_after_complete_{};
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bool add_keep_alive_{};
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std::tuple<Middlewares...>* middlewares_;
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detail::context<Middlewares...> ctx_;
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std::function<std::string()>& get_cached_date_str;
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detail::task_timer& task_timer_;
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size_t res_stream_threshold_;
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std::atomic<unsigned int>& queue_length_;
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};
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} // namespace crow
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