nghttp2/src/asio_server_connection.h

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2014 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// We wrote this code based on the original code which has the
// following license:
//
// connection.hpp
// ~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_SERVER_CONNECTION_H
#define ASIO_SERVER_CONNECTION_H
#include "nghttp2_config.h"
#include <memory>
#include <boost/noncopyable.hpp>
#include <boost/array.hpp>
#include <nghttp2/asio_http2_server.h>
#include "asio_server_http2_handler.h"
#include "asio_server_serve_mux.h"
#include "util.h"
#include "template.h"
namespace nghttp2 {
namespace asio_http2 {
namespace server {
/// Represents a single connection from a client.
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template <typename socket_type>
class connection : public std::enable_shared_from_this<connection<socket_type>>,
private boost::noncopyable {
public:
/// Construct a connection with the given io_service.
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template <typename... SocketArgs>
explicit connection(
serve_mux &mux,
const boost::posix_time::time_duration &tls_handshake_timeout,
const boost::posix_time::time_duration &read_timeout,
SocketArgs &&... args)
: socket_(std::forward<SocketArgs>(args)...), mux_(mux),
deadline_(socket_.get_io_service()),
tls_handshake_timeout_(tls_handshake_timeout),
read_timeout_(read_timeout), writing_(false), stopped_(false) {}
/// Start the first asynchronous operation for the connection.
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void start() {
handler_ = std::make_shared<http2_handler>(
socket_.get_io_service(), socket_.lowest_layer().remote_endpoint(),
[this]() { do_write(); }, mux_);
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if (handler_->start() != 0) {
stop();
return;
}
do_read();
}
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socket_type &socket() { return socket_; }
void start_tls_handshake_deadline() {
deadline_.expires_from_now(tls_handshake_timeout_);
deadline_.async_wait(
std::bind(&connection::handle_deadline, this->shared_from_this()));
}
void start_read_deadline() {
deadline_.expires_from_now(read_timeout_);
deadline_.async_wait(
std::bind(&connection::handle_deadline, this->shared_from_this()));
}
void handle_deadline() {
if (stopped_) {
return;
}
if (deadline_.expires_at() <=
boost::asio::deadline_timer::traits_type::now()) {
stop();
deadline_.expires_at(boost::posix_time::pos_infin);
return;
}
deadline_.async_wait(
std::bind(&connection::handle_deadline, this->shared_from_this()));
}
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void do_read() {
auto self = this->shared_from_this();
deadline_.expires_from_now(read_timeout_);
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socket_.async_read_some(
boost::asio::buffer(buffer_),
[this, self](const boost::system::error_code &e,
std::size_t bytes_transferred) {
if (e) {
stop();
return;
}
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if (handler_->on_read(buffer_, bytes_transferred) != 0) {
stop();
return;
}
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do_write();
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if (!writing_ && handler_->should_stop()) {
stop();
return;
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}
do_read();
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// If an error occurs then no new asynchronous operations are
// started. This means that all shared_ptr references to the
// connection object will disappear and the object will be
// destroyed automatically after this handler returns. The
// connection class's destructor closes the socket.
});
}
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void do_write() {
auto self = this->shared_from_this();
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if (writing_) {
return;
}
int rv;
std::size_t nwrite;
rv = handler_->on_write(outbuf_, nwrite);
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if (rv != 0) {
stop();
return;
}
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if (nwrite == 0) {
if (handler_->should_stop()) {
stop();
}
return;
}
writing_ = true;
// Reset read deadline here, because normally client is sending
// something, it does not expect timeout while doing it.
deadline_.expires_from_now(read_timeout_);
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boost::asio::async_write(
socket_, boost::asio::buffer(outbuf_, nwrite),
[this, self](const boost::system::error_code &e, std::size_t) {
if (e) {
stop();
return;
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}
writing_ = false;
do_write();
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});
// No new asynchronous operations are started. This means that all
// shared_ptr references to the connection object will disappear and
// the object will be destroyed automatically after this handler
// returns. The connection class's destructor closes the socket.
}
void stop() {
if (stopped_) {
return;
}
stopped_ = true;
boost::system::error_code ignored_ec;
socket_.lowest_layer().close(ignored_ec);
deadline_.cancel();
}
private:
socket_type socket_;
serve_mux &mux_;
std::shared_ptr<http2_handler> handler_;
/// Buffer for incoming data.
boost::array<uint8_t, 8_k> buffer_;
boost::array<uint8_t, 64_k> outbuf_;
boost::asio::deadline_timer deadline_;
boost::posix_time::time_duration tls_handshake_timeout_;
boost::posix_time::time_duration read_timeout_;
bool writing_;
bool stopped_;
};
} // namespace server
} // namespace asio_http2
} // namespace nghttp2
#endif // ASIO_SERVER_CONNECTION_H