nghttp2/src/asio_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 HTTP_SERVER2_CONNECTION_HPP
#define HTTP_SERVER2_CONNECTION_HPP
#include "nghttp2_config.h"
#include <memory>
#include <boost/asio.hpp>
#include <boost/noncopyable.hpp>
#include <boost/array.hpp>
#include <nghttp2/asio_http2.h>
#include "asio_http2_handler.h"
#include "util.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(request_cb cb, boost::asio::io_service &task_io_service,
SocketArgs &&... args)
: socket_(std::forward<SocketArgs>(args)...), request_cb_(std::move(cb)),
task_io_service_(task_io_service), writing_(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(), task_io_service_, [this]() { do_write(); },
request_cb_);
if (handler_->start() != 0) {
return;
}
do_read();
}
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socket_type &socket() { return socket_; }
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void do_read() {
auto self = this->shared_from_this();
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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) {
if (handler_->on_read(buffer_, bytes_transferred) != 0) {
return;
}
do_write();
if (!writing_ && handler_->should_stop()) {
return;
}
do_read();
}
// 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) {
return;
}
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if (nwrite == 0) {
return;
}
writing_ = true;
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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) {
writing_ = false;
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do_write();
}
});
// 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.
}
private:
socket_type socket_;
request_cb request_cb_;
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boost::asio::io_service &task_io_service_;
std::shared_ptr<http2_handler> handler_;
/// Buffer for incoming data.
boost::array<uint8_t, 8192> buffer_;
boost::array<uint8_t, 16394> outbuf_;
bool writing_;
};
} // namespace server
} // namespace asio_http2
} // namespace nghttp2
#endif // HTTP_SERVER2_CONNECTION_HPP