web_peer_connection.hpp

LINUX下

/*

Copyright (c) 2003, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in
      the documentation and/or other materials provided with the distribution.
    * Neither the name of the author nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

*/

#ifndef TORRENT_WEB_PEER_CONNECTION_HPP_INCLUDED
#define TORRENT_WEB_PEER_CONNECTION_HPP_INCLUDED

#include <ctime>
#include <algorithm>
#include <vector>
#include <deque>
#include <string>

#include "libtorrent/debug.hpp"

#ifdef _MSC_VER
#pragma warning(push, 1)
#endif

#include <boost/smart_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/noncopyable.hpp>
#include <boost/array.hpp>
#include <boost/optional.hpp>
#include <boost/cstdint.hpp>

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#include "libtorrent/buffer.hpp"
#include "libtorrent/peer_connection.hpp"
#include "libtorrent/socket.hpp"
#include "libtorrent/peer_id.hpp"
#include "libtorrent/storage.hpp"
#include "libtorrent/stat.hpp"
#include "libtorrent/alert.hpp"
#include "libtorrent/torrent_handle.hpp"
#include "libtorrent/torrent.hpp"
#include "libtorrent/peer_request.hpp"
#include "libtorrent/piece_block_progress.hpp"
#include "libtorrent/config.hpp"
// parse_url
#include "libtorrent/tracker_manager.hpp"
// http_parser
#include "libtorrent/http_tracker_connection.hpp"

namespace libtorrent
{
	class torrent;

	namespace detail
	{
		struct session_impl;
	}

	class TORRENT_EXPORT web_peer_connection
		: public peer_connection
	{
	friend class invariant_access;
	public:

		// this is the constructor where the we are the active part.
		// The peer_conenction should handshake and verify that the
		// other end has the correct id
		web_peer_connection(
			aux::session_impl& ses
			, boost::weak_ptr<torrent> t
			, boost::shared_ptr<socket_type> s
			, tcp::endpoint const& remote
			, std::string const& url
			, policy::peer* peerinfo);

		~web_peer_connection();

		// called from the main loop when this connection has any
		// work to do.
		void on_sent(asio::error_code const& error
			, std::size_t bytes_transferred);
		void on_receive(asio::error_code const& error
			, std::size_t bytes_transferred);
			
		std::string const& url() const { return m_url; }
		
		virtual void get_specific_peer_info(peer_info& p) const;
		virtual bool in_handshake() const;

		// the following functions appends messages
		// to the send buffer
		void write_choke() {}
		void write_unchoke() {}
		void write_interested() {}
		void write_not_interested() {}
		void write_request(peer_request const& r);
		void write_cancel(peer_request const& r)
		{ incoming_reject_request(r); }
		void write_have(int index) {}
		void write_piece(peer_request const& r, char* buffer) { TORRENT_ASSERT(false); }
		void write_keepalive() {}
		void on_connected();
		void write_reject_request(peer_request const&) {}
		void write_allow_fast(int) {}

#ifndef NDEBUG
		void check_invariant() const;
#endif

	private:

		// returns the block currently being
		// downloaded. And the progress of that
		// block. If the peer isn't downloading
		// a piece for the moment, the boost::optional
		// will be invalid.
		boost::optional<piece_block_progress> downloading_piece_progress() const;

		// this has one entry per bittorrent request
		std::deque<peer_request> m_requests;
		// this has one entry per http-request
		// (might be more than the bt requests)
		std::deque<int> m_file_requests;

		std::string m_server_string;
		http_parser m_parser;
		std::string m_auth;
		std::string m_host;
		int m_port;
		std::string m_path;
		std::string m_url;
			
		// the first request will contain a little bit more data
		// than subsequent ones, things that aren't critical are left
		// out to save bandwidth.
		bool m_first_request;
		
		// this is used for intermediate storage of pieces
		// that is received in more than on HTTP responses
		std::vector<char> m_piece;
		// the mapping of the data in the m_piece buffer
		peer_request m_intermediate_piece;
		
		// the number of bytes into the receive buffer where
		// current read cursor is.
		int m_body_start;
		// the number of bytes received in the current HTTP
		// response. used to know where in the buffer the
		// next response starts
		int m_received_body;
	};
}

#endif // TORRENT_WEB_PEER_CONNECTION_HPP_INCLUDED