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/*
Copyright (c) 2009-2012 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __XS_STREAM_ENGINE_HPP_INCLUDED__
#define __XS_STREAM_ENGINE_HPP_INCLUDED__
#include <stddef.h>
#include "fd.hpp"
#include "i_engine.hpp"
#include "io_object.hpp"
#include "encoder.hpp"
#include "decoder.hpp"
#include "options.hpp"
#include "wire.hpp"
namespace xs
{
class io_thread_t;
class session_base_t;
// This engine handles any socket with SOCK_STREAM semantics,
// e.g. TCP socket or an UNIX domain socket.
class stream_engine_t : public io_object_t, public i_engine
{
public:
stream_engine_t (fd_t fd_, const options_t &options_);
~stream_engine_t ();
// i_engine interface implementation.
void plug (xs::io_thread_t *io_thread_,
xs::session_base_t *session_);
void unplug ();
void terminate ();
void activate_in ();
void activate_out ();
// i_poll_events interface implementation.
void in_event (fd_t fd_);
void out_event (fd_t fd_);
private:
// Function to handle network disconnections.
void error ();
// Writes data to the socket. Returns the number of bytes actually
// written (even zero is to be considered to be a success). In case
// of error or orderly shutdown by the other peer -1 is returned.
int write (const void *data_, size_t size_);
// Reads data from the socket (up to 'size' bytes). Returns the number
// of bytes actually read (even zero is to be considered to be
// a success). In case of error or orderly shutdown by the other
// peer -1 is returned.
int read (void *data_, size_t size_);
// Underlying socket.
fd_t s;
handle_t handle;
unsigned char *inpos;
size_t insize;
decoder_t decoder;
unsigned char *outpos;
size_t outsize;
encoder_t encoder;
// The session this engine is attached to.
xs::session_base_t *session;
// Detached transient session.
xs::session_base_t *leftover_session;
options_t options;
bool plugged;
// Outgoing protocol header.
sp_header_t out_header;
// Desired protocol header.
sp_header_t desired_header;
// Incoming protocol header.
sp_header_t in_header;
unsigned char *header_pos;
size_t header_remaining;
// Protocol header has been received/sent.
bool header_received;
bool header_sent;
stream_engine_t (const stream_engine_t&);
const stream_engine_t &operator = (const stream_engine_t&);
};
}
#endif
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