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/*
This file is part of GNUnet
(C) 2009, 2011 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file include/gnunet_fragmentation_lib.h
* @brief library to help fragment messages
* @author Christian Grothoff
*
* TODO: consider additional flow-control for sending from
* fragmentation based on continuations.
*/
#ifndef GNUNET_FRAGMENTATION_LIB_H
#define GNUNET_FRAGMENTATION_LIB_H
#include "gnunet_util_lib.h"
#include "gnunet_bandwidth_lib.h"
#include "gnunet_statistics_service.h"
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
/**
* Fragmentation context.
*/
struct GNUNET_FRAGMENT_Context;
/**
* Function that is called with messages created by the fragmentation
* module. In the case of the 'proc' callback of the
* GNUNET_FRAGMENT_context_create function, this function must
* eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
*
* @param cls closure
* @param msg the message that was created
*/
typedef void (*GNUNET_FRAGMENT_MessageProcessor) (void *cls,
const struct
GNUNET_MessageHeader * msg);
/**
* Create a fragmentation context for the given message.
* Fragments the message into fragments of size "mtu" or
* less. Calls 'proc' on each un-acknowledged fragment,
* using both the expected 'delay' between messages and
* acknowledgements and the given 'tracker' to guide the
* frequency of calls to 'proc'.
*
* @param stats statistics context
* @param mtu the maximum message size for each fragment
* @param tracker bandwidth tracker to use for flow control (can be NULL)
* @param delay expected delay between fragment transmission
* and ACK based on previous messages
* @param msg the message to fragment
* @param proc function to call for each fragment to transmit
* @param proc_cls closure for proc
* @return the fragmentation context
*/
struct GNUNET_FRAGMENT_Context *
GNUNET_FRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
uint16_t mtu,
struct GNUNET_BANDWIDTH_Tracker *tracker,
struct GNUNET_TIME_Relative delay,
const struct GNUNET_MessageHeader *msg,
GNUNET_FRAGMENT_MessageProcessor proc,
void *proc_cls);
/**
* Continuation to call from the 'proc' function after the fragment
* has been transmitted (and hence the next fragment can now be
* given to proc).
*
* @param fc fragmentation context
*/
void
GNUNET_FRAGMENT_context_transmission_done (struct GNUNET_FRAGMENT_Context *fc);
/**
* Process an acknowledgement message we got from the other
* side (to control re-transmits).
*
* @param fc fragmentation context
* @param msg acknowledgement message we received
* @return GNUNET_OK if this ack completes the work of the 'fc'
* (all fragments have been received);
* GNUNET_NO if more messages are pending
* GNUNET_SYSERR if this ack is not valid for this fc
*/
int
GNUNET_FRAGMENT_process_ack (struct GNUNET_FRAGMENT_Context *fc,
const struct GNUNET_MessageHeader *msg);
/**
* Destroy the given fragmentation context (stop calling 'proc', free
* resources).
*
* @param fc fragmentation context
* @return average delay between transmission and ACK for the
* last message, FOREVER if the message was not fully transmitted
*/
struct GNUNET_TIME_Relative
GNUNET_FRAGMENT_context_destroy (struct GNUNET_FRAGMENT_Context *fc);
/**
* Defragmentation context (one per connection).
*/
struct GNUNET_DEFRAGMENT_Context;
/**
* Function that is called with acknowledgement messages created by
* the fragmentation module. Acknowledgements are cummulative,
* so it is OK to only transmit the 'latest' ack message for the same
* message ID.
*
* @param cls closure
* @param id unique message ID (modulo collisions)
* @param msg the message that was created
*/
typedef void (*GNUNET_DEFRAGMENT_AckProcessor) (void *cls, uint32_t id,
const struct
GNUNET_MessageHeader * msg);
/**
* Create a defragmentation context.
*
* @param stats statistics context
* @param mtu the maximum message size for each fragment
* @param num_msgs how many fragmented messages
* to we defragment at most at the same time?
* @param cls closure for proc and ackp
* @param proc function to call with defragmented messages
* @param ackp function to call with acknowledgements (to send
* back to the other side)
* @return the defragmentation context
*/
struct GNUNET_DEFRAGMENT_Context *
GNUNET_DEFRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
uint16_t mtu, unsigned int num_msgs,
void *cls,
GNUNET_FRAGMENT_MessageProcessor proc,
GNUNET_DEFRAGMENT_AckProcessor ackp);
/**
* Destroy the given defragmentation context.
*
* @param dc defragmentation context
*/
void
GNUNET_DEFRAGMENT_context_destroy (struct GNUNET_DEFRAGMENT_Context *dc);
/**
* We have received a fragment. Process it.
*
* @param dc the context
* @param msg the message that was received
* @return GNUNET_OK on success, GNUNET_NO if this was a duplicate, GNUNET_SYSERR on error
*/
int
GNUNET_DEFRAGMENT_process_fragment (struct GNUNET_DEFRAGMENT_Context *dc,
const struct GNUNET_MessageHeader *msg);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
/* end of gnunet_fragmentation_lib.h */
#endif
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