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/*
This file is part of GNUnet
(C) 2009, 2010 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 2, 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.
*/
#ifndef GNUNET_NSE_SERVICE_H_
#define GNUNET_NSE_SERVICE_H_
/**
* @file include/gnunet_nse_service.h
* @brief API to retrieve the current network size estimate,
* also to register for notifications whenever a new
* network size estimate is calculated.
*
* @author Nathan Evans
*/
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_common.h"
#include "gnunet_configuration_lib.h"
#include "gnunet_scheduler_lib.h"
/**
* Version of the network size estimation API.
*/
#define GNUNET_NSE_VERSION 0x00000000
/**
* Interval for sending network size estimation flood requests.
* Number is in milliseconds.
* This needs to be a factor of the number milliseconds in
* a day, as the base time used is midnight each day offset
* by this amount.
*
* There are 86400000 milliseconds in a day.
*/
/*#define GNUNET_NSE_INTERVAL 360000*/ /* Every six minutes */
#define GNUNET_NSE_INTERVAL 30000 /* Every minute */
/**
* How much clock skew (in milliseconds) will we allow
* for received messages. We check our current time
* with the timestamp received as part of the message
* and if the difference is greater than this tolerance
* we will discard the message as invalid.
*
* There are 86400000 milliseconds in a day.
*/
#define GNUNET_NSE_DRIFT_TOLERANCE 600000 /* Ten minutes. */
/**
* Number of bits
*/
#define GNUNET_NSE_BITS
/**
* Handle for the network size estimation service.
*/
struct GNUNET_NSE_Handle;
/**
* Callback to call when network size estimate is updated.
*
* @param cls closure
* @param estimate the value of the current network size estimate
* @param std_dev standard deviation (rounded down to nearest integer)
* of the size estimation values seen
*
*/
typedef void
(*GNUNET_NSE_Callback) (void *cls, double estimate, double std_dev);
/**
* Connect to the network size estimation service.
*
* @param cfg the configuration to use
* @param func funtion to call with network size estimate
* @param func_cls closure to pass for network size estimate callback
*
* @return handle to use
*/
struct GNUNET_NSE_Handle *
GNUNET_NSE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
GNUNET_NSE_Callback func, void *func_cls);
/**
* Disconnect from network size estimation service
*
* @param h handle to destroy
*
*/
void
GNUNET_NSE_disconnect (struct GNUNET_NSE_Handle *h);
#if 0 /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif
#endif /* GNUNET_NSE_SERVICE_H_ */
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