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/*
This file is part of GNUnet
Copyright (C) 2011 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef GNUNET_NSE_SERVICE_H_
#define GNUNET_NSE_SERVICE_H_
/**
* @author Nathan Evans
*
* @file
* API to retrieve the current network size estimate
*
* @defgroup nse NSE service
* Network Size Estimation
*
* Provides an API to retrieve the current network size estimate,
* also to register for notifications whenever a new
* network size estimate is calculated.
*
* @see [Documentation](https://gnunet.org/gnunet-nse-subsystem)
*
* @{
*/
#ifdef __cplusplus
extern "C"
{
#if 0 /* keep Emacsens' auto-indent happy */
}
#endif
#endif
#include "gnunet_util_lib.h"
/**
* Version of the network size estimation API.
*/
#define GNUNET_NSE_VERSION 0x00000000
/**
* Handle for the network size estimation service.
*/
struct GNUNET_NSE_Handle;
/**
* Callback to call when network size estimate is updated.
*
* @param cls closure
* @param timestamp time when the estimate was received from the server (or created by the server)
* @param logestimate the log(Base 2) value of the current network size estimate
* @param std_dev standard deviation for the estimate
*
*/
typedef void (*GNUNET_NSE_Callback) (void *cls,
struct GNUNET_TIME_Absolute timestamp,
double logestimate, double std_dev);
/**
* Convert the logarithmic estimated returned to the 'GNUNET_NSE_Callback'
* into an absolute estimate in terms of the number of peers in the network.
*
* @param loge logarithmic estimate
* @return absolute number of peers in the network (estimated)
*/
#define GNUNET_NSE_log_estimate_to_n(loge) pow(2.0, (loge))
/**
* 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 to @a func
* @return handle to use in #GNUNET_NSE_disconnect to stop NSE from invoking the callbacks
*/
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
/** @} */ /* end of group nse */
#endif /* GNUNET_NSE_SERVICE_H_ */
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