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/*
This file is part of GNUnet.
Copyright (C) 2009, 2010, 2011 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file dht/gnunet-service-dht_nse.c
* @brief GNUnet DHT integration with NSE
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_nse_service.h"
#include "gnunet-service-dht.h"
#include "gnunet-service-dht_nse.h"
/**
* log of the current network size estimate, used as the point where
* we switch between random and deterministic routing. Default
* value of 4.0 is used if NSE module is not available (i.e. not
* configured).
*/
static double log_of_network_size_estimate = 4.0;
/**
* Network size estimation handle.
*/
static struct GNUNET_NSE_Handle *nse;
/**
* Callback that is called 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
*
*/
static void
update_network_size_estimate (void *cls, struct GNUNET_TIME_Absolute timestamp,
double logestimate, double std_dev)
{
GNUNET_STATISTICS_update (GDS_stats,
gettext_noop ("# Network size estimates received"),
1, GNUNET_NO);
/* do not allow estimates < 0.5 */
log_of_network_size_estimate = GNUNET_MAX (0.5, logestimate);
}
/**
* Return the log of the current network size estimate.
*
* @return log of NSE
*/
double
GDS_NSE_get ()
{
return log_of_network_size_estimate;
}
/**
* Initialize NSE subsystem.
*/
void
GDS_NSE_init ()
{
unsigned long long hops;
if ( (GNUNET_YES ==
GNUNET_CONFIGURATION_have_value (GDS_cfg,
"dht",
"FORCE_NSE")) &&
(GNUNET_OK ==
GNUNET_CONFIGURATION_get_value_number (GDS_cfg,
"dht",
"FORCE_NSE",
&hops)) )
{
log_of_network_size_estimate = (double) hops;
return;
}
nse = GNUNET_NSE_connect (GDS_cfg, &update_network_size_estimate, NULL);
}
/**
* Shutdown NSE subsystem.
*/
void
GDS_NSE_done ()
{
if (NULL != nse)
{
GNUNET_NSE_disconnect (nse);
nse = NULL;
}
}
/* end of gnunet-service-dht_nse.c */
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