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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/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @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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