gnunet-service-ats_reservations.c

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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 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
 */
#include "platform.h"
#include "gnunet-service-ats_reservations.h"
#include "gnunet-service-ats.h"
#include "ats.h"
 
#define MAX_BANDWIDTH_CARRY_S 5
 
 
static struct GNUNET_CONTAINER_MultiPeerMap *trackers;
 
 
static struct GNUNET_TIME_Relative
reservations_reserve (const struct GNUNET_PeerIdentity *peer,
                      int32_t amount)
{
  struct GNUNET_BANDWIDTH_Tracker *tracker;
  struct GNUNET_TIME_Relative ret;
 
  tracker = GNUNET_CONTAINER_multipeermap_get (trackers,
                                               peer);
  if (NULL == tracker)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Not connected, allowing reservation of %d bytes\n",
                (int) amount);
    return GNUNET_TIME_UNIT_ZERO;       /* not connected, satisfy now */
  }
  if (amount >= 0)
  {
    ret = GNUNET_BANDWIDTH_tracker_get_delay (tracker, amount);
    if (ret.rel_value_us > 0)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Delay to satisfy reservation for %d bytes is %s\n",
                  (int) amount,
                  GNUNET_STRINGS_relative_time_to_string (ret,
                                                          GNUNET_YES));
      return ret;
    }
  }
  (void) GNUNET_BANDWIDTH_tracker_consume (tracker, amount);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Reserved %d bytes\n",
              (int) amount);
  return GNUNET_TIME_UNIT_ZERO;
}
 
 
void
GAS_reservations_set_bandwidth (const struct GNUNET_PeerIdentity *peer,
                                struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
{
  struct GNUNET_BANDWIDTH_Tracker *tracker;
 
  tracker = GNUNET_CONTAINER_multipeermap_get (trackers, peer);
  if (0 == ntohl (bandwidth_in.value__))
  {
    if (NULL == tracker)
      return;
    GNUNET_assert (GNUNET_YES ==
                   GNUNET_CONTAINER_multipeermap_remove (trackers,
                                                         peer,
                                                         tracker));
    GNUNET_free (tracker);
    return;
  }
  if (NULL == tracker)
  {
    tracker = GNUNET_new (struct GNUNET_BANDWIDTH_Tracker);
    GNUNET_BANDWIDTH_tracker_init (tracker,
                                   NULL,
                                   NULL,
                                   bandwidth_in,
                                   MAX_BANDWIDTH_CARRY_S);
    GNUNET_assert (GNUNET_OK ==
                   GNUNET_CONTAINER_multipeermap_put (trackers,
                                                      peer,
                                                      tracker,
                                                      GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
    return;
  }
  GNUNET_BANDWIDTH_tracker_update_quota (tracker,
                                         bandwidth_in);
}
 
 
void
GAS_handle_reservation_request (struct GNUNET_SERVICE_Client *client,
                                const struct ReservationRequestMessage *msg)
{
  struct GNUNET_MQ_Envelope *env;
  struct ReservationResultMessage *result;
  int32_t amount;
  struct GNUNET_TIME_Relative res_delay;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received RESERVATION_REQUEST message\n");
  amount = (int32_t) ntohl (msg->amount);
  res_delay = reservations_reserve (&msg->peer, amount);
  if (res_delay.rel_value_us > 0)
    amount = 0;
  env = GNUNET_MQ_msg (result,
                       GNUNET_MESSAGE_TYPE_ATS_RESERVATION_RESULT);
  result->amount = htonl (amount);
  result->peer = msg->peer;
  result->res_delay = GNUNET_TIME_relative_hton (res_delay);
  GNUNET_STATISTICS_update (GSA_stats,
                            "# reservation requests processed",
                            1,
                            GNUNET_NO);
  GNUNET_MQ_send (GNUNET_SERVICE_client_get_mq (client),
                  env);
}
 
 
void
GAS_reservations_init ()
{
  trackers = GNUNET_CONTAINER_multipeermap_create (128,
                                                   GNUNET_NO);
}
 
 
static int
free_tracker (void *cls,
              const struct GNUNET_PeerIdentity *key,
              void *value)
{
  struct GNUNET_BANDWIDTH_Tracker *tracker = value;
 
  GNUNET_free (tracker);
  return GNUNET_OK;
}
 
 
void
GAS_reservations_done ()
{
  GNUNET_CONTAINER_multipeermap_iterate (trackers,
                                         &free_tracker,
                                         NULL);
  GNUNET_CONTAINER_multipeermap_destroy (trackers);
}
 
 
/* end of gnunet-service-ats_reservations.c */