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/*
This file is part of GNUnet.
(C) 2011 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 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file ats/gnunet-service-ats_reservations.c
* @brief ats service, inbound bandwidth reservation management
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet-service-ats_reservations.h"
/**
* Number of seconds that available bandwidth carries over
* (can accumulate).
*/
#define MAX_BANDWIDTH_CARRY_S 5
/**
* Map of peer identities to 'struct GNUNET_BANDWIDTH_Tracker *'s
*/
static struct GNUNET_CONTAINER_MultiHashMap *trackers;
/**
* Reserve the given amount of incoming bandwidth (in bytes) from the
* given peer. If a reservation is not possible right now, return how
* long the client should wait before trying again.
*
* @param peer peer to reserve bandwidth from
* @param amount number of bytes to reserve
* @return 0 if the reservation was successful, FOREVER if the
* peer is not connected, otherwise the time to wait
* until the reservation might succeed
*/
struct GNUNET_TIME_Relative
GAS_reservations_reserve (const struct GNUNET_PeerIdentity *peer,
int32_t amount)
{
struct GNUNET_BANDWIDTH_Tracker *tracker;
struct GNUNET_TIME_Relative ret;
tracker = GNUNET_CONTAINER_multihashmap_get (trackers, &peer->hashPubKey);
if (NULL == tracker)
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;
}
/**
* Set the amount of bandwidth the other peer could currently transmit
* to us (as far as we know) to the given value.
*
* @param peer identity of the peer
* @param bandwidth_in currently available bandwidth from that peer to
* this peer (estimate)
*/
void
GAS_reservations_set_bandwidth (const struct GNUNET_PeerIdentity *peer,
struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
{
struct GNUNET_BANDWIDTH_Tracker *tracker;
tracker = GNUNET_CONTAINER_multihashmap_get (trackers, &peer->hashPubKey);
if (0 == ntohl (bandwidth_in.value__))
{
if (NULL == tracker)
return;
GNUNET_assert (GNUNET_YES ==
GNUNET_CONTAINER_multihashmap_remove (trackers,
&peer->hashPubKey,
tracker));
GNUNET_free (tracker);
return;
}
if (NULL == tracker)
{
tracker = GNUNET_malloc (sizeof (struct GNUNET_BANDWIDTH_Tracker));
GNUNET_BANDWIDTH_tracker_init (tracker, bandwidth_in,
MAX_BANDWIDTH_CARRY_S);
GNUNET_CONTAINER_multihashmap_put (trackers, &peer->hashPubKey, tracker,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
return;
}
GNUNET_BANDWIDTH_tracker_update_quota (tracker, bandwidth_in);
}
/**
* Initialize reservations subsystem.
*/
void
GAS_reservations_init ()
{
trackers = GNUNET_CONTAINER_multihashmap_create (128, GNUNET_NO);
}
/**
* Free memory of bandwidth tracker.
*
* @param cls NULL
* @param key peer identity (unused)
* @param value the 'struct GNUNET_BANDWIDTH_Tracker' to free
* @return GNUNET_OK (continue to iterate)
*/
static int
free_tracker (void *cls, const struct GNUNET_HashCode * key, void *value)
{
struct GNUNET_BANDWIDTH_Tracker *tracker = value;
GNUNET_free (tracker);
return GNUNET_OK;
}
/**
* Shutdown reservations subsystem.
*/
void
GAS_reservations_done ()
{
GNUNET_CONTAINER_multihashmap_iterate (trackers, &free_tracker, NULL);
GNUNET_CONTAINER_multihashmap_destroy (trackers);
}
/* end of gnunet-service-ats_reservations.c */
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