2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file ats/gnunet-service-ats_reservations.c
23 * @brief ats service, inbound bandwidth reservation management
24 * @author Christian Grothoff
27 #include "gnunet-service-ats_reservations.h"
30 * Number of seconds that available bandwidth carries over
33 #define MAX_BANDWIDTH_CARRY_S 5
37 * Map of peer identities to 'struct GNUNET_BANDWIDTH_Tracker *'s
39 static struct GNUNET_CONTAINER_MultiHashMap *trackers;
43 * Reserve the given amount of incoming bandwidth (in bytes) from the
44 * given peer. If a reservation is not possible right now, return how
45 * long the client should wait before trying again.
47 * @param peer peer to reserve bandwidth from
48 * @param amount number of bytes to reserve
49 * @return 0 if the reservation was successful, FOREVER if the
50 * peer is not connected, otherwise the time to wait
51 * until the reservation might succeed
53 struct GNUNET_TIME_Relative
54 GAS_reservations_reserve (const struct GNUNET_PeerIdentity *peer,
57 struct GNUNET_BANDWIDTH_Tracker *tracker;
58 struct GNUNET_TIME_Relative ret;
60 tracker = GNUNET_CONTAINER_multihashmap_get (trackers,
63 return GNUNET_TIME_UNIT_FOREVER_REL;
66 ret = GNUNET_BANDWIDTH_tracker_get_delay (tracker,
68 if (ret.rel_value > 0)
71 GNUNET_break (GNUNET_NO == /* no == not above limit */
72 GNUNET_BANDWIDTH_tracker_consume (tracker, amount));
73 return GNUNET_TIME_UNIT_ZERO;
78 * Set the amount of bandwidth the other peer could currently transmit
79 * to us (as far as we know) to the given value.
81 * @param peer identity of the peer
82 * @param bandwidth_in currently available bandwidth from that peer to
83 * this peer (estimate)
86 GAS_reservations_set_bandwidth (const struct GNUNET_PeerIdentity *peer,
87 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
89 struct GNUNET_BANDWIDTH_Tracker *tracker;
91 tracker = GNUNET_CONTAINER_multihashmap_get (trackers,
93 if (0 == ntohl (bandwidth_in.value__))
95 GNUNET_assert (GNUNET_YES ==
96 GNUNET_CONTAINER_multihashmap_remove (trackers,
99 GNUNET_free (tracker);
104 tracker = GNUNET_malloc (sizeof (struct GNUNET_BANDWIDTH_Tracker));
105 GNUNET_BANDWIDTH_tracker_init (tracker,
107 MAX_BANDWIDTH_CARRY_S);
108 GNUNET_CONTAINER_multihashmap_put (trackers,
111 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
114 GNUNET_BANDWIDTH_tracker_update_quota (tracker,
121 * Initialize reservations subsystem.
124 GAS_reservations_init ()
126 trackers = GNUNET_CONTAINER_multihashmap_create(128);
131 * Free memory of bandwidth tracker.
134 * @param key peer identity (unused)
135 * @param value the 'struct GNUNET_BANDWIDTH_Tracker' to free
136 * @return GNUNET_OK (continue to iterate)
139 free_tracker (void *cls,
140 const GNUNET_HashCode * key,
143 struct GNUNET_BANDWIDTH_Tracker *tracker = cls;
144 GNUNET_free (tracker);
150 * Shutdown reservations subsystem.
153 GAS_reservations_done ()
155 GNUNET_CONTAINER_multihashmap_iterate (trackers, &free_tracker, NULL);
156 GNUNET_CONTAINER_multihashmap_destroy (trackers);
161 /* end of gnunet-service-ats_reservations.c */