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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 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.
*/
/**
* @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"
#include "gnunet-service-ats.h"
#include "ats.h"
/**
* Number of seconds that available bandwidth carries over
* (can accumulate). Note that the
* test_ats_reservation_api test depends on this value!
*/
#define MAX_BANDWIDTH_CARRY_S 5
/**
* Map of peer identities to `struct GNUNET_BANDWIDTH_Tracker *`s
*/
static struct GNUNET_CONTAINER_MultiPeerMap *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
*/
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;
}
/**
* 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_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);
}
/**
* Handle 'reservation request' messages from clients.
*
* @param client client that sent the request
* @param msg the request message
*/
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);
}
/**
* Initialize reservations subsystem.
*/
void
GAS_reservations_init ()
{
trackers = GNUNET_CONTAINER_multipeermap_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_PeerIdentity *key,
void *value)
{
struct GNUNET_BANDWIDTH_Tracker *tracker = value;
GNUNET_free (tracker);
return GNUNET_OK;
}
/**
* Shutdown reservations subsystem.
*/
void
GAS_reservations_done ()
{
GNUNET_CONTAINER_multipeermap_iterate (trackers,
&free_tracker,
NULL);
GNUNET_CONTAINER_multipeermap_destroy (trackers);
}
/* end of gnunet-service-ats_reservations.c */
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