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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_performance.c
* @brief ats service, interaction with 'performance' API
* @author Matthias Wachs
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet-service-ats_performance.h"
#include "gnunet-service-ats_reservations.h"
#include "ats.h"
/**
* We keep clients that are interested in performance in a linked list.
*/
struct PerformanceClient
{
/**
* Next in doubly-linked list.
*/
struct PerformanceClient * next;
/**
* Previous in doubly-linked list.
*/
struct PerformanceClient * prev;
/**
* Actual handle to the client.
*/
struct GNUNET_SERVER_Client *client;
/**
* Options for the client.
*/
enum StartFlag flag;
};
/**
* Head of linked list of all clients to this service.
*/
static struct PerformanceClient *pc_head;
/**
* Tail of linked list of all clients to this service.
*/
static struct PerformanceClient *pc_tail;
/**
* Context for sending messages to performance clients.
*/
static struct GNUNET_SERVER_NotificationContext *nc;
/**
* Find the performance client associated with the given handle.
*
* @param client server handle
* @return internal handle
*/
static struct PerformanceClient *
find_client (struct GNUNET_SERVER_Client *client)
{
struct PerformanceClient * pc;
for (pc = pc_head; pc != NULL; pc = pc->next)
if (pc->client == client)
return pc;
return NULL;
}
/**
* Register a new performance client.
*
* @param client handle of the new client
*/
void
GAS_performance_add_client (struct GNUNET_SERVER_Client *client,
enum StartFlag flag)
{
struct PerformanceClient * pc;
GNUNET_break (NULL == find_client (client));
pc = GNUNET_malloc (sizeof (struct PerformanceClient));
pc->client = client;
pc->flag = flag;
GNUNET_SERVER_notification_context_add (nc, client);
GNUNET_SERVER_client_keep (client);
GNUNET_CONTAINER_DLL_insert(pc_head, pc_tail, pc);
}
/**
* Unregister a client (which may have been a performance client,
* but this is not assured).
*
* @param client handle of the (now dead) client
*/
void
GAS_performance_remove_client (struct GNUNET_SERVER_Client *client)
{
struct PerformanceClient * pc;
pc = find_client (client);
if (NULL == pc)
return;
GNUNET_CONTAINER_DLL_remove (pc_head, pc_tail, pc);
GNUNET_SERVER_client_drop (client);
GNUNET_free (pc);
}
/**
* Handle 'reservation request' messages from clients.
*
* @param cls unused, NULL
* @param client client that sent the request
* @param message the request message
*/
void
GAS_handle_reservation_request (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
const struct ReservationRequestMessage * msg = (const struct ReservationRequestMessage *) message;
struct ReservationResultMessage result;
int32_t amount;
struct GNUNET_TIME_Relative res_delay;
if (NULL == find_client (client))
{
/* missing start message! */
GNUNET_break (0);
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received `%s' message\n",
"RESERVATION_REQUEST");
amount = (int32_t) ntohl (msg->amount);
res_delay = GAS_reservations_reserve (&msg->peer,
amount);
if (res_delay.rel_value > 0)
amount = 0;
result.header.size = htons (sizeof (struct ReservationResultMessage));
result.header.type = htons (GNUNET_MESSAGE_TYPE_ATS_RESERVATION_RESULT);
result.amount = htonl (amount);
result.res_delay = GNUNET_TIME_relative_hton (res_delay);
GNUNET_SERVER_notification_context_unicast (nc,
client,
&result.header,
GNUNET_NO);
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
/**
* Handle 'preference change' messages from clients.
*
* @param cls unused, NULL
* @param client client that sent the request
* @param message the request message
*/
void
GAS_handle_preference_change (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
// const struct ChangePreferenceMessage * msg = (const struct ChangePreferenceMessage *) message;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n", "PREFERENCE_CHANGE");
// FIXME: implement later (we can safely ignore these for now)
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
/**
* Initialize performance subsystem.
*
* @param server handle to our server
*/
void
GAS_performance_init (struct GNUNET_SERVER_Handle *server)
{
nc = GNUNET_SERVER_notification_context_create (server, 128);
}
/**
* Shutdown performance subsystem.
*/
void
GAS_performance_done ()
{
GNUNET_SERVER_notification_context_destroy (nc);
nc = NULL;
}
/* end of gnunet-service-ats_performance.c */
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