summaryrefslogtreecommitdiff
path: root/src/ats/gnunet-service-ats_performance.c
blob: 8aad96eea959cf7c64e52b60cce060eada45d734 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
/*
     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.h"
#include "gnunet-service-ats_addresses.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;

};


/**
 * We keep clients that are interested in performance in a linked list.
 */
struct AddressIteration
{
  /**
   * Actual handle to the client.
   */
  struct PerformanceClient *pc;

  int all;

  uint32_t id;

  unsigned int msg_type;
};

/**
 * Address handle
 */
static struct GAS_Addresses_Handle *GSA_addresses;

/**
 * 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;
}

/**
 * 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);
  GAS_addresses_preference_client_disconnect (GSA_addresses, client);
  GNUNET_free (pc);
}

/**
 * Transmit the given performance information to all performance
 * clients.
 *
 * @param pc performance client to send to
 * @param peer peer for which this is an address suggestion
 * @param plugin_name 0-termintated string specifying the transport plugin
 * @param plugin_addr binary address for the plugin to use
 * @param plugin_addr_len number of bytes in plugin_addr
 * @param active is this address active
 * @param atsi performance data for the address
 * @param atsi_count number of performance records in 'ats'
 * @param bandwidth_out assigned outbound bandwidth
 * @param bandwidth_in assigned inbound bandwidth
 */
void
GAS_performance_notify_client (struct PerformanceClient *pc,
                               const struct GNUNET_PeerIdentity *peer,
                               const char *plugin_name,
                               const void *plugin_addr, size_t plugin_addr_len,
                               const int active,
                               const struct GNUNET_ATS_Information *atsi,
                               uint32_t atsi_count,
                               struct GNUNET_BANDWIDTH_Value32NBO
                               bandwidth_out,
                               struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
{

  struct PeerInformationMessage *msg;
  size_t plugin_name_length = strlen (plugin_name) + 1;
  size_t msize =
      sizeof (struct PeerInformationMessage) +
      atsi_count * sizeof (struct GNUNET_ATS_Information) + plugin_addr_len +
      plugin_name_length;
  char buf[msize] GNUNET_ALIGN;
  struct GNUNET_ATS_Information *atsp;
  char *addrp;

  GNUNET_assert (NULL != pc);
  if (NULL == find_client (pc->client))
    return; /* Client disconnected */

  GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
  GNUNET_assert (atsi_count <
                 GNUNET_SERVER_MAX_MESSAGE_SIZE /
                 sizeof (struct GNUNET_ATS_Information));
  msg = (struct PeerInformationMessage *) buf;
  msg->header.size = htons (msize);
  msg->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_PEER_INFORMATION);
  msg->id = htonl (0);
  msg->ats_count = htonl (atsi_count);
  msg->peer = *peer;
  msg->address_length = htons (plugin_addr_len);
  msg->address_active = ntohl (active);
  msg->plugin_name_length = htons (plugin_name_length);
  msg->bandwidth_out = bandwidth_out;
  msg->bandwidth_in = bandwidth_in;
  atsp = (struct GNUNET_ATS_Information *) &msg[1];
  memcpy (atsp, atsi, sizeof (struct GNUNET_ATS_Information) * atsi_count);
  addrp = (char *) &atsp[atsi_count];
  memcpy (addrp, plugin_addr, plugin_addr_len);
  strcpy (&addrp[plugin_addr_len], plugin_name);
  GNUNET_SERVER_notification_context_unicast (nc, pc->client, &msg->header,
                                              GNUNET_YES);
}


/**
 * Transmit the given performance information to all performance
 * clients.
 *
 * @param peer peer for which this is an address suggestion
 * @param plugin_name 0-termintated string specifying the transport plugin
 * @param plugin_addr binary address for the plugin to use
 * @param plugin_addr_len number of bytes in plugin_addr
 * @param active is this address active
 * @param atsi performance data for the address
 * @param atsi_count number of performance records in 'ats'
 * @param bandwidth_out assigned outbound bandwidth
 * @param bandwidth_in assigned inbound bandwidth
 */
void
GAS_performance_notify_all_clients (const struct GNUNET_PeerIdentity *peer,
                                const char *plugin_name,
                                const void *plugin_addr, size_t plugin_addr_len,
                                const int active,
                                const struct GNUNET_ATS_Information *atsi,
                                uint32_t atsi_count,
                                struct GNUNET_BANDWIDTH_Value32NBO
                                bandwidth_out,
                                struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
{
  struct PerformanceClient *pc;
  for (pc = pc_head; pc != NULL; pc = pc->next)
    if (pc->flag == START_FLAG_PERFORMANCE_WITH_PIC)
    {
        GAS_performance_notify_client (pc,
                                       peer,
                                       plugin_name, plugin_addr, plugin_addr_len,
                                       active,
                                       atsi, atsi_count,
                                       bandwidth_out, bandwidth_in);
    }
  GNUNET_STATISTICS_update (GSA_stats,
                            "# performance updates given to clients", 1,
                            GNUNET_NO);
}


static void
peerinfo_it (void *cls,
             const struct GNUNET_PeerIdentity *id,
             const char *plugin_name,
             const void *plugin_addr, size_t plugin_addr_len,
             const int active,
             const struct GNUNET_ATS_Information *atsi,
             uint32_t atsi_count,
             struct GNUNET_BANDWIDTH_Value32NBO
             bandwidth_out,
             struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
{
  struct PerformanceClient *pc = cls;
  GNUNET_assert (NULL != pc);
  if (NULL == id)
    return;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Callback for peer `%s' plugin `%s' BW out %llu, BW in %llu \n",
              GNUNET_i2s (id),
              plugin_name,
              ntohl (bandwidth_out.value__),
              ntohl (bandwidth_in.value__));
  GAS_performance_notify_client(pc,
                                id,
                                plugin_name,
                                plugin_addr,
                                plugin_addr_len,
                                active,
                                atsi, atsi_count,
                                bandwidth_out, bandwidth_in);
}


/**
 * Iterator for GAS_performance_add_client
 *
 * @param cls the client requesting information
 * @param id result
 */
static void
peer_it (void *cls,
         const struct GNUNET_PeerIdentity *id)
{
  struct PerformanceClient *pc = cls;
  if (NULL != id)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Callback for peer `%s'\n", GNUNET_i2s (id));
    GAS_addresses_get_peer_info (GSA_addresses, id, &peerinfo_it, pc);
  }
}

/**
 * Register a new performance client.
 *
 * @param client handle of the new client
 * @param flag flag specifying the type of the 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_log (GNUNET_ERROR_TYPE_DEBUG, "Adding performance client %s PIC\n",
      (flag == START_FLAG_PERFORMANCE_WITH_PIC) ? "with" : "without");

  GNUNET_SERVER_notification_context_add (nc, client);
  GNUNET_CONTAINER_DLL_insert (pc_head, pc_tail, pc);

  /* Send information about clients */
  GAS_addresses_iterate_peers (GSA_addresses, &peer_it, pc);
}


static void transmit_req_addr (struct AddressIteration *ai,
    const struct GNUNET_PeerIdentity *id,
    const char *plugin_name,
    const void *plugin_addr, size_t plugin_addr_len,
    const int active,
    const struct GNUNET_ATS_Information *atsi,
    uint32_t atsi_count,
    struct GNUNET_BANDWIDTH_Value32NBO
    bandwidth_out,
    struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)

{
  struct GNUNET_ATS_Information *atsp;
  struct PeerInformationMessage *msg;
  char *addrp;
  size_t plugin_name_length;
  size_t msize;

  if (NULL != plugin_name)
    plugin_name_length = strlen (plugin_name) + 1;
  else
    plugin_name_length = 0;
  msize = sizeof (struct PeerInformationMessage) +
          atsi_count * sizeof (struct GNUNET_ATS_Information) +
          plugin_addr_len + plugin_name_length;
  char buf[msize] GNUNET_ALIGN;

  GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
  GNUNET_assert (atsi_count <
                 GNUNET_SERVER_MAX_MESSAGE_SIZE /
                 sizeof (struct GNUNET_ATS_Information));
  msg = (struct PeerInformationMessage *) buf;
  msg->header.size = htons (msize);
  msg->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_ADDRESSLIST_RESPONSE);
  msg->ats_count = htonl (atsi_count);
  msg->id = htonl (ai->id);
  if (NULL != id)
    msg->peer = *id;
  else
    memset (&msg->peer, '\0', sizeof (struct GNUNET_PeerIdentity));
  msg->address_length = htons (plugin_addr_len);
  msg->address_active = ntohl (active);
  msg->plugin_name_length = htons (plugin_name_length);
  msg->bandwidth_out = bandwidth_out;
  msg->bandwidth_in = bandwidth_in;
  atsp = (struct GNUNET_ATS_Information *) &msg[1];
  memcpy (atsp, atsi, sizeof (struct GNUNET_ATS_Information) * atsi_count);
  addrp = (char *) &atsp[atsi_count];
  if (NULL != plugin_addr)
    memcpy (addrp, plugin_addr, plugin_addr_len);
  if (NULL != plugin_name)
    strcpy (&addrp[plugin_addr_len], plugin_name);
  GNUNET_SERVER_notification_context_unicast (nc, ai->pc->client, &msg->header,
                                              GNUNET_NO);
}

static void
req_addr_peerinfo_it (void *cls,
             const struct GNUNET_PeerIdentity *id,
             const char *plugin_name,
             const void *plugin_addr, size_t plugin_addr_len,
             const int active,
             const struct GNUNET_ATS_Information *atsi,
             uint32_t atsi_count,
             struct GNUNET_BANDWIDTH_Value32NBO
             bandwidth_out,
             struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
{
  struct AddressIteration *ai = cls;

  GNUNET_assert (NULL != ai);
  GNUNET_assert (NULL != ai->pc);
  if (NULL == find_client (ai->pc->client))
    return; /* Client disconnected */

  if ((NULL == id) && (NULL == plugin_name) && (NULL == plugin_addr))
  {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Address iteration done\n");
      return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Callback for  %s peer `%s' plugin `%s' BW out %u, BW in %u \n",
              (active == GNUNET_YES) ? "ACTIVE" : "INACTIVE",
              GNUNET_i2s (id),
              plugin_name,
              (unsigned int) ntohl (bandwidth_out.value__),
              (unsigned int) ntohl (bandwidth_in.value__));

  /* Transmit result */
  if ((GNUNET_YES == ai->all) || (GNUNET_YES == active))
  {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Sending result for  %s peer `%s' plugin `%s' BW out %u, BW in %u \n",
                  (active == GNUNET_YES) ? "ACTIVE" : "INACTIVE",
                  GNUNET_i2s (id),
                  plugin_name,
                  (unsigned int) ntohl (bandwidth_out.value__),
                  (unsigned int) ntohl (bandwidth_in.value__));
    transmit_req_addr (cls,
        id,
        plugin_name,
        plugin_addr, plugin_addr_len,
        active,
        atsi,
        atsi_count,
        bandwidth_out, bandwidth_in);
  }
}


/**
 * Iterator for GAS_handle_request_address_list
 *
 * @param cls the client requesting information
 * @param id result
 */
static void
req_addr_peer_it (void *cls,
         const struct GNUNET_PeerIdentity *id)
{
  struct AddressIteration *ai = cls;
  if (NULL != id)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Callback for peer `%s'\n", GNUNET_i2s (id));
    GAS_addresses_get_peer_info (GSA_addresses, id, &req_addr_peerinfo_it, ai);
  }
  else
  {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer iteration done\n");
  }
}


/**
 * Handle 'address list request' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_request_address_list (void *cls, struct GNUNET_SERVER_Client *client,
                                 const struct GNUNET_MessageHeader *message)
{
  struct PerformanceClient *pc;
  struct AddressIteration ai;
  struct AddressListRequestMessage * alrm = (struct AddressListRequestMessage *) message;
  struct GNUNET_PeerIdentity allzeros;
  struct GNUNET_BANDWIDTH_Value32NBO bandwidth_zero;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
              "ADDRESSLIST_REQUEST");

  if (NULL == (pc = find_client(client)))
  {
      GNUNET_break (0);
      return;
  }

  ai.all = ntohl (alrm->all);
  ai.id = ntohl (alrm->id);
  ai.pc = pc;

  memset (&allzeros, '\0', sizeof (struct GNUNET_PeerIdentity));
  bandwidth_zero.value__ = htonl (0);
  if (0 == memcmp (&alrm->peer, &allzeros, sizeof (struct GNUNET_PeerIdentity)))
  {
      /* Return addresses for all peers */
      GAS_addresses_iterate_peers (GSA_addresses, &req_addr_peer_it, &ai);
      transmit_req_addr (&ai, NULL, NULL, NULL, 0, GNUNET_NO, NULL, 0, bandwidth_zero, bandwidth_zero);
  }
  else
  {
      /* Return addresses for a specific peer */
      GAS_addresses_get_peer_info (GSA_addresses, &alrm->peer, &req_addr_peerinfo_it, &ai);
      transmit_req_addr (&ai, NULL, NULL, NULL, 0, GNUNET_NO, NULL, 0, bandwidth_zero, bandwidth_zero);
  }
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


void
GAS_handle_performance_update (struct GNUNET_PeerIdentity *peer,
															 const char *plugin_name,
															 const void *plugin_addr,
															 size_t plugin_addr_len,
															 const int active,
															 struct GNUNET_ATS_Information *ats,
															 uint32_t ats_count,
															 struct GNUNET_BANDWIDTH_Value32NBO
															 bandwidth_out,
															 struct GNUNET_BANDWIDTH_Value32NBO
															 bandwidth_in)
{
/* Notify here */
	GAS_performance_notify_all_clients (peer,
																			plugin_name,
																			plugin_addr, plugin_addr_len,
																			active,
																			ats, ats_count,
																			bandwidth_out, bandwidth_in);

#if 0
	struct PerformanceClient *cur;
	struct PerformanceMonitorClient *curm;
	struct MonitorResponseMessage *mrm;
	size_t msglen;

	msglen = sizeof (struct MonitorResponseMessage) +
					 ats_count * sizeof (struct GNUNET_ATS_Information);
	mrm = GNUNET_malloc (msglen);

	mrm->header.type = htons (GNUNET_MESSAGE_TYPE_ATS_MONITOR_RESPONSE);
	mrm->header.size = htons (msglen);
	mrm->ats_count = htonl (ats_count);
	mrm->peer = *peer;
	memcpy (&mrm[1], ats, ats_count * sizeof (struct GNUNET_ATS_Information));

	for (cur = pc_head; NULL != cur; cur = cur->next)
		for (curm = cur->pm_head; NULL != curm; curm = curm->next)
		{
				/* Notify client about update */
				mrm->id = htonl (curm->id);
			  GNUNET_SERVER_notification_context_unicast (nc,
			  		cur->client,
			  		(struct GNUNET_MessageHeader *) mrm,
			  		GNUNET_YES);
		}
	GNUNET_free (mrm);
#endif
}


/**
 * 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_us > 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.peer = msg->peer;
  result.res_delay = GNUNET_TIME_relative_hton (res_delay);
  GNUNET_STATISTICS_update (GSA_stats, "# reservation requests processed", 1,
                            GNUNET_NO);
  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 PreferenceInformation *pi;
  uint16_t msize;
  uint32_t nump;
  uint32_t i;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
              "PREFERENCE_CHANGE");
  msize = ntohs (message->size);
  if (msize < sizeof (struct ChangePreferenceMessage))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  msg = (const struct ChangePreferenceMessage *) message;
  nump = ntohl (msg->num_preferences);
  if (msize !=
      sizeof (struct ChangePreferenceMessage) +
      nump * sizeof (struct PreferenceInformation))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  GNUNET_STATISTICS_update (GSA_stats, "# preference change requests processed",
                            1, GNUNET_NO);
  pi = (const struct PreferenceInformation *) &msg[1];
  for (i = 0; i < nump; i++)
    GAS_addresses_preference_change (GSA_addresses,
                                     client,
                                     &msg->peer,
                                     (enum GNUNET_ATS_PreferenceKind)
                                     ntohl (pi[i].preference_kind),
                                     pi[i].preference_value);
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}


/**
 * Handle 'preference feedback' messages from clients.
 *
 * @param cls unused, NULL
 * @param client client that sent the request
 * @param message the request message
 */
void
GAS_handle_preference_feedback (void *cls,
                              struct GNUNET_SERVER_Client *client,
                              const struct GNUNET_MessageHeader *message)
{
  const struct FeedbackPreferenceMessage *msg;
  const struct PreferenceInformation *pi;
  uint16_t msize;
  uint32_t nump;
  uint32_t i;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' message\n",
              "PREFERENCE_FEEDBACK");
  msize = ntohs (message->size);
  if (msize < sizeof (struct FeedbackPreferenceMessage))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  msg = (const struct FeedbackPreferenceMessage *) message;
  nump = ntohl (msg->num_feedback);
  if (msize !=
      sizeof (struct FeedbackPreferenceMessage) +
      nump * sizeof (struct PreferenceInformation))
  {
    GNUNET_break (0);
    GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
    return;
  }
  GNUNET_STATISTICS_update (GSA_stats, "# preference feedbacks requests processed",
                            1, GNUNET_NO);
  pi = (const struct PreferenceInformation *) &msg[1];
  for (i = 0; i < nump; i++)
    GAS_addresses_preference_feedback (GSA_addresses,
                                     client,
                                     &msg->peer,
                                     GNUNET_TIME_relative_ntoh(msg->scope),
                                     (enum GNUNET_ATS_PreferenceKind)
                                     ntohl (pi[i].preference_kind),
                                     pi[i].preference_value);
  GNUNET_SERVER_receive_done (client, GNUNET_OK);
}



/**
 * Initialize performance subsystem.
 *
 * @param server handle to our server
 * @param addresses the address handle to use
 */
void
GAS_performance_init (struct GNUNET_SERVER_Handle *server,
                      struct GAS_Addresses_Handle *addresses)
{
  GSA_addresses = addresses;
  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 */