aboutsummaryrefslogtreecommitdiff
path: root/src/auditor/taler-helper-auditor-purses.c
blob: f35020734486aa59d2b45e6c0014f55ffffc1333 (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
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
/*
  This file is part of TALER
  Copyright (C) 2016-2022 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it under the
  terms of the GNU Affero Public License as published by the Free Software
  Foundation; either version 3, or (at your option) any later version.

  TALER 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 Public License for more details.

  You should have received a copy of the GNU Affero Public License along with
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file auditor/taler-helper-auditor-purses.c
 * @brief audits the purses of an exchange database
 * @author Christian Grothoff
 */
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include "taler_auditordb_plugin.h"
#include "taler_exchangedb_lib.h"
#include "taler_json_lib.h"
#include "taler_bank_service.h"
#include "taler_signatures.h"
#include "report-lib.h"


/**
 * Use a 1 day grace period to deal with clocks not being perfectly synchronized.
 */
#define EXPIRATION_GRACE_PERIOD GNUNET_TIME_UNIT_DAYS

/**
 * Return value from main().
 */
static int global_ret;

/**
 * Checkpointing our progress for purses.
 */
static struct TALER_AUDITORDB_ProgressPointPurse ppp;

/**
 * Checkpointing our progress for purses.
 */
static struct TALER_AUDITORDB_ProgressPointPurse ppp_start;

/**
 * Global statistics about purses.
 */
static struct TALER_AUDITORDB_PurseBalance balance;

/**
 * Array of reports about row inconsitencies.
 */
static json_t *report_row_inconsistencies;

/**
 * Array of reports about purse balance insufficient inconsitencies.
 */
static json_t *report_purse_balance_insufficient_inconsistencies;

/**
 * Total amount purses were merged with insufficient balance.
 */
static struct TALER_Amount total_balance_insufficient_loss;

/**
 * Total amount purse decisions are delayed past deadline.
 */
static struct TALER_Amount total_delayed_decisions;

/**
 * Array of reports about purses's not being closed inconsitencies.
 */
static json_t *report_purse_not_closed_inconsistencies;

/**
 * Total amount affected by purses not having been closed on time.
 */
static struct TALER_Amount total_balance_purse_not_closed;

/**
 * Report about amount calculation differences (causing profit
 * or loss at the exchange).
 */
static json_t *report_amount_arithmetic_inconsistencies;

/**
 * Profits the exchange made by bad amount calculations.
 */
static struct TALER_Amount total_arithmetic_delta_plus;

/**
 * Losses the exchange made by bad amount calculations.
 */
static struct TALER_Amount total_arithmetic_delta_minus;

/**
 * Array of reports about coin operations with bad signatures.
 */
static json_t *report_bad_sig_losses;

/**
 * Total amount lost by operations for which signatures were invalid.
 */
static struct TALER_Amount total_bad_sig_loss;

/**
 * Should we run checks that only work for exchange-internal audits?
 */
static int internal_checks;

/* ***************************** Report logic **************************** */


/**
 * Report a (serious) inconsistency in the exchange's database with
 * respect to calculations involving amounts.
 *
 * @param operation what operation had the inconsistency
 * @param rowid affected row, 0 if row is missing
 * @param exchange amount calculated by exchange
 * @param auditor amount calculated by auditor
 * @param profitable 1 if @a exchange being larger than @a auditor is
 *           profitable for the exchange for this operation,
 *           -1 if @a exchange being smaller than @a auditor is
 *           profitable for the exchange, and 0 if it is unclear
 */
static void
report_amount_arithmetic_inconsistency (
  const char *operation,
  uint64_t rowid,
  const struct TALER_Amount *exchange,
  const struct TALER_Amount *auditor,
  int profitable)
{
  struct TALER_Amount delta;
  struct TALER_Amount *target;

  if (0 < TALER_amount_cmp (exchange,
                            auditor))
  {
    /* exchange > auditor */
    TALER_ARL_amount_subtract (&delta,
                               exchange,
                               auditor);
  }
  else
  {
    /* auditor < exchange */
    profitable = -profitable;
    TALER_ARL_amount_subtract (&delta,
                               auditor,
                               exchange);
  }
  TALER_ARL_report (report_amount_arithmetic_inconsistencies,
                    GNUNET_JSON_PACK (
                      GNUNET_JSON_pack_string ("operation",
                                               operation),
                      GNUNET_JSON_pack_uint64 ("rowid",
                                               rowid),
                      TALER_JSON_pack_amount ("exchange",
                                              exchange),
                      TALER_JSON_pack_amount ("auditor",
                                              auditor),
                      GNUNET_JSON_pack_int64 ("profitable",
                                              profitable)));
  if (0 != profitable)
  {
    target = (1 == profitable)
        ? &total_arithmetic_delta_plus
        : &total_arithmetic_delta_minus;
    TALER_ARL_amount_add (target,
                          target,
                          &delta);
  }
}


/**
 * Report a (serious) inconsistency in the exchange's database.
 *
 * @param table affected table
 * @param rowid affected row, 0 if row is missing
 * @param diagnostic message explaining the problem
 */
static void
report_row_inconsistency (const char *table,
                          uint64_t rowid,
                          const char *diagnostic)
{
  TALER_ARL_report (report_row_inconsistencies,
                    GNUNET_JSON_PACK (
                      GNUNET_JSON_pack_string ("table",
                                               table),
                      GNUNET_JSON_pack_uint64 ("row",
                                               rowid),
                      GNUNET_JSON_pack_string ("diagnostic",
                                               diagnostic)));
}


/**
 * Obtain the purse fee for a purse created at @a time.
 *
 * @param atime when was the purse created
 * @param[out] fee set to the purse fee
 * @return #GNUNET_OK on success
 */
static enum GNUNET_GenericReturnValue
get_purse_fee (struct GNUNET_TIME_Timestamp atime,
               struct TALER_Amount *fee)
{
  struct TALER_MasterSignatureP master_sig;
  struct GNUNET_TIME_Timestamp start_date;
  struct GNUNET_TIME_Timestamp end_date;
  struct TALER_GlobalFeeSet fees;
  struct GNUNET_TIME_Relative ptimeout;
  struct GNUNET_TIME_Relative hexp;
  uint32_t pacl;

  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT !=
      TALER_ARL_edb->get_global_fee (TALER_ARL_edb->cls,
                                     atime,
                                     &start_date,
                                     &end_date,
                                     &fees,
                                     &ptimeout,
                                     &hexp,
                                     &pacl,
                                     &master_sig))
  {
    char *diag;

    GNUNET_asprintf (&diag,
                     "purse fee unavailable at %s\n",
                     GNUNET_TIME_timestamp2s (atime));
    report_row_inconsistency ("purse-fee",
                              atime.abs_time.abs_value_us,
                              diag);
    GNUNET_free (diag);
    return GNUNET_SYSERR;
  }
  *fee = fees.purse;
  return GNUNET_OK;
}


/* ***************************** Analyze purses ************************ */
/* This logic checks the purses_requests, purse_deposits,
   purse_refunds, purse_merges and account_merges */

/**
 * Summary data we keep per purse.
 */
struct PurseSummary
{
  /**
   * Public key of the purse.
   * Always set when the struct is first initialized.
   */
  struct TALER_PurseContractPublicKeyP purse_pub;

  /**
   * Balance of the purse from deposits (includes purse fee, excludes deposit
   * fees), as calculated by auditor.
   */
  struct TALER_Amount balance;

  /**
   * Expected value of the purse, excludes purse fee.
   */
  struct TALER_Amount total_value;

  /**
   * Purse balance according to exchange DB.
   */
  struct TALER_Amount exchange_balance;

  /**
   * Contract terms of the purse.
   */
  struct TALER_PrivateContractHashP h_contract_terms;

  /**
   * Merge timestamp (as per exchange DB).
   */
  struct GNUNET_TIME_Timestamp merge_timestamp;

  /**
   * Purse creation date.  This is when the merge
   * fee is applied.
   */
  struct GNUNET_TIME_Timestamp creation_date;

  /**
   * Purse expiration date.
   */
  struct GNUNET_TIME_Timestamp expiration_date;

  /**
   * Did we have a previous purse info?  Used to decide between UPDATE and
   * INSERT later.  Initialized in #load_auditor_purse_summary().
   */
  bool had_pi;

  /**
   * Was the purse deleted?  FIXME: Not yet handled (do we need to? purse
   * might just appear as expired eventually; but in the meantime, exchange
   * may seem to have refunded the coins for no good reason...), also we do
   * not yet check the deletion signature.
   */
  bool purse_deleted;

};


/**
 * Load the auditor's remembered state about the purse into @a ps.
 *
 * @param[in,out] ps purse summary to (fully) initialize
 * @return transaction status code
 */
static enum GNUNET_DB_QueryStatus
load_auditor_purse_summary (struct PurseSummary *ps)
{
  enum GNUNET_DB_QueryStatus qs;
  uint64_t rowid;

  qs = TALER_ARL_adb->get_purse_info (TALER_ARL_adb->cls,
                                      &ps->purse_pub,
                                      &TALER_ARL_master_pub,
                                      &rowid,
                                      &ps->balance,
                                      &ps->expiration_date);
  if (0 > qs)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }
  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
  {
    ps->had_pi = false;
    GNUNET_assert (GNUNET_OK ==
                   TALER_amount_set_zero (TALER_ARL_currency,
                                          &ps->balance));
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Creating fresh purse `%s'\n",
                TALER_B2S (&ps->purse_pub));
    return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
  }
  ps->had_pi = true;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Auditor remembers purse `%s' has balance %s\n",
              TALER_B2S (&ps->purse_pub),
              TALER_amount2s (&ps->balance));
  return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}


/**
 * Closure to the various callbacks we make while checking a purse.
 */
struct PurseContext
{
  /**
   * Map from hash of purse's public key to a `struct PurseSummary`.
   */
  struct GNUNET_CONTAINER_MultiHashMap *purses;

  /**
   * Transaction status code, set to error codes if applicable.
   */
  enum GNUNET_DB_QueryStatus qs;

};


/**
 * Create a new reserve for @a reserve_pub in @a rc.
 *
 * @param[in,out] pc context to update
 * @param purse_pub key for which to create a purse
 * @return NULL on error
 */
static struct PurseSummary *
setup_purse (struct PurseContext *pc,
             const struct TALER_PurseContractPublicKeyP *purse_pub)
{
  struct PurseSummary *ps;
  struct GNUNET_HashCode key;
  enum GNUNET_DB_QueryStatus qs;

  GNUNET_CRYPTO_hash (purse_pub,
                      sizeof (*purse_pub),
                      &key);
  ps = GNUNET_CONTAINER_multihashmap_get (pc->purses,
                                          &key);
  if (NULL != ps)
    return ps;
  ps = GNUNET_new (struct PurseSummary);
  ps->purse_pub = *purse_pub;
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &ps->balance));
  /* get purse meta-data from exchange DB */
  qs = TALER_ARL_edb->select_purse (TALER_ARL_edb->cls,
                                    purse_pub,
                                    &ps->creation_date,
                                    &ps->expiration_date,
                                    &ps->total_value,
                                    &ps->exchange_balance,
                                    &ps->h_contract_terms,
                                    &ps->merge_timestamp,
                                    &ps->purse_deleted);
  if (0 >= qs)
  {
    GNUNET_free (ps);
    pc->qs = qs;
    return NULL;
  }
  if (0 > (qs = load_auditor_purse_summary (ps)))
  {
    GNUNET_free (ps);
    pc->qs = qs;
    return NULL;
  }
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONTAINER_multihashmap_put (pc->purses,
                                                    &key,
                                                    ps,
                                                    GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
  return ps;
}


/**
 * Function called on purse requests.
 *
 * @param cls closure
 * @param rowid which row in the database was the request stored in
 * @param purse_pub public key of the purse
 * @param merge_pub public key representing the merge capability
 * @param purse_creation when was the purse created
 * @param purse_expiration when would an unmerged purse expire
 * @param h_contract_terms contract associated with the purse
 * @param age_limit the age limit for deposits into the purse
 * @param target_amount amount to be put into the purse
 * @param purse_sig signature of the purse over the initialization data
 * @return #GNUNET_OK to continue to iterate
   */
static enum GNUNET_GenericReturnValue
handle_purse_requested (
  void *cls,
  uint64_t rowid,
  const struct TALER_PurseContractPublicKeyP *purse_pub,
  const struct TALER_PurseMergePublicKeyP *merge_pub,
  struct GNUNET_TIME_Timestamp purse_creation,
  struct GNUNET_TIME_Timestamp purse_expiration,
  const struct TALER_PrivateContractHashP *h_contract_terms,
  uint32_t age_limit,
  const struct TALER_Amount *target_amount,
  const struct TALER_PurseContractSignatureP *purse_sig)
{
  struct PurseContext *pc = cls;
  struct PurseSummary *ps;
  struct GNUNET_HashCode key;

  if (GNUNET_OK !=
      TALER_wallet_purse_create_verify (purse_expiration,
                                        h_contract_terms,
                                        merge_pub,
                                        age_limit,
                                        target_amount,
                                        purse_pub,
                                        purse_sig))
  {
    TALER_ARL_report (report_bad_sig_losses,
                      GNUNET_JSON_PACK (
                        GNUNET_JSON_pack_string ("operation",
                                                 "purse-reqeust"),
                        GNUNET_JSON_pack_uint64 ("row",
                                                 rowid),
                        TALER_JSON_pack_amount ("loss",
                                                target_amount),
                        GNUNET_JSON_pack_data_auto ("key_pub",
                                                    purse_pub)));
    TALER_ARL_amount_add (&total_bad_sig_loss,
                          &total_bad_sig_loss,
                          target_amount);
  }
  GNUNET_CRYPTO_hash (purse_pub,
                      sizeof (*purse_pub),
                      &key);
  ps = GNUNET_new (struct PurseSummary);
  ps->purse_pub = *purse_pub;
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &ps->balance));
  ps->creation_date = purse_creation;
  ps->expiration_date = purse_expiration;
  ps->total_value = *target_amount;
  ps->h_contract_terms = *h_contract_terms;
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONTAINER_multihashmap_put (pc->purses,
                                                    &key,
                                                    ps,
                                                    GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
  return GNUNET_OK;
}


/**
 * Function called with details about purse deposits that have been made, with
 * the goal of auditing the deposit's execution.
 *
 * @param cls closure
 * @param rowid unique serial ID for the deposit in our DB
 * @param deposit deposit details
 * @param reserve_pub which reserve is the purse merged into, NULL if unknown
 * @param flags purse flags
 * @param auditor_balance purse balance (according to the
 *          auditor during auditing)
 * @param purse_total target amount the purse should reach
 * @param denom_pub denomination public key of @a coin_pub
 * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
 */
static enum GNUNET_GenericReturnValue
handle_purse_deposits (
  void *cls,
  uint64_t rowid,
  const struct TALER_EXCHANGEDB_PurseDeposit *deposit,
  const struct TALER_ReservePublicKeyP *reserve_pub,
  enum TALER_WalletAccountMergeFlags flags,
  const struct TALER_Amount *auditor_balance,
  const struct TALER_Amount *purse_total,
  const struct TALER_DenominationPublicKey *denom_pub)
{
  struct PurseContext *pc = cls;
  struct TALER_Amount amount_minus_fee;
  struct PurseSummary *ps;
  const char *base_url
    = (NULL == deposit->exchange_base_url)
    ? TALER_ARL_exchange_url
    : deposit->exchange_base_url;
  struct TALER_DenominationHashP h_denom_pub;

  /* should be monotonically increasing */
  GNUNET_assert (rowid >= ppp.last_purse_deposits_serial_id);
  ppp.last_purse_deposits_serial_id = rowid + 1;

  {
    const struct TALER_EXCHANGEDB_DenominationKeyInformation *issue;
    enum GNUNET_DB_QueryStatus qs;

    qs = TALER_ARL_get_denomination_info (denom_pub,
                                          &issue,
                                          &h_denom_pub);
    if (0 > qs)
    {
      GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
      if (GNUNET_DB_STATUS_HARD_ERROR == qs)
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Hard database error trying to get denomination %s from database!\n",
                    TALER_B2S (denom_pub));
      pc->qs = qs;
      return GNUNET_SYSERR;
    }
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
    {
      report_row_inconsistency ("purse-deposit",
                                rowid,
                                "denomination key not found");
      if (TALER_ARL_do_abort ())
        return GNUNET_SYSERR;
      return GNUNET_OK;
    }
    TALER_ARL_amount_subtract (&amount_minus_fee,
                               &deposit->amount,
                               &issue->fees.deposit);
  }

  if (GNUNET_OK !=
      TALER_wallet_purse_deposit_verify (base_url,
                                         &deposit->purse_pub,
                                         &deposit->amount,
                                         &h_denom_pub,
                                         &deposit->h_age_commitment,
                                         &deposit->coin_pub,
                                         &deposit->coin_sig))
  {
    TALER_ARL_report (report_bad_sig_losses,
                      GNUNET_JSON_PACK (
                        GNUNET_JSON_pack_string ("operation",
                                                 "purse-deposit"),
                        GNUNET_JSON_pack_uint64 ("row",
                                                 rowid),
                        TALER_JSON_pack_amount ("loss",
                                                &deposit->amount),
                        GNUNET_JSON_pack_data_auto ("key_pub",
                                                    &deposit->coin_pub)));
    TALER_ARL_amount_add (&total_bad_sig_loss,
                          &total_bad_sig_loss,
                          &deposit->amount);
    return GNUNET_OK;
  }

  ps = setup_purse (pc,
                    &deposit->purse_pub);
  if (NULL == ps)
  {
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == pc->qs)
    {
      report_row_inconsistency ("purse-deposit",
                                rowid,
                                "purse not found");
    }
    else
    {
      /* Database trouble!? */
      GNUNET_break (0);
    }
    return GNUNET_SYSERR;
  }
  TALER_ARL_amount_add (&ps->balance,
                        &ps->balance,
                        &amount_minus_fee);
  TALER_ARL_amount_add (&balance.balance,
                        &balance.balance,
                        &amount_minus_fee);
  return GNUNET_OK;
}


/**
 * Function called with details about purse merges that have been made, with
 * the goal of auditing the purse merge execution.
 *
 * @param cls closure
 * @param rowid unique serial ID for the deposit in our DB
 * @param partner_base_url where is the reserve, NULL for this exchange
 * @param amount total amount expected in the purse
 * @param balance current balance in the purse
 * @param flags purse flags
 * @param merge_pub merge capability key
 * @param reserve_pub reserve the merge affects
 * @param merge_sig signature affirming the merge
 * @param purse_pub purse key
 * @param merge_timestamp when did the merge happen
 * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
 */
static enum GNUNET_GenericReturnValue
handle_purse_merged (
  void *cls,
  uint64_t rowid,
  const char *partner_base_url,
  const struct TALER_Amount *amount,
  const struct TALER_Amount *balance,
  enum TALER_WalletAccountMergeFlags flags,
  const struct TALER_PurseMergePublicKeyP *merge_pub,
  const struct TALER_ReservePublicKeyP *reserve_pub,
  const struct TALER_PurseMergeSignatureP *merge_sig,
  const struct TALER_PurseContractPublicKeyP *purse_pub,
  struct GNUNET_TIME_Timestamp merge_timestamp)
{
  struct PurseContext *pc = cls;
  struct PurseSummary *ps;

  /* should be monotonically increasing */
  GNUNET_assert (rowid >= ppp.last_purse_merge_serial_id);
  ppp.last_purse_merge_serial_id = rowid + 1;

  {
    char *reserve_url;

    reserve_url
      = TALER_reserve_make_payto (NULL == partner_base_url
                                ? TALER_ARL_exchange_url
                                : partner_base_url,
                                  reserve_pub);
    if (GNUNET_OK !=
        TALER_wallet_purse_merge_verify (reserve_url,
                                         merge_timestamp,
                                         purse_pub,
                                         merge_pub,
                                         merge_sig))
    {
      GNUNET_free (reserve_url);
      TALER_ARL_report (report_bad_sig_losses,
                        GNUNET_JSON_PACK (
                          GNUNET_JSON_pack_string ("operation",
                                                   "merge-purse"),
                          GNUNET_JSON_pack_uint64 ("row",
                                                   rowid),
                          TALER_JSON_pack_amount ("loss",
                                                  amount),
                          GNUNET_JSON_pack_data_auto ("key_pub",
                                                      merge_pub)));
      TALER_ARL_amount_add (&total_bad_sig_loss,
                            &total_bad_sig_loss,
                            amount);
      return GNUNET_OK;
    }
    GNUNET_free (reserve_url);
  }

  ps = setup_purse (pc,
                    purse_pub);
  if (NULL == ps)
  {
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == pc->qs)
    {
      report_row_inconsistency ("purse-merge",
                                rowid,
                                "purse not found");
    }
    else
    {
      /* Database trouble!? */
      GNUNET_break (0);
    }
    return GNUNET_SYSERR;
  }
  GNUNET_break (0 ==
                GNUNET_TIME_timestamp_cmp (merge_timestamp,
                                           ==,
                                           ps->merge_timestamp));
  TALER_ARL_amount_add (&ps->balance,
                        &ps->balance,
                        amount);
  return GNUNET_OK;
}


/**
 * Function called with details about account merge requests that have been
 * made, with the goal of auditing the account merge execution.
 *
 * @param cls closure
 * @param rowid unique serial ID for the deposit in our DB
 * @param reserve_pub reserve affected by the merge
 * @param purse_pub purse being merged
 * @param h_contract_terms hash over contract of the purse
 * @param purse_expiration when would the purse expire
 * @param amount total amount in the purse
 * @param min_age minimum age of all coins deposited into the purse
 * @param flags how was the purse created
 * @param purse_fee if a purse fee was paid, how high is it
 * @param merge_timestamp when was the merge approved
 * @param reserve_sig signature by reserve approving the merge
 * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
 */
static enum GNUNET_GenericReturnValue
handle_account_merged (
  void *cls,
  uint64_t rowid,
  const struct TALER_ReservePublicKeyP *reserve_pub,
  const struct TALER_PurseContractPublicKeyP *purse_pub,
  const struct TALER_PrivateContractHashP *h_contract_terms,
  struct GNUNET_TIME_Timestamp purse_expiration,
  const struct TALER_Amount *amount,
  uint32_t min_age,
  enum TALER_WalletAccountMergeFlags flags,
  const struct TALER_Amount *purse_fee,
  struct GNUNET_TIME_Timestamp merge_timestamp,
  const struct TALER_ReserveSignatureP *reserve_sig)
{
  struct PurseContext *pc = cls;
  struct PurseSummary *ps;

  /* should be monotonically increasing */
  GNUNET_assert (rowid >= ppp.last_account_merge_serial_id);
  ppp.last_account_merge_serial_id = rowid + 1;
  if (GNUNET_OK !=
      TALER_wallet_account_merge_verify (merge_timestamp,
                                         purse_pub,
                                         purse_expiration,
                                         h_contract_terms,
                                         amount,
                                         purse_fee,
                                         min_age,
                                         flags,
                                         reserve_pub,
                                         reserve_sig))
  {
    TALER_ARL_report (report_bad_sig_losses,
                      GNUNET_JSON_PACK (
                        GNUNET_JSON_pack_string ("operation",
                                                 "account-merge"),
                        GNUNET_JSON_pack_uint64 ("row",
                                                 rowid),
                        TALER_JSON_pack_amount ("loss",
                                                purse_fee),
                        GNUNET_JSON_pack_data_auto ("key_pub",
                                                    reserve_pub)));
    TALER_ARL_amount_add (&total_bad_sig_loss,
                          &total_bad_sig_loss,
                          purse_fee);
    return GNUNET_OK;
  }
  ps = setup_purse (pc,
                    purse_pub);
  if (NULL == ps)
  {
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == pc->qs)
    {
      report_row_inconsistency ("account-merge",
                                rowid,
                                "purse not found");
    }
    else
    {
      /* Database trouble!? */
      GNUNET_break (0);
    }
    return GNUNET_SYSERR;
  }
  TALER_ARL_amount_add (&balance.balance,
                        &balance.balance,
                        purse_fee);
  TALER_ARL_amount_add (&ps->balance,
                        &ps->balance,
                        purse_fee);
  return GNUNET_OK;
}


/**
 * Function called with details about purse decisions that have been made.
 *
 * @param cls closure
 * @param rowid unique serial ID for the deposit in our DB
 * @param purse_pub which purse was the decision made on
 * @param refunded true if decision was to refund
 * @return #GNUNET_OK to continue to iterate, #GNUNET_SYSERR to stop
 */
static enum GNUNET_GenericReturnValue
handle_purse_decision (
  void *cls,
  uint64_t rowid,
  const struct TALER_PurseContractPublicKeyP *purse_pub,
  bool refunded)
{
  struct PurseContext *pc = cls;
  struct PurseSummary *ps;
  struct GNUNET_HashCode key;
  enum GNUNET_DB_QueryStatus qs;
  struct TALER_Amount purse_fee;
  struct TALER_Amount balance_without_purse_fee;

  ps = setup_purse (pc,
                    purse_pub);
  if (NULL == ps)
  {
    if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == pc->qs)
    {
      report_row_inconsistency ("purse-decision",
                                rowid,
                                "purse not found");
    }
    else
    {
      /* Database trouble!? */
      GNUNET_break (0);
    }
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK !=
      get_purse_fee (ps->creation_date,
                     &purse_fee))
  {
    report_row_inconsistency ("purse-request",
                              rowid,
                              "purse fee unavailable");
  }
  if (0 >
      TALER_amount_subtract (&balance_without_purse_fee,
                             &ps->balance,
                             &purse_fee))
  {
    report_row_inconsistency ("purse-request",
                              rowid,
                              "purse fee higher than balance");
    GNUNET_assert (GNUNET_OK ==
                   TALER_amount_set_zero (TALER_ARL_currency,
                                          &balance_without_purse_fee));
  }

  if (refunded)
  {
    if (-1 != TALER_amount_cmp (&balance_without_purse_fee,
                                &ps->total_value))
    {
      report_amount_arithmetic_inconsistency ("purse-decision: refund",
                                              rowid,
                                              &balance_without_purse_fee,
                                              &ps->total_value,
                                              0);
    }
  }
  else
  {
    if (-1 == TALER_amount_cmp (&balance_without_purse_fee,
                                &ps->total_value))
    {
      report_amount_arithmetic_inconsistency ("purse-decision: merge",
                                              rowid,
                                              &ps->total_value,
                                              &balance_without_purse_fee,
                                              0);
      TALER_ARL_amount_add (&total_balance_insufficient_loss,
                            &total_balance_insufficient_loss,
                            &ps->total_value);
    }
  }

  qs = TALER_ARL_adb->delete_purse_info (TALER_ARL_adb->cls,
                                         purse_pub,
                                         &TALER_ARL_master_pub);
  GNUNET_assert (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS != qs);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
    pc->qs = qs;
    return GNUNET_SYSERR;
  }
  GNUNET_CRYPTO_hash (purse_pub,
                      sizeof (*purse_pub),
                      &key);
  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CONTAINER_multihashmap_remove (pc->purses,
                                                       &key,
                                                       ps));
  GNUNET_free (ps);
  return GNUNET_OK;
}


/**
 * Function called on expired purses.
 *
 * @param cls closure
 * @param purse_pub public key of the purse
 * @param balance amount of money in the purse
 * @param expiration_date when did the purse expire?
 * @return #GNUNET_OK to continue to iterate
 */
static enum GNUNET_GenericReturnValue
handle_purse_expired (
  void *cls,
  const struct TALER_PurseContractPublicKeyP *purse_pub,
  const struct TALER_Amount *balance,
  struct GNUNET_TIME_Timestamp expiration_date)
{
  struct PurseContext *pc = cls;

  (void) pc;
  TALER_ARL_report (report_purse_not_closed_inconsistencies,
                    GNUNET_JSON_PACK (
                      GNUNET_JSON_pack_data_auto ("purse_pub",
                                                  purse_pub),
                      TALER_JSON_pack_amount ("balance",
                                              balance),
                      TALER_JSON_pack_time_abs_human ("expired",
                                                      expiration_date.abs_time)));
  TALER_ARL_amount_add (&total_delayed_decisions,
                        &total_delayed_decisions,
                        balance);
  return GNUNET_OK;
}


/**
 * Check that the purse summary matches what the exchange database
 * thinks about the purse, and update our own state of the purse.
 *
 * Remove all purses that we are happy with from the DB.
 *
 * @param cls our `struct PurseContext`
 * @param key hash of the purse public key
 * @param value a `struct PurseSummary`
 * @return #GNUNET_OK to process more entries
 */
static enum GNUNET_GenericReturnValue
verify_purse_balance (void *cls,
                      const struct GNUNET_HashCode *key,
                      void *value)
{
  struct PurseContext *pc = cls;
  struct PurseSummary *ps = value;
  enum GNUNET_GenericReturnValue ret;
  enum GNUNET_DB_QueryStatus qs;

  ret = GNUNET_OK;
  if (internal_checks)
  {
    struct TALER_Amount pf;
    struct TALER_Amount balance_without_purse_fee;

    /* subtract purse fee from ps->balance to get actual balance we expect, as
       we track the balance including purse fee, while the exchange subtracts
       the purse fee early on. */
    if (GNUNET_OK !=
        get_purse_fee (ps->creation_date,
                       &pf))
    {
      GNUNET_break (0);
      report_row_inconsistency ("purse",
                                0,
                                "purse fee unavailable");
    }
    if (0 >
        TALER_amount_subtract (&balance_without_purse_fee,
                               &ps->balance,
                               &pf))
    {
      report_row_inconsistency ("purse",
                                0,
                                "purse fee higher than balance");
      GNUNET_assert (GNUNET_OK ==
                     TALER_amount_set_zero (TALER_ARL_currency,
                                            &balance_without_purse_fee));
    }

    if (0 != TALER_amount_cmp (&ps->exchange_balance,
                               &balance_without_purse_fee))
    {
      report_amount_arithmetic_inconsistency ("purse-balance",
                                              0,
                                              &ps->exchange_balance,
                                              &balance_without_purse_fee,
                                              0);
    }
  }

  if (ps->had_pi)
    qs = TALER_ARL_adb->update_purse_info (TALER_ARL_adb->cls,
                                           &ps->purse_pub,
                                           &TALER_ARL_master_pub,
                                           &ps->balance);
  else
    qs = TALER_ARL_adb->insert_purse_info (TALER_ARL_adb->cls,
                                           &ps->purse_pub,
                                           &TALER_ARL_master_pub,
                                           &ps->balance,
                                           ps->expiration_date);
  GNUNET_assert (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS != qs);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
    pc->qs = qs;
    return GNUNET_SYSERR;
  }

  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CONTAINER_multihashmap_remove (pc->purses,
                                                       key,
                                                       ps));
  GNUNET_free (ps);
  return ret;
}


/**
 * Analyze purses for being well-formed.
 *
 * @param cls NULL
 * @return transaction status code
 */
static enum GNUNET_DB_QueryStatus
analyze_purses (void *cls)
{
  struct PurseContext pc;
  enum GNUNET_DB_QueryStatus qsx;
  enum GNUNET_DB_QueryStatus qs;
  enum GNUNET_DB_QueryStatus qsp;

  (void) cls;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Analyzing purses\n");
  qsp = TALER_ARL_adb->get_auditor_progress_purse (TALER_ARL_adb->cls,
                                                   &TALER_ARL_master_pub,
                                                   &ppp);
  if (0 > qsp)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qsp);
    return qsp;
  }
  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qsp)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
                "First analysis using this auditor, starting audit from scratch\n");
  }
  else
  {
    ppp_start = ppp;
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Resuming purse audit at %llu/%llu/%llu/%llu/%llu\n",
                (unsigned long long) ppp.last_purse_request_serial_id,
                (unsigned long long) ppp.last_purse_decision_serial_id,
                (unsigned long long) ppp.last_purse_merge_serial_id,
                (unsigned long long) ppp.last_purse_deposits_serial_id,
                (unsigned long long) ppp.last_account_merge_serial_id);
  }
  pc.qs = GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
  qsx = TALER_ARL_adb->get_purse_summary (TALER_ARL_adb->cls,
                                          &TALER_ARL_master_pub,
                                          &balance);
  if (qsx < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qsx);
    return qsx;
  }
  pc.purses = GNUNET_CONTAINER_multihashmap_create (512,
                                                    GNUNET_NO);

  qs = TALER_ARL_edb->select_purse_requests_above_serial_id (
    TALER_ARL_edb->cls,
    ppp.last_purse_request_serial_id,
    &handle_purse_requested,
    &pc);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }

  qs = TALER_ARL_edb->select_purse_merges_above_serial_id (
    TALER_ARL_edb->cls,
    ppp.last_purse_merge_serial_id,
    &handle_purse_merged,
    &pc);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }
  qs = TALER_ARL_edb->select_purse_deposits_above_serial_id (
    TALER_ARL_edb->cls,
    ppp.last_purse_deposits_serial_id,
    &handle_purse_deposits,
    &pc);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }
  /* Charge purse fee! */
  qs = TALER_ARL_edb->select_account_merges_above_serial_id (
    TALER_ARL_edb->cls,
    ppp.last_account_merge_serial_id,
    &handle_account_merged,
    &pc);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }

  qs = TALER_ARL_edb->select_all_purse_decisions_above_serial_id (
    TALER_ARL_edb->cls,
    ppp.last_purse_decision_serial_id,
    &handle_purse_decision,
    &pc);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }

  qs = TALER_ARL_adb->select_purse_expired (
    TALER_ARL_adb->cls,
    &TALER_ARL_master_pub,
    &handle_purse_expired,
    &pc);
  if (qs < 0)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }

  GNUNET_CONTAINER_multihashmap_iterate (pc.purses,
                                         &verify_purse_balance,
                                         &pc);
  GNUNET_break (0 ==
                GNUNET_CONTAINER_multihashmap_size (pc.purses));
  GNUNET_CONTAINER_multihashmap_destroy (pc.purses);
  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != pc.qs)
    return qs;
  if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qsx)
  {
    qs = TALER_ARL_adb->insert_purse_summary (TALER_ARL_adb->cls,
                                              &TALER_ARL_master_pub,
                                              &balance);
  }
  else
  {
    qs = TALER_ARL_adb->update_purse_summary (TALER_ARL_adb->cls,
                                              &TALER_ARL_master_pub,
                                              &balance);
  }
  if (0 >= qs)
  {
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }
  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qsp)
    qs = TALER_ARL_adb->update_auditor_progress_purse (TALER_ARL_adb->cls,
                                                       &TALER_ARL_master_pub,
                                                       &ppp);
  else
    qs = TALER_ARL_adb->insert_auditor_progress_purse (TALER_ARL_adb->cls,
                                                       &TALER_ARL_master_pub,
                                                       &ppp);
  if (0 >= qs)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Failed to update auditor DB, not recording progress\n");
    GNUNET_break (GNUNET_DB_STATUS_SOFT_ERROR == qs);
    return qs;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Concluded purse audit step at %llu/%llu/%llu/%llu/%llu\n",
              (unsigned long long) ppp.last_purse_request_serial_id,
              (unsigned long long) ppp.last_purse_decision_serial_id,
              (unsigned long long) ppp.last_purse_merge_serial_id,
              (unsigned long long) ppp.last_purse_deposits_serial_id,
              (unsigned long long) ppp.last_account_merge_serial_id);
  return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
}


/**
 * Main function that will be run.
 *
 * @param cls closure
 * @param args remaining command-line arguments
 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 * @param c configuration
 */
static void
run (void *cls,
     char *const *args,
     const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *c)
{
  (void) cls;
  (void) args;
  (void) cfgfile;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Launching auditor\n");
  if (GNUNET_OK !=
      TALER_ARL_init (c))
  {
    global_ret = EXIT_FAILURE;
    return;
  }
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &balance.balance));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &total_balance_insufficient_loss));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &total_delayed_decisions));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &total_arithmetic_delta_plus));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &total_arithmetic_delta_minus));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &total_balance_purse_not_closed));
  GNUNET_assert (GNUNET_OK ==
                 TALER_amount_set_zero (TALER_ARL_currency,
                                        &total_bad_sig_loss));

  GNUNET_assert (NULL !=
                 (report_row_inconsistencies = json_array ()));
  GNUNET_assert (NULL !=
                 (report_purse_balance_insufficient_inconsistencies
                    = json_array ()));
  GNUNET_assert (NULL !=
                 (report_purse_not_closed_inconsistencies
                    = json_array ()));
  GNUNET_assert (NULL !=
                 (report_amount_arithmetic_inconsistencies
                    = json_array ()));
  GNUNET_assert (NULL !=
                 (report_bad_sig_losses = json_array ()));
  if (GNUNET_OK !=
      TALER_ARL_setup_sessions_and_run (&analyze_purses,
                                        NULL))
  {
    global_ret = EXIT_FAILURE;
    return;
  }
  TALER_ARL_done (
    GNUNET_JSON_PACK (
      /* Globals (REVIEW!) */
      TALER_JSON_pack_amount ("total_balance_insufficient",
                              &total_balance_insufficient_loss),
      TALER_JSON_pack_amount ("total_delayed_purse_decisions",
                              &total_delayed_decisions),
      GNUNET_JSON_pack_array_steal (
        "purse_balance_insufficient_inconsistencies",
        report_purse_balance_insufficient_inconsistencies),
      TALER_JSON_pack_amount ("total_balance_purse_not_closed",
                              &total_balance_purse_not_closed),
      TALER_JSON_pack_amount ("total_bad_sig_loss",
                              &total_bad_sig_loss),
      TALER_JSON_pack_amount ("total_arithmetic_delta_plus",
                              &total_arithmetic_delta_plus),
      TALER_JSON_pack_amount ("total_arithmetic_delta_minus",
                              &total_arithmetic_delta_minus),

      /* Global 'balances' */
      TALER_JSON_pack_amount ("total_purse_balance",
                              &balance.balance),
      GNUNET_JSON_pack_uint64 ("total_purse_count",
                               balance.open_purses),

      GNUNET_JSON_pack_array_steal ("purse_not_closed_inconsistencies",
                                    report_purse_not_closed_inconsistencies),
      GNUNET_JSON_pack_array_steal ("bad_sig_losses",
                                    report_bad_sig_losses),
      GNUNET_JSON_pack_array_steal ("row_inconsistencies",
                                    report_row_inconsistencies),
      GNUNET_JSON_pack_array_steal ("amount_arithmetic_inconsistencies",
                                    report_amount_arithmetic_inconsistencies),
      /* Information about audited range ... */
      TALER_JSON_pack_time_abs_human ("auditor_start_time",
                                      start_time),
      TALER_JSON_pack_time_abs_human ("auditor_end_time",
                                      GNUNET_TIME_absolute_get ()),
      GNUNET_JSON_pack_uint64 ("start_ppp_purse_merges_serial_id",
                               ppp_start.last_purse_merge_serial_id),
      GNUNET_JSON_pack_uint64 ("start_ppp_purse_deposits_serial_id",
                               ppp_start.last_purse_deposits_serial_id),
      GNUNET_JSON_pack_uint64 ("start_ppp_account_merge_serial_id",
                               ppp_start.last_account_merge_serial_id),
      GNUNET_JSON_pack_uint64 ("end_ppp_purse_merges_serial_id",
                               ppp.last_purse_merge_serial_id),
      GNUNET_JSON_pack_uint64 ("end_ppp_purse_deposits_serial_id",
                               ppp.last_purse_deposits_serial_id),
      GNUNET_JSON_pack_uint64 ("end_ppp_account_merge_serial_id",
                               ppp.last_account_merge_serial_id)));
}


/**
 * The main function to check the database's handling of purses.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc,
      char *const *argv)
{
  const struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_flag ('i',
                               "internal",
                               "perform checks only applicable for exchange-internal audits",
                               &internal_checks),
    GNUNET_GETOPT_option_base32_auto ('m',
                                      "exchange-key",
                                      "KEY",
                                      "public key of the exchange (Crockford base32 encoded)",
                                      &TALER_ARL_master_pub),
    GNUNET_GETOPT_option_timetravel ('T',
                                     "timetravel"),
    GNUNET_GETOPT_OPTION_END
  };
  enum GNUNET_GenericReturnValue ret;

  /* force linker to link against libtalerutil; if we do
     not do this, the linker may "optimize" libtalerutil
     away and skip #TALER_OS_init(), which we do need */
  (void) TALER_project_data_default ();
  if (GNUNET_OK !=
      GNUNET_STRINGS_get_utf8_args (argc, argv,
                                    &argc, &argv))
    return EXIT_INVALIDARGUMENT;
  ret = GNUNET_PROGRAM_run (
    argc,
    argv,
    "taler-helper-auditor-purses",
    gettext_noop ("Audit Taler exchange purse handling"),
    options,
    &run,
    NULL);
  GNUNET_free_nz ((void *) argv);
  if (GNUNET_SYSERR == ret)
    return EXIT_INVALIDARGUMENT;
  if (GNUNET_NO == ret)
    return EXIT_SUCCESS;
  return global_ret;
}


/* end of taler-helper-auditor-purses.c */