summaryrefslogtreecommitdiff
path: root/src/auditor/taler-auditor-sync.c
blob: 84562c5b2e591e70de6fd026daceb948336320e2 (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
/*
  This file is part of TALER
  Copyright (C) 2020 Taler Systems SA

  TALER 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.

  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 General Public License for more details.

  You should have received a copy of the GNU General Public License along with
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
*/
/**
 * @file taler-auditor-sync.c
 * @brief Tool used by the auditor to make a 'safe' copy of the exchanges' database.
 * @author Christian Grothoff
 */
#include <platform.h>
#include "taler_exchangedb_lib.h"


/**
 * Handle to access the exchange's source database.
 */
static struct TALER_EXCHANGEDB_Plugin *src;

/**
 * Handle to access the exchange's destination database.
 */
static struct TALER_EXCHANGEDB_Plugin *dst;

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

/**
 * Main task to do synchronization.
 */
static struct GNUNET_SCHEDULER_Task *sync_task;

/**
 * What is our target transaction size (number of records)?
 */
static unsigned int transaction_size = 512;

/**
 * Number of records copied in this transaction.
 */
static unsigned long long actual_size;

/**
 * Terminate once synchronization is achieved.
 */
static int exit_if_synced;


/**
 * Information we track per replicated table.
 */
struct Table
{
  /**
   * Which table is this record about?
   */
  enum TALER_EXCHANGEDB_ReplicatedTable rt;

  /**
   * Up to which record is the destination table synchronized.
   */
  uint64_t start_serial;

  /**
   * Highest serial in the source table.
   */
  uint64_t end_serial;

  /**
   * Marker for the end of the list of #tables.
   */
  bool end;
};


/**
 * Information about replicated tables.
 */
static struct Table tables[] = {
  { .rt = TALER_EXCHANGEDB_RT_DENOMINATIONS},
  { .rt = TALER_EXCHANGEDB_RT_DENOMINATION_REVOCATIONS},
  { .rt = TALER_EXCHANGEDB_RT_RESERVES},
  { .rt = TALER_EXCHANGEDB_RT_RESERVES_IN},
  { .rt = TALER_EXCHANGEDB_RT_RESERVES_CLOSE},
  { .rt = TALER_EXCHANGEDB_RT_RESERVES_OUT},
  { .rt = TALER_EXCHANGEDB_RT_AUDITORS},
  { .rt = TALER_EXCHANGEDB_RT_AUDITOR_DENOM_SIGS},
  { .rt = TALER_EXCHANGEDB_RT_EXCHANGE_SIGN_KEYS},
  { .rt = TALER_EXCHANGEDB_RT_SIGNKEY_REVOCATIONS},
  { .rt = TALER_EXCHANGEDB_RT_KNOWN_COINS},
  { .rt = TALER_EXCHANGEDB_RT_REFRESH_COMMITMENTS},
  { .rt = TALER_EXCHANGEDB_RT_REFRESH_REVEALED_COINS},
  { .rt = TALER_EXCHANGEDB_RT_REFRESH_TRANSFER_KEYS},
  { .rt = TALER_EXCHANGEDB_RT_DEPOSITS},
  { .rt = TALER_EXCHANGEDB_RT_REFUNDS},
  { .rt = TALER_EXCHANGEDB_RT_WIRE_OUT},
  { .rt = TALER_EXCHANGEDB_RT_AGGREGATION_TRACKING},
  { .rt = TALER_EXCHANGEDB_RT_WIRE_FEE},
  { .rt = TALER_EXCHANGEDB_RT_RECOUP},
  { .rt = TALER_EXCHANGEDB_RT_RECOUP_REFRESH },
  { .end = true }
};


/**
 * Closure for #do_insert.
 */
struct InsertContext
{
  /**
   * Database session to use.
   */
  struct TALER_EXCHANGEDB_Session *ds;

  /**
   * Table we are replicating.
   */
  struct Table *table;

  /**
   * Set to error if insertion created an error.
   */
  enum GNUNET_DB_QueryStatus qs;
};


/**
 * Function called on data to replicate in the auditor's database.
 *
 * @param cls closure, a `struct InsertContext`
 * @param td record from an exchange table
 * @return #GNUNET_OK to continue to iterate,
 *         #GNUNET_SYSERR to fail with an error
 */
static int
do_insert (void *cls,
           const struct TALER_EXCHANGEDB_TableData *td)
{
  struct InsertContext *ctx = cls;
  enum GNUNET_DB_QueryStatus qs;

  if (0 >= ctx->qs)
    return GNUNET_SYSERR;
  qs = dst->insert_records_by_table (dst->cls,
                                     ctx->ds,
                                     td);
  if (0 >= qs)
  {
    switch (qs)
    {
    case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
      GNUNET_assert (0);
      break;
    case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  "Failed to insert record into table %d: no change\n",
                  td->table);
      break;
    case GNUNET_DB_STATUS_SOFT_ERROR:
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                  "Serialization error inserting record into table %d (will retry)\n",
                  td->table);
      break;
    case GNUNET_DB_STATUS_HARD_ERROR:
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Failed to insert record into table %d: hard error\n",
                  td->table);
      break;
    }
    ctx->qs = qs;
    return GNUNET_SYSERR;
  }
  actual_size++;
  ctx->table->start_serial = td->serial;
  return GNUNET_OK;
}


/**
 * Run one replication transaction.
 *
 * @return #GNUNET_OK on success, #GNUNET_SYSERR to rollback
 */
static int
transact (struct TALER_EXCHANGEDB_Session *ss,
          struct TALER_EXCHANGEDB_Session *ds)
{
  struct InsertContext ctx = {
    .ds = ds,
    .qs = GNUNET_DB_STATUS_SUCCESS_ONE_RESULT
  };

  if (0 >
      src->start (src->cls,
                  ss,
                  "lookup src serials"))
    return GNUNET_SYSERR;
  for (unsigned int i = 0; ! tables[i].end; i++)
    src->lookup_serial_by_table (src->cls,
                                 ss,
                                 tables[i].rt,
                                 &tables[i].end_serial);
  if (0 >
      src->commit (src->cls,
                   ss))
    return GNUNET_SYSERR;
  if (GNUNET_OK !=
      dst->start (src->cls,
                  ds,
                  "lookup dst serials"))
    return GNUNET_SYSERR;
  for (unsigned int i = 0; ! tables[i].end; i++)
    dst->lookup_serial_by_table (dst->cls,
                                 ds,
                                 tables[i].rt,
                                 &tables[i].start_serial);
  if (0 >
      dst->commit (dst->cls,
                   ds))
    return GNUNET_SYSERR;
  for (unsigned int i = 0; ! tables[i].end; i++)
  {
    struct Table *table = &tables[i];

    if (table->start_serial == table->end_serial)
      continue;
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Replicating table %d from %llu to %llu\n",
                i,
                (unsigned long long) table->start_serial,
                (unsigned long long) table->end_serial);
    ctx.table = table;
    while (table->start_serial < table->end_serial)
    {
      enum GNUNET_DB_QueryStatus qs;

      if (GNUNET_OK !=
          src->start (src->cls,
                      ss,
                      "copy table (src)"))
        return GNUNET_SYSERR;
      if (GNUNET_OK !=
          dst->start (dst->cls,
                      ds,
                      "copy table (dst)"))
        return GNUNET_SYSERR;
      qs = src->lookup_records_by_table (src->cls,
                                         ss,
                                         table->rt,
                                         table->start_serial,
                                         &do_insert,
                                         &ctx);
      if (ctx.qs < 0)
        qs = ctx.qs;
      if (GNUNET_DB_STATUS_HARD_ERROR == qs)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Failed to lookup records from table %d: hard error\n",
                    i);
        global_ret = 3;
        return GNUNET_SYSERR;
      }
      if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Serialization error looking up records from table %d (will retry)\n",
                    i);
        return GNUNET_SYSERR; /* will retry */
      }
      if (0 == qs)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Failed to lookup records from table %d: no results\n",
                    i);
        GNUNET_break (0); /* should be impossible */
        global_ret = 4;
        return GNUNET_SYSERR;
      }
      if (0 == ctx.qs)
        return GNUNET_SYSERR; /* insertion failed, maybe record existed? try again */
      src->rollback (src->cls,
                     ss);
      qs = dst->commit (dst->cls,
                        ds);
      if (GNUNET_DB_STATUS_SOFT_ERROR == qs)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                    "Serialization error committing transaction on table %d (will retry)\n",
                    i);
        continue;
      }
      if (GNUNET_DB_STATUS_HARD_ERROR == qs)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Hard error committing transaction on table %d\n",
                    i);
        global_ret = 5;
        return GNUNET_SYSERR;
      }
    }
  }
  /* we do not care about conflicting UPDATEs to src table, so safe to just rollback */
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Sync pass completed successfully with %llu updates\n",
              actual_size);
  return GNUNET_OK;
}


/**
 * Task to do the actual synchronization work.
 *
 * @param cls NULL, unused
 */
static void
do_sync (void *cls)
{
  struct GNUNET_TIME_Relative delay;
  struct TALER_EXCHANGEDB_Session *ss;
  struct TALER_EXCHANGEDB_Session *ds;

  sync_task = NULL;
  actual_size = 0;
  ss = src->get_session (src->cls);
  if (NULL == ss)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to begin transaction with data source. Exiting\n");
    return;
  }
  ds = dst->get_session (dst->cls);
  if (NULL == ds)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to begin transaction with data destination. Exiting\n");
    return;
  }
  if (GNUNET_OK !=
      transact (ss,
                ds))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Transaction failed, rolling back\n");
    src->rollback (src->cls,
                   ss);
    dst->rollback (dst->cls,
                   ds);
  }
  if (0 != global_ret)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Transaction failed permanently, exiting\n");
    return;
  }
  if ( (0 == actual_size) &&
       (exit_if_synced) )
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Databases are synchronized. Exiting\n");
    return;
  }
  if (actual_size < transaction_size / 2)
  {
    delay = GNUNET_TIME_STD_BACKOFF (delay);
  }
  else if (actual_size >= transaction_size)
  {
    delay = GNUNET_TIME_UNIT_ZERO;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Next sync pass in %s\n",
              GNUNET_STRINGS_relative_time_to_string (delay,
                                                      GNUNET_YES));
  sync_task = GNUNET_SCHEDULER_add_delayed (delay,
                                            &do_sync,
                                            NULL);
}


/**
 * Set an option of type 'char *' from the command line with
 * filename expansion a la #GNUNET_STRINGS_filename_expand().
 *
 * @param ctx command line processing context
 * @param scls additional closure (will point to the `char *`,
 *             which will be allocated)
 * @param option name of the option
 * @param value actual value of the option (a string)
 * @return #GNUNET_OK
 */
static int
set_filename (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
              void *scls,
              const char *option,
              const char *value)
{
  char **val = scls;

  (void) ctx;
  (void) option;
  GNUNET_assert (NULL != value);
  GNUNET_free (*val);
  *val = GNUNET_STRINGS_filename_expand (value);
  return GNUNET_OK;
}


/**
 * Allow user to specify configuration file name (-s option)
 *
 * @param[out] fn set to the name of the configuration file
 */
static struct GNUNET_GETOPT_CommandLineOption
option_cfgfile_src (char **fn)
{
  struct GNUNET_GETOPT_CommandLineOption clo = {
    .shortName = 's',
    .name = "source-configuration",
    .argumentHelp = "FILENAME",
    .description = gettext_noop (
      "use configuration file FILENAME for the SOURCE database"),
    .require_argument = 1,
    .processor = &set_filename,
    .scls = (void *) fn
  };

  return clo;
}


/**
 * Allow user to specify configuration file name (-d option)
 *
 * @param[out] fn set to the name of the configuration file
 */
static struct GNUNET_GETOPT_CommandLineOption
option_cfgfile_dst (char **fn)
{
  struct GNUNET_GETOPT_CommandLineOption clo = {
    .shortName = 'd',
    .name = "destination-configuration",
    .argumentHelp = "FILENAME",
    .description = gettext_noop (
      "use configuration file FILENAME for the DESTINATION database"),
    .require_argument = 1,
    .processor = &set_filename,
    .scls = (void *) fn
  };

  return clo;
}


static struct GNUNET_CONFIGURATION_Handle *
load_config (const char *cfgfile)
{
  struct GNUNET_CONFIGURATION_Handle *cfg;

  cfg = GNUNET_CONFIGURATION_create ();
  GNUNET_log (GNUNET_ERROR_TYPE_INFO,
              "Loading config file: %s\n",
              cfgfile);
  if (GNUNET_SYSERR ==
      GNUNET_CONFIGURATION_load (cfg,
                                 cfgfile))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Malformed configuration file `%s', exit ...\n",
                cfgfile);
    GNUNET_CONFIGURATION_destroy (cfg);
    return NULL;
  }
  return cfg;
}


/**
 * Shutdown task.
 *
 * @param cls NULL, unused
 */
static void
do_shutdown (void *cls)
{
  if (NULL != sync_task)
  {
    GNUNET_SCHEDULER_cancel (sync_task);
    sync_task = NULL;
  }
}


/**
 * Initial task.
 *
 * @param cls NULL, unused
 */
static void
run (void *cls)
{
  (void) cls;

  GNUNET_SCHEDULER_add_shutdown (&do_shutdown,
                                 NULL);
  sync_task = GNUNET_SCHEDULER_add_now (&do_sync,
                                        NULL);
}


/**
 * Setup plugins in #src and #dst and #run() the main
 * logic with those plugins.
 */
static void
setup (struct GNUNET_CONFIGURATION_Handle *src_cfg,
       struct GNUNET_CONFIGURATION_Handle *dst_cfg)
{
  src = TALER_EXCHANGEDB_plugin_load (src_cfg);
  if (NULL == src)
  {
    global_ret = 3;
    return;
  }
  dst = TALER_EXCHANGEDB_plugin_load (dst_cfg);
  if (NULL == dst)
  {
    global_ret = 3;
    TALER_EXCHANGEDB_plugin_unload (src);
    src = NULL;
    return;
  }
  GNUNET_SCHEDULER_run (&run,
                        NULL);
  TALER_EXCHANGEDB_plugin_unload (src);
  src = NULL;
  TALER_EXCHANGEDB_plugin_unload (dst);
  dst = NULL;
}


/**
 * The main function of the taler-auditor-exchange tool.  This tool is used
 * to add (or remove) an exchange's master key and base URL to the auditor's
 * database.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, non-zero on error
 */
int
main (int argc,
      char *const *argv)
{
  char *src_cfgfile = NULL;
  char *dst_cfgfile = NULL;
  char *level = GNUNET_strdup ("WARNING");
  struct GNUNET_CONFIGURATION_Handle *src_cfg;
  struct GNUNET_CONFIGURATION_Handle *dst_cfg;
  const struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_mandatory (
      option_cfgfile_src (&src_cfgfile)),
    GNUNET_GETOPT_option_mandatory (
      option_cfgfile_dst (&dst_cfgfile)),
    GNUNET_GETOPT_option_help (
      gettext_noop ("Make a safe copy of an exchange database")),
    GNUNET_GETOPT_option_uint (
      'b',
      "batch",
      "SIZE",
      gettext_noop (
        "target SIZE for a the number of records to copy in one transaction"),
      &transaction_size),
    GNUNET_GETOPT_option_flag (
      't',
      "terminate-when-synchronized",
      gettext_noop (
        "terminate as soon as the databases are synchronized"),
      &exit_if_synced),
    GNUNET_GETOPT_option_version (VERSION "-" VCS_VERSION),
    GNUNET_GETOPT_option_loglevel (&level),
    GNUNET_GETOPT_OPTION_END
  };

  TALER_gcrypt_init (); /* must trigger initialization manually at this point! */
  {
    int ret;

    ret = GNUNET_GETOPT_run ("taler-auditor-sync",
                             options,
                             argc, argv);
    if (GNUNET_NO == ret)
      return 0;
    if (GNUNET_SYSERR == ret)
      return 1;
  }
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_log_setup ("taler-auditor-sync",
                                   level,
                                   NULL));
  GNUNET_free (level);
  if (0 == strcmp (src_cfgfile,
                   dst_cfgfile))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Source and destination configuration files must differ!\n");
    return 1;
  }
  src_cfg = load_config (src_cfgfile);
  if (NULL == src_cfg)
  {
    GNUNET_free (src_cfgfile);
    GNUNET_free (dst_cfgfile);
    return 1;
  }
  dst_cfg = load_config (dst_cfgfile);
  if (NULL == dst_cfg)
  {
    GNUNET_CONFIGURATION_destroy (src_cfg);
    GNUNET_free (src_cfgfile);
    GNUNET_free (dst_cfgfile);
    return 1;
  }
  setup (src_cfg,
         dst_cfg);
  GNUNET_CONFIGURATION_destroy (src_cfg);
  GNUNET_CONFIGURATION_destroy (dst_cfg);
  GNUNET_free (src_cfgfile);
  GNUNET_free (dst_cfgfile);

  return global_ret;
}


/* end of taler-auditor-sync.c */