aboutsummaryrefslogtreecommitdiff
path: root/src/benchmark/taler-exchange-benchmark.c
blob: a7b2e282f239285d369519920dae89bf8eae08f2 (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
/*
  This file is part of TALER
  (C) 2014-2018 Taler Systems SA

  TALER is free software; you can redistribute it and/or modify it
  under the terms of the GNU Affero 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 merchant/backend/taler-merchant-httpd.c
 * @brief HTTP serving layer intended to perform crypto-work and
 * communication with the exchange
 * @author Marcello Stanisci
 */

#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
#include <microhttpd.h>
#include "taler_util.h"
#include "taler_signatures.h"
#include "taler_exchange_service.h"
#include "taler_json_lib.h"
#include "taler_bank_service.h"
#include "taler_fakebank_lib.h"
#include "taler_testing_lib.h"
#include "taler_testing_bank_lib.h"
#include "taler_error_codes.h"

/* Error codes.  */
enum BenchmarkError {
  MISSING_BANK_URL,
  FAILED_TO_LAUNCH_BANK,
  BAD_CLI_ARG,
  BAD_CONFIG_FILE,
  NO_CONFIG_FILE_GIVEN
};


/**
 * Probability that a spent coin will be refreshed.
 */
#define REFRESH_PROBABILITY 0.1

/**
 * The whole benchmark is a repetition of a "unit".  Each
 * unit is a array containing a withdraw+deposit operation,
 * and _possibly_ a refresh of the deposited coin.
 */
#define UNITY_SIZE 6

/**
 * Account number of the merchant.  Fakebank likes any number,
 * the only requirement is that this number then matches the
 * number given when building payto URLs at deposit time.
 */
#define USER_ACCOUNT_NUMBER 3

#define FIRST_INSTRUCTION -1

#define CMD_TRANSFER_TO_EXCHANGE(label,amount) \
   TALER_TESTING_cmd_fakebank_transfer (label, amount, \
     exchange_bank_account.bank_base_url, \
     USER_ACCOUNT_NUMBER, \
     exchange_bank_account.no, \
     "dummy_user", \
     "dummy_password", \
     "http://example.com/")

/**
 * Information about an account extracted from a payto://-URL.
 */
struct Account
{
  /**
   * Hostname of the bank (possibly including port).
   */
  char *hostname;

  /**
   * Bank account number.
   */
  unsigned long long no;

  /**
   * Base URL of the bank hosting the account above.
   */
  char *bank_base_url;
};


/**
 * Hold information regarding which bank has the exchange account.
 */
static struct Account exchange_bank_account;

/**
 * Time snapshot taken right before executing the CMDs.
 */
static struct GNUNET_TIME_Absolute start_time;

/**
 * Benchmark duration time taken right after the CMD interpreter
 * returns.
 */
static struct GNUNET_TIME_Relative duration;

/**
 * Exit code.
 */
static unsigned int result;

/**
 * How many refreshes got executed.
 */
static unsigned int howmany_refreshes;

/**
 * How many coins we want to create.
 */
static unsigned int howmany_coins = 1;

/**
 * How many clients we want to create.
 */
static unsigned int howmany_clients = 1;

/**
 * Log level used during the run.
 */
static char *loglev;

/**
 * Log file.
 */
static char *logfile;

/**
 * Config filename.
 */
static char *cfg_filename;

/**
 * Currency used.
 */
static char *currency;

/**
 * Convenience macros to allocate all the currency-dependant
 * strings;  note that the argument list of the macro is ignored.
 * It is kept as a way to make the macro more auto-descriptive
 * where it is called.
 */
#define ALLOCATE_AMOUNTS(...) \
  char *AMOUNT_5; \
  char *AMOUNT_4; \
  char *AMOUNT_1; \
  \
  GNUNET_asprintf (&AMOUNT_5, \
                   "%s:5", \
                   currency); \
  GNUNET_asprintf (&AMOUNT_4, \
                   "%s:4", \
                   currency); \
  GNUNET_asprintf (&AMOUNT_1, \
                   "%s:1", \
                   currency);

/**
 * Decide which exchange account is going to be
 * used to address a wire transfer to.  Used at
 * withdrawal time.
 *
 * @param cls closure
 * @param section section name.
 */
static void
pick_exchange_account_cb (void *cls,
                          const char *section)
{
  if (0 == strncasecmp ("account-",
                         section,
                        strlen ("account-")))
  {
    const char **s = cls;
    *s = section;
  }
}


/**
 * Parse payto:// account URL (only account information,
 * wire subject and amount are ignored).
 *
 * @param account_url URL to parse
 * @param account[out] set to information, can be NULL
 * @return #TALER_EC_NONE if @a account_url is well-formed
 */
static enum TALER_ErrorCode
parse_payto (const char *account_url,
             struct Account *account)
{
  const char *hostname;
  const char *a;
  const char *q;
  unsigned long long no;

#define PREFIX "payto://x-taler-bank/"
#define MAX_ACCOUNT_NO (1LLU << 52)

  if (0 != strncasecmp (account_url,
                        PREFIX,
                        strlen (PREFIX)))
    return TALER_EC_PAYTO_WRONG_METHOD;
  hostname = &account_url[strlen (PREFIX)];
  if (NULL == (a = strchr (hostname,
                           (unsigned char) '/')))
    return TALER_EC_PAYTO_MALFORMED;
  a++;
  if (NULL != (q = strchr (a,
                           (unsigned char) '?')))
  {
    char *s;

    s = GNUNET_strndup (a,
                        q - a);
    if (1 != sscanf (s,
                     "%llu",
                     &no))
    {
      GNUNET_free (s);
      return TALER_EC_PAYTO_MALFORMED;
    }
    GNUNET_free (s);
  }
  else
  {
    if (1 != sscanf (a,
                     "%llu",
                     &no))
      return TALER_EC_PAYTO_MALFORMED;
  }
  if (no > MAX_ACCOUNT_NO)
    return TALER_EC_PAYTO_MALFORMED;

  if (NULL != account)
  {
    long long unsigned port;
    char *p;

    /* the "-1" crops the final slash away.  */
    account->hostname = GNUNET_strndup (hostname,
                                        a - hostname - 1);
    account->no = no;
    port = 443; /* if non given, equals 443.  */
    if (NULL != (p = strchr (account->hostname,
                           (unsigned char) ':')))
    {
      p++;
      if (1 != sscanf (p,
                       "%llu",
                       &port))
      {
        GNUNET_break (0);
        TALER_LOG_ERROR ("Malformed host from payto:// URI\n");
        GNUNET_free (account->hostname);
        return TALER_EC_PAYTO_MALFORMED;
      }
    }
    if (443 != port)
    {
      GNUNET_assert
        (GNUNET_SYSERR != GNUNET_asprintf
          (&account->bank_base_url,
           "http://%s",
           account->hostname));
    }
    else
    {
      GNUNET_assert
        (GNUNET_SYSERR != GNUNET_asprintf
          (&account->bank_base_url,
           "https://%s",
           account->hostname));
    }
  }
  return TALER_EC_NONE;
}


/**
 * Throw a weighted coin with @a probability.
 *
 * @return #GNUNET_OK with @a probability,
 *         #GNUNET_NO with 1 - @a probability
 */
static unsigned int
eval_probability (float probability)
{
  uint64_t random;
  float random_01;

  random = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
				     UINT64_MAX);
  random_01 = (double) random / UINT64_MAX;
  return (random_01 <= probability) ? GNUNET_OK : GNUNET_NO;
}


/**
 * Actual commands collection.
 */
static void
run (void *cls,
     struct TALER_TESTING_Interpreter *is)
{
  struct TALER_Amount total_reserve_amount;
  struct TALER_Amount withdraw_fee;
  char *withdraw_fee_str;

  struct TALER_TESTING_Command all_commands
    [1 + /* Withdraw block */
     howmany_coins + /* All units */
     1 /* End CMD */];

  ALLOCATE_AMOUNTS
    (AMOUNT_5,
     AMOUNT_4,
     AMOUNT_1);

  total_reserve_amount.value = 5 * howmany_coins;
  total_reserve_amount.fraction = 0;
  strncpy (total_reserve_amount.currency,
           currency,
           TALER_CURRENCY_LEN);

  GNUNET_asprintf (&withdraw_fee_str,
                   "%s:0.1",
                   currency);
  TALER_string_to_amount (withdraw_fee_str,
                          &withdraw_fee);
  for (unsigned int i = 0; i < howmany_coins; i++)
    TALER_amount_add (&total_reserve_amount,
                      &total_reserve_amount,
                      &withdraw_fee);

  struct TALER_TESTING_Command make_reserve[] = {

    CMD_TRANSFER_TO_EXCHANGE
      ("create-reserve",
       TALER_amount_to_string (&total_reserve_amount)),

    TALER_TESTING_cmd_exec_wirewatch
      ("wirewatch",
       cfg_filename),

    TALER_TESTING_cmd_end ()

  };

  all_commands[0] = TALER_TESTING_cmd_batch ("make-reserve",
                                             make_reserve);
  for (unsigned int i = 0; i < howmany_coins; i++)
  {
    char *withdraw_label;
    char *order_enc;
    struct TALER_TESTING_Command unit[UNITY_SIZE];

    GNUNET_asprintf (&withdraw_label,
                     "withdraw-%u",
                     i);

    GNUNET_asprintf (&order_enc,
                     "{\"nonce\": %u}",
                     i);

    unit[0] = TALER_TESTING_cmd_withdraw_amount
      (withdraw_label,
       is->exchange,
       "create-reserve",
       AMOUNT_5,
       MHD_HTTP_OK);

    unit[1] = TALER_TESTING_cmd_deposit
      ("deposit",
       is->exchange,
       withdraw_label,
       0, /* Index of the one withdrawn coin in the traits.  */
       TALER_TESTING_make_wire_details
         (USER_ACCOUNT_NUMBER,
          exchange_bank_account.hostname),
       order_enc,
       GNUNET_TIME_UNIT_ZERO,
       AMOUNT_1,
       MHD_HTTP_OK);

    if (eval_probability (REFRESH_PROBABILITY))
    {
      char *melt_label;
      char *reveal_label;

      howmany_refreshes++;
      GNUNET_asprintf (&melt_label,
                       "refresh-melt-%u",
                       i);

      GNUNET_asprintf (&reveal_label,
                       "refresh-reveal-%u",
                       i);

      unit[2] = TALER_TESTING_cmd_refresh_melt
        (melt_label,
         is->exchange,
         AMOUNT_4,
         withdraw_label,
         MHD_HTTP_OK);

      unit[3] = TALER_TESTING_cmd_refresh_reveal
        (reveal_label,
         is->exchange,
         melt_label,
         MHD_HTTP_OK);

      unit[4] = TALER_TESTING_cmd_refresh_link
        ("refresh-link",
         is->exchange,
         reveal_label,
         MHD_HTTP_OK);

      unit[5] = TALER_TESTING_cmd_end ();
    }
    else unit[2] = TALER_TESTING_cmd_end ();

    all_commands[1 + i] = TALER_TESTING_cmd_batch ("unit",
                                                   unit);
  }
  all_commands[1 + howmany_coins] = TALER_TESTING_cmd_end ();
  start_time = GNUNET_TIME_absolute_get ();
  TALER_TESTING_run_with_fakebank
    (is,
     all_commands,
     exchange_bank_account.bank_base_url);
  result = 1;
}


/**
 * Run the benchmark in parallel in many (client) processes
 * and summarize result.
 *
 * @param main_cb main function to run per process
 * @param main_cb_cls closure for @a main_cb
 * @param config_file configuration file to use
 * @param exchange_url exchange URL to use
 * @return #GNUNET_OK on success
 */
static int
parallel_benchmark (TALER_TESTING_Main main_cb,
                    void *main_cb_cls,
                    const char *config_file,
                    const char *exchange_url)
{
  int result;
  pid_t cpids[howmany_clients];
  int wstatus;

  result = GNUNET_OK;
  for (unsigned int i=0;i<howmany_clients;i++)
  {
    if (0 == (cpids[i] = fork ()))
    {
      /* I am the child, do the work! */
      result = TALER_TESTING_setup_with_exchange
        (run,
         NULL,
         cfg_filename);
      if (GNUNET_OK == result)
        exit (0);
      else
        exit (1);
    }
    if (-1 == cpids[i])
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
                           "fork");
      howmany_clients = i;
      result = GNUNET_SYSERR;
      break;
    }
    /* fork() success, continue starting more processes! */
  }
  /* collect all children */
  for (unsigned int i=0;i<howmany_clients;i++)
  {
    waitpid (cpids[i],
             &wstatus,
             0);
    if ( (!WIFEXITED (wstatus)) ||
         (0 != WEXITSTATUS (wstatus)) )
      result = GNUNET_SYSERR;
  }
  return result;
}


/**
 * The main function of the serve tool
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, or `enum PaymentGeneratorError` on error
 */
int
main (int argc,
      char *const *argv)
{
  char *exchange_url;
  struct GNUNET_OS_Process *compute_wire_response;
  struct GNUNET_CONFIGURATION_Handle *cfg;
  struct GNUNET_GETOPT_CommandLineOption options[] = {
    GNUNET_GETOPT_option_mandatory
    (GNUNET_GETOPT_option_cfgfile (&cfg_filename)),
    GNUNET_GETOPT_option_version (PACKAGE_VERSION " " VCS_VERSION),
    GNUNET_GETOPT_option_help ("Exchange benchmark"),
    GNUNET_GETOPT_option_loglevel (&loglev),
    GNUNET_GETOPT_option_uint ('n',
                               "coins-number",
                               "CN",
                               "How many coins we should instantiate",
                               &howmany_coins),
    GNUNET_GETOPT_option_uint ('p',
                               "parallelism",
                               "NPROCS",
                               "How many client processes we should run",
                               &howmany_clients),
    GNUNET_GETOPT_option_string ('l',
                                 "logfile",
                                 "LF",
                                 "will log to file LF",
                                 &logfile),
    GNUNET_GETOPT_OPTION_END
  };

  unsetenv ("XDG_DATA_HOME");
  unsetenv ("XDG_CONFIG_HOME");
  if (GNUNET_SYSERR ==
      (result = GNUNET_GETOPT_run ("taler-exchange-benchmark",
                                   options,
                                   argc,
                                   argv)))
  {
    TALER_LOG_ERROR ("Unparsable CLI options\n");
    return BAD_CLI_ARG;
  }
  GNUNET_log_setup ("taler-exchange-benchmark",
                    NULL == loglev ? "INFO" : loglev,
                    logfile);
  cfg = GNUNET_CONFIGURATION_create ();
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_load (cfg,
                                 cfg_filename))
  {
    TALER_LOG_ERROR ("Could not parse configuration\n");
    return BAD_CONFIG_FILE;
  }
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_string (cfg,
                                             "taler",
                                             "currency",
                                             &currency))
  {
    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
                               "taler",
                               "currency");
    GNUNET_CONFIGURATION_destroy (cfg);
    return BAD_CONFIG_FILE;
  }
  if (howmany_clients > 1024)
  {
    TALER_LOG_ERROR ("-p option value given is too large\n");
    return BAD_CLI_ARG;
  }


  {
    char *bank_details_section;
    char *exchange_payto_url;

    GNUNET_CONFIGURATION_iterate_sections
      (cfg,
       pick_exchange_account_cb,
       &bank_details_section);

    GNUNET_assert (NULL != bank_details_section);
    GNUNET_assert
      (GNUNET_OK == GNUNET_CONFIGURATION_get_value_string
        (cfg,
         bank_details_section,
         "url",
         &exchange_payto_url));

    GNUNET_assert
      (TALER_EC_NONE == parse_payto (exchange_payto_url,
                                     &exchange_bank_account));
  }
  GNUNET_CONFIGURATION_destroy (cfg);

  compute_wire_response = GNUNET_OS_start_process
    (GNUNET_NO,
     GNUNET_OS_INHERIT_STD_ALL,
     NULL, NULL, NULL,
     "taler-exchange-wire",
     "taler-exchange-wire",
     "-c", cfg_filename,
     NULL);
  if (NULL == compute_wire_response)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
		"Failed to run `taler-exchange-wire`,"
                " is your PATH correct?\n");
    return GNUNET_NO;
  }
  GNUNET_OS_process_wait (compute_wire_response);
  GNUNET_OS_process_destroy (compute_wire_response);

  GNUNET_assert
    /* Takes care of dropping all tables.  */
    (GNUNET_OK == TALER_TESTING_prepare_exchange
      (cfg_filename,
       &exchange_url));
  result = parallel_benchmark (&run,
                               NULL,
                               cfg_filename,
                               exchange_url);
  GNUNET_free (exchange_url);
  duration = GNUNET_TIME_absolute_get_duration (start_time);

  TALER_LOG_INFO ("Executed W=%u, D=%u, R=%u, operations in %s\n",
                  howmany_coins,
                  howmany_coins,
                  howmany_refreshes,
                  GNUNET_STRINGS_relative_time_to_string
                    (duration,
                     GNUNET_NO));

  return (GNUNET_OK == result) ? 0 : result;
}