summaryrefslogtreecommitdiff
path: root/src/lib/testing_api_cmd_withdraw.c
blob: 41cd22249056a23218b15584d8e3fba074f8dcf0 (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
/*
  This file is part of TALER
  Copyright (C) 2018 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 exchange-lib/testing_api_cmd_withdraw.c
 * @brief main interpreter loop for testcases
 * @author Christian Grothoff
 * @author Marcello Stanisci
 */
#include "platform.h"
#include "taler_json_lib.h"
#include <microhttpd.h>
#include <gnunet/gnunet_curl_lib.h>
#include "exchange_api_handle.h"
#include "taler_signatures.h"
#include "taler_testing_lib.h"
#include "backoff.h"



/**
 * State for a "withdraw" CMD.
 */
struct WithdrawState
{

  /**
   * Which reserve should we withdraw from?
   */
  const char *reserve_reference;

  /**
   * String describing the denomination value we should withdraw.
   * A corresponding denomination key must exist in the exchange's
   * offerings.  Can be NULL if @e pk is set instead.
   */
  struct TALER_Amount amount;

  /**
   * If @e amount is NULL, this specifies the denomination key to
   * use.  Otherwise, this will be set (by the interpreter) to the
   * denomination PK matching @e amount.
   */
  const struct TALER_EXCHANGE_DenomPublicKey *pk;

  /**
   * Exchange base URL.  Only used as offered trait.
   */
  char *exchange_url;

  /**
   * Interpreter state (during command).
   */
  struct TALER_TESTING_Interpreter *is;

  /**
   * Set (by the interpreter) to the exchange's signature over the
   * coin's public key.
   */
  struct TALER_DenominationSignature sig;

  /**
   * Private key material of the coin, set by the interpreter.
   */
  struct TALER_PlanchetSecretsP ps;

  /**
   * Withdraw handle (while operation is running).
   */
  struct TALER_EXCHANGE_ReserveWithdrawHandle *wsh;

  /**
   * Task scheduled to try later.
   */
  struct GNUNET_SCHEDULER_Task *retry_task;

  /**
   * How long do we wait until we retry?
   */
  struct GNUNET_TIME_Relative backoff;

  /**
   * Expected HTTP response code to the request.
   */
  unsigned int expected_response_code;

  /**
   * Was this command modified via
   * #TALER_TESTING_cmd_withdraw_with_retry to
   * enable retries?
   */
  int do_retry;
};


/**
 * Run the command.
 *
 * @param cls closure.
 * @param cmd the commaind being run.
 * @param is interpreter state.
 */
static void
withdraw_run (void *cls,
              const struct TALER_TESTING_Command *cmd,
              struct TALER_TESTING_Interpreter *is);


/**
 * Task scheduled to re-try #withdraw_run.
 *
 * @param cls a `struct WithdrawState`
 */
static void
do_retry (void *cls)
{
  struct WithdrawState *ws = cls;

  ws->retry_task = NULL;
  withdraw_run (ws,
		NULL,
		ws->is);
}


/**
 * "reserve withdraw" operation callback; checks that the
 * response code is expected and store the exchange signature
 * in the state.
 *
 * @param cls closure.
 * @param http_status HTTP response code.
 * @param ec taler-specific error code.
 * @param sig signature over the coin, NULL on error.
 * @param full_response raw response.
 */
static void
reserve_withdraw_cb (void *cls,
                     unsigned int http_status,
		     enum TALER_ErrorCode ec,
                     const struct TALER_DenominationSignature *sig,
                     const json_t *full_response)
{
  struct WithdrawState *ws = cls;
  struct TALER_TESTING_Interpreter *is = ws->is;

  ws->wsh = NULL;
  if (ws->expected_response_code != http_status)
  {
    if (GNUNET_YES == ws->do_retry)
    {
      if ( (0 == http_status) ||
           (TALER_EC_DB_COMMIT_FAILED_ON_RETRY == ec) ||
	   (TALER_EC_WITHDRAW_INSUFFICIENT_FUNDS == ec) ||
	   (TALER_EC_WITHDRAW_RESERVE_UNKNOWN == ec) ||
	   (MHD_HTTP_INTERNAL_SERVER_ERROR == http_status) )
      {
        GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                    "Retrying withdraw failed with %u/%d\n",
                    http_status,
                    (int) ec);
	/* on DB conflicts, do not use backoff */
	if (TALER_EC_DB_COMMIT_FAILED_ON_RETRY == ec)
	  ws->backoff = GNUNET_TIME_UNIT_ZERO;
	else
	  ws->backoff = EXCHANGE_LIB_BACKOFF (ws->backoff);
	ws->retry_task = GNUNET_SCHEDULER_add_delayed (ws->backoff,
						       &do_retry,
						       ws);
	return;
      }
    }
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Unexpected response code %u/%d to command %s in %s:%u\n",
                http_status,
                (int) ec,
                TALER_TESTING_interpreter_get_current_label (is),
                __FILE__,
                __LINE__);
    json_dumpf (full_response,
                stderr,
                0);
    GNUNET_break (0);
    TALER_TESTING_interpreter_fail (is);
    return;
  }
  switch (http_status)
  {
  case MHD_HTTP_OK:
    if (NULL == sig)
    {
      GNUNET_break (0);
      TALER_TESTING_interpreter_fail (is);
      return;
    }
    ws->sig.rsa_signature
      = GNUNET_CRYPTO_rsa_signature_dup (sig->rsa_signature);
    break;
  case MHD_HTTP_FORBIDDEN:
    /* nothing to check */
    break;
  case MHD_HTTP_NOT_FOUND:
    /* nothing to check */
    break;
  default:
    /* Unsupported status code (by test harness) */
    GNUNET_break (0);
    break;
  }
  TALER_TESTING_interpreter_next (is);
}


/**
 * Run the command.
 *
 * @param cls closure.
 * @param cmd the command being run, NULL when called from #do_retry()
 * @param is interpreter state.
 */
static void
withdraw_run (void *cls,
              const struct TALER_TESTING_Command *cmd,
              struct TALER_TESTING_Interpreter *is)
{
  struct WithdrawState *ws = cls;
  const struct TALER_ReservePrivateKeyP *rp;
  const struct TALER_TESTING_Command *create_reserve;

  (void) cmd;
  create_reserve = TALER_TESTING_interpreter_lookup_command
    (is, ws->reserve_reference);
  if (NULL == create_reserve)
  {
    GNUNET_break (0);
    TALER_TESTING_interpreter_fail (is);
    return;
  }
  if (GNUNET_OK !=
      TALER_TESTING_get_trait_reserve_priv (create_reserve,
                                            0,
                                            &rp))
  {
    GNUNET_break (0);
    TALER_TESTING_interpreter_fail (is);
    return;
  }
  TALER_planchet_setup_random (&ws->ps);
  ws->is = is;

  ws->pk = TALER_TESTING_find_pk
    (TALER_EXCHANGE_get_keys (is->exchange),
     &ws->amount);
  if (NULL == ws->pk)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to determine denomination key at %s\n",
                cmd->label);
    GNUNET_assert (0);
  }

  ws->wsh = TALER_EXCHANGE_reserve_withdraw (is->exchange,
                                             ws->pk,
                                             rp,
                                             &ws->ps,
                                             &reserve_withdraw_cb,
                                             ws);
  if (NULL == ws->wsh)
  {
    GNUNET_break (0);
    TALER_TESTING_interpreter_fail (is);
    return;
  }
}


/**
 * Free the state of a "withdraw" CMD, and possibly cancel
 * a pending operation thereof.
 *
 * @param cls closure.
 * @param cmd the command being freed.
 */
static void
withdraw_cleanup (void *cls,
                  const struct TALER_TESTING_Command *cmd)
{
  struct WithdrawState *ws = cls;

  if (NULL != ws->wsh)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Command %s did not complete\n",
                cmd->label);
    TALER_EXCHANGE_reserve_withdraw_cancel (ws->wsh);
    ws->wsh = NULL;
  }
  if (NULL != ws->retry_task)
  {
    GNUNET_SCHEDULER_cancel (ws->retry_task);
    ws->retry_task = NULL;
  }
  if (NULL != ws->sig.rsa_signature)
  {
    GNUNET_CRYPTO_rsa_signature_free (ws->sig.rsa_signature);
    ws->sig.rsa_signature = NULL;
  }
  GNUNET_free_non_null (ws->exchange_url);
  GNUNET_free (ws);
}


/**
 * Offer internal data to a "withdraw" CMD state to other
 * commands.
 *
 * @param cls closure
 * @param ret[out] result (could be anything)
 * @param trait name of the trait
 * @param index index number of the object to offer.
 *
 * @return #GNUNET_OK on success
 */
static int
withdraw_traits (void *cls,
                 const void **ret,
                 const char *trait,
                 unsigned int index)
{
  struct WithdrawState *ws = cls;
  const struct TALER_TESTING_Command *reserve_cmd;
  const struct TALER_ReservePrivateKeyP *reserve_priv;

  /* We offer the reserve key where these coins were withdrawn
   * from. */
  reserve_cmd = TALER_TESTING_interpreter_lookup_command
    (ws->is, ws->reserve_reference);

  if (NULL == reserve_cmd)
  {
    GNUNET_break (0);
    TALER_TESTING_interpreter_fail (ws->is);
    return GNUNET_SYSERR;
  }

  if (GNUNET_OK != TALER_TESTING_get_trait_reserve_priv
    (reserve_cmd, 0, &reserve_priv))
  {
    GNUNET_break (0);
    TALER_TESTING_interpreter_fail (ws->is);
    return GNUNET_SYSERR;
  }
  if (NULL == ws->exchange_url)
    ws->exchange_url
      = GNUNET_strdup (TALER_EXCHANGE_get_base_url (ws->is->exchange));

  struct TALER_TESTING_Trait traits[] = {
    TALER_TESTING_make_trait_coin_priv (0 /* only one coin */,
                                        &ws->ps.coin_priv),
    TALER_TESTING_make_trait_blinding_key (0 /* only one coin */,
                                           &ws->ps.blinding_key),
    TALER_TESTING_make_trait_denom_pub (0 /* only one coin */,
                                        ws->pk),
    TALER_TESTING_make_trait_denom_sig (0 /* only one coin */,
                                        &ws->sig),
    TALER_TESTING_make_trait_reserve_priv (0,
                                           reserve_priv),
    TALER_TESTING_make_trait_amount_obj (0,
                                         &ws->amount),
    TALER_TESTING_make_trait_url (0, ws->exchange_url),
    TALER_TESTING_trait_end ()
  };

  return TALER_TESTING_get_trait (traits,
                                  ret,
                                  trait,
                                  index);
}


/**
 * Create a withdraw command, letting the caller specify
 * the desired amount as string.
 *
 * @param label command label.
 * @param amount how much we withdraw.
 * @param expected_response_code which HTTP response code
 *        we expect from the exchange.
 *
 * @return the withdraw command to be executed by the interpreter.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_amount
  (const char *label,
   const char *reserve_reference,
   const char *amount,
   unsigned int expected_response_code)
{
  struct WithdrawState *ws;

  ws = GNUNET_new (struct WithdrawState);
  ws->reserve_reference = reserve_reference;

  if (GNUNET_OK !=
      TALER_string_to_amount (amount,
                              &ws->amount))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to parse amount `%s' at %s\n",
                amount,
                label);
    GNUNET_assert (0);
  }

  ws->expected_response_code = expected_response_code;

  struct TALER_TESTING_Command cmd = {
    .cls = ws,
    .label = label,
    .run = &withdraw_run,
    .cleanup = &withdraw_cleanup,
    .traits = &withdraw_traits
  };

  return cmd;
}


/**
 * Create withdraw command, letting the caller specify the
 * amount by a denomination key.
 *
 * @param label command label.
 * @param exchange connection handle to the exchange.
 * @param reserve_reference reference to the reserve to withdraw
 *        from; will provide reserve priv to sign the request.
 * @param dk denomination public key.
 * @param expected_response_code expected HTTP response code.
 *
 * @return the command.
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_denomination
  (const char *label,
   const char *reserve_reference,
   const struct TALER_EXCHANGE_DenomPublicKey *dk,
   unsigned int expected_response_code)
{
  struct WithdrawState *ws;

  if (NULL == dk)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Denomination key not specified at %s\n",
                label);
    GNUNET_assert (0);
  }
  ws = GNUNET_new (struct WithdrawState);
  ws->reserve_reference = reserve_reference;
  ws->pk = dk;
  ws->expected_response_code = expected_response_code;

  struct TALER_TESTING_Command cmd = {
    .cls = ws,
    .label = label,
    .run = &withdraw_run,
    .cleanup = &withdraw_cleanup,
    .traits = &withdraw_traits
  };

  return cmd;
}


/**
 * Modify a withdraw command to enable retries when the
 * reserve is not yet full or we get other transient
 * errors from the exchange.
 *
 * @param cmd a withdraw command
 * @return the command with retries enabled
 */
struct TALER_TESTING_Command
TALER_TESTING_cmd_withdraw_with_retry (struct TALER_TESTING_Command cmd)
{
  struct WithdrawState *ws;

  GNUNET_assert (&withdraw_run == cmd.run);
  ws = cmd.cls;
  ws->do_retry = GNUNET_YES;
  return cmd;
}


/* end of testing_api_cmd_withdraw.c */