aboutsummaryrefslogtreecommitdiff
path: root/src/exchangedb/exchangedb_fees.c
blob: e3e16712dbc2556c7d9e9d3f493f26845aa6aede (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
/*
  This file is part of TALER
  Copyright (C) 2017 GNUnet e.V.

  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 exchangedb/exchangedb_fees.c
 * @brief Logic to read/write/convert aggregation wire fees (not other fees!)
 * @author Christian Grothoff
 */
#include "platform.h"
#include "taler_exchangedb_lib.h"


GNUNET_NETWORK_STRUCT_BEGIN

/**
 * Structure for wire fees on disk.
 */
struct TALER_WireFeeDiskP
{

  /**
   * Wire fee details.
   */
  struct TALER_MasterWireFeePS wf;


  /**
   * Signature affirming the above fee structure.
   */
  struct TALER_MasterSignatureP master_sig;

};

GNUNET_NETWORK_STRUCT_END


/**
 * Convert @a wd disk format to host format.
 *
 * @param wd aggregate fees, disk format
 * @return fees in host format
 */
static struct TALER_EXCHANGEDB_AggregateFees *
wd2af (const struct TALER_WireFeeDiskP *wd)
{
  struct TALER_EXCHANGEDB_AggregateFees *af;

  af = GNUNET_new (struct TALER_EXCHANGEDB_AggregateFees);
  af->start_date = GNUNET_TIME_absolute_ntoh (wd->wf.start_date);
  af->end_date = GNUNET_TIME_absolute_ntoh (wd->wf.end_date);
  TALER_amount_ntoh (&af->wire_fee,
                     &wd->wf.wire_fee);
  af->master_sig = wd->master_sig;
  return af;
}


/**
 * Read the current fee structure from disk.
 *
 * @param cfg configuration to use
 * @param wireplugin name of the wire plugin to read fees for
 * @return sorted list of aggregation fees, NULL on error
 */
struct TALER_EXCHANGEDB_AggregateFees *
TALER_EXCHANGEDB_fees_read (const struct GNUNET_CONFIGURATION_Handle *cfg,
                            const char *wireplugin)
{
  char *wirefee_base_dir;
  char *fn;
  struct GNUNET_DISK_FileHandle *fh;
  struct TALER_WireFeeDiskP wd;
  struct TALER_EXCHANGEDB_AggregateFees *af;
  struct TALER_EXCHANGEDB_AggregateFees *endp;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_filename (cfg,
                                               "exchangedb",
                                               "WIREFEE_BASE_DIR",
                                               &wirefee_base_dir))
    return NULL;
  GNUNET_asprintf (&fn,
                   "%s/%s.fee",
                   wirefee_base_dir,
                   wireplugin);
  GNUNET_free (wirefee_base_dir);
  fh = GNUNET_DISK_file_open (fn,
                              GNUNET_DISK_OPEN_READ,
                              GNUNET_DISK_PERM_NONE);
  GNUNET_free (fn);
  if (NULL == fh)
    return NULL;

  af = NULL;
  endp = NULL;
  while (sizeof (wd) ==
         GNUNET_DISK_file_read (fh,
                                &wd,
                                sizeof (wd)))
  {
    struct TALER_EXCHANGEDB_AggregateFees *n;

    n = wd2af (&wd);
    if ( ( (NULL == af) ||
           (endp->end_date.abs_value_us == n->start_date.abs_value_us) ) &&
         (n->start_date.abs_value_us < n->end_date.abs_value_us) )
    {
      /* append to list */
      if (NULL != endp)
        endp->next = n;
      else
        af = n;
      endp = n;
    }
    else
    {
      /* We expect file to be in chronological order! */
      GNUNET_break (0);
      GNUNET_DISK_file_close (fh);
      GNUNET_free (n);
      TALER_EXCHANGEDB_fees_free (af);
      return NULL;
    }
  }
  GNUNET_DISK_file_close (fh);
  return af;
}


/**
 * Convert @a af to @a wf.
 *
 * @param wireplugin name of the wire plugin the fees are for
 * @param[in,out] af aggregate fees, host format (updated to round time)
 * @param[out] wf aggregate fees, disk / signature format
 */
void
TALER_EXCHANGEDB_fees_2_wf (const char *wireplugin,
                            struct TALER_EXCHANGEDB_AggregateFees *af,
                            struct TALER_MasterWireFeePS *wf)
{
  (void) GNUNET_TIME_round_abs (&af->start_date);
  (void) GNUNET_TIME_round_abs (&af->end_date);
  wf->purpose.size = htonl (sizeof (*wf));
  wf->purpose.purpose = htonl (TALER_SIGNATURE_MASTER_WIRE_FEES);
  GNUNET_CRYPTO_hash (wireplugin,
                      strlen (wireplugin) + 1,
                      &wf->h_wire_method);
  wf->start_date = GNUNET_TIME_absolute_hton (af->start_date);
  wf->end_date = GNUNET_TIME_absolute_hton (af->end_date);
  TALER_amount_hton (&wf->wire_fee,
                     &af->wire_fee);
}


/**
 * Write given fee structure to disk.
 *
 * @param filename where to write the fees
 * @param wireplugin which plugin the fees are about
 * @param af fee structure to write
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
 */
int
TALER_EXCHANGEDB_fees_write (const char *filename,
                             const char *wireplugin,
                             struct TALER_EXCHANGEDB_AggregateFees *af)
{
  struct GNUNET_DISK_FileHandle *fh;
  struct TALER_WireFeeDiskP wd;
  struct TALER_EXCHANGEDB_AggregateFees *last;

  if (GNUNET_OK !=
      GNUNET_DISK_directory_create_for_file (filename))
    return GNUNET_SYSERR;

  fh = GNUNET_DISK_file_open (filename,
                              GNUNET_DISK_OPEN_WRITE |
                              GNUNET_DISK_OPEN_TRUNCATE |
                              GNUNET_DISK_OPEN_CREATE,
                              GNUNET_DISK_PERM_USER_READ |
                              GNUNET_DISK_PERM_USER_WRITE);
  if (NULL == fh)
    return GNUNET_SYSERR;

  last = NULL;
  while (NULL != af)
  {
    if ( ( (NULL != last) &&
           (last->end_date.abs_value_us != af->start_date.abs_value_us) ) ||
         (af->start_date.abs_value_us >= af->end_date.abs_value_us) )
    {
      /* @a af malformed, refusing to write file that will be rejected */
      GNUNET_break (0);
      GNUNET_assert (GNUNET_OK ==
                     GNUNET_DISK_file_close (fh));
      return GNUNET_SYSERR;
    }
    TALER_EXCHANGEDB_fees_2_wf (wireplugin,
                                af,
                                &wd.wf);
    wd.master_sig = af->master_sig;
    af = af->next;
    if (sizeof (wd) !=
        GNUNET_DISK_file_write (fh,
                                &wd,
                                sizeof (wd)))
    {
      GNUNET_assert (GNUNET_OK ==
                     GNUNET_DISK_file_close (fh));
      return GNUNET_SYSERR;
    }
  }
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_DISK_file_close (fh));
  return GNUNET_OK;
}


/**
 * Free @a af data structure
 *
 * @param af list to free
 */
void
TALER_EXCHANGEDB_fees_free (struct TALER_EXCHANGEDB_AggregateFees *af)
{
  struct TALER_EXCHANGEDB_AggregateFees *next;

  while (NULL != af)
  {
    next = af->next;
    GNUNET_free (af);
    af = next;
  }
}


/* end of exchangedb_fees.c */