summaryrefslogtreecommitdiff
path: root/src/peerstore/plugin_peerstore_flat.c
blob: 5efe9dddc09eee54aed2c18cfd77f29026a50a43 (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
/*
 * This file is part of GNUnet
 * Copyright (C) 2015 Christian Grothoff (and other contributing authors)
 *
 * GNUnet 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 of the License,
 * or (at your option) any later version.
 *
 * GNUnet 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 General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

/**
 * @file peerstore/plugin_peerstore_flat.c
 * @brief flat file-based peerstore backend
 * @author Martin Schanzenbach
 */

#include "platform.h"
#include "gnunet_peerstore_plugin.h"
#include "gnunet_peerstore_service.h"
#include "peerstore.h"

/**
 * Context for all functions in this plugin.
 */
struct Plugin
{
  /**
   * Configuration handle
   */
  const struct GNUNET_CONFIGURATION_Handle *cfg;

  /**
   * HashMap
   */
  struct GNUNET_CONTAINER_MultiHashMap *hm;

  /**
   * Iterator
   */
  GNUNET_PEERSTORE_Processor iter;

  /**
   * Iterator cls
   */
  void *iter_cls;

  /**
   * iterator key
   */
  const char *iter_key;

  /**
   * Iterator peer
   */
  const struct GNUNET_PeerIdentity *iter_peer;

  /**
   * Iterator subsystem
   */
  const char *iter_sub_system;

  /**
   * Iterator time
   */
  struct GNUNET_TIME_Absolute iter_now;

  /**
   * Deleted entries
   */
  uint64_t deleted_entries;

  /**
   * Expired entries
   */
  uint64_t exp_changes;

  /**
   * Database filename.
   */
  char *fn;

  /**
   * Result found bool
   */
  int iter_result_found;
};


static int
delete_entries (void *cls,
                const struct GNUNET_HashCode *key,
                void *value)
{
  struct Plugin *plugin = cls;
  struct GNUNET_PEERSTORE_Record *entry = value;

  if (0 != strcmp (plugin->iter_key, entry->key))
    return GNUNET_YES;
  if (0 != memcmp (plugin->iter_peer,
                   &entry->peer,
                   sizeof(struct GNUNET_PeerIdentity)))
    return GNUNET_YES;
  if (0 != strcmp (plugin->iter_sub_system, entry->sub_system))
    return GNUNET_YES;

  GNUNET_CONTAINER_multihashmap_remove (plugin->hm, key, value);
  plugin->deleted_entries++;
  return GNUNET_YES;
}


/**
 * Delete records with the given key
 *
 * @param cls closure (internal context for the plugin)
 * @param sub_system name of sub system
 * @param peer Peer identity (can be NULL)
 * @param key entry key string (can be NULL)
 * @return number of deleted records
 */
static int
peerstore_flat_delete_records (void *cls, const char *sub_system,
                               const struct GNUNET_PeerIdentity *peer,
                               const char *key)
{
  struct Plugin *plugin = cls;

  plugin->iter_sub_system = sub_system;
  plugin->iter_peer = peer;
  plugin->iter_key = key;
  plugin->deleted_entries = 0;

  GNUNET_CONTAINER_multihashmap_iterate (plugin->hm,
                                         &delete_entries,
                                         plugin);
  return plugin->deleted_entries;
}


static int
expire_entries (void *cls,
                const struct GNUNET_HashCode *key,
                void *value)
{
  struct Plugin *plugin = cls;
  struct GNUNET_PEERSTORE_Record *entry = value;

  if (entry->expiry.abs_value_us < plugin->iter_now.abs_value_us)
  {
    GNUNET_CONTAINER_multihashmap_remove (plugin->hm, key, value);
    plugin->exp_changes++;
  }
  return GNUNET_YES;
}


/**
 * Delete expired records (expiry < now)
 *
 * @param cls closure (internal context for the plugin)
 * @param now time to use as reference
 * @param cont continuation called with the number of records expired
 * @param cont_cls continuation closure
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error and cont is not
 * called
 */
static int
peerstore_flat_expire_records (void *cls, struct GNUNET_TIME_Absolute now,
                               GNUNET_PEERSTORE_Continuation cont,
                               void *cont_cls)
{
  struct Plugin *plugin = cls;

  plugin->exp_changes = 0;
  plugin->iter_now = now;

  GNUNET_CONTAINER_multihashmap_iterate (plugin->hm,
                                         &expire_entries,
                                         plugin);
  if (NULL != cont)
  {
    cont (cont_cls, plugin->exp_changes);
  }
  return GNUNET_OK;
}


static int
iterate_entries (void *cls,
                 const struct GNUNET_HashCode *key,
                 void *value)
{
  struct Plugin *plugin = cls;
  struct GNUNET_PEERSTORE_Record *entry = value;

  if ((NULL != plugin->iter_peer) &&
      (0 != memcmp (plugin->iter_peer,
                    &entry->peer,
                    sizeof(struct GNUNET_PeerIdentity))))
  {
    return GNUNET_YES;
  }
  if ((NULL != plugin->iter_key) &&
      (0 != strcmp (plugin->iter_key,
                    entry->key)))
  {
    return GNUNET_YES;
  }
  if (NULL != plugin->iter)
    plugin->iter (plugin->iter_cls, entry, NULL);
  plugin->iter_result_found = GNUNET_YES;
  return GNUNET_YES;
}


/**
 * Iterate over the records given an optional peer id
 * and/or key.
 *
 * @param cls closure (internal context for the plugin)
 * @param sub_system name of sub system
 * @param peer Peer identity (can be NULL)
 * @param key entry key string (can be NULL)
 * @param iter function to call asynchronously with the results, terminated
 * by a NULL result
 * @param iter_cls closure for @a iter
 * @return #GNUNET_OK on success, #GNUNET_SYSERR on error and iter is not
 * called
 */
static int
peerstore_flat_iterate_records (void *cls, const char *sub_system,
                                const struct GNUNET_PeerIdentity *peer,
                                const char *key,
                                GNUNET_PEERSTORE_Processor iter,
                                void *iter_cls)
{
  struct Plugin *plugin = cls;

  plugin->iter = iter;
  plugin->iter_cls = iter_cls;
  plugin->iter_peer = peer;
  plugin->iter_sub_system = sub_system;
  plugin->iter_key = key;

  GNUNET_CONTAINER_multihashmap_iterate (plugin->hm,
                                         &iterate_entries,
                                         plugin);
  if (NULL != iter)
    iter (iter_cls, NULL, NULL);
  return GNUNET_OK;
}


/**
 * Store a record in the peerstore.
 * Key is the combination of sub system and peer identity.
 * One key can store multiple values.
 *
 * @param cls closure (internal context for the plugin)
 * @param sub_system name of the GNUnet sub system responsible
 * @param peer peer identity
 * @param key record key string
 * @param value value to be stored
 * @param size size of value to be stored
 * @param expiry absolute time after which the record is (possibly) deleted
 * @param options options related to the store operation
 * @param cont continuation called when record is stored
 * @param cont_cls continuation closure
 * @return #GNUNET_OK on success, else #GNUNET_SYSERR and cont is not called
 */
static int
peerstore_flat_store_record (void *cls, const char *sub_system,
                             const struct GNUNET_PeerIdentity *peer,
                             const char *key, const void *value, size_t size,
                             struct GNUNET_TIME_Absolute expiry,
                             enum GNUNET_PEERSTORE_StoreOption options,
                             GNUNET_PEERSTORE_Continuation cont,
                             void *cont_cls)
{
  struct Plugin *plugin = cls;
  struct GNUNET_HashCode hkey;
  struct GNUNET_PEERSTORE_Record *entry;
  const char *peer_id;


  entry = GNUNET_new (struct GNUNET_PEERSTORE_Record);
  entry->sub_system = GNUNET_strdup (sub_system);
  entry->key = GNUNET_strdup (key);
  entry->value = GNUNET_malloc (size);
  GNUNET_memcpy (entry->value, value, size);
  entry->value_size = size;
  entry->peer = *peer;
  entry->expiry = expiry;

  peer_id = GNUNET_i2s (peer);
  GNUNET_CRYPTO_hash (peer_id,
                      strlen (peer_id),
                      &hkey);

  if (GNUNET_PEERSTORE_STOREOPTION_REPLACE == options)
  {
    peerstore_flat_delete_records (cls, sub_system, peer, key);
  }

  GNUNET_CONTAINER_multihashmap_put (plugin->hm,
                                     &hkey,
                                     entry,
                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
  if (NULL != cont)
  {
    cont (cont_cls, GNUNET_OK);
  }
  return GNUNET_OK;
}


/**
 * Initialize the database connections and associated
 * data structures (create tables and indices
 * as needed as well).
 *
 * @param plugin the plugin context (state for this module)
 * @return GNUNET_OK on success
 */
static int
database_setup (struct Plugin *plugin)
{
  char *afsdir;
  char *key;
  char *sub_system;
  const char *peer_id;
  char *peer;
  char *value;
  char *expiry;
  struct GNUNET_DISK_FileHandle *fh;
  struct GNUNET_PEERSTORE_Record *entry;
  struct GNUNET_HashCode hkey;
  uint64_t size;
  char *buffer;
  char *line;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_filename (plugin->cfg, "peerstore-flat",
                                               "FILENAME", &afsdir))
  {
    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR, "peerstore-flat",
                               "FILENAME");
    return GNUNET_SYSERR;
  }
  if (GNUNET_OK != GNUNET_DISK_file_test (afsdir))
  {
    if (GNUNET_OK != GNUNET_DISK_directory_create_for_file (afsdir))
    {
      GNUNET_break (0);
      GNUNET_free (afsdir);
      return GNUNET_SYSERR;
    }
  }
  /* afsdir should be UTF-8-encoded. If it isn't, it's a bug */
  plugin->fn = afsdir;

  fh = GNUNET_DISK_file_open (afsdir,
                              GNUNET_DISK_OPEN_CREATE
                              | GNUNET_DISK_OPEN_READWRITE,
                              GNUNET_DISK_PERM_USER_WRITE
                              | GNUNET_DISK_PERM_USER_READ);
  if (NULL == fh)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unable to initialize file: %s.\n"),
                afsdir);
    return GNUNET_SYSERR;
  }

  /* Load data from file into hashmap */
  plugin->hm = GNUNET_CONTAINER_multihashmap_create (10,
                                                     GNUNET_NO);

  if (GNUNET_SYSERR == GNUNET_DISK_file_size (afsdir,
                                              &size,
                                              GNUNET_YES,
                                              GNUNET_YES))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unable to get filesize: %s.\n"),
                afsdir);
    return GNUNET_SYSERR;
  }

  buffer = GNUNET_malloc (size + 1);

  if (GNUNET_SYSERR == GNUNET_DISK_file_read (fh,
                                              buffer,
                                              size))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unable to read file: %s.\n"),
                afsdir);
    GNUNET_DISK_file_close (fh);
    GNUNET_free (buffer);
    return GNUNET_SYSERR;
  }

  buffer[size] = '\0';
  GNUNET_DISK_file_close (fh);
  if (0 < size)
  {
    line = strtok (buffer, "\n");
    while (line != NULL)
    {
      sub_system = strtok (line, ",");
      if (NULL == sub_system)
        break;
      peer = strtok (NULL, ",");
      if (NULL == peer)
        break;
      key = strtok (NULL, ",");
      if (NULL == key)
        break;
      value = strtok (NULL, ",");
      if (NULL == value)
        break;
      expiry = strtok (NULL, ",");
      if (NULL == expiry)
        break;
      entry = GNUNET_new (struct GNUNET_PEERSTORE_Record);
      entry->sub_system = GNUNET_strdup (sub_system);
      entry->key = GNUNET_strdup (key);
      {
        size_t s;
        char *o;

        o = NULL;
        s = GNUNET_STRINGS_base64_decode (peer,
                                          strlen (peer),
                                          (void **) &o);
        if (sizeof(struct GNUNET_PeerIdentity) == s)
          GNUNET_memcpy (&entry->peer,
                         o,
                         s);
        else
          GNUNET_break (0);
        GNUNET_free_non_null (o);
      }
      entry->value_size = GNUNET_STRINGS_base64_decode (value,
                                                        strlen (value),
                                                        (void **) &entry->value);
      if (GNUNET_SYSERR ==
          GNUNET_STRINGS_fancy_time_to_absolute (expiry,
                                                 &entry->expiry))
      {
        GNUNET_free (entry->sub_system);
        GNUNET_free (entry->key);
        GNUNET_free (entry);
        break;
      }
      peer_id = GNUNET_i2s (&entry->peer);
      GNUNET_CRYPTO_hash (peer_id,
                          strlen (peer_id),
                          &hkey);

      GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (plugin->hm,
                                                                     &hkey,
                                                                     entry,
                                                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
    }
  }
  GNUNET_free (buffer);
  return GNUNET_OK;
}


static int
store_and_free_entries (void *cls,
                        const struct GNUNET_HashCode *key,
                        void *value)
{
  struct GNUNET_DISK_FileHandle *fh = cls;
  struct GNUNET_PEERSTORE_Record *entry = value;
  char *line;
  char *peer;
  const char *expiry;
  char *val;

  GNUNET_STRINGS_base64_encode (entry->value,
                                entry->value_size,
                                &val);
  expiry = GNUNET_STRINGS_absolute_time_to_string (entry->expiry);
  GNUNET_STRINGS_base64_encode ((char *) &entry->peer,
                                sizeof(struct GNUNET_PeerIdentity),
                                &peer);
  GNUNET_asprintf (&line,
                   "%s,%s,%s,%s,%s",
                   entry->sub_system,
                   peer,
                   entry->key,
                   val,
                   expiry);
  GNUNET_free (val);
  GNUNET_free (peer);
  GNUNET_DISK_file_write (fh,
                          line,
                          strlen (line));
  GNUNET_free (entry->sub_system);
  GNUNET_free (entry->key);
  GNUNET_free (entry->value);
  GNUNET_free (entry);
  GNUNET_free (line);
  return GNUNET_YES;
}


/**
 * Shutdown database connection and associate data
 * structures.
 * @param plugin the plugin context (state for this module)
 */
static void
database_shutdown (struct Plugin *plugin)
{
  struct GNUNET_DISK_FileHandle *fh;

  fh = GNUNET_DISK_file_open (plugin->fn,
                              GNUNET_DISK_OPEN_CREATE
                              | GNUNET_DISK_OPEN_TRUNCATE
                              | GNUNET_DISK_OPEN_READWRITE,
                              GNUNET_DISK_PERM_USER_WRITE
                              | GNUNET_DISK_PERM_USER_READ);
  if (NULL == fh)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Unable to initialize file: %s.\n"),
                plugin->fn);
    return;
  }
  GNUNET_CONTAINER_multihashmap_iterate (plugin->hm,
                                         &store_and_free_entries,
                                         fh);
  GNUNET_CONTAINER_multihashmap_destroy (plugin->hm);
  GNUNET_DISK_file_close (fh);
}


/**
 * Entry point for the plugin.
 *
 * @param cls The struct GNUNET_CONFIGURATION_Handle.
 * @return NULL on error, otherwise the plugin context
 */
void *
libgnunet_plugin_peerstore_flat_init (void *cls)
{
  static struct Plugin plugin;
  const struct GNUNET_CONFIGURATION_Handle *cfg = cls;
  struct GNUNET_PEERSTORE_PluginFunctions *api;

  if (NULL != plugin.cfg)
    return NULL;                /* can only initialize once! */
  memset (&plugin, 0, sizeof(struct Plugin));
  plugin.cfg = cfg;
  if (GNUNET_OK != database_setup (&plugin))
  {
    database_shutdown (&plugin);
    return NULL;
  }
  api = GNUNET_new (struct GNUNET_PEERSTORE_PluginFunctions);
  api->cls = &plugin;
  api->store_record = &peerstore_flat_store_record;
  api->iterate_records = &peerstore_flat_iterate_records;
  api->expire_records = &peerstore_flat_expire_records;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Flat plugin is running\n");
  return api;
}


/**
 * Exit point from the plugin.
 *
 * @param cls The plugin context (as returned by "init")
 * @return Always NULL
 */
void *
libgnunet_plugin_peerstore_flat_done (void *cls)
{
  struct GNUNET_PEERSTORE_PluginFunctions *api = cls;
  struct Plugin *plugin = api->cls;

  database_shutdown (plugin);
  plugin->cfg = NULL;
  GNUNET_free (api);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Flat plugin is finished\n");
  return NULL;
}


/* end of plugin_peerstore_sqlite.c */