aboutsummaryrefslogtreecommitdiff
path: root/src/messenger/gnunet-service-messenger_message_store.c
blob: 5933d63906c5cde88f3bbbfa3fd4916cdfd437e0 (plain) (blame)
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
/*
   This file is part of GNUnet.
   Copyright (C) 2020 GNUnet e.V.

   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
 */
/**
 * @author Tobias Frisch
 * @file src/messenger/gnunet-service-messenger_message_store.c
 * @brief GNUnet MESSENGER service
 */

#include "gnunet-service-messenger_message_store.h"
#include "messenger_api_message.h"

void
init_message_store (struct GNUNET_MESSENGER_MessageStore *store)
{
  store->storage_messages = NULL;

  store->entries = GNUNET_CONTAINER_multihashmap_create (8, GNUNET_NO);
  store->messages = GNUNET_CONTAINER_multihashmap_create (8, GNUNET_NO);
}

static int
iterate_destroy_entries (void *cls, const struct GNUNET_HashCode *key, void *value)
{
  struct GNUNET_MESSENGER_MessageEntry *entry = value;

  GNUNET_free(entry);

  return GNUNET_YES;
}

static int
iterate_destroy_messages (void *cls, const struct GNUNET_HashCode *key, void *value)
{
  struct GNUNET_MESSENGER_Message *message = value;

  destroy_message (message);

  return GNUNET_YES;
}

void
clear_message_store (struct GNUNET_MESSENGER_MessageStore *store)
{
  if (store->storage_messages)
  {
    GNUNET_DISK_file_close (store->storage_messages);

    store->storage_messages = NULL;
  }

  GNUNET_CONTAINER_multihashmap_iterate (store->entries, iterate_destroy_entries, NULL);
  GNUNET_CONTAINER_multihashmap_iterate (store->messages, iterate_destroy_messages, NULL);

  GNUNET_CONTAINER_multihashmap_destroy (store->entries);
  GNUNET_CONTAINER_multihashmap_destroy (store->messages);
}

struct GNUNET_MESSENGER_MessageEntryStorage
{
  struct GNUNET_HashCode hash;
  struct GNUNET_MESSENGER_MessageEntry entry;
};

void
load_message_store (struct GNUNET_MESSENGER_MessageStore *store, const char *directory)
{
  enum GNUNET_DISK_AccessPermissions permission = (GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);

  if (store->storage_messages)
    GNUNET_DISK_file_close (store->storage_messages);

  char *filename;
  GNUNET_asprintf (&filename, "%s%s", directory, "messages.store");

  if (GNUNET_YES == GNUNET_DISK_file_test (filename))
    store->storage_messages = GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READ, permission);
  else
    store->storage_messages = NULL;

  GNUNET_free(filename);

  if (!store->storage_messages)
    return;

  GNUNET_asprintf (&filename, "%s%s", directory, "entries.store");

  if (GNUNET_YES != GNUNET_DISK_file_test (filename))
    goto free_filename;

  struct GNUNET_DISK_FileHandle *entries = GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READ, permission);

  if (!entries)
    goto free_filename;

  struct GNUNET_MESSENGER_MessageEntryStorage storage;
  struct GNUNET_MESSENGER_MessageEntry *entry;

  do
  {
    entry = GNUNET_new(struct GNUNET_MESSENGER_MessageEntry);

    if (GNUNET_DISK_file_read (entries, &storage, sizeof(storage)) == sizeof(storage))
    {
      GNUNET_memcpy(entry, &(storage.entry), sizeof(*entry));

      if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (store->entries, &(storage.hash), entry,
                                                          GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
        GNUNET_free(entry);
    }
    else
    {
      GNUNET_free(entry);

      entry = NULL;
    }
  }
  while (entry);

  GNUNET_DISK_file_close (entries);

free_filename:
  GNUNET_free(filename);
}

struct GNUNET_MESSENGER_MessageSave
{
  struct GNUNET_MESSENGER_MessageStore *store;

  struct GNUNET_DISK_FileHandle *storage_entries;
};

static int
iterate_save_messages (void *cls, const struct GNUNET_HashCode *key, void *value)
{
  struct GNUNET_MESSENGER_MessageSave *save = cls;

  if (GNUNET_NO != GNUNET_CONTAINER_multihashmap_contains (save->store->entries, key))
    return GNUNET_YES;

  struct GNUNET_MESSENGER_Message *message = value;
  struct GNUNET_MESSENGER_MessageEntryStorage storage;

  GNUNET_memcpy(&(storage.hash), key, sizeof(storage.hash));

  storage.entry.length = get_message_size (message);
  storage.entry.offset = GNUNET_DISK_file_seek (save->store->storage_messages, 0, GNUNET_DISK_SEEK_END);

  if ((GNUNET_SYSERR == storage.entry.offset) ||
      (sizeof(storage) != GNUNET_DISK_file_write (save->storage_entries, &storage, sizeof(storage))))
    return GNUNET_YES;

  char *buffer = GNUNET_malloc(storage.entry.length);

  encode_message (message, storage.entry.length, buffer);

  GNUNET_DISK_file_write (save->store->storage_messages, buffer, storage.entry.length);

  GNUNET_free(buffer);

  return GNUNET_YES;
}

void
save_message_store (struct GNUNET_MESSENGER_MessageStore *store, const char *directory)
{
  struct GNUNET_MESSENGER_MessageSave save;

  enum GNUNET_DISK_AccessPermissions permission = (GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE);

  char *filename;
  GNUNET_asprintf (&filename, "%s%s", directory, "entries.store");

  save.store = store;
  save.storage_entries = GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_CREATE, permission);

  GNUNET_free(filename);

  if (!save.storage_entries)
    return;

  if (GNUNET_SYSERR == GNUNET_DISK_file_seek (save.storage_entries, 0, GNUNET_DISK_SEEK_END))
    goto close_entries;

  if (store->storage_messages)
    GNUNET_DISK_file_close (store->storage_messages);

  GNUNET_asprintf (&filename, "%s%s", directory, "messages.store");

  store->storage_messages = GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READWRITE | GNUNET_DISK_OPEN_CREATE,
                                                   permission);

  GNUNET_free(filename);

  if (store->storage_messages)
  {
    GNUNET_CONTAINER_multihashmap_iterate (store->messages, iterate_save_messages, &save);

    GNUNET_DISK_file_sync (store->storage_messages);
    GNUNET_DISK_file_sync (save.storage_entries);
  }

close_entries:
  GNUNET_DISK_file_close (save.storage_entries);
}

int
contains_store_message (struct GNUNET_MESSENGER_MessageStore *store, const struct GNUNET_HashCode *hash)
{
  if (GNUNET_YES == GNUNET_CONTAINER_multihashmap_contains (store->messages, hash))
    return GNUNET_YES;

  return GNUNET_CONTAINER_multihashmap_contains (store->entries, hash);
}

const struct GNUNET_MESSENGER_Message*
get_store_message (struct GNUNET_MESSENGER_MessageStore *store, const struct GNUNET_HashCode *hash)
{
  struct GNUNET_MESSENGER_Message *message = GNUNET_CONTAINER_multihashmap_get (store->messages, hash);

  if (message)
    return message;

  if (!store->storage_messages)
    return NULL;

  const struct GNUNET_MESSENGER_MessageEntry *entry = GNUNET_CONTAINER_multihashmap_get (store->entries, hash);

  if (!entry)
    return NULL;

  if (entry->offset != GNUNET_DISK_file_seek (store->storage_messages, entry->offset, GNUNET_DISK_SEEK_SET))
    return message;

  char *buffer = GNUNET_malloc(entry->length);

  if (GNUNET_DISK_file_read (store->storage_messages, buffer, entry->length) != entry->length)
    goto free_buffer;


  message = create_message (GNUNET_MESSENGER_KIND_UNKNOWN);

  if ((GNUNET_YES != decode_message (message, entry->length, buffer)) || (GNUNET_OK
      != GNUNET_CONTAINER_multihashmap_put (store->messages, hash, message,
                                            GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)))
  {
    destroy_message (message);

    message = NULL;

    GNUNET_CONTAINER_multihashmap_remove (store->entries, hash, entry);
  }

free_buffer:
  GNUNET_free(buffer);

  return message;
}

int
put_store_message (struct GNUNET_MESSENGER_MessageStore *store, const struct GNUNET_HashCode *hash,
                   struct GNUNET_MESSENGER_Message *message)
{
  return GNUNET_CONTAINER_multihashmap_put (store->messages, hash, message,
                                            GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
}