2 This file is part of GNUnet.
3 (C) 2003, 2004, 2006, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file fs/fs_unindex.c
23 * @author Krista Grothoff
24 * @author Christian Grothoff
25 * @brief Unindex file.
28 #include "gnunet_constants.h"
29 #include "gnunet_fs_service.h"
30 #include "gnunet_protocols.h"
34 #define DEBUG_UNINDEX GNUNET_NO
37 * Function called by the tree encoder to obtain
38 * a block of plaintext data (for the lowest level
41 * @param cls our publishing context
42 * @param offset identifies which block to get
43 * @param max (maximum) number of bytes to get; returning
44 * fewer will also cause errors
45 * @param buf where to copy the plaintext buffer
46 * @param emsg location to store an error message (on error)
47 * @return number of bytes copied to buf, 0 on error
50 unindex_reader (void *cls, uint64_t offset, size_t max, void *buf, char **emsg)
52 struct GNUNET_FS_UnindexContext *uc = cls;
55 pt_size = GNUNET_MIN (max, uc->file_size - offset);
56 if (offset != GNUNET_DISK_file_seek (uc->fh, offset, GNUNET_DISK_SEEK_SET))
58 *emsg = GNUNET_strdup (_("Failed to find given position in file"));
61 if (pt_size != GNUNET_DISK_file_read (uc->fh, buf, pt_size))
63 *emsg = GNUNET_strdup (_("Failed to read file"));
71 * Fill in all of the generic fields for
72 * an unindex event and call the callback.
74 * @param pi structure to fill in
75 * @param uc overall unindex context
76 * @param offset where we are in the file (for progress)
79 GNUNET_FS_unindex_make_status_ (struct GNUNET_FS_ProgressInfo *pi,
80 struct GNUNET_FS_UnindexContext *uc,
83 pi->value.unindex.uc = uc;
84 pi->value.unindex.cctx = uc->client_info;
85 pi->value.unindex.filename = uc->filename;
86 pi->value.unindex.size = uc->file_size;
88 = GNUNET_TIME_calculate_eta (uc->start_time, offset, uc->file_size);
89 pi->value.unindex.duration =
90 GNUNET_TIME_absolute_get_duration (uc->start_time);
91 pi->value.unindex.completed = offset;
92 uc->client_info = uc->h->upcb (uc->h->upcb_cls, pi);
98 * Function called with information about our
99 * progress in computing the tree encoding.
102 * @param offset where are we in the file
103 * @param pt_block plaintext of the currently processed block
104 * @param pt_size size of pt_block
105 * @param depth depth of the block in the tree, 0 for DBLOCK
108 unindex_progress (void *cls,
110 const void *pt_block, size_t pt_size, unsigned int depth)
112 struct GNUNET_FS_UnindexContext *uc = cls;
113 struct GNUNET_FS_ProgressInfo pi;
115 pi.status = GNUNET_FS_STATUS_UNINDEX_PROGRESS;
116 pi.value.unindex.specifics.progress.data = pt_block;
117 pi.value.unindex.specifics.progress.offset = offset;
118 pi.value.unindex.specifics.progress.data_len = pt_size;
119 pi.value.unindex.specifics.progress.depth = depth;
120 GNUNET_FS_unindex_make_status_ (&pi, uc, offset);
125 * We've encountered an error during
126 * unindexing. Signal the client.
128 * @param uc context for the failed unindexing operation
131 signal_unindex_error (struct GNUNET_FS_UnindexContext *uc)
133 struct GNUNET_FS_ProgressInfo pi;
135 pi.status = GNUNET_FS_STATUS_UNINDEX_ERROR;
136 pi.value.unindex.eta = GNUNET_TIME_UNIT_FOREVER_REL;
137 pi.value.unindex.specifics.error.message = uc->emsg;
138 GNUNET_FS_unindex_make_status_ (&pi, uc, 0);
143 * Continuation called to notify client about result of the
144 * datastore removal operation.
147 * @param success GNUNET_SYSERR on failure
148 * @param msg NULL on success, otherwise an error message
151 process_cont (void *cls, int success, const char *msg)
153 struct GNUNET_FS_UnindexContext *uc = cls;
155 if (success == GNUNET_SYSERR)
157 uc->emsg = GNUNET_strdup (msg);
158 signal_unindex_error (uc);
162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
163 "Datastore REMOVE operation succeeded\n");
165 GNUNET_FS_tree_encoder_next (uc->tc);
170 * Function called asking for the current (encoded)
171 * block to be processed. After processing the
172 * client should either call "GNUNET_FS_tree_encode_next"
173 * or (on error) "GNUNET_FS_tree_encode_finish".
176 * @param chk content hash key for the block (key for lookup in the datastore)
177 * @param offset offset of the block
178 * @param depth depth of the block, 0 for DBLOCK
179 * @param type type of the block (IBLOCK or DBLOCK)
180 * @param block the (encrypted) block
181 * @param block_size size of block (in bytes)
184 unindex_process (void *cls,
185 const struct ContentHashKey *chk,
188 enum GNUNET_BLOCK_Type type,
189 const void *block, uint16_t block_size)
191 struct GNUNET_FS_UnindexContext *uc = cls;
194 struct OnDemandBlock odb;
196 if (type != GNUNET_BLOCK_TYPE_FS_DBLOCK)
201 else /* on-demand encoded DBLOCK */
203 size = sizeof (struct OnDemandBlock);
204 odb.offset = GNUNET_htonll (offset);
205 odb.file_id = uc->file_id;
209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
210 "Sending REMOVE request to DATASTORE service\n");
212 GNUNET_DATASTORE_remove (uc->dsh,
217 GNUNET_CONSTANTS_SERVICE_TIMEOUT, &process_cont, uc);
222 * Function called with the response from the
223 * FS service to our unindexing request.
225 * @param cls closure, unindex context
226 * @param msg NULL on timeout, otherwise the response
229 process_fs_response (void *cls, const struct GNUNET_MessageHeader *msg)
231 struct GNUNET_FS_UnindexContext *uc = cls;
232 struct GNUNET_FS_ProgressInfo pi;
234 if (uc->client != NULL)
236 GNUNET_CLIENT_disconnect (uc->client, GNUNET_NO);
239 if (uc->state != UNINDEX_STATE_FS_NOTIFY)
241 uc->state = UNINDEX_STATE_ERROR;
243 GNUNET_strdup (_("Unexpected time for a response from `fs' service."));
244 GNUNET_FS_unindex_sync_ (uc);
245 signal_unindex_error (uc);
250 uc->state = UNINDEX_STATE_ERROR;
251 uc->emsg = GNUNET_strdup (_("Timeout waiting for `fs' service."));
252 GNUNET_FS_unindex_sync_ (uc);
253 signal_unindex_error (uc);
256 if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_UNINDEX_OK)
258 uc->state = UNINDEX_STATE_ERROR;
259 uc->emsg = GNUNET_strdup (_("Invalid response from `fs' service."));
260 GNUNET_FS_unindex_sync_ (uc);
261 signal_unindex_error (uc);
264 uc->state = UNINDEX_STATE_COMPLETE;
265 pi.status = GNUNET_FS_STATUS_UNINDEX_COMPLETED;
266 pi.value.unindex.eta = GNUNET_TIME_UNIT_ZERO;
267 GNUNET_FS_unindex_sync_ (uc);
268 GNUNET_FS_unindex_make_status_ (&pi, uc, uc->file_size);
273 * Function called when the tree encoder has
274 * processed all blocks. Clean up.
276 * @param cls our unindexing context
280 unindex_finish (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
282 struct GNUNET_FS_UnindexContext *uc = cls;
284 struct GNUNET_FS_Uri *uri;
285 struct UnindexMessage req;
287 /* generate final progress message */
288 unindex_progress (uc, uc->file_size, NULL, 0, 0);
289 GNUNET_FS_tree_encoder_finish (uc->tc, &uri, &emsg);
292 GNUNET_FS_uri_destroy (uri);
293 GNUNET_DISK_file_close (uc->fh);
295 GNUNET_DATASTORE_disconnect (uc->dsh, GNUNET_NO);
297 uc->state = UNINDEX_STATE_FS_NOTIFY;
298 GNUNET_FS_unindex_sync_ (uc);
299 uc->client = GNUNET_CLIENT_connect ("fs", uc->h->cfg);
300 if (uc->client == NULL)
302 uc->state = UNINDEX_STATE_ERROR;
304 GNUNET_strdup (_("Failed to connect to FS service for unindexing."));
305 GNUNET_FS_unindex_sync_ (uc);
306 signal_unindex_error (uc);
310 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
311 "Sending UNINDEX message to FS service\n");
313 req.header.size = htons (sizeof (struct UnindexMessage));
314 req.header.type = htons (GNUNET_MESSAGE_TYPE_FS_UNINDEX);
316 req.file_id = uc->file_id;
317 GNUNET_break (GNUNET_OK ==
318 GNUNET_CLIENT_transmit_and_get_response (uc->client,
320 GNUNET_CONSTANTS_SERVICE_TIMEOUT,
322 &process_fs_response,
328 * Connect to the datastore and remove the blocks.
330 * @param uc context for the unindex operation.
333 GNUNET_FS_unindex_do_remove_ (struct GNUNET_FS_UnindexContext *uc)
335 uc->dsh = GNUNET_DATASTORE_connect (uc->h->cfg);
338 uc->state = UNINDEX_STATE_ERROR;
339 uc->emsg = GNUNET_strdup (_("Failed to connect to `datastore' service."));
340 GNUNET_FS_unindex_sync_ (uc);
341 signal_unindex_error (uc);
344 uc->fh = GNUNET_DISK_file_open (uc->filename,
345 GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_NONE);
348 GNUNET_DATASTORE_disconnect (uc->dsh, GNUNET_NO);
350 uc->state = UNINDEX_STATE_ERROR;
351 uc->emsg = GNUNET_strdup (_("Failed to open file for unindexing."));
352 GNUNET_FS_unindex_sync_ (uc);
353 signal_unindex_error (uc);
356 uc->tc = GNUNET_FS_tree_encoder_create (uc->h,
361 &unindex_progress, &unindex_finish);
362 GNUNET_FS_tree_encoder_next (uc->tc);
367 * Function called once the hash of the file
368 * that is being unindexed has been computed.
370 * @param cls closure, unindex context
371 * @param file_id computed hash, NULL on error
374 GNUNET_FS_unindex_process_hash_ (void *cls, const GNUNET_HashCode * file_id)
376 struct GNUNET_FS_UnindexContext *uc = cls;
379 if (uc->state != UNINDEX_STATE_HASHING)
381 GNUNET_FS_unindex_stop (uc);
386 uc->state = UNINDEX_STATE_ERROR;
387 uc->emsg = GNUNET_strdup (_("Failed to compute hash of file."));
388 GNUNET_FS_unindex_sync_ (uc);
389 signal_unindex_error (uc);
392 uc->file_id = *file_id;
393 uc->state = UNINDEX_STATE_DS_REMOVE;
394 GNUNET_FS_unindex_sync_ (uc);
395 GNUNET_FS_unindex_do_remove_ (uc);
400 * Create SUSPEND event for the given unindex operation
401 * and then clean up our state (without stop signal).
403 * @param cls the 'struct GNUNET_FS_UnindexContext' to signal for
406 GNUNET_FS_unindex_signal_suspend_ (void *cls)
408 struct GNUNET_FS_UnindexContext *uc = cls;
409 struct GNUNET_FS_ProgressInfo pi;
413 GNUNET_CRYPTO_hash_file_cancel (uc->fhc);
416 if (uc->client != NULL)
418 GNUNET_CLIENT_disconnect (uc->client, GNUNET_NO);
423 GNUNET_DATASTORE_disconnect (uc->dsh, GNUNET_NO);
428 GNUNET_FS_tree_encoder_finish (uc->tc, NULL, NULL);
433 GNUNET_DISK_file_close (uc->fh);
436 GNUNET_FS_end_top (uc->h, uc->top);
437 pi.status = GNUNET_FS_STATUS_UNINDEX_SUSPEND;
438 GNUNET_FS_unindex_make_status_ (&pi, uc,
439 (uc->state == UNINDEX_STATE_COMPLETE)
440 ? uc->file_size : 0);
441 GNUNET_break (NULL == uc->client_info);
442 GNUNET_free (uc->filename);
443 GNUNET_free_non_null (uc->serialization);
444 GNUNET_free_non_null (uc->emsg);
452 * @param h handle to the file sharing subsystem
453 * @param filename file to unindex
454 * @param cctx initial value for the client context
455 * @return NULL on error, otherwise handle
457 struct GNUNET_FS_UnindexContext *
458 GNUNET_FS_unindex_start (struct GNUNET_FS_Handle *h,
459 const char *filename, void *cctx)
461 struct GNUNET_FS_UnindexContext *ret;
462 struct GNUNET_FS_ProgressInfo pi;
465 if (GNUNET_OK != GNUNET_DISK_file_size (filename, &size, GNUNET_YES))
467 ret = GNUNET_malloc (sizeof (struct GNUNET_FS_UnindexContext));
469 ret->filename = GNUNET_strdup (filename);
470 ret->start_time = GNUNET_TIME_absolute_get ();
471 ret->file_size = size;
472 ret->client_info = cctx;
473 GNUNET_FS_unindex_sync_ (ret);
474 pi.status = GNUNET_FS_STATUS_UNINDEX_START;
475 pi.value.unindex.eta = GNUNET_TIME_UNIT_FOREVER_REL;
476 GNUNET_FS_unindex_make_status_ (&pi, ret, 0);
477 ret->fhc = GNUNET_CRYPTO_hash_file (GNUNET_SCHEDULER_PRIORITY_IDLE,
480 &GNUNET_FS_unindex_process_hash_, ret);
481 ret->top = GNUNET_FS_make_top (h, &GNUNET_FS_unindex_signal_suspend_, ret);
487 * Clean up after completion of an unindex operation.
492 GNUNET_FS_unindex_stop (struct GNUNET_FS_UnindexContext *uc)
494 struct GNUNET_FS_ProgressInfo pi;
498 GNUNET_CRYPTO_hash_file_cancel (uc->fhc);
501 if (uc->client != NULL)
503 GNUNET_CLIENT_disconnect (uc->client, GNUNET_NO);
508 GNUNET_DATASTORE_disconnect (uc->dsh, GNUNET_NO);
513 GNUNET_FS_tree_encoder_finish (uc->tc, NULL, NULL);
518 GNUNET_DISK_file_close (uc->fh);
521 GNUNET_FS_end_top (uc->h, uc->top);
522 if (uc->serialization != NULL)
524 GNUNET_FS_remove_sync_file_ (uc->h, GNUNET_FS_SYNC_PATH_MASTER_UNINDEX,
526 GNUNET_free (uc->serialization);
527 uc->serialization = NULL;
529 pi.status = GNUNET_FS_STATUS_UNINDEX_STOPPED;
530 pi.value.unindex.eta = GNUNET_TIME_UNIT_ZERO;
531 GNUNET_FS_unindex_make_status_ (&pi, uc,
532 (uc->state == UNINDEX_STATE_COMPLETE)
533 ? uc->file_size : 0);
534 GNUNET_break (NULL == uc->client_info);
535 GNUNET_free (uc->filename);
539 /* end of fs_unindex.c */