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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
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22 * @file fs/fs_dirmetascan.c
23 * @brief code to asynchronously build a 'struct GNUNET_FS_ShareTreeItem'
24 * from an on-disk directory for publishing; use the 'gnunet-helper-fs-publish'.
26 * @author Christian Grothoff
29 #include "gnunet_fs_service.h"
30 #include "gnunet_scheduler_lib.h"
35 * An opaque structure a pointer to which is returned to the
36 * caller to be used to control the scanner.
38 struct GNUNET_FS_DirScanner
44 struct GNUNET_HELPER_Handle *helper;
47 * Expanded filename (as given by the scan initiator).
48 * The scanner thread stores a copy here, and frees it when it finishes.
50 char *filename_expanded;
53 * Second argument to helper process.
58 * The function that will be called every time there's a progress
61 GNUNET_FS_DirScannerProgressCallback progress_callback;
64 * A closure for progress_callback.
66 void *progress_callback_cls;
69 * After the scan is finished, it will contain a pointer to the
70 * top-level directory entry in the directory tree built by the
73 struct GNUNET_FS_ShareTreeItem *toplevel;
76 * Current position during processing.
78 struct GNUNET_FS_ShareTreeItem *pos;
81 * Task scheduled when we are done.
83 struct GNUNET_SCHEDULER_Task * stop_task;
86 * Arguments for helper.
94 * Abort the scan. Must not be called from within the progress_callback
97 * @param ds directory scanner structure
100 GNUNET_FS_directory_scan_abort (struct GNUNET_FS_DirScanner *ds)
102 /* terminate helper */
103 if (NULL != ds->helper)
104 GNUNET_HELPER_stop (ds->helper, GNUNET_NO);
107 if (NULL != ds->toplevel)
108 GNUNET_FS_share_tree_free (ds->toplevel);
109 if (NULL != ds->stop_task)
110 GNUNET_SCHEDULER_cancel (ds->stop_task);
111 GNUNET_free_non_null (ds->ex_arg);
112 GNUNET_free (ds->filename_expanded);
118 * Obtain the result of the scan after the scan has signalled
119 * completion. Must not be called prior to completion. The 'ds' is
120 * freed as part of this call.
122 * @param ds directory scanner structure
123 * @return the results of the scan (a directory tree)
125 struct GNUNET_FS_ShareTreeItem *
126 GNUNET_FS_directory_scan_get_result (struct GNUNET_FS_DirScanner *ds)
128 struct GNUNET_FS_ShareTreeItem *result;
130 /* check that we're actually done */
131 GNUNET_assert (NULL == ds->helper);
132 /* preserve result */
133 result = ds->toplevel;
135 GNUNET_FS_directory_scan_abort (ds);
141 * Move in the directory from the given position to the next file
144 * @param pos current position
145 * @return next file, NULL for none
147 static struct GNUNET_FS_ShareTreeItem *
148 advance (struct GNUNET_FS_ShareTreeItem *pos)
152 GNUNET_assert (NULL != pos);
153 moved = 0; /* must not terminate, even on file, otherwise "normal" */
154 while ( (pos->is_directory == GNUNET_YES) ||
157 if ( (moved != -1) &&
158 (NULL != pos->children_head) )
160 pos = pos->children_head;
161 moved = 1; /* can terminate if file */
164 if (NULL != pos->next)
167 moved = 1; /* can terminate if file */
170 if (NULL != pos->parent)
173 moved = -1; /* force move to 'next' or 'parent' */
176 /* no more options, end of traversal */
184 * Add another child node to the tree.
186 * @param parent parent of the child, NULL for top level
187 * @param filename name of the file or directory
188 * @param is_directory GNUNET_YES for directories
189 * @return new entry that was just created
191 static struct GNUNET_FS_ShareTreeItem *
192 expand_tree (struct GNUNET_FS_ShareTreeItem *parent,
193 const char *filename,
196 struct GNUNET_FS_ShareTreeItem *chld;
199 chld = GNUNET_new (struct GNUNET_FS_ShareTreeItem);
200 chld->parent = parent;
201 chld->filename = GNUNET_strdup (filename);
202 GNUNET_asprintf (&chld->short_filename,
204 GNUNET_STRINGS_get_short_name (filename),
205 is_directory == GNUNET_YES ? "/" : "");
206 /* make sure we do not end with '//' */
207 slen = strlen (chld->short_filename);
209 (chld->short_filename[slen-1] == '/') &&
210 (chld->short_filename[slen-2] == '/') )
211 chld->short_filename[slen-1] = '\0';
212 chld->is_directory = is_directory;
214 GNUNET_CONTAINER_DLL_insert (parent->children_head,
215 parent->children_tail,
222 * Task run last to shut everything down.
224 * @param cls the 'struct GNUNET_FS_DirScanner'
227 finish_scan (void *cls)
229 struct GNUNET_FS_DirScanner *ds = cls;
231 ds->stop_task = NULL;
232 if (NULL != ds->helper)
234 GNUNET_HELPER_stop (ds->helper, GNUNET_NO);
237 ds->progress_callback (ds->progress_callback_cls,
239 GNUNET_FS_DIRSCANNER_FINISHED);
244 * Called every time there is data to read from the scanner.
245 * Calls the scanner progress handler.
247 * @param cls the closure (directory scanner object)
248 * @param msg message from the helper process
251 process_helper_msgs (void *cls,
252 const struct GNUNET_MessageHeader *msg)
254 struct GNUNET_FS_DirScanner *ds = cls;
255 const char *filename;
259 fprintf (stderr, "DMS parses %u-byte message of type %u\n",
260 (unsigned int) ntohs (msg->size),
261 (unsigned int) ntohs (msg->type));
263 left = ntohs (msg->size) - sizeof (struct GNUNET_MessageHeader);
264 filename = (const char*) &msg[1];
265 switch (ntohs (msg->type))
267 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_PROGRESS_FILE:
268 if (filename[left-1] != '\0')
273 ds->progress_callback (ds->progress_callback_cls,
275 GNUNET_FS_DIRSCANNER_FILE_START);
276 if (NULL == ds->toplevel)
277 ds->toplevel = expand_tree (ds->pos,
278 filename, GNUNET_NO);
280 (void) expand_tree (ds->pos,
281 filename, GNUNET_NO);
283 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_PROGRESS_DIRECTORY:
284 if (filename[left-1] != '\0')
289 if (0 == strcmp ("..", filename))
296 ds->pos = ds->pos->parent;
299 ds->progress_callback (ds->progress_callback_cls,
300 filename, GNUNET_YES,
301 GNUNET_FS_DIRSCANNER_FILE_START);
302 ds->pos = expand_tree (ds->pos,
303 filename, GNUNET_YES);
304 if (NULL == ds->toplevel)
305 ds->toplevel = ds->pos;
307 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_ERROR:
309 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_SKIP_FILE:
310 if ('\0' != filename[left-1])
312 ds->progress_callback (ds->progress_callback_cls,
313 filename, GNUNET_SYSERR,
314 GNUNET_FS_DIRSCANNER_FILE_IGNORED);
316 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_COUNTING_DONE:
322 if (NULL == ds->toplevel)
327 ds->progress_callback (ds->progress_callback_cls,
329 GNUNET_FS_DIRSCANNER_ALL_COUNTED);
330 ds->pos = ds->toplevel;
331 if (GNUNET_YES == ds->pos->is_directory)
332 ds->pos = advance (ds->pos);
334 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_META_DATA:
344 end = memchr (filename, 0, left);
351 nlen = end - filename;
353 if (0 != strcmp (filename,
359 ds->progress_callback (ds->progress_callback_cls,
360 filename, GNUNET_YES,
361 GNUNET_FS_DIRSCANNER_EXTRACT_FINISHED);
364 ds->pos->meta = GNUNET_CONTAINER_meta_data_deserialize (end, left);
365 if (NULL == ds->pos->meta)
370 /* having full filenames is too dangerous; always make sure we clean them up */
371 GNUNET_CONTAINER_meta_data_delete (ds->pos->meta,
372 EXTRACTOR_METATYPE_FILENAME,
374 /* instead, put in our 'safer' original filename */
375 GNUNET_CONTAINER_meta_data_insert (ds->pos->meta, "<libgnunetfs>",
376 EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME,
377 EXTRACTOR_METAFORMAT_UTF8, "text/plain",
378 ds->pos->short_filename,
379 strlen (ds->pos->short_filename) + 1);
381 ds->pos->ksk_uri = GNUNET_FS_uri_ksk_create_from_meta_data (ds->pos->meta);
382 ds->pos = advance (ds->pos);
385 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_FINISHED:
396 if (NULL == ds->toplevel)
401 ds->stop_task = GNUNET_SCHEDULER_add_now (&finish_scan,
408 ds->progress_callback (ds->progress_callback_cls,
410 GNUNET_FS_DIRSCANNER_INTERNAL_ERROR);
416 * Function called if our helper process died.
418 * @param cls the 'struct GNUNET_FS_DirScanner' callback.
421 helper_died_cb (void *cls)
423 struct GNUNET_FS_DirScanner *ds = cls;
426 if (NULL != ds->stop_task)
427 return; /* normal death, was finished */
428 ds->progress_callback (ds->progress_callback_cls,
430 GNUNET_FS_DIRSCANNER_INTERNAL_ERROR);
435 * Start a directory scanner thread.
437 * @param filename name of the directory to scan
438 * @param disable_extractor #GNUNET_YES to not run libextractor on files (only
440 * @param ex if not NULL, must be a list of extra plugins for extractor
441 * @param cb the callback to call when there are scanning progress messages
442 * @param cb_cls closure for 'cb'
443 * @return directory scanner object to be used for controlling the scanner
445 struct GNUNET_FS_DirScanner *
446 GNUNET_FS_directory_scan_start (const char *filename,
447 int disable_extractor, const char *ex,
448 GNUNET_FS_DirScannerProgressCallback cb,
452 char *filename_expanded;
453 struct GNUNET_FS_DirScanner *ds;
455 if (0 != STAT (filename, &sbuf))
457 filename_expanded = GNUNET_STRINGS_filename_expand (filename);
458 if (NULL == filename_expanded)
460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
461 "Starting to scan directory `%s'\n",
463 ds = GNUNET_new (struct GNUNET_FS_DirScanner);
464 ds->progress_callback = cb;
465 ds->progress_callback_cls = cb_cls;
466 ds->filename_expanded = filename_expanded;
467 if (disable_extractor)
468 ds->ex_arg = GNUNET_strdup ("-");
470 ds->ex_arg = (NULL != ex) ? GNUNET_strdup (ex) : NULL;
471 ds->args[0] = "gnunet-helper-fs-publish";
472 ds->args[1] = ds->filename_expanded;
473 ds->args[2] = ds->ex_arg;
475 ds->helper = GNUNET_HELPER_start (GNUNET_NO,
476 "gnunet-helper-fs-publish",
478 &process_helper_msgs,
479 &helper_died_cb, ds);
480 if (NULL == ds->helper)
482 GNUNET_free (filename_expanded);
490 /* end of fs_dirmetascan.c */