2 This file is part of GNUnet
3 (C) 2005-2012 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 2, 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_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 GNUNET_SCHEDULER_TaskIdentifier stop_task;
86 * Arguments for helper.
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);
107 if (NULL != ds->toplevel)
108 GNUNET_FS_share_tree_free (ds->toplevel);
109 if (GNUNET_SCHEDULER_NO_TASK != 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) ||
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;
198 chld = GNUNET_malloc (sizeof (struct GNUNET_FS_ShareTreeItem));
199 chld->parent = parent;
200 chld->filename = GNUNET_strdup (filename);
201 chld->short_filename = GNUNET_strdup (GNUNET_STRINGS_get_short_name (filename));
202 chld->is_directory = is_directory;
204 GNUNET_CONTAINER_DLL_insert (parent->children_head,
205 parent->children_tail,
212 * Task run last to shut everything down.
214 * @param cls the 'struct GNUNET_FS_DirScanner'
218 finish_scan (void *cls,
219 const struct GNUNET_SCHEDULER_TaskContext *tc)
221 struct GNUNET_FS_DirScanner *ds = cls;
223 ds->stop_task = GNUNET_SCHEDULER_NO_TASK;
224 GNUNET_HELPER_stop (ds->helper);
226 ds->progress_callback (ds->progress_callback_cls,
228 GNUNET_FS_DIRSCANNER_FINISHED);
233 * Called every time there is data to read from the scanner.
234 * Calls the scanner progress handler.
236 * @param cls the closure (directory scanner object)
237 * @param client always NULL
238 * @param msg message from the helper process
241 process_helper_msgs (void *cls,
243 const struct GNUNET_MessageHeader *msg)
245 struct GNUNET_FS_DirScanner *ds = cls;
246 const char *filename;
249 left = ntohs (msg->size) - sizeof (struct GNUNET_MessageHeader);
250 filename = (const char*) &msg[1];
251 switch (ntohs (msg->type))
253 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_PROGRESS_FILE:
254 if (filename[left-1] != '\0')
259 ds->progress_callback (ds->progress_callback_cls,
261 GNUNET_FS_DIRSCANNER_FILE_START);
262 if (NULL == ds->toplevel)
263 ds->toplevel = expand_tree (ds->pos,
264 filename, GNUNET_NO);
266 (void) expand_tree (ds->pos,
267 filename, GNUNET_NO);
269 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_PROGRESS_DIRECTORY:
270 if (filename[left-1] != '\0')
275 if (0 == strcmp ("..", filename))
282 ds->pos = ds->pos->parent;
285 ds->progress_callback (ds->progress_callback_cls,
286 filename, GNUNET_YES,
287 GNUNET_FS_DIRSCANNER_FILE_START);
288 ds->pos = expand_tree (ds->pos,
289 filename, GNUNET_YES);
290 if (NULL == ds->toplevel)
291 ds->toplevel = ds->pos;
293 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_ERROR:
295 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_SKIP_FILE:
296 if (filename[left-1] != '\0')
298 ds->progress_callback (ds->progress_callback_cls,
299 filename, GNUNET_SYSERR,
300 GNUNET_FS_DIRSCANNER_FILE_IGNORED);
302 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_COUNTING_DONE:
308 if (NULL == ds->toplevel)
313 ds->progress_callback (ds->progress_callback_cls,
315 GNUNET_FS_DIRSCANNER_ALL_COUNTED);
316 ds->pos = ds->toplevel;
317 if (ds->pos->is_directory)
318 ds->pos = advance (ds->pos);
320 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_META_DATA:
330 end = memchr (filename, 0, left);
337 nlen = end - filename;
339 if (0 != strcmp (filename,
345 ds->progress_callback (ds->progress_callback_cls,
346 filename, GNUNET_YES,
347 GNUNET_FS_DIRSCANNER_EXTRACT_FINISHED);
350 ds->pos->meta = GNUNET_CONTAINER_meta_data_deserialize (end, left);
351 if (NULL == ds->pos->meta)
356 /* having full filenames is too dangerous; always make sure we clean them up */
357 GNUNET_CONTAINER_meta_data_delete (ds->pos->meta,
358 EXTRACTOR_METATYPE_FILENAME,
360 GNUNET_CONTAINER_meta_data_insert (ds->pos->meta, "<libgnunetfs>",
361 EXTRACTOR_METATYPE_FILENAME,
362 EXTRACTOR_METAFORMAT_UTF8, "text/plain",
363 ds->pos->short_filename,
364 strlen (ds->pos->short_filename) + 1);
366 ds->pos = advance (ds->pos);
369 case GNUNET_MESSAGE_TYPE_FS_PUBLISH_HELPER_FINISHED:
380 if (NULL == ds->toplevel)
385 ds->stop_task = GNUNET_SCHEDULER_add_now (&finish_scan,
392 ds->progress_callback (ds->progress_callback_cls,
394 GNUNET_FS_DIRSCANNER_INTERNAL_ERROR);
399 * Start a directory scanner thread.
401 * @param filename name of the directory to scan
402 * @param GNUNET_YES to not to run libextractor on files (only build a tree)
403 * @param ex if not NULL, must be a list of extra plugins for extractor
404 * @param cb the callback to call when there are scanning progress messages
405 * @param cb_cls closure for 'cb'
406 * @return directory scanner object to be used for controlling the scanner
408 struct GNUNET_FS_DirScanner *
409 GNUNET_FS_directory_scan_start (const char *filename,
410 int disable_extractor, const char *ex,
411 GNUNET_FS_DirScannerProgressCallback cb,
415 char *filename_expanded;
416 struct GNUNET_FS_DirScanner *ds;
418 if (0 != STAT (filename, &sbuf))
420 filename_expanded = GNUNET_STRINGS_filename_expand (filename);
421 if (NULL == filename_expanded)
423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
424 "Starting to scan directory `%s'\n",
426 ds = GNUNET_malloc (sizeof (struct GNUNET_FS_DirScanner));
427 ds->progress_callback = cb;
428 ds->progress_callback_cls = cb_cls;
429 ds->filename_expanded = filename_expanded;
430 if (disable_extractor)
431 ds->ex_arg = GNUNET_strdup ("-");
433 ds->ex_arg = (NULL != ex) ? GNUNET_strdup (ex) : NULL;
434 ds->args[0] = "gnunet-helper-fs-publish";
435 ds->args[1] = ds->filename_expanded;
436 ds->args[2] = ds->ex_arg;
438 ds->helper = GNUNET_HELPER_start ("gnunet-helper-fs-publish",
440 &process_helper_msgs,
442 if (NULL == ds->helper)
444 GNUNET_free (filename_expanded);
452 /* end of fs_dirmetascan.c */