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/*
This file is part of GNUnet
(C) 2005-2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file fs/fs_dirmetascan.c
* @brief code to asynchronously build a 'struct GNUNET_FS_ShareTreeItem'
* from an on-disk directory for publishing; use the 'gnunet-helper-fs-publish'.
* @author LRN
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_fs_service.h"
#include "gnunet_scheduler_lib.h"
#include <pthread.h>
/**
* An opaque structure a pointer to which is returned to the
* caller to be used to control the scanner.
*/
struct GNUNET_FS_DirScanner
{
/**
* Helper process.
*/
struct GNUNET_HELPER_Handle *helper;
/**
* Expanded filename (as given by the scan initiator).
* The scanner thread stores a copy here, and frees it when it finishes.
*/
char *filename_expanded;
/**
* Second argument to helper process.
*/
char *ex_arg;
/**
* The function that will be called every time there's a progress
* message.
*/
GNUNET_FS_DirScannerProgressCallback progress_callback;
/**
* A closure for progress_callback.
*/
void *progress_callback_cls;
/**
* After the scan is finished, it will contain a pointer to the
* top-level directory entry in the directory tree built by the
* scanner. Must only be manipulated by the thread for the
* duration of the thread's runtime.
*/
struct GNUNET_FS_ShareTreeItem *toplevel;
};
/**
* Abort the scan.
*
* @param ds directory scanner structure
*/
void
GNUNET_FS_directory_scan_abort (struct GNUNET_FS_DirScanner *ds)
{
/* terminate helper */
GNUNET_HELPER_stop (ds->helper);
/* free resources */
if (NULL != ds->toplevel)
GNUNET_FS_share_tree_free (ds->toplevel);
GNUNET_free (ds->ex_arg);
GNUNET_free (ds->filename_expanded);
GNUNET_free (ds);
}
/**
* Obtain the result of the scan after the scan has signalled
* completion. Must not be called prior to completion. The 'ds' is
* freed as part of this call.
*
* @param ds directory scanner structure
* @return the results of the scan (a directory tree)
*/
struct GNUNET_FS_ShareTreeItem *
GNUNET_FS_directory_scan_get_result (struct GNUNET_FS_DirScanner *ds)
{
struct GNUNET_FS_ShareTreeItem *result;
/* check that we're actually done */
GNUNET_assert (NULL == ds->helper);
/* preserve result */
result = ds->toplevel;
ds->toplevel = NULL;
GNUNET_FS_directory_scan_abort (ds);
return result;
}
/**
* Called every time there is data to read from the scanner.
* Calls the scanner progress handler.
*
* @param cls the closure (directory scanner object)
* @param client always NULL
* @param msg message from the helper process
*/
static void
process_helper_msgs (void *cls,
void *client,
const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_FS_DirScanner *ds = cls;
ds++;
#if 0
enum GNUNET_FS_DirScannerProgressUpdateReason reason;
size_t filename_len;
int is_directory;
char *filename;
/* Process message. If message is malformed or can't be read, end the scanner */
/* read successfully, notify client about progress */
ds->progress_callback (ds->progress_callback_cls,
ds,
filename,
is_directory,
reason);
GNUNET_free (filename);
/* having full filenames is too dangerous; always make sure we clean them up */
item->short_filename = GNUNET_strdup (GNUNET_STRINGS_get_short_name (filename));
GNUNET_CONTAINER_meta_data_delete (item->meta,
EXTRACTOR_METATYPE_FILENAME,
NULL, 0);
GNUNET_CONTAINER_meta_data_insert (item->meta, "<libgnunetfs>",
EXTRACTOR_METATYPE_FILENAME,
EXTRACTOR_METAFORMAT_UTF8, "text/plain",
item->short_filename,
strlen (item->short_filename) + 1);
#endif
}
/**
* Start a directory scanner thread.
*
* @param filename name of the directory to scan
* @param GNUNET_YES to not to run libextractor on files (only build a tree)
* @param ex if not NULL, must be a list of extra plugins for extractor
* @param cb the callback to call when there are scanning progress messages
* @param cb_cls closure for 'cb'
* @return directory scanner object to be used for controlling the scanner
*/
struct GNUNET_FS_DirScanner *
GNUNET_FS_directory_scan_start (const char *filename,
int disable_extractor, const char *ex,
GNUNET_FS_DirScannerProgressCallback cb,
void *cb_cls)
{
struct stat sbuf;
char *filename_expanded;
struct GNUNET_FS_DirScanner *ds;
char *args[4];
if (0 != STAT (filename, &sbuf))
return NULL;
filename_expanded = GNUNET_STRINGS_filename_expand (filename);
if (NULL == filename_expanded)
return NULL;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Starting to scan directory `%s'\n",
filename_expanded);
ds = GNUNET_malloc (sizeof (struct GNUNET_FS_DirScanner));
ds->progress_callback = cb;
ds->progress_callback_cls = cb_cls;
ds->filename_expanded = filename_expanded;
ds->ex_arg = GNUNET_strdup ((disable_extractor) ? "-" : ex);
args[0] = "gnunet-helper-fs-publish";
args[1] = ds->filename_expanded;
args[2] = ds->ex_arg;
args[3] = NULL;
ds->helper = GNUNET_HELPER_start ("gnunet-helper-fs-publish",
args,
&process_helper_msgs,
ds);
if (NULL == ds->helper)
{
GNUNET_free (filename_expanded);
GNUNET_free (ds);
return NULL;
}
return ds;
}
/* end of fs_dirmetascan.c */
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