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/*
This file is part of GNUnet.
Copyright (C) 2003, 2004, 2006, 2009 GNUnet e.V.
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 3, 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file fs/fs_list_indexed.c
* @author Christian Grothoff
* @brief provide a list of all indexed files
*/
#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_fs_service.h"
#include "gnunet_protocols.h"
#include "fs_api.h"
/**
* Context for #GNUNET_FS_get_indexed_files().
*/
struct GNUNET_FS_GetIndexedContext
{
/**
* Connection to the FS service.
*/
struct GNUNET_MQ_Handle *mq;
/**
* Function to call for each indexed file.
*/
GNUNET_FS_IndexedFileProcessor iterator;
/**
* Closure for @e iterator.
*/
void *iterator_cls;
/**
* Continuation to trigger at the end.
*/
GNUNET_SCHEDULER_TaskCallback cont;
/**
* Closure for @e cont.
*/
void *cont_cls;
};
/**
* Function called on each response from the FS
* service with information about indexed files.
*
* @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
* @param msg message with indexing information
*/
static void
handle_index_info_end (void *cls,
const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_FS_GetIndexedContext *gic = cls;
(void) gic->iterator (gic->iterator_cls,
NULL,
NULL);
GNUNET_FS_get_indexed_files_cancel (gic);
}
/**
* Check validity of response from the FS
* service with information about indexed files.
*
* @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
* @param iim message with indexing information
*/
static int
check_index_info (void *cls,
const struct IndexInfoMessage *iim)
{
uint16_t msize = ntohs (iim->header.size) - sizeof (*iim);
const char *filename;
filename = (const char *) &iim[1];
if (filename[msize - 1] != '\0')
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Function called on each response from the FS
* service with information about indexed files.
*
* @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
* @param iim message with indexing information
*/
static void
handle_index_info (void *cls,
const struct IndexInfoMessage *iim)
{
struct GNUNET_FS_GetIndexedContext *gic = cls;
const char *filename;
filename = (const char *) &iim[1];
if (GNUNET_OK !=
gic->iterator (gic->iterator_cls,
filename,
&iim->file_id))
{
GNUNET_FS_get_indexed_files_cancel (gic);
return;
}
}
/**
* Generic error handler, called with the appropriate error code and
* the same closure specified at the creation of the message queue.
* Not every message queue implementation supports an error handler.
*
* @param cls closure with the `struct GNUNET_FS_GetIndexedContent *`
* @param error error code
*/
static void
mq_error_handler (void *cls,
enum GNUNET_MQ_Error error)
{
struct GNUNET_FS_GetIndexedContext *gic = cls;
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failed to receive response from `%s' service.\n"),
"fs");
(void) gic->iterator (gic->iterator_cls, NULL, NULL);
GNUNET_FS_get_indexed_files_cancel (gic);
}
/**
* Iterate over all indexed files.
*
* @param h handle to the file sharing subsystem
* @param iterator function to call on each indexed file
* @param iterator_cls closure for iterator
* @return NULL on error ('iter' is not called)
*/
struct GNUNET_FS_GetIndexedContext *
GNUNET_FS_get_indexed_files (struct GNUNET_FS_Handle *h,
GNUNET_FS_IndexedFileProcessor iterator,
void *iterator_cls)
{
struct GNUNET_FS_GetIndexedContext *gic
= GNUNET_new (struct GNUNET_FS_GetIndexedContext);
struct GNUNET_MQ_MessageHandler handlers[] = {
GNUNET_MQ_hd_fixed_size (index_info_end,
GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_END,
struct GNUNET_MessageHeader,
gic),
GNUNET_MQ_hd_var_size (index_info,
GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY,
struct IndexInfoMessage,
gic),
GNUNET_MQ_handler_end ()
};
struct GNUNET_MQ_Envelope *env;
struct GNUNET_MessageHeader *msg;
gic->mq = GNUNET_CLIENT_connect (h->cfg,
"fs",
handlers,
&mq_error_handler,
h);
if (NULL == gic->mq)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failed to not connect to `%s' service.\n"),
"fs");
GNUNET_free (gic);
return NULL;
}
gic->iterator = iterator;
gic->iterator_cls = iterator_cls;
env = GNUNET_MQ_msg (msg,
GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET);
GNUNET_MQ_send (gic->mq,
env);
return gic;
}
/**
* Cancel iteration over all indexed files.
*
* @param gic operation to cancel
*/
void
GNUNET_FS_get_indexed_files_cancel (struct GNUNET_FS_GetIndexedContext *gic)
{
GNUNET_MQ_destroy (gic->mq);
GNUNET_free (gic);
}
/* end of fs_list_indexed.c */
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