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/*
This file is part of GNUnet.
(C) 2003, 2004, 2006, 2009 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_unindex.c
* @author Krista Bennett
* @author Christian Grothoff
* @brief Unindex file.
*
* TODO:
* - code cleanup (share more with upload.c)
*/
#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_fs_service.h"
#include "gnunet_protocols.h"
#include "fs.h"
/**
* Fill in all of the generic fields for
* an unindex event.
*
* @param pc structure to fill in
* @param sc overall unindex context
*/
static void
make_unindex_status (struct GNUNET_FS_ProgressInfo *pi,
struct GNUNET_FS_UnindexContext *uc)
{
pi->value.unindex.uc = uc;
pi->value.unindex.cctx = uc->client_info;
pi->value.unindex.filename = uc->filename;
pi->value.unindex.size = uc->file_size;
pi->value.unindex.eta
= GNUNET_TIME_calculate_eta (uc->start_time,
uc->unindex_offset,
uc->file_size);
pi->value.publish.duration = GNUNET_TIME_absolute_get_duration (uc->start_time);
pi->value.publish.completed = uc->unindex_offset;
}
/**
* We've encountered an error during
* unindexing. Signal the client.
*
* @param uc context for the failed unindexing operation
* @param emsg the error message
*/
static void
signal_unindex_error (struct GNUNET_FS_UnindexContext *uc,
const char *emsg)
{
struct GNUNET_FS_ProgressInfo pi;
pi.status = GNUNET_FS_STATUS_UNINDEX_ERROR;
make_unindex_status (&pi, uc);
pi.value.unindex.eta = GNUNET_TIME_UNIT_FOREVER_REL;
pi.value.unindex.specifics.error.message = emsg;
uc->client_info
= uc->h->upcb (uc->h->upcb_cls,
&pi);
}
/**
* Function called with the response from the
* FS service to our unindexing request.
*
* @param cls closure, unindex context
* @param msg NULL on timeout, otherwise the response
*/
static void
process_fs_response (void *cls,
const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_FS_UnindexContext *uc = cls;
GNUNET_CLIENT_disconnect (uc->client);
uc->client = NULL;
if (uc->state != UNINDEX_STATE_FS_NOTIFY)
{
GNUNET_FS_unindex_stop (uc);
return;
}
if (NULL == msg)
{
uc->state = UNINDEX_STATE_ERROR;
signal_unindex_error (uc,
_("Timeout waiting for `fs' service."));
return;
}
if (ntohs(msg->type) != GNUNET_MESSAGE_TYPE_FS_UNINDEX_OK)
{
uc->state = UNINDEX_STATE_ERROR;
signal_unindex_error (uc,
_("Invalid response from `fs' service."));
return;
}
uc->state = UNINDEX_STATE_DS_REMOVE;
uc->dsh = GNUNET_DATASTORE_connect (uc->h->cfg,
uc->h->sched);
if (NULL == uc->dsh)
{
uc->state = UNINDEX_STATE_ERROR;
signal_unindex_error (uc,
_("Failed to connect to `datastore' service."));
return;
}
// FIXME: call shared code with publishing...
}
/**
* Function called once the hash of the file
* that is being unindexed has been computed.
*
* @param cls closure, unindex context
* @param file_id computed hash, NULL on error
*/
static void
process_hash (void *cls,
const GNUNET_HashCode *file_id)
{
struct GNUNET_FS_UnindexContext *uc = cls;
struct UnindexMessage req;
if (uc->state != UNINDEX_STATE_HASHING)
{
GNUNET_FS_unindex_stop (uc);
return;
}
if (file_id == NULL)
{
uc->state = UNINDEX_STATE_ERROR;
signal_unindex_error (uc,
_("Failed to compute hash of file."));
return;
}
uc->file_id = *file_id;
uc->state = UNINDEX_STATE_FS_NOTIFY;
uc->client = GNUNET_CLIENT_connect (uc->h->sched,
"fs",
uc->h->cfg);
req.header.size = htons (sizeof (struct UnindexMessage));
req.header.type = htons (GNUNET_MESSAGE_TYPE_FS_UNINDEX);
req.reserved = 0;
req.file_id = *file_id;
GNUNET_CLIENT_transmit_and_get_response (uc->client,
&req.header,
GNUNET_CONSTANTS_SERVICE_TIMEOUT,
&process_fs_response,
uc);
}
/**
* Unindex a file.
*
* @param h handle to the file sharing subsystem
* @param filename file to unindex
* @return NULL on error, otherwise handle
*/
struct GNUNET_FS_UnindexContext *
GNUNET_FS_unindex (struct GNUNET_FS_Handle *h,
const char *filename)
{
struct GNUNET_FS_UnindexContext *ret;
struct GNUNET_FS_ProgressInfo pi;
uint64_t size;
if (GNUNET_OK !=
GNUNET_DISK_file_size (filename,
&size,
GNUNET_YES))
return NULL;
ret = GNUNET_malloc (sizeof (struct GNUNET_FS_UnindexContext));
ret->h = h;
ret->filename = GNUNET_strdup (filename);
ret->start_time = GNUNET_TIME_absolute_get ();
ret->file_size = size;
// FIXME: make persistent!
pi.status = GNUNET_FS_STATUS_UNINDEX_START;
make_unindex_status (&pi, ret);
pi.value.unindex.eta = GNUNET_TIME_UNIT_FOREVER_REL;
ret->client_info
= h->upcb (h->upcb_cls,
&pi);
GNUNET_CRYPTO_hash_file (h->sched,
GNUNET_SCHEDULER_PRIORITY_IDLE,
GNUNET_NO,
filename,
HASHING_BLOCKSIZE,
&process_hash,
ret);
return ret;
}
/**
* Clean up after completion of an unindex operation.
*
* @param uc handle
*/
void
GNUNET_FS_unindex_stop (struct GNUNET_FS_UnindexContext *uc)
{
struct GNUNET_FS_ProgressInfo pi;
if ( (uc->state != UNINDEX_STATE_COMPLETE) &&
(uc->state != UNINDEX_STATE_ERROR) )
{
uc->state = UNINDEX_STATE_ABORTED;
return;
}
// FIXME: make unpersistent!
pi.status = GNUNET_FS_STATUS_UNINDEX_STOPPED;
make_unindex_status (&pi, uc);
pi.value.unindex.eta = GNUNET_TIME_UNIT_ZERO;
uc->client_info
= uc->h->upcb (uc->h->upcb_cls,
&pi);
GNUNET_break (NULL == uc->client_info);
GNUNET_free (uc->filename);
GNUNET_free (uc);
}
/* end of fs_unindex.c */
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