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/*
This file is part of TALER
Copyright (C) 2017 GNUnet e.V.
TALER 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.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file exchangedb/exchangedb_fees.c
* @brief Logic to read/write/convert aggregation wire fees (not other fees!)
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_exchangedb_lib.h"
GNUNET_NETWORK_STRUCT_BEGIN
/**
* Structure for wire fees on disk.
*/
struct TALER_WireFeeDiskP
{
/**
* Wire fee details.
*/
struct TALER_MasterWireFeePS wf;
/**
* Signature affirming the above fee structure.
*/
struct TALER_MasterSignatureP master_sig;
};
GNUNET_NETWORK_STRUCT_END
/**
* Convert @a wd disk format to host format.
*
* @param wd aggregate fees, disk format
* @return fees in host format
*/
static struct TALER_EXCHANGEDB_AggregateFees *
wd2af (const struct TALER_WireFeeDiskP *wd)
{
struct TALER_EXCHANGEDB_AggregateFees *af;
af = GNUNET_new (struct TALER_EXCHANGEDB_AggregateFees);
af->start_date = GNUNET_TIME_absolute_ntoh (wd->wf.start_date);
af->end_date = GNUNET_TIME_absolute_ntoh (wd->wf.end_date);
TALER_amount_ntoh (&af->wire_fee,
&wd->wf.wire_fee);
af->master_sig = wd->master_sig;
return af;
}
/**
* Read the current fee structure from disk.
*
* @param cfg configuration to use
* @param wireplugin name of the wire plugin to read fees for
* @return sorted list of aggregation fees, NULL on error
*/
struct TALER_EXCHANGEDB_AggregateFees *
TALER_EXCHANGEDB_fees_read (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *wireplugin)
{
char *wirefee_base_dir;
char *fn;
struct GNUNET_DISK_FileHandle *fh;
struct TALER_WireFeeDiskP wd;
struct TALER_EXCHANGEDB_AggregateFees *af;
struct TALER_EXCHANGEDB_AggregateFees *endp;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"exchangedb",
"WIREFEE_BASE_DIR",
&wirefee_base_dir))
return NULL;
GNUNET_asprintf (&fn,
"%s/%s.fee",
wirefee_base_dir,
wireplugin);
GNUNET_free (wirefee_base_dir);
fh = GNUNET_DISK_file_open (fn,
GNUNET_DISK_OPEN_READ,
GNUNET_DISK_PERM_NONE);
GNUNET_free (fn);
if (NULL == fh)
return NULL;
af = NULL;
endp = NULL;
while (sizeof (wd) ==
GNUNET_DISK_file_read (fh,
&wd,
sizeof (wd)))
{
struct TALER_EXCHANGEDB_AggregateFees *n;
n = wd2af (&wd);
if ( ( (NULL == af) ||
(endp->end_date.abs_value_us == n->start_date.abs_value_us) ) &&
(n->start_date.abs_value_us < n->end_date.abs_value_us) )
{
/* append to list */
if (NULL != endp)
endp->next = n;
else
af = n;
endp = n;
}
else
{
/* We expect file to be in chronological order! */
GNUNET_break (0);
GNUNET_DISK_file_close (fh);
GNUNET_free (n);
TALER_EXCHANGEDB_fees_free (af);
return NULL;
}
}
GNUNET_DISK_file_close (fh);
return af;
}
/**
* Convert @a af to @a wf.
*
* @param wireplugin name of the wire plugin the fees are for
* @param[in,out] af aggregate fees, host format (updated to round time)
* @param[out] wf aggregate fees, disk / signature format
*/
void
TALER_EXCHANGEDB_fees_2_wf (const char *wireplugin,
struct TALER_EXCHANGEDB_AggregateFees *af,
struct TALER_MasterWireFeePS *wf)
{
(void) GNUNET_TIME_round_abs (&af->start_date);
(void) GNUNET_TIME_round_abs (&af->end_date);
wf->purpose.size = htonl (sizeof (*wf));
wf->purpose.purpose = htonl (TALER_SIGNATURE_MASTER_WIRE_FEES);
GNUNET_CRYPTO_hash (wireplugin,
strlen (wireplugin) + 1,
&wf->h_wire_method);
wf->start_date = GNUNET_TIME_absolute_hton (af->start_date);
wf->end_date = GNUNET_TIME_absolute_hton (af->end_date);
TALER_amount_hton (&wf->wire_fee,
&af->wire_fee);
}
/**
* Write given fee structure to disk.
*
* @param filename where to write the fees
* @param wireplugin which plugin the fees are about
* @param af fee structure to write
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
TALER_EXCHANGEDB_fees_write (const char *filename,
const char *wireplugin,
struct TALER_EXCHANGEDB_AggregateFees *af)
{
struct GNUNET_DISK_FileHandle *fh;
struct TALER_WireFeeDiskP wd;
struct TALER_EXCHANGEDB_AggregateFees *last;
if (GNUNET_OK !=
GNUNET_DISK_directory_create_for_file (filename))
return GNUNET_SYSERR;
fh = GNUNET_DISK_file_open (filename,
GNUNET_DISK_OPEN_WRITE |
GNUNET_DISK_OPEN_TRUNCATE |
GNUNET_DISK_OPEN_CREATE,
GNUNET_DISK_PERM_USER_READ |
GNUNET_DISK_PERM_USER_WRITE);
if (NULL == fh)
return GNUNET_SYSERR;
last = NULL;
while (NULL != af)
{
if ( ( (NULL != last) &&
(last->end_date.abs_value_us != af->start_date.abs_value_us) ) ||
(af->start_date.abs_value_us >= af->end_date.abs_value_us) )
{
/* @a af malformed, refusing to write file that will be rejected */
GNUNET_break (0);
GNUNET_assert (GNUNET_OK ==
GNUNET_DISK_file_close (fh));
return GNUNET_SYSERR;
}
TALER_EXCHANGEDB_fees_2_wf (wireplugin,
af,
&wd.wf);
wd.master_sig = af->master_sig;
af = af->next;
if (sizeof (wd) !=
GNUNET_DISK_file_write (fh,
&wd,
sizeof (wd)))
{
GNUNET_assert (GNUNET_OK ==
GNUNET_DISK_file_close (fh));
return GNUNET_SYSERR;
}
}
GNUNET_assert (GNUNET_OK ==
GNUNET_DISK_file_close (fh));
return GNUNET_OK;
}
/**
* Free @a af data structure
*
* @param af list to free
*/
void
TALER_EXCHANGEDB_fees_free (struct TALER_EXCHANGEDB_AggregateFees *af)
{
struct TALER_EXCHANGEDB_AggregateFees *next;
while (NULL != af)
{
next = af->next;
GNUNET_free (af);
af = next;
}
}
/* end of exchangedb_fees.c */
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