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/*
This file is part of TALER
Copyright (C) 2022 Taler Systems SA
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/pg_lookup_wire_fee_by_time.c
* @brief Implementation of the lookup_wire_fee_by_time function for Postgres
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_error_codes.h"
#include "taler_dbevents.h"
#include "taler_pq_lib.h"
#include "pg_lookup_wire_fee_by_time.h"
#include "pg_helper.h"
/**
* Closure for #wire_fee_by_time_helper()
*/
struct WireFeeLookupContext
{
/**
* Set to the wire fees. Set to invalid if fees conflict over
* the given time period.
*/
struct TALER_WireFeeSet *fees;
/**
* Plugin context.
*/
struct PostgresClosure *pg;
};
/**
* Helper function for #TEH_PG_lookup_wire_fee_by_time().
* Calls the callback with the wire fee structure.
*
* @param cls a `struct WireFeeLookupContext`
* @param result db results
* @param num_results number of results in @a result
*/
static void
wire_fee_by_time_helper (void *cls,
PGresult *result,
unsigned int num_results)
{
struct WireFeeLookupContext *wlc = cls;
struct PostgresClosure *pg = wlc->pg;
for (unsigned int i = 0; i<num_results; i++)
{
struct TALER_WireFeeSet fs;
struct GNUNET_PQ_ResultSpec rs[] = {
TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee",
&fs.wire),
TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
&fs.closing),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
/* invalidate */
memset (wlc->fees,
0,
sizeof (struct TALER_WireFeeSet));
return;
}
if (0 == i)
{
*wlc->fees = fs;
continue;
}
if (0 !=
TALER_wire_fee_set_cmp (&fs,
wlc->fees))
{
/* invalidate */
memset (wlc->fees,
0,
sizeof (struct TALER_WireFeeSet));
return;
}
}
}
/**
* Lookup information about known wire fees. Finds all applicable
* fees in the given range. If they are identical, returns the
* respective @a fees. If any of the fees
* differ between @a start_time and @a end_time, the transaction
* succeeds BUT returns an invalid amount for both fees.
*
* @param cls closure
* @param wire_method the wire method to lookup fees for
* @param start_time starting time of fee
* @param end_time end time of fee
* @param[out] fees wire fees for that time period; if
* different fees exists within this time
* period, an 'invalid' amount is returned.
* @return transaction status code
*/
enum GNUNET_DB_QueryStatus
TEH_PG_lookup_wire_fee_by_time (
void *cls,
const char *wire_method,
struct GNUNET_TIME_Timestamp start_time,
struct GNUNET_TIME_Timestamp end_time,
struct TALER_WireFeeSet *fees)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_string (wire_method),
GNUNET_PQ_query_param_timestamp (&start_time),
GNUNET_PQ_query_param_timestamp (&end_time),
GNUNET_PQ_query_param_end
};
struct WireFeeLookupContext wlc = {
.fees = fees,
.pg = pg
};
/* used in #postgres_lookup_wire_fee_by_time() */
PREPARE (pg,
"lookup_wire_fee_by_time",
"SELECT"
" wire_fee_val"
",wire_fee_frac"
",closing_fee_val"
",closing_fee_frac"
" FROM wire_fee"
" WHERE wire_method=$1"
" AND end_date > $2"
" AND start_date < $3;");
return GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"lookup_wire_fee_by_time",
params,
&wire_fee_by_time_helper,
&wlc);
}
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