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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_global_fee_by_time.c
* @brief Implementation of the lookup_global_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_global_fee_by_time.h"
#include "pg_helper.h"
/**
* Closure for #global_fee_by_time_helper()
*/
struct GlobalFeeLookupContext
{
/**
* Set to the wire fees. Set to invalid if fees conflict over
* the given time period.
*/
struct TALER_GlobalFeeSet *fees;
/**
* Set to timeout of unmerged purses
*/
struct GNUNET_TIME_Relative *purse_timeout;
/**
* Set to history expiration for reserves.
*/
struct GNUNET_TIME_Relative *history_expiration;
/**
* Set to number of free purses per account.
*/
uint32_t *purse_account_limit;
/**
* Plugin context.
*/
struct PostgresClosure *pg;
};
/**
* Helper function for #TEH_PG_lookup_global_fee_by_time().
* Calls the callback with each denomination key.
*
* @param cls a `struct GlobalFeeLookupContext`
* @param result db results
* @param num_results number of results in @a result
*/
static void
global_fee_by_time_helper (void *cls,
PGresult *result,
unsigned int num_results)
{
struct GlobalFeeLookupContext *wlc = cls;
struct PostgresClosure *pg = wlc->pg;
for (unsigned int i = 0; i<num_results; i++)
{
struct TALER_GlobalFeeSet fs;
struct GNUNET_TIME_Relative purse_timeout;
struct GNUNET_TIME_Relative history_expiration;
uint32_t purse_account_limit;
struct GNUNET_PQ_ResultSpec rs[] = {
TALER_PQ_RESULT_SPEC_AMOUNT ("history_fee",
&fs.history),
TALER_PQ_RESULT_SPEC_AMOUNT ("account_fee",
&fs.account),
TALER_PQ_RESULT_SPEC_AMOUNT ("purse_fee",
&fs.purse),
GNUNET_PQ_result_spec_relative_time ("purse_timeout",
&purse_timeout),
GNUNET_PQ_result_spec_relative_time ("history_expiration",
&history_expiration),
GNUNET_PQ_result_spec_uint32 ("purse_account_limit",
&purse_account_limit),
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_GlobalFeeSet));
return;
}
if (0 == i)
{
*wlc->fees = fs;
*wlc->purse_timeout = purse_timeout;
*wlc->history_expiration = history_expiration;
*wlc->purse_account_limit = purse_account_limit;
continue;
}
if ( (0 !=
TALER_global_fee_set_cmp (&fs,
wlc->fees)) ||
(purse_account_limit != *wlc->purse_account_limit) ||
(GNUNET_TIME_relative_cmp (purse_timeout,
!=,
*wlc->purse_timeout)) ||
(GNUNET_TIME_relative_cmp (history_expiration,
!=,
*wlc->history_expiration)) )
{
/* invalidate */
memset (wlc->fees,
0,
sizeof (struct TALER_GlobalFeeSet));
return;
}
}
}
enum GNUNET_DB_QueryStatus
TEH_PG_lookup_global_fee_by_time (
void *cls,
struct GNUNET_TIME_Timestamp start_time,
struct GNUNET_TIME_Timestamp end_time,
struct TALER_GlobalFeeSet *fees,
struct GNUNET_TIME_Relative *purse_timeout,
struct GNUNET_TIME_Relative *history_expiration,
uint32_t *purse_account_limit)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_timestamp (&start_time),
GNUNET_PQ_query_param_timestamp (&end_time),
GNUNET_PQ_query_param_end
};
struct GlobalFeeLookupContext wlc = {
.fees = fees,
.purse_timeout = purse_timeout,
.history_expiration = history_expiration,
.purse_account_limit = purse_account_limit,
.pg = pg
};
PREPARE (pg,
"lookup_global_fee_by_time",
"SELECT"
" history_fee"
",account_fee"
",purse_fee"
",purse_timeout"
",history_expiration"
",purse_account_limit"
" FROM global_fee"
" WHERE end_date > $1"
" AND start_date < $2;");
return GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"lookup_global_fee_by_time",
params,
&global_fee_by_time_helper,
&wlc);
}
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