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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 backenddb/pg_lookup_refunds.c
* @brief Implementation of the lookup_refunds function for Postgres
* @author Iván Ávalos
*/
#include "platform.h"
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "pg_lookup_refunds.h"
#include "pg_helper.h"
/**
* Closure for #lookup_refunds_cb().
*/
struct LookupRefundsContext
{
/**
* Function to call for each refund.
*/
TALER_MERCHANTDB_RefundCallback rc;
/**
* Closure for @e rc.
*/
void *rc_cls;
/**
* Plugin context.
*/
struct PostgresClosure *pg;
/**
* Transaction result.
*/
enum GNUNET_DB_QueryStatus qs;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls of type `struct LookupRefundsContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
lookup_refunds_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct LookupRefundsContext *lrc = cls;
for (unsigned int i = 0; i<num_results; i++)
{
struct TALER_CoinSpendPublicKeyP coin_pub;
struct TALER_Amount refund_amount;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
&coin_pub),
TALER_PQ_result_spec_amount_with_currency ("refund_amount",
&refund_amount),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
lrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
lrc->rc (lrc->rc_cls,
&coin_pub,
&refund_amount);
GNUNET_PQ_cleanup_result (rs); /* technically useless here */
}
lrc->qs = num_results;
}
enum GNUNET_DB_QueryStatus
TMH_PG_lookup_refunds (
void *cls,
const char *instance_id,
const struct TALER_PrivateContractHashP *h_contract_terms,
TALER_MERCHANTDB_RefundCallback rc,
void *rc_cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_string (instance_id),
GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
GNUNET_PQ_query_param_end
};
struct LookupRefundsContext lrc = {
.rc = rc,
.rc_cls = rc_cls,
.pg = pg
};
enum GNUNET_DB_QueryStatus qs;
/* no preflight check here, run in transaction by caller! */
TALER_LOG_DEBUG ("Looking for refund of h_contract_terms %s at `%s'\n",
GNUNET_h2s (&h_contract_terms->hash),
instance_id);
check_connection (pg);
PREPARE (pg,
"lookup_refunds",
"SELECT"
" coin_pub"
",refund_amount"
" FROM merchant_refunds"
" WHERE order_serial="
" (SELECT order_serial"
" FROM merchant_contract_terms"
" WHERE h_contract_terms=$2"
" AND merchant_serial="
" (SELECT merchant_serial"
" FROM merchant_instances"
" WHERE merchant_id=$1))");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"lookup_refunds",
params,
&lookup_refunds_cb,
&lrc);
if (0 >= qs)
return qs;
return lrc.qs;
}
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