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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 pg_list_exchanges.c
* @brief Low-level (statement-level) Postgres database access for the exchange
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_error_codes.h"
#include "taler_dbevents.h"
#include "taler_pq_lib.h"
#include "pg_list_exchanges.h"
#include "pg_helper.h"
/**
* Closure for #exchange_info_cb().
*/
struct ExchangeInfoContext
{
/**
* Function to call for each exchange.
*/
TALER_AUDITORDB_ExchangeCallback cb;
/**
* Closure for @e cb
*/
void *cb_cls;
/**
* Query status to return.
*/
enum GNUNET_DB_QueryStatus qs;
};
/**
* Helper function for #TAH_PG_list_exchanges().
* To be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure of type `struct ExchangeInfoContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
exchange_info_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct ExchangeInfoContext *eic = cls;
for (unsigned int i = 0; i < num_results; i++)
{
struct TALER_MasterPublicKeyP master_pub;
char *exchange_url;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_auto_from_type ("master_pub", &master_pub),
GNUNET_PQ_result_spec_string ("exchange_url", &exchange_url),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
eic->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
eic->qs = i + 1;
eic->cb (eic->cb_cls,
&master_pub,
exchange_url);
GNUNET_free (exchange_url);
}
}
enum GNUNET_DB_QueryStatus
TAH_PG_list_exchanges (void *cls,
TALER_AUDITORDB_ExchangeCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_end
};
struct ExchangeInfoContext eic = {
.cb = cb,
.cb_cls = cb_cls
};
enum GNUNET_DB_QueryStatus qs;
PREPARE (pg,
"auditor_list_exchanges",
"SELECT"
" master_pub"
",exchange_url"
" FROM auditor_exchanges");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"auditor_list_exchanges",
params,
&exchange_info_cb,
&eic);
if (qs > 0)
return eic.qs;
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
return qs;
}
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