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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_templates.c
* @brief Implementation of the lookup_templates function for Postgres
* @author Christian Grothoff
*/
#include "platform.h"
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "pg_lookup_templates.h"
#include "pg_helper.h"
/**
* Context used for TMH_PG_lookup_templates().
*/
struct LookupTemplateContext
{
/**
* Function to call with the results.
*/
TALER_MERCHANTDB_TemplatesCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Did database result extraction fail?
*/
bool extract_failed;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results about template.
*
* @param[in,out] cls of type `struct LookupTemplateContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
lookup_templates_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct LookupTemplateContext *tlc = cls;
for (unsigned int i = 0; i < num_results; i++)
{
char *template_id;
char *template_description;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_string ("template_id",
&template_id),
GNUNET_PQ_result_spec_string ("template_description",
&template_description),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
tlc->extract_failed = true;
return;
}
tlc->cb (tlc->cb_cls,
template_id,
template_description);
GNUNET_PQ_cleanup_result (rs);
}
}
enum GNUNET_DB_QueryStatus
TMH_PG_lookup_templates (void *cls,
const char *instance_id,
TALER_MERCHANTDB_TemplatesCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct LookupTemplateContext tlc = {
.cb = cb,
.cb_cls = cb_cls,
/* Can be overwritten by the lookup_template_cb */
.extract_failed = false,
};
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_string (instance_id),
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
check_connection (pg);
PREPARE (pg,
"lookup_templates",
"SELECT"
" template_id"
",template_description"
" FROM merchant_template"
" JOIN merchant_instances"
" USING (merchant_serial)"
" WHERE merchant_instances.merchant_id=$1");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"lookup_templates",
params,
&lookup_templates_cb,
&tlc);
/* If there was an error inside lookup_templates_cb, return a hard error. */
if (tlc.extract_failed)
return GNUNET_DB_STATUS_HARD_ERROR;
return qs;
}
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