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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_products.c
* @brief Implementation of the lookup_products 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_products.h"
#include "pg_helper.h"
/**
* Context used for TMH_PG_lookup_products().
*/
struct LookupProductsContext
{
/**
* Function to call with the results.
*/
TALER_MERCHANTDB_ProductsCallback 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 products.
*
* @param[in,out] cls of type `struct LookupProductsContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
lookup_products_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct LookupProductsContext *plc = cls;
for (unsigned int i = 0; i < num_results; i++)
{
char *product_id;
uint64_t product_serial;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_string ("product_id",
&product_id),
GNUNET_PQ_result_spec_uint64 ("product_serial",
&product_serial),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
plc->extract_failed = true;
return;
}
plc->cb (plc->cb_cls,
product_serial,
product_id);
GNUNET_PQ_cleanup_result (rs);
}
}
enum GNUNET_DB_QueryStatus
TMH_PG_lookup_products (void *cls,
const char *instance_id,
uint64_t offset,
int64_t limit,
TALER_MERCHANTDB_ProductsCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
uint64_t plimit = (uint64_t) ((limit < 0) ? -limit : limit);
struct LookupProductsContext plc = {
.cb = cb,
.cb_cls = cb_cls,
/* Can be overwritten by the lookup_products_cb */
.extract_failed = false,
};
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_string (instance_id),
GNUNET_PQ_query_param_uint64 (&offset),
GNUNET_PQ_query_param_uint64 (&plimit),
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
check_connection (pg);
PREPARE (pg,
"lookup_products_asc",
"SELECT"
" product_id"
" ,product_serial"
" FROM merchant_inventory"
" JOIN merchant_instances"
" USING (merchant_serial)"
" WHERE merchant_instances.merchant_id=$1"
" AND product_serial > $2"
" ORDER BY product_serial ASC"
" LIMIT $3");
PREPARE (pg,
"lookup_products_desc",
"SELECT"
" product_id"
" ,product_serial"
" FROM merchant_inventory"
" JOIN merchant_instances"
" USING (merchant_serial)"
" WHERE merchant_instances.merchant_id=$1"
" AND product_serial < $2"
" ORDER BY product_serial DESC"
" LIMIT $3");
qs = GNUNET_PQ_eval_prepared_multi_select (
pg->conn,
(limit > 0)
? "lookup_products_asc"
: "lookup_products_desc",
params,
&lookup_products_cb,
&plc);
/* If there was an error inside lookup_products_cb, return a hard error. */
if (plc.extract_failed)
return GNUNET_DB_STATUS_HARD_ERROR;
return qs;
}
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