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/*
This file is part of TALER
Copyright (C) 2024 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 auditordb/pg_get_balance.c
* @brief Implementation of the get_balance 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_get_balance.h"
#include "pg_helper.h"
/**
* Closure for #balance_cb().
*/
struct BalanceContext
{
/**
* Where to store results.
*/
struct TALER_Amount **dst;
/**
* Offset in @e dst.
*/
unsigned int off;
/**
* Length of array at @e dst.
*/
unsigned int len;
/**
* Plugin context.
*/
struct PostgresClosure *pg;
/**
* Set to true on failure.
*/
bool failure;
};
/**
* Helper function for #TAH_PG_get_balance().
* To be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure of type `struct BalanceContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
balance_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct BalanceContext *ctx = cls;
struct PostgresClosure *pg = ctx->pg;
GNUNET_assert (num_results <= ctx->len);
for (unsigned int i = 0; i < num_results; i++)
{
bool is_missing = false;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_allow_null (
TALER_PQ_result_spec_amount ("balance",
pg->currency,
ctx->dst[i]),
&is_missing),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
ctx->failure = true;
return;
}
if (is_missing)
memset (ctx->dst[i],
0,
sizeof (struct TALER_Amount));
ctx->off++;
}
}
enum GNUNET_DB_QueryStatus
TAH_PG_get_balance (void *cls,
const char *balance_key,
struct TALER_Amount *balance_value,
...)
{
struct PostgresClosure *pg = cls;
unsigned int cnt = 1;
va_list ap;
va_start (ap,
balance_value);
while (NULL != va_arg (ap,
const char *))
{
cnt++;
(void) va_arg (ap,
struct TALER_Amount *);
}
va_end (ap);
{
const char *keys[cnt];
struct TALER_Amount *dsts[cnt];
unsigned int off = 1;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_array_ptrs_string (cnt,
keys,
pg->conn),
GNUNET_PQ_query_param_end
};
struct BalanceContext ctx = {
.dst = dsts,
.len = cnt,
.pg = pg
};
enum GNUNET_DB_QueryStatus qs;
keys[0] = balance_key;
dsts[0] = balance_value;
va_start (ap,
balance_value);
while (off < cnt)
{
keys[off] = va_arg (ap,
const char *);
dsts[off] = va_arg (ap,
struct TALER_Amount *);
off++;
}
GNUNET_assert (NULL == va_arg (ap,
const char *));
va_end (ap);
PREPARE (pg,
"get_balance",
"SELECT "
" auditor_do_get_balance AS balance"
" FROM auditor_do_get_balance "
"($1);");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"get_balance",
params,
&balance_cb,
&ctx);
GNUNET_PQ_cleanup_query_params_closures (params);
if (ctx.failure)
return GNUNET_DB_STATUS_HARD_ERROR;
if (qs < 0)
return qs;
GNUNET_assert (qs == ctx.off);
return qs;
}
}
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