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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_get_expired_reserves.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_get_expired_reserves.h"
#include "pg_helper.h"
/**
* Closure for #reserve_expired_cb().
*/
struct ExpiredReserveContext
{
/**
* Function to call for each expired reserve.
*/
TALER_EXCHANGEDB_ReserveExpiredCallback rec;
/**
* Closure to give to @e rec.
*/
void *rec_cls;
/**
* Plugin context.
*/
struct PostgresClosure *pg;
/**
* Set to #GNUNET_SYSERR on error.
*/
enum GNUNET_GenericReturnValue status;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
reserve_expired_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct ExpiredReserveContext *erc = cls;
struct PostgresClosure *pg = erc->pg;
enum GNUNET_GenericReturnValue ret;
ret = GNUNET_OK;
for (unsigned int i = 0; i<num_results; i++)
{
struct GNUNET_TIME_Timestamp exp_date;
char *account_details;
struct TALER_ReservePublicKeyP reserve_pub;
struct TALER_Amount remaining_balance;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_timestamp ("expiration_date",
&exp_date),
GNUNET_PQ_result_spec_string ("account_details",
&account_details),
GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
&reserve_pub),
TALER_PQ_RESULT_SPEC_AMOUNT ("current_balance",
&remaining_balance),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
ret = GNUNET_SYSERR;
break;
}
ret = erc->rec (erc->rec_cls,
&reserve_pub,
&remaining_balance,
account_details,
exp_date,
0);
GNUNET_PQ_cleanup_result (rs);
if (GNUNET_OK != ret)
break;
}
erc->status = ret;
}
enum GNUNET_DB_QueryStatus
TEH_PG_get_expired_reserves (void *cls,
struct GNUNET_TIME_Timestamp now,
TALER_EXCHANGEDB_ReserveExpiredCallback rec,
void *rec_cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_timestamp (&now),
GNUNET_PQ_query_param_end
};
struct ExpiredReserveContext ectx = {
.rec = rec,
.rec_cls = rec_cls,
.pg = pg,
.status = GNUNET_OK
};
enum GNUNET_DB_QueryStatus qs;
PREPARE (pg,
"get_expired_reserves",
"WITH ed AS MATERIALIZED ( "
" SELECT * "
" FROM reserves "
" WHERE expiration_date <= $1 "
" AND (current_balance_val != 0 OR current_balance_frac != 0) "
" ORDER BY expiration_date ASC "
" LIMIT 1 "
") "
"SELECT "
" ed.expiration_date "
" ,payto_uri AS account_details "
" ,ed.reserve_pub "
" ,current_balance_val "
" ,current_balance_frac "
"FROM ( "
" SELECT "
" * "
" FROM reserves_in "
" WHERE reserve_pub = ( "
" SELECT reserve_pub FROM ed) "
" ) ri "
"JOIN wire_targets wt ON (ri.wire_source_h_payto = wt.wire_target_h_payto) "
"JOIN ed ON (ri.reserve_pub = ed.reserve_pub);");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"get_expired_reserves",
params,
&reserve_expired_cb,
&ectx);
switch (ectx.status)
{
case GNUNET_SYSERR:
return GNUNET_DB_STATUS_HARD_ERROR;
case GNUNET_NO:
return GNUNET_DB_STATUS_SOFT_ERROR;
case GNUNET_OK:
break;
}
return qs;
}
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