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--
-- This file is part of TALER
-- Copyright (C) 2014--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/>
--
CREATE OR REPLACE FUNCTION exchange_do_expire_purse(
IN in_start_time INT8,
IN in_end_time INT8,
IN in_now INT8,
OUT out_found BOOLEAN)
LANGUAGE plpgsql
AS $$
DECLARE
my_purse_pub BYTEA;
DECLARE
my_deposit record;
DECLARE
my_in_reserve_quota BOOLEAN;
BEGIN
-- FIXME: we should probably do this in a loop
-- and expire all at once, instead of one per query
SELECT purse_pub
,in_reserve_quota
INTO my_purse_pub
,my_in_reserve_quota
FROM exchange.purse_requests
WHERE (purse_expiration >= in_start_time) AND
(purse_expiration < in_end_time) AND
purse_pub NOT IN (SELECT purse_pub
FROM purse_decision)
ORDER BY purse_expiration ASC
LIMIT 1;
out_found = FOUND;
IF NOT FOUND
THEN
RETURN;
END IF;
INSERT INTO purse_decision
(purse_pub
,action_timestamp
,refunded)
VALUES
(my_purse_pub
,in_now
,TRUE);
IF (my_in_reserve_quota)
THEN
UPDATE reserves
SET purses_active=purses_active-1
WHERE reserve_pub IN
(SELECT reserve_pub
FROM exchange.purse_merges
WHERE purse_pub=my_purse_pub
LIMIT 1);
END IF;
-- restore balance to each coin deposited into the purse
FOR my_deposit IN
SELECT coin_pub
,amount_with_fee
FROM purse_deposits
WHERE purse_pub = my_purse_pub
LOOP
UPDATE known_coins kc SET
remaining.frac=(kc.remaining).frac+(my_deposit.amount_with_fee).frac
- CASE
WHEN (kc.remaining).frac+(my_deposit.amount_with_fee).frac >= 100000000
THEN 100000000
ELSE 0
END,
remaining.val=(kc.remaining).val+(my_deposit.amount_with_fee).val
+ CASE
WHEN (kc.remaining).frac+(my_deposit.amount_with_fee).frac >= 100000000
THEN 1
ELSE 0
END
WHERE coin_pub = my_deposit.coin_pub;
END LOOP;
END $$;
COMMENT ON FUNCTION exchange_do_expire_purse(INT8,INT8,INT8)
IS 'Finds an expired purse in the given time range and refunds the coins (if any).';
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