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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_recoup_to_reserve(
IN in_reserve_pub BYTEA,
IN in_reserve_out_serial_id INT8,
IN in_coin_blind BYTEA,
IN in_coin_pub BYTEA,
IN in_known_coin_id INT8,
IN in_coin_sig BYTEA,
IN in_reserve_gc INT8,
IN in_reserve_expiration INT8,
IN in_recoup_timestamp INT8,
OUT out_recoup_ok BOOLEAN,
OUT out_internal_failure BOOLEAN,
OUT out_recoup_timestamp INT8)
LANGUAGE plpgsql
AS $$
DECLARE
tmp taler_amount; -- amount recouped
balance taler_amount; -- current balance of the reserve
new_balance taler_amount; -- new balance of the reserve
reserve RECORD;
rval RECORD;
BEGIN
-- Shards: SELECT known_coins (by coin_pub)
-- SELECT recoup (by coin_pub)
-- UPDATE known_coins (by coin_pub)
-- UPDATE reserves (by reserve_pub)
-- INSERT recoup (by coin_pub)
out_internal_failure=FALSE;
-- Check remaining balance of the coin.
SELECT
remaining
INTO
rval
FROM exchange.known_coins
WHERE coin_pub=in_coin_pub;
IF NOT FOUND
THEN
out_internal_failure=TRUE;
out_recoup_ok=FALSE;
RETURN;
END IF;
tmp := rval.remaining;
IF tmp.val + tmp.frac = 0
THEN
-- Check for idempotency
SELECT
recoup_timestamp
INTO
out_recoup_timestamp
FROM exchange.recoup
WHERE coin_pub=in_coin_pub;
out_recoup_ok=FOUND;
RETURN;
END IF;
-- Update balance of the coin.
UPDATE known_coins
SET
remaining.val = 0
,remaining.frac = 0
WHERE coin_pub=in_coin_pub;
-- Get current balance
SELECT current_balance
INTO reserve
FROM reserves
WHERE reserve_pub=in_reserve_pub;
balance = reserve.current_balance;
new_balance.frac=balance.frac+tmp.frac
- CASE
WHEN balance.frac+tmp.frac >= 100000000
THEN 100000000
ELSE 0
END;
new_balance.val=balance.val+tmp.val
+ CASE
WHEN balance.frac+tmp.frac >= 100000000
THEN 1
ELSE 0
END;
-- Credit the reserve and update reserve timers.
UPDATE reserves
SET
current_balance = new_balance,
gc_date=GREATEST(gc_date, in_reserve_gc),
expiration_date=GREATEST(expiration_date, in_reserve_expiration)
WHERE reserve_pub=in_reserve_pub;
IF NOT FOUND
THEN
RAISE NOTICE 'failed to increase reserve balance from recoup';
out_recoup_ok=TRUE;
out_internal_failure=TRUE;
RETURN;
END IF;
INSERT INTO exchange.recoup
(coin_pub
,coin_sig
,coin_blind
,amount
,recoup_timestamp
,reserve_out_serial_id
)
VALUES
(in_coin_pub
,in_coin_sig
,in_coin_blind
,tmp
,in_recoup_timestamp
,in_reserve_out_serial_id);
-- Normal end, everything is fine.
out_recoup_ok=TRUE;
out_recoup_timestamp=in_recoup_timestamp;
END $$;
-- COMMENT ON FUNCTION exchange_do_recoup_to_reserve(INT8, INT4, BYTEA, BOOLEAN, BOOLEAN)
-- IS 'Executes a recoup of a coin that was withdrawn from a reserve';
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