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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_reserve_open_deposit(
IN in_coin_pub BYTEA,
IN in_known_coin_id INT8,
IN in_coin_sig BYTEA,
IN in_reserve_sig BYTEA,
IN in_reserve_pub BYTEA,
IN in_coin_total_val INT8,
IN in_coin_total_frac INT4,
OUT out_insufficient_funds BOOLEAN)
LANGUAGE plpgsql
AS $$
BEGIN
INSERT INTO exchange.reserves_open_deposits
(reserve_sig
,reserve_pub
,coin_pub
,coin_sig
,contribution_val
,contribution_frac
)
VALUES
(in_reserve_sig
,in_reserve_pub
,in_coin_pub
,in_coin_sig
,in_coin_total_val
,in_coin_total_frac)
ON CONFLICT DO NOTHING;
IF NOT FOUND
THEN
-- Idempotent request known, return success.
out_insufficient_funds=FALSE;
RETURN;
END IF;
-- Check and update balance of the coin.
UPDATE exchange.known_coins
SET
remaining_frac=remaining_frac-in_coin_total_frac
+ CASE
WHEN remaining_frac < in_coin_total_frac
THEN 100000000
ELSE 0
END,
remaining_val=remaining_val-in_coin_total_val
- CASE
WHEN remaining_frac < in_coin_total_frac
THEN 1
ELSE 0
END
WHERE coin_pub=in_coin_pub
AND ( (remaining_val > in_coin_total_val) OR
( (remaining_frac >= in_coin_total_frac) AND
(remaining_val >= in_coin_total_val) ) );
IF NOT FOUND
THEN
-- Insufficient balance.
out_insufficient_funds=TRUE;
RETURN;
END IF;
-- Everything fine, return success!
out_insufficient_funds=FALSE;
END $$;
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