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--
-- This file is part of TALER
-- Copyright (C) 2014--2023 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/>
--
-- @author Christian Grothoff
-- @author Özgür Kesim
CREATE OR REPLACE FUNCTION exchange_do_batch_withdraw(
IN amount taler_amount,
IN rpub BYTEA,
IN now INT8,
IN min_reserve_gc INT8,
IN do_age_check BOOLEAN,
OUT reserve_found BOOLEAN,
OUT balance_ok BOOLEAN,
OUT reserve_balance taler_amount,
OUT age_ok BOOLEAN,
OUT allowed_maximum_age INT2, -- in years
OUT ruuid INT8)
LANGUAGE plpgsql
AS $$
DECLARE
reserve RECORD;
balance taler_amount;
not_before date;
BEGIN
-- Shards: reserves by reserve_pub (SELECT)
-- reserves_out (INSERT, with CONFLICT detection) by wih
-- reserves by reserve_pub (UPDATE)
-- reserves_in by reserve_pub (SELECT)
-- wire_targets by wire_target_h_payto
SELECT current_balance
,reserve_uuid
,birthday
,gc_date
INTO reserve
FROM exchange.reserves
WHERE reserves.reserve_pub=rpub;
IF NOT FOUND
THEN
-- reserve unknown
reserve_found=FALSE;
balance_ok=FALSE;
reserve_balance.frac = 0;
reserve_balance.val = 0;
age_ok=FALSE;
allowed_maximum_age=0;
ruuid=2;
RETURN;
END IF;
reserve_found=TRUE;
reserve_balance = reserve.current_balance;
ruuid = reserve.reserve_uuid;
-- Check if age requirements are present
IF ((NOT do_age_check) OR (reserve.birthday = 0))
THEN
age_ok = TRUE;
allowed_maximum_age = -1;
ELSE
-- Age requirements are formally not met: The exchange is setup to support
-- age restrictions (do_age_check == TRUE) and the reserve has a
-- birthday set (reserve_birthday != 0), but the client called the
-- batch-withdraw endpoint instead of the age-withdraw endpoint, which it
-- should have.
not_before=date '1970-01-01' + reserve.birthday;
allowed_maximum_age = extract(year from age(current_date, not_before));
balance_ok=FALSE;
age_ok = FALSE;
RETURN;
END IF;
-- Check reserve balance is sufficient.
IF (reserve_balance.val > amount.val)
THEN
IF (reserve_balance.frac >= amount.frac)
THEN
balance.val=reserve_balance.val - amount.val;
balance.frac=reserve_balance.frac - amount.frac;
ELSE
balance.val=reserve_balance.val - amount.val - 1;
balance.frac=reserve_balance.frac + 100000000 - amount.frac;
END IF;
ELSE
IF (reserve_balance.val = amount.val) AND (reserve_balance.frac >= amount.frac)
THEN
balance.val=0;
balance.frac=reserve_balance.frac - amount.frac;
ELSE
balance_ok=FALSE;
RETURN;
END IF;
END IF;
-- Calculate new expiration dates.
min_reserve_gc=GREATEST(min_reserve_gc,reserve.gc_date);
-- Update reserve balance.
UPDATE reserves SET
gc_date=min_reserve_gc
,current_balance=balance
WHERE
reserves.reserve_pub=rpub;
balance_ok=TRUE;
END $$;
COMMENT ON FUNCTION exchange_do_batch_withdraw(taler_amount, BYTEA, INT8, INT8, BOOLEAN)
IS 'Checks whether the reserve has sufficient balance for a withdraw operation (or the request is repeated and was previously approved) and that age requirements are formally met. If so updates the database with the result. Excludes storing the planchets.';
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