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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 PROCEDURE exchange_do_gc(
IN in_ancient_date INT8,
IN in_now INT8)
LANGUAGE plpgsql
AS $$
DECLARE
reserve_uuid_min INT8; -- minimum reserve UUID still alive
DECLARE
melt_min INT8; -- minimum melt still alive
DECLARE
coin_min INT8; -- minimum known_coin still alive
DECLARE
deposit_min INT8; -- minimum deposit still alive
DECLARE
reserve_out_min INT8; -- minimum reserve_out still alive
DECLARE
denom_min INT8; -- minimum denomination still alive
BEGIN
DELETE FROM exchange.prewire
WHERE finished=TRUE;
DELETE FROM exchange.wire_fee
WHERE end_date < in_ancient_date;
-- TODO: use closing fee as threshold?
DELETE FROM exchange.reserves
WHERE gc_date < in_now
AND current_balance_val = 0
AND current_balance_frac = 0;
SELECT
reserve_out_serial_id
INTO
reserve_out_min
FROM exchange.reserves_out
ORDER BY reserve_out_serial_id ASC
LIMIT 1;
DELETE FROM exchange.recoup
WHERE reserve_out_serial_id < reserve_out_min;
-- FIXME: recoup_refresh lacks GC!
SELECT
reserve_uuid
INTO
reserve_uuid_min
FROM exchange.reserves
ORDER BY reserve_uuid ASC
LIMIT 1;
DELETE FROM exchange.reserves_out
WHERE reserve_uuid < reserve_uuid_min;
-- FIXME: this query will be horribly slow;
-- need to find another way to formulate it...
DELETE FROM exchange.denominations
WHERE expire_legal < in_now
AND denominations_serial NOT IN
(SELECT DISTINCT denominations_serial
FROM exchange.reserves_out)
AND denominations_serial NOT IN
(SELECT DISTINCT denominations_serial
FROM exchange.known_coins
WHERE coin_pub IN
(SELECT DISTINCT coin_pub
FROM exchange.recoup))
AND denominations_serial NOT IN
(SELECT DISTINCT denominations_serial
FROM exchange.known_coins
WHERE coin_pub IN
(SELECT DISTINCT coin_pub
FROM exchange.recoup_refresh));
SELECT
melt_serial_id
INTO
melt_min
FROM exchange.refresh_commitments
ORDER BY melt_serial_id ASC
LIMIT 1;
DELETE FROM exchange.refresh_revealed_coins
WHERE melt_serial_id < melt_min;
DELETE FROM exchange.refresh_transfer_keys
WHERE melt_serial_id < melt_min;
SELECT
known_coin_id
INTO
coin_min
FROM exchange.known_coins
ORDER BY known_coin_id ASC
LIMIT 1;
DELETE FROM exchange.deposits
WHERE known_coin_id < coin_min;
SELECT
deposit_serial_id
INTO
deposit_min
FROM exchange.deposits
ORDER BY deposit_serial_id ASC
LIMIT 1;
DELETE FROM exchange.refunds
WHERE deposit_serial_id < deposit_min;
DELETE FROM exchange.aggregation_tracking
WHERE deposit_serial_id < deposit_min;
SELECT
denominations_serial
INTO
denom_min
FROM exchange.denominations
ORDER BY denominations_serial ASC
LIMIT 1;
DELETE FROM exchange.cs_nonce_locks
WHERE max_denomination_serial <= denom_min;
END $$;
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