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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_purse(
IN in_purse_pub BYTEA,
IN in_merge_sig BYTEA,
IN in_merge_timestamp INT8,
IN in_reserve_expiration INT8,
IN in_reserve_gc INT8,
IN in_reserve_sig BYTEA,
IN in_reserve_quota BOOLEAN,
IN in_purse_fee taler_amount,
IN in_reserve_pub BYTEA,
IN in_wallet_h_payto BYTEA,
OUT out_no_funds BOOLEAN,
OUT out_no_reserve BOOLEAN,
OUT out_conflict BOOLEAN)
LANGUAGE plpgsql
AS $$
BEGIN
-- Store purse merge signature, checks for purse_pub uniqueness
INSERT INTO purse_merges
(partner_serial_id
,reserve_pub
,purse_pub
,merge_sig
,merge_timestamp)
VALUES
(NULL
,in_reserve_pub
,in_purse_pub
,in_merge_sig
,in_merge_timestamp)
ON CONFLICT DO NOTHING;
IF NOT FOUND
THEN
-- Idempotency check: see if an identical record exists.
-- Note that by checking 'merge_sig', we implicitly check
-- identity over everything that the signature covers.
PERFORM
FROM purse_merges
WHERE purse_pub=in_purse_pub
AND merge_sig=in_merge_sig;
IF NOT FOUND
THEN
-- Purse was merged, but to some other reserve. Not allowed.
out_conflict=TRUE;
out_no_reserve=FALSE;
out_no_funds=FALSE;
RETURN;
END IF;
-- "success"
out_conflict=FALSE;
out_no_funds=FALSE;
out_no_reserve=FALSE;
RETURN;
END IF;
out_conflict=FALSE;
PERFORM
FROM exchange.reserves
WHERE reserve_pub=in_reserve_pub;
out_no_reserve = NOT FOUND;
IF (in_reserve_quota)
THEN
-- Increment active purses per reserve (and check this is allowed)
IF (out_no_reserve)
THEN
out_no_funds=TRUE;
RETURN;
END IF;
UPDATE exchange.reserves
SET purses_active=purses_active+1
WHERE reserve_pub=in_reserve_pub
AND purses_active < purses_allowed;
IF NOT FOUND
THEN
out_no_funds=TRUE;
RETURN;
END IF;
ELSE
-- UPDATE reserves balance (and check if balance is enough to pay the fee)
IF (out_no_reserve)
THEN
IF ( (0 != in_purse_fee.val) OR
(0 != in_purse_fee.frac) )
THEN
out_no_funds=TRUE;
RETURN;
END IF;
INSERT INTO exchange.reserves
(reserve_pub
,expiration_date
,gc_date)
VALUES
(in_reserve_pub
,in_reserve_expiration
,in_reserve_gc);
ELSE
UPDATE exchange.reserves
SET
current_balance.frac=(current_balance).frac-in_purse_fee.frac
+ CASE
WHEN (current_balance).frac < in_purse_fee.frac
THEN 100000000
ELSE 0
END,
current_balance.val=(current_balance).val-in_purse_fee.val
- CASE
WHEN (current_balance).frac < in_purse_fee.frac
THEN 1
ELSE 0
END
WHERE reserve_pub=in_reserve_pub
AND ( ((current_balance).val > in_purse_fee.val) OR
( ((current_balance).frac >= in_purse_fee.frac) AND
((current_balance).val >= in_purse_fee.val) ) );
IF NOT FOUND
THEN
out_no_funds=TRUE;
RETURN;
END IF;
END IF;
END IF;
out_no_funds=FALSE;
-- Store account merge signature.
INSERT INTO account_merges
(reserve_pub
,reserve_sig
,purse_pub
,wallet_h_payto)
VALUES
(in_reserve_pub
,in_reserve_sig
,in_purse_pub
,in_wallet_h_payto);
END $$;
COMMENT ON FUNCTION exchange_do_reserve_purse(BYTEA, BYTEA, INT8, INT8, INT8, BYTEA, BOOLEAN, taler_amount, BYTEA, BYTEA)
IS 'Create a purse for a reserve.';
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