diff options
Diffstat (limited to 'src/exchangedb/exchange_do_age_withdraw.sql')
| -rw-r--r-- | src/exchangedb/exchange_do_age_withdraw.sql | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/exchangedb/exchange_do_age_withdraw.sql b/src/exchangedb/exchange_do_age_withdraw.sql new file mode 100644 index 000000000..89a291445 --- /dev/null +++ b/src/exchangedb/exchange_do_age_withdraw.sql @@ -0,0 +1,165 @@ +-- +-- This file is part of TALER +-- Copyright (C) 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 Özgür Kesim + +CREATE OR REPLACE FUNCTION exchange_do_age_withdraw( + IN amount_with_fee taler_amount, + IN rpub BYTEA, + IN rsig BYTEA, + IN now INT8, + IN min_reserve_gc INT8, + IN h_commitment BYTEA, + IN maximum_age_committed INT2, -- in years ϵ [0,1..) + IN noreveal_index INT2, + IN blinded_evs BYTEA[], + IN denom_serials INT8[], + IN denom_sigs BYTEA[], + OUT reserve_found BOOLEAN, + OUT balance_ok BOOLEAN, + OUT reserve_balance taler_amount, + OUT age_ok BOOLEAN, + OUT required_age INT2, -- in years ϵ [0,1..) + OUT reserve_birthday INT4, + OUT conflict BOOLEAN) +LANGUAGE plpgsql +AS $$ +DECLARE + reserve RECORD; + difference RECORD; + balance taler_amount; + not_before date; + earliest_date 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 + ,birthday + ,gc_date + INTO reserve + FROM exchange.reserves + WHERE reserves.reserve_pub=rpub; + +IF NOT FOUND +THEN + reserve_found=FALSE; + age_ok = FALSE; + required_age=-1; + conflict=FALSE; + reserve_balance.val = 0; + reserve_balance.frac = 0; + balance_ok=FALSE; + RETURN; +END IF; + +reserve_found = TRUE; +conflict=FALSE; -- not really yet determined + +reserve_balance = reserve.current_balance; +reserve_birthday = reserve.birthday; + +-- Check age requirements +IF (reserve.birthday <> 0) +THEN + not_before=date '1970-01-01' + reserve.birthday; + earliest_date = current_date - make_interval(maximum_age_committed); + -- + -- 1970-01-01 + birthday == not_before now + -- | | | + -- <.......not allowed......>[<.....allowed range......>] + -- | | | + -- ____*_____________________*_________*________________* timeline + -- | + -- earliest_date == + -- now - maximum_age_committed*year + -- + IF (earliest_date < not_before) + THEN + required_age = extract(year from age(current_date, not_before)); + age_ok = FALSE; + balance_ok=TRUE; -- NOT REALLY + RETURN; + END IF; +END IF; + +age_ok = TRUE; +required_age=0; + +-- Check reserve balance is sufficient. +SELECT * +INTO difference +FROM amount_left_minus_right(reserve_balance + ,amount_with_fee); + +balance_ok = difference.ok; + +IF NOT balance_ok +THEN + RETURN; +END IF; + +balance = difference.diff; + +-- 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; + +-- Write the commitment into the age-withdraw table +INSERT INTO exchange.age_withdraw + (h_commitment + ,max_age + ,amount_with_fee + ,reserve_pub + ,reserve_sig + ,noreveal_index + ,denom_serials + ,h_blind_evs + ,denom_sigs) +VALUES + (h_commitment + ,maximum_age_committed + ,amount_with_fee + ,rpub + ,rsig + ,noreveal_index + ,denom_serials + ,blinded_evs + ,denom_sigs) +ON CONFLICT DO NOTHING; + +IF NOT FOUND +THEN + -- Signal a conflict so that the caller + -- can fetch the actual data from the DB. + conflict=TRUE; + RETURN; +ELSE + conflict=FALSE; +END IF; + +END $$; + +COMMENT ON FUNCTION exchange_do_age_withdraw(taler_amount, BYTEA, BYTEA, INT8, INT8, BYTEA, INT2, INT2, BYTEA[], INT8[], BYTEA[]) + IS 'Checks whether the reserve has sufficient balance for an age-withdraw operation (or the request is repeated and was previously approved) and that age requirements are met. If so updates the database with the result. Includes storing the blinded planchets and denomination signatures, or signaling conflict'; |