diff options
Diffstat (limited to 'src/backenddb/pg_lookup_deposits_by_contract_and_coin.c')
| -rw-r--r-- | src/backenddb/pg_lookup_deposits_by_contract_and_coin.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c b/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c new file mode 100644 index 00000000..089543ea --- /dev/null +++ b/src/backenddb/pg_lookup_deposits_by_contract_and_coin.c @@ -0,0 +1,328 @@ +/* + 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/> + */ +/** + * @file backenddb/pg_lookup_deposits_by_contract_and_coin.c + * @brief Implementation of the lookup_deposits_by_contract_and_coin function for Postgres + * @author Iván Ávalos + */ +#include "platform.h" +#include <taler/taler_error_codes.h> +#include <taler/taler_dbevents.h> +#include <taler/taler_pq_lib.h> +#include "pg_lookup_deposits_by_contract_and_coin.h" +#include "pg_helper.h" + +/** + * Closure for #lookup_deposits_by_contract_and_coin_cb(). + */ +struct LookupDepositsByCnCContext +{ + /** + * Function to call for each deposit. + */ + TALER_MERCHANTDB_CoinDepositCallback cb; + + /** + * Closure for @e cb. + */ + void *cb_cls; + + /** + * Plugin context. + */ + struct PostgresClosure *pg; + + /** + * Total amount refunded on this coin and contract. + */ + struct TALER_Amount refund_total; + + /** + * Transaction result. + */ + enum GNUNET_DB_QueryStatus qs; +}; + + +/** + * Function to be called with the results of a SELECT statement + * that has returned @a num_results results. + * + * @param cls of type `struct LookupDepositsByCnCContext *` + * @param result the postgres result + * @param num_results the number of results in @a result + */ +static void +lookup_refunds_cb (void *cls, + PGresult *result, + unsigned int num_results) +{ + struct LookupDepositsByCnCContext *ldcc = cls; + + for (unsigned int i = 0; i<num_results; i++) + { + struct TALER_Amount refund_amount; + struct GNUNET_PQ_ResultSpec rs[] = { + TALER_PQ_result_spec_amount_with_currency ("refund_amount", + &refund_amount), + GNUNET_PQ_result_spec_end + }; + + if (GNUNET_OK != + GNUNET_PQ_extract_result (result, + rs, + i)) + { + GNUNET_break (0); + ldcc->qs = GNUNET_DB_STATUS_HARD_ERROR; + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Coin had refund of %s\n", + TALER_amount2s (&refund_amount)); + if (0 == i) + ldcc->refund_total = refund_amount; + else + GNUNET_assert (0 <= + TALER_amount_add (&ldcc->refund_total, + &ldcc->refund_total, + &refund_amount)); + GNUNET_PQ_cleanup_result (rs); /* technically useless here */ + } +} + + +/** + * Function to be called with the results of a SELECT statement + * that has returned @a num_results results. + * + * @param cls of type `struct LookupDepositsByCnCContext *` + * @param result the postgres result + * @param num_results the number of results in @a result + */ +static void +lookup_deposits_by_contract_and_coin_cb (void *cls, + PGresult *result, + unsigned int num_results) +{ + struct LookupDepositsByCnCContext *ldcc = cls; + + for (unsigned int i = 0; i<num_results; i++) + { + char *exchange_url; + struct TALER_Amount amount_with_fee; + struct TALER_Amount deposit_fee; + struct TALER_Amount refund_fee; + struct TALER_Amount wire_fee; + struct TALER_MerchantWireHashP h_wire; + struct GNUNET_TIME_Timestamp deposit_timestamp; + struct GNUNET_TIME_Timestamp refund_deadline; + struct TALER_ExchangeSignatureP exchange_sig; + struct TALER_ExchangePublicKeyP exchange_pub; + struct GNUNET_PQ_ResultSpec rs[] = { + GNUNET_PQ_result_spec_string ("exchange_url", + &exchange_url), + TALER_PQ_result_spec_amount_with_currency ("amount_with_fee", + &amount_with_fee), + TALER_PQ_result_spec_amount_with_currency ("deposit_fee", + &deposit_fee), + TALER_PQ_result_spec_amount_with_currency ("refund_fee", + &refund_fee), + TALER_PQ_result_spec_amount_with_currency ("wire_fee", + &wire_fee), + GNUNET_PQ_result_spec_auto_from_type ("h_wire", + &h_wire), + GNUNET_PQ_result_spec_timestamp ("deposit_timestamp", + &deposit_timestamp), + GNUNET_PQ_result_spec_timestamp ("refund_deadline", + &refund_deadline), + GNUNET_PQ_result_spec_auto_from_type ("exchange_sig", + &exchange_sig), + GNUNET_PQ_result_spec_auto_from_type ("exchange_pub", + &exchange_pub), + GNUNET_PQ_result_spec_end + }; + + if (GNUNET_OK != + GNUNET_PQ_extract_result (result, + rs, + i)) + { + GNUNET_break (0); + ldcc->qs = GNUNET_DB_STATUS_HARD_ERROR; + return; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Coin original deposit value is %s\n", + TALER_amount2s (&amount_with_fee)); + if (TALER_amount_is_valid (&ldcc->refund_total)) + { + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "Coin had total refunds of %s\n", + TALER_amount2s (&ldcc->refund_total)); + if (1 == + TALER_amount_cmp (&ldcc->refund_total, + &amount_with_fee)) + { + /* Refunds exceeded total deposit? not OK! */ + GNUNET_break (0); + ldcc->qs = GNUNET_DB_STATUS_HARD_ERROR; + return; + } + if (0 == + TALER_amount_cmp (&ldcc->refund_total, + &amount_with_fee)) + { + /* refund_total == amount_with_fee; + in this case, the total contributed to the + wire transfer is zero (as are fees) */ + GNUNET_assert (GNUNET_OK == + TALER_amount_set_zero (ldcc->refund_total.currency, + &amount_with_fee)); + GNUNET_assert (GNUNET_OK == + TALER_amount_set_zero (ldcc->refund_total.currency, + &deposit_fee)); + + } + else + { + /* Compute deposit value by subtracting refunds */ + GNUNET_assert (0 < + TALER_amount_subtract (&amount_with_fee, + &amount_with_fee, + &ldcc->refund_total)); + if (-1 == + TALER_amount_cmp (&amount_with_fee, + &deposit_fee)) + { + /* amount_with_fee < deposit_fee, so after refunds less than + the deposit fee remains; reduce deposit fee to + the remaining value of the coin */ + deposit_fee = amount_with_fee; + } + } + } + ldcc->cb (ldcc->cb_cls, + exchange_url, + &amount_with_fee, + &deposit_fee, + &refund_fee, + &wire_fee, + &h_wire, + deposit_timestamp, + refund_deadline, + &exchange_sig, + &exchange_pub); + GNUNET_PQ_cleanup_result (rs); + } + ldcc->qs = num_results; +} + + +enum GNUNET_DB_QueryStatus +TMH_PG_lookup_deposits_by_contract_and_coin ( + void *cls, + const char *instance_id, + const struct TALER_PrivateContractHashP *h_contract_terms, + const struct TALER_CoinSpendPublicKeyP *coin_pub, + TALER_MERCHANTDB_CoinDepositCallback cb, + void *cb_cls) +{ + struct PostgresClosure *pg = cls; + struct GNUNET_PQ_QueryParam params[] = { + GNUNET_PQ_query_param_string (instance_id), + GNUNET_PQ_query_param_auto_from_type (h_contract_terms), + GNUNET_PQ_query_param_auto_from_type (coin_pub), + GNUNET_PQ_query_param_end + }; + struct LookupDepositsByCnCContext ldcc = { + .cb = cb, + .cb_cls = cb_cls, + .pg = pg + }; + enum GNUNET_DB_QueryStatus qs; + + check_connection (pg); + /* no preflight check here, run in transaction by caller! */ + TALER_LOG_DEBUG ("Looking for refund of h_contract_terms %s at `%s'\n", + GNUNET_h2s (&h_contract_terms->hash), + instance_id); + check_connection (pg); + PREPARE (pg, + "lookup_refunds_by_coin_and_contract", + "SELECT" + " refund_amount" + " FROM merchant_refunds" + /* Join to filter by refunds that actually + did work, not only those we approved */ + " JOIN merchant_refund_proofs" + " USING (refund_serial)" + " WHERE coin_pub=$3" + " AND order_serial=" + " (SELECT order_serial" + " FROM merchant_contract_terms" + " WHERE h_contract_terms=$2" + " AND merchant_serial=" + " (SELECT merchant_serial" + " FROM merchant_instances" + " WHERE merchant_id=$1))"); + qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn, + "lookup_refunds_by_coin_and_contract", + params, + &lookup_refunds_cb, + &ldcc); + if (0 > qs) + return qs; + + PREPARE (pg, + "lookup_deposits_by_contract_and_coin", + "SELECT" + " mcon.exchange_url" + ",dep.amount_with_fee" + ",dep.deposit_fee" + ",dep.refund_fee" + ",mcon.wire_fee" + ",acc.h_wire" + ",mcon.deposit_timestamp" + ",mct.refund_deadline" + ",mcon.exchange_sig" + ",msig.exchange_pub" + " FROM merchant_contract_terms mct" + " JOIN merchant_deposit_confirmations mcon" + " USING (order_serial)" + " JOIN merchant_deposits dep" + " USING (deposit_confirmation_serial)" + " JOIN merchant_exchange_signing_keys msig" + " USING (signkey_serial)" + " JOIN merchant_accounts acc" + " USING (account_serial)" + " WHERE h_contract_terms=$2" + " AND dep.coin_pub=$3" + " AND mct.merchant_serial=" + " (SELECT merchant_serial" + " FROM merchant_instances" + " WHERE merchant_id=$1)"); + + qs = GNUNET_PQ_eval_prepared_multi_select ( + pg->conn, + "lookup_deposits_by_contract_and_coin", + params, + &lookup_deposits_by_contract_and_coin_cb, + &ldcc); + if (0 >= qs) + return qs; + return ldcc.qs; +} |