merchant

Merchant backend to process payments, run by merchants
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get_external_refunds_total.c (4126B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2026 Taler Systems SA
      4 
      5    TALER is free software; you can redistribute it and/or modify it under the
      6    terms of the GNU General Public License as published by the Free Software
      7    Foundation; either version 3, or (at your option) any later version.
      8 
      9    TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
     12 
     13    You should have received a copy of the GNU General Public License along with
     14    TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15  */
     16 /**
     17  * @file src/backenddb/get_external_refunds_total.c
     18  * @brief Implementation of the get_external_refunds_total function for Postgres
     19  * @author Bohdan Potuzhnyi
     20  * @author Volodymyr Potuzhnyi
     21  */
     22 #include "platform.h"
     23 #include <taler/taler_pq_lib.h>
     24 #include "merchant-database/get_external_refunds_total.h"
     25 #include "helper.h"
     26 
     27 
     28 enum GNUNET_DB_QueryStatus
     29 TALER_MERCHANTDB_get_external_refunds_total (
     30   struct TALER_MERCHANTDB_PostgresContext *pg,
     31   const char *instance_id,
     32   const char *order_id,
     33   struct TALER_Amount *total,
     34   bool *currency_mismatch)
     35 {
     36   struct GNUNET_PQ_QueryParam params[] = {
     37     GNUNET_PQ_query_param_string (order_id),
     38     GNUNET_PQ_query_param_end
     39   };
     40   uint64_t value_sum;
     41   uint64_t frac_sum;
     42   uint64_t currencies;
     43   char *currency;
     44   struct GNUNET_PQ_ResultSpec rs[] = {
     45     GNUNET_PQ_result_spec_uint64 ("refund_value_sum",
     46                                   &value_sum),
     47     GNUNET_PQ_result_spec_uint64 ("refund_frac_sum",
     48                                   &frac_sum),
     49     GNUNET_PQ_result_spec_uint64 ("currencies",
     50                                   &currencies),
     51     GNUNET_PQ_result_spec_string ("currency",
     52                                   &currency),
     53     GNUNET_PQ_result_spec_end
     54   };
     55   enum GNUNET_DB_QueryStatus qs;
     56 
     57   GNUNET_assert (NULL != pg->current_merchant_id);
     58   GNUNET_assert (0 == strcmp (instance_id,
     59                               pg->current_merchant_id));
     60   *currency_mismatch = false;
     61   /* no preflight check here, run in transaction by caller! */
     62   TMH_PQ_prepare_anon (pg,
     63                        "SELECT"
     64                        " SUM((refund_amount).val)::INT8"
     65                        "   AS refund_value_sum"
     66                        ",SUM((refund_amount).frac)::INT8"
     67                        "   AS refund_frac_sum"
     68                        ",COUNT(DISTINCT (refund_amount).curr)::INT8"
     69                        "   AS currencies"
     70                        ",MIN((refund_amount).curr) AS currency"
     71                        " FROM merchant_refunds_external"
     72                        " WHERE order_serial="
     73                        "  (SELECT order_serial"
     74                        "     FROM merchant_contract_terms"
     75                        "    WHERE order_id=$1)"
     76                        " HAVING COUNT(*) > 0");
     77   qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     78                                                  "",
     79                                                  params,
     80                                                  rs);
     81   if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != qs)
     82     return qs;
     83   if (1 != currencies)
     84   {
     85     /* Refunds in different currencies were recorded; their sum is
     86        meaningless, so we only report the mismatch. */
     87     *currency_mismatch = true;
     88     GNUNET_PQ_cleanup_result (rs);
     89     return qs;
     90   }
     91   if (GNUNET_OK !=
     92       TALER_amount_set_zero (currency,
     93                              total))
     94   {
     95     GNUNET_break (0);
     96     GNUNET_PQ_cleanup_result (rs);
     97     return GNUNET_DB_STATUS_HARD_ERROR;
     98   }
     99   GNUNET_PQ_cleanup_result (rs);
    100   total->value = value_sum + frac_sum / TALER_AMOUNT_FRAC_BASE;
    101   total->fraction = (uint32_t) (frac_sum % TALER_AMOUNT_FRAC_BASE);
    102   if (GNUNET_SYSERR ==
    103       TALER_amount_normalize (total))
    104   {
    105     /* Only reachable if the recorded refunds sum beyond the maximum
    106        representable amount, which the per-order cap prevents. */
    107     GNUNET_break (0);
    108     return GNUNET_DB_STATUS_HARD_ERROR;
    109   }
    110   return qs;
    111 }