Line data    Source code

       1              : /*
       2              :    This file is part of TALER
       3              :    Copyright (C) 2022 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/iterate_refunds.c
      18              :  * @brief Implementation of the iterate_refunds function for Postgres
      19              :  * @author Iván Ávalos
      20              :  */
      21              : #include "platform.h"
      22              : #include <taler/taler_pq_lib.h>
      23              : #include "merchant-database/iterate_refunds.h"
      24              : #include "helper.h"
      25              : 
      26              : /**
      27              :  * Closure for #lookup_refunds_cb().
      28              :  */
      29              : struct LookupRefundsContext
      30              : {
      31              :   /**
      32              :    * Function to call for each refund.
      33              :    */
      34              :   TALER_MERCHANTDB_RefundCallback rc;
      35              : 
      36              :   /**
      37              :    * Closure for @e rc.
      38              :    */
      39              :   void *rc_cls;
      40              : 
      41              :   /**
      42              :    * Plugin context.
      43              :    */
      44              :   struct TALER_MERCHANTDB_PostgresContext *pg;
      45              : 
      46              :   /**
      47              :    * Transaction result.
      48              :    */
      49              :   enum GNUNET_DB_QueryStatus qs;
      50              : };
      51              : 
      52              : 
      53              : /**
      54              :  * Function to be called with the results of a SELECT statement
      55              :  * that has returned @a num_results results.
      56              :  *
      57              :  * @param cls closure of type `struct LookupRefundsContext *`
      58              :  * @param result the postgres result
      59              :  * @param num_results the number of results in @a result
      60              :  */
      61              : static void
      62          105 : lookup_refunds_cb (void *cls,
      63              :                    PGresult *result,
      64              :                    unsigned int num_results)
      65              : {
      66          105 :   struct LookupRefundsContext *lrc = cls;
      67              : 
      68          116 :   for (unsigned int i = 0; i<num_results; i++)
      69              :   {
      70              :     struct TALER_CoinSpendPublicKeyP coin_pub;
      71              :     struct TALER_Amount refund_amount;
      72           11 :     struct GNUNET_PQ_ResultSpec rs[] = {
      73           11 :       GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
      74              :                                             &coin_pub),
      75           11 :       TALER_PQ_result_spec_amount_with_currency ("refund_amount",
      76              :                                                  &refund_amount),
      77              :       GNUNET_PQ_result_spec_end
      78              :     };
      79              : 
      80           11 :     if (GNUNET_OK !=
      81           11 :         GNUNET_PQ_extract_result (result,
      82              :                                   rs,
      83              :                                   i))
      84              :     {
      85            0 :       GNUNET_break (0);
      86            0 :       lrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
      87            0 :       return;
      88              :     }
      89           11 :     lrc->rc (lrc->rc_cls,
      90              :              &coin_pub,
      91              :              &refund_amount);
      92           11 :     GNUNET_PQ_cleanup_result (rs); /* technically useless here */
      93              :   }
      94          105 :   lrc->qs = num_results;
      95              : }
      96              : 
      97              : 
      98              : enum GNUNET_DB_QueryStatus
      99          105 : TALER_MERCHANTDB_iterate_refunds (
     100              :   struct TALER_MERCHANTDB_PostgresContext *pg,
     101              :   const char *instance_id,
     102              :   const struct TALER_PrivateContractHashP *h_contract_terms,
     103              :   TALER_MERCHANTDB_RefundCallback rc,
     104              :   void *rc_cls)
     105              : {
     106          105 :   struct GNUNET_PQ_QueryParam params[] = {
     107          105 :     GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
     108              :     GNUNET_PQ_query_param_end
     109              :   };
     110          105 :   struct LookupRefundsContext lrc = {
     111              :     .rc = rc,
     112              :     .rc_cls = rc_cls,
     113              :     .pg = pg
     114              :   };
     115              :   enum GNUNET_DB_QueryStatus qs;
     116              : 
     117          105 :   GNUNET_assert (NULL != pg->current_merchant_id);
     118          105 :   GNUNET_assert (0 == strcmp (instance_id,
     119              :                               pg->current_merchant_id));
     120              :   /* no preflight check here, run in transaction by caller! */
     121          105 :   TALER_LOG_DEBUG ("Looking for refund of h_contract_terms %s at `%s'\n",
     122              :                    GNUNET_h2s (&h_contract_terms->hash),
     123              :                    instance_id);
     124          105 :   TMH_PQ_prepare_anon (pg,
     125              :                        "SELECT"
     126              :                        " coin_pub"
     127              :                        ",refund_amount"
     128              :                        " FROM merchant_refunds"
     129              :                        " WHERE order_serial="
     130              :                        "  (SELECT order_serial"
     131              :                        "     FROM merchant_contract_terms"
     132              :                        "    WHERE h_contract_terms=$1)");
     133          105 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     134              :                                              "",
     135              :                                              params,
     136              :                                              &lookup_refunds_cb,
     137              :                                              &lrc);
     138          105 :   if (0 >= qs)
     139           98 :     return qs;
     140            7 :   return lrc.qs;
     141              : }