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 backenddb/pg_lookup_refunds.c
      18              :  * @brief Implementation of the lookup_refunds function for Postgres
      19              :  * @author Iván Ávalos
      20              :  */
      21              : #include "platform.h"
      22              : #include <taler/taler_error_codes.h>
      23              : #include <taler/taler_dbevents.h>
      24              : #include <taler/taler_pq_lib.h>
      25              : #include "pg_lookup_refunds.h"
      26              : #include "pg_helper.h"
      27              : 
      28              : /**
      29              :  * Closure for #lookup_refunds_cb().
      30              :  */
      31              : struct LookupRefundsContext
      32              : {
      33              :   /**
      34              :    * Function to call for each refund.
      35              :    */
      36              :   TALER_MERCHANTDB_RefundCallback rc;
      37              : 
      38              :   /**
      39              :    * Closure for @e rc.
      40              :    */
      41              :   void *rc_cls;
      42              : 
      43              :   /**
      44              :    * Plugin context.
      45              :    */
      46              :   struct PostgresClosure *pg;
      47              : 
      48              :   /**
      49              :    * Transaction result.
      50              :    */
      51              :   enum GNUNET_DB_QueryStatus qs;
      52              : };
      53              : 
      54              : 
      55              : /**
      56              :  * Function to be called with the results of a SELECT statement
      57              :  * that has returned @a num_results results.
      58              :  *
      59              :  * @param cls of type `struct LookupRefundsContext *`
      60              :  * @param result the postgres result
      61              :  * @param num_results the number of results in @a result
      62              :  */
      63              : static void
      64           70 : lookup_refunds_cb (void *cls,
      65              :                    PGresult *result,
      66              :                    unsigned int num_results)
      67              : {
      68           70 :   struct LookupRefundsContext *lrc = cls;
      69              : 
      70           70 :   for (unsigned int i = 0; i<num_results; i++)
      71              :   {
      72              :     struct TALER_CoinSpendPublicKeyP coin_pub;
      73              :     struct TALER_Amount refund_amount;
      74            0 :     struct GNUNET_PQ_ResultSpec rs[] = {
      75            0 :       GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
      76              :                                             &coin_pub),
      77            0 :       TALER_PQ_result_spec_amount_with_currency ("refund_amount",
      78              :                                                  &refund_amount),
      79              :       GNUNET_PQ_result_spec_end
      80              :     };
      81              : 
      82            0 :     if (GNUNET_OK !=
      83            0 :         GNUNET_PQ_extract_result (result,
      84              :                                   rs,
      85              :                                   i))
      86              :     {
      87            0 :       GNUNET_break (0);
      88            0 :       lrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
      89            0 :       return;
      90              :     }
      91            0 :     lrc->rc (lrc->rc_cls,
      92              :              &coin_pub,
      93              :              &refund_amount);
      94            0 :     GNUNET_PQ_cleanup_result (rs); /* technically useless here */
      95              :   }
      96           70 :   lrc->qs = num_results;
      97              : }
      98              : 
      99              : 
     100              : enum GNUNET_DB_QueryStatus
     101           70 : TMH_PG_lookup_refunds (
     102              :   void *cls,
     103              :   const char *instance_id,
     104              :   const struct TALER_PrivateContractHashP *h_contract_terms,
     105              :   TALER_MERCHANTDB_RefundCallback rc,
     106              :   void *rc_cls)
     107              : {
     108           70 :   struct PostgresClosure *pg = cls;
     109           70 :   struct GNUNET_PQ_QueryParam params[] = {
     110           70 :     GNUNET_PQ_query_param_string (instance_id),
     111           70 :     GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
     112              :     GNUNET_PQ_query_param_end
     113              :   };
     114           70 :   struct LookupRefundsContext lrc = {
     115              :     .rc = rc,
     116              :     .rc_cls = rc_cls,
     117              :     .pg = pg
     118              :   };
     119              :   enum GNUNET_DB_QueryStatus qs;
     120              : 
     121              :   /* no preflight check here, run in transaction by caller! */
     122           70 :   TALER_LOG_DEBUG ("Looking for refund of h_contract_terms %s at `%s'\n",
     123              :                    GNUNET_h2s (&h_contract_terms->hash),
     124              :                    instance_id);
     125           70 :   check_connection (pg);
     126           70 :   PREPARE (pg,
     127              :            "lookup_refunds",
     128              :            "SELECT"
     129              :            " coin_pub"
     130              :            ",refund_amount"
     131              :            " FROM merchant_refunds"
     132              :            " WHERE order_serial="
     133              :            "  (SELECT order_serial"
     134              :            "     FROM merchant_contract_terms"
     135              :            "    WHERE h_contract_terms=$2"
     136              :            "      AND merchant_serial="
     137              :            "        (SELECT merchant_serial"
     138              :            "           FROM merchant_instances"
     139              :            "          WHERE merchant_id=$1))");
     140           70 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     141              :                                              "lookup_refunds",
     142              :                                              params,
     143              :                                              &lookup_refunds_cb,
     144              :                                              &lrc);
     145           70 :   if (0 >= qs)
     146           70 :     return qs;
     147            0 :   return lrc.qs;
     148              : }