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Base system with REST service to issue digital coins, run by the payment service provider
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pg_select_refunds_by_coin.c (4147B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022-2023 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 exchangedb/pg_select_refunds_by_coin.c
     18  * @brief Implementation of the select_refunds_by_coin function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/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_select_refunds_by_coin.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Closure for #get_refunds_cb().
     31  */
     32 struct SelectRefundContext
     33 {
     34   /**
     35    * Function to call on each result.
     36    */
     37   TALER_EXCHANGEDB_RefundCoinCallback cb;
     38 
     39   /**
     40    * Closure for @a cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Plugin context.
     46    */
     47   struct PostgresClosure *pg;
     48 
     49   /**
     50    * Set to #GNUNET_SYSERR on error.
     51    */
     52   enum GNUNET_GenericReturnValue status;
     53 };
     54 
     55 
     56 /**
     57  * Function to be called with the results of a SELECT statement
     58  * that has returned @a num_results results.
     59  *
     60  * @param cls closure of type `struct SelectRefundContext *`
     61  * @param result the postgres result
     62  * @param num_results the number of results in @a result
     63  */
     64 static void
     65 get_refunds_cb (void *cls,
     66                 PGresult *result,
     67                 unsigned int num_results)
     68 {
     69   struct SelectRefundContext *srctx = cls;
     70   struct PostgresClosure *pg = srctx->pg;
     71 
     72   for (unsigned int i = 0; i<num_results; i++)
     73   {
     74     struct TALER_Amount amount_with_fee;
     75     struct GNUNET_PQ_ResultSpec rs[] = {
     76       TALER_PQ_RESULT_SPEC_AMOUNT ("amount_with_fee",
     77                                    &amount_with_fee),
     78       GNUNET_PQ_result_spec_end
     79     };
     80 
     81     if (GNUNET_OK !=
     82         GNUNET_PQ_extract_result (result,
     83                                   rs,
     84                                   i))
     85     {
     86       GNUNET_break (0);
     87       srctx->status = GNUNET_SYSERR;
     88       return;
     89     }
     90     if (GNUNET_OK !=
     91         srctx->cb (srctx->cb_cls,
     92                    &amount_with_fee))
     93       return;
     94   }
     95 }
     96 
     97 
     98 enum GNUNET_DB_QueryStatus
     99 TEH_PG_select_refunds_by_coin (
    100   void *cls,
    101   const struct TALER_CoinSpendPublicKeyP *coin_pub,
    102   const struct TALER_MerchantPublicKeyP *merchant_pub,
    103   const struct TALER_PrivateContractHashP *h_contract,
    104   TALER_EXCHANGEDB_RefundCoinCallback cb,
    105   void *cb_cls)
    106 {
    107   struct PostgresClosure *pg = cls;
    108   enum GNUNET_DB_QueryStatus qs;
    109   struct GNUNET_PQ_QueryParam params[] = {
    110     GNUNET_PQ_query_param_auto_from_type (coin_pub),
    111     GNUNET_PQ_query_param_auto_from_type (merchant_pub),
    112     GNUNET_PQ_query_param_auto_from_type (h_contract),
    113     GNUNET_PQ_query_param_end
    114   };
    115   struct SelectRefundContext srctx = {
    116     .cb = cb,
    117     .cb_cls = cb_cls,
    118     .pg = pg,
    119     .status = GNUNET_OK
    120   };
    121   const char *query = "get_refunds_by_coin_and_contract";
    122 
    123   PREPARE (pg,
    124            query,
    125            "SELECT"
    126            "   ref.amount_with_fee"
    127            " FROM refunds ref"
    128            " JOIN coin_deposits cdep"
    129            "   USING (coin_pub,batch_deposit_serial_id)"
    130            " JOIN batch_deposits bdep"
    131            "   ON (ref.batch_deposit_serial_id = bdep.batch_deposit_serial_id)"
    132            " WHERE ref.coin_pub=$1"
    133            "   AND bdep.merchant_pub=$2"
    134            "   AND bdep.h_contract_terms=$3;");
    135   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    136                                              query,
    137                                              params,
    138                                              &get_refunds_cb,
    139                                              &srctx);
    140   if (GNUNET_SYSERR == srctx.status)
    141     return GNUNET_DB_STATUS_HARD_ERROR;
    142   return qs;
    143 }