exchange

Base system with REST service to issue digital coins, run by the payment service provider
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select_refunds_by_coin.c (4099B)

      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/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/taler_pq_lib.h"
     22 #include "exchange-database/select_refunds_by_coin.h"
     23 #include "helper.h"
     24 
     25 
     26 /**
     27  * Closure for #get_refunds_cb().
     28  */
     29 struct SelectRefundContext
     30 {
     31   /**
     32    * Function to call on each result.
     33    */
     34   TALER_EXCHANGEDB_RefundCoinCallback cb;
     35 
     36   /**
     37    * Closure for @a cb.
     38    */
     39   void *cb_cls;
     40 
     41   /**
     42    * Plugin context.
     43    */
     44   struct TALER_EXCHANGEDB_PostgresContext *pg;
     45 
     46   /**
     47    * Set to #GNUNET_SYSERR on error.
     48    */
     49   enum GNUNET_GenericReturnValue status;
     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 SelectRefundContext *`
     58  * @param result the postgres result
     59  * @param num_results the number of results in @a result
     60  */
     61 static void
     62 get_refunds_cb (void *cls,
     63                 PGresult *result,
     64                 unsigned int num_results)
     65 {
     66   struct SelectRefundContext *srctx = cls;
     67   struct TALER_EXCHANGEDB_PostgresContext *pg = srctx->pg;
     68 
     69   for (unsigned int i = 0; i<num_results; i++)
     70   {
     71     struct TALER_Amount amount_with_fee;
     72     struct GNUNET_PQ_ResultSpec rs[] = {
     73       TALER_PQ_RESULT_SPEC_AMOUNT ("amount_with_fee",
     74                                    &amount_with_fee),
     75       GNUNET_PQ_result_spec_end
     76     };
     77 
     78     if (GNUNET_OK !=
     79         GNUNET_PQ_extract_result (result,
     80                                   rs,
     81                                   i))
     82     {
     83       GNUNET_break (0);
     84       srctx->status = GNUNET_SYSERR;
     85       return;
     86     }
     87     if (GNUNET_OK !=
     88         srctx->cb (srctx->cb_cls,
     89                    &amount_with_fee))
     90       return;
     91   }
     92 }
     93 
     94 
     95 enum GNUNET_DB_QueryStatus
     96 TALER_EXCHANGEDB_select_refunds_by_coin (
     97   struct TALER_EXCHANGEDB_PostgresContext *pg,
     98   const struct TALER_CoinSpendPublicKeyP *coin_pub,
     99   const struct TALER_MerchantPublicKeyP *merchant_pub,
    100   const struct TALER_PrivateContractHashP *h_contract,
    101   TALER_EXCHANGEDB_RefundCoinCallback cb,
    102   void *cb_cls)
    103 {
    104   enum GNUNET_DB_QueryStatus qs;
    105   struct GNUNET_PQ_QueryParam params[] = {
    106     GNUNET_PQ_query_param_auto_from_type (coin_pub),
    107     GNUNET_PQ_query_param_auto_from_type (merchant_pub),
    108     GNUNET_PQ_query_param_auto_from_type (h_contract),
    109     GNUNET_PQ_query_param_end
    110   };
    111   struct SelectRefundContext srctx = {
    112     .cb = cb,
    113     .cb_cls = cb_cls,
    114     .pg = pg,
    115     .status = GNUNET_OK
    116   };
    117   const char *query = "get_refunds_by_coin_and_contract";
    118 
    119   PREPARE (pg,
    120            query,
    121            "SELECT"
    122            "   ref.amount_with_fee"
    123            " FROM refunds ref"
    124            " JOIN coin_deposits cdep"
    125            "   USING (coin_pub,batch_deposit_serial_id)"
    126            " JOIN batch_deposits bdep"
    127            "   ON (ref.batch_deposit_serial_id = bdep.batch_deposit_serial_id)"
    128            " WHERE ref.coin_pub=$1"
    129            "   AND bdep.merchant_pub=$2"
    130            "   AND bdep.h_contract_terms=$3;");
    131   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    132                                              query,
    133                                              params,
    134                                              &get_refunds_cb,
    135                                              &srctx);
    136   if (GNUNET_SYSERR == srctx.status)
    137     return GNUNET_DB_STATUS_HARD_ERROR;
    138   return qs;
    139 }