merchant

Merchant backend to process payments, run by merchants
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pg_lookup_refunds.c (4326B)

      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 lookup_refunds_cb (void *cls,
     65                    PGresult *result,
     66                    unsigned int num_results)
     67 {
     68   struct LookupRefundsContext *lrc = cls;
     69 
     70   for (unsigned int i = 0; i<num_results; i++)
     71   {
     72     struct TALER_CoinSpendPublicKeyP coin_pub;
     73     struct TALER_Amount refund_amount;
     74     struct GNUNET_PQ_ResultSpec rs[] = {
     75       GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
     76                                             &coin_pub),
     77       TALER_PQ_result_spec_amount_with_currency ("refund_amount",
     78                                                  &refund_amount),
     79       GNUNET_PQ_result_spec_end
     80     };
     81 
     82     if (GNUNET_OK !=
     83         GNUNET_PQ_extract_result (result,
     84                                   rs,
     85                                   i))
     86     {
     87       GNUNET_break (0);
     88       lrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     89       return;
     90     }
     91     lrc->rc (lrc->rc_cls,
     92              &coin_pub,
     93              &refund_amount);
     94     GNUNET_PQ_cleanup_result (rs); /* technically useless here */
     95   }
     96   lrc->qs = num_results;
     97 }
     98 
     99 
    100 enum GNUNET_DB_QueryStatus
    101 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   struct PostgresClosure *pg = cls;
    109   struct GNUNET_PQ_QueryParam params[] = {
    110     GNUNET_PQ_query_param_string (instance_id),
    111     GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
    112     GNUNET_PQ_query_param_end
    113   };
    114   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   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   check_connection (pg);
    126   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   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    141                                              "lookup_refunds",
    142                                              params,
    143                                              &lookup_refunds_cb,
    144                                              &lrc);
    145   if (0 >= qs)
    146     return qs;
    147   return lrc.qs;
    148 }