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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_purse_deposits_by_purse.c (4591B)

      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 exchangedb/pg_select_purse_deposits_by_purse.c
     18  * @brief Implementation of the select_purse_deposits_by_purse 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_purse_deposits_by_purse.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Closure for #purse_refund_coin_helper_cb().
     30  */
     31 struct PurseRefundCoinContext
     32 {
     33 
     34   /**
     35    * Callback to call.
     36    */
     37   TALER_EXCHANGEDB_PurseRefundCoinCallback cb;
     38 
     39   /**
     40    * Closure for @e cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Plugin context.
     46    */
     47   struct PostgresClosure *pg;
     48 
     49   /**
     50    * Status code, set to #GNUNET_SYSERR on hard errors.
     51    */
     52   enum GNUNET_GenericReturnValue status;
     53 };
     54 
     55 
     56 /**
     57  * Helper 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 PurseRefundCoinContext`
     61  * @param result the postgres result
     62  * @param num_results the number of results in @a result
     63  */
     64 static void
     65 purse_refund_coin_helper_cb (void *cls,
     66                              PGresult *result,
     67                              unsigned int num_results)
     68 {
     69   struct PurseRefundCoinContext *dsc = cls;
     70   struct PostgresClosure *pg = dsc->pg;
     71 
     72   for (unsigned int i = 0; i<num_results; i++)
     73   {
     74     struct TALER_Amount amount_with_fee;
     75     struct TALER_CoinSpendPublicKeyP coin_pub;
     76     struct TALER_DenominationPublicKey denom_pub;
     77     uint64_t rowid;
     78     struct GNUNET_PQ_ResultSpec rs[] = {
     79       TALER_PQ_result_spec_denom_pub ("denom_pub",
     80                                       &denom_pub),
     81       TALER_PQ_RESULT_SPEC_AMOUNT ("amount_with_fee",
     82                                    &amount_with_fee),
     83       GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
     84                                             &coin_pub),
     85       GNUNET_PQ_result_spec_uint64 ("purse_deposit_serial_id",
     86                                     &rowid),
     87       GNUNET_PQ_result_spec_end
     88     };
     89     enum GNUNET_GenericReturnValue ret;
     90 
     91     if (GNUNET_OK !=
     92         GNUNET_PQ_extract_result (result,
     93                                   rs,
     94                                   i))
     95     {
     96       GNUNET_break (0);
     97       dsc->status = GNUNET_SYSERR;
     98       return;
     99     }
    100     ret = dsc->cb (dsc->cb_cls,
    101                    rowid,
    102                    &amount_with_fee,
    103                    &coin_pub,
    104                    &denom_pub);
    105     GNUNET_PQ_cleanup_result (rs);
    106     if (GNUNET_OK != ret)
    107       break;
    108   }
    109 }
    110 
    111 
    112 enum GNUNET_DB_QueryStatus
    113 TEH_PG_select_purse_deposits_by_purse (
    114   void *cls,
    115   const struct TALER_PurseContractPublicKeyP *purse_pub,
    116   TALER_EXCHANGEDB_PurseRefundCoinCallback cb,
    117   void *cb_cls)
    118 {
    119   struct PostgresClosure *pg = cls;
    120   struct GNUNET_PQ_QueryParam params[] = {
    121     GNUNET_PQ_query_param_auto_from_type (purse_pub),
    122     GNUNET_PQ_query_param_end
    123   };
    124   struct PurseRefundCoinContext dsc = {
    125     .cb = cb,
    126     .cb_cls = cb_cls,
    127     .pg = pg,
    128     .status = GNUNET_OK
    129   };
    130   enum GNUNET_DB_QueryStatus qs;
    131 
    132   PREPARE (pg,
    133            "audit_get_purse_deposits_by_purse",
    134            "SELECT"
    135            " pd.purse_deposit_serial_id"
    136            ",pd.amount_with_fee"
    137            ",pd.coin_pub"
    138            ",denom.denom_pub"
    139            " FROM purse_deposits pd"
    140            " JOIN known_coins kc"
    141            "   USING (coin_pub)"
    142            " JOIN denominations denom"
    143            "   USING (denominations_serial)"
    144            " WHERE purse_pub=$1;");
    145   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    146                                              "audit_get_purse_deposits_by_purse",
    147                                              params,
    148                                              &purse_refund_coin_helper_cb,
    149                                              &dsc);
    150   if (GNUNET_OK != dsc.status)
    151     return GNUNET_DB_STATUS_HARD_ERROR;
    152   return qs;
    153 }