exchange

Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_known_coin.c (2637B)

      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_get_known_coin.c
     18  * @brief Implementation of the get_known_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_get_known_coin.h"
     26 #include "pg_helper.h"
     27 
     28 enum GNUNET_DB_QueryStatus
     29 TEH_PG_get_known_coin (void *cls,
     30                        const struct TALER_CoinSpendPublicKeyP *coin_pub,
     31                        struct TALER_CoinPublicInfo *coin_info)
     32 {
     33   struct PostgresClosure *pg = cls;
     34   struct GNUNET_PQ_QueryParam params[] = {
     35     GNUNET_PQ_query_param_auto_from_type (coin_pub),
     36     GNUNET_PQ_query_param_end
     37   };
     38   struct GNUNET_PQ_ResultSpec rs[] = {
     39     GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
     40                                           &coin_info->denom_pub_hash),
     41     GNUNET_PQ_result_spec_allow_null (
     42       GNUNET_PQ_result_spec_auto_from_type ("age_commitment_hash",
     43                                             &coin_info->h_age_commitment),
     44       &coin_info->no_age_commitment),
     45     TALER_PQ_result_spec_denom_sig ("denom_sig",
     46                                     &coin_info->denom_sig),
     47     GNUNET_PQ_result_spec_end
     48   };
     49 
     50   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     51               "Getting known coin data for coin %s\n",
     52               TALER_B2S (coin_pub));
     53   coin_info->coin_pub = *coin_pub;
     54   PREPARE (pg,
     55            "get_known_coin",
     56            "SELECT"
     57            " denominations.denom_pub_hash"
     58            ",age_commitment_hash"
     59            ",denom_sig"
     60            " FROM known_coins"
     61            " JOIN denominations USING (denominations_serial)"
     62            " WHERE coin_pub=$1;");
     63   return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     64                                                    "get_known_coin",
     65                                                    params,
     66                                                    rs);
     67 }