exchange

Base system with REST service to issue digital coins, run by the payment service provider
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get_known_coin.c (2609B)

      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/get_known_coin.c
     18  * @brief Implementation of the get_known_coin function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/get_known_coin.h"
     23 #include "helper.h"
     24 
     25 enum GNUNET_DB_QueryStatus
     26 TALER_EXCHANGEDB_get_known_coin (struct TALER_EXCHANGEDB_PostgresContext *pg,
     27                                  const struct TALER_CoinSpendPublicKeyP *
     28                                  coin_pub,
     29                                  struct TALER_CoinPublicInfo *coin_info)
     30 {
     31   struct GNUNET_PQ_QueryParam params[] = {
     32     GNUNET_PQ_query_param_auto_from_type (coin_pub),
     33     GNUNET_PQ_query_param_end
     34   };
     35   struct GNUNET_PQ_ResultSpec rs[] = {
     36     GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
     37                                           &coin_info->denom_pub_hash),
     38     GNUNET_PQ_result_spec_allow_null (
     39       GNUNET_PQ_result_spec_auto_from_type ("age_commitment_hash",
     40                                             &coin_info->h_age_commitment),
     41       &coin_info->no_age_commitment),
     42     TALER_PQ_result_spec_denom_sig ("denom_sig",
     43                                     &coin_info->denom_sig),
     44     GNUNET_PQ_result_spec_end
     45   };
     46 
     47   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     48               "Getting known coin data for coin %s\n",
     49               TALER_B2S (coin_pub));
     50   coin_info->coin_pub = *coin_pub;
     51   PREPARE (pg,
     52            "get_known_coin",
     53            "SELECT"
     54            " denominations.denom_pub_hash"
     55            ",age_commitment_hash"
     56            ",denom_sig"
     57            " FROM known_coins"
     58            " JOIN denominations USING (denominations_serial)"
     59            " WHERE coin_pub=$1;");
     60   return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     61                                                    "get_known_coin",
     62                                                    params,
     63                                                    rs);
     64 }