exchange

Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_coin_denomination.c (2526B)

      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_coin_denomination.c
     18  * @brief Implementation of the get_coin_denomination 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_coin_denomination.h"
     26 #include "pg_helper.h"
     27 
     28 enum GNUNET_DB_QueryStatus
     29 TEH_PG_get_coin_denomination (
     30   void *cls,
     31   const struct TALER_CoinSpendPublicKeyP *coin_pub,
     32   uint64_t *known_coin_id,
     33   struct TALER_DenominationHashP *denom_hash)
     34 {
     35   struct PostgresClosure *pg = cls;
     36   struct GNUNET_PQ_QueryParam params[] = {
     37     GNUNET_PQ_query_param_auto_from_type (coin_pub),
     38     GNUNET_PQ_query_param_end
     39   };
     40   struct GNUNET_PQ_ResultSpec rs[] = {
     41     GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
     42                                           denom_hash),
     43     GNUNET_PQ_result_spec_uint64 ("known_coin_id",
     44                                   known_coin_id),
     45     GNUNET_PQ_result_spec_end
     46   };
     47 
     48   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
     49               "Getting coin denomination of coin %s\n",
     50               TALER_B2S (coin_pub));
     51 
     52   /* Used in #postgres_get_coin_denomination() to fetch
     53      the denomination public key hash for
     54      a coin known to the exchange. */
     55   PREPARE (pg,
     56            "get_coin_denomination",
     57            "SELECT"
     58            " denominations.denom_pub_hash"
     59            ",known_coin_id"
     60            " FROM known_coins"
     61            " JOIN denominations USING (denominations_serial)"
     62            " WHERE coin_pub=$1"
     63            " FOR SHARE;");
     64 
     65   return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     66                                                    "get_coin_denomination",
     67                                                    params,
     68                                                    rs);
     69 }