merchant

Merchant backend to process payments, run by merchants
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select_exchange_keys.c (2412B)

      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 src/backenddb/select_exchange_keys.c
     18  * @brief Implementation of the select_exchange_keys function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include <taler/taler_exchange_service.h>
     24 #include "merchant-database/select_exchange_keys.h"
     25 #include "helper.h"
     26 
     27 
     28 enum GNUNET_DB_QueryStatus
     29 TALER_MERCHANTDB_select_exchange_keys (
     30   struct TALER_MERCHANTDB_PostgresContext *pg,
     31   const char *exchange_url,
     32   struct GNUNET_TIME_Absolute *first_retry,
     33   struct TALER_EXCHANGE_Keys **keys)
     34 {
     35   struct GNUNET_PQ_QueryParam params[] = {
     36     GNUNET_PQ_query_param_string (exchange_url),
     37     GNUNET_PQ_query_param_end
     38   };
     39   json_t *jkeys = NULL;
     40   struct GNUNET_PQ_ResultSpec rs[] = {
     41     GNUNET_PQ_result_spec_absolute_time ("first_retry",
     42                                          first_retry),
     43     GNUNET_PQ_result_spec_allow_null (
     44       TALER_PQ_result_spec_json ("keys_json",
     45                                  &jkeys),
     46       NULL),
     47     GNUNET_PQ_result_spec_end
     48   };
     49   enum GNUNET_DB_QueryStatus qs;
     50 
     51   *keys = NULL;
     52   check_connection (pg);
     53   PREPARE (pg,
     54            "select_exchange_keys",
     55            "SELECT"
     56            " first_retry"
     57            ",keys_json::TEXT"
     58            " FROM merchant.merchant_exchange_keys"
     59            " WHERE exchange_url=$1;");
     60   qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     61                                                  "select_exchange_keys",
     62                                                  params,
     63                                                  rs);
     64   if (qs <= 0)
     65     return qs;
     66   if (NULL != jkeys)
     67   {
     68     *keys = TALER_EXCHANGE_keys_from_json (jkeys);
     69     json_decref (jkeys);
     70   }
     71   return qs;
     72 }