merchant

Merchant backend to process payments, run by merchants
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pg_select_exchange_keys.c (2545B)

      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 backenddb/pg_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_error_codes.h>
     23 #include <taler/taler_dbevents.h>
     24 #include <taler/taler_pq_lib.h>
     25 #include "pg_select_exchange_keys.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 enum GNUNET_DB_QueryStatus
     30 TMH_PG_select_exchange_keys (void *cls,
     31                              const char *exchange_url,
     32                              struct GNUNET_TIME_Absolute *first_retry,
     33                              struct TALER_EXCHANGE_Keys **keys)
     34 {
     35   struct PostgresClosure *pg = cls;
     36   struct GNUNET_PQ_QueryParam params[] = {
     37     GNUNET_PQ_query_param_string (exchange_url),
     38     GNUNET_PQ_query_param_end
     39   };
     40   json_t *jkeys;
     41   struct GNUNET_PQ_ResultSpec rs[] = {
     42     GNUNET_PQ_result_spec_absolute_time ("first_retry",
     43                                          first_retry),
     44     TALER_PQ_result_spec_json ("keys_json",
     45                                &jkeys),
     46     GNUNET_PQ_result_spec_end
     47   };
     48   enum GNUNET_DB_QueryStatus qs;
     49 
     50   check_connection (pg);
     51   PREPARE (pg,
     52            "select_exchange_keys",
     53            "SELECT"
     54            " first_retry"
     55            ",keys_json::TEXT"
     56            " FROM merchant_exchange_keys"
     57            " WHERE exchange_url=$1;");
     58   qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     59                                                  "select_exchange_keys",
     60                                                  params,
     61                                                  rs);
     62   if (qs <= 0)
     63     return qs;
     64   *keys = TALER_EXCHANGE_keys_from_json (jkeys);
     65   json_decref (jkeys);
     66   if (NULL == *keys)
     67   {
     68     /* malformed /keys in cache, maybe format change. Just ignore */
     69     GNUNET_break (0);
     70     return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
     71   }
     72   return qs;
     73 }