merchant

Merchant backend to process payments, run by merchants
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lookup_token_families.c (4911B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2023 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/lookup_token_families.c
     18  * @brief Implementation of the lookup_token_families function for Postgres
     19  * @author Christian Blättler
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include "merchant-database/lookup_token_families.h"
     24 #include "helper.h"
     25 #include "merchantdb_lib.h"
     26 
     27 
     28 /**
     29  * Context used for TALER_MERCHANTDB_lookup_token_families().
     30  */
     31 struct LookupTokenFamiliesContext
     32 {
     33   /**
     34    * Function to call with the results.
     35    */
     36   TALER_MERCHANTDB_TokenFamiliesCallback cb;
     37 
     38   /**
     39    * Closure for @a cb.
     40    */
     41   void *cb_cls;
     42 
     43   /**
     44    * Did database result extraction fail?
     45    */
     46   bool extract_failed;
     47 };
     48 
     49 
     50 /**
     51  * Function to be called with the results of a SELECT statement
     52  * that has returned @a num_results results about token families.
     53  *
     54  * @param[in,out] cls of type `struct LookupTokenFamiliesContext *`
     55  * @param result the postgres result
     56  * @param num_results the number of results in @a result
     57  */
     58 static void
     59 lookup_token_families_cb (void *cls,
     60                           PGresult *result,
     61                           unsigned int num_results)
     62 {
     63   struct LookupTokenFamiliesContext *tflc = cls;
     64 
     65   for (unsigned int i = 0; i < num_results; i++)
     66   {
     67     char *slug;
     68     char *name;
     69     char *description;
     70     json_t *description_i18n = NULL;
     71     char *kind;
     72     struct GNUNET_TIME_Timestamp valid_after;
     73     struct GNUNET_TIME_Timestamp valid_before;
     74     struct GNUNET_PQ_ResultSpec rs[] = {
     75       GNUNET_PQ_result_spec_string ("slug",
     76                                     &slug),
     77       GNUNET_PQ_result_spec_string ("name",
     78                                     &name),
     79       GNUNET_PQ_result_spec_string ("description",
     80                                     &description),
     81       GNUNET_PQ_result_spec_allow_null (
     82         TALER_PQ_result_spec_json ("description_i18n",
     83                                    &description_i18n),
     84         NULL),
     85       GNUNET_PQ_result_spec_timestamp ("valid_after",
     86                                        &valid_after),
     87       GNUNET_PQ_result_spec_timestamp ("valid_before",
     88                                        &valid_before),
     89       GNUNET_PQ_result_spec_string ("kind",
     90                                     &kind),
     91       GNUNET_PQ_result_spec_end
     92     };
     93 
     94     if (GNUNET_OK !=
     95         GNUNET_PQ_extract_result (result,
     96                                   rs,
     97                                   i))
     98     {
     99       GNUNET_break (0);
    100       tflc->extract_failed = true;
    101       return;
    102     }
    103 
    104     tflc->cb (tflc->cb_cls,
    105               slug,
    106               name,
    107               description,
    108               description_i18n,
    109               valid_after,
    110               valid_before,
    111               kind);
    112     GNUNET_PQ_cleanup_result (rs);
    113   }
    114 }
    115 
    116 
    117 enum GNUNET_DB_QueryStatus
    118 TALER_MERCHANTDB_lookup_token_families (
    119   struct TALER_MERCHANTDB_PostgresContext *pg,
    120   const char *instance_id,
    121   TALER_MERCHANTDB_TokenFamiliesCallback cb,
    122   void *cb_cls)
    123 {
    124   struct LookupTokenFamiliesContext context = {
    125     .cb = cb,
    126     .cb_cls = cb_cls,
    127     /* Can be overwritten by the lookup_token_families_cb */
    128     .extract_failed = false,
    129   };
    130   struct GNUNET_PQ_QueryParam params[] = {
    131     GNUNET_PQ_query_param_end
    132   };
    133   enum GNUNET_DB_QueryStatus qs;
    134 
    135   GNUNET_assert (NULL != pg->current_merchant_id);
    136   GNUNET_assert (0 == strcmp (instance_id,
    137                               pg->current_merchant_id));
    138   check_connection (pg);
    139   TMH_PQ_prepare_anon (pg,
    140                        "SELECT"
    141                        " slug"
    142                        ",name"
    143                        ",description"
    144                        ",description_i18n::TEXT"
    145                        ",valid_after"
    146                        ",valid_before"
    147                        ",kind"
    148                        " FROM merchant_token_families");
    149   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    150                                              "",
    151                                              params,
    152                                              &lookup_token_families_cb,
    153                                              &context);
    154   /* If there was an error inside lookup_token_families_cb, return a hard error. */
    155   if (context.extract_failed)
    156     return GNUNET_DB_STATUS_HARD_ERROR;
    157   return qs;
    158 }