merchant

Merchant backend to process payments, run by merchants
Log | Files | Refs | Submodules | README | LICENSE

lookup_categories_by_ids.c (4701B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2025 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_categories_by_ids.c
     18  * @brief Lookup product categories by ID
     19  * @author Bohdan Potuzhnyi
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include "merchant-database/lookup_categories_by_ids.h"
     24 #include "helper.h"
     25 
     26 
     27 /**
     28  * Context used for TALER_MERCHANTDB_lookup_categories_by_ids().
     29  */
     30 struct LookupCategoryContext
     31 {
     32   /**
     33    * Function to call with the results.
     34    */
     35   TALER_MERCHANTDB_CategoriesCallback cb;
     36 
     37   /**
     38    * Closure for @a cb.
     39    */
     40   void *cb_cls;
     41 
     42   /**
     43    * Did database result extraction fail?
     44    */
     45   bool extract_failed;
     46 };
     47 
     48 
     49 static void
     50 lookup_categories_cb (void *cls,
     51                       PGresult *result,
     52                       unsigned int num_results)
     53 {
     54   struct LookupCategoryContext *tlc = cls;
     55 
     56   for (unsigned int i = 0; i < num_results; i++)
     57   {
     58     uint64_t category_id;
     59     char *category_name;
     60     json_t *category_name_i18n;
     61     uint64_t product_count;
     62     struct GNUNET_PQ_ResultSpec rs[] = {
     63       GNUNET_PQ_result_spec_uint64 ("category_serial",
     64                                     &category_id),
     65       GNUNET_PQ_result_spec_string ("category_name",
     66                                     &category_name),
     67       TALER_PQ_result_spec_json ("category_name_i18n",
     68                                  &category_name_i18n),
     69       GNUNET_PQ_result_spec_uint64 ("product_count",
     70                                     &product_count),
     71       GNUNET_PQ_result_spec_end
     72     };
     73 
     74     if (GNUNET_OK !=
     75         GNUNET_PQ_extract_result (result,
     76                                   rs,
     77                                   i))
     78     {
     79       GNUNET_break (0);
     80       tlc->extract_failed = true;
     81       return;
     82     }
     83     tlc->cb (tlc->cb_cls,
     84              category_id,
     85              category_name,
     86              category_name_i18n,
     87              product_count);
     88     GNUNET_PQ_cleanup_result (rs);
     89   }
     90 }
     91 
     92 
     93 enum GNUNET_DB_QueryStatus
     94 TALER_MERCHANTDB_lookup_categories_by_ids (struct TALER_MERCHANTDB_PostgresContext *pg,
     95                                            const char *instance_id,
     96                                            const uint64_t *category_ids,
     97                                            size_t num_category_ids,
     98                                            TALER_MERCHANTDB_CategoriesCallback cb,
     99                                            void *cb_cls)
    100 {
    101   struct LookupCategoryContext tlc = {
    102     .cb = cb,
    103     .cb_cls = cb_cls,
    104     /* Can be overwritten by the lookup_categories_cb */
    105     .extract_failed = false,
    106   };
    107   struct GNUNET_PQ_QueryParam params[] = {
    108     GNUNET_PQ_query_param_array_uint64 (num_category_ids,
    109                                         category_ids,
    110                                         pg->conn),
    111     GNUNET_PQ_query_param_end
    112   };
    113   enum GNUNET_DB_QueryStatus qs;
    114 
    115   GNUNET_assert (NULL != pg->current_merchant_id);
    116   GNUNET_assert (0 == strcmp (instance_id,
    117                               pg->current_merchant_id));
    118   check_connection (pg);
    119   TMH_PQ_prepare_anon (pg,
    120                        "SELECT"
    121                        " mc.category_serial"
    122                        ",mc.category_name"
    123                        ",mc.category_name_i18n::TEXT"
    124                        ",COALESCE(COUNT(mpc.product_serial),0)"
    125                        "   AS product_count"
    126                        " FROM merchant_categories mc"
    127                        " LEFT JOIN merchant_product_categories mpc"
    128                        "   USING (category_serial)"
    129                        " WHERE mc.category_serial = ANY ($1)"
    130                        " GROUP BY mc.category_serial"
    131                        " ORDER BY mc.category_serial;");
    132   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    133                                              "",
    134                                              params,
    135                                              &lookup_categories_cb,
    136                                              &tlc);
    137   GNUNET_PQ_cleanup_query_params_closures (params);
    138   if (tlc.extract_failed)
    139     return GNUNET_DB_STATUS_HARD_ERROR;
    140   return qs;
    141 }