Line data    Source code

       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/iterate_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/iterate_categories_by_ids.h"
      24              : #include "helper.h"
      25              : 
      26              : 
      27              : /**
      28              :  * Context used for TALER_MERCHANTDB_iterate_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            2 : lookup_categories_cb (void *cls,
      51              :                       PGresult *result,
      52              :                       unsigned int num_results)
      53              : {
      54            2 :   struct LookupCategoryContext *tlc = cls;
      55              : 
      56            6 :   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            4 :     struct GNUNET_PQ_ResultSpec rs[] = {
      63            4 :       GNUNET_PQ_result_spec_uint64 ("category_serial",
      64              :                                     &category_id),
      65            4 :       GNUNET_PQ_result_spec_string ("category_name",
      66              :                                     &category_name),
      67            4 :       TALER_PQ_result_spec_json ("category_name_i18n",
      68              :                                  &category_name_i18n),
      69            4 :       GNUNET_PQ_result_spec_uint64 ("product_count",
      70              :                                     &product_count),
      71              :       GNUNET_PQ_result_spec_end
      72              :     };
      73              : 
      74            4 :     if (GNUNET_OK !=
      75            4 :         GNUNET_PQ_extract_result (result,
      76              :                                   rs,
      77              :                                   i))
      78              :     {
      79            0 :       GNUNET_break (0);
      80            0 :       tlc->extract_failed = true;
      81            0 :       return;
      82              :     }
      83            4 :     tlc->cb (tlc->cb_cls,
      84              :              category_id,
      85              :              category_name,
      86              :              category_name_i18n,
      87              :              product_count);
      88            4 :     GNUNET_PQ_cleanup_result (rs);
      89              :   }
      90              : }
      91              : 
      92              : 
      93              : enum GNUNET_DB_QueryStatus
      94            2 : TALER_MERCHANTDB_iterate_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            2 :   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            2 :   struct GNUNET_PQ_QueryParam params[] = {
     108            2 :     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            2 :   GNUNET_assert (NULL != pg->current_merchant_id);
     116            2 :   GNUNET_assert (0 == strcmp (instance_id,
     117              :                               pg->current_merchant_id));
     118            2 :   TMH_PQ_prepare_anon (pg,
     119              :                        "SELECT"
     120              :                        " mc.category_serial"
     121              :                        ",mc.category_name"
     122              :                        ",mc.category_name_i18n::TEXT"
     123              :                        ",COALESCE(COUNT(mpc.product_serial),0)"
     124              :                        "   AS product_count"
     125              :                        " FROM merchant_categories mc"
     126              :                        " LEFT JOIN merchant_product_categories mpc"
     127              :                        "   USING (category_serial)"
     128              :                        " WHERE mc.category_serial = ANY ($1)"
     129              :                        " GROUP BY mc.category_serial"
     130              :                        " ORDER BY mc.category_serial;");
     131            2 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     132              :                                              "",
     133              :                                              params,
     134              :                                              &lookup_categories_cb,
     135              :                                              &tlc);
     136            2 :   GNUNET_PQ_cleanup_query_params_closures (params);
     137            2 :   if (tlc.extract_failed)
     138            0 :     return GNUNET_DB_STATUS_HARD_ERROR;
     139            2 :   return qs;
     140              : }