merchant

Merchant backend to process payments, run by merchants
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lookup_categories_by_ids.c (4695B)

      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_error_codes.h>
     23 #include <taler/taler_dbevents.h>
     24 #include <taler/taler_pq_lib.h>
     25 #include "merchant-database/lookup_categories_by_ids.h"
     26 #include "helper.h"
     27 
     28 
     29 /**
     30  * Context used for TALER_MERCHANTDB_lookup_categories_by_ids().
     31  */
     32 struct LookupCategoryContext
     33 {
     34   /**
     35    * Function to call with the results.
     36    */
     37   TALER_MERCHANTDB_CategoriesCallback cb;
     38 
     39   /**
     40    * Closure for @a cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Did database result extraction fail?
     46    */
     47   bool extract_failed;
     48 };
     49 
     50 
     51 static void
     52 lookup_categories_cb (void *cls,
     53                       PGresult *result,
     54                       unsigned int num_results)
     55 {
     56   struct LookupCategoryContext *tlc = cls;
     57 
     58   for (unsigned int i = 0; i < num_results; i++)
     59   {
     60     uint64_t category_id;
     61     char *category_name;
     62     json_t *category_name_i18n;
     63     uint64_t product_count;
     64     struct GNUNET_PQ_ResultSpec rs[] = {
     65       GNUNET_PQ_result_spec_uint64 ("category_serial",
     66                                     &category_id),
     67       GNUNET_PQ_result_spec_string ("category_name",
     68                                     &category_name),
     69       TALER_PQ_result_spec_json ("category_name_i18n",
     70                                  &category_name_i18n),
     71       GNUNET_PQ_result_spec_uint64 ("product_count",
     72                                     &product_count),
     73       GNUNET_PQ_result_spec_end
     74     };
     75 
     76     if (GNUNET_OK !=
     77         GNUNET_PQ_extract_result (result,
     78                                   rs,
     79                                   i))
     80     {
     81       GNUNET_break (0);
     82       tlc->extract_failed = true;
     83       return;
     84     }
     85     tlc->cb (tlc->cb_cls,
     86              category_id,
     87              category_name,
     88              category_name_i18n,
     89              product_count);
     90     GNUNET_PQ_cleanup_result (rs);
     91   }
     92 }
     93 
     94 
     95 enum GNUNET_DB_QueryStatus
     96 TALER_MERCHANTDB_lookup_categories_by_ids (struct TALER_MERCHANTDB_PostgresContext *pg,
     97                                            const char *instance_id,
     98                                            const uint64_t *category_ids,
     99                                            size_t num_category_ids,
    100                                            TALER_MERCHANTDB_CategoriesCallback cb,
    101                                            void *cb_cls)
    102 {
    103   struct LookupCategoryContext tlc = {
    104     .cb = cb,
    105     .cb_cls = cb_cls,
    106     /* Can be overwritten by the lookup_categories_cb */
    107     .extract_failed = false,
    108   };
    109   struct GNUNET_PQ_QueryParam params[] = {
    110     GNUNET_PQ_query_param_string (instance_id),
    111     GNUNET_PQ_query_param_array_uint64 (num_category_ids,
    112                                         category_ids,
    113                                         pg->conn),
    114     GNUNET_PQ_query_param_end
    115   };
    116   enum GNUNET_DB_QueryStatus qs;
    117 
    118   check_connection (pg);
    119   PREPARE (pg,
    120            "lookup_categories_by_ids",
    121            "SELECT"
    122            " mc.category_serial"
    123            ",mc.category_name"
    124            ",mc.category_name_i18n::TEXT"
    125            ",COALESCE(COUNT(mpc.product_serial),0)"
    126            "   AS product_count"
    127            " FROM merchant_categories mc"
    128            " LEFT JOIN merchant_product_categories mpc"
    129            "   USING (category_serial)"
    130            " JOIN merchant_instances mi"
    131            "   USING (merchant_serial)"
    132            " WHERE mi.merchant_id=$1"
    133            "   AND mc.category_serial = ANY ($2)"
    134            " GROUP BY mc.category_serial"
    135            " ORDER BY mc.category_serial;");
    136   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    137                                              "lookup_categories_by_ids",
    138                                              params,
    139                                              &lookup_categories_cb,
    140                                              &tlc);
    141   GNUNET_PQ_cleanup_query_params_closures (params);
    142   if (tlc.extract_failed)
    143     return GNUNET_DB_STATUS_HARD_ERROR;
    144   return qs;
    145 }