Line data    Source code

       1              : /*
       2              :    This file is part of TALER
       3              :    Copyright (C) 2024 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.c
      18              :  * @brief Implementation of the iterate_categories function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "platform.h"
      22              : #include <taler/taler_pq_lib.h>
      23              : #include "merchant-database/iterate_categories.h"
      24              : #include "helper.h"
      25              : 
      26              : 
      27              : /**
      28              :  * Context used for TALER_MERCHANTDB_iterate_categories().
      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              : /**
      50              :  * Function to be called with the results of a SELECT statement
      51              :  * that has returned @a num_results results about otp_device.
      52              :  *
      53              :  * @param[in,out] cls of type `struct LookupCategoryContext *`
      54              :  * @param result the postgres result
      55              :  * @param num_results the number of results in @a result
      56              :  */
      57              : static void
      58            0 : lookup_categories_cb (void *cls,
      59              :                       PGresult *result,
      60              :                       unsigned int num_results)
      61              : {
      62            0 :   struct LookupCategoryContext *tlc = cls;
      63              : 
      64            0 :   for (unsigned int i = 0; i < num_results; i++)
      65              :   {
      66              :     uint64_t category_id;
      67              :     char *category_name;
      68              :     json_t *category_name_i18n;
      69              :     uint64_t product_count;
      70            0 :     struct GNUNET_PQ_ResultSpec rs[] = {
      71            0 :       GNUNET_PQ_result_spec_uint64 ("category_serial",
      72              :                                     &category_id),
      73            0 :       GNUNET_PQ_result_spec_string ("category_name",
      74              :                                     &category_name),
      75            0 :       TALER_PQ_result_spec_json ("category_name_i18n",
      76              :                                  &category_name_i18n),
      77            0 :       GNUNET_PQ_result_spec_uint64 ("product_count",
      78              :                                     &product_count),
      79              :       GNUNET_PQ_result_spec_end
      80              :     };
      81              : 
      82            0 :     if (GNUNET_OK !=
      83            0 :         GNUNET_PQ_extract_result (result,
      84              :                                   rs,
      85              :                                   i))
      86              :     {
      87            0 :       GNUNET_break (0);
      88            0 :       tlc->extract_failed = true;
      89            0 :       return;
      90              :     }
      91            0 :     tlc->cb (tlc->cb_cls,
      92              :              category_id,
      93              :              category_name,
      94              :              category_name_i18n,
      95              :              product_count);
      96            0 :     GNUNET_PQ_cleanup_result (rs);
      97              :   }
      98              : }
      99              : 
     100              : 
     101              : enum GNUNET_DB_QueryStatus
     102            0 : TALER_MERCHANTDB_iterate_categories (
     103              :   struct TALER_MERCHANTDB_PostgresContext *pg,
     104              :   const char *instance_id,
     105              :   TALER_MERCHANTDB_CategoriesCallback cb,
     106              :   void *cb_cls)
     107              : {
     108            0 :   struct LookupCategoryContext tlc = {
     109              :     .cb = cb,
     110              :     .cb_cls = cb_cls,
     111              :     /* Can be overwritten by the lookup_categories_cb */
     112              :     .extract_failed = false,
     113              :   };
     114            0 :   struct GNUNET_PQ_QueryParam params[] = {
     115              :     GNUNET_PQ_query_param_end
     116              :   };
     117              :   enum GNUNET_DB_QueryStatus qs;
     118              : 
     119            0 :   GNUNET_assert (NULL != pg->current_merchant_id);
     120            0 :   GNUNET_assert (0 == strcmp (instance_id,
     121              :                               pg->current_merchant_id));
     122            0 :   TMH_PQ_prepare_anon (pg,
     123              :                        "SELECT"
     124              :                        " mc.category_serial"
     125              :                        ",mc.category_name"
     126              :                        ",mc.category_name_i18n::TEXT"
     127              :                        ",COALESCE(COUNT(mpc.product_serial),0)"
     128              :                        "   AS product_count"
     129              :                        " FROM merchant_categories mc"
     130              :                        " LEFT JOIN merchant_product_categories mpc"
     131              :                        "   USING (category_serial)"
     132              :                        " GROUP BY mc.category_serial"
     133              :                        " ORDER BY mc.category_serial;");
     134            0 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     135              :                                              "",
     136              :                                              params,
     137              :                                              &lookup_categories_cb,
     138              :                                              &tlc);
     139              :   /* If there was an error inside lookup_categories_cb, return a hard error. */
     140            0 :   if (tlc.extract_failed)
     141            0 :     return GNUNET_DB_STATUS_HARD_ERROR;
     142            0 :   return qs;
     143              : }