Line data    Source code

       1              : /*
       2              :    This file is part of TALER
       3              :    Copyright (C) 2022 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_templates.c
      18              :  * @brief Implementation of the iterate_templates function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "platform.h"
      22              : #include <taler/taler_pq_lib.h>
      23              : #include "merchant-database/iterate_templates.h"
      24              : #include "helper.h"
      25              : 
      26              : 
      27              : /**
      28              :  * Context used for TALER_MERCHANTDB_iterate_templates().
      29              :  */
      30              : struct LookupTemplateContext
      31              : {
      32              :   /**
      33              :    * Function to call with the results.
      34              :    */
      35              :   TALER_MERCHANTDB_TemplatesCallback 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 template.
      52              :  *
      53              :  * @param[in,out] cls of type `struct LookupTemplateContext *`
      54              :  * @param result the postgres result
      55              :  * @param num_results the number of results in @a result
      56              :  */
      57              : static void
      58            6 : lookup_templates_cb (void *cls,
      59              :                      PGresult *result,
      60              :                      unsigned int num_results)
      61              : {
      62            6 :   struct LookupTemplateContext *tlc = cls;
      63              : 
      64           11 :   for (unsigned int i = 0; i < num_results; i++)
      65              :   {
      66              :     char *template_id;
      67              :     char *template_description;
      68            5 :     struct GNUNET_PQ_ResultSpec rs[] = {
      69            5 :       GNUNET_PQ_result_spec_string ("template_id",
      70              :                                     &template_id),
      71            5 :       GNUNET_PQ_result_spec_string ("template_description",
      72              :                                     &template_description),
      73              :       GNUNET_PQ_result_spec_end
      74              :     };
      75              : 
      76            5 :     if (GNUNET_OK !=
      77            5 :         GNUNET_PQ_extract_result (result,
      78              :                                   rs,
      79              :                                   i))
      80              :     {
      81            0 :       GNUNET_break (0);
      82            0 :       tlc->extract_failed = true;
      83            0 :       return;
      84              :     }
      85            5 :     tlc->cb (tlc->cb_cls,
      86              :              template_id,
      87              :              template_description);
      88            5 :     GNUNET_PQ_cleanup_result (rs);
      89              :   }
      90              : }
      91              : 
      92              : 
      93              : enum GNUNET_DB_QueryStatus
      94            6 : TALER_MERCHANTDB_iterate_templates (
      95              :   struct TALER_MERCHANTDB_PostgresContext *pg,
      96              :   const char *instance_id,
      97              :   TALER_MERCHANTDB_TemplatesCallback cb,
      98              :   void *cb_cls)
      99              : {
     100            6 :   struct LookupTemplateContext tlc = {
     101              :     .cb = cb,
     102              :     .cb_cls = cb_cls,
     103              :     /* Can be overwritten by the lookup_template_cb */
     104              :     .extract_failed = false,
     105              :   };
     106            6 :   struct GNUNET_PQ_QueryParam params[] = {
     107              :     GNUNET_PQ_query_param_end
     108              :   };
     109              :   enum GNUNET_DB_QueryStatus qs;
     110              : 
     111            6 :   GNUNET_assert (NULL != pg->current_merchant_id);
     112            6 :   GNUNET_assert (0 == strcmp (instance_id,
     113              :                               pg->current_merchant_id));
     114            6 :   TMH_PQ_prepare_anon (pg,
     115              :                        "SELECT"
     116              :                        " template_id"
     117              :                        ",template_description"
     118              :                        " FROM merchant_template");
     119            6 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     120              :                                              "",
     121              :                                              params,
     122              :                                              &lookup_templates_cb,
     123              :                                              &tlc);
     124              :   /* If there was an error inside lookup_templates_cb, return a hard error. */
     125            6 :   if (tlc.extract_failed)
     126            0 :     return GNUNET_DB_STATUS_HARD_ERROR;
     127            6 :   return qs;
     128              : }