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Base system with REST service to issue digital coins, run by the payment service provider
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pg_iterate_active_auditors.c (3508B)

      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 exchangedb/pg_iterate_active_auditors.c
     18  * @brief Implementation of the iterate_active_auditors function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/platform.h"
     22 #include "taler/taler_error_codes.h"
     23 #include "taler/taler_dbevents.h"
     24 #include "taler/taler_pq_lib.h"
     25 #include "pg_iterate_active_auditors.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Closure for #auditors_cb_helper()
     31  */
     32 struct AuditorsIteratorContext
     33 {
     34   /**
     35    * Function to call with the results.
     36    */
     37   TALER_EXCHANGEDB_AuditorsCallback cb;
     38 
     39   /**
     40    * Closure to pass to @e cb
     41    */
     42   void *cb_cls;
     43 
     44 };
     45 
     46 
     47 /**
     48  * Helper function for #TEH_PG_iterate_active_auditors().
     49  * Calls the callback with each auditor.
     50  *
     51  * @param cls a `struct SignkeysIteratorContext`
     52  * @param result db results
     53  * @param num_results number of results in @a result
     54  */
     55 static void
     56 auditors_cb_helper (void *cls,
     57                     PGresult *result,
     58                     unsigned int num_results)
     59 {
     60   struct AuditorsIteratorContext *dic = cls;
     61 
     62   for (unsigned int i = 0; i<num_results; i++)
     63   {
     64     struct TALER_AuditorPublicKeyP auditor_pub;
     65     char *auditor_url;
     66     char *auditor_name;
     67     struct GNUNET_PQ_ResultSpec rs[] = {
     68       GNUNET_PQ_result_spec_auto_from_type ("auditor_pub",
     69                                             &auditor_pub),
     70       GNUNET_PQ_result_spec_string ("auditor_url",
     71                                     &auditor_url),
     72       GNUNET_PQ_result_spec_string ("auditor_name",
     73                                     &auditor_name),
     74       GNUNET_PQ_result_spec_end
     75     };
     76 
     77     if (GNUNET_OK !=
     78         GNUNET_PQ_extract_result (result,
     79                                   rs,
     80                                   i))
     81     {
     82       GNUNET_break (0);
     83       return;
     84     }
     85     dic->cb (dic->cb_cls,
     86              &auditor_pub,
     87              auditor_url,
     88              auditor_name);
     89     GNUNET_PQ_cleanup_result (rs);
     90   }
     91 }
     92 
     93 
     94 enum GNUNET_DB_QueryStatus
     95 TEH_PG_iterate_active_auditors (void *cls,
     96                                 TALER_EXCHANGEDB_AuditorsCallback cb,
     97                                 void *cb_cls)
     98 {
     99   struct PostgresClosure *pg = cls;
    100   struct GNUNET_PQ_QueryParam params[] = {
    101     GNUNET_PQ_query_param_end
    102   };
    103   struct AuditorsIteratorContext dic = {
    104     .cb = cb,
    105     .cb_cls = cb_cls,
    106   };
    107 
    108   PREPARE (pg,
    109            "select_auditors",
    110            "SELECT"
    111            " auditor_pub"
    112            ",auditor_url"
    113            ",auditor_name"
    114            " FROM auditors"
    115            " WHERE"
    116            "   is_active;");
    117 
    118   return GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    119                                                "select_auditors",
    120                                                params,
    121                                                &auditors_cb_helper,
    122                                                &dic);
    123 }