exchange

Base system with REST service to issue digital coins, run by the payment service provider
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iterate_active_auditors.c (3498B)

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