exchange

Base system with REST service to issue digital coins, run by the payment service provider
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iterate_kyc_reference.c (3497B)

      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 iterate_kyc_reference.c
     18  * @brief Low-level (statement-level) Postgres database access for the exchange
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/iterate_kyc_reference.h"
     23 #include "helper.h"
     24 
     25 
     26 /**
     27  * Closure for #iterate_kyc_reference_cb()
     28  */
     29 struct IteratorContext
     30 {
     31   /**
     32    * Function to call with the results.
     33    */
     34   TALER_EXCHANGEDB_LegitimizationProcessCallback cb;
     35 
     36   /**
     37    * Closure to pass to @e cb
     38    */
     39   void *cb_cls;
     40 
     41   /**
     42    * Plugin context.
     43    */
     44   struct TALER_EXCHANGEDB_PostgresContext *pg;
     45 };
     46 
     47 
     48 /**
     49  * Helper function for #TALER_EXCHANGEDB_iterate_kyc_reference().
     50  * Calls the callback with each denomination key.
     51  *
     52  * @param cls a `struct IteratorContext`
     53  * @param result db results
     54  * @param num_results number of results in @a result
     55  */
     56 static void
     57 iterate_kyc_reference_cb (void *cls,
     58                           PGresult *result,
     59                           unsigned int num_results)
     60 {
     61   struct IteratorContext *ic = cls;
     62 
     63   for (unsigned int i = 0; i<num_results; i++)
     64   {
     65     char *kyc_provider_name_name;
     66     char *provider_user_id;
     67     char *legitimization_id;
     68     struct GNUNET_PQ_ResultSpec rs[] = {
     69       GNUNET_PQ_result_spec_string ("provider_name",
     70                                     &kyc_provider_name_name),
     71       GNUNET_PQ_result_spec_string ("provider_user_id",
     72                                     &provider_user_id),
     73       GNUNET_PQ_result_spec_string ("provider_legitimization_id",
     74                                     &legitimization_id),
     75       GNUNET_PQ_result_spec_end
     76     };
     77 
     78     if (GNUNET_OK !=
     79         GNUNET_PQ_extract_result (result,
     80                                   rs,
     81                                   i))
     82     {
     83       GNUNET_break (0);
     84       return;
     85     }
     86     ic->cb (ic->cb_cls,
     87             kyc_provider_name_name,
     88             provider_user_id,
     89             legitimization_id);
     90     GNUNET_PQ_cleanup_result (rs);
     91   }
     92 }
     93 
     94 
     95 enum GNUNET_DB_QueryStatus
     96 TALER_EXCHANGEDB_iterate_kyc_reference (
     97   struct TALER_EXCHANGEDB_PostgresContext *pg,
     98   const struct TALER_NormalizedPaytoHashP *h_payto,
     99   TALER_EXCHANGEDB_LegitimizationProcessCallback lpc,
    100   void *lpc_cls)
    101 {
    102   struct GNUNET_PQ_QueryParam params[] = {
    103     GNUNET_PQ_query_param_auto_from_type (h_payto),
    104     GNUNET_PQ_query_param_end
    105   };
    106   struct IteratorContext ic = {
    107     .cb = lpc,
    108     .cb_cls = lpc_cls,
    109     .pg = pg
    110   };
    111 
    112   PREPARE (pg,
    113            "iterate_kyc_reference",
    114            "SELECT "
    115            " provider_name"
    116            ",provider_user_id"
    117            ",provider_legitimization_id"
    118            " FROM legitimization_processes"
    119            " WHERE h_payto=$1;");
    120   return GNUNET_PQ_eval_prepared_multi_select (
    121     pg->conn,
    122     "iterate_kyc_reference",
    123     params,
    124     &iterate_kyc_reference_cb,
    125     &ic);
    126 }