exchange

Base system with REST service to issue digital coins, run by the payment service provider
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pg_iterate_kyc_reference.c (3552B)

      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 pg_iterate_kyc_reference.c
     18  * @brief Low-level (statement-level) Postgres database access for the exchange
     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_kyc_reference.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Closure for #iterate_kyc_reference_cb()
     31  */
     32 struct IteratorContext
     33 {
     34   /**
     35    * Function to call with the results.
     36    */
     37   TALER_EXCHANGEDB_LegitimizationProcessCallback cb;
     38 
     39   /**
     40    * Closure to pass to @e cb
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Plugin context.
     46    */
     47   struct PostgresClosure *pg;
     48 };
     49 
     50 
     51 /**
     52  * Helper function for #TEH_PG_iterate_kyc_reference().
     53  * Calls the callback with each denomination key.
     54  *
     55  * @param cls a `struct IteratorContext`
     56  * @param result db results
     57  * @param num_results number of results in @a result
     58  */
     59 static void
     60 iterate_kyc_reference_cb (void *cls,
     61                           PGresult *result,
     62                           unsigned int num_results)
     63 {
     64   struct IteratorContext *ic = cls;
     65 
     66   for (unsigned int i = 0; i<num_results; i++)
     67   {
     68     char *kyc_provider_name_name;
     69     char *provider_user_id;
     70     char *legitimization_id;
     71     struct GNUNET_PQ_ResultSpec rs[] = {
     72       GNUNET_PQ_result_spec_string ("provider_name",
     73                                     &kyc_provider_name_name),
     74       GNUNET_PQ_result_spec_string ("provider_user_id",
     75                                     &provider_user_id),
     76       GNUNET_PQ_result_spec_string ("provider_legitimization_id",
     77                                     &legitimization_id),
     78       GNUNET_PQ_result_spec_end
     79     };
     80 
     81     if (GNUNET_OK !=
     82         GNUNET_PQ_extract_result (result,
     83                                   rs,
     84                                   i))
     85     {
     86       GNUNET_break (0);
     87       return;
     88     }
     89     ic->cb (ic->cb_cls,
     90             kyc_provider_name_name,
     91             provider_user_id,
     92             legitimization_id);
     93     GNUNET_PQ_cleanup_result (rs);
     94   }
     95 }
     96 
     97 
     98 enum GNUNET_DB_QueryStatus
     99 TEH_PG_iterate_kyc_reference (
    100   void *cls,
    101   const struct TALER_NormalizedPaytoHashP *h_payto,
    102   TALER_EXCHANGEDB_LegitimizationProcessCallback lpc,
    103   void *lpc_cls)
    104 {
    105   struct PostgresClosure *pg = cls;
    106   struct GNUNET_PQ_QueryParam params[] = {
    107     GNUNET_PQ_query_param_auto_from_type (h_payto),
    108     GNUNET_PQ_query_param_end
    109   };
    110   struct IteratorContext ic = {
    111     .cb = lpc,
    112     .cb_cls = lpc_cls,
    113     .pg = pg
    114   };
    115 
    116   PREPARE (pg,
    117            "iterate_kyc_reference",
    118            "SELECT "
    119            " provider_name"
    120            ",provider_user_id"
    121            ",provider_legitimization_id"
    122            " FROM legitimization_processes"
    123            " WHERE h_payto=$1;");
    124   return GNUNET_PQ_eval_prepared_multi_select (
    125     pg->conn,
    126     "iterate_kyc_reference",
    127     params,
    128     &iterate_kyc_reference_cb,
    129     &ic);
    130 }