exchange

Base system with REST service to issue digital coins, run by the payment service provider
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pg_select_deposit_amounts_for_kyc_check.c (4245B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2024 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_select_deposit_amounts_for_kyc_check.c
     18  * @brief Implementation of the select_deposit_amounts_for_kyc_check function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "taler/exchange-database/select_deposit_amounts_for_kyc_check.h"
     23 #include "helper.h"
     24 
     25 /**
     26  * Closure for #get_kyc_amounts_cb().
     27  */
     28 struct KycAmountCheckContext
     29 {
     30   /**
     31    * Function to call per result.
     32    */
     33   TALER_KYCLOGIC_KycAmountCallback cb;
     34 
     35   /**
     36    * Closure for @e cb.
     37    */
     38   void *cb_cls;
     39 
     40   /**
     41    * Plugin context.
     42    */
     43   struct TALER_EXCHANGEDB_PostgresContext *pg;
     44 
     45   /**
     46    * Flag set to #GNUNET_OK as long as everything is fine.
     47    */
     48   enum GNUNET_GenericReturnValue status;
     49 
     50 };
     51 
     52 /**
     53  * Invoke the callback for each result.
     54  *
     55  * @param cls a `struct KycAmountCheckContext *`
     56  * @param result SQL result
     57  * @param num_results number of rows in @a result
     58  */
     59 static void
     60 get_kyc_amounts_cb (void *cls,
     61                     PGresult *result,
     62                     unsigned int num_results)
     63 {
     64   struct KycAmountCheckContext *ctx = cls;
     65   struct TALER_EXCHANGEDB_PostgresContext *pg = ctx->pg;
     66 
     67   for (unsigned int i = 0; i < num_results; i++)
     68   {
     69     struct GNUNET_TIME_Absolute date;
     70     struct TALER_Amount amount;
     71     struct GNUNET_PQ_ResultSpec rs[] = {
     72       TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
     73                                    &amount),
     74       GNUNET_PQ_result_spec_absolute_time ("date",
     75                                            &date),
     76       GNUNET_PQ_result_spec_end
     77     };
     78     enum GNUNET_GenericReturnValue ret;
     79 
     80     if (GNUNET_OK !=
     81         GNUNET_PQ_extract_result (result,
     82                                   rs,
     83                                   i))
     84     {
     85       GNUNET_break (0);
     86       ctx->status = GNUNET_SYSERR;
     87       return;
     88     }
     89     ret = ctx->cb (ctx->cb_cls,
     90                    &amount,
     91                    date);
     92     GNUNET_PQ_cleanup_result (rs);
     93     switch (ret)
     94     {
     95     case GNUNET_OK:
     96       continue;
     97     case GNUNET_NO:
     98       break;
     99     case GNUNET_SYSERR:
    100       ctx->status = GNUNET_SYSERR;
    101       break;
    102     }
    103     break;
    104   }
    105 }
    106 
    107 
    108 enum GNUNET_DB_QueryStatus
    109 TALER_EXCHANGEDB_select_deposit_amounts_for_kyc_check (
    110   struct TALER_EXCHANGEDB_PostgresContext *pg,
    111   const struct TALER_NormalizedPaytoHashP *h_payto,
    112   struct GNUNET_TIME_Absolute time_limit,
    113   TALER_KYCLOGIC_KycAmountCallback kac,
    114   void *kac_cls)
    115 {
    116   struct GNUNET_PQ_QueryParam params[] = {
    117     GNUNET_PQ_query_param_auto_from_type (h_payto),
    118     GNUNET_PQ_query_param_absolute_time (&time_limit),
    119     GNUNET_PQ_query_param_end
    120   };
    121   struct KycAmountCheckContext ctx = {
    122     .cb = kac,
    123     .cb_cls = kac_cls,
    124     .pg = pg,
    125     .status = GNUNET_OK
    126   };
    127   enum GNUNET_DB_QueryStatus qs;
    128 
    129   PREPARE (pg,
    130            "select_kyc_relevant_deposit_events",
    131            "SELECT"
    132            " cd.amount_with_fee AS amount"
    133            ",bd.exchange_timestamp AS date"
    134            " FROM batch_deposits bd"
    135            " JOIN coin_deposits cd"
    136            "   USING (batch_deposit_serial_id)"
    137            " WHERE wire_target_h_payto IN ("
    138            "   SELECT wire_target_h_payto"
    139            "     FROM wire_targets"
    140            "    WHERE h_normalized_payto=$1"
    141            "   )"
    142            "   AND bd.exchange_timestamp >= $2"
    143            " ORDER BY bd.exchange_timestamp DESC");
    144   qs = GNUNET_PQ_eval_prepared_multi_select (
    145     pg->conn,
    146     "select_kyc_relevant_deposit_events",
    147     params,
    148     &get_kyc_amounts_cb,
    149     &ctx);
    150   if (GNUNET_OK != ctx.status)
    151     return GNUNET_DB_STATUS_HARD_ERROR;
    152   return qs;
    153 }