merchant

Merchant backend to process payments, run by merchants
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lookup_deposits.c (5114B)

      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 src/backenddb/lookup_deposits.c
     18  * @brief Implementation of the lookup_deposits function for Postgres
     19  * @author Iván Ávalos
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include "merchant-database/lookup_deposits.h"
     24 #include "helper.h"
     25 
     26 /**
     27  * Closure for #lookup_deposits_cb().
     28  */
     29 struct LookupDepositsContext
     30 {
     31   /**
     32    * Function to call with results.
     33    */
     34   TALER_MERCHANTDB_DepositsCallback cb;
     35 
     36   /**
     37    * Closure for @e cls.
     38    */
     39   void *cb_cls;
     40 
     41   /**
     42    * Plugin context.
     43    */
     44   struct TALER_MERCHANTDB_PostgresContext *pg;
     45 
     46   /**
     47    * Transaction status (set).
     48    */
     49   enum GNUNET_DB_QueryStatus qs;
     50 };
     51 
     52 
     53 /**
     54  * Function to be called with the results of a SELECT statement
     55  * that has returned @a num_results results.
     56  *
     57  * @param[in,out] cls of type `struct LookupDepositsContext *`
     58  * @param result the postgres result
     59  * @param num_results the number of results in @a result
     60  */
     61 static void
     62 lookup_deposits_cb (void *cls,
     63                     PGresult *result,
     64                     unsigned int num_results)
     65 {
     66   struct LookupDepositsContext *ldc = cls;
     67 
     68   for (unsigned int i = 0; i<num_results; i++)
     69   {
     70     struct TALER_CoinSpendPublicKeyP coin_pub;
     71     struct TALER_Amount amount_with_fee;
     72     struct TALER_Amount deposit_fee;
     73     struct TALER_Amount refund_fee;
     74     char *exchange_url;
     75     struct GNUNET_PQ_ResultSpec rs[] = {
     76       GNUNET_PQ_result_spec_string ("exchange_url",
     77                                     &exchange_url),
     78       GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
     79                                             &coin_pub),
     80       TALER_PQ_result_spec_amount_with_currency ("amount_with_fee",
     81                                                  &amount_with_fee),
     82       TALER_PQ_result_spec_amount_with_currency ("deposit_fee",
     83                                                  &deposit_fee),
     84       TALER_PQ_result_spec_amount_with_currency ("refund_fee",
     85                                                  &refund_fee),
     86       GNUNET_PQ_result_spec_end
     87     };
     88 
     89     if (GNUNET_OK !=
     90         GNUNET_PQ_extract_result (result,
     91                                   rs,
     92                                   i))
     93     {
     94       GNUNET_break (0);
     95       ldc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     96       return;
     97     }
     98     ldc->cb (ldc->cb_cls,
     99              exchange_url,
    100              &coin_pub,
    101              &amount_with_fee,
    102              &deposit_fee,
    103              &refund_fee);
    104     GNUNET_PQ_cleanup_result (rs);
    105   }
    106   ldc->qs = num_results;
    107 }
    108 
    109 
    110 enum GNUNET_DB_QueryStatus
    111 TALER_MERCHANTDB_lookup_deposits (
    112   struct TALER_MERCHANTDB_PostgresContext *pg,
    113   const char *instance_id,
    114   const struct TALER_PrivateContractHashP *h_contract_terms,
    115   TALER_MERCHANTDB_DepositsCallback cb,
    116   void *cb_cls)
    117 {
    118   struct GNUNET_PQ_QueryParam params[] = {
    119     GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
    120     GNUNET_PQ_query_param_end
    121   };
    122   struct LookupDepositsContext ldc = {
    123     .cb = cb,
    124     .cb_cls = cb_cls,
    125     .pg = pg
    126   };
    127   enum GNUNET_DB_QueryStatus qs;
    128 
    129   GNUNET_assert (NULL != pg->current_merchant_id);
    130   GNUNET_assert (0 == strcmp (instance_id,
    131                               pg->current_merchant_id));
    132   /* no preflight check here, run in its own transaction by the caller! */
    133   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
    134               "Finding deposits for h_contract_terms '%s'\n",
    135               GNUNET_h2s (&h_contract_terms->hash));
    136   check_connection (pg);
    137   TMH_PQ_prepare_anon (pg,
    138                        "SELECT"
    139                        " dcom.exchange_url"
    140                        ",dep.coin_pub"
    141                        ",dep.amount_with_fee"
    142                        ",dep.deposit_fee"
    143                        ",dep.refund_fee"
    144                        " FROM merchant_deposits dep"
    145                        " JOIN merchant_deposit_confirmations dcom"
    146                        "   USING (deposit_confirmation_serial)"
    147                        " WHERE dcom.order_serial="
    148                        "     (SELECT order_serial"
    149                        "        FROM merchant_contract_terms"
    150                        "        WHERE h_contract_terms=$1)");
    151   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    152                                              "",
    153                                              params,
    154                                              &lookup_deposits_cb,
    155                                              &ldc);
    156   if (qs <= 0)
    157     return qs;
    158   return ldc.qs;
    159 }