merchant

Merchant backend to process payments, run by merchants
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pg_lookup_deposits.c (5109B)

      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 backenddb/pg_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_error_codes.h>
     23 #include <taler/taler_dbevents.h>
     24 #include <taler/taler_pq_lib.h>
     25 #include "pg_lookup_deposits.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Closure for #lookup_deposits_cb().
     30  */
     31 struct LookupDepositsContext
     32 {
     33   /**
     34    * Function to call with results.
     35    */
     36   TALER_MERCHANTDB_DepositsCallback cb;
     37 
     38   /**
     39    * Closure for @e cls.
     40    */
     41   void *cb_cls;
     42 
     43   /**
     44    * Plugin context.
     45    */
     46   struct PostgresClosure *pg;
     47 
     48   /**
     49    * Transaction status (set).
     50    */
     51   enum GNUNET_DB_QueryStatus qs;
     52 };
     53 
     54 
     55 /**
     56  * Function to be called with the results of a SELECT statement
     57  * that has returned @a num_results results.
     58  *
     59  * @param[in,out] cls of type `struct LookupDepositsContext *`
     60  * @param result the postgres result
     61  * @param num_results the number of results in @a result
     62  */
     63 static void
     64 lookup_deposits_cb (void *cls,
     65                     PGresult *result,
     66                     unsigned int num_results)
     67 {
     68   struct LookupDepositsContext *ldc = cls;
     69 
     70   for (unsigned int i = 0; i<num_results; i++)
     71   {
     72     struct TALER_CoinSpendPublicKeyP coin_pub;
     73     struct TALER_Amount amount_with_fee;
     74     struct TALER_Amount deposit_fee;
     75     struct TALER_Amount refund_fee;
     76     char *exchange_url;
     77     struct GNUNET_PQ_ResultSpec rs[] = {
     78       GNUNET_PQ_result_spec_string ("exchange_url",
     79                                     &exchange_url),
     80       GNUNET_PQ_result_spec_auto_from_type ("coin_pub",
     81                                             &coin_pub),
     82       TALER_PQ_result_spec_amount_with_currency ("amount_with_fee",
     83                                                  &amount_with_fee),
     84       TALER_PQ_result_spec_amount_with_currency ("deposit_fee",
     85                                                  &deposit_fee),
     86       TALER_PQ_result_spec_amount_with_currency ("refund_fee",
     87                                                  &refund_fee),
     88       GNUNET_PQ_result_spec_end
     89     };
     90 
     91     if (GNUNET_OK !=
     92         GNUNET_PQ_extract_result (result,
     93                                   rs,
     94                                   i))
     95     {
     96       GNUNET_break (0);
     97       ldc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     98       return;
     99     }
    100     ldc->cb (ldc->cb_cls,
    101              exchange_url,
    102              &coin_pub,
    103              &amount_with_fee,
    104              &deposit_fee,
    105              &refund_fee);
    106     GNUNET_PQ_cleanup_result (rs);
    107   }
    108   ldc->qs = num_results;
    109 }
    110 
    111 
    112 enum GNUNET_DB_QueryStatus
    113 TMH_PG_lookup_deposits (
    114   void *cls,
    115   const char *instance_id,
    116   const struct TALER_PrivateContractHashP *h_contract_terms,
    117   TALER_MERCHANTDB_DepositsCallback cb,
    118   void *cb_cls)
    119 {
    120   struct PostgresClosure *pg = cls;
    121   struct GNUNET_PQ_QueryParam params[] = {
    122     GNUNET_PQ_query_param_string (instance_id),
    123     GNUNET_PQ_query_param_auto_from_type (h_contract_terms),
    124     GNUNET_PQ_query_param_end
    125   };
    126   struct LookupDepositsContext ldc = {
    127     .cb = cb,
    128     .cb_cls = cb_cls,
    129     .pg = pg
    130   };
    131   enum GNUNET_DB_QueryStatus qs;
    132 
    133   /* no preflight check here, run in its own transaction by the caller! */
    134   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
    135               "Finding deposits for h_contract_terms '%s'\n",
    136               GNUNET_h2s (&h_contract_terms->hash));
    137   check_connection (pg);
    138   PREPARE (pg,
    139            "lookup_deposits",
    140            "SELECT"
    141            " dcom.exchange_url"
    142            ",dep.coin_pub"
    143            ",dep.amount_with_fee"
    144            ",dep.deposit_fee"
    145            ",dep.refund_fee"
    146            " FROM merchant_deposits dep"
    147            " JOIN merchant_deposit_confirmations dcom"
    148            "   USING (deposit_confirmation_serial)"
    149            " WHERE dcom.order_serial="
    150            "     (SELECT order_serial"
    151            "        FROM merchant_contract_terms"
    152            "        WHERE h_contract_terms=$2"
    153            "          AND merchant_serial="
    154            "          (SELECT merchant_serial"
    155            "             FROM merchant_instances"
    156            "            WHERE merchant_id=$1))");
    157   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    158                                              "lookup_deposits",
    159                                              params,
    160                                              &lookup_deposits_cb,
    161                                              &ldc);
    162   if (qs <= 0)
    163     return qs;
    164   return ldc.qs;
    165 }