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Base system with REST service to issue digital coins, run by the payment service provider
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select_purse_decisions_above_serial_id.c (4859B)

      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 exchangedb/select_purse_decisions_above_serial_id.c
     18  * @brief Implementation of the select_purse_decisions_above_serial_id function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/select_purse_decisions_above_serial_id.h"
     23 #include "helper.h"
     24 
     25 /**
     26  * Closure for #purse_decision_serial_helper_cb().
     27  */
     28 struct PurseDecisionSerialContext
     29 {
     30 
     31   /**
     32    * Callback to call.
     33    */
     34   TALER_EXCHANGEDB_PurseDecisionCallback cb;
     35 
     36   /**
     37    * Closure for @e cb.
     38    */
     39   void *cb_cls;
     40 
     41   /**
     42    * Plugin context.
     43    */
     44   struct TALER_EXCHANGEDB_PostgresContext *pg;
     45 
     46   /**
     47    * Status code, set to #GNUNET_SYSERR on hard errors.
     48    */
     49   enum GNUNET_GenericReturnValue status;
     50 };
     51 
     52 
     53 /**
     54  * Helper function to be called with the results of a SELECT statement
     55  * that has returned @a num_results results.
     56  *
     57  * @param cls closure of type `struct PurseRefundSerialContext`
     58  * @param result the postgres result
     59  * @param num_results the number of results in @a result
     60  */
     61 static void
     62 purse_decision_serial_helper_cb (void *cls,
     63                                  PGresult *result,
     64                                  unsigned int num_results)
     65 {
     66   struct PurseDecisionSerialContext *dsc = cls;
     67   struct TALER_EXCHANGEDB_PostgresContext *pg = dsc->pg;
     68 
     69   for (unsigned int i = 0; i<num_results; i++)
     70   {
     71     struct TALER_PurseContractPublicKeyP purse_pub;
     72     struct TALER_ReservePublicKeyP reserve_pub;
     73     bool no_reserve = true;
     74     uint64_t rowid;
     75     struct TALER_Amount val;
     76     struct GNUNET_PQ_ResultSpec rs[] = {
     77       GNUNET_PQ_result_spec_auto_from_type ("purse_pub",
     78                                             &purse_pub),
     79       GNUNET_PQ_result_spec_allow_null (
     80         GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
     81                                               &reserve_pub),
     82         &no_reserve),
     83       TALER_PQ_RESULT_SPEC_AMOUNT ("amount_with_fee",
     84                                    &val),
     85       GNUNET_PQ_result_spec_uint64 ("purse_decision_serial_id",
     86                                     &rowid),
     87       GNUNET_PQ_result_spec_end
     88     };
     89     enum GNUNET_GenericReturnValue ret;
     90 
     91     if (GNUNET_OK !=
     92         GNUNET_PQ_extract_result (result,
     93                                   rs,
     94                                   i))
     95     {
     96       GNUNET_break (0);
     97       dsc->status = GNUNET_SYSERR;
     98       return;
     99     }
    100     ret = dsc->cb (dsc->cb_cls,
    101                    rowid,
    102                    &purse_pub,
    103                    no_reserve ? NULL : &reserve_pub,
    104                    &val);
    105     GNUNET_PQ_cleanup_result (rs);
    106     if (GNUNET_OK != ret)
    107       break;
    108   }
    109 }
    110 
    111 
    112 enum GNUNET_DB_QueryStatus
    113 TALER_TALER_EXCHANGEDB_select_purse_decisions_above_serial_id (
    114   struct TALER_EXCHANGEDB_PostgresContext *pg,
    115   uint64_t serial_id,
    116   bool refunded,
    117   TALER_EXCHANGEDB_PurseDecisionCallback cb,
    118   void *cb_cls)
    119 {
    120   struct GNUNET_PQ_QueryParam params[] = {
    121     GNUNET_PQ_query_param_uint64 (&serial_id),
    122     GNUNET_PQ_query_param_bool (refunded),
    123     GNUNET_PQ_query_param_end
    124   };
    125   struct PurseDecisionSerialContext dsc = {
    126     .cb = cb,
    127     .cb_cls = cb_cls,
    128     .pg = pg,
    129     .status = GNUNET_OK
    130   };
    131   enum GNUNET_DB_QueryStatus qs;
    132 
    133   PREPARE (pg,
    134            "audit_get_purse_decisions_incr",
    135            "SELECT"
    136            " pd.purse_pub"
    137            ",pm.reserve_pub"
    138            ",pd.purse_decision_serial_id"
    139            ",pr.amount_with_fee"
    140            " FROM purse_decision pd"
    141            " JOIN purse_requests pr ON (pd.purse_pub = pr.purse_pub)"
    142            " LEFT JOIN purse_merges pm ON (pm.purse_pub = pd.purse_pub)"
    143            " WHERE ("
    144            "  (purse_decision_serial_id>=$1) AND "
    145            "  (refunded=$2)"
    146            " )"
    147            " ORDER BY purse_decision_serial_id ASC;");
    148 
    149 
    150   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    151                                              "audit_get_purse_decisions_incr",
    152                                              params,
    153                                              &purse_decision_serial_helper_cb,
    154                                              &dsc);
    155   if (GNUNET_OK != dsc.status)
    156     return GNUNET_DB_STATUS_HARD_ERROR;
    157   return qs;
    158 }