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Base system with REST service to issue digital coins, run by the payment service provider
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pg_select_aggregations_above_serial.c (4203B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2023, 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_aggregations_above_serial.c
     18  * @brief Implementation of the select_aggregations_above_serial function for Postgres
     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_select_aggregations_above_serial.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Closure for #aggregation_serial_helper_cb().
     30  */
     31 struct AggregationSerialContext
     32 {
     33 
     34   /**
     35    * Callback to call.
     36    */
     37   TALER_EXCHANGEDB_AggregationCallback cb;
     38 
     39   /**
     40    * Closure for @e cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Plugin context.
     46    */
     47   struct PostgresClosure *pg;
     48 
     49   /**
     50    * Status code, set to #GNUNET_SYSERR on hard errors.
     51    */
     52   enum GNUNET_GenericReturnValue status;
     53 };
     54 
     55 
     56 /**
     57  * Helper function to be called with the results of a SELECT statement
     58  * that has returned @a num_results results.
     59  *
     60  * @param cls closure of type `struct AggregationSerialContext`
     61  * @param result the postgres result
     62  * @param num_results the number of results in @a result
     63  */
     64 static void
     65 aggregation_serial_helper_cb (void *cls,
     66                               PGresult *result,
     67                               unsigned int num_results)
     68 {
     69   struct AggregationSerialContext *dsc = cls;
     70   struct PostgresClosure *pg = dsc->pg;
     71 
     72   for (unsigned int i = 0; i<num_results; i++)
     73   {
     74     uint64_t tracking_rowid;
     75     uint64_t batch_deposit_serial_id;
     76     struct TALER_Amount amount;
     77     struct GNUNET_PQ_ResultSpec rs[] = {
     78       TALER_PQ_RESULT_SPEC_AMOUNT ("total_amount",
     79                                    &amount),
     80       GNUNET_PQ_result_spec_uint64 ("aggregation_serial_id",
     81                                     &tracking_rowid),
     82       GNUNET_PQ_result_spec_uint64 ("batch_deposit_serial_id",
     83                                     &batch_deposit_serial_id),
     84       GNUNET_PQ_result_spec_end
     85     };
     86 
     87     if (GNUNET_OK !=
     88         GNUNET_PQ_extract_result (result,
     89                                   rs,
     90                                   i))
     91     {
     92       GNUNET_break (0);
     93       dsc->status = GNUNET_SYSERR;
     94       return;
     95     }
     96     dsc->cb (dsc->cb_cls,
     97              &amount,
     98              tracking_rowid,
     99              batch_deposit_serial_id);
    100     GNUNET_PQ_cleanup_result (rs);
    101   }
    102 }
    103 
    104 
    105 enum GNUNET_DB_QueryStatus
    106 TEH_PG_select_aggregations_above_serial (
    107   void *cls,
    108   uint64_t min_tracking_serial_id,
    109   TALER_EXCHANGEDB_AggregationCallback cb,
    110   void *cb_cls)
    111 {
    112   struct PostgresClosure *pg = cls;
    113   struct GNUNET_PQ_QueryParam params[] = {
    114     GNUNET_PQ_query_param_uint64 (&min_tracking_serial_id),
    115     GNUNET_PQ_query_param_end
    116   };
    117   struct AggregationSerialContext asc = {
    118     .cb = cb,
    119     .cb_cls = cb_cls,
    120     .pg = pg,
    121     .status = GNUNET_OK
    122   };
    123   enum GNUNET_DB_QueryStatus qs;
    124 
    125   /* Fetch aggregations with rowid '\geq' the given parameter */
    126   PREPARE (pg,
    127            "select_aggregations_above_serial",
    128            "SELECT"
    129            " aggregation_serial_id"
    130            ",batch_deposit_serial_id"
    131            ",total_amount"
    132            " FROM exchange_do_select_aggregations_above_serial($1);");
    133   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    134                                              "select_aggregations_above_serial",
    135                                              params,
    136                                              &aggregation_serial_helper_cb,
    137                                              &asc);
    138   if (GNUNET_OK != asc.status)
    139     return GNUNET_DB_STATUS_HARD_ERROR;
    140   return qs;
    141 }