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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_wire_out_above_serial_id.c (4383B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022, 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_wire_out_above_serial_id.c
     18  * @brief Implementation of the select_wire_out_above_serial_id function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "taler/exchange-database/select_wire_out_above_serial_id.h"
     23 #include "helper.h"
     24 
     25 /**
     26  * Closure for #wire_out_serial_helper_cb().
     27  */
     28 struct WireOutSerialContext
     29 {
     30 
     31   /**
     32    * Callback to call.
     33    */
     34   TALER_EXCHANGEDB_WireTransferOutCallback 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   int 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 WireOutSerialContext`
     58  * @param result the postgres result
     59  * @param num_results the number of results in @a result
     60  */
     61 static void
     62 wire_out_serial_helper_cb (void *cls,
     63                            PGresult *result,
     64                            unsigned int num_results)
     65 {
     66   struct WireOutSerialContext *wosc = cls;
     67   struct TALER_EXCHANGEDB_PostgresContext *pg = wosc->pg;
     68 
     69   for (unsigned int i = 0; i<num_results; i++)
     70   {
     71     uint64_t rowid;
     72     struct GNUNET_TIME_Timestamp date;
     73     struct TALER_WireTransferIdentifierRawP wtid;
     74     struct TALER_FullPayto payto_uri;
     75     struct TALER_Amount amount;
     76     struct GNUNET_PQ_ResultSpec rs[] = {
     77       GNUNET_PQ_result_spec_uint64 ("wireout_uuid",
     78                                     &rowid),
     79       GNUNET_PQ_result_spec_timestamp ("execution_date",
     80                                        &date),
     81       GNUNET_PQ_result_spec_auto_from_type ("wtid_raw",
     82                                             &wtid),
     83       GNUNET_PQ_result_spec_string ("payto_uri",
     84                                     &payto_uri.full_payto),
     85       TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
     86                                    &amount),
     87       GNUNET_PQ_result_spec_end
     88     };
     89     int ret;
     90 
     91     if (GNUNET_OK !=
     92         GNUNET_PQ_extract_result (result,
     93                                   rs,
     94                                   i))
     95     {
     96       GNUNET_break (0);
     97       wosc->status = GNUNET_SYSERR;
     98       return;
     99     }
    100     ret = wosc->cb (wosc->cb_cls,
    101                     rowid,
    102                     date,
    103                     &wtid,
    104                     payto_uri,
    105                     &amount);
    106     GNUNET_PQ_cleanup_result (rs);
    107     if (GNUNET_OK != ret)
    108       break;
    109   }
    110 }
    111 
    112 
    113 enum GNUNET_DB_QueryStatus
    114 TALER_EXCHANGEDB_select_wire_out_above_serial_id (
    115   struct TALER_EXCHANGEDB_PostgresContext *pg,
    116   uint64_t serial_id,
    117   TALER_EXCHANGEDB_WireTransferOutCallback 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_end
    123   };
    124   struct WireOutSerialContext wosc = {
    125     .cb = cb,
    126     .cb_cls = cb_cls,
    127     .pg = pg,
    128     .status = GNUNET_OK
    129   };
    130   enum GNUNET_DB_QueryStatus qs;
    131 
    132   PREPARE (pg,
    133            "select_wire_out_above_serial_id",
    134            "SELECT"
    135            " wo.wireout_uuid"
    136            ",wo.execution_date"
    137            ",wo.wtid_raw"
    138            ",wt.payto_uri"
    139            ",wo.amount"
    140            " FROM wire_out wo"
    141            " JOIN wire_targets wt"
    142            "   USING (wire_target_h_payto)"
    143            " WHERE wireout_uuid>=$1"
    144            " ORDER BY wireout_uuid ASC;");
    145   qs = GNUNET_PQ_eval_prepared_multi_select (
    146     pg->conn,
    147     "select_wire_out_above_serial_id",
    148     params,
    149     &wire_out_serial_helper_cb,
    150     &wosc);
    151   if (GNUNET_OK != wosc.status)
    152     return GNUNET_DB_STATUS_HARD_ERROR;
    153   return qs;
    154 }