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Base system with REST service to issue digital coins, run by the payment service provider
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pg_wire_prepare_data_get.c (4028B)

      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/pg_wire_prepare_data_get.c
     18  * @brief Implementation of the wire_prepare_data_get function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "taler/exchange-database/wire_prepare_data_get.h"
     23 #include "helper.h"
     24 
     25 /**
     26  * Closure for #prewire_cb().
     27  */
     28 struct PrewireContext
     29 {
     30   /**
     31    * Function to call on each result.
     32    */
     33   TALER_EXCHANGEDB_WirePreparationIterator cb;
     34 
     35   /**
     36    * Closure for @a cb.
     37    */
     38   void *cb_cls;
     39 
     40   /**
     41    * #GNUNET_OK if everything went fine.
     42    */
     43   enum GNUNET_GenericReturnValue status;
     44 };
     45 
     46 
     47 /**
     48  * Invoke the callback for each result.
     49  *
     50  * @param cls a `struct MissingWireContext *`
     51  * @param result SQL result
     52  * @param num_results number of rows in @a result
     53  */
     54 static void
     55 prewire_cb (void *cls,
     56             PGresult *result,
     57             unsigned int num_results)
     58 {
     59   struct PrewireContext *pc = cls;
     60 
     61   for (unsigned int i = 0; i < num_results; i++)
     62   {
     63     uint64_t prewire_uuid;
     64     char *wire_method;
     65     void *buf = NULL;
     66     size_t buf_size;
     67     struct GNUNET_PQ_ResultSpec rs[] = {
     68       GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
     69                                     &prewire_uuid),
     70       GNUNET_PQ_result_spec_string ("wire_method",
     71                                     &wire_method),
     72       GNUNET_PQ_result_spec_variable_size ("buf",
     73                                            &buf,
     74                                            &buf_size),
     75       GNUNET_PQ_result_spec_end
     76     };
     77 
     78     if (GNUNET_OK !=
     79         GNUNET_PQ_extract_result (result,
     80                                   rs,
     81                                   i))
     82     {
     83       GNUNET_break (0);
     84       pc->status = GNUNET_SYSERR;
     85       return;
     86     }
     87     pc->cb (pc->cb_cls,
     88             prewire_uuid,
     89             wire_method,
     90             buf,
     91             buf_size);
     92     GNUNET_PQ_cleanup_result (rs);
     93   }
     94 }
     95 
     96 
     97 enum GNUNET_DB_QueryStatus
     98 TALER_EXCHANGEDB_wire_prepare_data_get (struct
     99                                         TALER_EXCHANGEDB_PostgresContext *pg,
    100                                         uint64_t start_row,
    101                                         uint64_t limit,
    102                                         TALER_EXCHANGEDB_WirePreparationIterator
    103                                         cb,
    104                                         void *cb_cls)
    105 {
    106   struct GNUNET_PQ_QueryParam params[] = {
    107     GNUNET_PQ_query_param_uint64 (&start_row),
    108     GNUNET_PQ_query_param_uint64 (&limit),
    109     GNUNET_PQ_query_param_end
    110   };
    111   struct PrewireContext pc = {
    112     .cb = cb,
    113     .cb_cls = cb_cls,
    114     .status = GNUNET_OK
    115   };
    116   enum GNUNET_DB_QueryStatus qs;
    117 
    118   PREPARE (pg,
    119            "wire_prepare_data_get",
    120            "SELECT"
    121            " prewire_uuid"
    122            ",wire_method"
    123            ",buf"
    124            " FROM prewire"
    125            " WHERE prewire_uuid >= $1"
    126            "   AND finished=FALSE"
    127            "   AND failed=FALSE"
    128            " ORDER BY prewire_uuid ASC"
    129            " LIMIT $2;");
    130   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    131                                              "wire_prepare_data_get",
    132                                              params,
    133                                              &prewire_cb,
    134                                              &pc);
    135   if (GNUNET_OK != pc.status)
    136     return GNUNET_DB_STATUS_HARD_ERROR;
    137   return qs;
    138 }