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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 (3981B)

      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/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_wire_prepare_data_get.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Closure for #prewire_cb().
     30  */
     31 struct PrewireContext
     32 {
     33   /**
     34    * Function to call on each result.
     35    */
     36   TALER_EXCHANGEDB_WirePreparationIterator cb;
     37 
     38   /**
     39    * Closure for @a cb.
     40    */
     41   void *cb_cls;
     42 
     43   /**
     44    * #GNUNET_OK if everything went fine.
     45    */
     46   enum GNUNET_GenericReturnValue status;
     47 };
     48 
     49 
     50 /**
     51  * Invoke the callback for each result.
     52  *
     53  * @param cls a `struct MissingWireContext *`
     54  * @param result SQL result
     55  * @param num_results number of rows in @a result
     56  */
     57 static void
     58 prewire_cb (void *cls,
     59             PGresult *result,
     60             unsigned int num_results)
     61 {
     62   struct PrewireContext *pc = cls;
     63 
     64   for (unsigned int i = 0; i < num_results; i++)
     65   {
     66     uint64_t prewire_uuid;
     67     char *wire_method;
     68     void *buf = NULL;
     69     size_t buf_size;
     70     struct GNUNET_PQ_ResultSpec rs[] = {
     71       GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
     72                                     &prewire_uuid),
     73       GNUNET_PQ_result_spec_string ("wire_method",
     74                                     &wire_method),
     75       GNUNET_PQ_result_spec_variable_size ("buf",
     76                                            &buf,
     77                                            &buf_size),
     78       GNUNET_PQ_result_spec_end
     79     };
     80 
     81     if (GNUNET_OK !=
     82         GNUNET_PQ_extract_result (result,
     83                                   rs,
     84                                   i))
     85     {
     86       GNUNET_break (0);
     87       pc->status = GNUNET_SYSERR;
     88       return;
     89     }
     90     pc->cb (pc->cb_cls,
     91             prewire_uuid,
     92             wire_method,
     93             buf,
     94             buf_size);
     95     GNUNET_PQ_cleanup_result (rs);
     96   }
     97 }
     98 
     99 
    100 enum GNUNET_DB_QueryStatus
    101 TEH_PG_wire_prepare_data_get (void *cls,
    102                               uint64_t start_row,
    103                               uint64_t limit,
    104                               TALER_EXCHANGEDB_WirePreparationIterator cb,
    105                               void *cb_cls)
    106 {
    107   struct PostgresClosure *pg = cls;
    108   struct GNUNET_PQ_QueryParam params[] = {
    109     GNUNET_PQ_query_param_uint64 (&start_row),
    110     GNUNET_PQ_query_param_uint64 (&limit),
    111     GNUNET_PQ_query_param_end
    112   };
    113   struct PrewireContext pc = {
    114     .cb = cb,
    115     .cb_cls = cb_cls,
    116     .status = GNUNET_OK
    117   };
    118   enum GNUNET_DB_QueryStatus qs;
    119 
    120   PREPARE (pg,
    121            "wire_prepare_data_get",
    122            "SELECT"
    123            " prewire_uuid"
    124            ",wire_method"
    125            ",buf"
    126            " FROM prewire"
    127            " WHERE prewire_uuid >= $1"
    128            "   AND finished=FALSE"
    129            "   AND failed=FALSE"
    130            " ORDER BY prewire_uuid ASC"
    131            " LIMIT $2;");
    132   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    133                                              "wire_prepare_data_get",
    134                                              params,
    135                                              &prewire_cb,
    136                                              &pc);
    137   if (GNUNET_OK != pc.status)
    138     return GNUNET_DB_STATUS_HARD_ERROR;
    139   return qs;
    140 }