Line data    Source code

       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/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 "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          108 : prewire_cb (void *cls,
      56              :             PGresult *result,
      57              :             unsigned int num_results)
      58              : {
      59          108 :   struct PrewireContext *pc = cls;
      60              : 
      61          169 :   for (unsigned int i = 0; i < num_results; i++)
      62              :   {
      63              :     uint64_t prewire_uuid;
      64              :     char *wire_method;
      65           61 :     void *buf = NULL;
      66              :     size_t buf_size;
      67           61 :     struct GNUNET_PQ_ResultSpec rs[] = {
      68           61 :       GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
      69              :                                     &prewire_uuid),
      70           61 :       GNUNET_PQ_result_spec_string ("wire_method",
      71              :                                     &wire_method),
      72           61 :       GNUNET_PQ_result_spec_variable_size ("buf",
      73              :                                            &buf,
      74              :                                            &buf_size),
      75              :       GNUNET_PQ_result_spec_end
      76              :     };
      77              : 
      78           61 :     if (GNUNET_OK !=
      79           61 :         GNUNET_PQ_extract_result (result,
      80              :                                   rs,
      81              :                                   i))
      82              :     {
      83            0 :       GNUNET_break (0);
      84            0 :       pc->status = GNUNET_SYSERR;
      85            0 :       return;
      86              :     }
      87           61 :     pc->cb (pc->cb_cls,
      88              :             prewire_uuid,
      89              :             wire_method,
      90              :             buf,
      91              :             buf_size);
      92           61 :     GNUNET_PQ_cleanup_result (rs);
      93              :   }
      94              : }
      95              : 
      96              : 
      97              : enum GNUNET_DB_QueryStatus
      98          108 : 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          108 :   struct GNUNET_PQ_QueryParam params[] = {
     107          108 :     GNUNET_PQ_query_param_uint64 (&start_row),
     108          108 :     GNUNET_PQ_query_param_uint64 (&limit),
     109              :     GNUNET_PQ_query_param_end
     110              :   };
     111          108 :   struct PrewireContext pc = {
     112              :     .cb = cb,
     113              :     .cb_cls = cb_cls,
     114              :     .status = GNUNET_OK
     115              :   };
     116              :   enum GNUNET_DB_QueryStatus qs;
     117              : 
     118          108 :   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          108 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     131              :                                              "wire_prepare_data_get",
     132              :                                              params,
     133              :                                              &prewire_cb,
     134              :                                              &pc);
     135          108 :   if (GNUNET_OK != pc.status)
     136            0 :     return GNUNET_DB_STATUS_HARD_ERROR;
     137          108 :   return qs;
     138              : }