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/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 "platform.h"
      22             : #include "taler_error_codes.h"
      23             : #include "taler_dbevents.h"
      24             : #include "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         134 : prewire_cb (void *cls,
      59             :             PGresult *result,
      60             :             unsigned int num_results)
      61             : {
      62         134 :   struct PrewireContext *pc = cls;
      63             : 
      64         210 :   for (unsigned int i = 0; i < num_results; i++)
      65             :   {
      66             :     uint64_t prewire_uuid;
      67             :     char *wire_method;
      68          76 :     void *buf = NULL;
      69             :     size_t buf_size;
      70          76 :     struct GNUNET_PQ_ResultSpec rs[] = {
      71          76 :       GNUNET_PQ_result_spec_uint64 ("prewire_uuid",
      72             :                                     &prewire_uuid),
      73          76 :       GNUNET_PQ_result_spec_string ("wire_method",
      74             :                                     &wire_method),
      75          76 :       GNUNET_PQ_result_spec_variable_size ("buf",
      76             :                                            &buf,
      77             :                                            &buf_size),
      78             :       GNUNET_PQ_result_spec_end
      79             :     };
      80             : 
      81          76 :     if (GNUNET_OK !=
      82          76 :         GNUNET_PQ_extract_result (result,
      83             :                                   rs,
      84             :                                   i))
      85             :     {
      86           0 :       GNUNET_break (0);
      87           0 :       pc->status = GNUNET_SYSERR;
      88           0 :       return;
      89             :     }
      90          76 :     pc->cb (pc->cb_cls,
      91             :             prewire_uuid,
      92             :             wire_method,
      93             :             buf,
      94             :             buf_size);
      95          76 :     GNUNET_PQ_cleanup_result (rs);
      96             :   }
      97             : }
      98             : 
      99             : 
     100             : enum GNUNET_DB_QueryStatus
     101         134 : 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         134 :   struct PostgresClosure *pg = cls;
     108         134 :   struct GNUNET_PQ_QueryParam params[] = {
     109         134 :     GNUNET_PQ_query_param_uint64 (&start_row),
     110         134 :     GNUNET_PQ_query_param_uint64 (&limit),
     111             :     GNUNET_PQ_query_param_end
     112             :   };
     113         134 :   struct PrewireContext pc = {
     114             :     .cb = cb,
     115             :     .cb_cls = cb_cls,
     116             :     .status = GNUNET_OK
     117             :   };
     118             :   enum GNUNET_DB_QueryStatus qs;
     119             : 
     120         134 :   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         134 :   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     133             :                                              "wire_prepare_data_get",
     134             :                                              params,
     135             :                                              &prewire_cb,
     136             :                                              &pc);
     137         134 :   if (GNUNET_OK != pc.status)
     138           0 :     return GNUNET_DB_STATUS_HARD_ERROR;
     139         134 :   return qs;
     140             : }