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Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_progress_points.c (3653B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 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 auditordb/pg_get_progress_points.c
     18  * @brief Implementation of the get_progress_points 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_get_progress_points.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 struct ProgressContext
     30 {
     31 
     32   /**
     33    * Function to call for each progress point.
     34    */
     35   TALER_AUDITORDB_ProgressPointsCallback cb;
     36 
     37   /**
     38    * Closure for @e cb
     39    */
     40   void *cb_cls;
     41 
     42   /**
     43    * Plugin context.
     44    */
     45   struct PostgresClosure *pg;
     46 
     47   /**
     48    * Query status to return.
     49    */
     50   enum GNUNET_DB_QueryStatus qs;
     51 };
     52 
     53 
     54 /**
     55  * Helper function for #TAH_PG_get_progress_points().
     56  * To be called with the results of a SELECT statement
     57  * that has returned @a num_results results.
     58  *
     59  * @param cls closure of type `struct ProgressContext *`
     60  * @param result the postgres result
     61  * @param num_results the number of results in @a result
     62  */
     63 static void
     64 progress_cb (void *cls,
     65              PGresult *result,
     66              unsigned int num_results)
     67 {
     68   struct ProgressContext *dcc = cls;
     69 
     70   for (unsigned int i = 0; i < num_results; i++)
     71   {
     72     struct TALER_AUDITORDB_Progress dc;
     73     struct GNUNET_PQ_ResultSpec rs[] = {
     74       GNUNET_PQ_result_spec_string ("progress_key",
     75                                     &dc.progress_key),
     76       GNUNET_PQ_result_spec_uint64 ("progress_offset",
     77                                     &dc.progress_offset),
     78       GNUNET_PQ_result_spec_end
     79     };
     80     enum GNUNET_GenericReturnValue rval;
     81 
     82     if (GNUNET_OK !=
     83         GNUNET_PQ_extract_result (result,
     84                                   rs,
     85                                   i))
     86     {
     87       GNUNET_break (0);
     88       dcc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     89       return;
     90     }
     91     dcc->qs = i + 1;
     92     rval = dcc->cb (dcc->cb_cls,
     93                     &dc);
     94     GNUNET_PQ_cleanup_result (rs);
     95     if (GNUNET_OK != rval)
     96       break;
     97   }
     98 }
     99 
    100 
    101 enum GNUNET_DB_QueryStatus
    102 TAH_PG_get_progress_points (
    103   void *cls,
    104   const char *progress_key,
    105   TALER_AUDITORDB_ProgressPointsCallback cb,
    106   void *cb_cls)
    107 {
    108   struct PostgresClosure *pg = cls;
    109   struct GNUNET_PQ_QueryParam params[] = {
    110     NULL == progress_key
    111     ? GNUNET_PQ_query_param_null ()
    112     : GNUNET_PQ_query_param_string (progress_key),
    113     GNUNET_PQ_query_param_end
    114   };
    115   struct ProgressContext dcc = {
    116     .cb = cb,
    117     .cb_cls = cb_cls,
    118     .pg = pg
    119   };
    120   enum GNUNET_DB_QueryStatus qs;
    121 
    122   PREPARE (pg,
    123            "auditor_progress_points_get",
    124            "SELECT"
    125            " progress_key"
    126            ",progress_offset"
    127            " FROM auditor_progress"
    128            " WHERE ($1::TEXT IS NULL OR progress_key = $1)"
    129            );
    130   qs = GNUNET_PQ_eval_prepared_multi_select (
    131     pg->conn,
    132     "auditor_progress_points_get",
    133     params,
    134     &progress_cb,
    135     &dcc);
    136   if (qs > 0)
    137     return dcc.qs;
    138   GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
    139   return qs;
    140 }