donau

Donation authority for GNU Taler (experimental)
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insert_history_entry.c (2646B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2023 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 src/donaudb/insert_history_entry.c
     18  * @brief Implementation of the insert_history_entry function for Postgres
     19  * @author Johannes Casaburi
     20  */
     21 #include <donau_config.h>
     22 #include <taler/taler_error_codes.h>
     23 #include <taler/taler_dbevents.h>
     24 #include <taler/taler_pq_lib.h>
     25 #include "insert_history_entry.h"
     26 #include "helper.h"
     27 
     28 enum GNUNET_DB_QueryStatus
     29 DONAUDB_insert_history_entry (struct DONAUDB_PostgresContext *ctx,
     30                               const uint64_t charity_id,
     31                               const struct TALER_Amount *final_amount,
     32                               const uint64_t donation_year)
     33 {
     34   struct GNUNET_PQ_QueryParam params[] = {
     35     GNUNET_PQ_query_param_uint64 (&charity_id),
     36     TALER_PQ_query_param_amount (ctx->conn,
     37                                  final_amount),
     38     GNUNET_PQ_query_param_uint64 (&donation_year),
     39     GNUNET_PQ_query_param_end
     40   };
     41   uint64_t out_charity_id;
     42   struct GNUNET_PQ_ResultSpec rs[] = {
     43     GNUNET_PQ_result_spec_uint64 ("charity_id",
     44                                   &out_charity_id),
     45     GNUNET_PQ_result_spec_end
     46   };
     47 
     48   /* The RETURNING clause is what makes "written" distinguishable from
     49      "a row for this (charity,year) already exists": without it, the
     50      unique violation would be mapped to SUCCESS_NO_RESULTS, which is
     51      also what a caller checking only for `qs < 0' reads as success. */
     52   PREPARE (ctx,
     53            "insert_history_entry",
     54            "INSERT INTO history "
     55            "(charity_id"
     56            ",final_amount"
     57            ",donation_year"
     58            ") VALUES "
     59            "($1, $2, $3)"
     60            " ON CONFLICT (charity_id, donation_year) DO NOTHING"
     61            " RETURNING charity_id;");
     62   return GNUNET_PQ_eval_prepared_singleton_select (ctx->conn,
     63                                                    "insert_history_entry",
     64                                                    params,
     65                                                    rs);
     66 }