merchant

Merchant backend to process payments, run by merchants
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pg_select_open_transfers.c (4618B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022, 2025 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 backenddb/pg_select_open_transfers.c
     18  * @brief Implementation of the select_open_transfers function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "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_select_open_transfers.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Context used for open_transfers_cb().
     31  */
     32 struct SelectOpenTransfersContext
     33 {
     34   /**
     35    * Postgres context.
     36    */
     37   struct PostgresClosure *pg;
     38 
     39   /**
     40    * Function to call with the results.
     41    */
     42   TALER_MERCHANTDB_OpenTransferCallback cb;
     43 
     44   /**
     45    * Closure for @a cb.
     46    */
     47   void *cb_cls;
     48 
     49   /**
     50    * Internal result.
     51    */
     52   enum GNUNET_DB_QueryStatus qs;
     53 };
     54 
     55 
     56 /**
     57  * Function to be called with the results of a SELECT statement
     58  * that has returned @a num_results results about rewards.
     59  *
     60  * @param[in,out] cls of type `struct SelectOpenTransfersContext *`
     61  * @param result the postgres result
     62  * @param num_results the number of results in @a result
     63  */
     64 static void
     65 open_transfers_cb (void *cls,
     66                    PGresult *result,
     67                    unsigned int num_results)
     68 {
     69   struct SelectOpenTransfersContext *plc = cls;
     70 
     71   for (unsigned int i = 0; i < num_results; i++)
     72   {
     73     uint64_t rowid;
     74     char *instance_id;
     75     char *exchange_url;
     76     struct TALER_FullPayto payto_uri;
     77     struct TALER_WireTransferIdentifierRawP wtid;
     78     struct GNUNET_TIME_Absolute retry_time;
     79     struct GNUNET_PQ_ResultSpec rs[] = {
     80       GNUNET_PQ_result_spec_uint64 ("expected_credit_serial",
     81                                     &rowid),
     82       GNUNET_PQ_result_spec_string ("instance_id",
     83                                     &instance_id),
     84       GNUNET_PQ_result_spec_string ("exchange_url",
     85                                     &exchange_url),
     86       GNUNET_PQ_result_spec_string ("payto_uri",
     87                                     &payto_uri.full_payto),
     88       GNUNET_PQ_result_spec_auto_from_type ("wtid",
     89                                             &wtid),
     90       GNUNET_PQ_result_spec_absolute_time ("retry_time",
     91                                            &retry_time),
     92       GNUNET_PQ_result_spec_end
     93     };
     94 
     95     if (GNUNET_OK !=
     96         GNUNET_PQ_extract_result (result,
     97                                   rs,
     98                                   i))
     99     {
    100       GNUNET_break (0);
    101       plc->qs = GNUNET_DB_STATUS_HARD_ERROR;
    102       return;
    103     }
    104     plc->cb (plc->cb_cls,
    105              rowid,
    106              instance_id,
    107              exchange_url,
    108              payto_uri,
    109              &wtid,
    110              retry_time);
    111     GNUNET_PQ_cleanup_result (rs);
    112   }
    113 }
    114 
    115 
    116 enum GNUNET_DB_QueryStatus
    117 TMH_PG_select_open_transfers (void *cls,
    118                               uint64_t limit,
    119                               TALER_MERCHANTDB_OpenTransferCallback cb,
    120                               void *cb_cls)
    121 {
    122   struct PostgresClosure *pg = cls;
    123   struct SelectOpenTransfersContext plc = {
    124     .pg = pg,
    125     .cb = cb,
    126     .cb_cls = cb_cls
    127   };
    128   struct GNUNET_PQ_QueryParam params[] = {
    129     GNUNET_PQ_query_param_uint64 (&limit),
    130     GNUNET_PQ_query_param_end
    131   };
    132   enum GNUNET_DB_QueryStatus qs;
    133 
    134   PREPARE (pg,
    135            "select_open_transfers",
    136            "SELECT"
    137            " met.expected_credit_serial"
    138            ",mi.merchant_id AS instance_id"
    139            ",met.exchange_url"
    140            ",ma.payto_uri"
    141            ",met.wtid"
    142            ",met.retry_time"
    143            " FROM merchant_expected_transfers met"
    144            " JOIN merchant_accounts ma"
    145            "   USING (account_serial)"
    146            " JOIN merchant_instances mi"
    147            "   ON (ma.merchant_serial=mi.merchant_serial)"
    148            " WHERE retry_needed"
    149            " ORDER BY retry_time ASC"
    150            " LIMIT $1;");
    151   qs = GNUNET_PQ_eval_prepared_multi_select (
    152     pg->conn,
    153     "select_open_transfers",
    154     params,
    155     &open_transfers_cb,
    156     &plc);
    157   if (0 != plc.qs)
    158     return plc.qs;
    159   return qs;
    160 }