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 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          10 : open_transfers_cb (void *cls,
      66             :                    PGresult *result,
      67             :                    unsigned int num_results)
      68             : {
      69          10 :   struct SelectOpenTransfersContext *plc = cls;
      70             : 
      71          20 :   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 TALER_Amount total;
      79             :     struct GNUNET_TIME_Absolute next_attempt;
      80          10 :     struct GNUNET_PQ_ResultSpec rs[] = {
      81          10 :       GNUNET_PQ_result_spec_uint64 ("credit_serial",
      82             :                                     &rowid),
      83          10 :       GNUNET_PQ_result_spec_string ("instance_id",
      84             :                                     &instance_id),
      85          10 :       GNUNET_PQ_result_spec_string ("exchange_url",
      86             :                                     &exchange_url),
      87          10 :       GNUNET_PQ_result_spec_string ("payto_uri",
      88             :                                     &payto_uri.full_payto),
      89          10 :       GNUNET_PQ_result_spec_auto_from_type ("wtid",
      90             :                                             &wtid),
      91          10 :       TALER_PQ_result_spec_amount_with_currency ("credit_amount",
      92             :                                                  &total),
      93          10 :       GNUNET_PQ_result_spec_absolute_time ("next_attempt",
      94             :                                            &next_attempt),
      95             :       GNUNET_PQ_result_spec_end
      96             :     };
      97             : 
      98          10 :     if (GNUNET_OK !=
      99          10 :         GNUNET_PQ_extract_result (result,
     100             :                                   rs,
     101             :                                   i))
     102             :     {
     103           0 :       GNUNET_break (0);
     104           0 :       plc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     105           0 :       return;
     106             :     }
     107          10 :     plc->cb (plc->cb_cls,
     108             :              rowid,
     109             :              instance_id,
     110             :              exchange_url,
     111             :              payto_uri,
     112             :              &wtid,
     113             :              &total,
     114             :              next_attempt);
     115          10 :     GNUNET_PQ_cleanup_result (rs);
     116             :   }
     117             : }
     118             : 
     119             : 
     120             : enum GNUNET_DB_QueryStatus
     121          10 : TMH_PG_select_open_transfers (void *cls,
     122             :                               uint64_t limit,
     123             :                               TALER_MERCHANTDB_OpenTransferCallback cb,
     124             :                               void *cb_cls)
     125             : {
     126          10 :   struct PostgresClosure *pg = cls;
     127          10 :   struct SelectOpenTransfersContext plc = {
     128             :     .pg = pg,
     129             :     .cb = cb,
     130             :     .cb_cls = cb_cls
     131             :   };
     132          10 :   struct GNUNET_PQ_QueryParam params[] = {
     133          10 :     GNUNET_PQ_query_param_uint64 (&limit),
     134             :     GNUNET_PQ_query_param_end
     135             :   };
     136             :   enum GNUNET_DB_QueryStatus qs;
     137             : 
     138          10 :   PREPARE (pg,
     139             :            "select_open_transfers",
     140             :            "SELECT"
     141             :            " credit_serial"
     142             :            ",merchant_id AS instance_id"
     143             :            ",exchange_url"
     144             :            ",payto_uri"
     145             :            ",wtid"
     146             :            ",credit_amount"
     147             :            ",ready_time AS next_attempt"
     148             :            " FROM merchant_transfers"
     149             :            " JOIN merchant_accounts"
     150             :            "   USING (account_serial)"
     151             :            " JOIN merchant_instances"
     152             :            "   USING (merchant_serial)"
     153             :            " WHERE confirmed AND"
     154             :            "       NOT (failed OR verified)"
     155             :            " ORDER BY ready_time ASC"
     156             :            " LIMIT $1;");
     157             : 
     158          10 :   qs = GNUNET_PQ_eval_prepared_multi_select (
     159             :     pg->conn,
     160             :     "select_open_transfers",
     161             :     params,
     162             :     &open_transfers_cb,
     163             :     &plc);
     164          10 :   if (0 != plc.qs)
     165           0 :     return plc.qs;
     166          10 :   return qs;
     167             : }