merchant

Merchant backend to process payments, run by merchants
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pg_lookup_otp_devices.c (3964B)

      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_lookup_otp_devices.c
     18  * @brief Implementation of the lookup_otp_devices 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_lookup_otp_devices.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Context used for TMH_PG_lookup_otp_devices().
     31  */
     32 struct LookupOtpDeviceContext
     33 {
     34   /**
     35    * Function to call with the results.
     36    */
     37   TALER_MERCHANTDB_OtpDeviceCallback cb;
     38 
     39   /**
     40    * Closure for @a cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Did database result extraction fail?
     46    */
     47   bool extract_failed;
     48 };
     49 
     50 
     51 /**
     52  * Function to be called with the results of a SELECT statement
     53  * that has returned @a num_results results about otp_device.
     54  *
     55  * @param[in,out] cls of type `struct LookupOtpDeviceContext *`
     56  * @param result the postgres result
     57  * @param num_results the number of results in @a result
     58  */
     59 static void
     60 lookup_otp_devices_cb (void *cls,
     61                        PGresult *result,
     62                        unsigned int num_results)
     63 {
     64   struct LookupOtpDeviceContext *tlc = cls;
     65 
     66   for (unsigned int i = 0; i < num_results; i++)
     67   {
     68     char *otp_device_id;
     69     char *otp_device_description;
     70     struct GNUNET_PQ_ResultSpec rs[] = {
     71       GNUNET_PQ_result_spec_string ("otp_id",
     72                                     &otp_device_id),
     73       GNUNET_PQ_result_spec_string ("otp_description",
     74                                     &otp_device_description),
     75       GNUNET_PQ_result_spec_end
     76     };
     77 
     78     if (GNUNET_OK !=
     79         GNUNET_PQ_extract_result (result,
     80                                   rs,
     81                                   i))
     82     {
     83       GNUNET_break (0);
     84       tlc->extract_failed = true;
     85       return;
     86     }
     87     tlc->cb (tlc->cb_cls,
     88              otp_device_id,
     89              otp_device_description);
     90     GNUNET_PQ_cleanup_result (rs);
     91   }
     92 }
     93 
     94 
     95 enum GNUNET_DB_QueryStatus
     96 TMH_PG_lookup_otp_devices (void *cls,
     97                            const char *instance_id,
     98                            TALER_MERCHANTDB_OtpDeviceCallback cb,
     99                            void *cb_cls)
    100 {
    101   struct PostgresClosure *pg = cls;
    102   struct LookupOtpDeviceContext tlc = {
    103     .cb = cb,
    104     .cb_cls = cb_cls,
    105     /* Can be overwritten by the lookup_otp_device_cb */
    106     .extract_failed = false,
    107   };
    108   struct GNUNET_PQ_QueryParam params[] = {
    109     GNUNET_PQ_query_param_string (instance_id),
    110     GNUNET_PQ_query_param_end
    111   };
    112   enum GNUNET_DB_QueryStatus qs;
    113 
    114   check_connection (pg);
    115   PREPARE (pg,
    116            "lookup_otp_devices",
    117            "SELECT"
    118            " otp_id"
    119            ",otp_description"
    120            " FROM merchant_otp_devices"
    121            " JOIN merchant_instances"
    122            "   USING (merchant_serial)"
    123            " WHERE merchant_instances.merchant_id=$1");
    124   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    125                                              "lookup_otp_devices",
    126                                              params,
    127                                              &lookup_otp_devices_cb,
    128                                              &tlc);
    129   /* If there was an error inside lookup_otp_device_cb, return a hard error. */
    130   if (tlc.extract_failed)
    131     return GNUNET_DB_STATUS_HARD_ERROR;
    132   return qs;
    133 }