merchant

Merchant backend to process payments, run by merchants
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pg_lookup_spent_tokens_by_order.c (5052B)

      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 backenddb/pg_lookup_spent_tokens_by_order.c
     18  * @brief Implementation of the lookup_spent_tokens_by_order function for Postgres
     19  * @author Christian Blättler
     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_spent_tokens_by_order.h"
     26 #include "pg_helper.h"
     27 #include "taler_merchantdb_plugin.h"
     28 
     29 /**
     30  * Closure for lookup_spent_tokens_by_order_cb().
     31  */
     32 struct LookupSpentTokensByOrderContext
     33 {
     34 
     35   /**
     36    * Plugin context.
     37    */
     38   struct PostgresClosure *pg;
     39 
     40   /**
     41    * Function to call with all results.
     42    */
     43   TALER_MERCHANTDB_UsedTokensCallback cb;
     44 
     45   /**
     46    * Closure for @e cb.
     47    */
     48   void *cb_cls;
     49 
     50   /**
     51    * Set to the query result.
     52    */
     53   enum GNUNET_DB_QueryStatus qs;
     54 };
     55 
     56 
     57 /**
     58  * Function to be called with the results of a SELECT statement
     59  * that has returned @a num_results results.
     60  *
     61  * @param cls of type `struct LookupSpentTokensByOrderContext *`
     62  * @param result the postgres result
     63  * @param num_results the number of results in @a result
     64  */
     65 static void
     66 lookup_spent_tokens_by_order_cb (void *cls,
     67                                  PGresult *result,
     68                                  unsigned int num_results)
     69 {
     70   struct LookupSpentTokensByOrderContext *ctx = cls;
     71 
     72   for (unsigned int i = 0; i<num_results; i++)
     73   {
     74     uint64_t spent_token_serial;
     75     struct TALER_PrivateContractHashP h_contract_terms;
     76     struct TALER_TokenIssuePublicKeyHashP h_issue_pub;
     77     struct TALER_TokenUsePublicKeyP use_pub;
     78     struct TALER_TokenUseSignatureP use_sig;
     79     struct TALER_TokenIssueSignature issue_sig;
     80     struct GNUNET_PQ_ResultSpec rs[] = {
     81       GNUNET_PQ_result_spec_uint64 ("spent_token_serial",
     82                                     &spent_token_serial),
     83       GNUNET_PQ_result_spec_auto_from_type ("h_contract_terms",
     84                                             &h_contract_terms),
     85       GNUNET_PQ_result_spec_auto_from_type ("h_pub",
     86                                             &h_issue_pub),
     87       GNUNET_PQ_result_spec_auto_from_type ("token_pub",
     88                                             &use_pub),
     89       GNUNET_PQ_result_spec_auto_from_type ("token_sig",
     90                                             &use_sig),
     91       GNUNET_PQ_result_spec_unblinded_sig ("blind_sig",
     92                                            &issue_sig.signature),
     93       GNUNET_PQ_result_spec_end
     94     };
     95 
     96     if (GNUNET_OK !=
     97         GNUNET_PQ_extract_result (result,
     98                                   rs,
     99                                   i))
    100     {
    101       GNUNET_break (0);
    102       ctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
    103       return;
    104     }
    105     ctx->cb (ctx->cb_cls,
    106              spent_token_serial,
    107              &h_contract_terms,
    108              &h_issue_pub,
    109              &use_pub,
    110              &use_sig,
    111              &issue_sig);
    112     GNUNET_PQ_cleanup_result (rs);
    113   }
    114   ctx->qs = num_results;
    115 }
    116 
    117 
    118 enum GNUNET_DB_QueryStatus
    119 TMH_PG_lookup_spent_tokens_by_order (void *cls,
    120                                      uint64_t order_serial,
    121                                      TALER_MERCHANTDB_UsedTokensCallback cb,
    122                                      void *cb_cls)
    123 {
    124   struct PostgresClosure *pg = cls;
    125   struct LookupSpentTokensByOrderContext ctx = {
    126     .pg = pg,
    127     .cb = cb,
    128     .cb_cls = cb_cls
    129   };
    130   struct GNUNET_PQ_QueryParam params[] = {
    131     GNUNET_PQ_query_param_uint64 (&order_serial),
    132     GNUNET_PQ_query_param_end
    133   };
    134   enum GNUNET_DB_QueryStatus qs;
    135 
    136   check_connection (pg);
    137   PREPARE (pg,
    138            "lookup_spent_tokens_by_order",
    139            "SELECT"
    140            " spent_token_serial"
    141            ",h_contract_terms"
    142            ",h_pub"
    143            ",token_pub"
    144            ",token_sig"
    145            ",blind_sig"
    146            " FROM merchant_used_tokens"
    147            " JOIN merchant_contract_terms"
    148            "   USING (h_contract_terms)"
    149            " JOIN merchant_token_family_keys"
    150            "   USING (token_family_key_serial)"
    151            " WHERE order_serial=$1");
    152 
    153   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    154                                              "lookup_spent_tokens_by_order",
    155                                              params,
    156                                              &lookup_spent_tokens_by_order_cb,
    157                                              &ctx);
    158 
    159   if (qs < 0)
    160     return qs;
    161   return ctx.qs;
    162 }