Line data    Source code

       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 pg_helper.c
      18             :  * @brief shared internal definitions for postgres DB plugin
      19             :  * @author Christian Grothoff
      20             :  */
      21             : #include "platform.h"
      22             : #include "pg_helper.h"
      23             : #include <gnunet/gnunet_util_lib.h>
      24             : #include <gnunet/gnunet_pq_lib.h>
      25             : #include <taler/taler_util.h>
      26             : #include <taler/taler_pq_lib.h>
      27             : #include <taler/taler_json_lib.h>
      28             : #include <taler/taler_mhd_lib.h>
      29             : 
      30             : 
      31             : enum GNUNET_GenericReturnValue
      32         380 : TMH_PG_start (void *cls,
      33             :               const char *name)
      34             : {
      35         380 :   struct PostgresClosure *pg = cls;
      36         380 :   struct GNUNET_PQ_ExecuteStatement es[] = {
      37         380 :     GNUNET_PQ_make_execute ("START TRANSACTION ISOLATION LEVEL SERIALIZABLE"),
      38             :     GNUNET_PQ_EXECUTE_STATEMENT_END
      39             :   };
      40             : 
      41         380 :   GNUNET_assert (NULL != name);
      42         380 :   check_connection (pg);
      43         380 :   postgres_preflight (pg);
      44         380 :   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      45             :               "Starting merchant DB transaction `%s'\n",
      46             :               name);
      47         380 :   if (GNUNET_OK !=
      48         380 :       GNUNET_PQ_exec_statements (pg->conn,
      49             :                                  es))
      50             :   {
      51           0 :     TALER_LOG_ERROR ("Failed to start transaction\n");
      52           0 :     GNUNET_break (0);
      53           0 :     return GNUNET_SYSERR;
      54             :   }
      55         380 :   pg->transaction_name = name;
      56         380 :   return GNUNET_OK;
      57             : }
      58             : 
      59             : 
      60             : enum GNUNET_GenericReturnValue
      61           0 : TMH_PG_start_read_committed (void *cls,
      62             :                              const char *name)
      63             : {
      64           0 :   struct PostgresClosure *pg = cls;
      65           0 :   struct GNUNET_PQ_ExecuteStatement es[] = {
      66           0 :     GNUNET_PQ_make_execute ("START TRANSACTION ISOLATION LEVEL READ COMMITTED"),
      67             :     GNUNET_PQ_EXECUTE_STATEMENT_END
      68             :   };
      69             : 
      70           0 :   GNUNET_assert (NULL != name);
      71           0 :   check_connection (pg);
      72           0 :   postgres_preflight (pg);
      73           0 :   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      74             :               "Starting merchant DB transaction %s (READ COMMITTED)\n",
      75             :               name);
      76           0 :   if (GNUNET_OK !=
      77           0 :       GNUNET_PQ_exec_statements (pg->conn,
      78             :                                  es))
      79             :   {
      80           0 :     TALER_LOG_ERROR ("Failed to start transaction\n");
      81           0 :     GNUNET_break (0);
      82           0 :     return GNUNET_SYSERR;
      83             :   }
      84           0 :   pg->transaction_name = name;
      85           0 :   return GNUNET_OK;
      86             : }
      87             : 
      88             : 
      89             : void
      90         103 : TMH_PG_rollback (void *cls)
      91             : {
      92         103 :   struct PostgresClosure *pg = cls;
      93         103 :   struct GNUNET_PQ_ExecuteStatement es[] = {
      94         103 :     GNUNET_PQ_make_execute ("ROLLBACK"),
      95             :     GNUNET_PQ_EXECUTE_STATEMENT_END
      96             :   };
      97             : 
      98         103 :   if (NULL == pg->transaction_name)
      99          27 :     return;
     100          76 :   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
     101             :               "Rolling back merchant DB transaction `%s'\n",
     102             :               pg->transaction_name);
     103          76 :   GNUNET_break (GNUNET_OK ==
     104             :                 GNUNET_PQ_exec_statements (pg->conn,
     105             :                                            es));
     106          76 :   pg->transaction_name = NULL;
     107             : }
     108             : 
     109             : 
     110             : enum GNUNET_DB_QueryStatus
     111         304 : TMH_PG_commit (void *cls)
     112             : {
     113         304 :   struct PostgresClosure *pg = cls;
     114         304 :   struct GNUNET_PQ_QueryParam params[] = {
     115             :     GNUNET_PQ_query_param_end
     116             :   };
     117             :   enum GNUNET_DB_QueryStatus qs;
     118             : 
     119         304 :   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
     120             :               "Committing merchant DB transaction %s\n",
     121             :               pg->transaction_name);
     122         304 :   check_connection (pg);
     123         304 :   PREPARE (pg,
     124             :            "merchant_commit",
     125             :            "COMMIT");
     126         304 :   qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
     127             :                                            "merchant_commit",
     128             :                                            params);
     129         304 :   if (qs < 0)
     130             :   {
     131           0 :     GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
     132             :                 "Failed to commit transaction\n");
     133           0 :     TMH_PG_rollback (pg);
     134           0 :     return qs;
     135             :   }
     136         304 :   pg->transaction_name = NULL;
     137         304 :   return qs;
     138             : }