Line data    Source code

       1             : /*
       2             :    This file is part of TALER
       3             :    Copyright (C) 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_lookup_statistics_counter_by_interval.c
      18             :  * @brief Implementation of the lookup_statistics_counter_by_interval function for Postgres
      19             :  * @author Martin Schanzenbach
      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_statistics_counter_by_interval.h"
      26             : #include "pg_helper.h"
      27             : #include "taler_merchantdb_plugin.h"
      28             : 
      29             : 
      30             : /**
      31             :  * Context used for TMH_PG_lookup_statistics_counter().
      32             :  */
      33             : struct LookupCounterStatisticsContext
      34             : {
      35             :   /**
      36             :    * Function to call with the results.
      37             :    */
      38             :   TALER_MERCHANTDB_CounterByIntervalStatisticsCallback cb;
      39             : 
      40             :   /**
      41             :    * Closure for @a cb.
      42             :    */
      43             :   void *cb_cls;
      44             : 
      45             :   /**
      46             :    * Did database result extraction fail?
      47             :    */
      48             :   bool extract_failed;
      49             : };
      50             : 
      51             : 
      52             : /**
      53             :  * Function to be called with the results of a SELECT statement
      54             :  * that has returned @a num_results results about token families.
      55             :  *
      56             :  * @param[in,out] cls of type `struct LookupTokenFamiliesContext *`
      57             :  * @param result the postgres result
      58             :  * @param num_results the number of results in @a result
      59             :  */
      60             : static void
      61           4 : lookup_statistics_counter_by_interval_cb (void *cls,
      62             :                                           PGresult *result,
      63             :                                           unsigned int num_results)
      64             : {
      65           4 :   struct LookupCounterStatisticsContext *tflc = cls;
      66             : 
      67           4 :   for (unsigned int i = 0; i < num_results; i++)
      68             :   {
      69             :     char *description;
      70             :     uint64_t cumulative_number;
      71             :     uint64_t interval_start_epoch;
      72           0 :     struct GNUNET_PQ_ResultSpec rs[] = {
      73           0 :       GNUNET_PQ_result_spec_string ("description",
      74             :                                     &description),
      75           0 :       GNUNET_PQ_result_spec_uint64 ("start_time",
      76             :                                     &interval_start_epoch),
      77           0 :       GNUNET_PQ_result_spec_uint64 ("cumulative_number",
      78             :                                     &cumulative_number),
      79             :       GNUNET_PQ_result_spec_end
      80             :     };
      81             :     struct GNUNET_TIME_Timestamp interval_start;
      82             : 
      83           0 :     if (GNUNET_OK !=
      84           0 :         GNUNET_PQ_extract_result (result,
      85             :                                   rs,
      86             :                                   i))
      87             :     {
      88           0 :       GNUNET_break (0);
      89           0 :       tflc->extract_failed = true;
      90           0 :       return;
      91             :     }
      92             : 
      93           0 :     interval_start = GNUNET_TIME_timestamp_from_s (interval_start_epoch);
      94           0 :     tflc->cb (tflc->cb_cls,
      95             :               description,
      96             :               interval_start,
      97             :               cumulative_number);
      98           0 :     GNUNET_PQ_cleanup_result (rs);
      99             :   }
     100             : }
     101             : 
     102             : 
     103             : enum GNUNET_DB_QueryStatus
     104           4 : TMH_PG_lookup_statistics_counter_by_interval (
     105             :   void *cls,
     106             :   const char *instance_id,
     107             :   const char *slug,
     108             :   TALER_MERCHANTDB_CounterByIntervalStatisticsCallback cb,
     109             :   void *cb_cls)
     110             : {
     111           4 :   struct PostgresClosure *pg = cls;
     112           4 :   struct LookupCounterStatisticsContext context = {
     113             :     .cb = cb,
     114             :     .cb_cls = cb_cls,
     115             :     /* Can be overwritten by the lookup_token_families_cb */
     116             :     .extract_failed = false,
     117             :   };
     118           4 :   struct GNUNET_PQ_QueryParam params[] = {
     119           4 :     GNUNET_PQ_query_param_string (instance_id),
     120           4 :     GNUNET_PQ_query_param_string (slug),
     121             :     GNUNET_PQ_query_param_end
     122             :   };
     123             :   enum GNUNET_DB_QueryStatus qs;
     124             : 
     125           4 :   check_connection (pg);
     126           4 :   PREPARE (pg,
     127             :            "lookup_statistics_counter_by_interval",
     128             :            "SELECT *"
     129             :            " FROM merchant_statistic_interval_number_get($1,$2)"
     130             :            " JOIN merchant_statistic_bucket_meta"
     131             :            " ON slug=$2");
     132           4 :   qs = GNUNET_PQ_eval_prepared_multi_select (
     133             :     pg->conn,
     134             :     "lookup_statistics_counter_by_interval",
     135             :     params,
     136             :     &lookup_statistics_counter_by_interval_cb,
     137             :     &context);
     138             :   /* If there was an error inside the cb, return a hard error. */
     139           4 :   if (context.extract_failed)
     140             :   {
     141           0 :     GNUNET_break (0);
     142           0 :     return GNUNET_DB_STATUS_HARD_ERROR;
     143             :   }
     144           4 :   return qs;
     145             : }