merchant

Merchant backend to process payments, run by merchants
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lookup_statistics_counter_by_bucket.c (5210B)

      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 src/backenddb/lookup_statistics_counter_by_bucket.c
     18  * @brief Implementation of the lookup_statistics_counter_by_bucket function for Postgres
     19  * @author Martin Schanzenbach
     20  */
     21 #include "platform.h"
     22 #include <taler/taler_pq_lib.h>
     23 #include "merchant-database/lookup_statistics_counter_by_bucket.h"
     24 #include "helper.h"
     25 #include "merchantdb_lib.h"
     26 
     27 
     28 /**
     29  * Context used for TALER_MERCHANTDB_lookup_statistics_counter_by_bucket().
     30  */
     31 struct LookupCounterStatisticsContext
     32 {
     33   /**
     34    * Function to call with the results.
     35    */
     36   TALER_MERCHANTDB_CounterByBucketStatisticsCallback cb;
     37 
     38   /**
     39    * Closure for @a cb.
     40    */
     41   void *cb_cls;
     42 
     43   /**
     44    * Did database result extraction fail?
     45    */
     46   bool extract_failed;
     47 };
     48 
     49 
     50 /**
     51  * Function to be called with the results of a SELECT statement
     52  * that has returned @a num_results results about token families.
     53  *
     54  * @param[in,out] cls of type `struct LookupCounterStatisticsContext *`
     55  * @param result the postgres result
     56  * @param num_results the number of results in @a result
     57  */
     58 static void
     59 lookup_statistics_counter_by_bucket_cb (void *cls,
     60                                         PGresult *result,
     61                                         unsigned int num_results)
     62 {
     63   struct LookupCounterStatisticsContext *tflc = cls;
     64 
     65   for (unsigned int i = 0; i < num_results; i++)
     66   {
     67     char *description;
     68     char *bucket_range;
     69     uint64_t cumulative_number;
     70     uint64_t bucket_start_epoch;
     71     uint64_t bucket_end_epoch;
     72     struct GNUNET_PQ_ResultSpec rs[] = {
     73       GNUNET_PQ_result_spec_string ("description",
     74                                     &description),
     75       GNUNET_PQ_result_spec_uint64 ("bucket_start",
     76                                     &bucket_start_epoch),
     77       GNUNET_PQ_result_spec_uint64 ("bucket_end",
     78                                     &bucket_end_epoch),
     79       GNUNET_PQ_result_spec_string ("bucket_range",
     80                                     &bucket_range),
     81       GNUNET_PQ_result_spec_uint64 ("cumulative_number",
     82                                     &cumulative_number),
     83       GNUNET_PQ_result_spec_end
     84     };
     85     struct GNUNET_TIME_Timestamp bucket_start;
     86     struct GNUNET_TIME_Timestamp bucket_end;
     87 
     88     if (GNUNET_OK !=
     89         GNUNET_PQ_extract_result (result,
     90                                   rs,
     91                                   i))
     92     {
     93       GNUNET_break (0);
     94       tflc->extract_failed = true;
     95       return;
     96     }
     97 
     98     bucket_start = GNUNET_TIME_timestamp_from_s (bucket_start_epoch);
     99     bucket_end = GNUNET_TIME_timestamp_from_s (bucket_end_epoch);
    100     tflc->cb (tflc->cb_cls,
    101               description,
    102               bucket_start,
    103               bucket_end,
    104               bucket_range,
    105               cumulative_number);
    106     GNUNET_PQ_cleanup_result (rs);
    107   }
    108 }
    109 
    110 
    111 enum GNUNET_DB_QueryStatus
    112 TALER_MERCHANTDB_lookup_statistics_counter_by_bucket (
    113   struct TALER_MERCHANTDB_PostgresContext *pg,
    114   const char *instance_id,
    115   const char *slug,
    116   TALER_MERCHANTDB_CounterByBucketStatisticsCallback cb,
    117   void *cb_cls)
    118 {
    119   struct LookupCounterStatisticsContext context = {
    120     .cb = cb,
    121     .cb_cls = cb_cls,
    122     /* Can be overwritten by the lookup_statistics_counter_by_bucket_cb */
    123     .extract_failed = false,
    124   };
    125   struct GNUNET_PQ_QueryParam params[] = {
    126     GNUNET_PQ_query_param_string (slug),
    127     GNUNET_PQ_query_param_end
    128   };
    129   enum GNUNET_DB_QueryStatus qs;
    130 
    131   GNUNET_assert (NULL != pg->current_merchant_id);
    132   GNUNET_assert (0 == strcmp (instance_id,
    133                               pg->current_merchant_id));
    134   check_connection (pg);
    135   TMH_PQ_prepare_anon (pg,
    136                        "SELECT"
    137                        " description"
    138                        ",bucket_start"
    139                        ",bucket_range::TEXT"
    140                        ",merchant_statistics_bucket_end(bucket_start, bucket_range) AS bucket_end"
    141                        ",cumulative_number"
    142                        " FROM merchant_statistic_bucket_counter"
    143                        " JOIN merchant_statistic_bucket_meta"
    144                        "   USING (bmeta_serial_id)"
    145                        " WHERE merchant_statistic_bucket_meta.slug=$1"
    146                        " AND merchant_statistic_bucket_meta.stype = 'number'");
    147   qs = GNUNET_PQ_eval_prepared_multi_select (
    148     pg->conn,
    149     "",
    150     params,
    151     &lookup_statistics_counter_by_bucket_cb,
    152     &context);
    153   /* If there was an error inside the cb, return a hard error. */
    154   if (context.extract_failed)
    155   {
    156     GNUNET_break (0);
    157     return GNUNET_DB_STATUS_HARD_ERROR;
    158   }
    159   return qs;
    160 }