merchant

Merchant backend to process payments, run by merchants
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pg_lookup_statistics_counter_by_bucket.c (5243B)

      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_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_error_codes.h>
     23 #include <taler/taler_dbevents.h>
     24 #include <taler/taler_pq_lib.h>
     25 #include "pg_lookup_statistics_counter_by_bucket.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_CounterByBucketStatisticsCallback 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 lookup_statistics_counter_by_bucket_cb (void *cls,
     62                                         PGresult *result,
     63                                         unsigned int num_results)
     64 {
     65   struct LookupCounterStatisticsContext *tflc = cls;
     66 
     67   for (unsigned int i = 0; i < num_results; i++)
     68   {
     69     char *description;
     70     char *bucket_range;
     71     uint64_t cumulative_number;
     72     uint64_t bucket_start_epoch;
     73     uint64_t bucket_end_epoch;
     74     struct GNUNET_PQ_ResultSpec rs[] = {
     75       GNUNET_PQ_result_spec_string ("description",
     76                                     &description),
     77       GNUNET_PQ_result_spec_uint64 ("bucket_start",
     78                                     &bucket_start_epoch),
     79       GNUNET_PQ_result_spec_uint64 ("bucket_end",
     80                                     &bucket_end_epoch),
     81       GNUNET_PQ_result_spec_string ("bucket_range",
     82                                     &bucket_range),
     83       GNUNET_PQ_result_spec_uint64 ("cumulative_number",
     84                                     &cumulative_number),
     85       GNUNET_PQ_result_spec_end
     86     };
     87     struct GNUNET_TIME_Timestamp bucket_start;
     88     struct GNUNET_TIME_Timestamp bucket_end;
     89 
     90     if (GNUNET_OK !=
     91         GNUNET_PQ_extract_result (result,
     92                                   rs,
     93                                   i))
     94     {
     95       GNUNET_break (0);
     96       tflc->extract_failed = true;
     97       return;
     98     }
     99 
    100     bucket_start = GNUNET_TIME_timestamp_from_s (bucket_start_epoch);
    101     bucket_end = GNUNET_TIME_timestamp_from_s (bucket_end_epoch);
    102     tflc->cb (tflc->cb_cls,
    103               description,
    104               bucket_start,
    105               bucket_end,
    106               bucket_range,
    107               cumulative_number);
    108     GNUNET_PQ_cleanup_result (rs);
    109   }
    110 }
    111 
    112 
    113 enum GNUNET_DB_QueryStatus
    114 TMH_PG_lookup_statistics_counter_by_bucket (
    115   void *cls,
    116   const char *instance_id,
    117   const char *slug,
    118   TALER_MERCHANTDB_CounterByBucketStatisticsCallback cb,
    119   void *cb_cls)
    120 {
    121   struct PostgresClosure *pg = cls;
    122   struct LookupCounterStatisticsContext context = {
    123     .cb = cb,
    124     .cb_cls = cb_cls,
    125     /* Can be overwritten by the lookup_statistics_counter_by_bucket_cb */
    126     .extract_failed = false,
    127   };
    128   struct GNUNET_PQ_QueryParam params[] = {
    129     GNUNET_PQ_query_param_string (instance_id),
    130     GNUNET_PQ_query_param_string (slug),
    131     GNUNET_PQ_query_param_end
    132   };
    133   enum GNUNET_DB_QueryStatus qs;
    134 
    135   check_connection (pg);
    136   PREPARE (pg,
    137            "lookup_statistics_counter_by_bucket",
    138            "SELECT"
    139            " description"
    140            ",bucket_start"
    141            ",bucket_range::TEXT"
    142            ",merchant_statistics_bucket_end(bucket_start, bucket_range) AS bucket_end"
    143            ",cumulative_number"
    144            " FROM merchant_statistic_bucket_counter"
    145            " JOIN merchant_statistic_bucket_meta"
    146            "   USING (bmeta_serial_id)"
    147            " JOIN merchant_instances"
    148            "   USING (merchant_serial)"
    149            " WHERE merchant_instances.merchant_id=$1"
    150            " AND "
    151            " merchant_statistic_bucket_meta.slug=$2"
    152            " AND "
    153            " merchant_statistic_bucket_meta.stype = 'number'");
    154   qs = GNUNET_PQ_eval_prepared_multi_select (
    155     pg->conn,
    156     "lookup_statistics_counter_by_bucket",
    157     params,
    158     &lookup_statistics_counter_by_bucket_cb,
    159     &context);
    160   /* If there was an error inside the cb, return a hard error. */
    161   if (context.extract_failed)
    162   {
    163     GNUNET_break (0);
    164     return GNUNET_DB_STATUS_HARD_ERROR;
    165   }
    166   return qs;
    167 }