merchant

Merchant backend to process payments, run by merchants
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lookup_statistics_amount_by_bucket2.c (5279B)

      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_amount_by_bucket2.c
     18  * @brief Implementation of the lookup_statistics_amount_by_bucket2 function for Postgres
     19  * @author Christian Grothoff
     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 "merchant-database/lookup_statistics_amount_by_bucket2.h"
     26 #include "helper.h"
     27 
     28 
     29 /**
     30  * Context used for TALER_MERCHANTDB_lookup_statistics_amount_by_bucket2().
     31  */
     32 struct LookupAmountStatisticsContext2
     33 {
     34   /**
     35    * Function to call with the results.
     36    */
     37   TALER_MERCHANTDB_AmountByBucketStatisticsCallback2 cb;
     38 
     39   /**
     40    * Closure for @a cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Did database result extraction fail?
     46    */
     47   bool extract_failed;
     48 
     49   /**
     50    * Postgres context for array lookups
     51    */
     52   struct TALER_MERCHANTDB_PostgresContext *pg;
     53 };
     54 
     55 
     56 /**
     57  * Function to be called with the results of a SELECT statement
     58  * that has returned @a num_results results about token families.
     59  *
     60  * @param[in,out] cls of type `struct LookupAmountStatisticsContext2 *`
     61  * @param result the postgres result
     62  * @param num_results the number of results in @a result
     63  */
     64 static void
     65 lookup_statistics_amount_by_bucket_cb2 (void *cls,
     66                                         PGresult *result,
     67                                         unsigned int num_results)
     68 {
     69   struct LookupAmountStatisticsContext2 *tflc = cls;
     70   struct TALER_MERCHANTDB_PostgresContext *pg = tflc->pg;
     71 
     72   for (unsigned int i = 0; i < num_results; i++)
     73   {
     74     struct TALER_Amount *amounts;
     75     size_t num_amounts;
     76     uint64_t bucket_start_epoch;
     77     struct GNUNET_PQ_ResultSpec rs[] = {
     78       GNUNET_PQ_result_spec_uint64 ("bucket_start",
     79                                     &bucket_start_epoch),
     80       TALER_PQ_result_spec_array_amount_with_currency (pg->conn,
     81                                                        "cumulative_amounts",
     82                                                        &num_amounts,
     83                                                        &amounts),
     84       GNUNET_PQ_result_spec_end
     85     };
     86     struct GNUNET_TIME_Timestamp bucket_start;
     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     tflc->cb (tflc->cb_cls,
    100               bucket_start,
    101               num_amounts,
    102               amounts);
    103     GNUNET_PQ_cleanup_result (rs);
    104   }
    105 }
    106 
    107 
    108 enum GNUNET_DB_QueryStatus
    109 TALER_MERCHANTDB_lookup_statistics_amount_by_bucket2 (
    110   struct TALER_MERCHANTDB_PostgresContext *pg,
    111   const char *instance_id,
    112   const char *slug,
    113   const char *granularity,
    114   uint64_t counter,
    115   TALER_MERCHANTDB_AmountByBucketStatisticsCallback2 cb,
    116   void *cb_cls)
    117 {
    118   struct LookupAmountStatisticsContext2 context = {
    119     .cb = cb,
    120     .cb_cls = cb_cls,
    121     /* Can be overwritten by the lookup_statistics_amount_by_bucket_cb2 */
    122     .extract_failed = false,
    123     .pg = pg,
    124   };
    125   struct GNUNET_PQ_QueryParam params[] = {
    126     GNUNET_PQ_query_param_string (instance_id),
    127     GNUNET_PQ_query_param_string (slug),
    128     GNUNET_PQ_query_param_string (granularity),
    129     GNUNET_PQ_query_param_uint64 (&counter),
    130     GNUNET_PQ_query_param_end
    131   };
    132   enum GNUNET_DB_QueryStatus qs;
    133 
    134   check_connection (pg);
    135   PREPARE (pg,
    136            "lookup_statistics_amount_by_bucket2",
    137            "SELECT"
    138            " msba.bucket_start"
    139            ",ARRAY_AGG ("
    140            "   ROW(msba.cumulative_value::INT8, msba.cumulative_frac::INT4, msba.curr)::taler_amount_currency"
    141            " ) AS cumulative_amounts"
    142            " FROM merchant_statistic_bucket_meta msbm"
    143            " JOIN merchant_statistic_bucket_amount msba"
    144            "   USING (bmeta_serial_id)"
    145            " JOIN merchant_instances mi"
    146            "   USING (merchant_serial)"
    147            " WHERE mi.merchant_id=$1"
    148            "   AND msbm.slug=$2"
    149            "   AND msba.bucket_range=$3::TEXT::statistic_range"
    150            "   AND msbm.stype='amount'"
    151            " GROUP BY msba.bucket_start"
    152            " ORDER BY msba.bucket_start DESC"
    153            " LIMIT $4;");
    154   qs = GNUNET_PQ_eval_prepared_multi_select (
    155     pg->conn,
    156     "lookup_statistics_amount_by_bucket2",
    157     params,
    158     &lookup_statistics_amount_by_bucket_cb2,
    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 }