lookup_statistics_counter_by_interval.h (2589B)
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/include/merchant-database/lookup_statistics_counter_by_interval.h 18 * @brief implementation of the lookup_statistics_by_interval function for Postgres 19 * @author Martin Schanzenbach 20 */ 21 #ifndef MERCHANT_DATABASE_LOOKUP_STATISTICS_COUNTER_BY_INTERVAL_H 22 #define MERCHANT_DATABASE_LOOKUP_STATISTICS_COUNTER_BY_INTERVAL_H 23 24 #include <taler/taler_util.h> 25 #include <taler/taler_json_lib.h> 26 #include "merchantdb_lib.h" 27 28 29 /** 30 * Details about a statistic with counter. 31 */ 32 struct TALER_MERCHANTDB_StatisticsCounterByIntervalDetails 33 { 34 /** 35 * Start time of the interval. 36 * The interval always ends at the response generation time. 37 */ 38 struct GNUNET_TIME_Timestamp start_time; 39 40 /** 41 * Sum of all counters falling under the given 42 * SLUG within this timeframe 43 */ 44 uint64_t cumulative_counter; 45 }; 46 47 48 /** 49 * Function returning integer-valued statistics for a time interval. 50 * Called by `lookup_statistics_counter_by_interval`. 51 * 52 * @param cls closure 53 * @param description description of the statistic 54 * @param interval_start start time of the interval 55 * @param cumulative_counter counter value 56 */ 57 typedef void 58 (*TALER_MERCHANTDB_CounterByIntervalStatisticsCallback)( 59 void *cls, 60 const char *description, 61 struct GNUNET_TIME_Timestamp interval_start, 62 uint64_t cumulative_counter); 63 64 /** 65 * Lookup statistics where the values are counters. 66 * 67 * @param pg database context 68 * @param instance_id instance to lookup statistics for 69 * @param slug slug to lookup statistics for 70 * @param cb function to call on all statistics found 71 * @param cb_cls closure for @a cb 72 * @return database result code 73 */ 74 enum GNUNET_DB_QueryStatus 75 TALER_MERCHANTDB_lookup_statistics_counter_by_interval ( 76 struct TALER_MERCHANTDB_PostgresContext *pg, 77 const char *instance_id, 78 const char *slug, 79 TALER_MERCHANTDB_CounterByIntervalStatisticsCallback cb, 80 void *cb_cls); 81 82 #endif