pg_lookup_statistics_counter_by_interval.c (6189B)
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 * Description of statistic 52 */ 53 char*description; 54 }; 55 56 /** 57 * Function to be called with the results of a SELECT statement 58 * that has returned @a num_results results about statistics. 59 * 60 * @param[in,out] cls of type `struct LookupTokenFamiliesContext *` 61 * @param result the postgres result 62 * @param num_results the number of results in @a result 63 */ 64 static void 65 lookup_statistics_counter_by_interval_desc_cb (void *cls, 66 PGresult *result, 67 unsigned int num_results) 68 { 69 struct LookupCounterStatisticsContext *tflc = cls; 70 71 for (unsigned int i = 0; i < num_results; i++) 72 { 73 char *description; 74 struct GNUNET_PQ_ResultSpec rs[] = { 75 GNUNET_PQ_result_spec_string ("description", 76 &description), 77 GNUNET_PQ_result_spec_end 78 }; 79 80 if (GNUNET_OK != 81 GNUNET_PQ_extract_result (result, 82 rs, 83 i)) 84 { 85 GNUNET_break (0); 86 tflc->extract_failed = true; 87 return; 88 } 89 90 tflc->description = GNUNET_strdup (description); 91 92 GNUNET_PQ_cleanup_result (rs); 93 } 94 } 95 96 97 /** 98 * Function to be called with the results of a SELECT statement 99 * that has returned @a num_results results about statistics. 100 * 101 * @param[in,out] cls of type `struct LookupTokenFamiliesContext *` 102 * @param result the postgres result 103 * @param num_results the number of results in @a result 104 */ 105 static void 106 lookup_statistics_counter_by_interval_cb (void *cls, 107 PGresult *result, 108 unsigned int num_results) 109 { 110 struct LookupCounterStatisticsContext *tflc = cls; 111 112 for (unsigned int i = 0; i < num_results; i++) 113 { 114 uint64_t cumulative_number; 115 uint64_t interval_start_ago; 116 struct GNUNET_PQ_ResultSpec rs[] = { 117 GNUNET_PQ_result_spec_uint64 ("range", 118 &interval_start_ago), 119 GNUNET_PQ_result_spec_uint64 ("rvalue", 120 &cumulative_number), 121 GNUNET_PQ_result_spec_end 122 }; 123 struct GNUNET_TIME_Timestamp interval_start; 124 125 if (GNUNET_OK != 126 GNUNET_PQ_extract_result (result, 127 rs, 128 i)) 129 { 130 GNUNET_break (0); 131 tflc->extract_failed = true; 132 return; 133 } 134 135 interval_start = GNUNET_TIME_timestamp_get (); 136 interval_start.abs_time.abs_value_us -= interval_start_ago * 1000 * 1000; 137 tflc->cb (tflc->cb_cls, 138 tflc->description, 139 interval_start, 140 cumulative_number); 141 GNUNET_PQ_cleanup_result (rs); 142 } 143 } 144 145 146 enum GNUNET_DB_QueryStatus 147 TMH_PG_lookup_statistics_counter_by_interval ( 148 void *cls, 149 const char *instance_id, 150 const char *slug, 151 TALER_MERCHANTDB_CounterByIntervalStatisticsCallback cb, 152 void *cb_cls) 153 { 154 struct PostgresClosure *pg = cls; 155 struct LookupCounterStatisticsContext context = { 156 .cb = cb, 157 .cb_cls = cb_cls, 158 /* Can be overwritten by the lookup_statistics_counter_by_interval_cb */ 159 .extract_failed = false, 160 .description = NULL 161 }; 162 struct GNUNET_PQ_QueryParam descParams[] = { 163 GNUNET_PQ_query_param_string (slug), 164 GNUNET_PQ_query_param_end 165 }; 166 struct GNUNET_PQ_QueryParam params[] = { 167 GNUNET_PQ_query_param_string (instance_id), 168 GNUNET_PQ_query_param_string (slug), 169 GNUNET_PQ_query_param_end 170 }; 171 enum GNUNET_DB_QueryStatus qs; 172 173 check_connection (pg); 174 PREPARE (pg, 175 "lookup_statistics_counter_by_interval_description", 176 "SELECT description" 177 " FROM merchant_statistic_interval_meta" 178 " WHERE slug=$1 LIMIT 1"); 179 qs = GNUNET_PQ_eval_prepared_multi_select ( 180 pg->conn, 181 "lookup_statistics_counter_by_interval_description", 182 descParams, 183 &lookup_statistics_counter_by_interval_desc_cb, 184 &context); 185 /* If there was an error inside the cb, return a hard error. */ 186 if (context.extract_failed) 187 { 188 GNUNET_break (0); 189 return GNUNET_DB_STATUS_HARD_ERROR; 190 } 191 PREPARE (pg, 192 "lookup_statistics_counter_by_interval", 193 "SELECT *" 194 " FROM merchant_statistic_interval_number_get($2,$1)"); 195 qs = GNUNET_PQ_eval_prepared_multi_select ( 196 pg->conn, 197 "lookup_statistics_counter_by_interval", 198 params, 199 &lookup_statistics_counter_by_interval_cb, 200 &context); 201 if (NULL != context.description) 202 GNUNET_free (context.description); 203 /* If there was an error inside the cb, return a hard error. */ 204 if (context.extract_failed) 205 { 206 GNUNET_break (0); 207 return GNUNET_DB_STATUS_HARD_ERROR; 208 } 209 return qs; 210 }