Line data Source code
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 4 : lookup_statistics_counter_by_bucket_cb (void *cls,
62 : PGresult *result,
63 : unsigned int num_results)
64 : {
65 4 : struct LookupCounterStatisticsContext *tflc = cls;
66 :
67 28 : 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 24 : struct GNUNET_PQ_ResultSpec rs[] = {
75 24 : GNUNET_PQ_result_spec_string ("description",
76 : &description),
77 24 : GNUNET_PQ_result_spec_uint64 ("bucket_start",
78 : &bucket_start_epoch),
79 24 : GNUNET_PQ_result_spec_uint64 ("bucket_end",
80 : &bucket_end_epoch),
81 24 : GNUNET_PQ_result_spec_string ("bucket_range",
82 : &bucket_range),
83 24 : 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 24 : if (GNUNET_OK !=
91 24 : GNUNET_PQ_extract_result (result,
92 : rs,
93 : i))
94 : {
95 0 : GNUNET_break (0);
96 0 : tflc->extract_failed = true;
97 0 : return;
98 : }
99 :
100 24 : bucket_start = GNUNET_TIME_timestamp_from_s (bucket_start_epoch);
101 24 : bucket_end = GNUNET_TIME_timestamp_from_s (bucket_end_epoch);
102 24 : tflc->cb (tflc->cb_cls,
103 : description,
104 : bucket_start,
105 : bucket_end,
106 : bucket_range,
107 : cumulative_number);
108 24 : GNUNET_PQ_cleanup_result (rs);
109 : }
110 : }
111 :
112 :
113 : enum GNUNET_DB_QueryStatus
114 4 : 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 4 : struct PostgresClosure *pg = cls;
122 4 : 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 4 : struct GNUNET_PQ_QueryParam params[] = {
129 4 : GNUNET_PQ_query_param_string (instance_id),
130 4 : GNUNET_PQ_query_param_string (slug),
131 : GNUNET_PQ_query_param_end
132 : };
133 : enum GNUNET_DB_QueryStatus qs;
134 :
135 4 : check_connection (pg);
136 4 : 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 4 : 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 4 : if (context.extract_failed)
162 : {
163 0 : GNUNET_break (0);
164 0 : return GNUNET_DB_STATUS_HARD_ERROR;
165 : }
166 4 : return qs;
167 : }
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