Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022 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 iterate_historic_denom_revenue.c
18 : * @brief Low-level (statement-level) Postgres database access for the exchange
19 : * @author Christian Grothoff
20 : */
21 : #include "taler/taler_pq_lib.h"
22 : #include "auditor-database/iterate_historic_denom_revenue.h"
23 : #include "pg_helper.h"
24 :
25 :
26 : /**
27 : * Hard upper bound on the number of records returned by a single
28 : * call, regardless of the limit requested by the client.
29 : */
30 : #define MAX_RECORDS 50000
31 :
32 :
33 : /**
34 : * Closure for #historic_denom_revenue_cb().
35 : */
36 : struct HistoricDenomRevenueContext
37 : {
38 : /**
39 : * Function to call for each result.
40 : */
41 : TALER_AUDITORDB_HistoricDenominationRevenueDataCallback cb;
42 :
43 : /**
44 : * Closure for @e cb.
45 : */
46 : void *cb_cls;
47 :
48 : /**
49 : * Plugin context.
50 : */
51 : struct TALER_AUDITORDB_PostgresContext *pg;
52 :
53 : /**
54 : * Number of results processed.
55 : */
56 : enum GNUNET_DB_QueryStatus qs;
57 : };
58 :
59 :
60 : /**
61 : * Helper function for #TALER_AUDITORDB_iterate_historic_denom_revenue().
62 : * To be called with the results of a SELECT statement
63 : * that has returned @a num_results results.
64 : *
65 : * @param cls closure of type `struct HistoricRevenueContext *`
66 : * @param result the postgres result
67 : * @param num_results the number of results in @a result
68 : */
69 : static void
70 1 : historic_denom_revenue_cb (void *cls,
71 : PGresult *result,
72 : unsigned int num_results)
73 : {
74 1 : struct HistoricDenomRevenueContext *hrc = cls;
75 1 : struct TALER_AUDITORDB_PostgresContext *pg = hrc->pg;
76 :
77 3 : for (unsigned int i = 0; i < num_results; i++)
78 : {
79 : uint64_t rowid;
80 : struct TALER_DenominationHashP denom_pub_hash;
81 : struct GNUNET_TIME_Timestamp revenue_timestamp;
82 : struct TALER_Amount revenue_balance;
83 : struct TALER_Amount loss;
84 2 : struct GNUNET_PQ_ResultSpec rs[] = {
85 2 : GNUNET_PQ_result_spec_uint64 ("row_id",
86 : &rowid),
87 2 : GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
88 : &denom_pub_hash),
89 2 : GNUNET_PQ_result_spec_timestamp ("revenue_timestamp",
90 : &revenue_timestamp),
91 2 : TALER_PQ_RESULT_SPEC_AMOUNT ("revenue_balance",
92 : &revenue_balance),
93 2 : TALER_PQ_RESULT_SPEC_AMOUNT ("loss_balance",
94 : &loss),
95 : GNUNET_PQ_result_spec_end
96 : };
97 :
98 2 : if (GNUNET_OK !=
99 2 : GNUNET_PQ_extract_result (result,
100 : rs,
101 : i))
102 : {
103 0 : GNUNET_break (0);
104 0 : hrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
105 0 : return;
106 : }
107 :
108 2 : hrc->qs = i + 1;
109 2 : if (GNUNET_OK !=
110 2 : hrc->cb (hrc->cb_cls,
111 : rowid,
112 : &denom_pub_hash,
113 : revenue_timestamp,
114 : &revenue_balance,
115 : &loss))
116 0 : break;
117 : }
118 : }
119 :
120 :
121 : enum GNUNET_DB_QueryStatus
122 1 : TALER_AUDITORDB_iterate_historic_denom_revenue (
123 : struct TALER_AUDITORDB_PostgresContext *pg,
124 : int64_t limit,
125 : uint64_t offset,
126 : TALER_AUDITORDB_HistoricDenominationRevenueDataCallback cb,
127 : void *cb_cls)
128 : {
129 1 : uint64_t ulimit = GNUNET_MIN ((uint64_t) MAX_RECORDS,
130 : TALER_AUDITORDB_abs_limit (limit));
131 1 : struct GNUNET_PQ_QueryParam params[] = {
132 1 : GNUNET_PQ_query_param_uint64 (&offset),
133 1 : GNUNET_PQ_query_param_uint64 (&ulimit),
134 : GNUNET_PQ_query_param_end
135 : };
136 1 : struct HistoricDenomRevenueContext hrc = {
137 : .cb = cb,
138 : .cb_cls = cb_cls,
139 : .pg = pg
140 : };
141 : enum GNUNET_DB_QueryStatus qs;
142 :
143 1 : PREPARE (pg,
144 : "iterate_historic_denom_revenue_denomination_revenue_select_inc",
145 : "SELECT"
146 : " row_id"
147 : ",denom_pub_hash"
148 : ",revenue_timestamp"
149 : ",revenue_balance"
150 : ",loss_balance"
151 : " FROM auditor_historic_denomination_revenue"
152 : " WHERE row_id > $1"
153 : " ORDER BY row_id ASC"
154 : " LIMIT $2;");
155 1 : PREPARE (pg,
156 : "iterate_historic_denom_revenue_denomination_revenue_select_dec",
157 : "SELECT"
158 : " row_id"
159 : ",denom_pub_hash"
160 : ",revenue_timestamp"
161 : ",revenue_balance"
162 : ",loss_balance"
163 : " FROM auditor_historic_denomination_revenue"
164 : " WHERE row_id < $1"
165 : " ORDER BY row_id DESC"
166 : " LIMIT $2;");
167 1 : qs = GNUNET_PQ_eval_prepared_multi_select (
168 : pg->conn,
169 : limit > 0
170 : ? "iterate_historic_denom_revenue_denomination_revenue_select_inc"
171 : : "iterate_historic_denom_revenue_denomination_revenue_select_dec",
172 : params,
173 : &historic_denom_revenue_cb,
174 : &hrc);
175 1 : if (qs <= 0)
176 0 : return qs;
177 1 : return hrc.qs;
178 : }
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