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_select_product_groups.c
18 : * @brief Implementation of the select_product_groups 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 "pg_select_product_groups.h"
26 : #include "pg_helper.h"
27 :
28 :
29 : /**
30 : * Context used for TMH_PG_lookup_product_groups().
31 : */
32 : struct LookupProductGroupsContext
33 : {
34 : /**
35 : * Function to call with the results.
36 : */
37 : TALER_MERCHANTDB_ProductGroupsCallback 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 :
51 : /**
52 : * Function to be called with the results of a SELECT statement
53 : * that has returned @a num_results results about product groups.
54 : *
55 : * @param[in,out] cls of type `struct LookupProductGroupsContext *`
56 : * @param result the postgres result
57 : * @param num_results the number of results in @a result
58 : */
59 : static void
60 0 : lookup_product_groups_cb (void *cls,
61 : PGresult *result,
62 : unsigned int num_results)
63 : {
64 0 : struct LookupProductGroupsContext *plc = cls;
65 :
66 0 : for (unsigned int i = 0; i < num_results; i++)
67 : {
68 : uint64_t product_group_serial;
69 : char *product_group_name;
70 : char *product_group_description;
71 0 : struct GNUNET_PQ_ResultSpec rs[] = {
72 0 : GNUNET_PQ_result_spec_uint64 ("product_group_serial",
73 : &product_group_serial),
74 0 : GNUNET_PQ_result_spec_string ("product_group_name",
75 : &product_group_name),
76 0 : GNUNET_PQ_result_spec_string ("product_group_description",
77 : &product_group_description),
78 : GNUNET_PQ_result_spec_end
79 : };
80 :
81 0 : if (GNUNET_OK !=
82 0 : GNUNET_PQ_extract_result (result,
83 : rs,
84 : i))
85 : {
86 0 : GNUNET_break (0);
87 0 : plc->extract_failed = true;
88 0 : return;
89 : }
90 0 : plc->cb (plc->cb_cls,
91 : product_group_serial,
92 : product_group_name,
93 : product_group_description);
94 0 : GNUNET_PQ_cleanup_result (rs);
95 : }
96 : }
97 :
98 :
99 : enum GNUNET_DB_QueryStatus
100 0 : TMH_PG_select_product_groups (void *cls,
101 : const char *instance_id,
102 : int64_t limit,
103 : uint64_t offset,
104 : TALER_MERCHANTDB_ProductGroupsCallback cb,
105 : void *cb_cls)
106 : {
107 0 : struct PostgresClosure *pg = cls;
108 0 : uint64_t plimit = (uint64_t) ((limit < 0) ? -limit : limit);
109 0 : struct LookupProductGroupsContext plc = {
110 : .cb = cb,
111 : .cb_cls = cb_cls,
112 : /* Can be overwritten by the lookup_product_groups_cb */
113 : .extract_failed = false,
114 : };
115 0 : struct GNUNET_PQ_QueryParam params[] = {
116 0 : GNUNET_PQ_query_param_string (instance_id),
117 0 : GNUNET_PQ_query_param_uint64 (&offset),
118 0 : GNUNET_PQ_query_param_uint64 (&plimit),
119 : GNUNET_PQ_query_param_end
120 : };
121 : enum GNUNET_DB_QueryStatus qs;
122 :
123 0 : check_connection (pg);
124 0 : PREPARE (pg,
125 : "lookup_product_groups_asc",
126 : "SELECT"
127 : " product_group_serial"
128 : " ,product_group_name"
129 : " ,product_group_description"
130 : " FROM merchant_product_groups"
131 : " JOIN merchant_instances"
132 : " USING (merchant_serial)"
133 : " WHERE merchant_instances.merchant_id=$1"
134 : " AND product_group_serial > $2"
135 : " ORDER BY product_group_serial ASC"
136 : " LIMIT $3");
137 0 : PREPARE (pg,
138 : "lookup_product_groups_desc",
139 : "SELECT"
140 : " product_group_serial"
141 : " ,product_group_name"
142 : " ,product_group_description"
143 : " FROM merchant_product_groups"
144 : " JOIN merchant_instances"
145 : " USING (merchant_serial)"
146 : " WHERE merchant_instances.merchant_id=$1"
147 : " AND product_group_serial < $2"
148 : " ORDER BY product_group_serial DESC"
149 : " LIMIT $3");
150 0 : qs = GNUNET_PQ_eval_prepared_multi_select (
151 : pg->conn,
152 : (limit > 0)
153 : ? "lookup_product_groups_asc"
154 : : "lookup_product_groups_desc",
155 : params,
156 : &lookup_product_groups_cb,
157 : &plc);
158 : /* If there was an error inside lookup_product_groups_cb, return a hard error. */
159 0 : if (plc.extract_failed)
160 : {
161 0 : GNUNET_break (0);
162 0 : return GNUNET_DB_STATUS_HARD_ERROR;
163 : }
164 0 : return qs;
165 : }
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