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 src/backenddb/iterate_products.c
18 : * @brief Implementation of the iterate_products function for Postgres
19 : * @author Iván Ávalos
20 : */
21 : #include "platform.h"
22 : #include <taler/taler_pq_lib.h>
23 : #include "merchant-database/iterate_products.h"
24 : #include "helper.h"
25 :
26 :
27 : /**
28 : * Hard upper bound on the number of records returned by a single
29 : * call, regardless of the limit requested by the client.
30 : */
31 : #define MAX_RECORDS 50000
32 :
33 :
34 : /**
35 : * Context used for TALER_MERCHANTDB_iterate_products().
36 : */
37 : struct LookupProductsContext
38 : {
39 : /**
40 : * Function to call with the results.
41 : */
42 : TALER_MERCHANTDB_ProductsCallback cb;
43 :
44 : /**
45 : * Closure for @a cb.
46 : */
47 : void *cb_cls;
48 :
49 : /**
50 : * Did database result extraction fail?
51 : */
52 : bool extract_failed;
53 : };
54 :
55 :
56 : /**
57 : * Function to be called with the results of a SELECT statement
58 : * that has returned @a num_results results about products.
59 : *
60 : * @param[in,out] cls of type `struct LookupProductsContext *`
61 : * @param result the postgres result
62 : * @param num_results the number of results in @a result
63 : */
64 : static void
65 17 : lookup_products_cb (void *cls,
66 : PGresult *result,
67 : unsigned int num_results)
68 : {
69 17 : struct LookupProductsContext *plc = cls;
70 :
71 24 : for (unsigned int i = 0; i < num_results; i++)
72 : {
73 : char *product_id;
74 : uint64_t product_serial;
75 7 : struct GNUNET_PQ_ResultSpec rs[] = {
76 7 : GNUNET_PQ_result_spec_string ("product_id",
77 : &product_id),
78 7 : GNUNET_PQ_result_spec_uint64 ("product_serial",
79 : &product_serial),
80 : GNUNET_PQ_result_spec_end
81 : };
82 :
83 7 : if (GNUNET_OK !=
84 7 : GNUNET_PQ_extract_result (result,
85 : rs,
86 : i))
87 : {
88 0 : GNUNET_break (0);
89 0 : plc->extract_failed = true;
90 0 : return;
91 : }
92 7 : plc->cb (plc->cb_cls,
93 : product_serial,
94 : product_id);
95 7 : GNUNET_PQ_cleanup_result (rs);
96 : }
97 : }
98 :
99 :
100 : enum GNUNET_DB_QueryStatus
101 17 : TALER_MERCHANTDB_iterate_products (
102 : struct TALER_MERCHANTDB_PostgresContext *pg,
103 : const char *instance_id,
104 : uint64_t offset,
105 : int64_t limit,
106 : const char *category_filter,
107 : const char *name_filter,
108 : const char *description_filter,
109 : uint64_t product_group_id_filter,
110 : TALER_MERCHANTDB_ProductsCallback cb,
111 : void *cb_cls)
112 : {
113 17 : uint64_t plimit = GNUNET_MIN ((uint64_t) MAX_RECORDS,
114 : TALER_MERCHANTDB_abs_limit (limit));
115 17 : struct LookupProductsContext plc = {
116 : .cb = cb,
117 : .cb_cls = cb_cls,
118 : /* Can be overwritten by the lookup_products_cb */
119 : .extract_failed = false,
120 : };
121 17 : struct GNUNET_PQ_QueryParam params[] = {
122 17 : GNUNET_PQ_query_param_uint64 (&offset),
123 : NULL == category_filter
124 17 : ? GNUNET_PQ_query_param_null ()
125 17 : : GNUNET_PQ_query_param_string (category_filter),
126 : NULL == name_filter
127 16 : ? GNUNET_PQ_query_param_null ()
128 17 : : GNUNET_PQ_query_param_string (name_filter),
129 : NULL == description_filter
130 17 : ? GNUNET_PQ_query_param_null ()
131 17 : : GNUNET_PQ_query_param_string (description_filter),
132 17 : GNUNET_PQ_query_param_uint64 (&plimit),
133 17 : GNUNET_PQ_query_param_uint64 (&product_group_id_filter),
134 : GNUNET_PQ_query_param_end
135 : };
136 : enum GNUNET_DB_QueryStatus qs;
137 :
138 17 : GNUNET_assert (NULL != pg->current_merchant_id);
139 17 : GNUNET_assert (0 == strcmp (instance_id,
140 : pg->current_merchant_id));
141 17 : if (limit > 0)
142 : {
143 17 : TMH_PQ_prepare_anon (pg,
144 : "SELECT"
145 : " product_id"
146 : " ,product_serial"
147 : " FROM merchant_inventory"
148 : " WHERE product_serial > $1"
149 : " AND ( ($2::TEXT IS NULL) OR"
150 : " (product_serial IN"
151 : " (SELECT product_serial"
152 : " FROM merchant_product_categories"
153 : " WHERE category_serial IN"
154 : " (SELECT category_serial"
155 : " FROM merchant_categories"
156 : " WHERE LOWER(category_name) LIKE LOWER($2)))) )"
157 : " AND ( (0 = $6::INT8) OR"
158 : " (product_group_serial = $6) )"
159 : " AND ( ($3::TEXT IS NULL) OR"
160 : " (LOWER(product_name) LIKE LOWER($3)) )"
161 : " AND ( ($4::TEXT IS NULL) OR"
162 : " (description LIKE LOWER($4)) )"
163 : " ORDER BY product_serial ASC"
164 : " LIMIT $5");
165 : }
166 : else
167 : {
168 0 : TMH_PQ_prepare_anon (pg,
169 : "SELECT"
170 : " product_id"
171 : " ,product_serial"
172 : " FROM merchant_inventory"
173 : " WHERE product_serial < $1"
174 : " AND ( ($2::TEXT IS NULL) OR"
175 : " (product_serial IN"
176 : " (SELECT product_serial"
177 : " FROM merchant_product_categories"
178 : " WHERE category_serial IN"
179 : " (SELECT category_serial"
180 : " FROM merchant_categories"
181 : " WHERE LOWER(category_name) LIKE LOWER($2)))) )"
182 : " AND ( (0 = $6::INT8) OR"
183 : " (product_group_serial = $6) )"
184 : " AND ( ($3::TEXT IS NULL) OR"
185 : " (LOWER(product_name) LIKE LOWER($3)) )"
186 : " AND ( ($4::TEXT IS NULL) OR"
187 : " (description LIKE LOWER($4)) )"
188 : " ORDER BY product_serial DESC"
189 : " LIMIT $5");
190 : }
191 17 : qs = GNUNET_PQ_eval_prepared_multi_select (
192 : pg->conn,
193 : "",
194 : params,
195 : &lookup_products_cb,
196 : &plc);
197 : /* If there was an error inside lookup_products_cb, return a hard error. */
198 17 : if (plc.extract_failed)
199 : {
200 0 : GNUNET_break (0);
201 0 : return GNUNET_DB_STATUS_HARD_ERROR;
202 : }
203 17 : return qs;
204 : }
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