Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2024, 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_all_products.c
18 : * @brief Implementation of the lookup_all_products 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_lookup_all_products.h"
26 : #include "pg_helper.h"
27 :
28 : /**
29 : * Context used for TMH_PG_lookup_all_products().
30 : */
31 : struct LookupProductsContext
32 : {
33 : /**
34 : * Function to call with the results.
35 : */
36 : TALER_MERCHANTDB_ProductCallback cb;
37 :
38 : /**
39 : * Closure for @a cb.
40 : */
41 : void *cb_cls;
42 :
43 : /**
44 : * Postgres context.
45 : */
46 : struct PostgresClosure *pg;
47 :
48 : /**
49 : * Did database result extraction fail?
50 : */
51 : bool extract_failed;
52 : };
53 :
54 :
55 : /**
56 : * Function to be called with the results of a SELECT statement
57 : * that has returned @a num_results results about products.
58 : *
59 : * @param[in,out] cls of type `struct LookupProductsContext *`
60 : * @param result the postgres result
61 : * @param num_results the number of results in @a result
62 : */
63 : static void
64 0 : lookup_products_cb (void *cls,
65 : PGresult *result,
66 : unsigned int num_results)
67 : {
68 0 : struct LookupProductsContext *plc = cls;
69 0 : struct PostgresClosure *pg = plc->pg;
70 :
71 0 : for (unsigned int i = 0; i < num_results; i++)
72 : {
73 : char *product_id;
74 : uint64_t product_serial;
75 : struct TALER_MERCHANTDB_ProductDetails pd;
76 : size_t num_categories;
77 : uint64_t *categories;
78 0 : struct GNUNET_PQ_ResultSpec rs[] = {
79 0 : GNUNET_PQ_result_spec_string ("product_id",
80 : &product_id),
81 0 : GNUNET_PQ_result_spec_uint64 ("product_serial",
82 : &product_serial),
83 0 : GNUNET_PQ_result_spec_string ("product_name",
84 : &pd.product_name),
85 0 : GNUNET_PQ_result_spec_string ("description",
86 : &pd.description),
87 0 : TALER_PQ_result_spec_json ("description_i18n",
88 : &pd.description_i18n),
89 0 : GNUNET_PQ_result_spec_string ("unit",
90 : &pd.unit),
91 0 : TALER_PQ_result_spec_amount_with_currency ("price",
92 : &pd.price),
93 0 : TALER_PQ_result_spec_array_amount_with_currency (pg->conn,
94 : "price_array",
95 : &pd.price_array_length,
96 : &pd.price_array),
97 0 : TALER_PQ_result_spec_json ("taxes",
98 : &pd.taxes),
99 0 : GNUNET_PQ_result_spec_uint64 ("total_stock",
100 : &pd.total_stock),
101 0 : GNUNET_PQ_result_spec_uint32 ("total_stock_frac",
102 : &pd.total_stock_frac),
103 0 : GNUNET_PQ_result_spec_bool ("allow_fractional_quantity",
104 : &pd.allow_fractional_quantity),
105 0 : GNUNET_PQ_result_spec_uint32 ("fractional_precision_level",
106 : &pd.fractional_precision_level),
107 0 : GNUNET_PQ_result_spec_uint64 ("total_sold",
108 : &pd.total_sold),
109 0 : GNUNET_PQ_result_spec_uint32 ("total_sold_frac",
110 : &pd.total_sold_frac),
111 0 : GNUNET_PQ_result_spec_uint64 ("total_lost",
112 : &pd.total_lost),
113 0 : GNUNET_PQ_result_spec_uint32 ("total_lost_frac",
114 : &pd.total_lost_frac),
115 0 : GNUNET_PQ_result_spec_string ("image",
116 : &pd.image),
117 0 : TALER_PQ_result_spec_json ("address",
118 : &pd.address),
119 0 : GNUNET_PQ_result_spec_timestamp ("next_restock",
120 : &pd.next_restock),
121 0 : GNUNET_PQ_result_spec_uint32 ("minimum_age",
122 : &pd.minimum_age),
123 0 : GNUNET_PQ_result_spec_array_uint64 (pg->conn,
124 : "categories",
125 : &num_categories,
126 : &categories),
127 : GNUNET_PQ_result_spec_end
128 : };
129 :
130 0 : if (GNUNET_OK !=
131 0 : GNUNET_PQ_extract_result (result,
132 : rs,
133 : i))
134 : {
135 0 : GNUNET_break (0);
136 0 : plc->extract_failed = true;
137 0 : return;
138 : }
139 0 : plc->cb (plc->cb_cls,
140 : product_serial,
141 : product_id,
142 : &pd,
143 : num_categories,
144 : categories);
145 0 : GNUNET_PQ_cleanup_result (rs);
146 : }
147 : }
148 :
149 :
150 : enum GNUNET_DB_QueryStatus
151 0 : TMH_PG_lookup_all_products (void *cls,
152 : const char *instance_id,
153 : TALER_MERCHANTDB_ProductCallback cb,
154 : void *cb_cls)
155 : {
156 0 : struct PostgresClosure *pg = cls;
157 0 : struct LookupProductsContext plc = {
158 : .cb = cb,
159 : .cb_cls = cb_cls,
160 : .pg = pg,
161 : /* Can be overwritten by the lookup_products_cb */
162 : .extract_failed = false,
163 : };
164 0 : struct GNUNET_PQ_QueryParam params[] = {
165 0 : GNUNET_PQ_query_param_string (instance_id),
166 : GNUNET_PQ_query_param_end
167 : };
168 : enum GNUNET_DB_QueryStatus qs;
169 :
170 0 : check_connection (pg);
171 0 : PREPARE (pg,
172 : "lookup_all_products",
173 : "SELECT"
174 : " description"
175 : ",description_i18n::TEXT"
176 : ",product_name"
177 : ",unit"
178 : ",price"
179 : ",price_array"
180 : ",taxes::TEXT"
181 : ",total_stock"
182 : ",total_stock_frac"
183 : ",allow_fractional_quantity"
184 : ",fractional_precision_level"
185 : ",total_sold"
186 : ",total_sold_frac"
187 : ",total_lost"
188 : ",total_lost_frac"
189 : ",image"
190 : ",minv.address::TEXT"
191 : ",next_restock"
192 : ",minimum_age"
193 : ",product_id"
194 : ",product_serial"
195 : ",t.category_array AS categories"
196 : " FROM merchant_inventory minv"
197 : " JOIN merchant_instances inst"
198 : " USING (merchant_serial)"
199 : ",LATERAL ("
200 : " SELECT ARRAY ("
201 : " SELECT mpc.category_serial"
202 : " FROM merchant_product_categories mpc"
203 : " WHERE mpc.product_serial = minv.product_serial"
204 : " ) AS category_array"
205 : " ) t"
206 : " WHERE inst.merchant_id=$1");
207 0 : qs = GNUNET_PQ_eval_prepared_multi_select (
208 : pg->conn,
209 : "lookup_all_products",
210 : params,
211 : &lookup_products_cb,
212 : &plc);
213 : /* If there was an error inside lookup_products_cb, return a hard error. */
214 0 : if (plc.extract_failed)
215 0 : return GNUNET_DB_STATUS_HARD_ERROR;
216 0 : return qs;
217 : }
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