1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
/*
This file is part of TALER
Copyright (C) 2022 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file backenddb/pg_lookup_products.c
* @brief Implementation of the lookup_products function for Postgres
* @author Iván Ávalos
*/
#include "platform.h"
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "pg_lookup_products.h"
#include "pg_helper.h"
/**
* Context used for postgres_lookup_products().
*/
struct LookupProductsContext
{
/**
* Function to call with the results.
*/
TALER_MERCHANTDB_ProductsCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Did database result extraction fail?
*/
bool extract_failed;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results about products.
*
* @param[in,out] cls of type `struct LookupProductsContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
lookup_products_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct LookupProductsContext *plc = cls;
for (unsigned int i = 0; i < num_results; i++)
{
char *product_id;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_string ("product_id",
&product_id),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
plc->extract_failed = true;
return;
}
plc->cb (plc->cb_cls,
product_id);
GNUNET_PQ_cleanup_result (rs);
}
}
enum GNUNET_DB_QueryStatus
TMH_PG_lookup_products (void *cls,
const char *instance_id,
TALER_MERCHANTDB_ProductsCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct LookupProductsContext plc = {
.cb = cb,
.cb_cls = cb_cls,
/* Can be overwritten by the lookup_products_cb */
.extract_failed = false,
};
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_string (instance_id),
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
check_connection (pg);
PREPARE (pg,
"lookup_products",
"SELECT"
" product_id"
" FROM merchant_inventory"
" JOIN merchant_instances"
" USING (merchant_serial)"
" WHERE merchant_instances.merchant_id=$1");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"lookup_products",
params,
&lookup_products_cb,
&plc);
/* If there was an error inside lookup_products_cb, return a hard error. */
if (plc.extract_failed)
return GNUNET_DB_STATUS_HARD_ERROR;
return qs;
}
|
