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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/*
This file is part of TALER
Copyright (C) 2023 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_rewards.c
* @brief Implementation of the lookup_rewards 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_rewards.h"
#include "pg_helper.h"
/**
* Context used for postgres_lookup_rewards().
*/
struct LookupMerchantRewardsContext
{
/**
* Postgres context.
*/
struct PostgresClosure *pg;
/**
* Function to call with the results.
*/
TALER_MERCHANTDB_RewardsCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Internal result.
*/
enum GNUNET_DB_QueryStatus qs;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results about rewards.
*
* @param[in,out] cls of type `struct LookupRewardsContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
lookup_rewards_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct LookupMerchantRewardsContext *plc = cls;
for (unsigned int i = 0; i < num_results; i++)
{
uint64_t row_id;
struct TALER_RewardIdentifierP reward_id;
struct TALER_Amount reward_amount;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_uint64 ("reward_serial",
&row_id),
GNUNET_PQ_result_spec_auto_from_type ("reward_id",
&reward_id),
TALER_PQ_result_spec_amount_with_currency ("amount",
&reward_amount),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
plc->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
plc->cb (plc->cb_cls,
row_id,
reward_id,
reward_amount);
GNUNET_PQ_cleanup_result (rs);
}
}
enum GNUNET_DB_QueryStatus
TMH_PG_lookup_rewards (void *cls,
const char *instance_id,
enum TALER_EXCHANGE_YesNoAll expired,
int64_t limit,
uint64_t offset,
TALER_MERCHANTDB_RewardsCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct LookupMerchantRewardsContext plc = {
.pg = pg,
.cb = cb,
.cb_cls = cb_cls
};
uint64_t ulimit = (limit > 0) ? limit : -limit;
uint8_t bexpired;
struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_string (instance_id),
GNUNET_PQ_query_param_uint64 (&ulimit),
GNUNET_PQ_query_param_uint64 (&offset),
GNUNET_PQ_query_param_absolute_time (&now),
GNUNET_PQ_query_param_auto_from_type (&bexpired),
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
char stmt[128];
bexpired = (TALER_EXCHANGE_YNA_YES == expired);
GNUNET_snprintf (stmt,
sizeof (stmt),
"lookup_rewards_%s%s",
(limit > 0) ? "inc" : "dec",
(TALER_EXCHANGE_YNA_ALL == expired) ? "" : "_expired");
check_connection (pg);
PREPARE (pg,
"lookup_rewards_inc",
"SELECT"
" reward_serial"
",reward_id"
",amount"
",CAST($4 as BIGINT)" /* otherwise $4 is unused and Postgres unhappy */
",CAST($5 as BOOL)" /* otherwise $5 is unused and Postgres unhappy */
" FROM merchant_rewards"
" JOIN merchant_reward_reserves USING (reserve_serial)"
" WHERE merchant_serial ="
" (SELECT merchant_serial"
" FROM merchant_instances"
" WHERE merchant_id=$1)"
" AND"
" reward_serial > $3"
" ORDER BY reward_serial ASC"
" LIMIT $2");
PREPARE (pg,
"lookup_rewards_dec",
"SELECT"
" reward_serial"
",reward_id"
",amount"
",CAST($4 as BIGINT)" /* otherwise $4 is unused and Postgres unhappy */
",CAST($5 as BOOL)" /* otherwise $5 is unused and Postgres unhappy */
" FROM merchant_rewards"
" JOIN merchant_reward_reserves USING (reserve_serial)"
" WHERE merchant_serial ="
" (SELECT merchant_serial"
" FROM merchant_instances"
" WHERE merchant_id=$1)"
" AND"
" reward_serial < $3"
" ORDER BY reward_serial DESC"
" LIMIT $2");
PREPARE (pg,
"lookup_rewards_inc_expired",
"SELECT"
" reward_serial"
",reward_id"
",amount"
" FROM merchant_rewards"
" JOIN merchant_reward_reserves USING (reserve_serial)"
" WHERE merchant_serial ="
" (SELECT merchant_serial"
" FROM merchant_instances"
" WHERE merchant_id=$1)"
" AND"
" reward_serial > $3"
" AND"
" CAST($5 as BOOL) = (merchant_rewards.expiration < $4)"
" ORDER BY reward_serial ASC"
" LIMIT $2");
PREPARE (pg,
"lookup_rewards_dec_expired",
"SELECT"
" reward_serial"
",reward_id"
",amount"
" FROM merchant_rewards"
" JOIN merchant_reward_reserves USING (reserve_serial)"
" WHERE merchant_serial ="
" (SELECT merchant_serial"
" FROM merchant_instances"
" WHERE merchant_id=$1)"
" AND"
" reward_serial < $3"
" AND"
" CAST($5 as BOOL) = (merchant_rewards.expiration < $4)"
" ORDER BY reward_serial DESC"
" LIMIT $2");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
stmt,
params,
&lookup_rewards_cb,
&plc);
if (0 != plc.qs)
return plc.qs;
return qs;
}
|
