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
|
/*
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 pg_get_expired_reserves.c
* @brief Low-level (statement-level) Postgres database access for the exchange
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_error_codes.h"
#include "taler_dbevents.h"
#include "taler_pq_lib.h"
#include "pg_get_expired_reserves.h"
#include "pg_helper.h"
/**
* Closure for #reserve_expired_cb().
*/
struct ExpiredReserveContext
{
/**
* Function to call for each expired reserve.
*/
TALER_EXCHANGEDB_ReserveExpiredCallback rec;
/**
* Closure to give to @e rec.
*/
void *rec_cls;
/**
* Plugin context.
*/
struct PostgresClosure *pg;
/**
* Set to #GNUNET_SYSERR on error.
*/
enum GNUNET_GenericReturnValue status;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
reserve_expired_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct ExpiredReserveContext *erc = cls;
struct PostgresClosure *pg = erc->pg;
enum GNUNET_GenericReturnValue ret;
ret = GNUNET_OK;
for (unsigned int i = 0; i<num_results; i++)
{
struct GNUNET_TIME_Timestamp exp_date;
char *account_details;
struct TALER_ReservePublicKeyP reserve_pub;
struct TALER_Amount remaining_balance;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_timestamp ("expiration_date",
&exp_date),
GNUNET_PQ_result_spec_string ("account_details",
&account_details),
GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
&reserve_pub),
TALER_PQ_result_spec_amount ("current_balance",
pg->currency,
&remaining_balance),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
ret = GNUNET_SYSERR;
break;
}
ret = erc->rec (erc->rec_cls,
&reserve_pub,
&remaining_balance,
account_details,
exp_date,
0);
GNUNET_PQ_cleanup_result (rs);
if (GNUNET_OK != ret)
break;
}
erc->status = ret;
}
enum GNUNET_DB_QueryStatus
TEH_PG_get_expired_reserves (void *cls,
struct GNUNET_TIME_Timestamp now,
TALER_EXCHANGEDB_ReserveExpiredCallback rec,
void *rec_cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_timestamp (&now),
GNUNET_PQ_query_param_end
};
struct ExpiredReserveContext ectx = {
.rec = rec,
.rec_cls = rec_cls,
.pg = pg,
.status = GNUNET_OK
};
enum GNUNET_DB_QueryStatus qs;
PREPARE (pg,
"get_expired_reserves",
"WITH ed AS MATERIALIZED ( "
" SELECT * "
" FROM reserves "
" WHERE expiration_date <= $1 "
" AND ((current_balance).val != 0 OR (current_balance).frac != 0) "
" ORDER BY expiration_date ASC "
" LIMIT 1 "
") "
"SELECT "
" ed.expiration_date "
" ,payto_uri AS account_details "
" ,ed.reserve_pub "
" ,current_balance "
"FROM ( "
" SELECT "
" * "
" FROM reserves_in "
" WHERE reserve_pub = ( "
" SELECT reserve_pub FROM ed) "
" ) ri "
"JOIN wire_targets wt ON (ri.wire_source_h_payto = wt.wire_target_h_payto) "
"JOIN ed ON (ri.reserve_pub = ed.reserve_pub);");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"get_expired_reserves",
params,
&reserve_expired_cb,
&ectx);
switch (ectx.status)
{
case GNUNET_SYSERR:
return GNUNET_DB_STATUS_HARD_ERROR;
case GNUNET_NO:
return GNUNET_DB_STATUS_SOFT_ERROR;
case GNUNET_OK:
break;
}
return qs;
}
|
