summaryrefslogtreecommitdiff
path: root/src/include/taler_pq_lib.h
blob: 4545b6d5d1f83305dde6142afbc68e0efae8fb28 (plain)
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
/*
  This file is part of TALER
  Copyright (C) 2014, 2015, 2016 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 include/taler_pq_lib.h
 * @brief helper functions for DB interactions
 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
 * @author Florian Dold
 * @author Christian Grothoff
 */
#ifndef TALER_PQ_LIB_H_
#define TALER_PQ_LIB_H_

#include <libpq-fe.h>
#include <jansson.h>
#include <gnunet/gnunet_pq_lib.h>
#include "taler_util.h"

/**
 * Generate query parameter for a currency, consisting of the three
 * components "value", "fraction" and "currency" in this order. The
 * types must be a 64-bit integer, 32-bit integer and a
 * #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
 *
 * @param x pointer to the query parameter to pass
 */
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_amount_nbo (const struct TALER_AmountNBO *x);


/**
 * Generate query parameter for a currency, consisting of the three
 * components "value", "fraction" and "currency" in this order. The
 * types must be a 64-bit integer, 32-bit integer and a
 * #TALER_CURRENCY_LEN-sized BLOB/VARCHAR respectively.
 *
 * @param x pointer to the query parameter to pass
 */
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_amount (const struct TALER_Amount *x);


/**
 * Generate query parameter for a JSON object (stored as a string
 * in the DB).  Note that @a x must really be a JSON object or array,
 * passing just a value (string, integer) is not supported and will
 * result in an abort.
 *
 * @param x pointer to the json object to pass
 */
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_json (const json_t *x);


/**
 * Generate query parameter for an absolute time value.
 * In contrast to
 * #GNUNET_PQ_query_param_absolute_time(), this function
 * will abort (!) if the time given is not rounded!
 * The database must store a 64-bit integer.
 *
 * @param x pointer to the query parameter to pass
 */
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_absolute_time (const struct GNUNET_TIME_Absolute *x);


/**
 * Generate query parameter for an absolute time value.
 * In contrast to
 * #GNUNET_PQ_query_param_absolute_time(), this function
 * will abort (!) if the time given is not rounded!
 * The database must store a 64-bit integer.
 *
 * @param x pointer to the query parameter to pass
 */
struct GNUNET_PQ_QueryParam
TALER_PQ_query_param_absolute_time_nbo (const struct
                                        GNUNET_TIME_AbsoluteNBO *x);


/**
 * Currency amount expected.
 *
 * @param name name of the field in the table
 * @param currency currency to use for @a amount
 * @param[out] amount where to store the result
 * @return array entry for the result specification to use
 */
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_amount_nbo (const char *name,
                                 const char *currency,
                                 struct TALER_AmountNBO *amount);


/**
 * Currency amount expected.
 *
 * @param name name of the field in the table
 * @param currency currency to use for @a amount
 * @param[out] amount where to store the result
 * @return array entry for the result specification to use
 */
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_amount (const char *name,
                             const char *currency,
                             struct TALER_Amount *amount);


/**
 * json_t expected.
 *
 * @param name name of the field in the table
 * @param[out] jp where to store the result
 * @return array entry for the result specification to use
 */
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_json (const char *name,
                           json_t **jp);


/**
 * Rounded absolute time expected.
 * In contrast to #GNUNET_PQ_query_param_absolute_time_nbo(),
 * this function ensures that the result is rounded and can
 * be converted to JSON.
 *
 * @param name name of the field in the table
 * @param[out] at where to store the result
 * @return array entry for the result specification to use
 */
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_absolute_time (const char *name,
                                    struct GNUNET_TIME_Absolute *at);


/**
 * Rounded absolute time expected.
 * In contrast to #GNUNET_PQ_result_spec_absolute_time_nbo(),
 * this function ensures that the result is rounded and can
 * be converted to JSON.
 *
 * @param name name of the field in the table
 * @param[out] at where to store the result
 * @return array entry for the result specification to use
 */
struct GNUNET_PQ_ResultSpec
TALER_PQ_result_spec_absolute_time_nbo (const char *name,
                                        struct GNUNET_TIME_AbsoluteNBO *at);


#endif  /* TALER_PQ_LIB_H_ */

/* end of include/taler_pq_lib.h */