1 /**
2 * collectd - src/utils_match.h
3 * Copyright (C) 2008 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 **/
23 #ifndef UTILS_MATCH_H
24 #define UTILS_MATCH_H 1
26 #include "plugin.h"
28 /*
29 * Defines
30 */
31 #define UTILS_MATCH_DS_TYPE_GAUGE 0x10
32 #define UTILS_MATCH_DS_TYPE_COUNTER 0x20
33 #define UTILS_MATCH_DS_TYPE_DERIVE 0x30
34 #define UTILS_MATCH_DS_TYPE_ABSOLUTE 0x40
36 #define UTILS_MATCH_CF_GAUGE_AVERAGE 0x01
37 #define UTILS_MATCH_CF_GAUGE_MIN 0x02
38 #define UTILS_MATCH_CF_GAUGE_MAX 0x04
39 #define UTILS_MATCH_CF_GAUGE_LAST 0x08
41 #define UTILS_MATCH_CF_COUNTER_SET 0x01
42 #define UTILS_MATCH_CF_COUNTER_ADD 0x02
43 #define UTILS_MATCH_CF_COUNTER_INC 0x04
45 #define UTILS_MATCH_CF_DERIVE_SET 0x01
46 #define UTILS_MATCH_CF_DERIVE_ADD 0x02
47 #define UTILS_MATCH_CF_DERIVE_INC 0x04
49 #define UTILS_MATCH_CF_ABSOLUTE_SET 0x01
50 #define UTILS_MATCH_CF_ABSOLUTE_ADD 0x02
51 #define UTILS_MATCH_CF_ABSOLUTE_INC 0x04
53 /*
54 * Data types
55 */
56 struct cu_match_s;
57 typedef struct cu_match_s cu_match_t;
59 struct cu_match_value_s
60 {
61 int ds_type;
62 value_t value;
63 unsigned int values_num;
64 };
65 typedef struct cu_match_value_s cu_match_value_t;
67 /*
68 * Prototypes
69 */
70 /*
71 * NAME
72 * match_create_callback
73 *
74 * DESCRIPTION
75 * Creates a new `cu_match_t' object which will use the regular expression
76 * `regex' to match lines, see the `match_apply' method below. If the line
77 * matches, the callback passed in `callback' will be called along with the
78 * pointer `user_pointer'.
79 * The string that's passed to the callback depends on the regular expression:
80 * If the regular expression includes a sub-match, i. e. something like
81 * "value=([0-9][0-9]*)"
82 * then only the submatch (the part in the parenthesis) will be passed to the
83 * callback. If there is no submatch, then the entire string is passed to the
84 * callback.
85 * The optional `excluderegex' allows to exclude the line from the match, if
86 * the excluderegex matches.
87 */
88 cu_match_t *match_create_callback (const char *regex, const char *excluderegex,
89 int (*callback) (const char *str,
90 char * const *matches, size_t matches_num, void *user_data),
91 void *user_data);
93 /*
94 * NAME
95 * match_create_simple
96 *
97 * DESCRIPTION
98 * Creates a new `cu_match_t' with a default callback. The user data for that
99 * default callback will be a `cu_match_value_t' structure, with
100 * `ds_type' copied to the structure. The default callback will handle the
101 * string as containing a number (see strtoll(3) and strtod(3)) and store that
102 * number in the `value' member. How that is done depends on `ds_type':
103 *
104 * UTILS_MATCH_DS_TYPE_GAUGE
105 * The function will search for a floating point number in the string and
106 * store it in value.gauge.
107 * UTILS_MATCH_DS_TYPE_COUNTER_SET
108 * The function will search for an integer in the string and store it in
109 * value.counter.
110 * UTILS_MATCH_DS_TYPE_COUNTER_ADD
111 * The function will search for an integer in the string and add it to the
112 * value in value.counter.
113 * UTILS_MATCH_DS_TYPE_COUNTER_INC
114 * The function will not search for anything in the string and increase
115 * value.counter by one.
116 */
117 cu_match_t *match_create_simple (const char *regex,
118 const char *excluderegex, int ds_type);
120 /*
121 * NAME
122 * match_destroy
123 *
124 * DESCRIPTION
125 * Destroys the object and frees all internal resources.
126 */
127 void match_destroy (cu_match_t *obj);
129 /*
130 * NAME
131 * match_apply
132 *
133 * DESCRIPTION
134 * Tries to match the string `str' with the regular expression of `obj'. If
135 * the string matches, calls the callback in `obj' with the (sub-)match.
136 *
137 * The user_data pointer passed to `match_create_callback' is NOT freed
138 * automatically. The `cu_match_value_t' structure allocated by
139 * `match_create_callback' is freed automatically.
140 */
141 int match_apply (cu_match_t *obj, const char *str);
143 /*
144 * NAME
145 * match_get_user_data
146 *
147 * DESCRIPTION
148 * Returns the pointer passed to `match_create_callback' or a pointer to the
149 * `cu_match_value_t' structure allocated by `match_create_simple'.
150 */
151 void *match_get_user_data (cu_match_t *obj);
153 #endif /* UTILS_MATCH_H */
155 /* vim: set sw=2 sts=2 ts=8 : */