2 * collectd - src/utils_tail_match.h
3 * Copyright (C) 2007-2008 C-Ware, Inc.
4 * Copyright (C) 2008 Florian Forster
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22 * DEALINGS IN THE SOFTWARE.
25 * Luke Heberling <lukeh at c-ware.com>
26 * Florian Forster <octo at collectd.org>
29 * `tail_match' uses `utils_tail' and `utils_match' to tail a file and try to
30 * match it using several regular expressions. Matches are then passed to
31 * user-provided callback functions or default handlers. This should keep all
32 * of the parsing logic out of the actual plugin, which only operate with
33 * regular expressions.
36 #ifndef UTILS_TAIL_MATCH_H
37 #define UTILS_TAIL_MATCH_H 1
39 #include "utils/latency/latency_config.h"
40 #include "utils/match/match.h"
42 struct cu_tail_match_s;
43 typedef struct cu_tail_match_s cu_tail_match_t;
50 * Allocates, initializes and returns a new `cu_tail_match_t' object.
53 * `filename' The name to read data from.
56 * Returns NULL upon failure, non-NULL otherwise.
58 cu_tail_match_t *tail_match_create(const char *filename);
65 * Releases resources used by the `cu_tail_match_t' object.
68 * The object to destroy.
70 void tail_match_destroy(cu_tail_match_t *obj);
74 * tail_match_add_match
77 * Adds a match, in form of a `cu_match_t' object, to the object.
78 * After data has been read from the logfile (using utils_tail) the callback
79 * function `submit_match' is called with the match object and the user
81 * Please note that his function is called regardless whether this match
82 * matched any lines recently or not.
83 * When `tail_match_destroy' is called the `user_data' pointer is freed using
84 * the `free_user_data' callback - if it is not NULL.
85 * When using this interface the `tail_match' module doesn't dispatch any
86 * values itself - all that has to happen in either the match-callbacks or
87 * the submit_match callback.
90 * Zero upon success, non-zero otherwise.
92 int tail_match_add_match(cu_tail_match_t *obj, cu_match_t *match,
93 int (*submit_match)(cu_match_t *match,
96 void (*free_user_data)(void *user_data));
100 * tail_match_add_match_simple
103 * A simplified version of `tail_match_add_match'. The regular expression
104 * `regex' must match a number, which is then dispatched according to
106 * See the `match_create_simple' function in utils_match.h for a description
107 * how this flag effects calculation of a new value.
108 * The values gathered are dispatched by the tail_match module in this case.
109 * The passed `plugin', `plugin_instance', `type', and `type_instance' are
110 * directly used when submitting these values.
111 * With excluderegex it is possible to exlude lines from the match.
112 * The `latency_cfg' specifies configuration for submitting latency.
115 * Zero upon success, non-zero otherwise.
117 int tail_match_add_match_simple(cu_tail_match_t *obj, const char *regex,
118 const char *excluderegex, int ds_type,
119 const char *plugin, const char *plugin_instance,
120 const char *type, const char *type_instance,
121 const latency_config_t latency_cfg);
128 * This function should be called periodically by plugins. It reads new lines
129 * from the logfile using `utils_tail' and tries to match them using all
130 * added `utils_match' objects.
131 * After all lines have been read and processed, the submit_match callback is
132 * called or, in case of tail_match_add_match_simple, the data is dispatched
133 * to the daemon directly.
136 * Zero on success, nonzero on failure.
138 int tail_match_read(cu_tail_match_t *obj);
140 #endif /* UTILS_TAIL_MATCH_H */