1 #ifndef PLUGIN_H
2 #define PLUGIN_H
3 /**
4 * collectd - src/plugin.h
5 * Copyright (C) 2005-2008 Florian octo Forster
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Sebastian Harl <sh at tokkee.org>
23 **/
25 #include "collectd.h"
26 #include "configfile.h"
27 #include "meta_data.h"
29 #define PLUGIN_FLAGS_GLOBAL 0x0001
31 #define DATA_MAX_NAME_LEN 64
33 #define DS_TYPE_COUNTER 0
34 #define DS_TYPE_GAUGE 1
35 #define DS_TYPE_DERIVE 2
36 #define DS_TYPE_ABSOLUTE 3
38 #define DS_TYPE_TO_STRING(t) (t == DS_TYPE_COUNTER) ? "counter" : \
39 (t == DS_TYPE_GAUGE) ? "gauge" : \
40 (t == DS_TYPE_DERIVE) ? "derive" : \
41 (t == DS_TYPE_ABSOLUTE) ? "absolute" : \
42 "unknown"
45 #ifndef LOG_ERR
46 # define LOG_ERR 3
47 #endif
48 #ifndef LOG_WARNING
49 # define LOG_WARNING 4
50 #endif
51 #ifndef LOG_NOTICE
52 # define LOG_NOTICE 5
53 #endif
54 #ifndef LOG_INFO
55 # define LOG_INFO 6
56 #endif
57 #ifndef LOG_DEBUG
58 # define LOG_DEBUG 7
59 #endif
61 #define NOTIF_MAX_MSG_LEN 256
63 #define NOTIF_FAILURE 1
64 #define NOTIF_WARNING 2
65 #define NOTIF_OKAY 4
67 /*
68 * Public data types
69 */
70 typedef unsigned long long counter_t;
71 typedef double gauge_t;
72 typedef int64_t derive_t;
73 typedef uint64_t absolute_t;
75 union value_u
76 {
77 counter_t counter;
78 gauge_t gauge;
79 derive_t derive;
80 absolute_t absolute;
81 };
82 typedef union value_u value_t;
84 struct value_list_s
85 {
86 value_t *values;
87 int values_len;
88 time_t time;
89 int interval;
90 char host[DATA_MAX_NAME_LEN];
91 char plugin[DATA_MAX_NAME_LEN];
92 char plugin_instance[DATA_MAX_NAME_LEN];
93 char type[DATA_MAX_NAME_LEN];
94 char type_instance[DATA_MAX_NAME_LEN];
95 meta_data_t *meta;
96 };
97 typedef struct value_list_s value_list_t;
99 #define VALUE_LIST_INIT { NULL, 0, 0, interval_g, "localhost", "", "", "", "", NULL }
100 #define VALUE_LIST_STATIC { NULL, 0, 0, 0, "localhost", "", "", "", "", NULL }
102 struct data_source_s
103 {
104 char name[DATA_MAX_NAME_LEN];
105 int type;
106 double min;
107 double max;
108 };
109 typedef struct data_source_s data_source_t;
111 struct data_set_s
112 {
113 char type[DATA_MAX_NAME_LEN];
114 int ds_num;
115 data_source_t *ds;
116 };
117 typedef struct data_set_s data_set_t;
119 enum notification_meta_type_e
120 {
121 NM_TYPE_STRING,
122 NM_TYPE_SIGNED_INT,
123 NM_TYPE_UNSIGNED_INT,
124 NM_TYPE_DOUBLE,
125 NM_TYPE_BOOLEAN
126 };
128 typedef struct notification_meta_s
129 {
130 char name[DATA_MAX_NAME_LEN];
131 enum notification_meta_type_e type;
132 union
133 {
134 const char *nm_string;
135 int64_t nm_signed_int;
136 uint64_t nm_unsigned_int;
137 double nm_double;
138 bool nm_boolean;
139 } nm_value;
140 struct notification_meta_s *next;
141 } notification_meta_t;
143 typedef struct notification_s
144 {
145 int severity;
146 time_t time;
147 char message[NOTIF_MAX_MSG_LEN];
148 char host[DATA_MAX_NAME_LEN];
149 char plugin[DATA_MAX_NAME_LEN];
150 char plugin_instance[DATA_MAX_NAME_LEN];
151 char type[DATA_MAX_NAME_LEN];
152 char type_instance[DATA_MAX_NAME_LEN];
153 notification_meta_t *meta;
154 } notification_t;
156 struct user_data_s
157 {
158 void *data;
159 void (*free_func) (void *);
160 };
161 typedef struct user_data_s user_data_t;
163 /*
164 * Callback types
165 */
166 typedef int (*plugin_init_cb) (void);
167 typedef int (*plugin_read_cb) (user_data_t *);
168 typedef int (*plugin_write_cb) (const data_set_t *, const value_list_t *,
169 user_data_t *);
170 typedef int (*plugin_flush_cb) (int timeout, const char *identifier,
171 user_data_t *);
172 typedef void (*plugin_log_cb) (int severity, const char *message,
173 user_data_t *);
174 typedef int (*plugin_shutdown_cb) (void);
175 typedef int (*plugin_notification_cb) (const notification_t *,
176 user_data_t *);
178 /*
179 * NAME
180 * plugin_set_dir
181 *
182 * DESCRIPTION
183 * Sets the current `plugindir'
184 *
185 * ARGUMENTS
186 * `dir' Path to the plugin directory
187 *
188 * NOTES
189 * If `dir' is NULL the compiled in default `PLUGINDIR' is used.
190 */
191 void plugin_set_dir (const char *dir);
193 /*
194 * NAME
195 * plugin_load
196 *
197 * DESCRIPTION
198 * Searches the current `plugindir' (see `plugin_set_dir') for the plugin
199 * named $type and loads it. Afterwards the plugin's `module_register'
200 * function is called, which then calls `plugin_register' to register callback
201 * functions.
202 *
203 * ARGUMENTS
204 * `name' Name of the plugin to load.
205 * `flags' Hints on how to handle this plugin.
206 *
207 * RETURN VALUE
208 * Returns zero upon success, a value greater than zero if no plugin was found
209 * and a value below zero if an error occurs.
210 *
211 * NOTES
212 * No attempt is made to re-load an already loaded module.
213 */
214 int plugin_load (const char *name, uint32_t flags);
216 void plugin_init_all (void);
217 void plugin_read_all (void);
218 int plugin_read_all_once (void);
219 void plugin_shutdown_all (void);
221 /*
222 * NAME
223 * plugin_write
224 *
225 * DESCRIPTION
226 * Calls the write function of the given plugin with the provided data set and
227 * value list. It differs from `plugin_dispatch_value' in that it does not
228 * update the cache, does not do threshold checking, call the chain subsystem
229 * and so on. It looks up the requested plugin and invokes the function, end
230 * of story.
231 *
232 * ARGUMENTS
233 * plugin Name of the plugin. If NULL, the value is sent to all registered
234 * write functions.
235 * ds Pointer to the data_set_t structure. If NULL, the data set is
236 * looked up according to the `type' member in the `vl' argument.
237 * vl The actual value to be processed. Must not be NULL.
238 *
239 * RETURN VALUE
240 * Returns zero upon success or non-zero if an error occurred. If `plugin' is
241 * NULL and more than one plugin is called, an error is only returned if *all*
242 * plugins fail.
243 *
244 * NOTES
245 * This is the function used by the `write' built-in target. May be used by
246 * other target plugins.
247 */
248 int plugin_write (const char *plugin,
249 const data_set_t *ds, const value_list_t *vl);
251 int plugin_flush (const char *plugin, int timeout, const char *identifier);
253 /*
254 * The `plugin_register_*' functions are used to make `config', `init',
255 * `read', `write' and `shutdown' functions known to the plugin
256 * infrastructure. Also, the data-formats are made public like this.
257 */
258 int plugin_register_config (const char *name,
259 int (*callback) (const char *key, const char *val),
260 const char **keys, int keys_num);
261 int plugin_register_complex_config (const char *type,
262 int (*callback) (oconfig_item_t *));
263 int plugin_register_init (const char *name,
264 plugin_init_cb callback);
265 int plugin_register_read (const char *name,
266 int (*callback) (void));
267 int plugin_register_complex_read (const char *group, const char *name,
268 plugin_read_cb callback,
269 const struct timespec *interval,
270 user_data_t *user_data);
271 int plugin_register_write (const char *name,
272 plugin_write_cb callback, user_data_t *user_data);
273 int plugin_register_flush (const char *name,
274 plugin_flush_cb callback, user_data_t *user_data);
275 int plugin_register_shutdown (char *name,
276 plugin_shutdown_cb callback);
277 int plugin_register_data_set (const data_set_t *ds);
278 int plugin_register_log (const char *name,
279 plugin_log_cb callback, user_data_t *user_data);
280 int plugin_register_notification (const char *name,
281 plugin_notification_cb callback, user_data_t *user_data);
283 int plugin_unregister_config (const char *name);
284 int plugin_unregister_complex_config (const char *name);
285 int plugin_unregister_init (const char *name);
286 int plugin_unregister_read (const char *name);
287 int plugin_unregister_read_group (const char *group);
288 int plugin_unregister_write (const char *name);
289 int plugin_unregister_flush (const char *name);
290 int plugin_unregister_shutdown (const char *name);
291 int plugin_unregister_data_set (const char *name);
292 int plugin_unregister_log (const char *name);
293 int plugin_unregister_notification (const char *name);
296 /*
297 * NAME
298 * plugin_dispatch_values
299 *
300 * DESCRIPTION
301 * This function is called by reading processes with the values they've
302 * aquired. The function fetches the data-set definition (that has been
303 * registered using `plugin_register_data_set') and calls _all_ registered
304 * write-functions.
305 *
306 * ARGUMENTS
307 * `vl' Value list of the values that have been read by a `read'
308 * function.
309 */
310 int plugin_dispatch_values (value_list_t *vl);
312 int plugin_dispatch_notification (const notification_t *notif);
314 void plugin_log (int level, const char *format, ...)
315 __attribute__ ((format(printf,2,3)));
317 #define ERROR(...) plugin_log (LOG_ERR, __VA_ARGS__)
318 #define WARNING(...) plugin_log (LOG_WARNING, __VA_ARGS__)
319 #define NOTICE(...) plugin_log (LOG_NOTICE, __VA_ARGS__)
320 #define INFO(...) plugin_log (LOG_INFO, __VA_ARGS__)
321 #if COLLECT_DEBUG
322 # define DEBUG(...) plugin_log (LOG_DEBUG, __VA_ARGS__)
323 #else /* COLLECT_DEBUG */
324 # define DEBUG(...) /* noop */
325 #endif /* ! COLLECT_DEBUG */
327 const data_set_t *plugin_get_ds (const char *name);
329 int plugin_notification_meta_add_string (notification_t *n,
330 const char *name,
331 const char *value);
332 int plugin_notification_meta_add_signed_int (notification_t *n,
333 const char *name,
334 int64_t value);
335 int plugin_notification_meta_add_unsigned_int (notification_t *n,
336 const char *name,
337 uint64_t value);
338 int plugin_notification_meta_add_double (notification_t *n,
339 const char *name,
340 double value);
341 int plugin_notification_meta_add_boolean (notification_t *n,
342 const char *name,
343 bool value);
345 int plugin_notification_meta_copy (notification_t *dst,
346 const notification_t *src);
348 int plugin_notification_meta_free (notification_meta_t *n);
350 #endif /* PLUGIN_H */