1 #ifndef PLUGIN_H
2 #define PLUGIN_H
3 /**
4 * collectd - src/plugin.h
5 * Copyright (C) 2005-2010 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 collectd.org>
22 * Sebastian Harl <sh at tokkee.org>
23 **/
25 #include "collectd.h"
26 #include "configfile.h"
27 #include "meta_data.h"
28 #include "utils_time.h"
30 #define PLUGIN_FLAGS_GLOBAL 0x0001
32 #define DATA_MAX_NAME_LEN 64
34 #define DS_TYPE_COUNTER 0
35 #define DS_TYPE_GAUGE 1
36 #define DS_TYPE_DERIVE 2
37 #define DS_TYPE_ABSOLUTE 3
39 #define DS_TYPE_TO_STRING(t) (t == DS_TYPE_COUNTER) ? "counter" : \
40 (t == DS_TYPE_GAUGE) ? "gauge" : \
41 (t == DS_TYPE_DERIVE) ? "derive" : \
42 (t == DS_TYPE_ABSOLUTE) ? "absolute" : \
43 "unknown"
46 #ifndef LOG_ERR
47 # define LOG_ERR 3
48 #endif
49 #ifndef LOG_WARNING
50 # define LOG_WARNING 4
51 #endif
52 #ifndef LOG_NOTICE
53 # define LOG_NOTICE 5
54 #endif
55 #ifndef LOG_INFO
56 # define LOG_INFO 6
57 #endif
58 #ifndef LOG_DEBUG
59 # define LOG_DEBUG 7
60 #endif
62 #define NOTIF_MAX_MSG_LEN 256
64 #define NOTIF_FAILURE 1
65 #define NOTIF_WARNING 2
66 #define NOTIF_OKAY 4
68 /*
69 * Public data types
70 */
71 struct plugin_loaddata_s
72 {
73 cdtime_t interval;
74 };
75 typedef struct plugin_loaddata_s plugin_loaddata_t;
76 static cdtime_t __attribute__((unused)) plugin_interval = 0;
78 typedef unsigned long long counter_t;
79 typedef double gauge_t;
80 typedef int64_t derive_t;
81 typedef uint64_t absolute_t;
83 union value_u
84 {
85 counter_t counter;
86 gauge_t gauge;
87 derive_t derive;
88 absolute_t absolute;
89 };
90 typedef union value_u value_t;
92 struct value_list_s
93 {
94 value_t *values;
95 int values_len;
96 cdtime_t time;
97 cdtime_t interval;
98 char host[DATA_MAX_NAME_LEN];
99 char plugin[DATA_MAX_NAME_LEN];
100 char plugin_instance[DATA_MAX_NAME_LEN];
101 char type[DATA_MAX_NAME_LEN];
102 char type_instance[DATA_MAX_NAME_LEN];
103 meta_data_t *meta;
104 };
105 typedef struct value_list_s value_list_t;
107 #define VALUE_LIST_INIT(interval) { NULL, 0, 0, (interval), "localhost", "", "", "", "", NULL }
108 #define VALUE_LIST_STATIC { NULL, 0, 0, 0, "localhost", "", "", "", "", NULL }
110 struct data_source_s
111 {
112 char name[DATA_MAX_NAME_LEN];
113 int type;
114 double min;
115 double max;
116 };
117 typedef struct data_source_s data_source_t;
119 struct data_set_s
120 {
121 char type[DATA_MAX_NAME_LEN];
122 int ds_num;
123 data_source_t *ds;
124 };
125 typedef struct data_set_s data_set_t;
127 enum notification_meta_type_e
128 {
129 NM_TYPE_STRING,
130 NM_TYPE_SIGNED_INT,
131 NM_TYPE_UNSIGNED_INT,
132 NM_TYPE_DOUBLE,
133 NM_TYPE_BOOLEAN
134 };
136 typedef struct notification_meta_s
137 {
138 char name[DATA_MAX_NAME_LEN];
139 enum notification_meta_type_e type;
140 union
141 {
142 const char *nm_string;
143 int64_t nm_signed_int;
144 uint64_t nm_unsigned_int;
145 double nm_double;
146 _Bool nm_boolean;
147 } nm_value;
148 struct notification_meta_s *next;
149 } notification_meta_t;
151 typedef struct notification_s
152 {
153 int severity;
154 cdtime_t time;
155 char message[NOTIF_MAX_MSG_LEN];
156 char host[DATA_MAX_NAME_LEN];
157 char plugin[DATA_MAX_NAME_LEN];
158 char plugin_instance[DATA_MAX_NAME_LEN];
159 char type[DATA_MAX_NAME_LEN];
160 char type_instance[DATA_MAX_NAME_LEN];
161 notification_meta_t *meta;
162 } notification_t;
164 struct user_data_s
165 {
166 void *data;
167 void (*free_func) (void *);
168 };
169 typedef struct user_data_s user_data_t;
171 /*
172 * Callback types
173 */
174 typedef int (*plugin_init_cb) (void);
175 typedef int (*plugin_read_cb) (user_data_t *);
176 typedef int (*plugin_write_cb) (const data_set_t *, const value_list_t *,
177 user_data_t *);
178 typedef int (*plugin_flush_cb) (cdtime_t timeout, const char *identifier,
179 user_data_t *);
180 /* "missing" callback. Returns less than zero on failure, zero if other
181 * callbacks should be called, greater than zero if no more callbacks should be
182 * called. */
183 typedef int (*plugin_missing_cb) (const value_list_t *, user_data_t *);
184 typedef void (*plugin_log_cb) (int severity, const char *message,
185 user_data_t *);
186 typedef int (*plugin_shutdown_cb) (void);
187 typedef int (*plugin_notification_cb) (const notification_t *,
188 user_data_t *);
190 /*
191 * NAME
192 * plugin_set_dir
193 *
194 * DESCRIPTION
195 * Sets the current `plugindir'
196 *
197 * ARGUMENTS
198 * `dir' Path to the plugin directory
199 *
200 * NOTES
201 * If `dir' is NULL the compiled in default `PLUGINDIR' is used.
202 */
203 void plugin_set_dir (const char *dir);
205 /*
206 * NAME
207 * plugin_load
208 *
209 * DESCRIPTION
210 * Searches the current `plugindir' (see `plugin_set_dir') for the plugin
211 * named $type and loads it. Afterwards the plugin's `module_register'
212 * function is called, which then calls `plugin_register' to register callback
213 * functions.
214 *
215 * ARGUMENTS
216 * `name' Name of the plugin to load.
217 * `flags' Hints on how to handle this plugin.
218 * `data' Additional arguments to pass to the plugin.
219 *
220 * RETURN VALUE
221 * Returns zero upon success, a value greater than zero if no plugin was found
222 * and a value below zero if an error occurs.
223 *
224 * NOTES
225 * No attempt is made to re-load an already loaded module.
226 */
227 int plugin_load (const char *name, uint32_t flags, plugin_loaddata_t *data);
229 /*
230 * NAME
231 * PLUGIN_INIT_INTERVAL
232 *
233 * DESCRIPTION
234 * Initialize the plugin specific interval settings.
235 *
236 * ARGUMENTS
237 * `data' Data provided by LoadPlugin, like custom interval settings.
238 */
239 #define PLUGIN_INIT_INTERVAL(data) \
240 do { \
241 if ((data)->interval != 0) \
242 plugin_interval = (data)->interval; \
243 } while (0)
245 void plugin_init_all (void);
246 void plugin_read_all (void);
247 int plugin_read_all_once (void);
248 void plugin_shutdown_all (void);
250 /*
251 * NAME
252 * plugin_write
253 *
254 * DESCRIPTION
255 * Calls the write function of the given plugin with the provided data set and
256 * value list. It differs from `plugin_dispatch_value' in that it does not
257 * update the cache, does not do threshold checking, call the chain subsystem
258 * and so on. It looks up the requested plugin and invokes the function, end
259 * of story.
260 *
261 * ARGUMENTS
262 * plugin Name of the plugin. If NULL, the value is sent to all registered
263 * write functions.
264 * ds Pointer to the data_set_t structure. If NULL, the data set is
265 * looked up according to the `type' member in the `vl' argument.
266 * vl The actual value to be processed. Must not be NULL.
267 *
268 * RETURN VALUE
269 * Returns zero upon success or non-zero if an error occurred. If `plugin' is
270 * NULL and more than one plugin is called, an error is only returned if *all*
271 * plugins fail.
272 *
273 * NOTES
274 * This is the function used by the `write' built-in target. May be used by
275 * other target plugins.
276 */
277 int plugin_write (const char *plugin,
278 const data_set_t *ds, const value_list_t *vl);
280 int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier);
282 /*
283 * The `plugin_register_*' functions are used to make `config', `init',
284 * `read', `write' and `shutdown' functions known to the plugin
285 * infrastructure. Also, the data-formats are made public like this.
286 */
287 int plugin_register_config (const char *name,
288 int (*callback) (const char *key, const char *val),
289 const char **keys, int keys_num);
290 int plugin_register_complex_config (const char *type,
291 int (*callback) (oconfig_item_t *));
292 int plugin_register_init (const char *name,
293 plugin_init_cb callback);
294 int plugin_register_read (const char *name,
295 int (*callback) (void), cdtime_t interval);
296 /* "user_data" will be freed automatically, unless
297 * "plugin_register_complex_read" returns an error (non-zero). */
298 int plugin_register_complex_read (const char *group, const char *name,
299 plugin_read_cb callback,
300 const struct timespec *interval,
301 user_data_t *user_data);
302 int plugin_register_write (const char *name,
303 plugin_write_cb callback, user_data_t *user_data);
304 int plugin_register_flush (const char *name,
305 plugin_flush_cb callback, user_data_t *user_data);
306 int plugin_register_missing (const char *name,
307 plugin_missing_cb callback, user_data_t *user_data);
308 int plugin_register_shutdown (const char *name,
309 plugin_shutdown_cb callback);
310 int plugin_register_data_set (const data_set_t *ds);
311 int plugin_register_log (const char *name,
312 plugin_log_cb callback, user_data_t *user_data);
313 int plugin_register_notification (const char *name,
314 plugin_notification_cb callback, user_data_t *user_data);
316 int plugin_unregister_config (const char *name);
317 int plugin_unregister_complex_config (const char *name);
318 int plugin_unregister_init (const char *name);
319 int plugin_unregister_read (const char *name);
320 int plugin_unregister_read_group (const char *group);
321 int plugin_unregister_write (const char *name);
322 int plugin_unregister_flush (const char *name);
323 int plugin_unregister_missing (const char *name);
324 int plugin_unregister_shutdown (const char *name);
325 int plugin_unregister_data_set (const char *name);
326 int plugin_unregister_log (const char *name);
327 int plugin_unregister_notification (const char *name);
330 /*
331 * NAME
332 * plugin_dispatch_values
333 *
334 * DESCRIPTION
335 * This function is called by reading processes with the values they've
336 * aquired. The function fetches the data-set definition (that has been
337 * registered using `plugin_register_data_set') and calls _all_ registered
338 * write-functions.
339 *
340 * ARGUMENTS
341 * `vl' Value list of the values that have been read by a `read'
342 * function.
343 */
344 int plugin_dispatch_values (value_list_t *vl);
345 int plugin_dispatch_missing (const value_list_t *vl);
347 int plugin_dispatch_notification (const notification_t *notif);
349 void plugin_log (int level, const char *format, ...)
350 __attribute__ ((format(printf,2,3)));
352 #define ERROR(...) plugin_log (LOG_ERR, __VA_ARGS__)
353 #define WARNING(...) plugin_log (LOG_WARNING, __VA_ARGS__)
354 #define NOTICE(...) plugin_log (LOG_NOTICE, __VA_ARGS__)
355 #define INFO(...) plugin_log (LOG_INFO, __VA_ARGS__)
356 #if COLLECT_DEBUG
357 # define DEBUG(...) plugin_log (LOG_DEBUG, __VA_ARGS__)
358 #else /* COLLECT_DEBUG */
359 # define DEBUG(...) /* noop */
360 #endif /* ! COLLECT_DEBUG */
362 const data_set_t *plugin_get_ds (const char *name);
364 int plugin_notification_meta_add_string (notification_t *n,
365 const char *name,
366 const char *value);
367 int plugin_notification_meta_add_signed_int (notification_t *n,
368 const char *name,
369 int64_t value);
370 int plugin_notification_meta_add_unsigned_int (notification_t *n,
371 const char *name,
372 uint64_t value);
373 int plugin_notification_meta_add_double (notification_t *n,
374 const char *name,
375 double value);
376 int plugin_notification_meta_add_boolean (notification_t *n,
377 const char *name,
378 _Bool value);
380 int plugin_notification_meta_copy (notification_t *dst,
381 const notification_t *src);
383 int plugin_notification_meta_free (notification_meta_t *n);
385 #endif /* PLUGIN_H */