1 /**
2 * collectd - src/plugin.c
3 * Copyright (C) 2005-2013 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; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at collectd.org>
20 * Sebastian Harl <sh at tokkee.org>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
27 #include "filter_chain.h"
28 #include "utils_avltree.h"
29 #include "utils_cache.h"
30 #include "utils_complain.h"
31 #include "utils_llist.h"
32 #include "utils_heap.h"
33 #include "utils_time.h"
35 #if HAVE_PTHREAD_H
36 # include <pthread.h>
37 #endif
39 #include <ltdl.h>
41 /*
42 * Private structures
43 */
44 struct callback_func_s
45 {
46 void *cf_callback;
47 user_data_t cf_udata;
48 plugin_ctx_t cf_ctx;
49 };
50 typedef struct callback_func_s callback_func_t;
52 #define RF_SIMPLE 0
53 #define RF_COMPLEX 1
54 #define RF_REMOVE 65535
55 struct read_func_s
56 {
57 /* `read_func_t' "inherits" from `callback_func_t'.
58 * The `rf_super' member MUST be the first one in this structure! */
59 #define rf_callback rf_super.cf_callback
60 #define rf_udata rf_super.cf_udata
61 #define rf_ctx rf_super.cf_ctx
62 callback_func_t rf_super;
63 char rf_group[DATA_MAX_NAME_LEN];
64 char *rf_name;
65 int rf_type;
66 cdtime_t rf_interval;
67 cdtime_t rf_effective_interval;
68 cdtime_t rf_next_read;
69 };
70 typedef struct read_func_s read_func_t;
72 struct write_queue_s;
73 typedef struct write_queue_s write_queue_t;
74 struct write_queue_s
75 {
76 value_list_t *vl;
77 plugin_ctx_t ctx;
78 write_queue_t *next;
79 };
81 /*
82 * Private variables
83 */
84 static c_avl_tree_t *plugins_loaded = NULL;
86 static llist_t *list_init;
87 static llist_t *list_write;
88 static llist_t *list_flush;
89 static llist_t *list_missing;
90 static llist_t *list_shutdown;
91 static llist_t *list_log;
92 static llist_t *list_notification;
94 static fc_chain_t *pre_cache_chain = NULL;
95 static fc_chain_t *post_cache_chain = NULL;
97 static c_avl_tree_t *data_sets;
99 static char *plugindir = NULL;
101 static c_heap_t *read_heap = NULL;
102 static llist_t *read_list;
103 static int read_loop = 1;
104 static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
105 static pthread_cond_t read_cond = PTHREAD_COND_INITIALIZER;
106 static pthread_t *read_threads = NULL;
107 static int read_threads_num = 0;
109 static write_queue_t *write_queue_head;
110 static write_queue_t *write_queue_tail;
111 static _Bool write_loop = 1;
112 static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
113 static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER;
114 static pthread_t *write_threads = NULL;
115 static size_t write_threads_num = 0;
117 static pthread_key_t plugin_ctx_key;
118 static _Bool plugin_ctx_key_initialized = 0;
120 /*
121 * Static functions
122 */
123 static int plugin_dispatch_values_internal (value_list_t *vl);
125 static const char *plugin_get_dir (void)
126 {
127 if (plugindir == NULL)
128 return (PLUGINDIR);
129 else
130 return (plugindir);
131 }
133 static void destroy_callback (callback_func_t *cf) /* {{{ */
134 {
135 if (cf == NULL)
136 return;
138 if ((cf->cf_udata.data != NULL) && (cf->cf_udata.free_func != NULL))
139 {
140 cf->cf_udata.free_func (cf->cf_udata.data);
141 cf->cf_udata.data = NULL;
142 cf->cf_udata.free_func = NULL;
143 }
144 sfree (cf);
145 } /* }}} void destroy_callback */
147 static void destroy_all_callbacks (llist_t **list) /* {{{ */
148 {
149 llentry_t *le;
151 if (*list == NULL)
152 return;
154 le = llist_head (*list);
155 while (le != NULL)
156 {
157 llentry_t *le_next;
159 le_next = le->next;
161 sfree (le->key);
162 destroy_callback (le->value);
163 le->value = NULL;
165 le = le_next;
166 }
168 llist_destroy (*list);
169 *list = NULL;
170 } /* }}} void destroy_all_callbacks */
172 static void destroy_read_heap (void) /* {{{ */
173 {
174 if (read_heap == NULL)
175 return;
177 while (42)
178 {
179 callback_func_t *cf;
181 cf = c_heap_get_root (read_heap);
182 if (cf == NULL)
183 break;
185 destroy_callback (cf);
186 }
188 c_heap_destroy (read_heap);
189 read_heap = NULL;
190 } /* }}} void destroy_read_heap */
192 static int register_callback (llist_t **list, /* {{{ */
193 const char *name, callback_func_t *cf)
194 {
195 llentry_t *le;
196 char *key;
198 if (*list == NULL)
199 {
200 *list = llist_create ();
201 if (*list == NULL)
202 {
203 ERROR ("plugin: register_callback: "
204 "llist_create failed.");
205 destroy_callback (cf);
206 return (-1);
207 }
208 }
210 key = strdup (name);
211 if (key == NULL)
212 {
213 ERROR ("plugin: register_callback: strdup failed.");
214 destroy_callback (cf);
215 return (-1);
216 }
218 le = llist_search (*list, name);
219 if (le == NULL)
220 {
221 le = llentry_create (key, cf);
222 if (le == NULL)
223 {
224 ERROR ("plugin: register_callback: "
225 "llentry_create failed.");
226 free (key);
227 destroy_callback (cf);
228 return (-1);
229 }
231 llist_append (*list, le);
232 }
233 else
234 {
235 callback_func_t *old_cf;
237 old_cf = le->value;
238 le->value = cf;
240 WARNING ("plugin: register_callback: "
241 "a callback named `%s' already exists - "
242 "overwriting the old entry!", name);
244 destroy_callback (old_cf);
245 sfree (key);
246 }
248 return (0);
249 } /* }}} int register_callback */
251 static int create_register_callback (llist_t **list, /* {{{ */
252 const char *name, void *callback, user_data_t *ud)
253 {
254 callback_func_t *cf;
256 cf = (callback_func_t *) malloc (sizeof (*cf));
257 if (cf == NULL)
258 {
259 ERROR ("plugin: create_register_callback: malloc failed.");
260 return (-1);
261 }
262 memset (cf, 0, sizeof (*cf));
264 cf->cf_callback = callback;
265 if (ud == NULL)
266 {
267 cf->cf_udata.data = NULL;
268 cf->cf_udata.free_func = NULL;
269 }
270 else
271 {
272 cf->cf_udata = *ud;
273 }
275 cf->cf_ctx = plugin_get_ctx ();
277 return (register_callback (list, name, cf));
278 } /* }}} int create_register_callback */
280 static int plugin_unregister (llist_t *list, const char *name) /* {{{ */
281 {
282 llentry_t *e;
284 if (list == NULL)
285 return (-1);
287 e = llist_search (list, name);
288 if (e == NULL)
289 return (-1);
291 llist_remove (list, e);
293 sfree (e->key);
294 destroy_callback (e->value);
296 llentry_destroy (e);
298 return (0);
299 } /* }}} int plugin_unregister */
301 /*
302 * (Try to) load the shared object `file'. Won't complain if it isn't a shared
303 * object, but it will bitch about a shared object not having a
304 * ``module_register'' symbol..
305 */
306 static int plugin_load_file (char *file, uint32_t flags)
307 {
308 lt_dlhandle dlh;
309 void (*reg_handle) (void);
311 lt_dlinit ();
312 lt_dlerror (); /* clear errors */
314 #if LIBTOOL_VERSION == 2
315 if (flags & PLUGIN_FLAGS_GLOBAL) {
316 lt_dladvise advise;
317 lt_dladvise_init(&advise);
318 lt_dladvise_global(&advise);
319 dlh = lt_dlopenadvise(file, advise);
320 lt_dladvise_destroy(&advise);
321 } else {
322 dlh = lt_dlopen (file);
323 }
324 #else /* if LIBTOOL_VERSION == 1 */
325 if (flags & PLUGIN_FLAGS_GLOBAL)
326 WARNING ("plugin_load_file: The global flag is not supported, "
327 "libtool 2 is required for this.");
328 dlh = lt_dlopen (file);
329 #endif
331 if (dlh == NULL)
332 {
333 char errbuf[1024] = "";
335 ssnprintf (errbuf, sizeof (errbuf),
336 "lt_dlopen (\"%s\") failed: %s. "
337 "The most common cause for this problem are "
338 "missing dependencies. Use ldd(1) to check "
339 "the dependencies of the plugin "
340 "/ shared object.",
341 file, lt_dlerror ());
343 ERROR ("%s", errbuf);
344 /* Make sure this is printed to STDERR in any case, but also
345 * make sure it's printed only once. */
346 if (list_log != NULL)
347 fprintf (stderr, "ERROR: %s\n", errbuf);
349 return (1);
350 }
352 if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
353 {
354 WARNING ("Couldn't find symbol \"module_register\" in \"%s\": %s\n",
355 file, lt_dlerror ());
356 lt_dlclose (dlh);
357 return (-1);
358 }
360 (*reg_handle) ();
362 return (0);
363 }
365 static void *plugin_read_thread (void __attribute__((unused)) *args)
366 {
367 while (read_loop != 0)
368 {
369 read_func_t *rf;
370 plugin_ctx_t old_ctx;
371 cdtime_t now;
372 int status;
373 int rf_type;
374 int rc;
376 /* Get the read function that needs to be read next.
377 * We don't need to hold "read_lock" for the heap, but we need
378 * to call c_heap_get_root() and pthread_cond_wait() in the
379 * same protected block. */
380 pthread_mutex_lock (&read_lock);
381 rf = c_heap_get_root (read_heap);
382 if (rf == NULL)
383 {
384 pthread_cond_wait (&read_cond, &read_lock);
385 pthread_mutex_unlock (&read_lock);
386 continue;
387 }
388 pthread_mutex_unlock (&read_lock);
390 if (rf->rf_interval == 0)
391 {
392 /* this should not happen, because the interval is set
393 * for each plugin when loading it
394 * XXX: issue a warning? */
395 rf->rf_interval = plugin_get_interval ();
396 rf->rf_effective_interval = rf->rf_interval;
398 rf->rf_next_read = cdtime ();
399 }
401 /* sleep until this entry is due,
402 * using pthread_cond_timedwait */
403 pthread_mutex_lock (&read_lock);
404 /* In pthread_cond_timedwait, spurious wakeups are possible
405 * (and really happen, at least on NetBSD with > 1 CPU), thus
406 * we need to re-evaluate the condition every time
407 * pthread_cond_timedwait returns. */
408 rc = 0;
409 while ((read_loop != 0)
410 && (cdtime () < rf->rf_next_read)
411 && rc == 0)
412 {
413 struct timespec ts = { 0 };
415 CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
417 rc = pthread_cond_timedwait (&read_cond, &read_lock,
418 &ts);
419 }
421 /* Must hold `read_lock' when accessing `rf->rf_type'. */
422 rf_type = rf->rf_type;
423 pthread_mutex_unlock (&read_lock);
425 /* Check if we're supposed to stop.. This may have interrupted
426 * the sleep, too. */
427 if (read_loop == 0)
428 {
429 /* Insert `rf' again, so it can be free'd correctly */
430 c_heap_insert (read_heap, rf);
431 break;
432 }
434 /* The entry has been marked for deletion. The linked list
435 * entry has already been removed by `plugin_unregister_read'.
436 * All we have to do here is free the `read_func_t' and
437 * continue. */
438 if (rf_type == RF_REMOVE)
439 {
440 DEBUG ("plugin_read_thread: Destroying the `%s' "
441 "callback.", rf->rf_name);
442 sfree (rf->rf_name);
443 destroy_callback ((callback_func_t *) rf);
444 rf = NULL;
445 continue;
446 }
448 DEBUG ("plugin_read_thread: Handling `%s'.", rf->rf_name);
450 old_ctx = plugin_set_ctx (rf->rf_ctx);
452 if (rf_type == RF_SIMPLE)
453 {
454 int (*callback) (void);
456 callback = rf->rf_callback;
457 status = (*callback) ();
458 }
459 else
460 {
461 plugin_read_cb callback;
463 assert (rf_type == RF_COMPLEX);
465 callback = rf->rf_callback;
466 status = (*callback) (&rf->rf_udata);
467 }
469 plugin_set_ctx (old_ctx);
471 /* If the function signals failure, we will increase the
472 * intervals in which it will be called. */
473 if (status != 0)
474 {
475 rf->rf_effective_interval *= 2;
476 if (rf->rf_effective_interval > TIME_T_TO_CDTIME_T (86400))
477 rf->rf_effective_interval = TIME_T_TO_CDTIME_T (86400);
479 NOTICE ("read-function of plugin `%s' failed. "
480 "Will suspend it for %.3f seconds.",
481 rf->rf_name,
482 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
483 }
484 else
485 {
486 /* Success: Restore the interval, if it was changed. */
487 rf->rf_effective_interval = rf->rf_interval;
488 }
490 /* update the ``next read due'' field */
491 now = cdtime ();
493 DEBUG ("plugin_read_thread: Effective interval of the "
494 "%s plugin is %.3f seconds.",
495 rf->rf_name,
496 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
498 /* Calculate the next (absolute) time at which this function
499 * should be called. */
500 rf->rf_next_read += rf->rf_effective_interval;
502 /* Check, if `rf_next_read' is in the past. */
503 if (rf->rf_next_read < now)
504 {
505 /* `rf_next_read' is in the past. Insert `now'
506 * so this value doesn't trail off into the
507 * past too much. */
508 rf->rf_next_read = now;
509 }
511 DEBUG ("plugin_read_thread: Next read of the %s plugin at %.3f.",
512 rf->rf_name,
513 CDTIME_T_TO_DOUBLE (rf->rf_next_read));
515 /* Re-insert this read function into the heap again. */
516 c_heap_insert (read_heap, rf);
517 } /* while (read_loop) */
519 pthread_exit (NULL);
520 return ((void *) 0);
521 } /* void *plugin_read_thread */
523 static void start_read_threads (int num)
524 {
525 int i;
527 if (read_threads != NULL)
528 return;
530 read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
531 if (read_threads == NULL)
532 {
533 ERROR ("plugin: start_read_threads: calloc failed.");
534 return;
535 }
537 read_threads_num = 0;
538 for (i = 0; i < num; i++)
539 {
540 if (pthread_create (read_threads + read_threads_num, NULL,
541 plugin_read_thread, NULL) == 0)
542 {
543 read_threads_num++;
544 }
545 else
546 {
547 ERROR ("plugin: start_read_threads: pthread_create failed.");
548 return;
549 }
550 } /* for (i) */
551 } /* void start_read_threads */
553 static void stop_read_threads (void)
554 {
555 int i;
557 if (read_threads == NULL)
558 return;
560 INFO ("collectd: Stopping %i read threads.", read_threads_num);
562 pthread_mutex_lock (&read_lock);
563 read_loop = 0;
564 DEBUG ("plugin: stop_read_threads: Signalling `read_cond'");
565 pthread_cond_broadcast (&read_cond);
566 pthread_mutex_unlock (&read_lock);
568 for (i = 0; i < read_threads_num; i++)
569 {
570 if (pthread_join (read_threads[i], NULL) != 0)
571 {
572 ERROR ("plugin: stop_read_threads: pthread_join failed.");
573 }
574 read_threads[i] = (pthread_t) 0;
575 }
576 sfree (read_threads);
577 read_threads_num = 0;
578 } /* void stop_read_threads */
580 static void plugin_value_list_free (value_list_t *vl) /* {{{ */
581 {
582 if (vl == NULL)
583 return;
585 meta_data_destroy (vl->meta);
586 sfree (vl->values);
587 sfree (vl);
588 } /* }}} void plugin_value_list_free */
590 static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
591 {
592 value_list_t *vl;
594 if (vl_orig == NULL)
595 return (NULL);
597 vl = malloc (sizeof (*vl));
598 if (vl == NULL)
599 return (NULL);
600 memcpy (vl, vl_orig, sizeof (*vl));
602 vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
603 if (vl->values == NULL)
604 {
605 plugin_value_list_free (vl);
606 return (NULL);
607 }
608 memcpy (vl->values, vl_orig->values,
609 vl_orig->values_len * sizeof (*vl->values));
611 vl->meta = meta_data_clone (vl->meta);
612 if ((vl_orig->meta != NULL) && (vl->meta == NULL))
613 {
614 plugin_value_list_free (vl);
615 return (NULL);
616 }
618 if (vl->time == 0)
619 vl->time = cdtime ();
621 /* Fill in the interval from the thread context, if it is zero. */
622 if (vl->interval == 0)
623 {
624 plugin_ctx_t ctx = plugin_get_ctx ();
626 if (ctx.interval != 0)
627 vl->interval = ctx.interval;
628 else
629 {
630 char name[6 * DATA_MAX_NAME_LEN];
631 FORMAT_VL (name, sizeof (name), vl);
632 ERROR ("plugin_value_list_clone: Unable to determine "
633 "interval from context for "
634 "value list \"%s\". "
635 "This indicates a broken plugin. "
636 "Please report this problem to the "
637 "collectd mailing list or at "
638 "<http://collectd.org/bugs/>.", name);
639 vl->interval = cf_get_default_interval ();
640 }
641 }
643 return (vl);
644 } /* }}} value_list_t *plugin_value_list_clone */
646 static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
647 {
648 write_queue_t *q;
650 q = malloc (sizeof (*q));
651 if (q == NULL)
652 return (ENOMEM);
653 q->next = NULL;
655 q->vl = plugin_value_list_clone (vl);
656 if (q->vl == NULL)
657 {
658 sfree (q);
659 return (ENOMEM);
660 }
662 /* Store context of caller (read plugin); otherwise, it would not be
663 * available to the write plugins when actually dispatching the
664 * value-list later on. */
665 q->ctx = plugin_get_ctx ();
667 pthread_mutex_lock (&write_lock);
669 if (write_queue_tail == NULL)
670 {
671 write_queue_head = q;
672 write_queue_tail = q;
673 }
674 else
675 {
676 write_queue_tail->next = q;
677 write_queue_tail = q;
678 }
680 pthread_cond_signal (&write_cond);
681 pthread_mutex_unlock (&write_lock);
683 return (0);
684 } /* }}} int plugin_write_enqueue */
686 static value_list_t *plugin_write_dequeue (void) /* {{{ */
687 {
688 write_queue_t *q;
689 value_list_t *vl;
691 pthread_mutex_lock (&write_lock);
693 while (write_loop && (write_queue_head == NULL))
694 pthread_cond_wait (&write_cond, &write_lock);
696 if (write_queue_head == NULL)
697 {
698 pthread_mutex_unlock (&write_lock);
699 return (NULL);
700 }
702 q = write_queue_head;
703 write_queue_head = q->next;
704 if (write_queue_head == NULL)
705 write_queue_tail = NULL;
707 pthread_mutex_unlock (&write_lock);
709 (void) plugin_set_ctx (q->ctx);
711 vl = q->vl;
712 sfree (q);
713 return (vl);
714 } /* }}} value_list_t *plugin_write_dequeue */
716 static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
717 {
718 while (write_loop)
719 {
720 value_list_t *vl = plugin_write_dequeue ();
721 if (vl == NULL)
722 continue;
724 plugin_dispatch_values_internal (vl);
726 plugin_value_list_free (vl);
727 }
729 pthread_exit (NULL);
730 return ((void *) 0);
731 } /* }}} void *plugin_write_thread */
733 static void start_write_threads (size_t num) /* {{{ */
734 {
735 size_t i;
737 if (write_threads != NULL)
738 return;
740 write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
741 if (write_threads == NULL)
742 {
743 ERROR ("plugin: start_write_threads: calloc failed.");
744 return;
745 }
747 write_threads_num = 0;
748 for (i = 0; i < num; i++)
749 {
750 int status;
752 status = pthread_create (write_threads + write_threads_num,
753 /* attr = */ NULL,
754 plugin_write_thread,
755 /* arg = */ NULL);
756 if (status != 0)
757 {
758 char errbuf[1024];
759 ERROR ("plugin: start_write_threads: pthread_create failed "
760 "with status %i (%s).", status,
761 sstrerror (status, errbuf, sizeof (errbuf)));
762 return;
763 }
765 write_threads_num++;
766 } /* for (i) */
767 } /* }}} void start_write_threads */
769 static void stop_write_threads (void) /* {{{ */
770 {
771 write_queue_t *q;
772 int i;
774 if (write_threads == NULL)
775 return;
777 INFO ("collectd: Stopping %zu write threads.", write_threads_num);
779 pthread_mutex_lock (&write_lock);
780 write_loop = 0;
781 DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
782 pthread_cond_broadcast (&write_cond);
783 pthread_mutex_unlock (&write_lock);
785 for (i = 0; i < write_threads_num; i++)
786 {
787 if (pthread_join (write_threads[i], NULL) != 0)
788 {
789 ERROR ("plugin: stop_write_threads: pthread_join failed.");
790 }
791 write_threads[i] = (pthread_t) 0;
792 }
793 sfree (write_threads);
794 write_threads_num = 0;
796 pthread_mutex_lock (&write_lock);
797 i = 0;
798 for (q = write_queue_head; q != NULL; )
799 {
800 write_queue_t *q1 = q;
801 plugin_value_list_free (q->vl);
802 q = q->next;
803 sfree (q1);
804 i++;
805 }
806 write_queue_head = NULL;
807 write_queue_tail = NULL;
808 pthread_mutex_unlock (&write_lock);
810 if (i > 0)
811 {
812 WARNING ("plugin: %i value list%s left after shutting down "
813 "the write threads.",
814 i, (i == 1) ? " was" : "s were");
815 }
816 } /* }}} void stop_write_threads */
818 /*
819 * Public functions
820 */
821 void plugin_set_dir (const char *dir)
822 {
823 if (plugindir != NULL)
824 free (plugindir);
826 if (dir == NULL)
827 plugindir = NULL;
828 else if ((plugindir = strdup (dir)) == NULL)
829 {
830 char errbuf[1024];
831 ERROR ("strdup failed: %s",
832 sstrerror (errno, errbuf, sizeof (errbuf)));
833 }
834 }
836 static _Bool plugin_is_loaded (char const *name)
837 {
838 int status;
840 if (plugins_loaded == NULL)
841 plugins_loaded = c_avl_create ((void *) strcasecmp);
842 assert (plugins_loaded != NULL);
844 status = c_avl_get (plugins_loaded, name, /* ret_value = */ NULL);
845 return (status == 0);
846 }
848 static int plugin_mark_loaded (char const *name)
849 {
850 char *name_copy;
851 int status;
853 name_copy = strdup (name);
854 if (name_copy == NULL)
855 return (ENOMEM);
857 status = c_avl_insert (plugins_loaded,
858 /* key = */ name_copy, /* value = */ NULL);
859 return (status);
860 }
862 static void plugin_free_loaded ()
863 {
864 void *key;
865 void *value;
867 if (plugins_loaded == NULL)
868 return;
870 while (c_avl_pick (plugins_loaded, &key, &value) == 0)
871 {
872 sfree (key);
873 assert (value == NULL);
874 }
876 c_avl_destroy (plugins_loaded);
877 plugins_loaded = NULL;
878 }
880 #define BUFSIZE 512
881 int plugin_load (char const *plugin_name, uint32_t flags)
882 {
883 DIR *dh;
884 const char *dir;
885 char filename[BUFSIZE] = "";
886 char typename[BUFSIZE];
887 int typename_len;
888 int ret;
889 struct stat statbuf;
890 struct dirent *de;
891 int status;
893 if (plugin_name == NULL)
894 return (EINVAL);
896 /* Check if plugin is already loaded and don't do anything in this
897 * case. */
898 if (plugin_is_loaded (plugin_name))
899 return (0);
901 dir = plugin_get_dir ();
902 ret = 1;
904 /*
905 * XXX: Magic at work:
906 *
907 * Some of the language bindings, for example the Python and Perl
908 * plugins, need to be able to export symbols to the scripts they run.
909 * For this to happen, the "Globals" flag needs to be set.
910 * Unfortunately, this technical detail is hard to explain to the
911 * average user and she shouldn't have to worry about this, ideally.
912 * So in order to save everyone's sanity use a different default for a
913 * handful of special plugins. --octo
914 */
915 if ((strcasecmp ("perl", plugin_name) == 0)
916 || (strcasecmp ("python", plugin_name) == 0))
917 flags |= PLUGIN_FLAGS_GLOBAL;
919 /* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
920 * type when matching the filename */
921 status = ssnprintf (typename, sizeof (typename), "%s.so", plugin_name);
922 if ((status < 0) || ((size_t) status >= sizeof (typename)))
923 {
924 WARNING ("plugin_load: Filename too long: \"%s.so\"", plugin_name);
925 return (-1);
926 }
927 typename_len = strlen (typename);
929 if ((dh = opendir (dir)) == NULL)
930 {
931 char errbuf[1024];
932 ERROR ("plugin_load: opendir (%s) failed: %s", dir,
933 sstrerror (errno, errbuf, sizeof (errbuf)));
934 return (-1);
935 }
937 while ((de = readdir (dh)) != NULL)
938 {
939 if (strncasecmp (de->d_name, typename, typename_len))
940 continue;
942 status = ssnprintf (filename, sizeof (filename),
943 "%s/%s", dir, de->d_name);
944 if ((status < 0) || ((size_t) status >= sizeof (filename)))
945 {
946 WARNING ("plugin_load: Filename too long: \"%s/%s\"",
947 dir, de->d_name);
948 continue;
949 }
951 if (lstat (filename, &statbuf) == -1)
952 {
953 char errbuf[1024];
954 WARNING ("plugin_load: stat (\"%s\") failed: %s",
955 filename,
956 sstrerror (errno, errbuf, sizeof (errbuf)));
957 continue;
958 }
959 else if (!S_ISREG (statbuf.st_mode))
960 {
961 /* don't follow symlinks */
962 WARNING ("plugin_load: %s is not a regular file.",
963 filename);
964 continue;
965 }
967 status = plugin_load_file (filename, flags);
968 if (status == 0)
969 {
970 /* success */
971 plugin_mark_loaded (plugin_name);
972 ret = 0;
973 break;
974 }
975 else
976 {
977 ERROR ("plugin_load: Load plugin \"%s\" failed with "
978 "status %i.", plugin_name, status);
979 }
980 }
982 closedir (dh);
984 if (filename[0] == 0)
985 ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
986 plugin_name, dir);
988 return (ret);
989 }
991 /*
992 * The `register_*' functions follow
993 */
994 int plugin_register_config (const char *name,
995 int (*callback) (const char *key, const char *val),
996 const char **keys, int keys_num)
997 {
998 cf_register (name, callback, keys, keys_num);
999 return (0);
1000 } /* int plugin_register_config */
1002 int plugin_register_complex_config (const char *type,
1003 int (*callback) (oconfig_item_t *))
1004 {
1005 return (cf_register_complex (type, callback));
1006 } /* int plugin_register_complex_config */
1008 int plugin_register_init (const char *name,
1009 int (*callback) (void))
1010 {
1011 return (create_register_callback (&list_init, name, (void *) callback,
1012 /* user_data = */ NULL));
1013 } /* plugin_register_init */
1015 static int plugin_compare_read_func (const void *arg0, const void *arg1)
1016 {
1017 const read_func_t *rf0;
1018 const read_func_t *rf1;
1020 rf0 = arg0;
1021 rf1 = arg1;
1023 if (rf0->rf_next_read < rf1->rf_next_read)
1024 return (-1);
1025 else if (rf0->rf_next_read > rf1->rf_next_read)
1026 return (1);
1027 else
1028 return (0);
1029 } /* int plugin_compare_read_func */
1031 /* Add a read function to both, the heap and a linked list. The linked list if
1032 * used to look-up read functions, especially for the remove function. The heap
1033 * is used to determine which plugin to read next. */
1034 static int plugin_insert_read (read_func_t *rf)
1035 {
1036 int status;
1037 llentry_t *le;
1039 rf->rf_next_read = cdtime ();
1040 rf->rf_effective_interval = rf->rf_interval;
1042 pthread_mutex_lock (&read_lock);
1044 if (read_list == NULL)
1045 {
1046 read_list = llist_create ();
1047 if (read_list == NULL)
1048 {
1049 pthread_mutex_unlock (&read_lock);
1050 ERROR ("plugin_insert_read: read_list failed.");
1051 return (-1);
1052 }
1053 }
1055 if (read_heap == NULL)
1056 {
1057 read_heap = c_heap_create (plugin_compare_read_func);
1058 if (read_heap == NULL)
1059 {
1060 pthread_mutex_unlock (&read_lock);
1061 ERROR ("plugin_insert_read: c_heap_create failed.");
1062 return (-1);
1063 }
1064 }
1066 le = llist_search (read_list, rf->rf_name);
1067 if (le != NULL)
1068 {
1069 pthread_mutex_unlock (&read_lock);
1070 WARNING ("The read function \"%s\" is already registered. "
1071 "Check for duplicate \"LoadPlugin\" lines "
1072 "in your configuration!",
1073 rf->rf_name);
1074 return (EINVAL);
1075 }
1077 le = llentry_create (rf->rf_name, rf);
1078 if (le == NULL)
1079 {
1080 pthread_mutex_unlock (&read_lock);
1081 ERROR ("plugin_insert_read: llentry_create failed.");
1082 return (-1);
1083 }
1085 status = c_heap_insert (read_heap, rf);
1086 if (status != 0)
1087 {
1088 pthread_mutex_unlock (&read_lock);
1089 ERROR ("plugin_insert_read: c_heap_insert failed.");
1090 llentry_destroy (le);
1091 return (-1);
1092 }
1094 /* This does not fail. */
1095 llist_append (read_list, le);
1097 /* Wake up all the read threads. */
1098 pthread_cond_broadcast (&read_cond);
1099 pthread_mutex_unlock (&read_lock);
1100 return (0);
1101 } /* int plugin_insert_read */
1103 int plugin_register_read (const char *name,
1104 int (*callback) (void))
1105 {
1106 read_func_t *rf;
1107 int status;
1109 rf = malloc (sizeof (*rf));
1110 if (rf == NULL)
1111 {
1112 ERROR ("plugin_register_read: malloc failed.");
1113 return (ENOMEM);
1114 }
1116 memset (rf, 0, sizeof (read_func_t));
1117 rf->rf_callback = (void *) callback;
1118 rf->rf_udata.data = NULL;
1119 rf->rf_udata.free_func = NULL;
1120 rf->rf_ctx = plugin_get_ctx ();
1121 rf->rf_group[0] = '\0';
1122 rf->rf_name = strdup (name);
1123 rf->rf_type = RF_SIMPLE;
1124 rf->rf_interval = plugin_get_interval ();
1126 status = plugin_insert_read (rf);
1127 if (status != 0)
1128 sfree (rf);
1130 return (status);
1131 } /* int plugin_register_read */
1133 int plugin_register_complex_read (const char *group, const char *name,
1134 plugin_read_cb callback,
1135 const struct timespec *interval,
1136 user_data_t *user_data)
1137 {
1138 read_func_t *rf;
1139 int status;
1141 rf = malloc (sizeof (*rf));
1142 if (rf == NULL)
1143 {
1144 ERROR ("plugin_register_complex_read: malloc failed.");
1145 return (ENOMEM);
1146 }
1148 memset (rf, 0, sizeof (read_func_t));
1149 rf->rf_callback = (void *) callback;
1150 if (group != NULL)
1151 sstrncpy (rf->rf_group, group, sizeof (rf->rf_group));
1152 else
1153 rf->rf_group[0] = '\0';
1154 rf->rf_name = strdup (name);
1155 rf->rf_type = RF_COMPLEX;
1156 if (interval != NULL)
1157 rf->rf_interval = TIMESPEC_TO_CDTIME_T (interval);
1158 else
1159 rf->rf_interval = plugin_get_interval ();
1161 /* Set user data */
1162 if (user_data == NULL)
1163 {
1164 rf->rf_udata.data = NULL;
1165 rf->rf_udata.free_func = NULL;
1166 }
1167 else
1168 {
1169 rf->rf_udata = *user_data;
1170 }
1172 rf->rf_ctx = plugin_get_ctx ();
1174 status = plugin_insert_read (rf);
1175 if (status != 0)
1176 sfree (rf);
1178 return (status);
1179 } /* int plugin_register_complex_read */
1181 int plugin_register_write (const char *name,
1182 plugin_write_cb callback, user_data_t *ud)
1183 {
1184 return (create_register_callback (&list_write, name,
1185 (void *) callback, ud));
1186 } /* int plugin_register_write */
1188 int plugin_register_flush (const char *name,
1189 plugin_flush_cb callback, user_data_t *ud)
1190 {
1191 return (create_register_callback (&list_flush, name,
1192 (void *) callback, ud));
1193 } /* int plugin_register_flush */
1195 int plugin_register_missing (const char *name,
1196 plugin_missing_cb callback, user_data_t *ud)
1197 {
1198 return (create_register_callback (&list_missing, name,
1199 (void *) callback, ud));
1200 } /* int plugin_register_missing */
1202 int plugin_register_shutdown (const char *name,
1203 int (*callback) (void))
1204 {
1205 return (create_register_callback (&list_shutdown, name,
1206 (void *) callback, /* user_data = */ NULL));
1207 } /* int plugin_register_shutdown */
1209 static void plugin_free_data_sets (void)
1210 {
1211 void *key;
1212 void *value;
1214 if (data_sets == NULL)
1215 return;
1217 while (c_avl_pick (data_sets, &key, &value) == 0)
1218 {
1219 data_set_t *ds = value;
1220 /* key is a pointer to ds->type */
1222 sfree (ds->ds);
1223 sfree (ds);
1224 }
1226 c_avl_destroy (data_sets);
1227 data_sets = NULL;
1228 } /* void plugin_free_data_sets */
1230 int plugin_register_data_set (const data_set_t *ds)
1231 {
1232 data_set_t *ds_copy;
1233 int i;
1235 if ((data_sets != NULL)
1236 && (c_avl_get (data_sets, ds->type, NULL) == 0))
1237 {
1238 NOTICE ("Replacing DS `%s' with another version.", ds->type);
1239 plugin_unregister_data_set (ds->type);
1240 }
1241 else if (data_sets == NULL)
1242 {
1243 data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1244 if (data_sets == NULL)
1245 return (-1);
1246 }
1248 ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
1249 if (ds_copy == NULL)
1250 return (-1);
1251 memcpy(ds_copy, ds, sizeof (data_set_t));
1253 ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
1254 * ds->ds_num);
1255 if (ds_copy->ds == NULL)
1256 {
1257 free (ds_copy);
1258 return (-1);
1259 }
1261 for (i = 0; i < ds->ds_num; i++)
1262 memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
1264 return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
1265 } /* int plugin_register_data_set */
1267 int plugin_register_log (const char *name,
1268 plugin_log_cb callback, user_data_t *ud)
1269 {
1270 return (create_register_callback (&list_log, name,
1271 (void *) callback, ud));
1272 } /* int plugin_register_log */
1274 int plugin_register_notification (const char *name,
1275 plugin_notification_cb callback, user_data_t *ud)
1276 {
1277 return (create_register_callback (&list_notification, name,
1278 (void *) callback, ud));
1279 } /* int plugin_register_log */
1281 int plugin_unregister_config (const char *name)
1282 {
1283 cf_unregister (name);
1284 return (0);
1285 } /* int plugin_unregister_config */
1287 int plugin_unregister_complex_config (const char *name)
1288 {
1289 cf_unregister_complex (name);
1290 return (0);
1291 } /* int plugin_unregister_complex_config */
1293 int plugin_unregister_init (const char *name)
1294 {
1295 return (plugin_unregister (list_init, name));
1296 }
1298 int plugin_unregister_read (const char *name) /* {{{ */
1299 {
1300 llentry_t *le;
1301 read_func_t *rf;
1303 if (name == NULL)
1304 return (-ENOENT);
1306 pthread_mutex_lock (&read_lock);
1308 if (read_list == NULL)
1309 {
1310 pthread_mutex_unlock (&read_lock);
1311 return (-ENOENT);
1312 }
1314 le = llist_search (read_list, name);
1315 if (le == NULL)
1316 {
1317 pthread_mutex_unlock (&read_lock);
1318 WARNING ("plugin_unregister_read: No such read function: %s",
1319 name);
1320 return (-ENOENT);
1321 }
1323 llist_remove (read_list, le);
1325 rf = le->value;
1326 assert (rf != NULL);
1327 rf->rf_type = RF_REMOVE;
1329 pthread_mutex_unlock (&read_lock);
1331 llentry_destroy (le);
1333 DEBUG ("plugin_unregister_read: Marked `%s' for removal.", name);
1335 return (0);
1336 } /* }}} int plugin_unregister_read */
1338 static int compare_read_func_group (llentry_t *e, void *ud) /* {{{ */
1339 {
1340 read_func_t *rf = e->value;
1341 char *group = ud;
1343 return strcmp (rf->rf_group, (const char *)group);
1344 } /* }}} int compare_read_func_group */
1346 int plugin_unregister_read_group (const char *group) /* {{{ */
1347 {
1348 llentry_t *le;
1349 read_func_t *rf;
1351 int found = 0;
1353 if (group == NULL)
1354 return (-ENOENT);
1356 pthread_mutex_lock (&read_lock);
1358 if (read_list == NULL)
1359 {
1360 pthread_mutex_unlock (&read_lock);
1361 return (-ENOENT);
1362 }
1364 while (42)
1365 {
1366 le = llist_search_custom (read_list,
1367 compare_read_func_group, (void *)group);
1369 if (le == NULL)
1370 break;
1372 ++found;
1374 llist_remove (read_list, le);
1376 rf = le->value;
1377 assert (rf != NULL);
1378 rf->rf_type = RF_REMOVE;
1380 llentry_destroy (le);
1382 DEBUG ("plugin_unregister_read_group: "
1383 "Marked `%s' (group `%s') for removal.",
1384 rf->rf_name, group);
1385 }
1387 pthread_mutex_unlock (&read_lock);
1389 if (found == 0)
1390 {
1391 WARNING ("plugin_unregister_read_group: No such "
1392 "group of read function: %s", group);
1393 return (-ENOENT);
1394 }
1396 return (0);
1397 } /* }}} int plugin_unregister_read_group */
1399 int plugin_unregister_write (const char *name)
1400 {
1401 return (plugin_unregister (list_write, name));
1402 }
1404 int plugin_unregister_flush (const char *name)
1405 {
1406 return (plugin_unregister (list_flush, name));
1407 }
1409 int plugin_unregister_missing (const char *name)
1410 {
1411 return (plugin_unregister (list_missing, name));
1412 }
1414 int plugin_unregister_shutdown (const char *name)
1415 {
1416 return (plugin_unregister (list_shutdown, name));
1417 }
1419 int plugin_unregister_data_set (const char *name)
1420 {
1421 data_set_t *ds;
1423 if (data_sets == NULL)
1424 return (-1);
1426 if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
1427 return (-1);
1429 sfree (ds->ds);
1430 sfree (ds);
1432 return (0);
1433 } /* int plugin_unregister_data_set */
1435 int plugin_unregister_log (const char *name)
1436 {
1437 return (plugin_unregister (list_log, name));
1438 }
1440 int plugin_unregister_notification (const char *name)
1441 {
1442 return (plugin_unregister (list_notification, name));
1443 }
1445 void plugin_init_all (void)
1446 {
1447 const char *chain_name;
1448 llentry_t *le;
1449 int status;
1451 /* Init the value cache */
1452 uc_init ();
1454 chain_name = global_option_get ("PreCacheChain");
1455 pre_cache_chain = fc_chain_get_by_name (chain_name);
1457 chain_name = global_option_get ("PostCacheChain");
1458 post_cache_chain = fc_chain_get_by_name (chain_name);
1460 {
1461 char const *tmp = global_option_get ("WriteThreads");
1462 int num = atoi (tmp);
1464 if (num < 1)
1465 num = 5;
1467 start_write_threads ((size_t) num);
1468 }
1470 if ((list_init == NULL) && (read_heap == NULL))
1471 return;
1473 /* Calling all init callbacks before checking if read callbacks
1474 * are available allows the init callbacks to register the read
1475 * callback. */
1476 le = llist_head (list_init);
1477 while (le != NULL)
1478 {
1479 callback_func_t *cf;
1480 plugin_init_cb callback;
1481 plugin_ctx_t old_ctx;
1483 cf = le->value;
1484 old_ctx = plugin_set_ctx (cf->cf_ctx);
1485 callback = cf->cf_callback;
1486 status = (*callback) ();
1487 plugin_set_ctx (old_ctx);
1489 if (status != 0)
1490 {
1491 ERROR ("Initialization of plugin `%s' "
1492 "failed with status %i. "
1493 "Plugin will be unloaded.",
1494 le->key, status);
1495 /* Plugins that register read callbacks from the init
1496 * callback should take care of appropriate error
1497 * handling themselves. */
1498 /* FIXME: Unload _all_ functions */
1499 plugin_unregister_read (le->key);
1500 }
1502 le = le->next;
1503 }
1505 /* Start read-threads */
1506 if (read_heap != NULL)
1507 {
1508 const char *rt;
1509 int num;
1510 rt = global_option_get ("ReadThreads");
1511 num = atoi (rt);
1512 if (num != -1)
1513 start_read_threads ((num > 0) ? num : 5);
1514 }
1515 } /* void plugin_init_all */
1517 /* TODO: Rename this function. */
1518 void plugin_read_all (void)
1519 {
1520 uc_check_timeout ();
1522 return;
1523 } /* void plugin_read_all */
1525 /* Read function called when the `-T' command line argument is given. */
1526 int plugin_read_all_once (void)
1527 {
1528 int status;
1529 int return_status = 0;
1531 if (read_heap == NULL)
1532 {
1533 NOTICE ("No read-functions are registered.");
1534 return (0);
1535 }
1537 while (42)
1538 {
1539 read_func_t *rf;
1540 plugin_ctx_t old_ctx;
1542 rf = c_heap_get_root (read_heap);
1543 if (rf == NULL)
1544 break;
1546 old_ctx = plugin_set_ctx (rf->rf_ctx);
1548 if (rf->rf_type == RF_SIMPLE)
1549 {
1550 int (*callback) (void);
1552 callback = rf->rf_callback;
1553 status = (*callback) ();
1554 }
1555 else
1556 {
1557 plugin_read_cb callback;
1559 callback = rf->rf_callback;
1560 status = (*callback) (&rf->rf_udata);
1561 }
1563 plugin_set_ctx (old_ctx);
1565 if (status != 0)
1566 {
1567 NOTICE ("read-function of plugin `%s' failed.",
1568 rf->rf_name);
1569 return_status = -1;
1570 }
1572 destroy_callback ((void *) rf);
1573 }
1575 return (return_status);
1576 } /* int plugin_read_all_once */
1578 int plugin_write (const char *plugin, /* {{{ */
1579 const data_set_t *ds, const value_list_t *vl)
1580 {
1581 llentry_t *le;
1582 int status;
1584 if (vl == NULL)
1585 return (EINVAL);
1587 if (list_write == NULL)
1588 return (ENOENT);
1590 if (ds == NULL)
1591 {
1592 ds = plugin_get_ds (vl->type);
1593 if (ds == NULL)
1594 {
1595 ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
1596 return (ENOENT);
1597 }
1598 }
1600 if (plugin == NULL)
1601 {
1602 int success = 0;
1603 int failure = 0;
1605 le = llist_head (list_write);
1606 while (le != NULL)
1607 {
1608 callback_func_t *cf = le->value;
1609 plugin_write_cb callback;
1611 /* do not switch plugin context; rather keep the context (interval)
1612 * information of the calling read plugin */
1614 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1615 callback = cf->cf_callback;
1616 status = (*callback) (ds, vl, &cf->cf_udata);
1617 if (status != 0)
1618 failure++;
1619 else
1620 success++;
1622 le = le->next;
1623 }
1625 if ((success == 0) && (failure != 0))
1626 status = -1;
1627 else
1628 status = 0;
1629 }
1630 else /* plugin != NULL */
1631 {
1632 callback_func_t *cf;
1633 plugin_write_cb callback;
1635 le = llist_head (list_write);
1636 while (le != NULL)
1637 {
1638 if (strcasecmp (plugin, le->key) == 0)
1639 break;
1641 le = le->next;
1642 }
1644 if (le == NULL)
1645 return (ENOENT);
1647 cf = le->value;
1649 /* do not switch plugin context; rather keep the context (interval)
1650 * information of the calling read plugin */
1652 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1653 callback = cf->cf_callback;
1654 status = (*callback) (ds, vl, &cf->cf_udata);
1655 }
1657 return (status);
1658 } /* }}} int plugin_write */
1660 int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier)
1661 {
1662 llentry_t *le;
1664 if (list_flush == NULL)
1665 return (0);
1667 le = llist_head (list_flush);
1668 while (le != NULL)
1669 {
1670 callback_func_t *cf;
1671 plugin_flush_cb callback;
1672 plugin_ctx_t old_ctx;
1674 if ((plugin != NULL)
1675 && (strcmp (plugin, le->key) != 0))
1676 {
1677 le = le->next;
1678 continue;
1679 }
1681 cf = le->value;
1682 old_ctx = plugin_set_ctx (cf->cf_ctx);
1683 callback = cf->cf_callback;
1685 (*callback) (timeout, identifier, &cf->cf_udata);
1687 plugin_set_ctx (old_ctx);
1689 le = le->next;
1690 }
1691 return (0);
1692 } /* int plugin_flush */
1694 void plugin_shutdown_all (void)
1695 {
1696 llentry_t *le;
1698 stop_read_threads ();
1700 destroy_all_callbacks (&list_init);
1702 pthread_mutex_lock (&read_lock);
1703 llist_destroy (read_list);
1704 read_list = NULL;
1705 pthread_mutex_unlock (&read_lock);
1707 destroy_read_heap ();
1709 plugin_flush (/* plugin = */ NULL,
1710 /* timeout = */ 0,
1711 /* identifier = */ NULL);
1713 le = NULL;
1714 if (list_shutdown != NULL)
1715 le = llist_head (list_shutdown);
1717 while (le != NULL)
1718 {
1719 callback_func_t *cf;
1720 plugin_shutdown_cb callback;
1721 plugin_ctx_t old_ctx;
1723 cf = le->value;
1724 old_ctx = plugin_set_ctx (cf->cf_ctx);
1725 callback = cf->cf_callback;
1727 /* Advance the pointer before calling the callback allows
1728 * shutdown functions to unregister themselves. If done the
1729 * other way around the memory `le' points to will be freed
1730 * after callback returns. */
1731 le = le->next;
1733 (*callback) ();
1735 plugin_set_ctx (old_ctx);
1736 }
1738 stop_write_threads ();
1740 /* Write plugins which use the `user_data' pointer usually need the
1741 * same data available to the flush callback. If this is the case, set
1742 * the free_function to NULL when registering the flush callback and to
1743 * the real free function when registering the write callback. This way
1744 * the data isn't freed twice. */
1745 destroy_all_callbacks (&list_flush);
1746 destroy_all_callbacks (&list_missing);
1747 destroy_all_callbacks (&list_write);
1749 destroy_all_callbacks (&list_notification);
1750 destroy_all_callbacks (&list_shutdown);
1751 destroy_all_callbacks (&list_log);
1753 plugin_free_loaded ();
1754 plugin_free_data_sets ();
1755 } /* void plugin_shutdown_all */
1757 int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
1758 {
1759 llentry_t *le;
1761 if (list_missing == NULL)
1762 return (0);
1764 le = llist_head (list_missing);
1765 while (le != NULL)
1766 {
1767 callback_func_t *cf;
1768 plugin_missing_cb callback;
1769 plugin_ctx_t old_ctx;
1770 int status;
1772 cf = le->value;
1773 old_ctx = plugin_set_ctx (cf->cf_ctx);
1774 callback = cf->cf_callback;
1776 status = (*callback) (vl, &cf->cf_udata);
1777 plugin_set_ctx (old_ctx);
1778 if (status != 0)
1779 {
1780 if (status < 0)
1781 {
1782 ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
1783 "failed with status %i.",
1784 le->key, status);
1785 return (status);
1786 }
1787 else
1788 {
1789 return (0);
1790 }
1791 }
1793 le = le->next;
1794 }
1795 return (0);
1796 } /* int }}} plugin_dispatch_missing */
1798 static int plugin_dispatch_values_internal (value_list_t *vl)
1799 {
1800 int status;
1801 static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
1803 value_t *saved_values;
1804 int saved_values_len;
1806 data_set_t *ds;
1808 int free_meta_data = 0;
1810 if ((vl == NULL) || (vl->type[0] == 0)
1811 || (vl->values == NULL) || (vl->values_len < 1))
1812 {
1813 ERROR ("plugin_dispatch_values: Invalid value list "
1814 "from plugin %s.", vl->plugin);
1815 return (-1);
1816 }
1818 /* Free meta data only if the calling function didn't specify any. In
1819 * this case matches and targets may add some and the calling function
1820 * may not expect (and therefore free) that data. */
1821 if (vl->meta == NULL)
1822 free_meta_data = 1;
1824 if (list_write == NULL)
1825 c_complain_once (LOG_WARNING, &no_write_complaint,
1826 "plugin_dispatch_values: No write callback has been "
1827 "registered. Please load at least one output plugin, "
1828 "if you want the collected data to be stored.");
1830 if (data_sets == NULL)
1831 {
1832 ERROR ("plugin_dispatch_values: No data sets registered. "
1833 "Could the types database be read? Check "
1834 "your `TypesDB' setting!");
1835 return (-1);
1836 }
1838 if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
1839 {
1840 char ident[6 * DATA_MAX_NAME_LEN];
1842 FORMAT_VL (ident, sizeof (ident), vl);
1843 INFO ("plugin_dispatch_values: Dataset not found: %s "
1844 "(from \"%s\"), check your types.db!",
1845 vl->type, ident);
1846 return (-1);
1847 }
1849 /* Assured by plugin_value_list_clone(). The time is determined at
1850 * _enqueue_ time. */
1851 assert (vl->time != 0);
1852 assert (vl->interval != 0);
1854 DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
1855 "host = %s; "
1856 "plugin = %s; plugin_instance = %s; "
1857 "type = %s; type_instance = %s;",
1858 CDTIME_T_TO_DOUBLE (vl->time),
1859 CDTIME_T_TO_DOUBLE (vl->interval),
1860 vl->host,
1861 vl->plugin, vl->plugin_instance,
1862 vl->type, vl->type_instance);
1864 #if COLLECT_DEBUG
1865 assert (0 == strcmp (ds->type, vl->type));
1866 #else
1867 if (0 != strcmp (ds->type, vl->type))
1868 WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
1869 ds->type, vl->type);
1870 #endif
1872 #if COLLECT_DEBUG
1873 assert (ds->ds_num == vl->values_len);
1874 #else
1875 if (ds->ds_num != vl->values_len)
1876 {
1877 ERROR ("plugin_dispatch_values: ds->type = %s: "
1878 "(ds->ds_num = %i) != "
1879 "(vl->values_len = %i)",
1880 ds->type, ds->ds_num, vl->values_len);
1881 return (-1);
1882 }
1883 #endif
1885 escape_slashes (vl->host, sizeof (vl->host));
1886 escape_slashes (vl->plugin, sizeof (vl->plugin));
1887 escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
1888 escape_slashes (vl->type, sizeof (vl->type));
1889 escape_slashes (vl->type_instance, sizeof (vl->type_instance));
1891 /* Copy the values. This way, we can assure `targets' that they get
1892 * dynamically allocated values, which they can free and replace if
1893 * they like. */
1894 if ((pre_cache_chain != NULL) || (post_cache_chain != NULL))
1895 {
1896 saved_values = vl->values;
1897 saved_values_len = vl->values_len;
1899 vl->values = (value_t *) calloc (vl->values_len,
1900 sizeof (*vl->values));
1901 if (vl->values == NULL)
1902 {
1903 ERROR ("plugin_dispatch_values: calloc failed.");
1904 vl->values = saved_values;
1905 return (-1);
1906 }
1907 memcpy (vl->values, saved_values,
1908 vl->values_len * sizeof (*vl->values));
1909 }
1910 else /* if ((pre == NULL) && (post == NULL)) */
1911 {
1912 saved_values = NULL;
1913 saved_values_len = 0;
1914 }
1916 if (pre_cache_chain != NULL)
1917 {
1918 status = fc_process_chain (ds, vl, pre_cache_chain);
1919 if (status < 0)
1920 {
1921 WARNING ("plugin_dispatch_values: Running the "
1922 "pre-cache chain failed with "
1923 "status %i (%#x).",
1924 status, status);
1925 }
1926 else if (status == FC_TARGET_STOP)
1927 {
1928 /* Restore the state of the value_list so that plugins
1929 * don't get confused.. */
1930 if (saved_values != NULL)
1931 {
1932 free (vl->values);
1933 vl->values = saved_values;
1934 vl->values_len = saved_values_len;
1935 }
1936 return (0);
1937 }
1938 }
1940 /* Update the value cache */
1941 uc_update (ds, vl);
1943 if (post_cache_chain != NULL)
1944 {
1945 status = fc_process_chain (ds, vl, post_cache_chain);
1946 if (status < 0)
1947 {
1948 WARNING ("plugin_dispatch_values: Running the "
1949 "post-cache chain failed with "
1950 "status %i (%#x).",
1951 status, status);
1952 }
1953 }
1954 else
1955 fc_default_action (ds, vl);
1957 /* Restore the state of the value_list so that plugins don't get
1958 * confused.. */
1959 if (saved_values != NULL)
1960 {
1961 free (vl->values);
1962 vl->values = saved_values;
1963 vl->values_len = saved_values_len;
1964 }
1966 if ((free_meta_data != 0) && (vl->meta != NULL))
1967 {
1968 meta_data_destroy (vl->meta);
1969 vl->meta = NULL;
1970 }
1972 return (0);
1973 } /* int plugin_dispatch_values_internal */
1975 int plugin_dispatch_values (value_list_t const *vl)
1976 {
1977 int status;
1979 status = plugin_write_enqueue (vl);
1980 if (status != 0)
1981 {
1982 char errbuf[1024];
1983 ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
1984 "with status %i (%s).", status,
1985 sstrerror (status, errbuf, sizeof (errbuf)));
1986 return (status);
1987 }
1989 return (0);
1990 }
1992 int plugin_dispatch_notification (const notification_t *notif)
1993 {
1994 llentry_t *le;
1995 /* Possible TODO: Add flap detection here */
1997 DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
1998 "time = %.3f; host = %s;",
1999 notif->severity, notif->message,
2000 CDTIME_T_TO_DOUBLE (notif->time), notif->host);
2002 /* Nobody cares for notifications */
2003 if (list_notification == NULL)
2004 return (-1);
2006 le = llist_head (list_notification);
2007 while (le != NULL)
2008 {
2009 callback_func_t *cf;
2010 plugin_notification_cb callback;
2011 int status;
2013 /* do not switch plugin context; rather keep the context
2014 * (interval) information of the calling plugin */
2016 cf = le->value;
2017 callback = cf->cf_callback;
2018 status = (*callback) (notif, &cf->cf_udata);
2019 if (status != 0)
2020 {
2021 WARNING ("plugin_dispatch_notification: Notification "
2022 "callback %s returned %i.",
2023 le->key, status);
2024 }
2026 le = le->next;
2027 }
2029 return (0);
2030 } /* int plugin_dispatch_notification */
2032 void plugin_log (int level, const char *format, ...)
2033 {
2034 char msg[1024];
2035 va_list ap;
2036 llentry_t *le;
2038 #if !COLLECT_DEBUG
2039 if (level >= LOG_DEBUG)
2040 return;
2041 #endif
2043 va_start (ap, format);
2044 vsnprintf (msg, sizeof (msg), format, ap);
2045 msg[sizeof (msg) - 1] = '\0';
2046 va_end (ap);
2048 if (list_log == NULL)
2049 {
2050 fprintf (stderr, "%s\n", msg);
2051 return;
2052 }
2054 le = llist_head (list_log);
2055 while (le != NULL)
2056 {
2057 callback_func_t *cf;
2058 plugin_log_cb callback;
2060 cf = le->value;
2061 callback = cf->cf_callback;
2063 /* do not switch plugin context; rather keep the context
2064 * (interval) information of the calling plugin */
2066 (*callback) (level, msg, &cf->cf_udata);
2068 le = le->next;
2069 }
2070 } /* void plugin_log */
2072 int parse_log_severity (const char *severity)
2073 {
2074 int log_level = -1;
2076 if ((0 == strcasecmp (severity, "emerg"))
2077 || (0 == strcasecmp (severity, "alert"))
2078 || (0 == strcasecmp (severity, "crit"))
2079 || (0 == strcasecmp (severity, "err")))
2080 log_level = LOG_ERR;
2081 else if (0 == strcasecmp (severity, "warning"))
2082 log_level = LOG_WARNING;
2083 else if (0 == strcasecmp (severity, "notice"))
2084 log_level = LOG_NOTICE;
2085 else if (0 == strcasecmp (severity, "info"))
2086 log_level = LOG_INFO;
2087 #if COLLECT_DEBUG
2088 else if (0 == strcasecmp (severity, "debug"))
2089 log_level = LOG_DEBUG;
2090 #endif /* COLLECT_DEBUG */
2092 return (log_level);
2093 } /* int parse_log_severity */
2095 int parse_notif_severity (const char *severity)
2096 {
2097 int notif_severity = -1;
2099 if (strcasecmp (severity, "FAILURE") == 0)
2100 notif_severity = NOTIF_FAILURE;
2101 else if (strcmp (severity, "OKAY") == 0)
2102 notif_severity = NOTIF_OKAY;
2103 else if ((strcmp (severity, "WARNING") == 0)
2104 || (strcmp (severity, "WARN") == 0))
2105 notif_severity = NOTIF_WARNING;
2107 return (notif_severity);
2108 } /* int parse_notif_severity */
2110 const data_set_t *plugin_get_ds (const char *name)
2111 {
2112 data_set_t *ds;
2114 if (data_sets == NULL)
2115 {
2116 ERROR ("plugin_get_ds: No data sets are defined yet.");
2117 return (NULL);
2118 }
2120 if (c_avl_get (data_sets, name, (void *) &ds) != 0)
2121 {
2122 DEBUG ("No such dataset registered: %s", name);
2123 return (NULL);
2124 }
2126 return (ds);
2127 } /* data_set_t *plugin_get_ds */
2129 static int plugin_notification_meta_add (notification_t *n,
2130 const char *name,
2131 enum notification_meta_type_e type,
2132 const void *value)
2133 {
2134 notification_meta_t *meta;
2135 notification_meta_t *tail;
2137 if ((n == NULL) || (name == NULL) || (value == NULL))
2138 {
2139 ERROR ("plugin_notification_meta_add: A pointer is NULL!");
2140 return (-1);
2141 }
2143 meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
2144 if (meta == NULL)
2145 {
2146 ERROR ("plugin_notification_meta_add: malloc failed.");
2147 return (-1);
2148 }
2149 memset (meta, 0, sizeof (notification_meta_t));
2151 sstrncpy (meta->name, name, sizeof (meta->name));
2152 meta->type = type;
2154 switch (type)
2155 {
2156 case NM_TYPE_STRING:
2157 {
2158 meta->nm_value.nm_string = strdup ((const char *) value);
2159 if (meta->nm_value.nm_string == NULL)
2160 {
2161 ERROR ("plugin_notification_meta_add: strdup failed.");
2162 sfree (meta);
2163 return (-1);
2164 }
2165 break;
2166 }
2167 case NM_TYPE_SIGNED_INT:
2168 {
2169 meta->nm_value.nm_signed_int = *((int64_t *) value);
2170 break;
2171 }
2172 case NM_TYPE_UNSIGNED_INT:
2173 {
2174 meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
2175 break;
2176 }
2177 case NM_TYPE_DOUBLE:
2178 {
2179 meta->nm_value.nm_double = *((double *) value);
2180 break;
2181 }
2182 case NM_TYPE_BOOLEAN:
2183 {
2184 meta->nm_value.nm_boolean = *((_Bool *) value);
2185 break;
2186 }
2187 default:
2188 {
2189 ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
2190 sfree (meta);
2191 return (-1);
2192 }
2193 } /* switch (type) */
2195 meta->next = NULL;
2196 tail = n->meta;
2197 while ((tail != NULL) && (tail->next != NULL))
2198 tail = tail->next;
2200 if (tail == NULL)
2201 n->meta = meta;
2202 else
2203 tail->next = meta;
2205 return (0);
2206 } /* int plugin_notification_meta_add */
2208 int plugin_notification_meta_add_string (notification_t *n,
2209 const char *name,
2210 const char *value)
2211 {
2212 return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
2213 }
2215 int plugin_notification_meta_add_signed_int (notification_t *n,
2216 const char *name,
2217 int64_t value)
2218 {
2219 return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
2220 }
2222 int plugin_notification_meta_add_unsigned_int (notification_t *n,
2223 const char *name,
2224 uint64_t value)
2225 {
2226 return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
2227 }
2229 int plugin_notification_meta_add_double (notification_t *n,
2230 const char *name,
2231 double value)
2232 {
2233 return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
2234 }
2236 int plugin_notification_meta_add_boolean (notification_t *n,
2237 const char *name,
2238 _Bool value)
2239 {
2240 return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
2241 }
2243 int plugin_notification_meta_copy (notification_t *dst,
2244 const notification_t *src)
2245 {
2246 notification_meta_t *meta;
2248 assert (dst != NULL);
2249 assert (src != NULL);
2250 assert (dst != src);
2251 assert ((src->meta == NULL) || (src->meta != dst->meta));
2253 for (meta = src->meta; meta != NULL; meta = meta->next)
2254 {
2255 if (meta->type == NM_TYPE_STRING)
2256 plugin_notification_meta_add_string (dst, meta->name,
2257 meta->nm_value.nm_string);
2258 else if (meta->type == NM_TYPE_SIGNED_INT)
2259 plugin_notification_meta_add_signed_int (dst, meta->name,
2260 meta->nm_value.nm_signed_int);
2261 else if (meta->type == NM_TYPE_UNSIGNED_INT)
2262 plugin_notification_meta_add_unsigned_int (dst, meta->name,
2263 meta->nm_value.nm_unsigned_int);
2264 else if (meta->type == NM_TYPE_DOUBLE)
2265 plugin_notification_meta_add_double (dst, meta->name,
2266 meta->nm_value.nm_double);
2267 else if (meta->type == NM_TYPE_BOOLEAN)
2268 plugin_notification_meta_add_boolean (dst, meta->name,
2269 meta->nm_value.nm_boolean);
2270 }
2272 return (0);
2273 } /* int plugin_notification_meta_copy */
2275 int plugin_notification_meta_free (notification_meta_t *n)
2276 {
2277 notification_meta_t *this;
2278 notification_meta_t *next;
2280 if (n == NULL)
2281 {
2282 ERROR ("plugin_notification_meta_free: n == NULL!");
2283 return (-1);
2284 }
2286 this = n;
2287 while (this != NULL)
2288 {
2289 next = this->next;
2291 if (this->type == NM_TYPE_STRING)
2292 {
2293 free ((char *)this->nm_value.nm_string);
2294 this->nm_value.nm_string = NULL;
2295 }
2296 sfree (this);
2298 this = next;
2299 }
2301 return (0);
2302 } /* int plugin_notification_meta_free */
2304 static void plugin_ctx_destructor (void *ctx)
2305 {
2306 sfree (ctx);
2307 } /* void plugin_ctx_destructor */
2309 static plugin_ctx_t ctx_init = { /* interval = */ 0 };
2311 static plugin_ctx_t *plugin_ctx_create (void)
2312 {
2313 plugin_ctx_t *ctx;
2315 ctx = malloc (sizeof (*ctx));
2316 if (ctx == NULL) {
2317 char errbuf[1024];
2318 ERROR ("Failed to allocate plugin context: %s",
2319 sstrerror (errno, errbuf, sizeof (errbuf)));
2320 return NULL;
2321 }
2323 *ctx = ctx_init;
2324 assert (plugin_ctx_key_initialized);
2325 pthread_setspecific (plugin_ctx_key, ctx);
2326 DEBUG("Created new plugin context.");
2327 return (ctx);
2328 } /* int plugin_ctx_create */
2330 void plugin_init_ctx (void)
2331 {
2332 pthread_key_create (&plugin_ctx_key, plugin_ctx_destructor);
2333 plugin_ctx_key_initialized = 1;
2334 } /* void plugin_init_ctx */
2336 plugin_ctx_t plugin_get_ctx (void)
2337 {
2338 plugin_ctx_t *ctx;
2340 assert (plugin_ctx_key_initialized);
2341 ctx = pthread_getspecific (plugin_ctx_key);
2343 if (ctx == NULL) {
2344 ctx = plugin_ctx_create ();
2345 /* this must no happen -- exit() instead? */
2346 if (ctx == NULL)
2347 return ctx_init;
2348 }
2350 return (*ctx);
2351 } /* plugin_ctx_t plugin_get_ctx */
2353 plugin_ctx_t plugin_set_ctx (plugin_ctx_t ctx)
2354 {
2355 plugin_ctx_t *c;
2356 plugin_ctx_t old;
2358 assert (plugin_ctx_key_initialized);
2359 c = pthread_getspecific (plugin_ctx_key);
2361 if (c == NULL) {
2362 c = plugin_ctx_create ();
2363 /* this must no happen -- exit() instead? */
2364 if (c == NULL)
2365 return ctx_init;
2366 }
2368 old = *c;
2369 *c = ctx;
2371 return (old);
2372 } /* void plugin_set_ctx */
2374 cdtime_t plugin_get_interval (void)
2375 {
2376 cdtime_t interval;
2378 interval = plugin_get_ctx().interval;
2379 if (interval > 0)
2380 return interval;
2382 return cf_get_default_interval ();
2383 } /* cdtime_t plugin_get_interval */
2385 typedef struct {
2386 plugin_ctx_t ctx;
2387 void *(*start_routine) (void *);
2388 void *arg;
2389 } plugin_thread_t;
2391 static void *plugin_thread_start (void *arg)
2392 {
2393 plugin_thread_t *plugin_thread = arg;
2395 void *(*start_routine) (void *) = plugin_thread->start_routine;
2396 void *plugin_arg = plugin_thread->arg;
2398 plugin_set_ctx (plugin_thread->ctx);
2400 free (plugin_thread);
2402 return start_routine (plugin_arg);
2403 } /* void *plugin_thread_start */
2405 int plugin_thread_create (pthread_t *thread, const pthread_attr_t *attr,
2406 void *(*start_routine) (void *), void *arg)
2407 {
2408 plugin_thread_t *plugin_thread;
2410 plugin_thread = malloc (sizeof (*plugin_thread));
2411 if (plugin_thread == NULL)
2412 return -1;
2414 plugin_thread->ctx = plugin_get_ctx ();
2415 plugin_thread->start_routine = start_routine;
2416 plugin_thread->arg = arg;
2418 return pthread_create (thread, attr,
2419 plugin_thread_start, plugin_thread);
2420 } /* int plugin_thread_create */
2422 /* vim: set sw=8 ts=8 noet fdm=marker : */