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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"
34 #include "utils_random.h"
36 #if HAVE_PTHREAD_H
37 # include <pthread.h>
38 #endif
40 #include <ltdl.h>
42 /*
43 * Private structures
44 */
45 struct callback_func_s
46 {
47 void *cf_callback;
48 user_data_t cf_udata;
49 plugin_ctx_t cf_ctx;
50 };
51 typedef struct callback_func_s callback_func_t;
53 #define RF_SIMPLE 0
54 #define RF_COMPLEX 1
55 #define RF_REMOVE 65535
56 struct read_func_s
57 {
58 /* `read_func_t' "inherits" from `callback_func_t'.
59 * The `rf_super' member MUST be the first one in this structure! */
60 #define rf_callback rf_super.cf_callback
61 #define rf_udata rf_super.cf_udata
62 #define rf_ctx rf_super.cf_ctx
63 callback_func_t rf_super;
64 char rf_group[DATA_MAX_NAME_LEN];
65 char *rf_name;
66 int rf_type;
67 cdtime_t rf_interval;
68 cdtime_t rf_effective_interval;
69 cdtime_t rf_next_read;
70 };
71 typedef struct read_func_s read_func_t;
73 struct write_queue_s;
74 typedef struct write_queue_s write_queue_t;
75 struct write_queue_s
76 {
77 value_list_t *vl;
78 plugin_ctx_t ctx;
79 write_queue_t *next;
80 };
82 /*
83 * Private variables
84 */
85 static c_avl_tree_t *plugins_loaded = NULL;
87 static llist_t *list_init;
88 static llist_t *list_write;
89 static llist_t *list_flush;
90 static llist_t *list_missing;
91 static llist_t *list_shutdown;
92 static llist_t *list_log;
93 static llist_t *list_notification;
95 static fc_chain_t *pre_cache_chain = NULL;
96 static fc_chain_t *post_cache_chain = NULL;
98 static c_avl_tree_t *data_sets;
100 static char *plugindir = NULL;
102 static c_heap_t *read_heap = NULL;
103 static llist_t *read_list;
104 static int read_loop = 1;
105 static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
106 static pthread_cond_t read_cond = PTHREAD_COND_INITIALIZER;
107 static pthread_t *read_threads = NULL;
108 static int read_threads_num = 0;
110 static write_queue_t *write_queue_head;
111 static write_queue_t *write_queue_tail;
112 static long write_queue_length = 0;
113 static _Bool write_loop = 1;
114 static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
115 static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER;
116 static pthread_t *write_threads = NULL;
117 static size_t write_threads_num = 0;
119 static pthread_key_t plugin_ctx_key;
120 static _Bool plugin_ctx_key_initialized = 0;
122 static long write_limit_high = 0;
123 static long write_limit_low = 0;
125 /*
126 * Static functions
127 */
128 static int plugin_dispatch_values_internal (value_list_t *vl);
130 static const char *plugin_get_dir (void)
131 {
132 if (plugindir == NULL)
133 return (PLUGINDIR);
134 else
135 return (plugindir);
136 }
138 static void destroy_callback (callback_func_t *cf) /* {{{ */
139 {
140 if (cf == NULL)
141 return;
143 if ((cf->cf_udata.data != NULL) && (cf->cf_udata.free_func != NULL))
144 {
145 cf->cf_udata.free_func (cf->cf_udata.data);
146 cf->cf_udata.data = NULL;
147 cf->cf_udata.free_func = NULL;
148 }
149 sfree (cf);
150 } /* }}} void destroy_callback */
152 static void destroy_all_callbacks (llist_t **list) /* {{{ */
153 {
154 llentry_t *le;
156 if (*list == NULL)
157 return;
159 le = llist_head (*list);
160 while (le != NULL)
161 {
162 llentry_t *le_next;
164 le_next = le->next;
166 sfree (le->key);
167 destroy_callback (le->value);
168 le->value = NULL;
170 le = le_next;
171 }
173 llist_destroy (*list);
174 *list = NULL;
175 } /* }}} void destroy_all_callbacks */
177 static void destroy_read_heap (void) /* {{{ */
178 {
179 if (read_heap == NULL)
180 return;
182 while (42)
183 {
184 callback_func_t *cf;
186 cf = c_heap_get_root (read_heap);
187 if (cf == NULL)
188 break;
190 destroy_callback (cf);
191 }
193 c_heap_destroy (read_heap);
194 read_heap = NULL;
195 } /* }}} void destroy_read_heap */
197 static int register_callback (llist_t **list, /* {{{ */
198 const char *name, callback_func_t *cf)
199 {
200 llentry_t *le;
201 char *key;
203 if (*list == NULL)
204 {
205 *list = llist_create ();
206 if (*list == NULL)
207 {
208 ERROR ("plugin: register_callback: "
209 "llist_create failed.");
210 destroy_callback (cf);
211 return (-1);
212 }
213 }
215 key = strdup (name);
216 if (key == NULL)
217 {
218 ERROR ("plugin: register_callback: strdup failed.");
219 destroy_callback (cf);
220 return (-1);
221 }
223 le = llist_search (*list, name);
224 if (le == NULL)
225 {
226 le = llentry_create (key, cf);
227 if (le == NULL)
228 {
229 ERROR ("plugin: register_callback: "
230 "llentry_create failed.");
231 free (key);
232 destroy_callback (cf);
233 return (-1);
234 }
236 llist_append (*list, le);
237 }
238 else
239 {
240 callback_func_t *old_cf;
242 old_cf = le->value;
243 le->value = cf;
245 WARNING ("plugin: register_callback: "
246 "a callback named `%s' already exists - "
247 "overwriting the old entry!", name);
249 destroy_callback (old_cf);
250 sfree (key);
251 }
253 return (0);
254 } /* }}} int register_callback */
256 static int create_register_callback (llist_t **list, /* {{{ */
257 const char *name, void *callback, user_data_t *ud)
258 {
259 callback_func_t *cf;
261 cf = (callback_func_t *) malloc (sizeof (*cf));
262 if (cf == NULL)
263 {
264 ERROR ("plugin: create_register_callback: malloc failed.");
265 return (-1);
266 }
267 memset (cf, 0, sizeof (*cf));
269 cf->cf_callback = callback;
270 if (ud == NULL)
271 {
272 cf->cf_udata.data = NULL;
273 cf->cf_udata.free_func = NULL;
274 }
275 else
276 {
277 cf->cf_udata = *ud;
278 }
280 cf->cf_ctx = plugin_get_ctx ();
282 return (register_callback (list, name, cf));
283 } /* }}} int create_register_callback */
285 static int plugin_unregister (llist_t *list, const char *name) /* {{{ */
286 {
287 llentry_t *e;
289 if (list == NULL)
290 return (-1);
292 e = llist_search (list, name);
293 if (e == NULL)
294 return (-1);
296 llist_remove (list, e);
298 sfree (e->key);
299 destroy_callback (e->value);
301 llentry_destroy (e);
303 return (0);
304 } /* }}} int plugin_unregister */
306 /*
307 * (Try to) load the shared object `file'. Won't complain if it isn't a shared
308 * object, but it will bitch about a shared object not having a
309 * ``module_register'' symbol..
310 */
311 static int plugin_load_file (char *file, uint32_t flags)
312 {
313 lt_dlhandle dlh;
314 void (*reg_handle) (void);
316 lt_dlinit ();
317 lt_dlerror (); /* clear errors */
319 #if LIBTOOL_VERSION == 2
320 if (flags & PLUGIN_FLAGS_GLOBAL) {
321 lt_dladvise advise;
322 lt_dladvise_init(&advise);
323 lt_dladvise_global(&advise);
324 dlh = lt_dlopenadvise(file, advise);
325 lt_dladvise_destroy(&advise);
326 } else {
327 dlh = lt_dlopen (file);
328 }
329 #else /* if LIBTOOL_VERSION == 1 */
330 if (flags & PLUGIN_FLAGS_GLOBAL)
331 WARNING ("plugin_load_file: The global flag is not supported, "
332 "libtool 2 is required for this.");
333 dlh = lt_dlopen (file);
334 #endif
336 if (dlh == NULL)
337 {
338 char errbuf[1024] = "";
340 ssnprintf (errbuf, sizeof (errbuf),
341 "lt_dlopen (\"%s\") failed: %s. "
342 "The most common cause for this problem is "
343 "missing dependencies. Use ldd(1) to check "
344 "the dependencies of the plugin "
345 "/ shared object.",
346 file, lt_dlerror ());
348 ERROR ("%s", errbuf);
349 /* Make sure this is printed to STDERR in any case, but also
350 * make sure it's printed only once. */
351 if (list_log != NULL)
352 fprintf (stderr, "ERROR: %s\n", errbuf);
354 return (1);
355 }
357 if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
358 {
359 WARNING ("Couldn't find symbol \"module_register\" in \"%s\": %s\n",
360 file, lt_dlerror ());
361 lt_dlclose (dlh);
362 return (-1);
363 }
365 (*reg_handle) ();
367 return (0);
368 }
370 static void *plugin_read_thread (void __attribute__((unused)) *args)
371 {
372 while (read_loop != 0)
373 {
374 read_func_t *rf;
375 plugin_ctx_t old_ctx;
376 cdtime_t now;
377 int status;
378 int rf_type;
379 int rc;
381 /* Get the read function that needs to be read next.
382 * We don't need to hold "read_lock" for the heap, but we need
383 * to call c_heap_get_root() and pthread_cond_wait() in the
384 * same protected block. */
385 pthread_mutex_lock (&read_lock);
386 rf = c_heap_get_root (read_heap);
387 if (rf == NULL)
388 {
389 pthread_cond_wait (&read_cond, &read_lock);
390 pthread_mutex_unlock (&read_lock);
391 continue;
392 }
393 pthread_mutex_unlock (&read_lock);
395 if (rf->rf_interval == 0)
396 {
397 /* this should not happen, because the interval is set
398 * for each plugin when loading it
399 * XXX: issue a warning? */
400 rf->rf_interval = plugin_get_interval ();
401 rf->rf_effective_interval = rf->rf_interval;
403 rf->rf_next_read = cdtime ();
404 }
406 /* sleep until this entry is due,
407 * using pthread_cond_timedwait */
408 pthread_mutex_lock (&read_lock);
409 /* In pthread_cond_timedwait, spurious wakeups are possible
410 * (and really happen, at least on NetBSD with > 1 CPU), thus
411 * we need to re-evaluate the condition every time
412 * pthread_cond_timedwait returns. */
413 rc = 0;
414 while ((read_loop != 0)
415 && (cdtime () < rf->rf_next_read)
416 && rc == 0)
417 {
418 struct timespec ts = { 0 };
420 CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
422 rc = pthread_cond_timedwait (&read_cond, &read_lock,
423 &ts);
424 }
426 /* Must hold `read_lock' when accessing `rf->rf_type'. */
427 rf_type = rf->rf_type;
428 pthread_mutex_unlock (&read_lock);
430 /* Check if we're supposed to stop.. This may have interrupted
431 * the sleep, too. */
432 if (read_loop == 0)
433 {
434 /* Insert `rf' again, so it can be free'd correctly */
435 c_heap_insert (read_heap, rf);
436 break;
437 }
439 /* The entry has been marked for deletion. The linked list
440 * entry has already been removed by `plugin_unregister_read'.
441 * All we have to do here is free the `read_func_t' and
442 * continue. */
443 if (rf_type == RF_REMOVE)
444 {
445 DEBUG ("plugin_read_thread: Destroying the `%s' "
446 "callback.", rf->rf_name);
447 sfree (rf->rf_name);
448 destroy_callback ((callback_func_t *) rf);
449 rf = NULL;
450 continue;
451 }
453 DEBUG ("plugin_read_thread: Handling `%s'.", rf->rf_name);
455 old_ctx = plugin_set_ctx (rf->rf_ctx);
457 if (rf_type == RF_SIMPLE)
458 {
459 int (*callback) (void);
461 callback = rf->rf_callback;
462 status = (*callback) ();
463 }
464 else
465 {
466 plugin_read_cb callback;
468 assert (rf_type == RF_COMPLEX);
470 callback = rf->rf_callback;
471 status = (*callback) (&rf->rf_udata);
472 }
474 plugin_set_ctx (old_ctx);
476 /* If the function signals failure, we will increase the
477 * intervals in which it will be called. */
478 if (status != 0)
479 {
480 rf->rf_effective_interval *= 2;
481 if (rf->rf_effective_interval > TIME_T_TO_CDTIME_T (86400))
482 rf->rf_effective_interval = TIME_T_TO_CDTIME_T (86400);
484 NOTICE ("read-function of plugin `%s' failed. "
485 "Will suspend it for %.3f seconds.",
486 rf->rf_name,
487 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
488 }
489 else
490 {
491 /* Success: Restore the interval, if it was changed. */
492 rf->rf_effective_interval = rf->rf_interval;
493 }
495 /* update the ``next read due'' field */
496 now = cdtime ();
498 DEBUG ("plugin_read_thread: Effective interval of the "
499 "%s plugin is %.3f seconds.",
500 rf->rf_name,
501 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
503 /* Calculate the next (absolute) time at which this function
504 * should be called. */
505 rf->rf_next_read += rf->rf_effective_interval;
507 /* Check, if `rf_next_read' is in the past. */
508 if (rf->rf_next_read < now)
509 {
510 /* `rf_next_read' is in the past. Insert `now'
511 * so this value doesn't trail off into the
512 * past too much. */
513 rf->rf_next_read = now;
514 }
516 DEBUG ("plugin_read_thread: Next read of the %s plugin at %.3f.",
517 rf->rf_name,
518 CDTIME_T_TO_DOUBLE (rf->rf_next_read));
520 /* Re-insert this read function into the heap again. */
521 c_heap_insert (read_heap, rf);
522 } /* while (read_loop) */
524 pthread_exit (NULL);
525 return ((void *) 0);
526 } /* void *plugin_read_thread */
528 static void start_read_threads (int num)
529 {
530 int i;
532 if (read_threads != NULL)
533 return;
535 read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
536 if (read_threads == NULL)
537 {
538 ERROR ("plugin: start_read_threads: calloc failed.");
539 return;
540 }
542 read_threads_num = 0;
543 for (i = 0; i < num; i++)
544 {
545 if (pthread_create (read_threads + read_threads_num, NULL,
546 plugin_read_thread, NULL) == 0)
547 {
548 read_threads_num++;
549 }
550 else
551 {
552 ERROR ("plugin: start_read_threads: pthread_create failed.");
553 return;
554 }
555 } /* for (i) */
556 } /* void start_read_threads */
558 static void stop_read_threads (void)
559 {
560 int i;
562 if (read_threads == NULL)
563 return;
565 INFO ("collectd: Stopping %i read threads.", read_threads_num);
567 pthread_mutex_lock (&read_lock);
568 read_loop = 0;
569 DEBUG ("plugin: stop_read_threads: Signalling `read_cond'");
570 pthread_cond_broadcast (&read_cond);
571 pthread_mutex_unlock (&read_lock);
573 for (i = 0; i < read_threads_num; i++)
574 {
575 if (pthread_join (read_threads[i], NULL) != 0)
576 {
577 ERROR ("plugin: stop_read_threads: pthread_join failed.");
578 }
579 read_threads[i] = (pthread_t) 0;
580 }
581 sfree (read_threads);
582 read_threads_num = 0;
583 } /* void stop_read_threads */
585 static void plugin_value_list_free (value_list_t *vl) /* {{{ */
586 {
587 if (vl == NULL)
588 return;
590 meta_data_destroy (vl->meta);
591 sfree (vl->values);
592 sfree (vl);
593 } /* }}} void plugin_value_list_free */
595 static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
596 {
597 value_list_t *vl;
599 if (vl_orig == NULL)
600 return (NULL);
602 vl = malloc (sizeof (*vl));
603 if (vl == NULL)
604 return (NULL);
605 memcpy (vl, vl_orig, sizeof (*vl));
607 vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
608 if (vl->values == NULL)
609 {
610 plugin_value_list_free (vl);
611 return (NULL);
612 }
613 memcpy (vl->values, vl_orig->values,
614 vl_orig->values_len * sizeof (*vl->values));
616 vl->meta = meta_data_clone (vl->meta);
617 if ((vl_orig->meta != NULL) && (vl->meta == NULL))
618 {
619 plugin_value_list_free (vl);
620 return (NULL);
621 }
623 if (vl->time == 0)
624 vl->time = cdtime ();
626 /* Fill in the interval from the thread context, if it is zero. */
627 if (vl->interval == 0)
628 {
629 plugin_ctx_t ctx = plugin_get_ctx ();
631 if (ctx.interval != 0)
632 vl->interval = ctx.interval;
633 else
634 {
635 char name[6 * DATA_MAX_NAME_LEN];
636 FORMAT_VL (name, sizeof (name), vl);
637 ERROR ("plugin_value_list_clone: Unable to determine "
638 "interval from context for "
639 "value list \"%s\". "
640 "This indicates a broken plugin. "
641 "Please report this problem to the "
642 "collectd mailing list or at "
643 "<http://collectd.org/bugs/>.", name);
644 vl->interval = cf_get_default_interval ();
645 }
646 }
648 return (vl);
649 } /* }}} value_list_t *plugin_value_list_clone */
651 static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
652 {
653 write_queue_t *q;
655 q = malloc (sizeof (*q));
656 if (q == NULL)
657 return (ENOMEM);
658 q->next = NULL;
660 q->vl = plugin_value_list_clone (vl);
661 if (q->vl == NULL)
662 {
663 sfree (q);
664 return (ENOMEM);
665 }
667 /* Store context of caller (read plugin); otherwise, it would not be
668 * available to the write plugins when actually dispatching the
669 * value-list later on. */
670 q->ctx = plugin_get_ctx ();
672 pthread_mutex_lock (&write_lock);
674 if (write_queue_tail == NULL)
675 {
676 write_queue_head = q;
677 write_queue_tail = q;
678 write_queue_length = 1;
679 }
680 else
681 {
682 write_queue_tail->next = q;
683 write_queue_tail = q;
684 write_queue_length += 1;
685 }
687 pthread_cond_signal (&write_cond);
688 pthread_mutex_unlock (&write_lock);
690 return (0);
691 } /* }}} int plugin_write_enqueue */
693 static value_list_t *plugin_write_dequeue (void) /* {{{ */
694 {
695 write_queue_t *q;
696 value_list_t *vl;
698 pthread_mutex_lock (&write_lock);
700 while (write_loop && (write_queue_head == NULL))
701 pthread_cond_wait (&write_cond, &write_lock);
703 if (write_queue_head == NULL)
704 {
705 pthread_mutex_unlock (&write_lock);
706 return (NULL);
707 }
709 q = write_queue_head;
710 write_queue_head = q->next;
711 write_queue_length -= 1;
712 if (write_queue_head == NULL) {
713 write_queue_tail = NULL;
714 assert(0 == write_queue_length);
715 }
717 pthread_mutex_unlock (&write_lock);
719 (void) plugin_set_ctx (q->ctx);
721 vl = q->vl;
722 sfree (q);
723 return (vl);
724 } /* }}} value_list_t *plugin_write_dequeue */
726 static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
727 {
728 while (write_loop)
729 {
730 value_list_t *vl = plugin_write_dequeue ();
731 if (vl == NULL)
732 continue;
734 plugin_dispatch_values_internal (vl);
736 plugin_value_list_free (vl);
737 }
739 pthread_exit (NULL);
740 return ((void *) 0);
741 } /* }}} void *plugin_write_thread */
743 static void start_write_threads (size_t num) /* {{{ */
744 {
745 size_t i;
747 if (write_threads != NULL)
748 return;
750 write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
751 if (write_threads == NULL)
752 {
753 ERROR ("plugin: start_write_threads: calloc failed.");
754 return;
755 }
757 write_threads_num = 0;
758 for (i = 0; i < num; i++)
759 {
760 int status;
762 status = pthread_create (write_threads + write_threads_num,
763 /* attr = */ NULL,
764 plugin_write_thread,
765 /* arg = */ NULL);
766 if (status != 0)
767 {
768 char errbuf[1024];
769 ERROR ("plugin: start_write_threads: pthread_create failed "
770 "with status %i (%s).", status,
771 sstrerror (status, errbuf, sizeof (errbuf)));
772 return;
773 }
775 write_threads_num++;
776 } /* for (i) */
777 } /* }}} void start_write_threads */
779 static void stop_write_threads (void) /* {{{ */
780 {
781 write_queue_t *q;
782 int i;
784 if (write_threads == NULL)
785 return;
787 INFO ("collectd: Stopping %zu write threads.", write_threads_num);
789 pthread_mutex_lock (&write_lock);
790 write_loop = 0;
791 DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
792 pthread_cond_broadcast (&write_cond);
793 pthread_mutex_unlock (&write_lock);
795 for (i = 0; i < write_threads_num; i++)
796 {
797 if (pthread_join (write_threads[i], NULL) != 0)
798 {
799 ERROR ("plugin: stop_write_threads: pthread_join failed.");
800 }
801 write_threads[i] = (pthread_t) 0;
802 }
803 sfree (write_threads);
804 write_threads_num = 0;
806 pthread_mutex_lock (&write_lock);
807 i = 0;
808 for (q = write_queue_head; q != NULL; )
809 {
810 write_queue_t *q1 = q;
811 plugin_value_list_free (q->vl);
812 q = q->next;
813 sfree (q1);
814 i++;
815 }
816 write_queue_head = NULL;
817 write_queue_tail = NULL;
818 write_queue_length = 0;
819 pthread_mutex_unlock (&write_lock);
821 if (i > 0)
822 {
823 WARNING ("plugin: %i value list%s left after shutting down "
824 "the write threads.",
825 i, (i == 1) ? " was" : "s were");
826 }
827 } /* }}} void stop_write_threads */
829 /*
830 * Public functions
831 */
832 void plugin_set_dir (const char *dir)
833 {
834 if (plugindir != NULL)
835 free (plugindir);
837 if (dir == NULL)
838 plugindir = NULL;
839 else if ((plugindir = strdup (dir)) == NULL)
840 {
841 char errbuf[1024];
842 ERROR ("strdup failed: %s",
843 sstrerror (errno, errbuf, sizeof (errbuf)));
844 }
845 }
847 static _Bool plugin_is_loaded (char const *name)
848 {
849 int status;
851 if (plugins_loaded == NULL)
852 plugins_loaded = c_avl_create ((void *) strcasecmp);
853 assert (plugins_loaded != NULL);
855 status = c_avl_get (plugins_loaded, name, /* ret_value = */ NULL);
856 return (status == 0);
857 }
859 static int plugin_mark_loaded (char const *name)
860 {
861 char *name_copy;
862 int status;
864 name_copy = strdup (name);
865 if (name_copy == NULL)
866 return (ENOMEM);
868 status = c_avl_insert (plugins_loaded,
869 /* key = */ name_copy, /* value = */ NULL);
870 return (status);
871 }
873 static void plugin_free_loaded ()
874 {
875 void *key;
876 void *value;
878 if (plugins_loaded == NULL)
879 return;
881 while (c_avl_pick (plugins_loaded, &key, &value) == 0)
882 {
883 sfree (key);
884 assert (value == NULL);
885 }
887 c_avl_destroy (plugins_loaded);
888 plugins_loaded = NULL;
889 }
891 #define BUFSIZE 512
892 int plugin_load (char const *plugin_name, uint32_t flags)
893 {
894 DIR *dh;
895 const char *dir;
896 char filename[BUFSIZE] = "";
897 char typename[BUFSIZE];
898 int ret;
899 struct stat statbuf;
900 struct dirent *de;
901 int status;
903 if (plugin_name == NULL)
904 return (EINVAL);
906 /* Check if plugin is already loaded and don't do anything in this
907 * case. */
908 if (plugin_is_loaded (plugin_name))
909 return (0);
911 dir = plugin_get_dir ();
912 ret = 1;
914 /*
915 * XXX: Magic at work:
916 *
917 * Some of the language bindings, for example the Python and Perl
918 * plugins, need to be able to export symbols to the scripts they run.
919 * For this to happen, the "Globals" flag needs to be set.
920 * Unfortunately, this technical detail is hard to explain to the
921 * average user and she shouldn't have to worry about this, ideally.
922 * So in order to save everyone's sanity use a different default for a
923 * handful of special plugins. --octo
924 */
925 if ((strcasecmp ("perl", plugin_name) == 0)
926 || (strcasecmp ("python", plugin_name) == 0))
927 flags |= PLUGIN_FLAGS_GLOBAL;
929 /* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
930 * type when matching the filename */
931 status = ssnprintf (typename, sizeof (typename), "%s.so", plugin_name);
932 if ((status < 0) || ((size_t) status >= sizeof (typename)))
933 {
934 WARNING ("plugin_load: Filename too long: \"%s.so\"", plugin_name);
935 return (-1);
936 }
938 if ((dh = opendir (dir)) == NULL)
939 {
940 char errbuf[1024];
941 ERROR ("plugin_load: opendir (%s) failed: %s", dir,
942 sstrerror (errno, errbuf, sizeof (errbuf)));
943 return (-1);
944 }
946 while ((de = readdir (dh)) != NULL)
947 {
948 if (strcasecmp (de->d_name, typename))
949 continue;
951 status = ssnprintf (filename, sizeof (filename),
952 "%s/%s", dir, de->d_name);
953 if ((status < 0) || ((size_t) status >= sizeof (filename)))
954 {
955 WARNING ("plugin_load: Filename too long: \"%s/%s\"",
956 dir, de->d_name);
957 continue;
958 }
960 if (lstat (filename, &statbuf) == -1)
961 {
962 char errbuf[1024];
963 WARNING ("plugin_load: stat (\"%s\") failed: %s",
964 filename,
965 sstrerror (errno, errbuf, sizeof (errbuf)));
966 continue;
967 }
968 else if (!S_ISREG (statbuf.st_mode))
969 {
970 /* don't follow symlinks */
971 WARNING ("plugin_load: %s is not a regular file.",
972 filename);
973 continue;
974 }
976 status = plugin_load_file (filename, flags);
977 if (status == 0)
978 {
979 /* success */
980 plugin_mark_loaded (plugin_name);
981 ret = 0;
982 break;
983 }
984 else
985 {
986 ERROR ("plugin_load: Load plugin \"%s\" failed with "
987 "status %i.", plugin_name, status);
988 }
989 }
991 closedir (dh);
993 if (filename[0] == 0)
994 ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
995 plugin_name, dir);
997 return (ret);
998 }
1000 /*
1001 * The `register_*' functions follow
1002 */
1003 int plugin_register_config (const char *name,
1004 int (*callback) (const char *key, const char *val),
1005 const char **keys, int keys_num)
1006 {
1007 cf_register (name, callback, keys, keys_num);
1008 return (0);
1009 } /* int plugin_register_config */
1011 int plugin_register_complex_config (const char *type,
1012 int (*callback) (oconfig_item_t *))
1013 {
1014 return (cf_register_complex (type, callback));
1015 } /* int plugin_register_complex_config */
1017 int plugin_register_init (const char *name,
1018 int (*callback) (void))
1019 {
1020 return (create_register_callback (&list_init, name, (void *) callback,
1021 /* user_data = */ NULL));
1022 } /* plugin_register_init */
1024 static int plugin_compare_read_func (const void *arg0, const void *arg1)
1025 {
1026 const read_func_t *rf0;
1027 const read_func_t *rf1;
1029 rf0 = arg0;
1030 rf1 = arg1;
1032 if (rf0->rf_next_read < rf1->rf_next_read)
1033 return (-1);
1034 else if (rf0->rf_next_read > rf1->rf_next_read)
1035 return (1);
1036 else
1037 return (0);
1038 } /* int plugin_compare_read_func */
1040 /* Add a read function to both, the heap and a linked list. The linked list if
1041 * used to look-up read functions, especially for the remove function. The heap
1042 * is used to determine which plugin to read next. */
1043 static int plugin_insert_read (read_func_t *rf)
1044 {
1045 int status;
1046 llentry_t *le;
1048 rf->rf_next_read = cdtime ();
1049 rf->rf_effective_interval = rf->rf_interval;
1051 pthread_mutex_lock (&read_lock);
1053 if (read_list == NULL)
1054 {
1055 read_list = llist_create ();
1056 if (read_list == NULL)
1057 {
1058 pthread_mutex_unlock (&read_lock);
1059 ERROR ("plugin_insert_read: read_list failed.");
1060 return (-1);
1061 }
1062 }
1064 if (read_heap == NULL)
1065 {
1066 read_heap = c_heap_create (plugin_compare_read_func);
1067 if (read_heap == NULL)
1068 {
1069 pthread_mutex_unlock (&read_lock);
1070 ERROR ("plugin_insert_read: c_heap_create failed.");
1071 return (-1);
1072 }
1073 }
1075 le = llist_search (read_list, rf->rf_name);
1076 if (le != NULL)
1077 {
1078 pthread_mutex_unlock (&read_lock);
1079 WARNING ("The read function \"%s\" is already registered. "
1080 "Check for duplicate \"LoadPlugin\" lines "
1081 "in your configuration!",
1082 rf->rf_name);
1083 return (EINVAL);
1084 }
1086 le = llentry_create (rf->rf_name, rf);
1087 if (le == NULL)
1088 {
1089 pthread_mutex_unlock (&read_lock);
1090 ERROR ("plugin_insert_read: llentry_create failed.");
1091 return (-1);
1092 }
1094 status = c_heap_insert (read_heap, rf);
1095 if (status != 0)
1096 {
1097 pthread_mutex_unlock (&read_lock);
1098 ERROR ("plugin_insert_read: c_heap_insert failed.");
1099 llentry_destroy (le);
1100 return (-1);
1101 }
1103 /* This does not fail. */
1104 llist_append (read_list, le);
1106 /* Wake up all the read threads. */
1107 pthread_cond_broadcast (&read_cond);
1108 pthread_mutex_unlock (&read_lock);
1109 return (0);
1110 } /* int plugin_insert_read */
1112 int plugin_register_read (const char *name,
1113 int (*callback) (void))
1114 {
1115 read_func_t *rf;
1116 int status;
1118 rf = malloc (sizeof (*rf));
1119 if (rf == NULL)
1120 {
1121 ERROR ("plugin_register_read: malloc failed.");
1122 return (ENOMEM);
1123 }
1125 memset (rf, 0, sizeof (read_func_t));
1126 rf->rf_callback = (void *) callback;
1127 rf->rf_udata.data = NULL;
1128 rf->rf_udata.free_func = NULL;
1129 rf->rf_ctx = plugin_get_ctx ();
1130 rf->rf_group[0] = '\0';
1131 rf->rf_name = strdup (name);
1132 rf->rf_type = RF_SIMPLE;
1133 rf->rf_interval = plugin_get_interval ();
1135 status = plugin_insert_read (rf);
1136 if (status != 0)
1137 sfree (rf);
1139 return (status);
1140 } /* int plugin_register_read */
1142 int plugin_register_complex_read (const char *group, const char *name,
1143 plugin_read_cb callback,
1144 const struct timespec *interval,
1145 user_data_t *user_data)
1146 {
1147 read_func_t *rf;
1148 int status;
1150 rf = malloc (sizeof (*rf));
1151 if (rf == NULL)
1152 {
1153 ERROR ("plugin_register_complex_read: malloc failed.");
1154 return (ENOMEM);
1155 }
1157 memset (rf, 0, sizeof (read_func_t));
1158 rf->rf_callback = (void *) callback;
1159 if (group != NULL)
1160 sstrncpy (rf->rf_group, group, sizeof (rf->rf_group));
1161 else
1162 rf->rf_group[0] = '\0';
1163 rf->rf_name = strdup (name);
1164 rf->rf_type = RF_COMPLEX;
1165 if (interval != NULL)
1166 rf->rf_interval = TIMESPEC_TO_CDTIME_T (interval);
1167 else
1168 rf->rf_interval = plugin_get_interval ();
1170 /* Set user data */
1171 if (user_data == NULL)
1172 {
1173 rf->rf_udata.data = NULL;
1174 rf->rf_udata.free_func = NULL;
1175 }
1176 else
1177 {
1178 rf->rf_udata = *user_data;
1179 }
1181 rf->rf_ctx = plugin_get_ctx ();
1183 status = plugin_insert_read (rf);
1184 if (status != 0)
1185 sfree (rf);
1187 return (status);
1188 } /* int plugin_register_complex_read */
1190 int plugin_register_write (const char *name,
1191 plugin_write_cb callback, user_data_t *ud)
1192 {
1193 return (create_register_callback (&list_write, name,
1194 (void *) callback, ud));
1195 } /* int plugin_register_write */
1197 int plugin_register_flush (const char *name,
1198 plugin_flush_cb callback, user_data_t *ud)
1199 {
1200 return (create_register_callback (&list_flush, name,
1201 (void *) callback, ud));
1202 } /* int plugin_register_flush */
1204 int plugin_register_missing (const char *name,
1205 plugin_missing_cb callback, user_data_t *ud)
1206 {
1207 return (create_register_callback (&list_missing, name,
1208 (void *) callback, ud));
1209 } /* int plugin_register_missing */
1211 int plugin_register_shutdown (const char *name,
1212 int (*callback) (void))
1213 {
1214 return (create_register_callback (&list_shutdown, name,
1215 (void *) callback, /* user_data = */ NULL));
1216 } /* int plugin_register_shutdown */
1218 static void plugin_free_data_sets (void)
1219 {
1220 void *key;
1221 void *value;
1223 if (data_sets == NULL)
1224 return;
1226 while (c_avl_pick (data_sets, &key, &value) == 0)
1227 {
1228 data_set_t *ds = value;
1229 /* key is a pointer to ds->type */
1231 sfree (ds->ds);
1232 sfree (ds);
1233 }
1235 c_avl_destroy (data_sets);
1236 data_sets = NULL;
1237 } /* void plugin_free_data_sets */
1239 int plugin_register_data_set (const data_set_t *ds)
1240 {
1241 data_set_t *ds_copy;
1242 int i;
1244 if ((data_sets != NULL)
1245 && (c_avl_get (data_sets, ds->type, NULL) == 0))
1246 {
1247 NOTICE ("Replacing DS `%s' with another version.", ds->type);
1248 plugin_unregister_data_set (ds->type);
1249 }
1250 else if (data_sets == NULL)
1251 {
1252 data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1253 if (data_sets == NULL)
1254 return (-1);
1255 }
1257 ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
1258 if (ds_copy == NULL)
1259 return (-1);
1260 memcpy(ds_copy, ds, sizeof (data_set_t));
1262 ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
1263 * ds->ds_num);
1264 if (ds_copy->ds == NULL)
1265 {
1266 free (ds_copy);
1267 return (-1);
1268 }
1270 for (i = 0; i < ds->ds_num; i++)
1271 memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
1273 return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
1274 } /* int plugin_register_data_set */
1276 int plugin_register_log (const char *name,
1277 plugin_log_cb callback, user_data_t *ud)
1278 {
1279 return (create_register_callback (&list_log, name,
1280 (void *) callback, ud));
1281 } /* int plugin_register_log */
1283 int plugin_register_notification (const char *name,
1284 plugin_notification_cb callback, user_data_t *ud)
1285 {
1286 return (create_register_callback (&list_notification, name,
1287 (void *) callback, ud));
1288 } /* int plugin_register_log */
1290 int plugin_unregister_config (const char *name)
1291 {
1292 cf_unregister (name);
1293 return (0);
1294 } /* int plugin_unregister_config */
1296 int plugin_unregister_complex_config (const char *name)
1297 {
1298 cf_unregister_complex (name);
1299 return (0);
1300 } /* int plugin_unregister_complex_config */
1302 int plugin_unregister_init (const char *name)
1303 {
1304 return (plugin_unregister (list_init, name));
1305 }
1307 int plugin_unregister_read (const char *name) /* {{{ */
1308 {
1309 llentry_t *le;
1310 read_func_t *rf;
1312 if (name == NULL)
1313 return (-ENOENT);
1315 pthread_mutex_lock (&read_lock);
1317 if (read_list == NULL)
1318 {
1319 pthread_mutex_unlock (&read_lock);
1320 return (-ENOENT);
1321 }
1323 le = llist_search (read_list, name);
1324 if (le == NULL)
1325 {
1326 pthread_mutex_unlock (&read_lock);
1327 WARNING ("plugin_unregister_read: No such read function: %s",
1328 name);
1329 return (-ENOENT);
1330 }
1332 llist_remove (read_list, le);
1334 rf = le->value;
1335 assert (rf != NULL);
1336 rf->rf_type = RF_REMOVE;
1338 pthread_mutex_unlock (&read_lock);
1340 llentry_destroy (le);
1342 DEBUG ("plugin_unregister_read: Marked `%s' for removal.", name);
1344 return (0);
1345 } /* }}} int plugin_unregister_read */
1347 static int compare_read_func_group (llentry_t *e, void *ud) /* {{{ */
1348 {
1349 read_func_t *rf = e->value;
1350 char *group = ud;
1352 return strcmp (rf->rf_group, (const char *)group);
1353 } /* }}} int compare_read_func_group */
1355 int plugin_unregister_read_group (const char *group) /* {{{ */
1356 {
1357 llentry_t *le;
1358 read_func_t *rf;
1360 int found = 0;
1362 if (group == NULL)
1363 return (-ENOENT);
1365 pthread_mutex_lock (&read_lock);
1367 if (read_list == NULL)
1368 {
1369 pthread_mutex_unlock (&read_lock);
1370 return (-ENOENT);
1371 }
1373 while (42)
1374 {
1375 le = llist_search_custom (read_list,
1376 compare_read_func_group, (void *)group);
1378 if (le == NULL)
1379 break;
1381 ++found;
1383 llist_remove (read_list, le);
1385 rf = le->value;
1386 assert (rf != NULL);
1387 rf->rf_type = RF_REMOVE;
1389 llentry_destroy (le);
1391 DEBUG ("plugin_unregister_read_group: "
1392 "Marked `%s' (group `%s') for removal.",
1393 rf->rf_name, group);
1394 }
1396 pthread_mutex_unlock (&read_lock);
1398 if (found == 0)
1399 {
1400 WARNING ("plugin_unregister_read_group: No such "
1401 "group of read function: %s", group);
1402 return (-ENOENT);
1403 }
1405 return (0);
1406 } /* }}} int plugin_unregister_read_group */
1408 int plugin_unregister_write (const char *name)
1409 {
1410 return (plugin_unregister (list_write, name));
1411 }
1413 int plugin_unregister_flush (const char *name)
1414 {
1415 return (plugin_unregister (list_flush, name));
1416 }
1418 int plugin_unregister_missing (const char *name)
1419 {
1420 return (plugin_unregister (list_missing, name));
1421 }
1423 int plugin_unregister_shutdown (const char *name)
1424 {
1425 return (plugin_unregister (list_shutdown, name));
1426 }
1428 int plugin_unregister_data_set (const char *name)
1429 {
1430 data_set_t *ds;
1432 if (data_sets == NULL)
1433 return (-1);
1435 if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
1436 return (-1);
1438 sfree (ds->ds);
1439 sfree (ds);
1441 return (0);
1442 } /* int plugin_unregister_data_set */
1444 int plugin_unregister_log (const char *name)
1445 {
1446 return (plugin_unregister (list_log, name));
1447 }
1449 int plugin_unregister_notification (const char *name)
1450 {
1451 return (plugin_unregister (list_notification, name));
1452 }
1454 void plugin_init_all (void)
1455 {
1456 char const *chain_name;
1457 long write_threads_num;
1458 llentry_t *le;
1459 int status;
1461 /* Init the value cache */
1462 uc_init ();
1464 chain_name = global_option_get ("PreCacheChain");
1465 pre_cache_chain = fc_chain_get_by_name (chain_name);
1467 chain_name = global_option_get ("PostCacheChain");
1468 post_cache_chain = fc_chain_get_by_name (chain_name);
1470 write_limit_high = global_option_get_long ("WriteQueueLimitHigh",
1471 /* default = */ 0);
1472 if (write_limit_high < 0)
1473 {
1474 ERROR ("WriteQueueLimitHigh must be positive or zero.");
1475 write_limit_high = 0;
1476 }
1478 write_limit_low = global_option_get_long ("WriteQueueLimitLow",
1479 /* default = */ write_limit_high / 2);
1480 if (write_limit_low < 0)
1481 {
1482 ERROR ("WriteQueueLimitLow must be positive or zero.");
1483 write_limit_low = write_limit_high / 2;
1484 }
1485 else if (write_limit_low > write_limit_high)
1486 {
1487 ERROR ("WriteQueueLimitLow must not be larger than "
1488 "WriteQueueLimitHigh.");
1489 write_limit_low = write_limit_high;
1490 }
1492 write_threads_num = global_option_get_long ("WriteThreads",
1493 /* default = */ 5);
1494 if (write_threads_num < 1)
1495 {
1496 ERROR ("WriteThreads must be positive.");
1497 write_threads_num = 5;
1498 }
1500 start_write_threads ((size_t) write_threads_num);
1502 if ((list_init == NULL) && (read_heap == NULL))
1503 return;
1505 /* Calling all init callbacks before checking if read callbacks
1506 * are available allows the init callbacks to register the read
1507 * callback. */
1508 le = llist_head (list_init);
1509 while (le != NULL)
1510 {
1511 callback_func_t *cf;
1512 plugin_init_cb callback;
1513 plugin_ctx_t old_ctx;
1515 cf = le->value;
1516 old_ctx = plugin_set_ctx (cf->cf_ctx);
1517 callback = cf->cf_callback;
1518 status = (*callback) ();
1519 plugin_set_ctx (old_ctx);
1521 if (status != 0)
1522 {
1523 ERROR ("Initialization of plugin `%s' "
1524 "failed with status %i. "
1525 "Plugin will be unloaded.",
1526 le->key, status);
1527 /* Plugins that register read callbacks from the init
1528 * callback should take care of appropriate error
1529 * handling themselves. */
1530 /* FIXME: Unload _all_ functions */
1531 plugin_unregister_read (le->key);
1532 }
1534 le = le->next;
1535 }
1537 /* Start read-threads */
1538 if (read_heap != NULL)
1539 {
1540 const char *rt;
1541 int num;
1542 rt = global_option_get ("ReadThreads");
1543 num = atoi (rt);
1544 if (num != -1)
1545 start_read_threads ((num > 0) ? num : 5);
1546 }
1547 } /* void plugin_init_all */
1549 /* TODO: Rename this function. */
1550 void plugin_read_all (void)
1551 {
1552 uc_check_timeout ();
1554 return;
1555 } /* void plugin_read_all */
1557 /* Read function called when the `-T' command line argument is given. */
1558 int plugin_read_all_once (void)
1559 {
1560 int status;
1561 int return_status = 0;
1563 if (read_heap == NULL)
1564 {
1565 NOTICE ("No read-functions are registered.");
1566 return (0);
1567 }
1569 while (42)
1570 {
1571 read_func_t *rf;
1572 plugin_ctx_t old_ctx;
1574 rf = c_heap_get_root (read_heap);
1575 if (rf == NULL)
1576 break;
1578 old_ctx = plugin_set_ctx (rf->rf_ctx);
1580 if (rf->rf_type == RF_SIMPLE)
1581 {
1582 int (*callback) (void);
1584 callback = rf->rf_callback;
1585 status = (*callback) ();
1586 }
1587 else
1588 {
1589 plugin_read_cb callback;
1591 callback = rf->rf_callback;
1592 status = (*callback) (&rf->rf_udata);
1593 }
1595 plugin_set_ctx (old_ctx);
1597 if (status != 0)
1598 {
1599 NOTICE ("read-function of plugin `%s' failed.",
1600 rf->rf_name);
1601 return_status = -1;
1602 }
1604 destroy_callback ((void *) rf);
1605 }
1607 return (return_status);
1608 } /* int plugin_read_all_once */
1610 int plugin_write (const char *plugin, /* {{{ */
1611 const data_set_t *ds, const value_list_t *vl)
1612 {
1613 llentry_t *le;
1614 int status;
1616 if (vl == NULL)
1617 return (EINVAL);
1619 if (list_write == NULL)
1620 return (ENOENT);
1622 if (ds == NULL)
1623 {
1624 ds = plugin_get_ds (vl->type);
1625 if (ds == NULL)
1626 {
1627 ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
1628 return (ENOENT);
1629 }
1630 }
1632 if (plugin == NULL)
1633 {
1634 int success = 0;
1635 int failure = 0;
1637 le = llist_head (list_write);
1638 while (le != NULL)
1639 {
1640 callback_func_t *cf = le->value;
1641 plugin_write_cb callback;
1643 /* do not switch plugin context; rather keep the context (interval)
1644 * information of the calling read plugin */
1646 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1647 callback = cf->cf_callback;
1648 status = (*callback) (ds, vl, &cf->cf_udata);
1649 if (status != 0)
1650 failure++;
1651 else
1652 success++;
1654 le = le->next;
1655 }
1657 if ((success == 0) && (failure != 0))
1658 status = -1;
1659 else
1660 status = 0;
1661 }
1662 else /* plugin != NULL */
1663 {
1664 callback_func_t *cf;
1665 plugin_write_cb callback;
1667 le = llist_head (list_write);
1668 while (le != NULL)
1669 {
1670 if (strcasecmp (plugin, le->key) == 0)
1671 break;
1673 le = le->next;
1674 }
1676 if (le == NULL)
1677 return (ENOENT);
1679 cf = le->value;
1681 /* do not switch plugin context; rather keep the context (interval)
1682 * information of the calling read plugin */
1684 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1685 callback = cf->cf_callback;
1686 status = (*callback) (ds, vl, &cf->cf_udata);
1687 }
1689 return (status);
1690 } /* }}} int plugin_write */
1692 int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier)
1693 {
1694 llentry_t *le;
1696 if (list_flush == NULL)
1697 return (0);
1699 le = llist_head (list_flush);
1700 while (le != NULL)
1701 {
1702 callback_func_t *cf;
1703 plugin_flush_cb callback;
1704 plugin_ctx_t old_ctx;
1706 if ((plugin != NULL)
1707 && (strcmp (plugin, le->key) != 0))
1708 {
1709 le = le->next;
1710 continue;
1711 }
1713 cf = le->value;
1714 old_ctx = plugin_set_ctx (cf->cf_ctx);
1715 callback = cf->cf_callback;
1717 (*callback) (timeout, identifier, &cf->cf_udata);
1719 plugin_set_ctx (old_ctx);
1721 le = le->next;
1722 }
1723 return (0);
1724 } /* int plugin_flush */
1726 void plugin_shutdown_all (void)
1727 {
1728 llentry_t *le;
1730 stop_read_threads ();
1732 destroy_all_callbacks (&list_init);
1734 pthread_mutex_lock (&read_lock);
1735 llist_destroy (read_list);
1736 read_list = NULL;
1737 pthread_mutex_unlock (&read_lock);
1739 destroy_read_heap ();
1741 plugin_flush (/* plugin = */ NULL,
1742 /* timeout = */ 0,
1743 /* identifier = */ NULL);
1745 le = NULL;
1746 if (list_shutdown != NULL)
1747 le = llist_head (list_shutdown);
1749 while (le != NULL)
1750 {
1751 callback_func_t *cf;
1752 plugin_shutdown_cb callback;
1753 plugin_ctx_t old_ctx;
1755 cf = le->value;
1756 old_ctx = plugin_set_ctx (cf->cf_ctx);
1757 callback = cf->cf_callback;
1759 /* Advance the pointer before calling the callback allows
1760 * shutdown functions to unregister themselves. If done the
1761 * other way around the memory `le' points to will be freed
1762 * after callback returns. */
1763 le = le->next;
1765 (*callback) ();
1767 plugin_set_ctx (old_ctx);
1768 }
1770 stop_write_threads ();
1772 /* Write plugins which use the `user_data' pointer usually need the
1773 * same data available to the flush callback. If this is the case, set
1774 * the free_function to NULL when registering the flush callback and to
1775 * the real free function when registering the write callback. This way
1776 * the data isn't freed twice. */
1777 destroy_all_callbacks (&list_flush);
1778 destroy_all_callbacks (&list_missing);
1779 destroy_all_callbacks (&list_write);
1781 destroy_all_callbacks (&list_notification);
1782 destroy_all_callbacks (&list_shutdown);
1783 destroy_all_callbacks (&list_log);
1785 plugin_free_loaded ();
1786 plugin_free_data_sets ();
1787 } /* void plugin_shutdown_all */
1789 int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
1790 {
1791 llentry_t *le;
1793 if (list_missing == NULL)
1794 return (0);
1796 le = llist_head (list_missing);
1797 while (le != NULL)
1798 {
1799 callback_func_t *cf;
1800 plugin_missing_cb callback;
1801 plugin_ctx_t old_ctx;
1802 int status;
1804 cf = le->value;
1805 old_ctx = plugin_set_ctx (cf->cf_ctx);
1806 callback = cf->cf_callback;
1808 status = (*callback) (vl, &cf->cf_udata);
1809 plugin_set_ctx (old_ctx);
1810 if (status != 0)
1811 {
1812 if (status < 0)
1813 {
1814 ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
1815 "failed with status %i.",
1816 le->key, status);
1817 return (status);
1818 }
1819 else
1820 {
1821 return (0);
1822 }
1823 }
1825 le = le->next;
1826 }
1827 return (0);
1828 } /* int }}} plugin_dispatch_missing */
1830 static int plugin_dispatch_values_internal (value_list_t *vl)
1831 {
1832 int status;
1833 static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
1835 value_t *saved_values;
1836 int saved_values_len;
1838 data_set_t *ds;
1840 int free_meta_data = 0;
1842 if ((vl == NULL) || (vl->type[0] == 0)
1843 || (vl->values == NULL) || (vl->values_len < 1))
1844 {
1845 ERROR ("plugin_dispatch_values: Invalid value list "
1846 "from plugin %s.", vl->plugin);
1847 return (-1);
1848 }
1850 /* Free meta data only if the calling function didn't specify any. In
1851 * this case matches and targets may add some and the calling function
1852 * may not expect (and therefore free) that data. */
1853 if (vl->meta == NULL)
1854 free_meta_data = 1;
1856 if (list_write == NULL)
1857 c_complain_once (LOG_WARNING, &no_write_complaint,
1858 "plugin_dispatch_values: No write callback has been "
1859 "registered. Please load at least one output plugin, "
1860 "if you want the collected data to be stored.");
1862 if (data_sets == NULL)
1863 {
1864 ERROR ("plugin_dispatch_values: No data sets registered. "
1865 "Could the types database be read? Check "
1866 "your `TypesDB' setting!");
1867 return (-1);
1868 }
1870 if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
1871 {
1872 char ident[6 * DATA_MAX_NAME_LEN];
1874 FORMAT_VL (ident, sizeof (ident), vl);
1875 INFO ("plugin_dispatch_values: Dataset not found: %s "
1876 "(from \"%s\"), check your types.db!",
1877 vl->type, ident);
1878 return (-1);
1879 }
1881 /* Assured by plugin_value_list_clone(). The time is determined at
1882 * _enqueue_ time. */
1883 assert (vl->time != 0);
1884 assert (vl->interval != 0);
1886 DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
1887 "host = %s; "
1888 "plugin = %s; plugin_instance = %s; "
1889 "type = %s; type_instance = %s;",
1890 CDTIME_T_TO_DOUBLE (vl->time),
1891 CDTIME_T_TO_DOUBLE (vl->interval),
1892 vl->host,
1893 vl->plugin, vl->plugin_instance,
1894 vl->type, vl->type_instance);
1896 #if COLLECT_DEBUG
1897 assert (0 == strcmp (ds->type, vl->type));
1898 #else
1899 if (0 != strcmp (ds->type, vl->type))
1900 WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
1901 ds->type, vl->type);
1902 #endif
1904 #if COLLECT_DEBUG
1905 assert (ds->ds_num == vl->values_len);
1906 #else
1907 if (ds->ds_num != vl->values_len)
1908 {
1909 ERROR ("plugin_dispatch_values: ds->type = %s: "
1910 "(ds->ds_num = %i) != "
1911 "(vl->values_len = %i)",
1912 ds->type, ds->ds_num, vl->values_len);
1913 return (-1);
1914 }
1915 #endif
1917 escape_slashes (vl->host, sizeof (vl->host));
1918 escape_slashes (vl->plugin, sizeof (vl->plugin));
1919 escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
1920 escape_slashes (vl->type, sizeof (vl->type));
1921 escape_slashes (vl->type_instance, sizeof (vl->type_instance));
1923 /* Copy the values. This way, we can assure `targets' that they get
1924 * dynamically allocated values, which they can free and replace if
1925 * they like. */
1926 if ((pre_cache_chain != NULL) || (post_cache_chain != NULL))
1927 {
1928 saved_values = vl->values;
1929 saved_values_len = vl->values_len;
1931 vl->values = (value_t *) calloc (vl->values_len,
1932 sizeof (*vl->values));
1933 if (vl->values == NULL)
1934 {
1935 ERROR ("plugin_dispatch_values: calloc failed.");
1936 vl->values = saved_values;
1937 return (-1);
1938 }
1939 memcpy (vl->values, saved_values,
1940 vl->values_len * sizeof (*vl->values));
1941 }
1942 else /* if ((pre == NULL) && (post == NULL)) */
1943 {
1944 saved_values = NULL;
1945 saved_values_len = 0;
1946 }
1948 if (pre_cache_chain != NULL)
1949 {
1950 status = fc_process_chain (ds, vl, pre_cache_chain);
1951 if (status < 0)
1952 {
1953 WARNING ("plugin_dispatch_values: Running the "
1954 "pre-cache chain failed with "
1955 "status %i (%#x).",
1956 status, status);
1957 }
1958 else if (status == FC_TARGET_STOP)
1959 {
1960 /* Restore the state of the value_list so that plugins
1961 * don't get confused.. */
1962 if (saved_values != NULL)
1963 {
1964 free (vl->values);
1965 vl->values = saved_values;
1966 vl->values_len = saved_values_len;
1967 }
1968 return (0);
1969 }
1970 }
1972 /* Update the value cache */
1973 uc_update (ds, vl);
1975 if (post_cache_chain != NULL)
1976 {
1977 status = fc_process_chain (ds, vl, post_cache_chain);
1978 if (status < 0)
1979 {
1980 WARNING ("plugin_dispatch_values: Running the "
1981 "post-cache chain failed with "
1982 "status %i (%#x).",
1983 status, status);
1984 }
1985 }
1986 else
1987 fc_default_action (ds, vl);
1989 /* Restore the state of the value_list so that plugins don't get
1990 * confused.. */
1991 if (saved_values != NULL)
1992 {
1993 free (vl->values);
1994 vl->values = saved_values;
1995 vl->values_len = saved_values_len;
1996 }
1998 if ((free_meta_data != 0) && (vl->meta != NULL))
1999 {
2000 meta_data_destroy (vl->meta);
2001 vl->meta = NULL;
2002 }
2004 return (0);
2005 } /* int plugin_dispatch_values_internal */
2007 static double get_drop_probability (void) /* {{{ */
2008 {
2009 long pos;
2010 long size;
2011 long wql;
2013 pthread_mutex_lock (&write_lock);
2014 wql = write_queue_length;
2015 pthread_mutex_unlock (&write_lock);
2017 if (wql < write_limit_low)
2018 return (0.0);
2019 if (wql >= write_limit_high)
2020 return (1.0);
2022 pos = 1 + wql - write_limit_low;
2023 size = 1 + write_limit_high - write_limit_low;
2025 return (((double) pos) / ((double) size));
2026 } /* }}} double get_drop_probability */
2028 static _Bool check_drop_value (void) /* {{{ */
2029 {
2030 static cdtime_t last_message_time = 0;
2031 static pthread_mutex_t last_message_lock = PTHREAD_MUTEX_INITIALIZER;
2033 double p;
2034 double q;
2035 int status;
2037 if (write_limit_high == 0)
2038 return (0);
2040 p = get_drop_probability ();
2041 if (p == 0.0)
2042 return (0);
2044 status = pthread_mutex_trylock (&last_message_lock);
2045 if (status == 0)
2046 {
2047 cdtime_t now;
2049 now = cdtime ();
2050 if ((now - last_message_time) > TIME_T_TO_CDTIME_T (1))
2051 {
2052 last_message_time = now;
2053 ERROR ("plugin_dispatch_values: Low water mark "
2054 "reached. Dropping %.0f%% of metrics.",
2055 100.0 * p);
2056 }
2057 pthread_mutex_unlock (&last_message_lock);
2058 }
2060 if (p == 1.0)
2061 return (1);
2063 q = cdrand_d ();
2064 if (q > p)
2065 return (1);
2066 else
2067 return (0);
2068 } /* }}} _Bool check_drop_value */
2070 int plugin_dispatch_values (value_list_t const *vl)
2071 {
2072 int status;
2074 if (check_drop_value ())
2075 return (0);
2077 status = plugin_write_enqueue (vl);
2078 if (status != 0)
2079 {
2080 char errbuf[1024];
2081 ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
2082 "with status %i (%s).", status,
2083 sstrerror (status, errbuf, sizeof (errbuf)));
2084 return (status);
2085 }
2087 return (0);
2088 }
2090 int plugin_dispatch_notification (const notification_t *notif)
2091 {
2092 llentry_t *le;
2093 /* Possible TODO: Add flap detection here */
2095 DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
2096 "time = %.3f; host = %s;",
2097 notif->severity, notif->message,
2098 CDTIME_T_TO_DOUBLE (notif->time), notif->host);
2100 /* Nobody cares for notifications */
2101 if (list_notification == NULL)
2102 return (-1);
2104 le = llist_head (list_notification);
2105 while (le != NULL)
2106 {
2107 callback_func_t *cf;
2108 plugin_notification_cb callback;
2109 int status;
2111 /* do not switch plugin context; rather keep the context
2112 * (interval) information of the calling plugin */
2114 cf = le->value;
2115 callback = cf->cf_callback;
2116 status = (*callback) (notif, &cf->cf_udata);
2117 if (status != 0)
2118 {
2119 WARNING ("plugin_dispatch_notification: Notification "
2120 "callback %s returned %i.",
2121 le->key, status);
2122 }
2124 le = le->next;
2125 }
2127 return (0);
2128 } /* int plugin_dispatch_notification */
2130 void plugin_log (int level, const char *format, ...)
2131 {
2132 char msg[1024];
2133 va_list ap;
2134 llentry_t *le;
2136 #if !COLLECT_DEBUG
2137 if (level >= LOG_DEBUG)
2138 return;
2139 #endif
2141 va_start (ap, format);
2142 vsnprintf (msg, sizeof (msg), format, ap);
2143 msg[sizeof (msg) - 1] = '\0';
2144 va_end (ap);
2146 if (list_log == NULL)
2147 {
2148 fprintf (stderr, "%s\n", msg);
2149 return;
2150 }
2152 le = llist_head (list_log);
2153 while (le != NULL)
2154 {
2155 callback_func_t *cf;
2156 plugin_log_cb callback;
2158 cf = le->value;
2159 callback = cf->cf_callback;
2161 /* do not switch plugin context; rather keep the context
2162 * (interval) information of the calling plugin */
2164 (*callback) (level, msg, &cf->cf_udata);
2166 le = le->next;
2167 }
2168 } /* void plugin_log */
2170 int parse_log_severity (const char *severity)
2171 {
2172 int log_level = -1;
2174 if ((0 == strcasecmp (severity, "emerg"))
2175 || (0 == strcasecmp (severity, "alert"))
2176 || (0 == strcasecmp (severity, "crit"))
2177 || (0 == strcasecmp (severity, "err")))
2178 log_level = LOG_ERR;
2179 else if (0 == strcasecmp (severity, "warning"))
2180 log_level = LOG_WARNING;
2181 else if (0 == strcasecmp (severity, "notice"))
2182 log_level = LOG_NOTICE;
2183 else if (0 == strcasecmp (severity, "info"))
2184 log_level = LOG_INFO;
2185 #if COLLECT_DEBUG
2186 else if (0 == strcasecmp (severity, "debug"))
2187 log_level = LOG_DEBUG;
2188 #endif /* COLLECT_DEBUG */
2190 return (log_level);
2191 } /* int parse_log_severity */
2193 int parse_notif_severity (const char *severity)
2194 {
2195 int notif_severity = -1;
2197 if (strcasecmp (severity, "FAILURE") == 0)
2198 notif_severity = NOTIF_FAILURE;
2199 else if (strcmp (severity, "OKAY") == 0)
2200 notif_severity = NOTIF_OKAY;
2201 else if ((strcmp (severity, "WARNING") == 0)
2202 || (strcmp (severity, "WARN") == 0))
2203 notif_severity = NOTIF_WARNING;
2205 return (notif_severity);
2206 } /* int parse_notif_severity */
2208 const data_set_t *plugin_get_ds (const char *name)
2209 {
2210 data_set_t *ds;
2212 if (data_sets == NULL)
2213 {
2214 ERROR ("plugin_get_ds: No data sets are defined yet.");
2215 return (NULL);
2216 }
2218 if (c_avl_get (data_sets, name, (void *) &ds) != 0)
2219 {
2220 DEBUG ("No such dataset registered: %s", name);
2221 return (NULL);
2222 }
2224 return (ds);
2225 } /* data_set_t *plugin_get_ds */
2227 static int plugin_notification_meta_add (notification_t *n,
2228 const char *name,
2229 enum notification_meta_type_e type,
2230 const void *value)
2231 {
2232 notification_meta_t *meta;
2233 notification_meta_t *tail;
2235 if ((n == NULL) || (name == NULL) || (value == NULL))
2236 {
2237 ERROR ("plugin_notification_meta_add: A pointer is NULL!");
2238 return (-1);
2239 }
2241 meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
2242 if (meta == NULL)
2243 {
2244 ERROR ("plugin_notification_meta_add: malloc failed.");
2245 return (-1);
2246 }
2247 memset (meta, 0, sizeof (notification_meta_t));
2249 sstrncpy (meta->name, name, sizeof (meta->name));
2250 meta->type = type;
2252 switch (type)
2253 {
2254 case NM_TYPE_STRING:
2255 {
2256 meta->nm_value.nm_string = strdup ((const char *) value);
2257 if (meta->nm_value.nm_string == NULL)
2258 {
2259 ERROR ("plugin_notification_meta_add: strdup failed.");
2260 sfree (meta);
2261 return (-1);
2262 }
2263 break;
2264 }
2265 case NM_TYPE_SIGNED_INT:
2266 {
2267 meta->nm_value.nm_signed_int = *((int64_t *) value);
2268 break;
2269 }
2270 case NM_TYPE_UNSIGNED_INT:
2271 {
2272 meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
2273 break;
2274 }
2275 case NM_TYPE_DOUBLE:
2276 {
2277 meta->nm_value.nm_double = *((double *) value);
2278 break;
2279 }
2280 case NM_TYPE_BOOLEAN:
2281 {
2282 meta->nm_value.nm_boolean = *((_Bool *) value);
2283 break;
2284 }
2285 default:
2286 {
2287 ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
2288 sfree (meta);
2289 return (-1);
2290 }
2291 } /* switch (type) */
2293 meta->next = NULL;
2294 tail = n->meta;
2295 while ((tail != NULL) && (tail->next != NULL))
2296 tail = tail->next;
2298 if (tail == NULL)
2299 n->meta = meta;
2300 else
2301 tail->next = meta;
2303 return (0);
2304 } /* int plugin_notification_meta_add */
2306 int plugin_notification_meta_add_string (notification_t *n,
2307 const char *name,
2308 const char *value)
2309 {
2310 return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
2311 }
2313 int plugin_notification_meta_add_signed_int (notification_t *n,
2314 const char *name,
2315 int64_t value)
2316 {
2317 return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
2318 }
2320 int plugin_notification_meta_add_unsigned_int (notification_t *n,
2321 const char *name,
2322 uint64_t value)
2323 {
2324 return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
2325 }
2327 int plugin_notification_meta_add_double (notification_t *n,
2328 const char *name,
2329 double value)
2330 {
2331 return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
2332 }
2334 int plugin_notification_meta_add_boolean (notification_t *n,
2335 const char *name,
2336 _Bool value)
2337 {
2338 return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
2339 }
2341 int plugin_notification_meta_copy (notification_t *dst,
2342 const notification_t *src)
2343 {
2344 notification_meta_t *meta;
2346 assert (dst != NULL);
2347 assert (src != NULL);
2348 assert (dst != src);
2349 assert ((src->meta == NULL) || (src->meta != dst->meta));
2351 for (meta = src->meta; meta != NULL; meta = meta->next)
2352 {
2353 if (meta->type == NM_TYPE_STRING)
2354 plugin_notification_meta_add_string (dst, meta->name,
2355 meta->nm_value.nm_string);
2356 else if (meta->type == NM_TYPE_SIGNED_INT)
2357 plugin_notification_meta_add_signed_int (dst, meta->name,
2358 meta->nm_value.nm_signed_int);
2359 else if (meta->type == NM_TYPE_UNSIGNED_INT)
2360 plugin_notification_meta_add_unsigned_int (dst, meta->name,
2361 meta->nm_value.nm_unsigned_int);
2362 else if (meta->type == NM_TYPE_DOUBLE)
2363 plugin_notification_meta_add_double (dst, meta->name,
2364 meta->nm_value.nm_double);
2365 else if (meta->type == NM_TYPE_BOOLEAN)
2366 plugin_notification_meta_add_boolean (dst, meta->name,
2367 meta->nm_value.nm_boolean);
2368 }
2370 return (0);
2371 } /* int plugin_notification_meta_copy */
2373 int plugin_notification_meta_free (notification_meta_t *n)
2374 {
2375 notification_meta_t *this;
2376 notification_meta_t *next;
2378 if (n == NULL)
2379 {
2380 ERROR ("plugin_notification_meta_free: n == NULL!");
2381 return (-1);
2382 }
2384 this = n;
2385 while (this != NULL)
2386 {
2387 next = this->next;
2389 if (this->type == NM_TYPE_STRING)
2390 {
2391 free ((char *)this->nm_value.nm_string);
2392 this->nm_value.nm_string = NULL;
2393 }
2394 sfree (this);
2396 this = next;
2397 }
2399 return (0);
2400 } /* int plugin_notification_meta_free */
2402 static void plugin_ctx_destructor (void *ctx)
2403 {
2404 sfree (ctx);
2405 } /* void plugin_ctx_destructor */
2407 static plugin_ctx_t ctx_init = { /* interval = */ 0 };
2409 static plugin_ctx_t *plugin_ctx_create (void)
2410 {
2411 plugin_ctx_t *ctx;
2413 ctx = malloc (sizeof (*ctx));
2414 if (ctx == NULL) {
2415 char errbuf[1024];
2416 ERROR ("Failed to allocate plugin context: %s",
2417 sstrerror (errno, errbuf, sizeof (errbuf)));
2418 return NULL;
2419 }
2421 *ctx = ctx_init;
2422 assert (plugin_ctx_key_initialized);
2423 pthread_setspecific (plugin_ctx_key, ctx);
2424 DEBUG("Created new plugin context.");
2425 return (ctx);
2426 } /* int plugin_ctx_create */
2428 void plugin_init_ctx (void)
2429 {
2430 pthread_key_create (&plugin_ctx_key, plugin_ctx_destructor);
2431 plugin_ctx_key_initialized = 1;
2432 } /* void plugin_init_ctx */
2434 plugin_ctx_t plugin_get_ctx (void)
2435 {
2436 plugin_ctx_t *ctx;
2438 assert (plugin_ctx_key_initialized);
2439 ctx = pthread_getspecific (plugin_ctx_key);
2441 if (ctx == NULL) {
2442 ctx = plugin_ctx_create ();
2443 /* this must no happen -- exit() instead? */
2444 if (ctx == NULL)
2445 return ctx_init;
2446 }
2448 return (*ctx);
2449 } /* plugin_ctx_t plugin_get_ctx */
2451 plugin_ctx_t plugin_set_ctx (plugin_ctx_t ctx)
2452 {
2453 plugin_ctx_t *c;
2454 plugin_ctx_t old;
2456 assert (plugin_ctx_key_initialized);
2457 c = pthread_getspecific (plugin_ctx_key);
2459 if (c == NULL) {
2460 c = plugin_ctx_create ();
2461 /* this must no happen -- exit() instead? */
2462 if (c == NULL)
2463 return ctx_init;
2464 }
2466 old = *c;
2467 *c = ctx;
2469 return (old);
2470 } /* void plugin_set_ctx */
2472 cdtime_t plugin_get_interval (void)
2473 {
2474 cdtime_t interval;
2476 interval = plugin_get_ctx().interval;
2477 if (interval > 0)
2478 return interval;
2480 return cf_get_default_interval ();
2481 } /* cdtime_t plugin_get_interval */
2483 typedef struct {
2484 plugin_ctx_t ctx;
2485 void *(*start_routine) (void *);
2486 void *arg;
2487 } plugin_thread_t;
2489 static void *plugin_thread_start (void *arg)
2490 {
2491 plugin_thread_t *plugin_thread = arg;
2493 void *(*start_routine) (void *) = plugin_thread->start_routine;
2494 void *plugin_arg = plugin_thread->arg;
2496 plugin_set_ctx (plugin_thread->ctx);
2498 free (plugin_thread);
2500 return start_routine (plugin_arg);
2501 } /* void *plugin_thread_start */
2503 int plugin_thread_create (pthread_t *thread, const pthread_attr_t *attr,
2504 void *(*start_routine) (void *), void *arg)
2505 {
2506 plugin_thread_t *plugin_thread;
2508 plugin_thread = malloc (sizeof (*plugin_thread));
2509 if (plugin_thread == NULL)
2510 return -1;
2512 plugin_thread->ctx = plugin_get_ctx ();
2513 plugin_thread->start_routine = start_routine;
2514 plugin_thread->arg = arg;
2516 return pthread_create (thread, attr,
2517 plugin_thread_start, plugin_thread);
2518 } /* int plugin_thread_create */
2520 /* vim: set sw=8 ts=8 noet fdm=marker : */