1 /**
2 * collectd - src/plugin.c
3 * Copyright (C) 2005-2014 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 * Sebastian Harl <sh at tokkee.org>
26 **/
28 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
31 #include "configfile.h"
32 #include "filter_chain.h"
33 #include "utils_avltree.h"
34 #include "utils_cache.h"
35 #include "utils_complain.h"
36 #include "utils_llist.h"
37 #include "utils_heap.h"
38 #include "utils_time.h"
39 #include "utils_random.h"
41 #include <ltdl.h>
43 /*
44 * Private structures
45 */
46 struct callback_func_s
47 {
48 void *cf_callback;
49 user_data_t cf_udata;
50 plugin_ctx_t cf_ctx;
51 };
52 typedef struct callback_func_s callback_func_t;
54 #define RF_SIMPLE 0
55 #define RF_COMPLEX 1
56 #define RF_REMOVE 65535
57 struct read_func_s
58 {
59 /* `read_func_t' "inherits" from `callback_func_t'.
60 * The `rf_super' member MUST be the first one in this structure! */
61 #define rf_callback rf_super.cf_callback
62 #define rf_udata rf_super.cf_udata
63 #define rf_ctx rf_super.cf_ctx
64 callback_func_t rf_super;
65 char rf_group[DATA_MAX_NAME_LEN];
66 char *rf_name;
67 int rf_type;
68 cdtime_t rf_interval;
69 cdtime_t rf_effective_interval;
70 cdtime_t rf_next_read;
71 };
72 typedef struct read_func_s read_func_t;
74 struct write_queue_s;
75 typedef struct write_queue_s write_queue_t;
76 struct write_queue_s
77 {
78 value_list_t *vl;
79 plugin_ctx_t ctx;
80 write_queue_t *next;
81 };
83 struct flush_callback_s {
84 char *name;
85 cdtime_t timeout;
86 };
87 typedef struct flush_callback_s flush_callback_t;
89 /*
90 * Private variables
91 */
92 static c_avl_tree_t *plugins_loaded = NULL;
94 static llist_t *list_init;
95 static llist_t *list_write;
96 static llist_t *list_flush;
97 static llist_t *list_missing;
98 static llist_t *list_shutdown;
99 static llist_t *list_log;
100 static llist_t *list_notification;
102 static fc_chain_t *pre_cache_chain = NULL;
103 static fc_chain_t *post_cache_chain = NULL;
105 static c_avl_tree_t *data_sets;
107 static char *plugindir = NULL;
109 #ifndef DEFAULT_MAX_READ_INTERVAL
110 # define DEFAULT_MAX_READ_INTERVAL TIME_T_TO_CDTIME_T (86400)
111 #endif
112 static c_heap_t *read_heap = NULL;
113 static llist_t *read_list;
114 static int read_loop = 1;
115 static pthread_mutex_t read_lock = PTHREAD_MUTEX_INITIALIZER;
116 static pthread_cond_t read_cond = PTHREAD_COND_INITIALIZER;
117 static pthread_t *read_threads = NULL;
118 static int read_threads_num = 0;
119 static cdtime_t max_read_interval = DEFAULT_MAX_READ_INTERVAL;
121 static write_queue_t *write_queue_head;
122 static write_queue_t *write_queue_tail;
123 static long write_queue_length = 0;
124 static _Bool write_loop = 1;
125 static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER;
126 static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER;
127 static pthread_t *write_threads = NULL;
128 static size_t write_threads_num = 0;
130 static pthread_key_t plugin_ctx_key;
131 static _Bool plugin_ctx_key_initialized = 0;
133 static long write_limit_high = 0;
134 static long write_limit_low = 0;
136 static derive_t stats_values_dropped = 0;
137 static _Bool record_statistics = 0;
139 /*
140 * Static functions
141 */
142 static int plugin_dispatch_values_internal (value_list_t *vl);
144 static const char *plugin_get_dir (void)
145 {
146 if (plugindir == NULL)
147 return (PLUGINDIR);
148 else
149 return (plugindir);
150 }
152 static void plugin_update_internal_statistics (void) { /* {{{ */
153 derive_t copy_write_queue_length;
154 value_list_t vl = VALUE_LIST_INIT;
155 value_t values[2];
157 copy_write_queue_length = write_queue_length;
159 /* Initialize `vl' */
160 vl.values = values;
161 vl.values_len = 2;
162 vl.time = 0;
163 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
164 sstrncpy (vl.plugin, "collectd", sizeof (vl.plugin));
166 vl.type_instance[0] = 0;
167 vl.values_len = 1;
169 /* Write queue */
170 sstrncpy (vl.plugin_instance, "write_queue",
171 sizeof (vl.plugin_instance));
173 /* Write queue : queue length */
174 vl.values[0].gauge = (gauge_t) copy_write_queue_length;
175 sstrncpy (vl.type, "queue_length", sizeof (vl.type));
176 vl.type_instance[0] = 0;
177 plugin_dispatch_values (&vl);
179 /* Write queue : Values dropped (queue length > low limit) */
180 vl.values[0].derive = (derive_t) stats_values_dropped;
181 sstrncpy (vl.type, "derive", sizeof (vl.type));
182 sstrncpy (vl.type_instance, "dropped", sizeof (vl.type_instance));
183 plugin_dispatch_values (&vl);
185 /* Cache */
186 sstrncpy (vl.plugin_instance, "cache",
187 sizeof (vl.plugin_instance));
189 /* Cache : Nb entry in cache tree */
190 vl.values[0].gauge = (gauge_t) uc_get_size();
191 sstrncpy (vl.type, "cache_size", sizeof (vl.type));
192 vl.type_instance[0] = 0;
193 plugin_dispatch_values (&vl);
195 return;
196 } /* }}} void plugin_update_internal_statistics */
198 static void destroy_callback (callback_func_t *cf) /* {{{ */
199 {
200 if (cf == NULL)
201 return;
203 if ((cf->cf_udata.data != NULL) && (cf->cf_udata.free_func != NULL))
204 {
205 cf->cf_udata.free_func (cf->cf_udata.data);
206 cf->cf_udata.data = NULL;
207 cf->cf_udata.free_func = NULL;
208 }
209 sfree (cf);
210 } /* }}} void destroy_callback */
212 static void destroy_all_callbacks (llist_t **list) /* {{{ */
213 {
214 llentry_t *le;
216 if (*list == NULL)
217 return;
219 le = llist_head (*list);
220 while (le != NULL)
221 {
222 llentry_t *le_next;
224 le_next = le->next;
226 sfree (le->key);
227 destroy_callback (le->value);
228 le->value = NULL;
230 le = le_next;
231 }
233 llist_destroy (*list);
234 *list = NULL;
235 } /* }}} void destroy_all_callbacks */
237 static void destroy_read_heap (void) /* {{{ */
238 {
239 if (read_heap == NULL)
240 return;
242 while (42)
243 {
244 read_func_t *rf;
246 rf = c_heap_get_root (read_heap);
247 if (rf == NULL)
248 break;
249 sfree (rf->rf_name);
250 destroy_callback ((callback_func_t *) rf);
251 }
253 c_heap_destroy (read_heap);
254 read_heap = NULL;
255 } /* }}} void destroy_read_heap */
257 static int register_callback (llist_t **list, /* {{{ */
258 const char *name, callback_func_t *cf)
259 {
260 llentry_t *le;
261 char *key;
263 if (*list == NULL)
264 {
265 *list = llist_create ();
266 if (*list == NULL)
267 {
268 ERROR ("plugin: register_callback: "
269 "llist_create failed.");
270 destroy_callback (cf);
271 return (-1);
272 }
273 }
275 key = strdup (name);
276 if (key == NULL)
277 {
278 ERROR ("plugin: register_callback: strdup failed.");
279 destroy_callback (cf);
280 return (-1);
281 }
283 le = llist_search (*list, name);
284 if (le == NULL)
285 {
286 le = llentry_create (key, cf);
287 if (le == NULL)
288 {
289 ERROR ("plugin: register_callback: "
290 "llentry_create failed.");
291 sfree (key);
292 destroy_callback (cf);
293 return (-1);
294 }
296 llist_append (*list, le);
297 }
298 else
299 {
300 callback_func_t *old_cf;
302 old_cf = le->value;
303 le->value = cf;
305 WARNING ("plugin: register_callback: "
306 "a callback named `%s' already exists - "
307 "overwriting the old entry!", name);
309 destroy_callback (old_cf);
310 sfree (key);
311 }
313 return (0);
314 } /* }}} int register_callback */
316 static void log_list_callbacks (llist_t **list, /* {{{ */
317 const char *comment)
318 {
319 char *str;
320 int len;
321 llentry_t *le;
322 int i;
323 int n;
324 char **keys;
326 n = llist_size(*list);
327 if (n == 0)
328 {
329 INFO("%s [none]", comment);
330 return;
331 }
333 keys = calloc(n, sizeof(char*));
335 if (keys == NULL)
336 {
337 ERROR("%s: failed to allocate memory for list of callbacks",
338 comment);
340 return;
341 }
343 for (le = llist_head (*list), i = 0, len = 0;
344 le != NULL;
345 le = le->next, i++)
346 {
347 keys[i] = le->key;
348 len += strlen(le->key) + 6;
349 }
350 str = malloc(len + 10);
351 if (str == NULL)
352 {
353 ERROR("%s: failed to allocate memory for list of callbacks",
354 comment);
355 }
356 else
357 {
358 *str = '\0';
359 strjoin(str, len, keys, n, "', '");
360 INFO("%s ['%s']", comment, str);
361 sfree (str);
362 }
363 sfree (keys);
364 } /* }}} void log_list_callbacks */
366 static int create_register_callback (llist_t **list, /* {{{ */
367 const char *name, void *callback, user_data_t *ud)
368 {
369 callback_func_t *cf;
371 cf = (callback_func_t *) malloc (sizeof (*cf));
372 if (cf == NULL)
373 {
374 ERROR ("plugin: create_register_callback: malloc failed.");
375 return (-1);
376 }
377 memset (cf, 0, sizeof (*cf));
379 cf->cf_callback = callback;
380 if (ud == NULL)
381 {
382 cf->cf_udata.data = NULL;
383 cf->cf_udata.free_func = NULL;
384 }
385 else
386 {
387 cf->cf_udata = *ud;
388 }
390 cf->cf_ctx = plugin_get_ctx ();
392 return (register_callback (list, name, cf));
393 } /* }}} int create_register_callback */
395 static int plugin_unregister (llist_t *list, const char *name) /* {{{ */
396 {
397 llentry_t *e;
399 if (list == NULL)
400 return (-1);
402 e = llist_search (list, name);
403 if (e == NULL)
404 return (-1);
406 llist_remove (list, e);
408 sfree (e->key);
409 destroy_callback (e->value);
411 llentry_destroy (e);
413 return (0);
414 } /* }}} int plugin_unregister */
416 /*
417 * (Try to) load the shared object `file'. Won't complain if it isn't a shared
418 * object, but it will bitch about a shared object not having a
419 * ``module_register'' symbol..
420 */
421 static int plugin_load_file (char *file, uint32_t flags)
422 {
423 lt_dlhandle dlh;
424 void (*reg_handle) (void);
426 lt_dlinit ();
427 lt_dlerror (); /* clear errors */
429 #if LIBTOOL_VERSION == 2
430 if (flags & PLUGIN_FLAGS_GLOBAL) {
431 lt_dladvise advise;
432 lt_dladvise_init(&advise);
433 lt_dladvise_global(&advise);
434 dlh = lt_dlopenadvise(file, advise);
435 lt_dladvise_destroy(&advise);
436 } else {
437 dlh = lt_dlopen (file);
438 }
439 #else /* if LIBTOOL_VERSION == 1 */
440 if (flags & PLUGIN_FLAGS_GLOBAL)
441 WARNING ("plugin_load_file: The global flag is not supported, "
442 "libtool 2 is required for this.");
443 dlh = lt_dlopen (file);
444 #endif
446 if (dlh == NULL)
447 {
448 char errbuf[1024] = "";
450 ssnprintf (errbuf, sizeof (errbuf),
451 "lt_dlopen (\"%s\") failed: %s. "
452 "The most common cause for this problem is "
453 "missing dependencies. Use ldd(1) to check "
454 "the dependencies of the plugin "
455 "/ shared object.",
456 file, lt_dlerror ());
458 ERROR ("%s", errbuf);
459 /* Make sure this is printed to STDERR in any case, but also
460 * make sure it's printed only once. */
461 if (list_log != NULL)
462 fprintf (stderr, "ERROR: %s\n", errbuf);
464 return (1);
465 }
467 if ((reg_handle = (void (*) (void)) lt_dlsym (dlh, "module_register")) == NULL)
468 {
469 WARNING ("Couldn't find symbol \"module_register\" in \"%s\": %s\n",
470 file, lt_dlerror ());
471 lt_dlclose (dlh);
472 return (-1);
473 }
475 (*reg_handle) ();
477 return (0);
478 }
480 static void *plugin_read_thread (void __attribute__((unused)) *args)
481 {
482 while (read_loop != 0)
483 {
484 read_func_t *rf;
485 plugin_ctx_t old_ctx;
486 cdtime_t start;
487 cdtime_t now;
488 cdtime_t elapsed;
489 int status;
490 int rf_type;
491 int rc;
493 /* Get the read function that needs to be read next.
494 * We don't need to hold "read_lock" for the heap, but we need
495 * to call c_heap_get_root() and pthread_cond_wait() in the
496 * same protected block. */
497 pthread_mutex_lock (&read_lock);
498 rf = c_heap_get_root (read_heap);
499 if (rf == NULL)
500 {
501 pthread_cond_wait (&read_cond, &read_lock);
502 pthread_mutex_unlock (&read_lock);
503 continue;
504 }
505 pthread_mutex_unlock (&read_lock);
507 if (rf->rf_interval == 0)
508 {
509 /* this should not happen, because the interval is set
510 * for each plugin when loading it
511 * XXX: issue a warning? */
512 rf->rf_interval = plugin_get_interval ();
513 rf->rf_effective_interval = rf->rf_interval;
515 rf->rf_next_read = cdtime ();
516 }
518 /* sleep until this entry is due,
519 * using pthread_cond_timedwait */
520 pthread_mutex_lock (&read_lock);
521 /* In pthread_cond_timedwait, spurious wakeups are possible
522 * (and really happen, at least on NetBSD with > 1 CPU), thus
523 * we need to re-evaluate the condition every time
524 * pthread_cond_timedwait returns. */
525 rc = 0;
526 while ((read_loop != 0)
527 && (cdtime () < rf->rf_next_read)
528 && rc == 0)
529 {
530 struct timespec ts = { 0 };
532 CDTIME_T_TO_TIMESPEC (rf->rf_next_read, &ts);
534 rc = pthread_cond_timedwait (&read_cond, &read_lock,
535 &ts);
536 }
538 /* Must hold `read_lock' when accessing `rf->rf_type'. */
539 rf_type = rf->rf_type;
540 pthread_mutex_unlock (&read_lock);
542 /* Check if we're supposed to stop.. This may have interrupted
543 * the sleep, too. */
544 if (read_loop == 0)
545 {
546 /* Insert `rf' again, so it can be free'd correctly */
547 c_heap_insert (read_heap, rf);
548 break;
549 }
551 /* The entry has been marked for deletion. The linked list
552 * entry has already been removed by `plugin_unregister_read'.
553 * All we have to do here is free the `read_func_t' and
554 * continue. */
555 if (rf_type == RF_REMOVE)
556 {
557 DEBUG ("plugin_read_thread: Destroying the `%s' "
558 "callback.", rf->rf_name);
559 sfree (rf->rf_name);
560 destroy_callback ((callback_func_t *) rf);
561 rf = NULL;
562 continue;
563 }
565 DEBUG ("plugin_read_thread: Handling `%s'.", rf->rf_name);
567 start = cdtime ();
569 old_ctx = plugin_set_ctx (rf->rf_ctx);
571 if (rf_type == RF_SIMPLE)
572 {
573 int (*callback) (void);
575 callback = rf->rf_callback;
576 status = (*callback) ();
577 }
578 else
579 {
580 plugin_read_cb callback;
582 assert (rf_type == RF_COMPLEX);
584 callback = rf->rf_callback;
585 status = (*callback) (&rf->rf_udata);
586 }
588 plugin_set_ctx (old_ctx);
590 /* If the function signals failure, we will increase the
591 * intervals in which it will be called. */
592 if (status != 0)
593 {
594 rf->rf_effective_interval *= 2;
595 if (rf->rf_effective_interval > max_read_interval)
596 rf->rf_effective_interval = max_read_interval;
598 NOTICE ("read-function of plugin `%s' failed. "
599 "Will suspend it for %.3f seconds.",
600 rf->rf_name,
601 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
602 }
603 else
604 {
605 /* Success: Restore the interval, if it was changed. */
606 rf->rf_effective_interval = rf->rf_interval;
607 }
609 /* update the ``next read due'' field */
610 now = cdtime ();
612 /* calculate the time spent in the read function */
613 elapsed = (now - start);
615 if (elapsed > rf->rf_effective_interval)
616 WARNING ("plugin_read_thread: read-function of the `%s' plugin took %.3f "
617 "seconds, which is above its read interval (%.3f seconds). You might "
618 "want to adjust the `Interval' or `ReadThreads' settings.",
619 rf->rf_name, CDTIME_T_TO_DOUBLE(elapsed),
620 CDTIME_T_TO_DOUBLE(rf->rf_effective_interval));
622 DEBUG ("plugin_read_thread: read-function of the `%s' plugin took "
623 "%.6f seconds.",
624 rf->rf_name, CDTIME_T_TO_DOUBLE(elapsed));
626 DEBUG ("plugin_read_thread: Effective interval of the "
627 "`%s' plugin is %.3f seconds.",
628 rf->rf_name,
629 CDTIME_T_TO_DOUBLE (rf->rf_effective_interval));
631 /* Calculate the next (absolute) time at which this function
632 * should be called. */
633 rf->rf_next_read += rf->rf_effective_interval;
635 /* Check, if `rf_next_read' is in the past. */
636 if (rf->rf_next_read < now)
637 {
638 /* `rf_next_read' is in the past. Insert `now'
639 * so this value doesn't trail off into the
640 * past too much. */
641 rf->rf_next_read = now;
642 }
644 DEBUG ("plugin_read_thread: Next read of the `%s' plugin at %.3f.",
645 rf->rf_name,
646 CDTIME_T_TO_DOUBLE (rf->rf_next_read));
648 /* Re-insert this read function into the heap again. */
649 c_heap_insert (read_heap, rf);
650 } /* while (read_loop) */
652 pthread_exit (NULL);
653 return ((void *) 0);
654 } /* void *plugin_read_thread */
656 static void start_read_threads (int num)
657 {
658 int i;
660 if (read_threads != NULL)
661 return;
663 read_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
664 if (read_threads == NULL)
665 {
666 ERROR ("plugin: start_read_threads: calloc failed.");
667 return;
668 }
670 read_threads_num = 0;
671 for (i = 0; i < num; i++)
672 {
673 if (pthread_create (read_threads + read_threads_num, NULL,
674 plugin_read_thread, NULL) == 0)
675 {
676 read_threads_num++;
677 }
678 else
679 {
680 ERROR ("plugin: start_read_threads: pthread_create failed.");
681 return;
682 }
683 } /* for (i) */
684 } /* void start_read_threads */
686 static void stop_read_threads (void)
687 {
688 int i;
690 if (read_threads == NULL)
691 return;
693 INFO ("collectd: Stopping %i read threads.", read_threads_num);
695 pthread_mutex_lock (&read_lock);
696 read_loop = 0;
697 DEBUG ("plugin: stop_read_threads: Signalling `read_cond'");
698 pthread_cond_broadcast (&read_cond);
699 pthread_mutex_unlock (&read_lock);
701 for (i = 0; i < read_threads_num; i++)
702 {
703 if (pthread_join (read_threads[i], NULL) != 0)
704 {
705 ERROR ("plugin: stop_read_threads: pthread_join failed.");
706 }
707 read_threads[i] = (pthread_t) 0;
708 }
709 sfree (read_threads);
710 read_threads_num = 0;
711 } /* void stop_read_threads */
713 static void plugin_value_list_free (value_list_t *vl) /* {{{ */
714 {
715 if (vl == NULL)
716 return;
718 meta_data_destroy (vl->meta);
719 sfree (vl->values);
720 sfree (vl);
721 } /* }}} void plugin_value_list_free */
723 static value_list_t *plugin_value_list_clone (value_list_t const *vl_orig) /* {{{ */
724 {
725 value_list_t *vl;
727 if (vl_orig == NULL)
728 return (NULL);
730 vl = malloc (sizeof (*vl));
731 if (vl == NULL)
732 return (NULL);
733 memcpy (vl, vl_orig, sizeof (*vl));
735 vl->values = calloc (vl_orig->values_len, sizeof (*vl->values));
736 if (vl->values == NULL)
737 {
738 plugin_value_list_free (vl);
739 return (NULL);
740 }
741 memcpy (vl->values, vl_orig->values,
742 vl_orig->values_len * sizeof (*vl->values));
744 vl->meta = meta_data_clone (vl->meta);
745 if ((vl_orig->meta != NULL) && (vl->meta == NULL))
746 {
747 plugin_value_list_free (vl);
748 return (NULL);
749 }
751 if (vl->time == 0)
752 vl->time = cdtime ();
754 /* Fill in the interval from the thread context, if it is zero. */
755 if (vl->interval == 0)
756 {
757 plugin_ctx_t ctx = plugin_get_ctx ();
759 if (ctx.interval != 0)
760 vl->interval = ctx.interval;
761 else
762 {
763 char name[6 * DATA_MAX_NAME_LEN];
764 FORMAT_VL (name, sizeof (name), vl);
765 ERROR ("plugin_value_list_clone: Unable to determine "
766 "interval from context for "
767 "value list \"%s\". "
768 "This indicates a broken plugin. "
769 "Please report this problem to the "
770 "collectd mailing list or at "
771 "<http://collectd.org/bugs/>.", name);
772 vl->interval = cf_get_default_interval ();
773 }
774 }
776 return (vl);
777 } /* }}} value_list_t *plugin_value_list_clone */
779 static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */
780 {
781 write_queue_t *q;
783 q = malloc (sizeof (*q));
784 if (q == NULL)
785 return (ENOMEM);
786 q->next = NULL;
788 q->vl = plugin_value_list_clone (vl);
789 if (q->vl == NULL)
790 {
791 sfree (q);
792 return (ENOMEM);
793 }
795 /* Store context of caller (read plugin); otherwise, it would not be
796 * available to the write plugins when actually dispatching the
797 * value-list later on. */
798 q->ctx = plugin_get_ctx ();
800 pthread_mutex_lock (&write_lock);
802 if (write_queue_tail == NULL)
803 {
804 write_queue_head = q;
805 write_queue_tail = q;
806 write_queue_length = 1;
807 }
808 else
809 {
810 write_queue_tail->next = q;
811 write_queue_tail = q;
812 write_queue_length += 1;
813 }
815 pthread_cond_signal (&write_cond);
816 pthread_mutex_unlock (&write_lock);
818 return (0);
819 } /* }}} int plugin_write_enqueue */
821 static value_list_t *plugin_write_dequeue (void) /* {{{ */
822 {
823 write_queue_t *q;
824 value_list_t *vl;
826 pthread_mutex_lock (&write_lock);
828 while (write_loop && (write_queue_head == NULL))
829 pthread_cond_wait (&write_cond, &write_lock);
831 if (write_queue_head == NULL)
832 {
833 pthread_mutex_unlock (&write_lock);
834 return (NULL);
835 }
837 q = write_queue_head;
838 write_queue_head = q->next;
839 write_queue_length -= 1;
840 if (write_queue_head == NULL) {
841 write_queue_tail = NULL;
842 assert(0 == write_queue_length);
843 }
845 pthread_mutex_unlock (&write_lock);
847 (void) plugin_set_ctx (q->ctx);
849 vl = q->vl;
850 sfree (q);
851 return (vl);
852 } /* }}} value_list_t *plugin_write_dequeue */
854 static void *plugin_write_thread (void __attribute__((unused)) *args) /* {{{ */
855 {
856 while (write_loop)
857 {
858 value_list_t *vl = plugin_write_dequeue ();
859 if (vl == NULL)
860 continue;
862 plugin_dispatch_values_internal (vl);
864 plugin_value_list_free (vl);
865 }
867 pthread_exit (NULL);
868 return ((void *) 0);
869 } /* }}} void *plugin_write_thread */
871 static void start_write_threads (size_t num) /* {{{ */
872 {
873 size_t i;
875 if (write_threads != NULL)
876 return;
878 write_threads = (pthread_t *) calloc (num, sizeof (pthread_t));
879 if (write_threads == NULL)
880 {
881 ERROR ("plugin: start_write_threads: calloc failed.");
882 return;
883 }
885 write_threads_num = 0;
886 for (i = 0; i < num; i++)
887 {
888 int status;
890 status = pthread_create (write_threads + write_threads_num,
891 /* attr = */ NULL,
892 plugin_write_thread,
893 /* arg = */ NULL);
894 if (status != 0)
895 {
896 char errbuf[1024];
897 ERROR ("plugin: start_write_threads: pthread_create failed "
898 "with status %i (%s).", status,
899 sstrerror (status, errbuf, sizeof (errbuf)));
900 return;
901 }
903 write_threads_num++;
904 } /* for (i) */
905 } /* }}} void start_write_threads */
907 static void stop_write_threads (void) /* {{{ */
908 {
909 write_queue_t *q;
910 size_t i;
912 if (write_threads == NULL)
913 return;
915 INFO ("collectd: Stopping %zu write threads.", write_threads_num);
917 pthread_mutex_lock (&write_lock);
918 write_loop = 0;
919 DEBUG ("plugin: stop_write_threads: Signalling `write_cond'");
920 pthread_cond_broadcast (&write_cond);
921 pthread_mutex_unlock (&write_lock);
923 for (i = 0; i < write_threads_num; i++)
924 {
925 if (pthread_join (write_threads[i], NULL) != 0)
926 {
927 ERROR ("plugin: stop_write_threads: pthread_join failed.");
928 }
929 write_threads[i] = (pthread_t) 0;
930 }
931 sfree (write_threads);
932 write_threads_num = 0;
934 pthread_mutex_lock (&write_lock);
935 i = 0;
936 for (q = write_queue_head; q != NULL; )
937 {
938 write_queue_t *q1 = q;
939 plugin_value_list_free (q->vl);
940 q = q->next;
941 sfree (q1);
942 i++;
943 }
944 write_queue_head = NULL;
945 write_queue_tail = NULL;
946 write_queue_length = 0;
947 pthread_mutex_unlock (&write_lock);
949 if (i > 0)
950 {
951 WARNING ("plugin: %zu value list%s left after shutting down "
952 "the write threads.",
953 i, (i == 1) ? " was" : "s were");
954 }
955 } /* }}} void stop_write_threads */
957 /*
958 * Public functions
959 */
960 void plugin_set_dir (const char *dir)
961 {
962 sfree (plugindir);
964 if (dir == NULL)
965 {
966 plugindir = NULL;
967 return;
968 }
970 plugindir = strdup (dir);
971 if (plugindir == NULL)
972 ERROR ("plugin_set_dir: strdup(\"%s\") failed", dir);
973 }
975 static _Bool plugin_is_loaded (char const *name)
976 {
977 int status;
979 if (plugins_loaded == NULL)
980 plugins_loaded = c_avl_create ((void *) strcasecmp);
981 assert (plugins_loaded != NULL);
983 status = c_avl_get (plugins_loaded, name, /* ret_value = */ NULL);
984 return (status == 0);
985 }
987 static int plugin_mark_loaded (char const *name)
988 {
989 char *name_copy;
990 int status;
992 name_copy = strdup (name);
993 if (name_copy == NULL)
994 return (ENOMEM);
996 status = c_avl_insert (plugins_loaded,
997 /* key = */ name_copy, /* value = */ NULL);
998 return (status);
999 }
1001 static void plugin_free_loaded (void)
1002 {
1003 void *key;
1004 void *value;
1006 if (plugins_loaded == NULL)
1007 return;
1009 while (c_avl_pick (plugins_loaded, &key, &value) == 0)
1010 {
1011 sfree (key);
1012 assert (value == NULL);
1013 }
1015 c_avl_destroy (plugins_loaded);
1016 plugins_loaded = NULL;
1017 }
1019 #define BUFSIZE 512
1020 int plugin_load (char const *plugin_name, uint32_t flags)
1021 {
1022 DIR *dh;
1023 const char *dir;
1024 char filename[BUFSIZE] = "";
1025 char typename[BUFSIZE];
1026 int ret;
1027 struct stat statbuf;
1028 struct dirent *de;
1029 int status;
1031 if (plugin_name == NULL)
1032 return (EINVAL);
1034 /* Check if plugin is already loaded and don't do anything in this
1035 * case. */
1036 if (plugin_is_loaded (plugin_name))
1037 return (0);
1039 dir = plugin_get_dir ();
1040 ret = 1;
1042 /*
1043 * XXX: Magic at work:
1044 *
1045 * Some of the language bindings, for example the Python and Perl
1046 * plugins, need to be able to export symbols to the scripts they run.
1047 * For this to happen, the "Globals" flag needs to be set.
1048 * Unfortunately, this technical detail is hard to explain to the
1049 * average user and she shouldn't have to worry about this, ideally.
1050 * So in order to save everyone's sanity use a different default for a
1051 * handful of special plugins. --octo
1052 */
1053 if ((strcasecmp ("perl", plugin_name) == 0)
1054 || (strcasecmp ("python", plugin_name) == 0))
1055 flags |= PLUGIN_FLAGS_GLOBAL;
1057 /* `cpu' should not match `cpufreq'. To solve this we add `.so' to the
1058 * type when matching the filename */
1059 status = ssnprintf (typename, sizeof (typename), "%s.so", plugin_name);
1060 if ((status < 0) || ((size_t) status >= sizeof (typename)))
1061 {
1062 WARNING ("plugin_load: Filename too long: \"%s.so\"", plugin_name);
1063 return (-1);
1064 }
1066 if ((dh = opendir (dir)) == NULL)
1067 {
1068 char errbuf[1024];
1069 ERROR ("plugin_load: opendir (%s) failed: %s", dir,
1070 sstrerror (errno, errbuf, sizeof (errbuf)));
1071 return (-1);
1072 }
1074 while ((de = readdir (dh)) != NULL)
1075 {
1076 if (strcasecmp (de->d_name, typename))
1077 continue;
1079 status = ssnprintf (filename, sizeof (filename),
1080 "%s/%s", dir, de->d_name);
1081 if ((status < 0) || ((size_t) status >= sizeof (filename)))
1082 {
1083 WARNING ("plugin_load: Filename too long: \"%s/%s\"",
1084 dir, de->d_name);
1085 continue;
1086 }
1088 if (lstat (filename, &statbuf) == -1)
1089 {
1090 char errbuf[1024];
1091 WARNING ("plugin_load: stat (\"%s\") failed: %s",
1092 filename,
1093 sstrerror (errno, errbuf, sizeof (errbuf)));
1094 continue;
1095 }
1096 else if (!S_ISREG (statbuf.st_mode))
1097 {
1098 /* don't follow symlinks */
1099 WARNING ("plugin_load: %s is not a regular file.",
1100 filename);
1101 continue;
1102 }
1104 status = plugin_load_file (filename, flags);
1105 if (status == 0)
1106 {
1107 /* success */
1108 plugin_mark_loaded (plugin_name);
1109 ret = 0;
1110 INFO ("plugin_load: plugin \"%s\" successfully loaded.", plugin_name);
1111 break;
1112 }
1113 else
1114 {
1115 ERROR ("plugin_load: Load plugin \"%s\" failed with "
1116 "status %i.", plugin_name, status);
1117 }
1118 }
1120 closedir (dh);
1122 if (filename[0] == 0)
1123 ERROR ("plugin_load: Could not find plugin \"%s\" in %s",
1124 plugin_name, dir);
1126 return (ret);
1127 }
1129 /*
1130 * The `register_*' functions follow
1131 */
1132 int plugin_register_config (const char *name,
1133 int (*callback) (const char *key, const char *val),
1134 const char **keys, int keys_num)
1135 {
1136 cf_register (name, callback, keys, keys_num);
1137 return (0);
1138 } /* int plugin_register_config */
1140 int plugin_register_complex_config (const char *type,
1141 int (*callback) (oconfig_item_t *))
1142 {
1143 return (cf_register_complex (type, callback));
1144 } /* int plugin_register_complex_config */
1146 int plugin_register_init (const char *name,
1147 int (*callback) (void))
1148 {
1149 return (create_register_callback (&list_init, name, (void *) callback,
1150 /* user_data = */ NULL));
1151 } /* plugin_register_init */
1153 static int plugin_compare_read_func (const void *arg0, const void *arg1)
1154 {
1155 const read_func_t *rf0;
1156 const read_func_t *rf1;
1158 rf0 = arg0;
1159 rf1 = arg1;
1161 if (rf0->rf_next_read < rf1->rf_next_read)
1162 return (-1);
1163 else if (rf0->rf_next_read > rf1->rf_next_read)
1164 return (1);
1165 else
1166 return (0);
1167 } /* int plugin_compare_read_func */
1169 /* Add a read function to both, the heap and a linked list. The linked list if
1170 * used to look-up read functions, especially for the remove function. The heap
1171 * is used to determine which plugin to read next. */
1172 static int plugin_insert_read (read_func_t *rf)
1173 {
1174 int status;
1175 llentry_t *le;
1177 rf->rf_next_read = cdtime ();
1178 rf->rf_effective_interval = rf->rf_interval;
1180 pthread_mutex_lock (&read_lock);
1182 if (read_list == NULL)
1183 {
1184 read_list = llist_create ();
1185 if (read_list == NULL)
1186 {
1187 pthread_mutex_unlock (&read_lock);
1188 ERROR ("plugin_insert_read: read_list failed.");
1189 return (-1);
1190 }
1191 }
1193 if (read_heap == NULL)
1194 {
1195 read_heap = c_heap_create (plugin_compare_read_func);
1196 if (read_heap == NULL)
1197 {
1198 pthread_mutex_unlock (&read_lock);
1199 ERROR ("plugin_insert_read: c_heap_create failed.");
1200 return (-1);
1201 }
1202 }
1204 le = llist_search (read_list, rf->rf_name);
1205 if (le != NULL)
1206 {
1207 pthread_mutex_unlock (&read_lock);
1208 WARNING ("The read function \"%s\" is already registered. "
1209 "Check for duplicate \"LoadPlugin\" lines "
1210 "in your configuration!",
1211 rf->rf_name);
1212 return (EINVAL);
1213 }
1215 le = llentry_create (rf->rf_name, rf);
1216 if (le == NULL)
1217 {
1218 pthread_mutex_unlock (&read_lock);
1219 ERROR ("plugin_insert_read: llentry_create failed.");
1220 return (-1);
1221 }
1223 status = c_heap_insert (read_heap, rf);
1224 if (status != 0)
1225 {
1226 pthread_mutex_unlock (&read_lock);
1227 ERROR ("plugin_insert_read: c_heap_insert failed.");
1228 llentry_destroy (le);
1229 return (-1);
1230 }
1232 /* This does not fail. */
1233 llist_append (read_list, le);
1235 /* Wake up all the read threads. */
1236 pthread_cond_broadcast (&read_cond);
1237 pthread_mutex_unlock (&read_lock);
1238 return (0);
1239 } /* int plugin_insert_read */
1241 int plugin_register_read (const char *name,
1242 int (*callback) (void))
1243 {
1244 read_func_t *rf;
1245 int status;
1247 rf = malloc (sizeof (*rf));
1248 if (rf == NULL)
1249 {
1250 ERROR ("plugin_register_read: malloc failed.");
1251 return (ENOMEM);
1252 }
1254 memset (rf, 0, sizeof (read_func_t));
1255 rf->rf_callback = (void *) callback;
1256 rf->rf_udata.data = NULL;
1257 rf->rf_udata.free_func = NULL;
1258 rf->rf_ctx = plugin_get_ctx ();
1259 rf->rf_group[0] = '\0';
1260 rf->rf_name = strdup (name);
1261 rf->rf_type = RF_SIMPLE;
1262 rf->rf_interval = plugin_get_interval ();
1264 status = plugin_insert_read (rf);
1265 if (status != 0) {
1266 sfree (rf->rf_name);
1267 sfree (rf);
1268 }
1270 return (status);
1271 } /* int plugin_register_read */
1273 int plugin_register_complex_read (const char *group, const char *name,
1274 plugin_read_cb callback,
1275 cdtime_t interval,
1276 user_data_t *user_data)
1277 {
1278 read_func_t *rf;
1279 int status;
1281 rf = malloc (sizeof (*rf));
1282 if (rf == NULL)
1283 {
1284 ERROR ("plugin_register_complex_read: malloc failed.");
1285 return (ENOMEM);
1286 }
1288 memset (rf, 0, sizeof (read_func_t));
1289 rf->rf_callback = (void *) callback;
1290 if (group != NULL)
1291 sstrncpy (rf->rf_group, group, sizeof (rf->rf_group));
1292 else
1293 rf->rf_group[0] = '\0';
1294 rf->rf_name = strdup (name);
1295 rf->rf_type = RF_COMPLEX;
1296 rf->rf_interval = (interval != 0) ? interval : plugin_get_interval ();
1298 /* Set user data */
1299 if (user_data == NULL)
1300 {
1301 rf->rf_udata.data = NULL;
1302 rf->rf_udata.free_func = NULL;
1303 }
1304 else
1305 {
1306 rf->rf_udata = *user_data;
1307 }
1309 rf->rf_ctx = plugin_get_ctx ();
1311 status = plugin_insert_read (rf);
1312 if (status != 0) {
1313 sfree (rf->rf_name);
1314 sfree (rf);
1315 }
1317 return (status);
1318 } /* int plugin_register_complex_read */
1320 int plugin_register_write (const char *name,
1321 plugin_write_cb callback, user_data_t *ud)
1322 {
1323 return (create_register_callback (&list_write, name,
1324 (void *) callback, ud));
1325 } /* int plugin_register_write */
1327 static int plugin_flush_timeout_callback (user_data_t *ud)
1328 {
1329 flush_callback_t *cb = ud->data;
1331 return plugin_flush (cb->name, cb->timeout, /* identifier = */ NULL);
1332 } /* static int plugin_flush_callback */
1334 static void plugin_flush_timeout_callback_free (void *data)
1335 {
1336 flush_callback_t *cb = data;
1338 if (cb == NULL) return;
1340 sfree (cb->name);
1341 sfree (cb);
1342 } /* static void plugin_flush_callback_free */
1344 static char *plugin_flush_callback_name (const char *name)
1345 {
1346 char *flush_prefix = "flush/";
1347 size_t prefix_size;
1348 char *flush_name;
1349 size_t name_size;
1351 prefix_size = strlen(flush_prefix);
1352 name_size = strlen(name);
1354 flush_name = malloc (sizeof(char) * (name_size + prefix_size + 1));
1355 if (flush_name == NULL)
1356 {
1357 ERROR ("plugin_flush_callback_name: malloc failed.");
1358 return (NULL);
1359 }
1361 sstrncpy (flush_name, flush_prefix, prefix_size + 1);
1362 sstrncpy (flush_name + prefix_size, name, name_size + 1);
1364 return flush_name;
1365 } /* static char *plugin_flush_callback_name */
1367 int plugin_register_flush (const char *name,
1368 plugin_flush_cb callback, user_data_t *ud)
1369 {
1370 int status;
1371 plugin_ctx_t ctx = plugin_get_ctx ();
1373 status = create_register_callback (&list_flush, name,
1374 (void *) callback, ud);
1375 if (status != 0)
1376 return status;
1378 if (ctx.flush_interval != 0)
1379 {
1380 char *flush_name;
1381 user_data_t ud;
1382 flush_callback_t *cb;
1384 flush_name = plugin_flush_callback_name (name);
1385 if (flush_name == NULL)
1386 return (-1);
1388 cb = malloc(sizeof(flush_callback_t));
1389 if (cb == NULL)
1390 {
1391 ERROR ("plugin_register_flush: malloc failed.");
1392 sfree (flush_name);
1393 return (-1);
1394 }
1396 cb->name = strdup (name);
1397 if (cb->name == NULL)
1398 {
1399 ERROR ("plugin_register_flush: strdup failed.");
1400 sfree (cb);
1401 sfree (flush_name);
1402 return (-1);
1403 }
1404 cb->timeout = ctx.flush_timeout;
1406 ud.data = cb;
1407 ud.free_func = plugin_flush_timeout_callback_free;
1409 status = plugin_register_complex_read (
1410 /* group = */ "flush",
1411 /* name = */ flush_name,
1412 /* callback = */ plugin_flush_timeout_callback,
1413 /* interval = */ ctx.flush_interval,
1414 /* user data = */ &ud);
1416 sfree (flush_name);
1417 if (status != 0)
1418 {
1419 sfree (cb->name);
1420 sfree (cb);
1421 return status;
1422 }
1423 }
1425 return 0;
1426 } /* int plugin_register_flush */
1428 int plugin_register_missing (const char *name,
1429 plugin_missing_cb callback, user_data_t *ud)
1430 {
1431 return (create_register_callback (&list_missing, name,
1432 (void *) callback, ud));
1433 } /* int plugin_register_missing */
1435 int plugin_register_shutdown (const char *name,
1436 int (*callback) (void))
1437 {
1438 return (create_register_callback (&list_shutdown, name,
1439 (void *) callback, /* user_data = */ NULL));
1440 } /* int plugin_register_shutdown */
1442 static void plugin_free_data_sets (void)
1443 {
1444 void *key;
1445 void *value;
1447 if (data_sets == NULL)
1448 return;
1450 while (c_avl_pick (data_sets, &key, &value) == 0)
1451 {
1452 data_set_t *ds = value;
1453 /* key is a pointer to ds->type */
1455 sfree (ds->ds);
1456 sfree (ds);
1457 }
1459 c_avl_destroy (data_sets);
1460 data_sets = NULL;
1461 } /* void plugin_free_data_sets */
1463 int plugin_register_data_set (const data_set_t *ds)
1464 {
1465 data_set_t *ds_copy;
1466 size_t i;
1468 if ((data_sets != NULL)
1469 && (c_avl_get (data_sets, ds->type, NULL) == 0))
1470 {
1471 NOTICE ("Replacing DS `%s' with another version.", ds->type);
1472 plugin_unregister_data_set (ds->type);
1473 }
1474 else if (data_sets == NULL)
1475 {
1476 data_sets = c_avl_create ((int (*) (const void *, const void *)) strcmp);
1477 if (data_sets == NULL)
1478 return (-1);
1479 }
1481 ds_copy = (data_set_t *) malloc (sizeof (data_set_t));
1482 if (ds_copy == NULL)
1483 return (-1);
1484 memcpy(ds_copy, ds, sizeof (data_set_t));
1486 ds_copy->ds = (data_source_t *) malloc (sizeof (data_source_t)
1487 * ds->ds_num);
1488 if (ds_copy->ds == NULL)
1489 {
1490 sfree (ds_copy);
1491 return (-1);
1492 }
1494 for (i = 0; i < ds->ds_num; i++)
1495 memcpy (ds_copy->ds + i, ds->ds + i, sizeof (data_source_t));
1497 return (c_avl_insert (data_sets, (void *) ds_copy->type, (void *) ds_copy));
1498 } /* int plugin_register_data_set */
1500 int plugin_register_log (const char *name,
1501 plugin_log_cb callback, user_data_t *ud)
1502 {
1503 return (create_register_callback (&list_log, name,
1504 (void *) callback, ud));
1505 } /* int plugin_register_log */
1507 int plugin_register_notification (const char *name,
1508 plugin_notification_cb callback, user_data_t *ud)
1509 {
1510 return (create_register_callback (&list_notification, name,
1511 (void *) callback, ud));
1512 } /* int plugin_register_log */
1514 int plugin_unregister_config (const char *name)
1515 {
1516 cf_unregister (name);
1517 return (0);
1518 } /* int plugin_unregister_config */
1520 int plugin_unregister_complex_config (const char *name)
1521 {
1522 cf_unregister_complex (name);
1523 return (0);
1524 } /* int plugin_unregister_complex_config */
1526 int plugin_unregister_init (const char *name)
1527 {
1528 return (plugin_unregister (list_init, name));
1529 }
1531 int plugin_unregister_read (const char *name) /* {{{ */
1532 {
1533 llentry_t *le;
1534 read_func_t *rf;
1536 if (name == NULL)
1537 return (-ENOENT);
1539 pthread_mutex_lock (&read_lock);
1541 if (read_list == NULL)
1542 {
1543 pthread_mutex_unlock (&read_lock);
1544 return (-ENOENT);
1545 }
1547 le = llist_search (read_list, name);
1548 if (le == NULL)
1549 {
1550 pthread_mutex_unlock (&read_lock);
1551 WARNING ("plugin_unregister_read: No such read function: %s",
1552 name);
1553 return (-ENOENT);
1554 }
1556 llist_remove (read_list, le);
1558 rf = le->value;
1559 assert (rf != NULL);
1560 rf->rf_type = RF_REMOVE;
1562 pthread_mutex_unlock (&read_lock);
1564 llentry_destroy (le);
1566 DEBUG ("plugin_unregister_read: Marked `%s' for removal.", name);
1568 return (0);
1569 } /* }}} int plugin_unregister_read */
1571 void plugin_log_available_writers (void)
1572 {
1573 log_list_callbacks (&list_write, "Available write targets:");
1574 }
1576 static int compare_read_func_group (llentry_t *e, void *ud) /* {{{ */
1577 {
1578 read_func_t *rf = e->value;
1579 char *group = ud;
1581 return strcmp (rf->rf_group, (const char *)group);
1582 } /* }}} int compare_read_func_group */
1584 int plugin_unregister_read_group (const char *group) /* {{{ */
1585 {
1586 llentry_t *le;
1587 read_func_t *rf;
1589 int found = 0;
1591 if (group == NULL)
1592 return (-ENOENT);
1594 pthread_mutex_lock (&read_lock);
1596 if (read_list == NULL)
1597 {
1598 pthread_mutex_unlock (&read_lock);
1599 return (-ENOENT);
1600 }
1602 while (42)
1603 {
1604 le = llist_search_custom (read_list,
1605 compare_read_func_group, (void *)group);
1607 if (le == NULL)
1608 break;
1610 ++found;
1612 llist_remove (read_list, le);
1614 rf = le->value;
1615 assert (rf != NULL);
1616 rf->rf_type = RF_REMOVE;
1618 llentry_destroy (le);
1620 DEBUG ("plugin_unregister_read_group: "
1621 "Marked `%s' (group `%s') for removal.",
1622 rf->rf_name, group);
1623 }
1625 pthread_mutex_unlock (&read_lock);
1627 if (found == 0)
1628 {
1629 WARNING ("plugin_unregister_read_group: No such "
1630 "group of read function: %s", group);
1631 return (-ENOENT);
1632 }
1634 return (0);
1635 } /* }}} int plugin_unregister_read_group */
1637 int plugin_unregister_write (const char *name)
1638 {
1639 return (plugin_unregister (list_write, name));
1640 }
1642 int plugin_unregister_flush (const char *name)
1643 {
1644 plugin_ctx_t ctx = plugin_get_ctx ();
1646 if (ctx.flush_interval != 0)
1647 {
1648 char *flush_name;
1650 flush_name = plugin_flush_callback_name (name);
1651 if (flush_name != NULL)
1652 {
1653 plugin_unregister_read(flush_name);
1654 sfree (flush_name);
1655 }
1656 }
1658 return plugin_unregister (list_flush, name);
1659 }
1661 int plugin_unregister_missing (const char *name)
1662 {
1663 return (plugin_unregister (list_missing, name));
1664 }
1666 int plugin_unregister_shutdown (const char *name)
1667 {
1668 return (plugin_unregister (list_shutdown, name));
1669 }
1671 int plugin_unregister_data_set (const char *name)
1672 {
1673 data_set_t *ds;
1675 if (data_sets == NULL)
1676 return (-1);
1678 if (c_avl_remove (data_sets, name, NULL, (void *) &ds) != 0)
1679 return (-1);
1681 sfree (ds->ds);
1682 sfree (ds);
1684 return (0);
1685 } /* int plugin_unregister_data_set */
1687 int plugin_unregister_log (const char *name)
1688 {
1689 return (plugin_unregister (list_log, name));
1690 }
1692 int plugin_unregister_notification (const char *name)
1693 {
1694 return (plugin_unregister (list_notification, name));
1695 }
1697 void plugin_init_all (void)
1698 {
1699 char const *chain_name;
1700 llentry_t *le;
1701 int status;
1703 /* Init the value cache */
1704 uc_init ();
1706 if (IS_TRUE (global_option_get ("CollectInternalStats")))
1707 record_statistics = 1;
1709 chain_name = global_option_get ("PreCacheChain");
1710 pre_cache_chain = fc_chain_get_by_name (chain_name);
1712 chain_name = global_option_get ("PostCacheChain");
1713 post_cache_chain = fc_chain_get_by_name (chain_name);
1715 write_limit_high = global_option_get_long ("WriteQueueLimitHigh",
1716 /* default = */ 0);
1717 if (write_limit_high < 0)
1718 {
1719 ERROR ("WriteQueueLimitHigh must be positive or zero.");
1720 write_limit_high = 0;
1721 }
1723 write_limit_low = global_option_get_long ("WriteQueueLimitLow",
1724 /* default = */ write_limit_high / 2);
1725 if (write_limit_low < 0)
1726 {
1727 ERROR ("WriteQueueLimitLow must be positive or zero.");
1728 write_limit_low = write_limit_high / 2;
1729 }
1730 else if (write_limit_low > write_limit_high)
1731 {
1732 ERROR ("WriteQueueLimitLow must not be larger than "
1733 "WriteQueueLimitHigh.");
1734 write_limit_low = write_limit_high;
1735 }
1737 write_threads_num = global_option_get_long ("WriteThreads",
1738 /* default = */ 5);
1739 if (write_threads_num < 1)
1740 {
1741 ERROR ("WriteThreads must be positive.");
1742 write_threads_num = 5;
1743 }
1745 if ((list_init == NULL) && (read_heap == NULL))
1746 return;
1748 /* Calling all init callbacks before checking if read callbacks
1749 * are available allows the init callbacks to register the read
1750 * callback. */
1751 le = llist_head (list_init);
1752 while (le != NULL)
1753 {
1754 callback_func_t *cf;
1755 plugin_init_cb callback;
1756 plugin_ctx_t old_ctx;
1758 cf = le->value;
1759 old_ctx = plugin_set_ctx (cf->cf_ctx);
1760 callback = cf->cf_callback;
1761 status = (*callback) ();
1762 plugin_set_ctx (old_ctx);
1764 if (status != 0)
1765 {
1766 ERROR ("Initialization of plugin `%s' "
1767 "failed with status %i. "
1768 "Plugin will be unloaded.",
1769 le->key, status);
1770 /* Plugins that register read callbacks from the init
1771 * callback should take care of appropriate error
1772 * handling themselves. */
1773 /* FIXME: Unload _all_ functions */
1774 plugin_unregister_read (le->key);
1775 }
1777 le = le->next;
1778 }
1780 start_write_threads ((size_t) write_threads_num);
1782 max_read_interval = global_option_get_time ("MaxReadInterval",
1783 DEFAULT_MAX_READ_INTERVAL);
1785 /* Start read-threads */
1786 if (read_heap != NULL)
1787 {
1788 const char *rt;
1789 int num;
1791 rt = global_option_get ("ReadThreads");
1792 num = atoi (rt);
1793 if (num != -1)
1794 start_read_threads ((num > 0) ? num : 5);
1795 }
1796 } /* void plugin_init_all */
1798 /* TODO: Rename this function. */
1799 void plugin_read_all (void)
1800 {
1801 if(record_statistics) {
1802 plugin_update_internal_statistics ();
1803 }
1804 uc_check_timeout ();
1806 return;
1807 } /* void plugin_read_all */
1809 /* Read function called when the `-T' command line argument is given. */
1810 int plugin_read_all_once (void)
1811 {
1812 int status;
1813 int return_status = 0;
1815 if (read_heap == NULL)
1816 {
1817 NOTICE ("No read-functions are registered.");
1818 return (0);
1819 }
1821 while (42)
1822 {
1823 read_func_t *rf;
1824 plugin_ctx_t old_ctx;
1826 rf = c_heap_get_root (read_heap);
1827 if (rf == NULL)
1828 break;
1830 old_ctx = plugin_set_ctx (rf->rf_ctx);
1832 if (rf->rf_type == RF_SIMPLE)
1833 {
1834 int (*callback) (void);
1836 callback = rf->rf_callback;
1837 status = (*callback) ();
1838 }
1839 else
1840 {
1841 plugin_read_cb callback;
1843 callback = rf->rf_callback;
1844 status = (*callback) (&rf->rf_udata);
1845 }
1847 plugin_set_ctx (old_ctx);
1849 if (status != 0)
1850 {
1851 NOTICE ("read-function of plugin `%s' failed.",
1852 rf->rf_name);
1853 return_status = -1;
1854 }
1856 sfree (rf->rf_name);
1857 destroy_callback ((void *) rf);
1858 }
1860 return (return_status);
1861 } /* int plugin_read_all_once */
1863 int plugin_write (const char *plugin, /* {{{ */
1864 const data_set_t *ds, const value_list_t *vl)
1865 {
1866 llentry_t *le;
1867 int status;
1869 if (vl == NULL)
1870 return (EINVAL);
1872 if (list_write == NULL)
1873 return (ENOENT);
1875 if (ds == NULL)
1876 {
1877 ds = plugin_get_ds (vl->type);
1878 if (ds == NULL)
1879 {
1880 ERROR ("plugin_write: Unable to lookup type `%s'.", vl->type);
1881 return (ENOENT);
1882 }
1883 }
1885 if (plugin == NULL)
1886 {
1887 int success = 0;
1888 int failure = 0;
1890 le = llist_head (list_write);
1891 while (le != NULL)
1892 {
1893 callback_func_t *cf = le->value;
1894 plugin_write_cb callback;
1896 /* do not switch plugin context; rather keep the context (interval)
1897 * information of the calling read plugin */
1899 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1900 callback = cf->cf_callback;
1901 status = (*callback) (ds, vl, &cf->cf_udata);
1902 if (status != 0)
1903 failure++;
1904 else
1905 success++;
1907 le = le->next;
1908 }
1910 if ((success == 0) && (failure != 0))
1911 status = -1;
1912 else
1913 status = 0;
1914 }
1915 else /* plugin != NULL */
1916 {
1917 callback_func_t *cf;
1918 plugin_write_cb callback;
1920 le = llist_head (list_write);
1921 while (le != NULL)
1922 {
1923 if (strcasecmp (plugin, le->key) == 0)
1924 break;
1926 le = le->next;
1927 }
1929 if (le == NULL)
1930 return (ENOENT);
1932 cf = le->value;
1934 /* do not switch plugin context; rather keep the context (interval)
1935 * information of the calling read plugin */
1937 DEBUG ("plugin: plugin_write: Writing values via %s.", le->key);
1938 callback = cf->cf_callback;
1939 status = (*callback) (ds, vl, &cf->cf_udata);
1940 }
1942 return (status);
1943 } /* }}} int plugin_write */
1945 int plugin_flush (const char *plugin, cdtime_t timeout, const char *identifier)
1946 {
1947 llentry_t *le;
1949 if (list_flush == NULL)
1950 return (0);
1952 le = llist_head (list_flush);
1953 while (le != NULL)
1954 {
1955 callback_func_t *cf;
1956 plugin_flush_cb callback;
1957 plugin_ctx_t old_ctx;
1959 if ((plugin != NULL)
1960 && (strcmp (plugin, le->key) != 0))
1961 {
1962 le = le->next;
1963 continue;
1964 }
1966 cf = le->value;
1967 old_ctx = plugin_set_ctx (cf->cf_ctx);
1968 callback = cf->cf_callback;
1970 (*callback) (timeout, identifier, &cf->cf_udata);
1972 plugin_set_ctx (old_ctx);
1974 le = le->next;
1975 }
1976 return (0);
1977 } /* int plugin_flush */
1979 void plugin_shutdown_all (void)
1980 {
1981 llentry_t *le;
1983 stop_read_threads ();
1985 destroy_all_callbacks (&list_init);
1987 pthread_mutex_lock (&read_lock);
1988 llist_destroy (read_list);
1989 read_list = NULL;
1990 pthread_mutex_unlock (&read_lock);
1992 destroy_read_heap ();
1994 plugin_flush (/* plugin = */ NULL,
1995 /* timeout = */ 0,
1996 /* identifier = */ NULL);
1998 le = NULL;
1999 if (list_shutdown != NULL)
2000 le = llist_head (list_shutdown);
2002 while (le != NULL)
2003 {
2004 callback_func_t *cf;
2005 plugin_shutdown_cb callback;
2006 plugin_ctx_t old_ctx;
2008 cf = le->value;
2009 old_ctx = plugin_set_ctx (cf->cf_ctx);
2010 callback = cf->cf_callback;
2012 /* Advance the pointer before calling the callback allows
2013 * shutdown functions to unregister themselves. If done the
2014 * other way around the memory `le' points to will be freed
2015 * after callback returns. */
2016 le = le->next;
2018 (*callback) ();
2020 plugin_set_ctx (old_ctx);
2021 }
2023 stop_write_threads ();
2025 /* Write plugins which use the `user_data' pointer usually need the
2026 * same data available to the flush callback. If this is the case, set
2027 * the free_function to NULL when registering the flush callback and to
2028 * the real free function when registering the write callback. This way
2029 * the data isn't freed twice. */
2030 destroy_all_callbacks (&list_flush);
2031 destroy_all_callbacks (&list_missing);
2032 destroy_all_callbacks (&list_write);
2034 destroy_all_callbacks (&list_notification);
2035 destroy_all_callbacks (&list_shutdown);
2036 destroy_all_callbacks (&list_log);
2038 plugin_free_loaded ();
2039 plugin_free_data_sets ();
2040 } /* void plugin_shutdown_all */
2042 int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */
2043 {
2044 llentry_t *le;
2046 if (list_missing == NULL)
2047 return (0);
2049 le = llist_head (list_missing);
2050 while (le != NULL)
2051 {
2052 callback_func_t *cf;
2053 plugin_missing_cb callback;
2054 plugin_ctx_t old_ctx;
2055 int status;
2057 cf = le->value;
2058 old_ctx = plugin_set_ctx (cf->cf_ctx);
2059 callback = cf->cf_callback;
2061 status = (*callback) (vl, &cf->cf_udata);
2062 plugin_set_ctx (old_ctx);
2063 if (status != 0)
2064 {
2065 if (status < 0)
2066 {
2067 ERROR ("plugin_dispatch_missing: Callback function \"%s\" "
2068 "failed with status %i.",
2069 le->key, status);
2070 return (status);
2071 }
2072 else
2073 {
2074 return (0);
2075 }
2076 }
2078 le = le->next;
2079 }
2080 return (0);
2081 } /* int }}} plugin_dispatch_missing */
2083 static int plugin_dispatch_values_internal (value_list_t *vl)
2084 {
2085 int status;
2086 static c_complain_t no_write_complaint = C_COMPLAIN_INIT_STATIC;
2088 value_t *saved_values;
2089 int saved_values_len;
2091 data_set_t *ds;
2093 int free_meta_data = 0;
2095 if ((vl == NULL) || (vl->type[0] == 0)
2096 || (vl->values == NULL) || (vl->values_len < 1))
2097 {
2098 ERROR ("plugin_dispatch_values: Invalid value list "
2099 "from plugin %s.", vl->plugin);
2100 return (-1);
2101 }
2103 /* Free meta data only if the calling function didn't specify any. In
2104 * this case matches and targets may add some and the calling function
2105 * may not expect (and therefore free) that data. */
2106 if (vl->meta == NULL)
2107 free_meta_data = 1;
2109 if (list_write == NULL)
2110 c_complain_once (LOG_WARNING, &no_write_complaint,
2111 "plugin_dispatch_values: No write callback has been "
2112 "registered. Please load at least one output plugin, "
2113 "if you want the collected data to be stored.");
2115 if (data_sets == NULL)
2116 {
2117 ERROR ("plugin_dispatch_values: No data sets registered. "
2118 "Could the types database be read? Check "
2119 "your `TypesDB' setting!");
2120 return (-1);
2121 }
2123 if (c_avl_get (data_sets, vl->type, (void *) &ds) != 0)
2124 {
2125 char ident[6 * DATA_MAX_NAME_LEN];
2127 FORMAT_VL (ident, sizeof (ident), vl);
2128 INFO ("plugin_dispatch_values: Dataset not found: %s "
2129 "(from \"%s\"), check your types.db!",
2130 vl->type, ident);
2131 return (-1);
2132 }
2134 /* Assured by plugin_value_list_clone(). The time is determined at
2135 * _enqueue_ time. */
2136 assert (vl->time != 0);
2137 assert (vl->interval != 0);
2139 DEBUG ("plugin_dispatch_values: time = %.3f; interval = %.3f; "
2140 "host = %s; "
2141 "plugin = %s; plugin_instance = %s; "
2142 "type = %s; type_instance = %s;",
2143 CDTIME_T_TO_DOUBLE (vl->time),
2144 CDTIME_T_TO_DOUBLE (vl->interval),
2145 vl->host,
2146 vl->plugin, vl->plugin_instance,
2147 vl->type, vl->type_instance);
2149 #if COLLECT_DEBUG
2150 assert (0 == strcmp (ds->type, vl->type));
2151 #else
2152 if (0 != strcmp (ds->type, vl->type))
2153 WARNING ("plugin_dispatch_values: (ds->type = %s) != (vl->type = %s)",
2154 ds->type, vl->type);
2155 #endif
2157 #if COLLECT_DEBUG
2158 assert (ds->ds_num == vl->values_len);
2159 #else
2160 if (ds->ds_num != vl->values_len)
2161 {
2162 ERROR ("plugin_dispatch_values: ds->type = %s: "
2163 "(ds->ds_num = %zu) != "
2164 "(vl->values_len = %zu)",
2165 ds->type, ds->ds_num, vl->values_len);
2166 return (-1);
2167 }
2168 #endif
2170 escape_slashes (vl->host, sizeof (vl->host));
2171 escape_slashes (vl->plugin, sizeof (vl->plugin));
2172 escape_slashes (vl->plugin_instance, sizeof (vl->plugin_instance));
2173 escape_slashes (vl->type, sizeof (vl->type));
2174 escape_slashes (vl->type_instance, sizeof (vl->type_instance));
2176 /* Copy the values. This way, we can assure `targets' that they get
2177 * dynamically allocated values, which they can free and replace if
2178 * they like. */
2179 if ((pre_cache_chain != NULL) || (post_cache_chain != NULL))
2180 {
2181 saved_values = vl->values;
2182 saved_values_len = vl->values_len;
2184 vl->values = (value_t *) calloc (vl->values_len,
2185 sizeof (*vl->values));
2186 if (vl->values == NULL)
2187 {
2188 ERROR ("plugin_dispatch_values: calloc failed.");
2189 vl->values = saved_values;
2190 return (-1);
2191 }
2192 memcpy (vl->values, saved_values,
2193 vl->values_len * sizeof (*vl->values));
2194 }
2195 else /* if ((pre == NULL) && (post == NULL)) */
2196 {
2197 saved_values = NULL;
2198 saved_values_len = 0;
2199 }
2201 if (pre_cache_chain != NULL)
2202 {
2203 status = fc_process_chain (ds, vl, pre_cache_chain);
2204 if (status < 0)
2205 {
2206 WARNING ("plugin_dispatch_values: Running the "
2207 "pre-cache chain failed with "
2208 "status %i (%#x).",
2209 status, status);
2210 }
2211 else if (status == FC_TARGET_STOP)
2212 {
2213 /* Restore the state of the value_list so that plugins
2214 * don't get confused.. */
2215 if (saved_values != NULL)
2216 {
2217 sfree (vl->values);
2218 vl->values = saved_values;
2219 vl->values_len = saved_values_len;
2220 }
2221 return (0);
2222 }
2223 }
2225 /* Update the value cache */
2226 uc_update (ds, vl);
2228 if (post_cache_chain != NULL)
2229 {
2230 status = fc_process_chain (ds, vl, post_cache_chain);
2231 if (status < 0)
2232 {
2233 WARNING ("plugin_dispatch_values: Running the "
2234 "post-cache chain failed with "
2235 "status %i (%#x).",
2236 status, status);
2237 }
2238 }
2239 else
2240 fc_default_action (ds, vl);
2242 /* Restore the state of the value_list so that plugins don't get
2243 * confused.. */
2244 if (saved_values != NULL)
2245 {
2246 sfree (vl->values);
2247 vl->values = saved_values;
2248 vl->values_len = saved_values_len;
2249 }
2251 if ((free_meta_data != 0) && (vl->meta != NULL))
2252 {
2253 meta_data_destroy (vl->meta);
2254 vl->meta = NULL;
2255 }
2257 return (0);
2258 } /* int plugin_dispatch_values_internal */
2260 static double get_drop_probability (void) /* {{{ */
2261 {
2262 long pos;
2263 long size;
2264 long wql;
2266 pthread_mutex_lock (&write_lock);
2267 wql = write_queue_length;
2268 pthread_mutex_unlock (&write_lock);
2270 if (wql < write_limit_low)
2271 return (0.0);
2272 if (wql >= write_limit_high)
2273 return (1.0);
2275 pos = 1 + wql - write_limit_low;
2276 size = 1 + write_limit_high - write_limit_low;
2278 return (((double) pos) / ((double) size));
2279 } /* }}} double get_drop_probability */
2281 static _Bool check_drop_value (void) /* {{{ */
2282 {
2283 static cdtime_t last_message_time = 0;
2284 static pthread_mutex_t last_message_lock = PTHREAD_MUTEX_INITIALIZER;
2286 double p;
2287 double q;
2288 int status;
2290 if (write_limit_high == 0)
2291 return (0);
2293 p = get_drop_probability ();
2294 if (p == 0.0)
2295 return (0);
2297 status = pthread_mutex_trylock (&last_message_lock);
2298 if (status == 0)
2299 {
2300 cdtime_t now;
2302 now = cdtime ();
2303 if ((now - last_message_time) > TIME_T_TO_CDTIME_T (1))
2304 {
2305 last_message_time = now;
2306 ERROR ("plugin_dispatch_values: Low water mark "
2307 "reached. Dropping %.0f%% of metrics.",
2308 100.0 * p);
2309 }
2310 pthread_mutex_unlock (&last_message_lock);
2311 }
2313 if (p == 1.0)
2314 return (1);
2316 q = cdrand_d ();
2317 if (q > p)
2318 return (1);
2319 else
2320 return (0);
2321 } /* }}} _Bool check_drop_value */
2323 int plugin_dispatch_values (value_list_t const *vl)
2324 {
2325 int status;
2326 static pthread_mutex_t statistics_lock = PTHREAD_MUTEX_INITIALIZER;
2328 if (check_drop_value ()) {
2329 if(record_statistics) {
2330 pthread_mutex_lock(&statistics_lock);
2331 stats_values_dropped++;
2332 pthread_mutex_unlock(&statistics_lock);
2333 }
2334 return (0);
2335 }
2337 status = plugin_write_enqueue (vl);
2338 if (status != 0)
2339 {
2340 char errbuf[1024];
2341 ERROR ("plugin_dispatch_values: plugin_write_enqueue failed "
2342 "with status %i (%s).", status,
2343 sstrerror (status, errbuf, sizeof (errbuf)));
2344 return (status);
2345 }
2347 return (0);
2348 }
2350 __attribute__((sentinel))
2351 int plugin_dispatch_multivalue (value_list_t const *template, /* {{{ */
2352 _Bool store_percentage, int store_type, ...)
2353 {
2354 value_list_t *vl;
2355 int failed = 0;
2356 gauge_t sum = 0.0;
2357 va_list ap;
2359 assert (template->values_len == 1);
2361 /* Calculate sum for Gauge to calculate percent if needed */
2362 if (DS_TYPE_GAUGE == store_type) {
2363 va_start (ap, store_type);
2364 while (42)
2365 {
2366 char const *name;
2367 gauge_t value;
2369 name = va_arg (ap, char const *);
2370 if (name == NULL)
2371 break;
2373 value = va_arg (ap, gauge_t);
2374 if (!isnan (value))
2375 sum += value;
2376 }
2377 va_end (ap);
2378 }
2381 vl = plugin_value_list_clone (template);
2382 /* plugin_value_list_clone makes sure vl->time is set to non-zero. */
2383 if (store_percentage)
2384 sstrncpy (vl->type, "percent", sizeof (vl->type));
2386 va_start (ap, store_type);
2387 while (42)
2388 {
2389 char const *name;
2390 int status;
2392 /* Set the type instance. */
2393 name = va_arg (ap, char const *);
2394 if (name == NULL)
2395 break;
2396 sstrncpy (vl->type_instance, name, sizeof (vl->type_instance));
2398 /* Set the value. */
2399 switch (store_type)
2400 {
2401 case DS_TYPE_GAUGE:
2402 vl->values[0].gauge = va_arg (ap, gauge_t);
2403 if (store_percentage)
2404 vl->values[0].gauge *= sum ? (100.0 / sum) : 0;
2405 break;
2406 case DS_TYPE_ABSOLUTE:
2407 vl->values[0].absolute = va_arg (ap, absolute_t);
2408 break;
2409 case DS_TYPE_COUNTER:
2410 vl->values[0].counter = va_arg (ap, counter_t);
2411 break;
2412 case DS_TYPE_DERIVE:
2413 vl->values[0].derive = va_arg (ap, derive_t);
2414 break;
2415 default:
2416 ERROR ("plugin_dispatch_multivalue: given store_type is incorrect.");
2417 failed++;
2418 }
2421 status = plugin_write_enqueue (vl);
2422 if (status != 0)
2423 failed++;
2424 }
2425 va_end (ap);
2427 plugin_value_list_free (vl);
2428 return (failed);
2429 } /* }}} int plugin_dispatch_multivalue */
2431 int plugin_dispatch_notification (const notification_t *notif)
2432 {
2433 llentry_t *le;
2434 /* Possible TODO: Add flap detection here */
2436 DEBUG ("plugin_dispatch_notification: severity = %i; message = %s; "
2437 "time = %.3f; host = %s;",
2438 notif->severity, notif->message,
2439 CDTIME_T_TO_DOUBLE (notif->time), notif->host);
2441 /* Nobody cares for notifications */
2442 if (list_notification == NULL)
2443 return (-1);
2445 le = llist_head (list_notification);
2446 while (le != NULL)
2447 {
2448 callback_func_t *cf;
2449 plugin_notification_cb callback;
2450 int status;
2452 /* do not switch plugin context; rather keep the context
2453 * (interval) information of the calling plugin */
2455 cf = le->value;
2456 callback = cf->cf_callback;
2457 status = (*callback) (notif, &cf->cf_udata);
2458 if (status != 0)
2459 {
2460 WARNING ("plugin_dispatch_notification: Notification "
2461 "callback %s returned %i.",
2462 le->key, status);
2463 }
2465 le = le->next;
2466 }
2468 return (0);
2469 } /* int plugin_dispatch_notification */
2471 void plugin_log (int level, const char *format, ...)
2472 {
2473 char msg[1024];
2474 va_list ap;
2475 llentry_t *le;
2477 #if !COLLECT_DEBUG
2478 if (level >= LOG_DEBUG)
2479 return;
2480 #endif
2482 va_start (ap, format);
2483 vsnprintf (msg, sizeof (msg), format, ap);
2484 msg[sizeof (msg) - 1] = '\0';
2485 va_end (ap);
2487 if (list_log == NULL)
2488 {
2489 fprintf (stderr, "%s\n", msg);
2490 return;
2491 }
2493 le = llist_head (list_log);
2494 while (le != NULL)
2495 {
2496 callback_func_t *cf;
2497 plugin_log_cb callback;
2499 cf = le->value;
2500 callback = cf->cf_callback;
2502 /* do not switch plugin context; rather keep the context
2503 * (interval) information of the calling plugin */
2505 (*callback) (level, msg, &cf->cf_udata);
2507 le = le->next;
2508 }
2509 } /* void plugin_log */
2511 int parse_log_severity (const char *severity)
2512 {
2513 int log_level = -1;
2515 if ((0 == strcasecmp (severity, "emerg"))
2516 || (0 == strcasecmp (severity, "alert"))
2517 || (0 == strcasecmp (severity, "crit"))
2518 || (0 == strcasecmp (severity, "err")))
2519 log_level = LOG_ERR;
2520 else if (0 == strcasecmp (severity, "warning"))
2521 log_level = LOG_WARNING;
2522 else if (0 == strcasecmp (severity, "notice"))
2523 log_level = LOG_NOTICE;
2524 else if (0 == strcasecmp (severity, "info"))
2525 log_level = LOG_INFO;
2526 #if COLLECT_DEBUG
2527 else if (0 == strcasecmp (severity, "debug"))
2528 log_level = LOG_DEBUG;
2529 #endif /* COLLECT_DEBUG */
2531 return (log_level);
2532 } /* int parse_log_severity */
2534 int parse_notif_severity (const char *severity)
2535 {
2536 int notif_severity = -1;
2538 if (strcasecmp (severity, "FAILURE") == 0)
2539 notif_severity = NOTIF_FAILURE;
2540 else if (strcmp (severity, "OKAY") == 0)
2541 notif_severity = NOTIF_OKAY;
2542 else if ((strcmp (severity, "WARNING") == 0)
2543 || (strcmp (severity, "WARN") == 0))
2544 notif_severity = NOTIF_WARNING;
2546 return (notif_severity);
2547 } /* int parse_notif_severity */
2549 const data_set_t *plugin_get_ds (const char *name)
2550 {
2551 data_set_t *ds;
2553 if (data_sets == NULL)
2554 {
2555 ERROR ("plugin_get_ds: No data sets are defined yet.");
2556 return (NULL);
2557 }
2559 if (c_avl_get (data_sets, name, (void *) &ds) != 0)
2560 {
2561 DEBUG ("No such dataset registered: %s", name);
2562 return (NULL);
2563 }
2565 return (ds);
2566 } /* data_set_t *plugin_get_ds */
2568 static int plugin_notification_meta_add (notification_t *n,
2569 const char *name,
2570 enum notification_meta_type_e type,
2571 const void *value)
2572 {
2573 notification_meta_t *meta;
2574 notification_meta_t *tail;
2576 if ((n == NULL) || (name == NULL) || (value == NULL))
2577 {
2578 ERROR ("plugin_notification_meta_add: A pointer is NULL!");
2579 return (-1);
2580 }
2582 meta = (notification_meta_t *) malloc (sizeof (notification_meta_t));
2583 if (meta == NULL)
2584 {
2585 ERROR ("plugin_notification_meta_add: malloc failed.");
2586 return (-1);
2587 }
2588 memset (meta, 0, sizeof (notification_meta_t));
2590 sstrncpy (meta->name, name, sizeof (meta->name));
2591 meta->type = type;
2593 switch (type)
2594 {
2595 case NM_TYPE_STRING:
2596 {
2597 meta->nm_value.nm_string = strdup ((const char *) value);
2598 if (meta->nm_value.nm_string == NULL)
2599 {
2600 ERROR ("plugin_notification_meta_add: strdup failed.");
2601 sfree (meta);
2602 return (-1);
2603 }
2604 break;
2605 }
2606 case NM_TYPE_SIGNED_INT:
2607 {
2608 meta->nm_value.nm_signed_int = *((int64_t *) value);
2609 break;
2610 }
2611 case NM_TYPE_UNSIGNED_INT:
2612 {
2613 meta->nm_value.nm_unsigned_int = *((uint64_t *) value);
2614 break;
2615 }
2616 case NM_TYPE_DOUBLE:
2617 {
2618 meta->nm_value.nm_double = *((double *) value);
2619 break;
2620 }
2621 case NM_TYPE_BOOLEAN:
2622 {
2623 meta->nm_value.nm_boolean = *((_Bool *) value);
2624 break;
2625 }
2626 default:
2627 {
2628 ERROR ("plugin_notification_meta_add: Unknown type: %i", type);
2629 sfree (meta);
2630 return (-1);
2631 }
2632 } /* switch (type) */
2634 meta->next = NULL;
2635 tail = n->meta;
2636 while ((tail != NULL) && (tail->next != NULL))
2637 tail = tail->next;
2639 if (tail == NULL)
2640 n->meta = meta;
2641 else
2642 tail->next = meta;
2644 return (0);
2645 } /* int plugin_notification_meta_add */
2647 int plugin_notification_meta_add_string (notification_t *n,
2648 const char *name,
2649 const char *value)
2650 {
2651 return (plugin_notification_meta_add (n, name, NM_TYPE_STRING, value));
2652 }
2654 int plugin_notification_meta_add_signed_int (notification_t *n,
2655 const char *name,
2656 int64_t value)
2657 {
2658 return (plugin_notification_meta_add (n, name, NM_TYPE_SIGNED_INT, &value));
2659 }
2661 int plugin_notification_meta_add_unsigned_int (notification_t *n,
2662 const char *name,
2663 uint64_t value)
2664 {
2665 return (plugin_notification_meta_add (n, name, NM_TYPE_UNSIGNED_INT, &value));
2666 }
2668 int plugin_notification_meta_add_double (notification_t *n,
2669 const char *name,
2670 double value)
2671 {
2672 return (plugin_notification_meta_add (n, name, NM_TYPE_DOUBLE, &value));
2673 }
2675 int plugin_notification_meta_add_boolean (notification_t *n,
2676 const char *name,
2677 _Bool value)
2678 {
2679 return (plugin_notification_meta_add (n, name, NM_TYPE_BOOLEAN, &value));
2680 }
2682 int plugin_notification_meta_copy (notification_t *dst,
2683 const notification_t *src)
2684 {
2685 notification_meta_t *meta;
2687 assert (dst != NULL);
2688 assert (src != NULL);
2689 assert (dst != src);
2690 assert ((src->meta == NULL) || (src->meta != dst->meta));
2692 for (meta = src->meta; meta != NULL; meta = meta->next)
2693 {
2694 if (meta->type == NM_TYPE_STRING)
2695 plugin_notification_meta_add_string (dst, meta->name,
2696 meta->nm_value.nm_string);
2697 else if (meta->type == NM_TYPE_SIGNED_INT)
2698 plugin_notification_meta_add_signed_int (dst, meta->name,
2699 meta->nm_value.nm_signed_int);
2700 else if (meta->type == NM_TYPE_UNSIGNED_INT)
2701 plugin_notification_meta_add_unsigned_int (dst, meta->name,
2702 meta->nm_value.nm_unsigned_int);
2703 else if (meta->type == NM_TYPE_DOUBLE)
2704 plugin_notification_meta_add_double (dst, meta->name,
2705 meta->nm_value.nm_double);
2706 else if (meta->type == NM_TYPE_BOOLEAN)
2707 plugin_notification_meta_add_boolean (dst, meta->name,
2708 meta->nm_value.nm_boolean);
2709 }
2711 return (0);
2712 } /* int plugin_notification_meta_copy */
2714 int plugin_notification_meta_free (notification_meta_t *n)
2715 {
2716 notification_meta_t *this;
2717 notification_meta_t *next;
2719 if (n == NULL)
2720 {
2721 ERROR ("plugin_notification_meta_free: n == NULL!");
2722 return (-1);
2723 }
2725 this = n;
2726 while (this != NULL)
2727 {
2728 next = this->next;
2730 if (this->type == NM_TYPE_STRING)
2731 {
2732 /* Assign to a temporary variable to work around nm_string's const
2733 * modifier. */
2734 void *tmp = (void *) this->nm_value.nm_string;
2736 sfree (tmp);
2737 this->nm_value.nm_string = NULL;
2738 }
2739 sfree (this);
2741 this = next;
2742 }
2744 return (0);
2745 } /* int plugin_notification_meta_free */
2747 static void plugin_ctx_destructor (void *ctx)
2748 {
2749 sfree (ctx);
2750 } /* void plugin_ctx_destructor */
2752 static plugin_ctx_t ctx_init = { /* interval = */ 0 };
2754 static plugin_ctx_t *plugin_ctx_create (void)
2755 {
2756 plugin_ctx_t *ctx;
2758 ctx = malloc (sizeof (*ctx));
2759 if (ctx == NULL) {
2760 char errbuf[1024];
2761 ERROR ("Failed to allocate plugin context: %s",
2762 sstrerror (errno, errbuf, sizeof (errbuf)));
2763 return NULL;
2764 }
2766 *ctx = ctx_init;
2767 assert (plugin_ctx_key_initialized);
2768 pthread_setspecific (plugin_ctx_key, ctx);
2769 DEBUG("Created new plugin context.");
2770 return (ctx);
2771 } /* int plugin_ctx_create */
2773 void plugin_init_ctx (void)
2774 {
2775 pthread_key_create (&plugin_ctx_key, plugin_ctx_destructor);
2776 plugin_ctx_key_initialized = 1;
2777 } /* void plugin_init_ctx */
2779 plugin_ctx_t plugin_get_ctx (void)
2780 {
2781 plugin_ctx_t *ctx;
2783 assert (plugin_ctx_key_initialized);
2784 ctx = pthread_getspecific (plugin_ctx_key);
2786 if (ctx == NULL) {
2787 ctx = plugin_ctx_create ();
2788 /* this must no happen -- exit() instead? */
2789 if (ctx == NULL)
2790 return ctx_init;
2791 }
2793 return (*ctx);
2794 } /* plugin_ctx_t plugin_get_ctx */
2796 plugin_ctx_t plugin_set_ctx (plugin_ctx_t ctx)
2797 {
2798 plugin_ctx_t *c;
2799 plugin_ctx_t old;
2801 assert (plugin_ctx_key_initialized);
2802 c = pthread_getspecific (plugin_ctx_key);
2804 if (c == NULL) {
2805 c = plugin_ctx_create ();
2806 /* this must no happen -- exit() instead? */
2807 if (c == NULL)
2808 return ctx_init;
2809 }
2811 old = *c;
2812 *c = ctx;
2814 return (old);
2815 } /* void plugin_set_ctx */
2817 cdtime_t plugin_get_interval (void)
2818 {
2819 cdtime_t interval;
2821 interval = plugin_get_ctx().interval;
2822 if (interval > 0)
2823 return interval;
2825 return cf_get_default_interval ();
2826 } /* cdtime_t plugin_get_interval */
2828 typedef struct {
2829 plugin_ctx_t ctx;
2830 void *(*start_routine) (void *);
2831 void *arg;
2832 } plugin_thread_t;
2834 static void *plugin_thread_start (void *arg)
2835 {
2836 plugin_thread_t *plugin_thread = arg;
2838 void *(*start_routine) (void *) = plugin_thread->start_routine;
2839 void *plugin_arg = plugin_thread->arg;
2841 plugin_set_ctx (plugin_thread->ctx);
2843 sfree (plugin_thread);
2845 return start_routine (plugin_arg);
2846 } /* void *plugin_thread_start */
2848 int plugin_thread_create (pthread_t *thread, const pthread_attr_t *attr,
2849 void *(*start_routine) (void *), void *arg)
2850 {
2851 plugin_thread_t *plugin_thread;
2853 plugin_thread = malloc (sizeof (*plugin_thread));
2854 if (plugin_thread == NULL)
2855 return -1;
2857 plugin_thread->ctx = plugin_get_ctx ();
2858 plugin_thread->start_routine = start_routine;
2859 plugin_thread->arg = arg;
2861 return pthread_create (thread, attr,
2862 plugin_thread_start, plugin_thread);
2863 } /* int plugin_thread_create */
2865 /* vim: set sw=8 ts=8 noet fdm=marker : */