2 * collectd - src/perl.c
3 * Copyright (C) 2007, 2008 Sebastian Harl
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.
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.
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
19 * Sebastian Harl <sh at tokkee.org>
23 * This plugin embeds a Perl interpreter into collectd and provides an
24 * interface for collectd plugins written in perl.
27 /* do not automatically get the thread specific perl interpreter */
28 #define PERL_NO_GET_CONTEXT
32 #include "configfile.h"
39 /* Some versions of Perl define their own version of DEBUG... :-/ */
44 /* ... while we want the definition found in plugin.h. */
50 #if !defined(USE_ITHREADS)
51 # error "Perl does not support ithreads!"
52 #endif /* !defined(USE_ITHREADS) */
54 /* clear the Perl sub's stack frame
55 * (this should only be used inside an XSUB) */
56 #define CLEAR_STACK_FRAME PL_stack_sp = PL_stack_base + *PL_markstack_ptr
60 #define PLUGIN_WRITE 2
61 #define PLUGIN_SHUTDOWN 3
63 #define PLUGIN_NOTIF 5
65 #define PLUGIN_TYPES 6
67 #define PLUGIN_DATASET 255
69 #define log_debug(...) DEBUG ("perl: " __VA_ARGS__)
70 #define log_info(...) INFO ("perl: " __VA_ARGS__)
71 #define log_warn(...) WARNING ("perl: " __VA_ARGS__)
72 #define log_err(...) ERROR ("perl: " __VA_ARGS__)
74 /* this is defined in DynaLoader.a */
75 void boot_DynaLoader (PerlInterpreter *, CV *);
77 static XS (Collectd_plugin_register_ds);
78 static XS (Collectd_plugin_unregister_ds);
79 static XS (Collectd_plugin_dispatch_values);
80 static XS (Collectd_plugin_dispatch_notification);
81 static XS (Collectd_plugin_log);
82 static XS (Collectd_call_by_name);
88 typedef struct c_ithread_s {
89 /* the thread's Perl interpreter */
90 PerlInterpreter *interp;
92 /* double linked list of threads */
93 struct c_ithread_s *prev;
94 struct c_ithread_s *next;
102 /* some usage stats */
103 int number_of_threads;
104 #endif /* COLLECT_DEBUG */
106 pthread_mutex_t mutex;
113 /* if perl_threads != NULL perl_threads->head must
114 * point to the "base" thread */
115 static c_ithread_list_t *perl_threads = NULL;
117 /* the key used to store each pthread's ithread */
118 static pthread_key_t perl_thr_key;
120 static int perl_argc = 0;
121 static char **perl_argv = NULL;
123 static char base_name[DATA_MAX_NAME_LEN] = "";
130 { "Collectd::plugin_register_data_set", Collectd_plugin_register_ds },
131 { "Collectd::plugin_unregister_data_set", Collectd_plugin_unregister_ds },
132 { "Collectd::plugin_dispatch_values", Collectd_plugin_dispatch_values },
133 { "Collectd::plugin_dispatch_notification",
134 Collectd_plugin_dispatch_notification },
135 { "Collectd::plugin_log", Collectd_plugin_log },
136 { "Collectd::call_by_name", Collectd_call_by_name },
145 { "Collectd::TYPE_INIT", PLUGIN_INIT },
146 { "Collectd::TYPE_READ", PLUGIN_READ },
147 { "Collectd::TYPE_WRITE", PLUGIN_WRITE },
148 { "Collectd::TYPE_SHUTDOWN", PLUGIN_SHUTDOWN },
149 { "Collectd::TYPE_LOG", PLUGIN_LOG },
150 { "Collectd::TYPE_NOTIF", PLUGIN_NOTIF },
151 { "Collectd::TYPE_DATASET", PLUGIN_DATASET },
152 { "Collectd::DS_TYPE_COUNTER", DS_TYPE_COUNTER },
153 { "Collectd::DS_TYPE_GAUGE", DS_TYPE_GAUGE },
154 { "Collectd::LOG_ERR", LOG_ERR },
155 { "Collectd::LOG_WARNING", LOG_WARNING },
156 { "Collectd::LOG_NOTICE", LOG_NOTICE },
157 { "Collectd::LOG_INFO", LOG_INFO },
158 { "Collectd::LOG_DEBUG", LOG_DEBUG },
159 { "Collectd::NOTIF_FAILURE", NOTIF_FAILURE },
160 { "Collectd::NOTIF_WARNING", NOTIF_WARNING },
161 { "Collectd::NOTIF_OKAY", NOTIF_OKAY },
170 { "Collectd::hostname_g", hostname_g },
179 { "Collectd::interval_g", &interval_g },
184 * Helper functions for data type conversion.
199 static int hv2data_source (pTHX_ HV *hash, data_source_t *ds)
203 if ((NULL == hash) || (NULL == ds))
206 if (NULL != (tmp = hv_fetch (hash, "name", 4, 0))) {
207 strncpy (ds->name, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
208 ds->name[DATA_MAX_NAME_LEN - 1] = '\0';
211 log_err ("hv2data_source: No DS name given.");
215 if (NULL != (tmp = hv_fetch (hash, "type", 4, 0))) {
216 ds->type = SvIV (*tmp);
218 if ((DS_TYPE_COUNTER != ds->type) && (DS_TYPE_GAUGE != ds->type)) {
219 log_err ("hv2data_source: Invalid DS type.");
224 ds->type = DS_TYPE_COUNTER;
227 if (NULL != (tmp = hv_fetch (hash, "min", 3, 0)))
228 ds->min = SvNV (*tmp);
232 if (NULL != (tmp = hv_fetch (hash, "max", 3, 0)))
233 ds->max = SvNV (*tmp);
237 } /* static data_source_t *hv2data_source (HV *) */
239 static int av2value (pTHX_ char *name, AV *array, value_t *value, int len)
241 const data_set_t *ds;
245 if ((NULL == name) || (NULL == array) || (NULL == value))
248 if (av_len (array) < len - 1)
249 len = av_len (array) + 1;
254 ds = plugin_get_ds (name);
256 log_err ("av2value: Unknown dataset \"%s\"", name);
260 if (ds->ds_num < len) {
261 log_warn ("av2value: Value length exceeds data set length.");
265 for (i = 0; i < len; ++i) {
266 SV **tmp = av_fetch (array, i, 0);
269 if (DS_TYPE_COUNTER == ds->ds[i].type)
270 value[i].counter = SvIV (*tmp);
272 value[i].gauge = SvNV (*tmp);
279 } /* static int av2value (char *, AV *, value_t *, int) */
281 static int data_set2av (pTHX_ data_set_t *ds, AV *array)
285 if ((NULL == ds) || (NULL == array))
288 av_extend (array, ds->ds_num);
290 for (i = 0; i < ds->ds_num; ++i) {
291 HV *source = newHV ();
293 if (NULL == hv_store (source, "name", 4,
294 newSVpv (ds->ds[i].name, 0), 0))
297 if (NULL == hv_store (source, "type", 4, newSViv (ds->ds[i].type), 0))
300 if (! isnan (ds->ds[i].min))
301 if (NULL == hv_store (source, "min", 3,
302 newSVnv (ds->ds[i].min), 0))
305 if (! isnan (ds->ds[i].max))
306 if (NULL == hv_store (source, "max", 3,
307 newSVnv (ds->ds[i].max), 0))
310 if (NULL == av_store (array, i, newRV_noinc ((SV *)source)))
314 } /* static int data_set2av (data_set_t *, AV *) */
316 static int value_list2hv (pTHX_ value_list_t *vl, data_set_t *ds, HV *hash)
323 if ((NULL == vl) || (NULL == ds) || (NULL == hash))
326 len = vl->values_len;
328 if (ds->ds_num < len) {
329 log_warn ("value2av: Value length exceeds data set length.");
334 av_extend (values, len - 1);
336 for (i = 0; i < len; ++i) {
339 if (DS_TYPE_COUNTER == ds->ds[i].type)
340 val = newSViv (vl->values[i].counter);
342 val = newSVnv (vl->values[i].gauge);
344 if (NULL == av_store (values, i, val)) {
350 if (NULL == hv_store (hash, "values", 6, newRV_noinc ((SV *)values), 0))
354 if (NULL == hv_store (hash, "time", 4, newSViv (vl->time), 0))
357 if ('\0' != vl->host[0])
358 if (NULL == hv_store (hash, "host", 4, newSVpv (vl->host, 0), 0))
361 if ('\0' != vl->plugin[0])
362 if (NULL == hv_store (hash, "plugin", 6, newSVpv (vl->plugin, 0), 0))
365 if ('\0' != vl->plugin_instance[0])
366 if (NULL == hv_store (hash, "plugin_instance", 15,
367 newSVpv (vl->plugin_instance, 0), 0))
370 if ('\0' != vl->type[0])
371 if (NULL == hv_store (hash, "type", 4, newSVpv (vl->type, 0), 0))
374 if ('\0' != vl->type_instance[0])
375 if (NULL == hv_store (hash, "type_instance", 13,
376 newSVpv (vl->type_instance, 0), 0))
379 } /* static int value2av (value_list_t *, data_set_t *, HV *) */
381 static int notification2hv (pTHX_ notification_t *n, HV *hash)
383 if (NULL == hv_store (hash, "severity", 8, newSViv (n->severity), 0))
387 if (NULL == hv_store (hash, "time", 4, newSViv (n->time), 0))
390 if ('\0' != *n->message)
391 if (NULL == hv_store (hash, "message", 7, newSVpv (n->message, 0), 0))
394 if ('\0' != *n->host)
395 if (NULL == hv_store (hash, "host", 4, newSVpv (n->host, 0), 0))
398 if ('\0' != *n->plugin)
399 if (NULL == hv_store (hash, "plugin", 6, newSVpv (n->plugin, 0), 0))
402 if ('\0' != *n->plugin_instance)
403 if (NULL == hv_store (hash, "plugin_instance", 15,
404 newSVpv (n->plugin_instance, 0), 0))
407 if ('\0' != *n->type)
408 if (NULL == hv_store (hash, "type", 4, newSVpv (n->type, 0), 0))
411 if ('\0' != *n->type_instance)
412 if (NULL == hv_store (hash, "type_instance", 13,
413 newSVpv (n->type_instance, 0), 0))
416 } /* static int notification2hv (notification_t *, HV *) */
419 * Internal functions.
422 static char *get_module_name (char *buf, size_t buf_len, const char *module) {
424 if (base_name[0] == '\0')
425 status = snprintf (buf, buf_len, "%s", module);
427 status = snprintf (buf, buf_len, "%s::%s", base_name, module);
428 if ((status < 0) || ((unsigned int)status >= buf_len))
430 buf[buf_len - 1] = '\0';
432 } /* char *get_module_name */
435 * Add a plugin's data set definition.
437 static int pplugin_register_data_set (pTHX_ char *name, AV *dataset)
443 data_source_t *ds = NULL;
444 data_set_t *set = NULL;
446 if ((NULL == name) || (NULL == dataset))
449 len = av_len (dataset);
454 ds = (data_source_t *)smalloc ((len + 1) * sizeof (data_source_t));
455 set = (data_set_t *)smalloc (sizeof (data_set_t));
457 for (i = 0; i <= len; ++i) {
458 SV **elem = av_fetch (dataset, i, 0);
463 if (! (SvROK (*elem) && (SVt_PVHV == SvTYPE (SvRV (*elem))))) {
464 log_err ("pplugin_register_data_set: Invalid data source.");
468 if (-1 == hv2data_source (aTHX_ (HV *)SvRV (*elem), &ds[i]))
471 log_debug ("pplugin_register_data_set: "
472 "DS.name = \"%s\", DS.type = %i, DS.min = %f, DS.max = %f",
473 ds[i].name, ds[i].type, ds[i].min, ds[i].max);
476 strncpy (set->type, name, DATA_MAX_NAME_LEN);
477 set->type[DATA_MAX_NAME_LEN - 1] = '\0';
479 set->ds_num = len + 1;
482 ret = plugin_register_data_set (set);
487 } /* static int pplugin_register_data_set (char *, SV *) */
490 * Remove a plugin's data set definition.
492 static int pplugin_unregister_data_set (char *name)
496 return plugin_unregister_data_set (name);
497 } /* static int pplugin_unregister_data_set (char *) */
500 * Submit the values to the write functions.
504 * values => [ @values ],
508 * plugin_instance => $pinstance,
509 * type_instance => $tinstance,
512 static int pplugin_dispatch_values (pTHX_ HV *values)
514 value_list_t list = VALUE_LIST_INIT;
524 if (NULL == (tmp = hv_fetch (values, "type", 4, 0))) {
525 log_err ("pplugin_dispatch_values: No type given.");
529 strncpy (list.type, SvPV_nolen (*tmp), sizeof (list.type));
530 list.type[DATA_MAX_NAME_LEN - 1] = '\0';
532 if ((NULL == (tmp = hv_fetch (values, "values", 6, 0)))
533 || (! (SvROK (*tmp) && (SVt_PVAV == SvTYPE (SvRV (*tmp)))))) {
534 log_err ("pplugin_dispatch_values: No valid values given.");
539 AV *array = (AV *)SvRV (*tmp);
540 int len = av_len (array) + 1;
545 val = (value_t *)smalloc (len * sizeof (value_t));
547 list.values_len = av2value (aTHX_ list.type, (AV *)SvRV (*tmp),
551 if (-1 == list.values_len) {
557 if (NULL != (tmp = hv_fetch (values, "time", 4, 0))) {
558 list.time = (time_t)SvIV (*tmp);
561 list.time = time (NULL);
564 if (NULL != (tmp = hv_fetch (values, "host", 4, 0))) {
565 strncpy (list.host, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
566 list.host[DATA_MAX_NAME_LEN - 1] = '\0';
569 strcpy (list.host, hostname_g);
572 if (NULL != (tmp = hv_fetch (values, "plugin", 6, 0))) {
573 strncpy (list.plugin, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
574 list.plugin[DATA_MAX_NAME_LEN - 1] = '\0';
577 if (NULL != (tmp = hv_fetch (values, "plugin_instance", 15, 0))) {
578 strncpy (list.plugin_instance, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
579 list.plugin_instance[DATA_MAX_NAME_LEN - 1] = '\0';
582 if (NULL != (tmp = hv_fetch (values, "type_instance", 13, 0))) {
583 strncpy (list.type_instance, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
584 list.type_instance[DATA_MAX_NAME_LEN - 1] = '\0';
587 ret = plugin_dispatch_values (&list);
591 } /* static int pplugin_dispatch_values (char *, HV *) */
594 * Dispatch a notification.
598 * severity => $severity,
604 * plugin_instance => $instance,
605 * type_instance => $type_instance
608 static int pplugin_dispatch_notification (pTHX_ HV *notif)
617 memset (&n, 0, sizeof (n));
619 if (NULL != (tmp = hv_fetch (notif, "severity", 8, 0)))
620 n.severity = SvIV (*tmp);
622 n.severity = NOTIF_FAILURE;
624 if (NULL != (tmp = hv_fetch (notif, "time", 4, 0)))
625 n.time = (time_t)SvIV (*tmp);
627 n.time = time (NULL);
629 if (NULL != (tmp = hv_fetch (notif, "message", 7, 0)))
630 strncpy (n.message, SvPV_nolen (*tmp), sizeof (n.message));
631 n.message[sizeof (n.message) - 1] = '\0';
633 if (NULL != (tmp = hv_fetch (notif, "host", 4, 0)))
634 strncpy (n.host, SvPV_nolen (*tmp), sizeof (n.host));
636 strncpy (n.host, hostname_g, sizeof (n.host));
637 n.host[sizeof (n.host) - 1] = '\0';
639 if (NULL != (tmp = hv_fetch (notif, "plugin", 6, 0)))
640 strncpy (n.plugin, SvPV_nolen (*tmp), sizeof (n.plugin));
641 n.plugin[sizeof (n.plugin) - 1] = '\0';
643 if (NULL != (tmp = hv_fetch (notif, "plugin_instance", 15, 0)))
644 strncpy (n.plugin_instance, SvPV_nolen (*tmp),
645 sizeof (n.plugin_instance));
646 n.plugin_instance[sizeof (n.plugin_instance) - 1] = '\0';
648 if (NULL != (tmp = hv_fetch (notif, "type", 4, 0)))
649 strncpy (n.type, SvPV_nolen (*tmp), sizeof (n.type));
650 n.type[sizeof (n.type) - 1] = '\0';
652 if (NULL != (tmp = hv_fetch (notif, "type_instance", 13, 0)))
653 strncpy (n.type_instance, SvPV_nolen (*tmp), sizeof (n.type_instance));
654 n.type_instance[sizeof (n.type_instance) - 1] = '\0';
655 return plugin_dispatch_notification (&n);
656 } /* static int pplugin_dispatch_notification (HV *) */
659 * Call all working functions of the given type.
661 static int pplugin_call_all (pTHX_ int type, ...)
670 if ((type < 0) || (type >= PLUGIN_TYPES))
680 XPUSHs (sv_2mortal (newSViv ((IV)type)));
682 if (PLUGIN_WRITE == type) {
684 * $_[0] = $plugin_type;
699 * values => [ $v1, ... ],
704 * plugin_instance => $instance,
705 * type_instance => $type_instance
714 ds = va_arg (ap, data_set_t *);
715 vl = va_arg (ap, value_list_t *);
717 if (-1 == data_set2av (aTHX_ ds, pds)) {
724 if (-1 == value_list2hv (aTHX_ vl, ds, pvl)) {
731 XPUSHs (sv_2mortal (newSVpv (ds->type, 0)));
732 XPUSHs (sv_2mortal (newRV_noinc ((SV *)pds)));
733 XPUSHs (sv_2mortal (newRV_noinc ((SV *)pvl)));
735 else if (PLUGIN_LOG == type) {
741 XPUSHs (sv_2mortal (newSViv (va_arg (ap, int))));
742 XPUSHs (sv_2mortal (newSVpv (va_arg (ap, char *), 0)));
744 else if (PLUGIN_NOTIF == type) {
748 * severity => $severity,
754 * plugin_instance => $instance,
755 * type_instance => $type_instance
759 HV *notif = newHV ();
761 n = va_arg (ap, notification_t *);
763 if (-1 == notification2hv (aTHX_ n, notif)) {
770 XPUSHs (sv_2mortal (newRV_noinc ((SV *)notif)));
775 retvals = call_pv ("Collectd::plugin_call_all", G_SCALAR);
790 } /* static int pplugin_call_all (int, ...) */
797 * Collectd::plugin_register_data_set (type, dataset).
800 * type of the dataset
803 * dataset to be registered
805 static XS (Collectd_plugin_register_ds)
813 log_err ("Usage: Collectd::plugin_register_data_set(type, dataset)");
817 log_debug ("Collectd::plugin_register_data_set: "
818 "type = \"%s\", dataset = \"%s\"",
819 SvPV_nolen (ST (0)), SvPV_nolen (ST (1)));
823 if (SvROK (data) && (SVt_PVAV == SvTYPE (SvRV (data)))) {
824 ret = pplugin_register_data_set (aTHX_ SvPV_nolen (ST (0)),
828 log_err ("Collectd::plugin_register_data_set: Invalid data.");
836 } /* static XS (Collectd_plugin_register_ds) */
839 * Collectd::plugin_unregister_data_set (type).
842 * type of the dataset
844 static XS (Collectd_plugin_unregister_ds)
849 log_err ("Usage: Collectd::plugin_unregister_data_set(type)");
853 log_debug ("Collectd::plugin_unregister_data_set: type = \"%s\"",
854 SvPV_nolen (ST (0)));
856 if (0 == pplugin_unregister_data_set (SvPV_nolen (ST (0))))
860 } /* static XS (Collectd_plugin_register_ds) */
863 * Collectd::plugin_dispatch_values (name, values).
869 * value list to submit
871 static XS (Collectd_plugin_dispatch_values)
881 log_warn ("Collectd::plugin_dispatch_values with two arguments "
882 "is deprecated - pass the type through values->{type}.");
885 else if (1 != items) {
886 log_err ("Usage: Collectd::plugin_dispatch_values(values)");
890 log_debug ("Collectd::plugin_dispatch_values: values=\"%s\"",
891 SvPV_nolen (ST (values_idx)));
893 values = ST (values_idx);
895 if (! (SvROK (values) && (SVt_PVHV == SvTYPE (SvRV (values))))) {
896 log_err ("Collectd::plugin_dispatch_values: Invalid values.");
900 if (((2 == items) && (NULL == ST (0))) || (NULL == values))
903 if ((2 == items) && (NULL == hv_store ((HV *)SvRV (values), "type", 4,
904 newSVsv (ST (0)), 0))) {
905 log_err ("Collectd::plugin_dispatch_values: Could not store type.");
909 ret = pplugin_dispatch_values (aTHX_ (HV *)SvRV (values));
915 } /* static XS (Collectd_plugin_dispatch_values) */
918 * Collectd::plugin_dispatch_notification (notif).
921 * notification to dispatch
923 static XS (Collectd_plugin_dispatch_notification)
932 log_err ("Usage: Collectd::plugin_dispatch_notification(notif)");
936 log_debug ("Collectd::plugin_dispatch_notification: notif = \"%s\"",
937 SvPV_nolen (ST (0)));
941 if (! (SvROK (notif) && (SVt_PVHV == SvTYPE (SvRV (notif))))) {
942 log_err ("Collectd::plugin_dispatch_notification: Invalid notif.");
946 ret = pplugin_dispatch_notification (aTHX_ (HV *)SvRV (notif));
952 } /* static XS (Collectd_plugin_dispatch_notification) */
955 * Collectd::plugin_log (level, message).
958 * log level (LOG_DEBUG, ... LOG_ERR)
963 static XS (Collectd_plugin_log)
968 log_err ("Usage: Collectd::plugin_log(level, message)");
972 plugin_log (SvIV (ST (0)), SvPV_nolen (ST (1)));
974 } /* static XS (Collectd_plugin_log) */
977 * Collectd::call_by_name (...).
979 * Call a Perl sub identified by its name passed through $Collectd::cb_name.
981 static XS (Collectd_call_by_name)
986 if (NULL == (tmp = get_sv ("Collectd::cb_name", 0))) {
987 sv_setpv (get_sv ("@", 1), "cb_name has not been set");
992 name = SvPV_nolen (tmp);
994 if (NULL == get_cv (name, 0)) {
995 sv_setpvf (get_sv ("@", 1), "unknown callback \"%s\"", name);
1000 /* simply pass on the subroutine call without touching the stack,
1001 * thus leaving any arguments and return values in place */
1003 } /* static XS (Collectd_call_by_name) */
1006 * collectd's perl interpreter based thread implementation.
1008 * This has been inspired by Perl's ithreads introduced in version 5.6.0.
1011 /* must be called with perl_threads->mutex locked */
1012 static void c_ithread_destroy (c_ithread_t *ithread)
1014 dTHXa (ithread->interp);
1016 assert (NULL != perl_threads);
1018 PERL_SET_CONTEXT (aTHX);
1019 log_debug ("Shutting down Perl interpreter %p...", aTHX);
1024 --perl_threads->number_of_threads;
1025 #endif /* COLLECT_DEBUG */
1027 perl_destruct (aTHX);
1030 if (NULL == ithread->prev)
1031 perl_threads->head = ithread->next;
1033 ithread->prev->next = ithread->next;
1035 if (NULL == ithread->next)
1036 perl_threads->tail = ithread->prev;
1038 ithread->next->prev = ithread->prev;
1042 } /* static void c_ithread_destroy (c_ithread_t *) */
1044 static void c_ithread_destructor (void *arg)
1046 c_ithread_t *ithread = (c_ithread_t *)arg;
1047 c_ithread_t *t = NULL;
1049 if (NULL == perl_threads)
1052 pthread_mutex_lock (&perl_threads->mutex);
1054 for (t = perl_threads->head; NULL != t; t = t->next)
1058 /* the ithread no longer exists */
1062 c_ithread_destroy (ithread);
1064 pthread_mutex_unlock (&perl_threads->mutex);
1066 } /* static void c_ithread_destructor (void *) */
1068 /* must be called with perl_threads->mutex locked */
1069 static c_ithread_t *c_ithread_create (PerlInterpreter *base)
1071 c_ithread_t *t = NULL;
1074 assert (NULL != perl_threads);
1076 t = (c_ithread_t *)smalloc (sizeof (c_ithread_t));
1077 memset (t, 0, sizeof (c_ithread_t));
1079 t->interp = (NULL == base)
1081 : perl_clone (base, CLONEf_KEEP_PTR_TABLE);
1086 av_clear (PL_endav);
1087 av_undef (PL_endav);
1092 ++perl_threads->number_of_threads;
1093 #endif /* COLLECT_DEBUG */
1097 if (NULL == perl_threads->tail) {
1098 perl_threads->head = t;
1102 perl_threads->tail->next = t;
1103 t->prev = perl_threads->tail;
1106 perl_threads->tail = t;
1108 pthread_setspecific (perl_thr_key, (const void *)t);
1110 } /* static c_ithread_t *c_ithread_create (PerlInterpreter *) */
1113 * Interface to collectd.
1116 static int perl_init (void)
1120 if (NULL == perl_threads)
1124 c_ithread_t *t = NULL;
1126 pthread_mutex_lock (&perl_threads->mutex);
1127 t = c_ithread_create (perl_threads->head->interp);
1128 pthread_mutex_unlock (&perl_threads->mutex);
1133 log_debug ("perl_init: c_ithread: interp = %p (active threads: %i)",
1134 aTHX, perl_threads->number_of_threads);
1135 return pplugin_call_all (aTHX_ PLUGIN_INIT);
1136 } /* static int perl_init (void) */
1138 static int perl_read (void)
1142 if (NULL == perl_threads)
1146 c_ithread_t *t = NULL;
1148 pthread_mutex_lock (&perl_threads->mutex);
1149 t = c_ithread_create (perl_threads->head->interp);
1150 pthread_mutex_unlock (&perl_threads->mutex);
1155 log_debug ("perl_read: c_ithread: interp = %p (active threads: %i)",
1156 aTHX, perl_threads->number_of_threads);
1157 return pplugin_call_all (aTHX_ PLUGIN_READ);
1158 } /* static int perl_read (void) */
1160 static int perl_write (const data_set_t *ds, const value_list_t *vl)
1164 if (NULL == perl_threads)
1168 c_ithread_t *t = NULL;
1170 pthread_mutex_lock (&perl_threads->mutex);
1171 t = c_ithread_create (perl_threads->head->interp);
1172 pthread_mutex_unlock (&perl_threads->mutex);
1177 log_debug ("perl_write: c_ithread: interp = %p (active threads: %i)",
1178 aTHX, perl_threads->number_of_threads);
1179 return pplugin_call_all (aTHX_ PLUGIN_WRITE, ds, vl);
1180 } /* static int perl_write (const data_set_t *, const value_list_t *) */
1182 static void perl_log (int level, const char *msg)
1186 if (NULL == perl_threads)
1190 c_ithread_t *t = NULL;
1192 pthread_mutex_lock (&perl_threads->mutex);
1193 t = c_ithread_create (perl_threads->head->interp);
1194 pthread_mutex_unlock (&perl_threads->mutex);
1199 pplugin_call_all (aTHX_ PLUGIN_LOG, level, msg);
1201 } /* static void perl_log (int, const char *) */
1203 static int perl_notify (const notification_t *notif)
1207 if (NULL == perl_threads)
1211 c_ithread_t *t = NULL;
1213 pthread_mutex_lock (&perl_threads->mutex);
1214 t = c_ithread_create (perl_threads->head->interp);
1215 pthread_mutex_unlock (&perl_threads->mutex);
1219 return pplugin_call_all (aTHX_ PLUGIN_NOTIF, notif);
1220 } /* static int perl_notify (const notification_t *) */
1222 static int perl_shutdown (void)
1224 c_ithread_t *t = NULL;
1230 plugin_unregister_complex_config ("perl");
1232 if (NULL == perl_threads)
1236 c_ithread_t *t = NULL;
1238 pthread_mutex_lock (&perl_threads->mutex);
1239 t = c_ithread_create (perl_threads->head->interp);
1240 pthread_mutex_unlock (&perl_threads->mutex);
1245 log_debug ("perl_shutdown: c_ithread: interp = %p (active threads: %i)",
1246 aTHX, perl_threads->number_of_threads);
1248 plugin_unregister_log ("perl");
1249 plugin_unregister_notification ("perl");
1250 plugin_unregister_init ("perl");
1251 plugin_unregister_read ("perl");
1252 plugin_unregister_write ("perl");
1254 ret = pplugin_call_all (aTHX_ PLUGIN_SHUTDOWN);
1256 pthread_mutex_lock (&perl_threads->mutex);
1257 t = perl_threads->tail;
1260 c_ithread_t *thr = t;
1262 /* the pointer has to be advanced before destroying
1263 * the thread as this will free the memory */
1266 c_ithread_destroy (thr);
1269 pthread_mutex_unlock (&perl_threads->mutex);
1270 pthread_mutex_destroy (&perl_threads->mutex);
1272 sfree (perl_threads);
1274 pthread_key_delete (perl_thr_key);
1278 plugin_unregister_shutdown ("perl");
1280 } /* static void perl_shutdown (void) */
1283 * Access functions for global variables.
1285 * These functions implement the "magic" used to access
1286 * the global variables from Perl.
1289 static int g_pv_get (pTHX_ SV *var, MAGIC *mg)
1291 char *pv = mg->mg_ptr;
1294 } /* static int g_pv_get (pTHX_ SV *, MAGIC *) */
1296 static int g_pv_set (pTHX_ SV *var, MAGIC *mg)
1298 char *pv = mg->mg_ptr;
1299 strncpy (pv, SvPV_nolen (var), DATA_MAX_NAME_LEN);
1300 pv[DATA_MAX_NAME_LEN - 1] = '\0';
1302 } /* static int g_pv_set (pTHX_ SV *, MAGIC *) */
1304 static int g_iv_get (pTHX_ SV *var, MAGIC *mg)
1306 int *iv = (int *)mg->mg_ptr;
1307 sv_setiv (var, *iv);
1309 } /* static int g_iv_get (pTHX_ SV *, MAGIC *) */
1311 static int g_iv_set (pTHX_ SV *var, MAGIC *mg)
1313 int *iv = (int *)mg->mg_ptr;
1314 *iv = (int)SvIV (var);
1316 } /* static int g_iv_set (pTHX_ SV *, MAGIC *) */
1318 static MGVTBL g_pv_vtbl = { g_pv_get, g_pv_set, NULL, NULL, NULL, NULL, NULL };
1319 static MGVTBL g_iv_vtbl = { g_iv_get, g_iv_set, NULL, NULL, NULL, NULL, NULL };
1321 /* bootstrap the Collectd module */
1322 static void xs_init (pTHX)
1326 char *file = __FILE__;
1332 /* enable usage of Perl modules using shared libraries */
1333 newXS ("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
1336 for (i = 0; NULL != api[i].f; ++i)
1337 newXS (api[i].name, api[i].f, file);
1339 stash = gv_stashpv ("Collectd", 1);
1341 /* export "constants" */
1342 for (i = 0; '\0' != constants[i].name[0]; ++i)
1343 newCONSTSUB (stash, constants[i].name, newSViv (constants[i].value));
1345 /* export global variables
1346 * by adding "magic" to the SV's representing the globale variables
1347 * perl is able to automagically call the get/set function when
1348 * accessing any such variable (this is basically the same as using
1350 /* global strings */
1351 for (i = 0; '\0' != g_strings[i].name[0]; ++i) {
1352 tmp = get_sv (g_strings[i].name, 1);
1353 sv_magicext (tmp, NULL, PERL_MAGIC_ext, &g_pv_vtbl,
1354 g_strings[i].var, 0);
1357 /* global integers */
1358 for (i = 0; '\0' != g_integers[i].name[0]; ++i) {
1359 tmp = get_sv (g_integers[i].name, 1);
1360 sv_magicext (tmp, NULL, PERL_MAGIC_ext, &g_iv_vtbl,
1361 (char *)g_integers[i].var, 0);
1364 } /* static void xs_init (pTHX) */
1366 /* Initialize the global Perl interpreter. */
1367 static int init_pi (int argc, char **argv)
1371 if (NULL != perl_threads)
1374 log_info ("Initializing Perl interpreter...");
1379 for (i = 0; i < argc; ++i)
1380 log_debug ("argv[%i] = \"%s\"", i, argv[i]);
1382 #endif /* COLLECT_DEBUG */
1384 if (0 != pthread_key_create (&perl_thr_key, c_ithread_destructor)) {
1385 log_err ("init_pi: pthread_key_create failed");
1387 /* this must not happen - cowardly giving up if it does */
1391 PERL_SYS_INIT3 (&argc, &argv, &environ);
1393 perl_threads = (c_ithread_list_t *)smalloc (sizeof (c_ithread_list_t));
1394 memset (perl_threads, 0, sizeof (c_ithread_list_t));
1396 pthread_mutex_init (&perl_threads->mutex, NULL);
1397 /* locking the mutex should not be necessary at this point
1398 * but let's just do it for the sake of completeness */
1399 pthread_mutex_lock (&perl_threads->mutex);
1401 perl_threads->head = c_ithread_create (NULL);
1402 perl_threads->tail = perl_threads->head;
1404 if (NULL == (perl_threads->head->interp = perl_alloc ())) {
1405 log_err ("init_pi: Not enough memory.");
1409 aTHX = perl_threads->head->interp;
1410 pthread_mutex_unlock (&perl_threads->mutex);
1412 perl_construct (aTHX);
1414 PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
1416 if (0 != perl_parse (aTHX_ xs_init, argc, argv, NULL)) {
1417 log_err ("init_pi: Unable to bootstrap Collectd.");
1421 /* Set $0 to "collectd" because perl_parse() has to set it to "-e". */
1422 sv_setpv (get_sv ("0", 0), "collectd");
1426 plugin_register_log ("perl", perl_log);
1427 plugin_register_notification ("perl", perl_notify);
1428 plugin_register_init ("perl", perl_init);
1430 plugin_register_read ("perl", perl_read);
1432 plugin_register_write ("perl", perl_write);
1433 plugin_register_shutdown ("perl", perl_shutdown);
1435 } /* static int init_pi (const char **, const int) */
1438 * LoadPlugin "<Plugin>"
1440 static int perl_config_loadplugin (pTHX_ oconfig_item_t *ci)
1442 char module_name[DATA_MAX_NAME_LEN];
1446 if ((0 != ci->children_num) || (1 != ci->values_num)
1447 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1448 log_err ("LoadPlugin expects a single string argument.");
1452 value = ci->values[0].value.string;
1454 if (NULL == get_module_name (module_name, sizeof (module_name), value)) {
1455 log_err ("Invalid module name %s", value);
1459 init_pi (perl_argc, perl_argv);
1460 assert (NULL != perl_threads);
1461 assert (NULL != perl_threads->head);
1463 aTHX = perl_threads->head->interp;
1465 log_debug ("perl_config: loading perl plugin \"%s\"", value);
1466 load_module (PERL_LOADMOD_NOIMPORT,
1467 newSVpv (module_name, strlen (module_name)), Nullsv);
1469 } /* static int perl_config_loadplugin (oconfig_item_it *) */
1474 static int perl_config_basename (pTHX_ oconfig_item_t *ci)
1478 if ((0 != ci->children_num) || (1 != ci->values_num)
1479 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1480 log_err ("BaseName expects a single string argument.");
1484 value = ci->values[0].value.string;
1486 log_debug ("perl_config: Setting plugin basename to \"%s\"", value);
1487 strncpy (base_name, value, sizeof (base_name));
1488 base_name[sizeof (base_name) - 1] = '\0';
1490 } /* static int perl_config_basename (oconfig_item_it *) */
1493 * EnableDebugger "<Package>"|""
1495 static int perl_config_enabledebugger (pTHX_ oconfig_item_t *ci)
1499 if ((0 != ci->children_num) || (1 != ci->values_num)
1500 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1501 log_err ("EnableDebugger expects a single string argument.");
1505 if (NULL != perl_threads) {
1506 log_warn ("EnableDebugger has no effects if used after LoadPlugin.");
1510 value = ci->values[0].value.string;
1512 perl_argv = (char **)realloc (perl_argv,
1513 (++perl_argc + 1) * sizeof (char *));
1515 if (NULL == perl_argv) {
1516 log_err ("perl_config: Not enough memory.");
1520 if ('\0' == value[0]) {
1521 perl_argv[perl_argc - 1] = "-d";
1524 perl_argv[perl_argc - 1] = (char *)smalloc (strlen (value) + 4);
1525 sstrncpy (perl_argv[perl_argc - 1], "-d:", 4);
1526 sstrncpy (perl_argv[perl_argc - 1] + 3, value, strlen (value) + 1);
1529 perl_argv[perl_argc] = NULL;
1531 } /* static int perl_config_enabledebugger (oconfig_item_it *) */
1534 * IncludeDir "<Dir>"
1536 static int perl_config_includedir (pTHX_ oconfig_item_t *ci)
1540 if ((0 != ci->children_num) || (1 != ci->values_num)
1541 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1542 log_err ("IncludeDir expects a single string argument.");
1546 value = ci->values[0].value.string;
1549 perl_argv = (char **)realloc (perl_argv,
1550 (++perl_argc + 1) * sizeof (char *));
1552 if (NULL == perl_argv) {
1553 log_err ("perl_config: Not enough memory.");
1557 perl_argv[perl_argc - 1] = (char *)smalloc (strlen (value) + 3);
1558 sstrncpy(perl_argv[perl_argc - 1], "-I", 3);
1559 sstrncpy(perl_argv[perl_argc - 1] + 2, value, strlen (value) + 1);
1561 perl_argv[perl_argc] = NULL;
1564 /* prepend the directory to @INC */
1565 av_unshift (GvAVn (PL_incgv), 1);
1566 av_store (GvAVn (PL_incgv), 0, newSVpv (value, strlen (value)));
1569 } /* static int perl_config_includedir (oconfig_item_it *) */
1571 static int perl_config (oconfig_item_t *ci)
1577 /* dTHX does not get any valid values in case Perl
1578 * has not been initialized */
1579 if (NULL == perl_threads)
1582 for (i = 0; i < ci->children_num; ++i) {
1583 oconfig_item_t *c = ci->children + i;
1585 if (0 == strcasecmp (c->key, "LoadPlugin"))
1586 perl_config_loadplugin (aTHX_ c);
1587 else if (0 == strcasecmp (c->key, "BaseName"))
1588 perl_config_basename (aTHX_ c);
1589 else if (0 == strcasecmp (c->key, "EnableDebugger"))
1590 perl_config_enabledebugger (aTHX_ c);
1591 else if (0 == strcasecmp (c->key, "IncludeDir"))
1592 perl_config_includedir (aTHX_ c);
1594 log_warn ("Ignoring unknown config key \"%s\".", c->key);
1597 } /* static int perl_config (oconfig_item_t *) */
1599 void module_register (void)
1602 perl_argv = (char **)smalloc ((perl_argc + 1) * sizeof (char *));
1604 /* default options for the Perl interpreter */
1606 perl_argv[1] = "-MCollectd";
1607 perl_argv[2] = "-e";
1609 perl_argv[4] = NULL;
1611 plugin_register_complex_config ("perl", perl_config);
1613 } /* void module_register (void) */
1615 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */