2 * collectd - src/perl.c
3 * Copyright (C) 2007 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
64 #define PLUGIN_TYPES 5
66 #define PLUGIN_DATASET 255
68 #define log_debug(...) DEBUG ("perl: " __VA_ARGS__)
69 #define log_info(...) INFO ("perl: " __VA_ARGS__)
70 #define log_warn(...) WARNING ("perl: " __VA_ARGS__)
71 #define log_err(...) ERROR ("perl: " __VA_ARGS__)
73 /* this is defined in DynaLoader.a */
74 void boot_DynaLoader (PerlInterpreter *, CV *);
76 static XS (Collectd_plugin_register_ds);
77 static XS (Collectd_plugin_unregister_ds);
78 static XS (Collectd_plugin_dispatch_values);
79 static XS (Collectd_plugin_log);
80 static XS (Collectd_call_by_name);
86 typedef struct c_ithread_s {
87 /* the thread's Perl interpreter */
88 PerlInterpreter *interp;
90 /* double linked list of threads */
91 struct c_ithread_s *prev;
92 struct c_ithread_s *next;
100 /* some usage stats */
101 int number_of_threads;
102 #endif /* COLLECT_DEBUG */
104 pthread_mutex_t mutex;
111 /* if perl_threads != NULL perl_threads->head must
112 * point to the "base" thread */
113 static c_ithread_list_t *perl_threads = NULL;
115 /* the key used to store each pthread's ithread */
116 static pthread_key_t perl_thr_key;
118 static int perl_argc = 0;
119 static char **perl_argv = NULL;
121 static char base_name[DATA_MAX_NAME_LEN] = "";
128 { "Collectd::plugin_register_data_set", Collectd_plugin_register_ds },
129 { "Collectd::plugin_unregister_data_set", Collectd_plugin_unregister_ds },
130 { "Collectd::plugin_dispatch_values", Collectd_plugin_dispatch_values },
131 { "Collectd::plugin_log", Collectd_plugin_log },
132 { "Collectd::call_by_name", Collectd_call_by_name },
141 { "Collectd::TYPE_INIT", PLUGIN_INIT },
142 { "Collectd::TYPE_READ", PLUGIN_READ },
143 { "Collectd::TYPE_WRITE", PLUGIN_WRITE },
144 { "Collectd::TYPE_SHUTDOWN", PLUGIN_SHUTDOWN },
145 { "Collectd::TYPE_LOG", PLUGIN_LOG },
146 { "Collectd::TYPE_DATASET", PLUGIN_DATASET },
147 { "Collectd::DS_TYPE_COUNTER", DS_TYPE_COUNTER },
148 { "Collectd::DS_TYPE_GAUGE", DS_TYPE_GAUGE },
149 { "Collectd::LOG_ERR", LOG_ERR },
150 { "Collectd::LOG_WARNING", LOG_WARNING },
151 { "Collectd::LOG_NOTICE", LOG_NOTICE },
152 { "Collectd::LOG_INFO", LOG_INFO },
153 { "Collectd::LOG_DEBUG", LOG_DEBUG },
162 { "Collectd::hostname_g", hostname_g },
171 { "Collectd::interval_g", &interval_g },
176 * Helper functions for data type conversion.
191 static int hv2data_source (pTHX_ HV *hash, data_source_t *ds)
195 if ((NULL == hash) || (NULL == ds))
198 if (NULL != (tmp = hv_fetch (hash, "name", 4, 0))) {
199 strncpy (ds->name, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
200 ds->name[DATA_MAX_NAME_LEN - 1] = '\0';
203 log_err ("hv2data_source: No DS name given.");
207 if (NULL != (tmp = hv_fetch (hash, "type", 4, 0))) {
208 ds->type = SvIV (*tmp);
210 if ((DS_TYPE_COUNTER != ds->type) && (DS_TYPE_GAUGE != ds->type)) {
211 log_err ("hv2data_source: Invalid DS type.");
216 ds->type = DS_TYPE_COUNTER;
219 if (NULL != (tmp = hv_fetch (hash, "min", 3, 0)))
220 ds->min = SvNV (*tmp);
224 if (NULL != (tmp = hv_fetch (hash, "max", 3, 0)))
225 ds->max = SvNV (*tmp);
229 } /* static data_source_t *hv2data_source (HV *) */
231 static int av2value (pTHX_ char *name, AV *array, value_t *value, int len)
233 const data_set_t *ds;
237 if ((NULL == name) || (NULL == array) || (NULL == value))
240 if (av_len (array) < len - 1)
241 len = av_len (array) + 1;
246 ds = plugin_get_ds (name);
248 log_err ("av2value: Unknown dataset \"%s\"", name);
252 if (ds->ds_num < len) {
253 log_warn ("av2value: Value length exceeds data set length.");
257 for (i = 0; i < len; ++i) {
258 SV **tmp = av_fetch (array, i, 0);
261 if (DS_TYPE_COUNTER == ds->ds[i].type)
262 value[i].counter = SvIV (*tmp);
264 value[i].gauge = SvNV (*tmp);
271 } /* static int av2value (char *, AV *, value_t *, int) */
273 static int data_set2av (pTHX_ data_set_t *ds, AV *array)
277 if ((NULL == ds) || (NULL == array))
280 av_extend (array, ds->ds_num);
282 for (i = 0; i < ds->ds_num; ++i) {
283 HV *source = newHV ();
285 if (NULL == hv_store (source, "name", 4,
286 newSVpv (ds->ds[i].name, 0), 0))
289 if (NULL == hv_store (source, "type", 4, newSViv (ds->ds[i].type), 0))
292 if (! isnan (ds->ds[i].min))
293 if (NULL == hv_store (source, "min", 3,
294 newSVnv (ds->ds[i].min), 0))
297 if (! isnan (ds->ds[i].max))
298 if (NULL == hv_store (source, "max", 3,
299 newSVnv (ds->ds[i].max), 0))
302 if (NULL == av_store (array, i, newRV_noinc ((SV *)source)))
306 } /* static int data_set2av (data_set_t *, AV *) */
308 static int value_list2hv (pTHX_ value_list_t *vl, data_set_t *ds, HV *hash)
315 if ((NULL == vl) || (NULL == ds) || (NULL == hash))
318 len = vl->values_len;
320 if (ds->ds_num < len) {
321 log_warn ("value2av: Value length exceeds data set length.");
326 av_extend (values, len - 1);
328 for (i = 0; i < len; ++i) {
331 if (DS_TYPE_COUNTER == ds->ds[i].type)
332 val = newSViv (vl->values[i].counter);
334 val = newSVnv (vl->values[i].gauge);
336 if (NULL == av_store (values, i, val)) {
342 if (NULL == hv_store (hash, "values", 6, newRV_noinc ((SV *)values), 0))
346 if (NULL == hv_store (hash, "time", 4, newSViv (vl->time), 0))
349 if ('\0' != vl->host[0])
350 if (NULL == hv_store (hash, "host", 4, newSVpv (vl->host, 0), 0))
353 if ('\0' != vl->plugin[0])
354 if (NULL == hv_store (hash, "plugin", 6, newSVpv (vl->plugin, 0), 0))
357 if ('\0' != vl->plugin_instance[0])
358 if (NULL == hv_store (hash, "plugin_instance", 15,
359 newSVpv (vl->plugin_instance, 0), 0))
362 if ('\0' != vl->type_instance[0])
363 if (NULL == hv_store (hash, "type_instance", 13,
364 newSVpv (vl->type_instance, 0), 0))
367 } /* static int value2av (value_list_t *, data_set_t *, HV *) */
370 * Internal functions.
373 static char *get_module_name (char *buf, size_t buf_len, const char *module) {
375 if (base_name[0] == '\0')
376 status = snprintf (buf, buf_len, "%s", module);
378 status = snprintf (buf, buf_len, "%s::%s", base_name, module);
379 if ((status < 0) || (status >= buf_len))
381 buf[buf_len - 1] = '\0';
383 } /* char *get_module_name */
386 * Add a plugin's data set definition.
388 static int pplugin_register_data_set (pTHX_ char *name, AV *dataset)
393 data_source_t *ds = NULL;
394 data_set_t *set = NULL;
396 if ((NULL == name) || (NULL == dataset))
399 len = av_len (dataset);
404 ds = (data_source_t *)smalloc ((len + 1) * sizeof (data_source_t));
405 set = (data_set_t *)smalloc (sizeof (data_set_t));
407 for (i = 0; i <= len; ++i) {
408 SV **elem = av_fetch (dataset, i, 0);
413 if (! (SvROK (*elem) && (SVt_PVHV == SvTYPE (SvRV (*elem))))) {
414 log_err ("pplugin_register_data_set: Invalid data source.");
418 if (-1 == hv2data_source (aTHX_ (HV *)SvRV (*elem), &ds[i]))
421 log_debug ("pplugin_register_data_set: "
422 "DS.name = \"%s\", DS.type = %i, DS.min = %f, DS.max = %f",
423 ds[i].name, ds[i].type, ds[i].min, ds[i].max);
426 strncpy (set->type, name, DATA_MAX_NAME_LEN);
427 set->type[DATA_MAX_NAME_LEN - 1] = '\0';
429 set->ds_num = len + 1;
431 return plugin_register_data_set (set);
432 } /* static int pplugin_register_data_set (char *, SV *) */
435 * Remove a plugin's data set definition.
437 static int pplugin_unregister_data_set (char *name)
441 return plugin_unregister_data_set (name);
442 } /* static int pplugin_unregister_data_set (char *) */
445 * Submit the values to the write functions.
449 * values => [ @values ],
453 * plugin_instance => $pinstance,
454 * type_instance => $tinstance,
457 static int pplugin_dispatch_values (pTHX_ char *name, HV *values)
459 value_list_t list = VALUE_LIST_INIT;
466 if ((NULL == name) || (NULL == values))
469 if ((NULL == (tmp = hv_fetch (values, "values", 6, 0)))
470 || (! (SvROK (*tmp) && (SVt_PVAV == SvTYPE (SvRV (*tmp)))))) {
471 log_err ("pplugin_dispatch_values: No valid values given.");
476 AV *array = (AV *)SvRV (*tmp);
477 int len = av_len (array) + 1;
482 val = (value_t *)smalloc (len * sizeof (value_t));
484 list.values_len = av2value (aTHX_ name, (AV *)SvRV (*tmp), val, len);
487 if (-1 == list.values_len) {
493 if (NULL != (tmp = hv_fetch (values, "time", 4, 0))) {
494 list.time = (time_t)SvIV (*tmp);
497 list.time = time (NULL);
500 if (NULL != (tmp = hv_fetch (values, "host", 4, 0))) {
501 strncpy (list.host, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
502 list.host[DATA_MAX_NAME_LEN - 1] = '\0';
505 strcpy (list.host, hostname_g);
508 if (NULL != (tmp = hv_fetch (values, "plugin", 6, 0))) {
509 strncpy (list.plugin, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
510 list.plugin[DATA_MAX_NAME_LEN - 1] = '\0';
513 if (NULL != (tmp = hv_fetch (values,
514 "plugin_instance", 15, 0))) {
515 strncpy (list.plugin_instance, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
516 list.plugin_instance[DATA_MAX_NAME_LEN - 1] = '\0';
519 if (NULL != (tmp = hv_fetch (values, "type_instance", 13, 0))) {
520 strncpy (list.type_instance, SvPV_nolen (*tmp), DATA_MAX_NAME_LEN);
521 list.type_instance[DATA_MAX_NAME_LEN - 1] = '\0';
524 ret = plugin_dispatch_values (name, &list);
528 } /* static int pplugin_dispatch_values (char *, HV *) */
531 * Call all working functions of the given type.
533 static int pplugin_call_all (pTHX_ int type, ...)
542 if ((type < 0) || (type >= PLUGIN_TYPES))
552 XPUSHs (sv_2mortal (newSViv ((IV)type)));
554 if (PLUGIN_WRITE == type) {
556 * $_[0] = $plugin_type;
571 * values => [ $v1, ... ],
575 * plugin_instance => $instance,
576 * type_instance => $type_instance
585 ds = va_arg (ap, data_set_t *);
586 vl = va_arg (ap, value_list_t *);
588 if (-1 == data_set2av (aTHX_ ds, pds))
591 if (-1 == value_list2hv (aTHX_ vl, ds, pvl))
594 XPUSHs (sv_2mortal (newSVpv (ds->type, 0)));
595 XPUSHs (sv_2mortal (newRV_noinc ((SV *)pds)));
596 XPUSHs (sv_2mortal (newRV_noinc ((SV *)pvl)));
598 else if (PLUGIN_LOG == type) {
604 XPUSHs (sv_2mortal (newSViv (va_arg (ap, int))));
605 XPUSHs (sv_2mortal (newSVpv (va_arg (ap, char *), 0)));
610 retvals = call_pv ("Collectd::plugin_call_all", G_SCALAR);
625 } /* static int pplugin_call_all (int, ...) */
632 * Collectd::plugin_register_data_set (type, dataset).
635 * type of the dataset
638 * dataset to be registered
640 static XS (Collectd_plugin_register_ds)
648 log_err ("Usage: Collectd::plugin_register_data_set(type, dataset)");
652 log_debug ("Collectd::plugin_register_data_set: "
653 "type = \"%s\", dataset = \"%s\"",
654 SvPV_nolen (ST (0)), SvPV_nolen (ST (1)));
658 if (SvROK (data) && (SVt_PVAV == SvTYPE (SvRV (data)))) {
659 ret = pplugin_register_data_set (aTHX_ SvPV_nolen (ST (0)),
663 log_err ("Collectd::plugin_register_data_set: Invalid data.");
671 } /* static XS (Collectd_plugin_register_ds) */
674 * Collectd::plugin_unregister_data_set (type).
677 * type of the dataset
679 static XS (Collectd_plugin_unregister_ds)
684 log_err ("Usage: Collectd::plugin_unregister_data_set(type)");
688 log_debug ("Collectd::plugin_unregister_data_set: type = \"%s\"",
689 SvPV_nolen (ST (0)));
691 if (0 == pplugin_unregister_data_set (SvPV_nolen (ST (1))))
695 } /* static XS (Collectd_plugin_register_ds) */
698 * Collectd::plugin_dispatch_values (name, values).
704 * value list to submit
706 static XS (Collectd_plugin_dispatch_values)
715 log_err ("Usage: Collectd::plugin_dispatch_values(name, values)");
719 log_debug ("Collectd::plugin_dispatch_values: "
720 "name = \"%s\", values=\"%s\"",
721 SvPV_nolen (ST (0)), SvPV_nolen (ST (1)));
725 if (! (SvROK (values) && (SVt_PVHV == SvTYPE (SvRV (values))))) {
726 log_err ("Collectd::plugin_dispatch_values: Invalid values.");
730 if ((NULL == ST (0)) || (NULL == values))
733 ret = pplugin_dispatch_values (aTHX_ SvPV_nolen (ST (0)),
734 (HV *)SvRV (values));
740 } /* static XS (Collectd_plugin_dispatch_values) */
743 * Collectd::plugin_log (level, message).
746 * log level (LOG_DEBUG, ... LOG_ERR)
751 static XS (Collectd_plugin_log)
756 log_err ("Usage: Collectd::plugin_log(level, message)");
760 plugin_log (SvIV (ST (0)), SvPV_nolen (ST (1)));
762 } /* static XS (Collectd_plugin_log) */
765 * Collectd::call_by_name (...).
767 * Call a Perl sub identified by its name passed through $Collectd::cb_name.
769 static XS (Collectd_call_by_name)
774 if (NULL == (tmp = get_sv ("Collectd::cb_name", 0))) {
775 sv_setpv (get_sv ("@", 1), "cb_name has not been set");
780 name = SvPV_nolen (tmp);
782 if (NULL == get_cv (name, 0)) {
783 sv_setpvf (get_sv ("@", 1), "unknown callback \"%s\"", name);
788 /* simply pass on the subroutine call without touching the stack,
789 * thus leaving any arguments and return values in place */
791 } /* static XS (Collectd_call_by_name) */
794 * collectd's perl interpreter based thread implementation.
796 * This has been inspired by Perl's ithreads introduced in version 5.6.0.
799 /* must be called with perl_threads->mutex locked */
800 static void c_ithread_destroy (c_ithread_t *ithread)
802 dTHXa (ithread->interp);
804 assert (NULL != perl_threads);
806 PERL_SET_CONTEXT (aTHX);
807 log_debug ("Shutting down Perl interpreter %p...", aTHX);
812 --perl_threads->number_of_threads;
813 #endif /* COLLECT_DEBUG */
815 perl_destruct (aTHX);
818 if (NULL == ithread->prev)
819 perl_threads->head = ithread->next;
821 ithread->prev->next = ithread->next;
823 if (NULL == ithread->next)
824 perl_threads->tail = ithread->prev;
826 ithread->next->prev = ithread->prev;
830 } /* static void c_ithread_destroy (c_ithread_t *) */
832 static void c_ithread_destructor (void *arg)
834 c_ithread_t *ithread = (c_ithread_t *)arg;
835 c_ithread_t *t = NULL;
837 if (NULL == perl_threads)
840 pthread_mutex_lock (&perl_threads->mutex);
842 for (t = perl_threads->head; NULL != t; t = t->next)
846 /* the ithread no longer exists */
850 c_ithread_destroy (ithread);
852 pthread_mutex_unlock (&perl_threads->mutex);
854 } /* static void c_ithread_destructor (void *) */
856 /* must be called with perl_threads->mutex locked */
857 static c_ithread_t *c_ithread_create (PerlInterpreter *base)
859 c_ithread_t *t = NULL;
862 assert (NULL != perl_threads);
864 t = (c_ithread_t *)smalloc (sizeof (c_ithread_t));
865 memset (t, 0, sizeof (c_ithread_t));
867 t->interp = (NULL == base)
869 : perl_clone (base, CLONEf_KEEP_PTR_TABLE);
880 ++perl_threads->number_of_threads;
881 #endif /* COLLECT_DEBUG */
885 if (NULL == perl_threads->tail) {
886 perl_threads->head = t;
890 perl_threads->tail->next = t;
891 t->prev = perl_threads->tail;
894 perl_threads->tail = t;
896 pthread_setspecific (perl_thr_key, (const void *)t);
898 } /* static c_ithread_t *c_ithread_create (PerlInterpreter *) */
901 * Interface to collectd.
904 static int perl_init (void)
908 if (NULL == perl_threads)
912 c_ithread_t *t = NULL;
914 pthread_mutex_lock (&perl_threads->mutex);
915 t = c_ithread_create (perl_threads->head->interp);
916 pthread_mutex_unlock (&perl_threads->mutex);
921 log_debug ("perl_init: c_ithread: interp = %p (active threads: %i)",
922 aTHX, perl_threads->number_of_threads);
923 return pplugin_call_all (aTHX_ PLUGIN_INIT);
924 } /* static int perl_init (void) */
926 static int perl_read (void)
930 if (NULL == perl_threads)
934 c_ithread_t *t = NULL;
936 pthread_mutex_lock (&perl_threads->mutex);
937 t = c_ithread_create (perl_threads->head->interp);
938 pthread_mutex_unlock (&perl_threads->mutex);
943 log_debug ("perl_read: c_ithread: interp = %p (active threads: %i)",
944 aTHX, perl_threads->number_of_threads);
945 return pplugin_call_all (aTHX_ PLUGIN_READ);
946 } /* static int perl_read (void) */
948 static int perl_write (const data_set_t *ds, const value_list_t *vl)
952 if (NULL == perl_threads)
956 c_ithread_t *t = NULL;
958 pthread_mutex_lock (&perl_threads->mutex);
959 t = c_ithread_create (perl_threads->head->interp);
960 pthread_mutex_unlock (&perl_threads->mutex);
965 log_debug ("perl_write: c_ithread: interp = %p (active threads: %i)",
966 aTHX, perl_threads->number_of_threads);
967 return pplugin_call_all (aTHX_ PLUGIN_WRITE, ds, vl);
968 } /* static int perl_write (const data_set_t *, const value_list_t *) */
970 static void perl_log (int level, const char *msg)
974 if (NULL == perl_threads)
978 c_ithread_t *t = NULL;
980 pthread_mutex_lock (&perl_threads->mutex);
981 t = c_ithread_create (perl_threads->head->interp);
982 pthread_mutex_unlock (&perl_threads->mutex);
987 pplugin_call_all (aTHX_ PLUGIN_LOG, level, msg);
989 } /* static void perl_log (int, const char *) */
991 static int perl_shutdown (void)
993 c_ithread_t *t = NULL;
999 plugin_unregister_complex_config ("perl");
1001 if (NULL == perl_threads)
1005 c_ithread_t *t = NULL;
1007 pthread_mutex_lock (&perl_threads->mutex);
1008 t = c_ithread_create (perl_threads->head->interp);
1009 pthread_mutex_unlock (&perl_threads->mutex);
1014 log_debug ("perl_shutdown: c_ithread: interp = %p (active threads: %i)",
1015 aTHX, perl_threads->number_of_threads);
1017 plugin_unregister_log ("perl");
1018 plugin_unregister_init ("perl");
1019 plugin_unregister_read ("perl");
1020 plugin_unregister_write ("perl");
1022 ret = pplugin_call_all (aTHX_ PLUGIN_SHUTDOWN);
1024 pthread_mutex_lock (&perl_threads->mutex);
1025 t = perl_threads->tail;
1028 c_ithread_t *thr = t;
1030 /* the pointer has to be advanced before destroying
1031 * the thread as this will free the memory */
1034 c_ithread_destroy (thr);
1037 pthread_mutex_unlock (&perl_threads->mutex);
1038 pthread_mutex_destroy (&perl_threads->mutex);
1040 sfree (perl_threads);
1042 pthread_key_delete (perl_thr_key);
1046 plugin_unregister_shutdown ("perl");
1048 } /* static void perl_shutdown (void) */
1051 * Access functions for global variables.
1053 * These functions implement the "magic" used to access
1054 * the global variables from Perl.
1057 static int g_pv_get (pTHX_ SV *var, MAGIC *mg)
1059 char *pv = mg->mg_ptr;
1062 } /* static int g_pv_get (pTHX_ SV *, MAGIC *) */
1064 static int g_pv_set (pTHX_ SV *var, MAGIC *mg)
1066 char *pv = mg->mg_ptr;
1067 strncpy (pv, SvPV_nolen (var), DATA_MAX_NAME_LEN);
1068 pv[DATA_MAX_NAME_LEN - 1] = '\0';
1070 } /* static int g_pv_set (pTHX_ SV *, MAGIC *) */
1072 static int g_iv_get (pTHX_ SV *var, MAGIC *mg)
1074 int *iv = (int *)mg->mg_ptr;
1075 sv_setiv (var, *iv);
1077 } /* static int g_iv_get (pTHX_ SV *, MAGIC *) */
1079 static int g_iv_set (pTHX_ SV *var, MAGIC *mg)
1081 int *iv = (int *)mg->mg_ptr;
1082 *iv = (int)SvIV (var);
1084 } /* static int g_iv_set (pTHX_ SV *, MAGIC *) */
1086 static MGVTBL g_pv_vtbl = { g_pv_get, g_pv_set, NULL, NULL, NULL };
1087 static MGVTBL g_iv_vtbl = { g_iv_get, g_iv_set, NULL, NULL, NULL };
1089 /* bootstrap the Collectd module */
1090 static void xs_init (pTHX)
1094 char *file = __FILE__;
1100 /* enable usage of Perl modules using shared libraries */
1101 newXS ("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
1104 for (i = 0; NULL != api[i].f; ++i)
1105 newXS (api[i].name, api[i].f, file);
1107 stash = gv_stashpv ("Collectd", 1);
1109 /* export "constants" */
1110 for (i = 0; '\0' != constants[i].name[0]; ++i)
1111 newCONSTSUB (stash, constants[i].name, newSViv (constants[i].value));
1113 /* export global variables
1114 * by adding "magic" to the SV's representing the globale variables
1115 * perl is able to automagically call the get/set function when
1116 * accessing any such variable (this is basically the same as using
1118 /* global strings */
1119 for (i = 0; '\0' != g_strings[i].name[0]; ++i) {
1120 tmp = get_sv (g_strings[i].name, 1);
1121 sv_magicext (tmp, NULL, PERL_MAGIC_ext, &g_pv_vtbl,
1122 g_strings[i].var, 0);
1125 /* global integers */
1126 for (i = 0; '\0' != g_integers[i].name[0]; ++i) {
1127 tmp = get_sv (g_integers[i].name, 1);
1128 sv_magicext (tmp, NULL, PERL_MAGIC_ext, &g_iv_vtbl,
1129 (char *)g_integers[i].var, 0);
1132 } /* static void xs_init (pTHX) */
1134 /* Initialize the global Perl interpreter. */
1135 static int init_pi (int argc, char **argv)
1139 if (NULL != perl_threads)
1142 log_info ("Initializing Perl interpreter...");
1147 for (i = 0; i < argc; ++i)
1148 log_debug ("argv[%i] = \"%s\"", i, argv[i]);
1150 #endif /* COLLECT_DEBUG */
1152 if (0 != pthread_key_create (&perl_thr_key, c_ithread_destructor)) {
1153 log_err ("init_pi: pthread_key_create failed");
1155 /* this must not happen - cowardly giving up if it does */
1159 PERL_SYS_INIT3 (&argc, &argv, &environ);
1161 perl_threads = (c_ithread_list_t *)smalloc (sizeof (c_ithread_list_t));
1162 memset (perl_threads, 0, sizeof (c_ithread_list_t));
1164 pthread_mutex_init (&perl_threads->mutex, NULL);
1165 /* locking the mutex should not be necessary at this point
1166 * but let's just do it for the sake of completeness */
1167 pthread_mutex_lock (&perl_threads->mutex);
1169 perl_threads->head = c_ithread_create (NULL);
1170 perl_threads->tail = perl_threads->head;
1172 if (NULL == (perl_threads->head->interp = perl_alloc ())) {
1173 log_err ("init_pi: Not enough memory.");
1177 aTHX = perl_threads->head->interp;
1178 pthread_mutex_unlock (&perl_threads->mutex);
1180 perl_construct (aTHX);
1182 PL_exit_flags |= PERL_EXIT_DESTRUCT_END;
1184 if (0 != perl_parse (aTHX_ xs_init, argc, argv, NULL)) {
1185 log_err ("init_pi: Unable to bootstrap Collectd.");
1189 /* Set $0 to "collectd" because perl_parse() has to set it to "-e". */
1190 sv_setpv (get_sv ("0", 0), "collectd");
1194 plugin_register_log ("perl", perl_log);
1195 plugin_register_init ("perl", perl_init);
1197 plugin_register_read ("perl", perl_read);
1199 plugin_register_write ("perl", perl_write);
1200 plugin_register_shutdown ("perl", perl_shutdown);
1202 } /* static int init_pi (const char **, const int) */
1205 * LoadPlugin "<Plugin>"
1207 static int perl_config_loadplugin (pTHX_ oconfig_item_t *ci)
1209 char module_name[DATA_MAX_NAME_LEN];
1213 if ((0 != ci->children_num) || (1 != ci->values_num)
1214 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1215 log_err ("LoadPlugin expects a single string argument.");
1219 value = ci->values[0].value.string;
1221 if (NULL == get_module_name (module_name, sizeof (module_name), value)) {
1222 log_err ("Invalid module name %s", value);
1226 init_pi (perl_argc, perl_argv);
1227 assert (NULL != perl_threads);
1228 assert (NULL != perl_threads->head);
1230 aTHX = perl_threads->head->interp;
1232 log_debug ("perl_config: loading perl plugin \"%s\"", value);
1233 load_module (PERL_LOADMOD_NOIMPORT,
1234 newSVpv (module_name, strlen (module_name)), Nullsv);
1236 } /* static int perl_config_loadplugin (oconfig_item_it *) */
1241 static int perl_config_basename (pTHX_ oconfig_item_t *ci)
1245 if ((0 != ci->children_num) || (1 != ci->values_num)
1246 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1247 log_err ("BaseName expects a single string argument.");
1251 value = ci->values[0].value.string;
1253 log_debug ("perl_config: Setting plugin basename to \"%s\"", value);
1254 strncpy (base_name, value, sizeof (base_name));
1255 base_name[sizeof (base_name) - 1] = '\0';
1257 } /* static int perl_config_basename (oconfig_item_it *) */
1260 * EnableDebugger "<Package>"|""
1262 static int perl_config_enabledebugger (pTHX_ oconfig_item_t *ci)
1266 if ((0 != ci->children_num) || (1 != ci->values_num)
1267 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1268 log_err ("EnableDebugger expects a single string argument.");
1272 value = ci->values[0].value.string;
1274 perl_argv = (char **)realloc (perl_argv,
1275 (++perl_argc + 1) * sizeof (char *));
1277 if (NULL == perl_argv) {
1278 log_err ("perl_config: Not enough memory.");
1282 if ('\0' == value[0]) {
1283 perl_argv[perl_argc - 1] = "-d";
1286 perl_argv[perl_argc - 1] = (char *)smalloc (strlen (value) + 4);
1287 sstrncpy (perl_argv[perl_argc - 1], "-d:", 4);
1288 sstrncpy (perl_argv[perl_argc - 1] + 3, value, strlen (value) + 1);
1291 perl_argv[perl_argc] = NULL;
1293 } /* static int perl_config_enabledebugger (oconfig_item_it *) */
1296 * IncludeDir "<Dir>"
1298 static int perl_config_includedir (pTHX_ oconfig_item_t *ci)
1302 if ((0 != ci->children_num) || (1 != ci->values_num)
1303 || (OCONFIG_TYPE_STRING != ci->values[0].type)) {
1304 log_err ("IncludeDir expects a single string argument.");
1308 value = ci->values[0].value.string;
1311 perl_argv = (char **)realloc (perl_argv,
1312 (++perl_argc + 1) * sizeof (char *));
1314 if (NULL == perl_argv) {
1315 log_err ("perl_config: Not enough memory.");
1319 perl_argv[perl_argc - 1] = (char *)smalloc (strlen (value) + 3);
1320 sstrncpy(perl_argv[perl_argc - 1], "-I", 3);
1321 sstrncpy(perl_argv[perl_argc - 1] + 2, value, strlen (value) + 1);
1323 perl_argv[perl_argc] = NULL;
1326 /* prepend the directory to @INC */
1327 av_unshift (GvAVn (PL_incgv), 1);
1328 av_store (GvAVn (PL_incgv), 0, newSVpv (value, strlen (value)));
1331 } /* static int perl_config_includedir (oconfig_item_it *) */
1333 static int perl_config (oconfig_item_t *ci)
1339 /* dTHX does not get any valid values in case Perl
1340 * has not been initialized */
1341 if (NULL == perl_threads)
1344 for (i = 0; i < ci->children_num; ++i) {
1345 oconfig_item_t *c = ci->children + i;
1347 if (0 == strcasecmp (c->key, "LoadPlugin"))
1348 perl_config_loadplugin (aTHX_ c);
1349 else if (0 == strcasecmp (c->key, "BaseName"))
1350 perl_config_basename (aTHX_ c);
1351 else if (0 == strcasecmp (c->key, "EnableDebugger"))
1352 perl_config_enabledebugger (aTHX_ c);
1353 else if (0 == strcasecmp (c->key, "IncludeDir"))
1354 perl_config_includedir (aTHX_ c);
1356 log_warn ("Ignoring unknown config key \"%s\".", c->key);
1359 } /* static int perl_config (oconfig_item_t *) */
1361 void module_register (void)
1364 perl_argv = (char **)smalloc ((perl_argc + 1) * sizeof (char *));
1366 /* default options for the Perl interpreter */
1368 perl_argv[1] = "-MCollectd";
1369 perl_argv[2] = "-e";
1371 perl_argv[4] = NULL;
1373 plugin_register_complex_config ("perl", perl_config);
1375 } /* void module_register (void) */
1377 /* vim: set sw=4 ts=4 tw=78 noexpandtab : */