2 * collectd - src/filter_chain.h
3 * Copyright (C) 2008 Florian octo Forster
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 * Florian octo Forster <octo at verplant.org>
23 * First tell the compiler to stick to the C99 and POSIX standards as close as
26 #ifndef __STRICT_ANSI__ /* {{{ */
27 # define __STRICT_ANSI__
30 #ifndef _ISOC99_SOURCE
31 # define _ISOC99_SOURCE
34 #ifdef _POSIX_C_SOURCE
35 # undef _POSIX_C_SOURCE
37 #define _POSIX_C_SOURCE 200112L
40 /* Single UNIX needed for strdup. */
44 #define _XOPEN_SOURCE 500
61 #include "configfile.h"
64 #include "filter_chain.h"
69 /* List of matches, used in fc_rule_t and for the global `match_list_head'
72 typedef struct fc_match_s fc_match_t; /* {{{ */
75 char name[DATA_MAX_NAME_LEN];
81 /* List of targets, used in fc_rule_t and for the global `target_list_head'
84 typedef struct fc_target_s fc_target_t; /* {{{ */
87 char name[DATA_MAX_NAME_LEN];
93 /* List of rules, used in fc_chain_t */
95 typedef struct fc_fule_s fc_rule_t; /* {{{ */
98 char name[DATA_MAX_NAME_LEN];
100 fc_target_t *targets;
104 /* List of chains, used for `chain_list_head' */
106 typedef struct fc_chain_s fc_chain_t; /* {{{ */
109 char name[DATA_MAX_NAME_LEN];
111 fc_target_t *targets;
118 static fc_match_t *match_list_head;
119 static fc_target_t *target_list_head;
120 static fc_chain_t *chain_list_head;
125 static void fc_free_matches (fc_match_t *m) /* {{{ */
130 if (m->proc.destroy != NULL)
131 (*m->proc.destroy) (&m->user_data);
132 else if (m->user_data != NULL)
134 ERROR ("Filter sybsystem: fc_free_matches: There is user data, but no "
135 "destroy functions has been specified. "
136 "Memory will probably be lost!");
140 fc_free_matches (m->next);
143 } /* }}} void fc_free_matches */
145 static void fc_free_targets (fc_target_t *t) /* {{{ */
150 if (t->proc.destroy != NULL)
151 (*t->proc.destroy) (&t->user_data);
152 else if (t->user_data != NULL)
154 ERROR ("Filter sybsystem: fc_free_targets: There is user data, but no "
155 "destroy functions has been specified. "
156 "Memory will probably be lost!");
160 fc_free_targets (t->next);
163 } /* }}} void fc_free_targets */
165 static void fc_free_rules (fc_rule_t *r) /* {{{ */
170 fc_free_matches (r->matches);
171 fc_free_targets (r->targets);
174 fc_free_rules (r->next);
177 } /* }}} void fc_free_rules */
179 static void fc_free_chains (fc_chain_t *c) /* {{{ */
184 fc_free_rules (c->rules);
185 fc_free_targets (c->targets);
188 fc_free_chains (c->next);
191 } /* }}} void fc_free_chains */
193 static char *fc_strdup (const char *orig) /* {{{ */
201 sz = strlen (orig) + 1;
202 dest = (char *) malloc (sz);
206 memcpy (dest, orig, sz);
209 } /* }}} char *fc_strdup */
214 * The configuration looks somewhat like this:
220 * Type "^mysql_command$"
221 * TypeInstance "^show_"
232 static int fc_config_add_match (fc_match_t **matches_head, /* {{{ */
239 if ((ci->values_num != 1)
240 || (ci->values[0].type != OCONFIG_TYPE_STRING))
242 WARNING ("Filter subsystem: `Match' blocks require "
243 "exactly one string argument.");
247 ptr = match_list_head;
250 if (strcasecmp (ptr->name, ci->values[0].value.string) == 0)
257 WARNING ("Filter subsystem: Cannot find a \"%s\" match. "
258 "Did you load the appropriate plugin?",
259 ci->values[0].value.string);
263 m = (fc_match_t *) malloc (sizeof (*m));
266 ERROR ("fc_config_add_match: malloc failed.");
269 memset (m, 0, sizeof (*m));
271 sstrncpy (m->name, ptr->name, sizeof (m->name));
272 memcpy (&m->proc, &ptr->proc, sizeof (m->proc));
273 assert (m->proc.create != NULL);
277 status = (*m->proc.create) (ci, &m->user_data);
280 WARNING ("Filter subsystem: Failed to create a %s match.",
286 if (*matches_head != NULL)
289 while (ptr->next != NULL)
300 } /* }}} int fc_config_add_match */
302 static int fc_config_add_target (fc_target_t **targets_head, /* {{{ */
309 if ((ci->values_num != 1)
310 || (ci->values[0].type != OCONFIG_TYPE_STRING))
312 WARNING ("Filter subsystem: `Target' blocks require "
313 "exactly one string argument.");
317 ptr = target_list_head;
320 if (strcasecmp (ptr->name, ci->values[0].value.string) == 0)
327 WARNING ("Filter subsystem: Cannot find a \"%s\" target. "
328 "Did you load the appropriate plugin?",
329 ci->values[0].value.string);
333 t = (fc_target_t *) malloc (sizeof (*t));
336 ERROR ("fc_config_add_match: malloc failed.");
339 memset (t, 0, sizeof (*t));
341 sstrncpy (t->name, ptr->name, sizeof (t->name));
342 memcpy (&t->proc, &ptr->proc, sizeof (t->proc));
343 assert (t->proc.create != NULL);
347 status = (*t->proc.create) (ci, &t->user_data);
350 WARNING ("Filter subsystem: Failed to create a %s match.",
356 if (*targets_head != NULL)
359 while (ptr->next != NULL)
370 } /* }}} int fc_config_add_target */
372 static int fc_config_add_rule (fc_chain_t *chain, /* {{{ */
376 char rule_name[2*DATA_MAX_NAME_LEN] = "Unnamed rule";
380 if (ci->values_num > 1)
382 WARNING ("Filter subsystem: `Rule' blocks have at most one argument.");
385 else if ((ci->values_num == 1)
386 && (ci->values[0].type != OCONFIG_TYPE_STRING))
388 WARNING ("Filter subsystem: `Rule' blocks expect one string argument "
389 "or no argument at all.");
393 rule = (fc_rule_t *) malloc (sizeof (*rule));
396 ERROR ("fc_config_add_rule: malloc failed.");
399 memset (rule, 0, sizeof (*rule));
402 if (ci->values_num == 1)
404 sstrncpy (rule->name, ci->values[0].value.string, sizeof (rule->name));
405 ssnprintf (rule_name, sizeof (rule_name), "Rule \"%s\"",
406 ci->values[0].value.string);
409 for (i = 0; i < ci->children_num; i++)
411 oconfig_item_t *option = ci->children + i;
414 if (strcasecmp ("Match", option->key) == 0)
415 status = fc_config_add_match (&rule->matches, option);
416 else if (strcasecmp ("Target", option->key) == 0)
417 status = fc_config_add_target (&rule->targets, option);
420 WARNING ("Filter subsystem: %s: Option `%s' not allowed "
421 "inside a <Rule> block.", rule_name, option->key);
427 } /* for (ci->children) */
429 /* Additional sanity checking. */
432 if (rule->targets == NULL)
434 WARNING ("Filter subsystem: %s: No target has been specified.",
441 } /* while (status == 0) */
445 fc_free_rules (rule);
449 if (chain->rules != NULL)
454 while (ptr->next != NULL)
465 } /* }}} int fc_config_add_rule */
467 static int fc_config_add_chain (const oconfig_item_t *ci) /* {{{ */
473 if ((ci->values_num != 1)
474 || (ci->values[0].type != OCONFIG_TYPE_STRING))
476 WARNING ("Filter subsystem: <Chain> blocks require exactly one "
481 chain = (fc_chain_t *) malloc (sizeof (*chain));
484 ERROR ("fc_config_add_chain: malloc failed.");
487 memset (chain, 0, sizeof (*chain));
488 sstrncpy (chain->name, ci->values[0].value.string, sizeof (chain->name));
490 chain->targets = NULL;
493 for (i = 0; i < ci->children_num; i++)
495 oconfig_item_t *option = ci->children + i;
498 if (strcasecmp ("Rule", option->key) == 0)
499 status = fc_config_add_rule (chain, option);
500 else if (strcasecmp ("Target", option->key) == 0)
501 status = fc_config_add_target (&chain->targets, option);
504 WARNING ("Filter subsystem: Chain %s: Option `%s' not allowed "
505 "inside a <Chain> block.", chain->name, option->key);
511 } /* for (ci->children) */
513 /* Additional sanity checking. */
516 if (chain->targets == NULL)
518 WARNING ("Filter subsystem: Chain %s: No default target has been "
519 "specified. Please make sure that there is a <Target> block within "
520 "the <Chain> block!", chain->name);
526 } /* while (status == 0) */
530 fc_free_chains (chain);
534 if (chain_list_head != NULL)
538 ptr = chain_list_head;
539 while (ptr->next != NULL)
546 chain_list_head = chain;
550 } /* }}} int fc_config_add_chain */
552 int fc_process_chain (const data_set_t *ds, value_list_t *vl, /* {{{ */
562 status = FC_ACTION_CONTINUE;
564 for (rule = chain->rules; rule != NULL; rule = rule->next)
568 /* N. B.: rule->matches may be NULL. */
569 for (match = rule->matches; match != NULL; match = match->next)
571 status = (*match->proc.match) (ds, vl, /* meta = */ NULL,
575 WARNING ("fc_process: A match failed.");
578 else if (status != FC_MATCH_MATCHES)
582 /* for-loop has been aborted: Either error or no match. */
586 for (target = rule->targets; target != NULL; target = target->next)
588 /* If we get here, all matches have matched the value. Execute the target. */
589 status = (*target->proc.invoke) (ds, vl, /* meta = */ NULL,
593 WARNING ("fc_process: A target failed.");
596 else if (status == FC_ACTION_CONTINUE)
598 else if (status == FC_ACTION_STOP)
602 WARNING ("fc_process: Unknown target return value: %i", status);
606 if (status == FC_ACTION_STOP)
610 /* for-loop has been aborted: A target returned `FC_ACTION_STOP' */
614 for (target = chain->targets; target != NULL; target = target->next)
616 /* If we get here, all matches have matched the value. Execute the target. */
617 status = (*target->proc.invoke) (ds, vl, /* meta = */ NULL,
621 WARNING ("fc_process: The default target failed.");
626 } /* }}} int fc_process_chain */
629 * Built-in target "jump"
631 * Prefix `bit' like `_b_uilt-_i_n _t_arget'
633 static int fc_bit_jump_create (const oconfig_item_t *ci, /* {{{ */
636 oconfig_item_t *ci_chain;
638 if (ci->children_num != 1)
640 ERROR ("Filter subsystem: The built-in target `jump' needs exactly "
641 "one `Chain' argument!");
645 ci_chain = ci->children;
646 if (strcasecmp ("Chain", ci_chain->key) != 0)
648 ERROR ("Filter subsystem: The built-in target `jump' does not "
649 "support the configuration option `%s'.",
654 if ((ci_chain->values_num != 1)
655 || (ci_chain->values[0].type != OCONFIG_TYPE_STRING))
657 ERROR ("Filter subsystem: Built-in target `jump': The `Chain' option "
658 "needs exactly one string argument.");
662 *user_data = fc_strdup (ci_chain->values[0].value.string);
663 if (*user_data == NULL)
665 ERROR ("fc_bit_jump_create: fc_strdup failed.");
670 } /* }}} int fc_bit_jump_create */
672 static int fc_bit_jump_destroy (void **user_data) /* {{{ */
674 if (user_data != NULL)
681 } /* }}} int fc_bit_jump_destroy */
683 static int fc_bit_jump_invoke (const data_set_t *ds, /* {{{ */
684 value_list_t *vl, notification_meta_t **meta, void **user_data)
690 chain_name = *user_data;
692 for (chain = chain_list_head; chain != NULL; chain = chain->next)
693 if (strcasecmp (chain_name, chain->name) == 0)
698 ERROR ("Filter subsystem: Built-in target `jump': There is no chain "
699 "named `%s'.", chain_name);
703 status = fc_process_chain (ds, vl, chain);
707 return (FC_ACTION_CONTINUE);
708 } /* }}} int fc_bit_jump_invoke */
710 static int fc_bit_stop_invoke (const data_set_t *ds, /* {{{ */
711 value_list_t *vl, notification_meta_t **meta, void **user_data)
713 return (FC_ACTION_STOP);
714 } /* }}} int fc_bit_stop_invoke */
716 static int fc_bit_write_create (const oconfig_item_t *ci, /* {{{ */
722 size_t plugin_list_len;
727 for (i = 0; i < ci->children_num; i++)
729 oconfig_item_t *child = ci->children + i;
733 if (strcasecmp ("Plugin", child->key) != 0)
735 ERROR ("Filter subsystem: The built-in target `write' does not "
736 "support the configuration option `%s'.",
741 for (j = 0; j < child->values_num; j++)
743 if (child->values[j].type != OCONFIG_TYPE_STRING)
745 ERROR ("Filter subsystem: Built-in target `write': "
746 "The `Plugin' option accepts only string arguments.");
750 temp = (char **) realloc (plugin_list, (plugin_list_len + 2)
751 * (sizeof (*plugin_list)));
754 ERROR ("fc_bit_write_create: realloc failed.");
759 plugin_list[plugin_list_len] = fc_strdup (child->values[j].value.string);
760 if (plugin_list[plugin_list_len] == NULL)
762 ERROR ("fc_bit_write_create: fc_strdup failed.");
766 plugin_list[plugin_list_len] = NULL;
767 } /* for (j = 0; j < child->values_num; j++) */
768 } /* for (i = 0; i < ci->children_num; i++) */
770 *user_data = plugin_list;
773 } /* }}} int fc_bit_write_create */
775 static int fc_bit_write_destroy (void **user_data) /* {{{ */
780 if ((user_data == NULL) || (*user_data == NULL))
783 plugin_list = *user_data;
785 for (i = 0; plugin_list[i] != NULL; i++)
786 free (plugin_list[i]);
790 } /* }}} int fc_bit_write_destroy */
792 static int fc_bit_write_invoke (const data_set_t *ds, /* {{{ */
793 value_list_t *vl, notification_meta_t **meta, void **user_data)
799 if (user_data != NULL)
800 plugin_list = *user_data;
802 if ((plugin_list == NULL) || (plugin_list[0] == NULL))
804 status = plugin_write (/* plugin = */ NULL, ds, vl);
807 INFO ("Filter subsystem: Built-in target `write': Dispatching value to "
808 "all write plugins failed with status %i.", status);
815 for (i = 0; plugin_list[i] != NULL; i++)
817 status = plugin_write (plugin_list[i], ds, vl);
820 INFO ("Filter subsystem: Built-in target `write': Dispatching value to "
821 "the `%s' plugin failed with status %i.", plugin_list[i], status);
823 } /* for (i = 0; plugin_list[i] != NULL; i++) */
826 return (FC_ACTION_CONTINUE);
827 } /* }}} int fc_bit_write_invoke */
829 static int fc_init_once (void) /* {{{ */
837 memset (&tproc, 0, sizeof (tproc));
838 tproc.create = fc_bit_jump_create;
839 tproc.destroy = fc_bit_jump_destroy;
840 tproc.invoke = fc_bit_jump_invoke;
841 fc_register_target ("jump", tproc);
843 memset (&tproc, 0, sizeof (tproc));
845 tproc.destroy = NULL;
846 tproc.invoke = fc_bit_stop_invoke;
847 fc_register_target ("stop", tproc);
849 memset (&tproc, 0, sizeof (tproc));
850 tproc.create = fc_bit_write_create;
851 tproc.destroy = fc_bit_write_destroy;
852 tproc.invoke = fc_bit_write_invoke;
853 fc_register_target ("write", tproc);
857 } /* }}} int fc_init_once */
862 /* Add a match to list of available matches. */
863 int fc_register_match (const char *name, match_proc_t proc) /* {{{ */
867 m = (fc_match_t *) malloc (sizeof (*m));
870 memset (m, 0, sizeof (*m));
872 sstrncpy (m->name, name, sizeof (m->name));
873 memcpy (&m->proc, &proc, sizeof (m->proc));
876 if (match_list_head == NULL)
884 ptr = match_list_head;
885 while (ptr->next != NULL)
892 } /* }}} int fc_register_match */
894 /* Add a target to list of available targets. */
895 int fc_register_target (const char *name, target_proc_t proc) /* {{{ */
899 t = (fc_target_t *) malloc (sizeof (*t));
902 memset (t, 0, sizeof (*t));
904 sstrncpy (t->name, name, sizeof (t->name));
905 memcpy (&t->proc, &proc, sizeof (t->proc));
908 if (target_list_head == NULL)
910 target_list_head = t;
916 ptr = target_list_head;
917 while (ptr->next != NULL)
924 } /* }}} int fc_register_target */
926 /* Iterate over all rules in the chain and execute all targets for which all
928 int fc_process (const data_set_t *ds, value_list_t *vl) /* {{{ */
932 for (chain = chain_list_head; chain != NULL; chain = chain->next)
933 if (strcasecmp ("Main", chain->name) == 0)
937 return (fc_process_chain (ds, vl, chain));
939 ERROR ("fc_process: TODO: Implement default behavior!");
942 } /* }}} int fc_process */
944 int fc_configure (const oconfig_item_t *ci) /* {{{ */
951 if (strcasecmp ("Chain", ci->key) == 0)
952 return (fc_config_add_chain (ci));
954 WARNING ("Filter subsystem: Unknown top level config option `%s'.",
958 } /* }}} int fc_configure */
960 /* vim: set sw=2 sts=2 et fdm=marker : */