cec3f1b39a5f60c40505b7461e01ddb237814bfa
[asterisk/asterisk.git] / main / sorcery.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2012 - 2013, Digium, Inc.
5  *
6  * Joshua Colp <jcolp@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18
19 /*! \file
20  *
21  * \brief Sorcery Data Access Layer API
22  *
23  * \author Joshua Colp <jcolp@digium.com>
24  */
25
26 /*** MODULEINFO
27         <support_level>core</support_level>
28  ***/
29
30 #include "asterisk.h"
31
32 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
33
34 #include "asterisk/logger.h"
35 #include "asterisk/sorcery.h"
36 #include "asterisk/astobj2.h"
37 #include "asterisk/format.h"
38 #include "asterisk/format_cap.h"
39 #include "asterisk/strings.h"
40 #include "asterisk/config_options.h"
41 #include "asterisk/netsock2.h"
42 #include "asterisk/module.h"
43 #include "asterisk/taskprocessor.h"
44 #include "asterisk/threadpool.h"
45 #include "asterisk/json.h"
46
47 /* To prevent DEBUG_FD_LEAKS from interfering with things we undef open and close */
48 #undef open
49 #undef close
50
51 /*! \brief Number of buckets for wizards (should be prime for performance reasons) */
52 #define WIZARD_BUCKETS 7
53
54 /*! \brief Number of buckets for types (should be prime for performance reasons) */
55 #define TYPE_BUCKETS 53
56
57 /*! \brief Number of buckets for instances (should be prime for performance reasons) */
58 #define INSTANCE_BUCKETS 17
59
60 /*! \brief Number of buckets for object fields (should be prime for performance reasons) */
61 #define OBJECT_FIELD_BUCKETS 29
62
63 #define NOTIFY_GENERIC_OBSERVERS(container, type, callback, ...) ({ \
64         struct ao2_iterator i = ao2_iterator_init(container, 0); \
65         struct type *observer; \
66         ao2_rdlock(container); \
67         while ((observer = ao2_iterator_next(&i))) { \
68                 if (observer->callbacks->callback) { \
69                         observer->callbacks->callback(__VA_ARGS__); \
70                 } \
71                 ao2_cleanup(observer); \
72         } \
73         ao2_unlock(container); \
74         ao2_iterator_cleanup(&i); \
75 })
76
77 #define NOTIFY_GLOBAL_OBSERVERS(container, callback, ...) \
78         NOTIFY_GENERIC_OBSERVERS(container, sorcery_global_observer, callback, __VA_ARGS__)
79
80 #define NOTIFY_INSTANCE_OBSERVERS(container, callback, ...) \
81         NOTIFY_GENERIC_OBSERVERS(container, sorcery_instance_observer, callback, __VA_ARGS__)
82
83 #define NOTIFY_WIZARD_OBSERVERS(container, callback, ...) \
84         NOTIFY_GENERIC_OBSERVERS(container, sorcery_wizard_observer, callback, __VA_ARGS__)
85
86 /*! \brief Thread pool for observers */
87 static struct ast_threadpool *threadpool;
88
89 /*! \brief Structure for internal sorcery object information */
90 struct ast_sorcery_object {
91         /*! \brief Unique identifier of this object */
92         char *id;
93
94         /*! \brief Type of object */
95         char type[MAX_OBJECT_TYPE];
96
97         /*! \brief Optional object destructor */
98         ao2_destructor_fn destructor;
99
100         /*! \brief Extended object fields */
101         struct ast_variable *extended;
102 };
103
104 /*! \brief Structure for registered object type */
105 struct ast_sorcery_object_type {
106         /*! \brief Unique name of the object type */
107         char name[MAX_OBJECT_TYPE];
108
109         /*! \brief Optional transformation callback */
110         sorcery_transform_handler transform;
111
112         /*! \brief Optional object set apply callback */
113         sorcery_apply_handler apply;
114
115         /*! \brief Optional object copy callback */
116         sorcery_copy_handler copy;
117
118         /*! \brief Optional object diff callback */
119         sorcery_diff_handler diff;
120
121         /*! \brief Wizard instances */
122         struct ao2_container *wizards;
123
124         /*! \brief Object fields */
125         struct ao2_container *fields;
126
127         /*! \brief Configuration framework general information */
128         struct aco_info *info;
129
130         /*! \brief Configuration framework file information */
131         struct aco_file *file;
132
133         /*! \brief Type details */
134         struct aco_type type;
135
136         /*! \brief Observers */
137         struct ao2_container *observers;
138
139         /*! \brief Serializer for observers */
140         struct ast_taskprocessor *serializer;
141
142         /*! \brief Specifies if object type is reloadable or not */
143         unsigned int reloadable:1;
144 };
145
146 /*! \brief Structure for registered object type observer */
147 struct ast_sorcery_object_type_observer {
148         /*! \brief Pointer to the observer implementation */
149         const struct ast_sorcery_observer *callbacks;
150 };
151
152 /*! \brief Structure used for observer invocations */
153 struct sorcery_observer_invocation {
154         /*! \brief Pointer to the object type */
155         struct ast_sorcery_object_type *object_type;
156
157         /*! \brief Pointer to the object */
158         void *object;
159 };
160
161 /*! \brief Structure for registered object field */
162 struct ast_sorcery_object_field {
163         /*! \brief Name of the field */
164         char name[MAX_OBJECT_FIELD];
165
166         /*! \brief The compiled name regex if name is a regex */
167         regex_t *name_regex;
168
169         /*! \brief Callback function for translation of a single value */
170         sorcery_field_handler handler;
171
172         /*! \brief Callback function for translation of multiple values */
173         sorcery_fields_handler multiple_handler;
174
175         /*! \brief Position of the field */
176         intptr_t args[];
177 };
178
179 /*! \brief Structure for an internal wizard instance */
180 struct ast_sorcery_internal_wizard {
181         /*! \brief Wizard interface itself */
182         struct ast_sorcery_wizard callbacks;
183
184         /*! \brief Observers */
185         struct ao2_container *observers;
186 };
187
188 /*! \brief Structure for a wizard instance which operates on objects */
189 struct ast_sorcery_object_wizard {
190         /*! \brief Wizard interface itself */
191         struct ast_sorcery_internal_wizard *wizard;
192
193         /*! \brief Unique data for the wizard */
194         void *data;
195
196         /*! \brief Wizard is acting as an object cache */
197         unsigned int caching:1;
198 };
199
200 /*! \brief Full structure for sorcery */
201 struct ast_sorcery {
202         /*! \brief Container for known object types */
203         struct ao2_container *types;
204
205         /*! \brief Observers */
206         struct ao2_container *observers;
207
208         /*! \brief The name of the module owning this sorcery instance */
209         char module_name[0];
210 };
211
212 /*! \brief Structure for passing load/reload details */
213 struct sorcery_load_details {
214         /*! \brief Sorcery structure in use */
215         const struct ast_sorcery *sorcery;
216
217         /*! \brief Type of object being loaded */
218         const char *type;
219
220         /*! \brief Whether this is a reload or not */
221         unsigned int reload:1;
222 };
223
224 /*! \brief Registered sorcery wizards */
225 static struct ao2_container *wizards;
226
227 /* The following 3 observer wrappers must name their
228  * external observer 'callbacks' and it must be
229  * the first member of the structure.  Common macros
230  * and container callbacks depend on it.
231  */
232
233 /*! \brief A global observer wrapper */
234 struct sorcery_global_observer {
235         const struct ast_sorcery_global_observer *callbacks;
236 };
237
238 /*! \brief An instance observer wrapper */
239 struct sorcery_instance_observer {
240         const struct ast_sorcery_instance_observer *callbacks;
241 };
242
243 /*! \brief A wizard observer wrapper */
244 struct sorcery_wizard_observer {
245         const struct ast_sorcery_wizard_observer *callbacks;
246 };
247
248 /*! \brief Registered global observers */
249 struct ao2_container *observers;
250
251 /*! \brief Registered sorcery instances */
252 static struct ao2_container *instances;
253
254 static int int_handler_fn(const void *obj, const intptr_t *args, char **buf)
255 {
256         int *field = (int *)(obj + args[0]);
257         return (ast_asprintf(buf, "%d", *field) < 0) ? -1 : 0;
258 }
259
260 static int uint_handler_fn(const void *obj, const intptr_t *args, char **buf)
261 {
262         unsigned int *field = (unsigned int *)(obj + args[0]);
263         return (ast_asprintf(buf, "%u", *field) < 0) ? -1 : 0;
264 }
265
266 static int double_handler_fn(const void *obj, const intptr_t *args, char **buf)
267 {
268         double *field = (double *)(obj + args[0]);
269         return (ast_asprintf(buf, "%f", *field) < 0) ? -1 : 0;
270 }
271
272 static int stringfield_handler_fn(const void *obj, const intptr_t *args, char **buf)
273 {
274         ast_string_field *field = (const char **)(obj + args[0]);
275         return !(*buf = ast_strdup(*field)) ? -1 : 0;
276 }
277
278 static int bool_handler_fn(const void *obj, const intptr_t *args, char **buf)
279 {
280         unsigned int *field = (unsigned int *)(obj + args[0]);
281         return !(*buf = ast_strdup(*field ? "true" : "false")) ? -1 : 0;
282 }
283
284 static int sockaddr_handler_fn(const void *obj, const intptr_t *args, char **buf)
285 {
286         struct ast_sockaddr *field = (struct ast_sockaddr *)(obj + args[0]);
287         return !(*buf = ast_strdup(ast_sockaddr_stringify(field))) ? -1 : 0;
288 }
289
290 static int chararray_handler_fn(const void *obj, const intptr_t *args, char **buf)
291 {
292         char *field = (char *)(obj + args[0]);
293         return !(*buf = ast_strdup(field)) ? -1 : 0;
294 }
295
296 static int codec_handler_fn(const void *obj, const intptr_t *args, char **buf)
297 {
298         struct ast_str *codec_buf = ast_str_alloca(64);
299         struct ast_format_cap **cap = (struct ast_format_cap **)(obj + args[0]);
300         return !(*buf = ast_strdup(ast_format_cap_get_names(*cap, &codec_buf)));
301 }
302
303 static sorcery_field_handler sorcery_field_default_handler(enum aco_option_type type)
304 {
305         switch(type) {
306         case OPT_BOOL_T: return bool_handler_fn;
307         case OPT_CHAR_ARRAY_T: return chararray_handler_fn;
308         case OPT_CODEC_T: return codec_handler_fn;
309         case OPT_DOUBLE_T: return double_handler_fn;
310         case OPT_INT_T: return int_handler_fn;
311         case OPT_SOCKADDR_T: return sockaddr_handler_fn;
312         case OPT_STRINGFIELD_T: return stringfield_handler_fn;
313         case OPT_UINT_T: return uint_handler_fn;
314
315         default:
316         case OPT_CUSTOM_T: return NULL;
317         }
318
319         return NULL;
320 }
321
322 /*! \brief Hashing function for sorcery wizards */
323 static int sorcery_wizard_hash(const void *obj, const int flags)
324 {
325         const struct ast_sorcery_internal_wizard *object;
326         const char *key;
327
328         switch (flags & OBJ_SEARCH_MASK) {
329         case OBJ_SEARCH_KEY:
330                 key = obj;
331                 break;
332         case OBJ_SEARCH_OBJECT:
333                 object = obj;
334                 key = object->callbacks.name;
335                 break;
336         default:
337                 ast_assert(0);
338                 return 0;
339         }
340         return ast_str_hash(key);
341 }
342
343 /*! \brief Comparator function for sorcery wizards */
344 static int sorcery_wizard_cmp(void *obj, void *arg, int flags)
345 {
346         const struct ast_sorcery_internal_wizard *object_left = obj;
347         const struct ast_sorcery_internal_wizard *object_right = arg;
348         const char *right_key = arg;
349         int cmp;
350
351         switch (flags & OBJ_SEARCH_MASK) {
352         case OBJ_SEARCH_OBJECT:
353                 right_key = object_right->callbacks.name;
354                 /* Fall through */
355         case OBJ_SEARCH_KEY:
356                 cmp = strcmp(object_left->callbacks.name, right_key);
357                 break;
358         case OBJ_SEARCH_PARTIAL_KEY:
359                 cmp = strncmp(object_left->callbacks.name, right_key, strlen(right_key));
360                 break;
361         default:
362                 cmp = 0;
363                 break;
364         }
365         if (cmp) {
366                 return 0;
367         }
368         return CMP_MATCH;
369 }
370
371 /*! \brief Hashing function for sorcery wizards */
372 static int object_type_field_hash(const void *obj, const int flags)
373 {
374         const struct ast_sorcery_object_field *object_field;
375         const char *key;
376
377         switch (flags & OBJ_SEARCH_MASK) {
378         case OBJ_SEARCH_KEY:
379                 key = obj;
380                 break;
381         case OBJ_SEARCH_OBJECT:
382                 object_field = obj;
383                 key = object_field->name;
384                 break;
385         default:
386                 ast_assert(0);
387                 return 0;
388         }
389         return ast_str_hash(key);
390 }
391
392 static int object_type_field_cmp(void *obj, void *arg, int flags)
393 {
394         const struct ast_sorcery_object_field *field_left = obj;
395         const struct ast_sorcery_object_field *field_right = arg;
396         const char *right_key = arg;
397         int cmp;
398
399         switch (flags & OBJ_SEARCH_MASK) {
400         case OBJ_SEARCH_OBJECT:
401                 right_key = field_right->name;
402                 /* Fall through */
403         case OBJ_SEARCH_KEY:
404                 cmp = strcmp(field_left->name, right_key);
405                 break;
406         case OBJ_SEARCH_PARTIAL_KEY:
407                 cmp = strncmp(field_left->name, right_key, strlen(right_key));
408                 break;
409         default:
410                 cmp = 0;
411                 break;
412         }
413         if (cmp) {
414                 return 0;
415         }
416         return CMP_MATCH;
417 }
418
419 /*! \brief Cleanup function */
420 static void sorcery_exit(void)
421 {
422         ast_threadpool_shutdown(threadpool);
423         threadpool = NULL;
424 }
425
426 /*! \brief Cleanup function for graceful shutdowns */
427 static void sorcery_cleanup(void)
428 {
429         ao2_cleanup(wizards);
430         wizards = NULL;
431         ao2_cleanup(observers);
432         observers = NULL;
433         ao2_cleanup(instances);
434         instances = NULL;
435 }
436
437 /*! \brief Compare function for sorcery instances */
438 static int sorcery_instance_cmp(void *obj, void *arg, int flags)
439 {
440         const struct ast_sorcery *object_left = obj;
441         const struct ast_sorcery *object_right = arg;
442         const char *right_key = arg;
443         int cmp;
444
445         switch (flags & OBJ_SEARCH_MASK) {
446         case OBJ_SEARCH_OBJECT:
447                 right_key = object_right->module_name;
448                 /* Fall through */
449         case OBJ_SEARCH_KEY:
450                 cmp = strcmp(object_left->module_name, right_key);
451                 break;
452         case OBJ_SEARCH_PARTIAL_KEY:
453                 cmp = strncmp(object_left->module_name, right_key, strlen(right_key));
454                 break;
455         default:
456                 cmp = 0;
457                 break;
458         }
459         if (cmp) {
460                 return 0;
461         }
462         return CMP_MATCH;
463 }
464
465 /*! \brief Hashing function for sorcery instances */
466 static int sorcery_instance_hash(const void *obj, const int flags)
467 {
468         const struct ast_sorcery *object;
469         const char *key;
470
471         switch (flags & OBJ_SEARCH_MASK) {
472         case OBJ_SEARCH_KEY:
473                 key = obj;
474                 break;
475         case OBJ_SEARCH_OBJECT:
476                 object = obj;
477                 key = object->module_name;
478                 break;
479         default:
480                 ast_assert(0);
481                 return 0;
482         }
483         return ast_str_hash(key);
484 }
485
486 int ast_sorcery_init(void)
487 {
488         struct ast_threadpool_options options = {
489                 .version = AST_THREADPOOL_OPTIONS_VERSION,
490                 .auto_increment = 1,
491                 .max_size = 0,
492                 .idle_timeout = 60,
493                 .initial_size = 0,
494         };
495         ast_assert(wizards == NULL);
496
497         if (!(threadpool = ast_threadpool_create("Sorcery", NULL, &options))) {
498                 threadpool = NULL;
499                 return -1;
500         }
501
502         if (!(wizards = ao2_container_alloc(WIZARD_BUCKETS, sorcery_wizard_hash, sorcery_wizard_cmp))) {
503                 ast_threadpool_shutdown(threadpool);
504                 return -1;
505         }
506
507         observers = ao2_container_alloc_list(AO2_ALLOC_OPT_LOCK_RWLOCK, 0, NULL, NULL);
508         if (!observers) {
509                 sorcery_cleanup();
510                 sorcery_exit();
511                 return -1;
512         }
513
514         instances = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_RWLOCK, INSTANCE_BUCKETS,
515                 sorcery_instance_hash, sorcery_instance_cmp);
516         if (!instances) {
517                 sorcery_cleanup();
518                 sorcery_exit();
519                 return -1;
520         }
521
522         ast_register_cleanup(sorcery_cleanup);
523         ast_register_atexit(sorcery_exit);
524
525         return 0;
526 }
527
528 static void sorcery_internal_wizard_destructor(void *obj)
529 {
530         struct ast_sorcery_internal_wizard *wizard = obj;
531
532         ao2_cleanup(wizard->observers);
533 }
534
535 int __ast_sorcery_wizard_register(const struct ast_sorcery_wizard *interface, struct ast_module *module)
536 {
537         struct ast_sorcery_internal_wizard *wizard;
538         int res = -1;
539
540         ast_assert(!ast_strlen_zero(interface->name));
541
542         ao2_lock(wizards);
543
544         if ((wizard = ao2_find(wizards, interface->name, OBJ_KEY | OBJ_NOLOCK))) {
545                 ast_log(LOG_WARNING, "Attempted to register sorcery wizard '%s' twice\n",
546                         interface->name);
547                 goto done;
548         }
549
550         if (!(wizard = ao2_alloc(sizeof(*wizard), sorcery_internal_wizard_destructor))) {
551                 goto done;
552         }
553
554         wizard->callbacks = *interface;
555         wizard->callbacks.module = module;
556
557         wizard->observers = ao2_container_alloc_list(AO2_ALLOC_OPT_LOCK_RWLOCK, 0, NULL, NULL);
558         if (!wizard->observers) {
559                 goto done;
560         }
561
562         ao2_link_flags(wizards, wizard, OBJ_NOLOCK);
563         res = 0;
564
565         ast_verb(2, "Sorcery registered wizard '%s'\n", interface->name);
566
567         NOTIFY_GLOBAL_OBSERVERS(observers, wizard_registered,
568                 interface->name, interface);
569
570 done:
571         ao2_cleanup(wizard);
572         ao2_unlock(wizards);
573
574         return res;
575 }
576
577 int ast_sorcery_wizard_unregister(const struct ast_sorcery_wizard *interface)
578 {
579         struct ast_sorcery_internal_wizard *wizard =
580                 interface ? ao2_find(wizards, interface->name, OBJ_SEARCH_KEY) : NULL;
581
582         if (wizard) {
583                 NOTIFY_GLOBAL_OBSERVERS(observers, wizard_unregistering, wizard->callbacks.name, &wizard->callbacks);
584                 ao2_unlink(wizards, wizard);
585                 ao2_ref(wizard, -1);
586                 ast_verb(2, "Sorcery unregistered wizard '%s'\n", interface->name);
587                 return 0;
588         } else {
589                 return -1;
590         }
591 }
592
593 /*! \brief Internal callback function for removing a generic observer */
594 static int sorcery_generic_observer_remove(void *obj, void *arg, int flags)
595 {
596         const struct sorcery_global_observer *observer = obj;
597
598         return (observer->callbacks == arg) ? CMP_MATCH | CMP_STOP : 0;
599 }
600
601 int ast_sorcery_global_observer_add(const struct ast_sorcery_global_observer *callbacks)
602 {
603         struct sorcery_global_observer *cb;
604
605         cb = ao2_alloc(sizeof(*cb), NULL);
606         if (!cb) {
607                 return -1;
608         }
609
610         cb->callbacks = callbacks;
611         ao2_link(observers, cb);
612         ao2_ref(cb, -1);
613
614         return 0;
615 }
616
617 void ast_sorcery_global_observer_remove(
618         const struct ast_sorcery_global_observer *callbacks)
619 {
620         ao2_callback(observers, OBJ_NODATA | OBJ_UNLINK, sorcery_generic_observer_remove, (void *)callbacks);
621 }
622
623 int ast_sorcery_instance_observer_add(struct ast_sorcery *sorcery,
624         const struct ast_sorcery_instance_observer *callbacks)
625 {
626         struct sorcery_instance_observer *cb;
627
628         cb = ao2_alloc(sizeof(*cb), NULL);
629         if (!cb) {
630                 return -1;
631         }
632
633         cb->callbacks = callbacks;
634         ao2_link(sorcery->observers, cb);
635         ao2_ref(cb, -1);
636
637         return 0;
638 }
639
640 void ast_sorcery_instance_observer_remove(struct ast_sorcery *sorcery,
641         const struct ast_sorcery_instance_observer *callbacks)
642 {
643         ao2_callback(sorcery->observers, OBJ_NODATA | OBJ_UNLINK, sorcery_generic_observer_remove, (void *)callbacks);
644 }
645
646 int ast_sorcery_wizard_observer_add(struct ast_sorcery_wizard *interface,
647         const struct ast_sorcery_wizard_observer *callbacks)
648 {
649         RAII_VAR(struct ast_sorcery_internal_wizard *, wizard,
650                 interface ? ao2_find(wizards, interface->name, OBJ_SEARCH_KEY) : NULL,
651                         ao2_cleanup);
652
653         if (wizard) {
654                 struct sorcery_wizard_observer *cb;
655
656                 cb = ao2_alloc(sizeof(*cb), NULL);
657                 if (!cb) {
658                         return -1;
659                 }
660
661                 cb->callbacks = callbacks;
662                 ao2_link(wizard->observers, cb);
663                 ao2_ref(cb, -1);
664
665                 return 0;
666         }
667
668         return -1;
669 }
670
671 void ast_sorcery_wizard_observer_remove(struct ast_sorcery_wizard *interface,
672         const struct ast_sorcery_wizard_observer *callbacks)
673 {
674         RAII_VAR(struct ast_sorcery_internal_wizard *, wizard,
675                 interface ? ao2_find(wizards, interface->name, OBJ_SEARCH_KEY) : NULL,
676                         ao2_cleanup);
677
678         if (wizard) {
679                 ao2_callback(wizard->observers, OBJ_NODATA | OBJ_UNLINK, sorcery_generic_observer_remove, (void *)callbacks);
680         }
681 }
682
683 /*! \brief Destructor called when sorcery structure is destroyed */
684 static void sorcery_destructor(void *obj)
685 {
686         struct ast_sorcery *sorcery = obj;
687
688         if (sorcery->observers) {
689                 NOTIFY_GLOBAL_OBSERVERS(observers, instance_destroying, sorcery->module_name, sorcery);
690         }
691         ao2_cleanup(sorcery->observers);
692         ao2_cleanup(sorcery->types);
693 }
694
695 /*! \brief Hashing function for sorcery types */
696 static int sorcery_type_hash(const void *obj, const int flags)
697 {
698         const struct ast_sorcery_object_type *object;
699         const char *key;
700
701         switch (flags & OBJ_SEARCH_MASK) {
702         case OBJ_SEARCH_KEY:
703                 key = obj;
704                 break;
705         case OBJ_SEARCH_OBJECT:
706                 object = obj;
707                 key = object->name;
708                 break;
709         default:
710                 ast_assert(0);
711                 return 0;
712         }
713         return ast_str_hash(key);
714 }
715
716 /*! \brief Comparator function for sorcery types */
717 static int sorcery_type_cmp(void *obj, void *arg, int flags)
718 {
719         const struct ast_sorcery_object_type *object_left = obj;
720         const struct ast_sorcery_object_type *object_right = arg;
721         const char *right_key = arg;
722         int cmp;
723
724         switch (flags & OBJ_SEARCH_MASK) {
725         case OBJ_SEARCH_OBJECT:
726                 right_key = object_right->name;
727                 /* Fall through */
728         case OBJ_SEARCH_KEY:
729                 cmp = strcmp(object_left->name, right_key);
730                 break;
731         case OBJ_SEARCH_PARTIAL_KEY:
732                 cmp = strncmp(object_left->name, right_key, strlen(right_key));
733                 break;
734         default:
735                 cmp = 0;
736                 break;
737         }
738         if (cmp) {
739                 return 0;
740         }
741         return CMP_MATCH;
742 }
743
744 struct ast_sorcery *__ast_sorcery_open(const char *module_name)
745 {
746         struct ast_sorcery *sorcery;
747
748         ast_assert(module_name != NULL);
749
750         ao2_wrlock(instances);
751         if ((sorcery = ao2_find(instances, module_name, OBJ_SEARCH_KEY | OBJ_NOLOCK))) {
752                 goto done;
753         }
754
755         if (!(sorcery = ao2_alloc(sizeof(*sorcery) + strlen(module_name) + 1, sorcery_destructor))) {
756                 goto done;
757         }
758
759         if (!(sorcery->types = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_RWLOCK, TYPE_BUCKETS, sorcery_type_hash, sorcery_type_cmp))) {
760                 ao2_ref(sorcery, -1);
761                 sorcery = NULL;
762                 goto done;
763         }
764
765         if (!(sorcery->observers = ao2_container_alloc_list(AO2_ALLOC_OPT_LOCK_RWLOCK, 0, NULL, NULL))) {
766                 ao2_ref(sorcery, -1);
767                 sorcery = NULL;
768                 goto done;
769         }
770
771         strcpy(sorcery->module_name, module_name); /* Safe */
772
773         if (__ast_sorcery_apply_config(sorcery, module_name, module_name) == AST_SORCERY_APPLY_FAIL) {
774                 ast_log(LOG_ERROR, "Error attempting to apply configuration %s to sorcery.\n", module_name);
775                 ao2_cleanup(sorcery);
776                 sorcery = NULL;
777                 goto done;
778         }
779
780         ao2_link_flags(instances, sorcery, OBJ_NOLOCK);
781
782         NOTIFY_GLOBAL_OBSERVERS(observers, instance_created, module_name, sorcery);
783
784 done:
785         ao2_unlock(instances);
786         return sorcery;
787 }
788
789 /*! \brief Search function for sorcery instances */
790 struct ast_sorcery *ast_sorcery_retrieve_by_module_name(const char *module_name)
791 {
792         return ao2_find(instances, module_name, OBJ_SEARCH_KEY);
793 }
794
795 /*! \brief Destructor function for object types */
796 static void sorcery_object_type_destructor(void *obj)
797 {
798         struct ast_sorcery_object_type *object_type = obj;
799
800         ao2_cleanup(object_type->wizards);
801         ao2_cleanup(object_type->fields);
802         ao2_cleanup(object_type->observers);
803
804         if (object_type->info) {
805                 aco_info_destroy(object_type->info);
806                 ast_free(object_type->info);
807         }
808
809         ast_free(object_type->file);
810
811         ast_taskprocessor_unreference(object_type->serializer);
812 }
813
814 /*! \brief Internal function which allocates an object type structure */
815 static struct ast_sorcery_object_type *sorcery_object_type_alloc(const char *type, const char *module)
816 {
817         struct ast_sorcery_object_type *object_type;
818         char uuid[AST_UUID_STR_LEN];
819
820         if (!(object_type = ao2_alloc(sizeof(*object_type), sorcery_object_type_destructor))) {
821                 return NULL;
822         }
823
824         /* Order matters for object wizards */
825         if (!(object_type->wizards = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_NOLOCK, 1, NULL, sorcery_wizard_cmp))) {
826                 ao2_ref(object_type, -1);
827                 return NULL;
828         }
829
830         if (!(object_type->fields = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_NOLOCK, OBJECT_FIELD_BUCKETS,
831                                         object_type_field_hash, object_type_field_cmp))) {
832                 ao2_ref(object_type, -1);
833                 return NULL;
834         }
835
836         if (!(object_type->observers = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_RWLOCK, 1, NULL, NULL))) {
837                 ao2_ref(object_type, -1);
838                 return NULL;
839         }
840
841         if (!(object_type->info = ast_calloc(1, sizeof(*object_type->info) + 2 * sizeof(object_type->info->files[0])))) {
842                 ao2_ref(object_type, -1);
843                 return NULL;
844         }
845
846         if (!(object_type->file = ast_calloc(1, sizeof(*object_type->file) + 2 * sizeof(object_type->file->types[0])))) {
847                 ao2_ref(object_type, -1);
848                 return NULL;
849         }
850
851         if (!ast_uuid_generate_str(uuid, sizeof(uuid))) {
852                 ao2_ref(object_type, -1);
853                 return NULL;
854         }
855
856         if (!(object_type->serializer = ast_threadpool_serializer(uuid, threadpool))) {
857                 ao2_ref(object_type, -1);
858                 return NULL;
859         }
860
861         object_type->info->files[0] = object_type->file;
862         object_type->info->files[1] = NULL;
863         object_type->info->module = module;
864
865         ast_copy_string(object_type->name, type, sizeof(object_type->name));
866
867         return object_type;
868 }
869
870 /*! \brief Object wizard destructor */
871 static void sorcery_object_wizard_destructor(void *obj)
872 {
873         struct ast_sorcery_object_wizard *object_wizard = obj;
874
875         if (object_wizard->data) {
876                 object_wizard->wizard->callbacks.close(object_wizard->data);
877         }
878
879         if (object_wizard->wizard) {
880                 ast_module_unref(object_wizard->wizard->callbacks.module);
881         }
882
883         ao2_cleanup(object_wizard->wizard);
884 }
885
886 /*! \brief Internal function which creates an object type and adds a wizard mapping */
887 enum ast_sorcery_apply_result __ast_sorcery_apply_wizard_mapping(struct ast_sorcery *sorcery,
888                 const char *type, const char *module, const char *name, const char *data, unsigned int caching)
889 {
890         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
891         RAII_VAR(struct ast_sorcery_internal_wizard *, wizard, ao2_find(wizards, name, OBJ_KEY), ao2_cleanup);
892         RAII_VAR(struct ast_sorcery_object_wizard *, object_wizard, ao2_alloc(sizeof(*object_wizard), sorcery_object_wizard_destructor), ao2_cleanup);
893         int created = 0;
894
895         if (!wizard) {
896                 ast_log(LOG_ERROR, "Wizard '%s' could not be applied to object type '%s' as it was not found\n",
897                         name, type);
898                 return AST_SORCERY_APPLY_FAIL;
899         } else if (!object_wizard) {
900                 return AST_SORCERY_APPLY_FAIL;
901         }
902
903         if (!object_type) {
904                 if (!(object_type = sorcery_object_type_alloc(type, module))) {
905                         return AST_SORCERY_APPLY_FAIL;
906                 }
907                 created = 1;
908         }
909
910         if (!created) {
911                 struct ast_sorcery_wizard *found;
912
913                 found = ao2_find(object_type->wizards, wizard, OBJ_SEARCH_OBJECT);
914                 if (found) {
915                         ast_debug(1, "Wizard %s already applied to object type %s\n",
916                                         wizard->callbacks.name, object_type->name);
917                         ao2_cleanup(found);
918                         return AST_SORCERY_APPLY_DUPLICATE;
919                 }
920         }
921
922         if (wizard->callbacks.open && !(object_wizard->data = wizard->callbacks.open(data))) {
923                 return AST_SORCERY_APPLY_FAIL;
924         }
925
926         ast_module_ref(wizard->callbacks.module);
927
928         object_wizard->wizard = ao2_bump(wizard);
929         object_wizard->caching = caching;
930
931         ao2_link(object_type->wizards, object_wizard);
932
933         if (created) {
934                 ao2_link(sorcery->types, object_type);
935         }
936
937         NOTIFY_INSTANCE_OBSERVERS(sorcery->observers, wizard_mapped,
938                 sorcery->module_name, sorcery, type, &wizard->callbacks, data, object_wizard->data);
939
940         return AST_SORCERY_APPLY_SUCCESS;
941 }
942
943 enum ast_sorcery_apply_result  __ast_sorcery_apply_config(struct ast_sorcery *sorcery, const char *name, const char *module)
944 {
945         struct ast_flags flags = { 0 };
946         struct ast_config *config = ast_config_load2("sorcery.conf", "sorcery", flags);
947         struct ast_variable *mapping;
948         int res = AST_SORCERY_APPLY_SUCCESS;
949
950         if (!config) {
951                 return AST_SORCERY_APPLY_NO_CONFIGURATION;
952         }
953
954         if (config == CONFIG_STATUS_FILEINVALID) {
955                 return AST_SORCERY_APPLY_FAIL;
956         }
957
958         for (mapping = ast_variable_browse(config, name); mapping; mapping = mapping->next) {
959                 RAII_VAR(char *, mapping_name, ast_strdup(mapping->name), ast_free);
960                 RAII_VAR(char *, mapping_value, ast_strdup(mapping->value), ast_free);
961                 char *options = mapping_name;
962                 char *type = strsep(&options, "/");
963                 char *data = mapping_value;
964                 char *wizard = strsep(&data, ",");
965                 unsigned int caching = 0;
966
967                 /* If no object type or wizard exists just skip, nothing we can do */
968                 if (ast_strlen_zero(type) || ast_strlen_zero(wizard)) {
969                         continue;
970                 }
971
972                 /* If the wizard is configured as a cache treat it as such */
973                 if (!ast_strlen_zero(options) && strstr(options, "cache")) {
974                         caching = 1;
975                 }
976
977                 /* Any error immediately causes us to stop */
978                 if (__ast_sorcery_apply_wizard_mapping(sorcery, type, module, wizard, data, caching) == AST_SORCERY_APPLY_FAIL) {
979                         res = AST_SORCERY_APPLY_FAIL;
980                         break;
981                 }
982         }
983
984         ast_config_destroy(config);
985
986         return res;
987 }
988
989 enum ast_sorcery_apply_result __ast_sorcery_apply_default(struct ast_sorcery *sorcery, const char *type, const char *module, const char *name, const char *data)
990 {
991         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
992
993         /* Defaults can not be added if any existing mapping exists */
994         if (object_type) {
995                 return AST_SORCERY_APPLY_DEFAULT_UNNECESSARY;
996         }
997
998         return __ast_sorcery_apply_wizard_mapping(sorcery, type, module, name, data, 0);
999 }
1000
1001 static int sorcery_extended_config_handler(const struct aco_option *opt, struct ast_variable *var, void *obj)
1002 {
1003         return ast_sorcery_object_set_extended(obj, var->name, var->value);
1004 }
1005
1006 static int sorcery_extended_fields_handler(const void *obj, struct ast_variable **fields)
1007 {
1008         const struct ast_sorcery_object_details *details = obj;
1009
1010         if (details->object->extended) {
1011                 *fields = ast_variables_dup(details->object->extended);
1012         } else {
1013                 *fields = NULL;
1014         }
1015
1016         return 0;
1017 }
1018
1019 int __ast_sorcery_object_register(struct ast_sorcery *sorcery, const char *type, unsigned int hidden, unsigned int reloadable, aco_type_item_alloc alloc, sorcery_transform_handler transform, sorcery_apply_handler apply)
1020 {
1021         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1022
1023         if (!object_type || object_type->type.item_alloc) {
1024                 return -1;
1025         }
1026
1027         object_type->type.name = object_type->name;
1028         object_type->type.type = ACO_ITEM;
1029         object_type->type.category = ".?";
1030         object_type->type.item_alloc = alloc;
1031         object_type->type.hidden = hidden;
1032
1033         object_type->reloadable = reloadable;
1034         object_type->transform = transform;
1035         object_type->apply = apply;
1036         object_type->file->types[0] = &object_type->type;
1037         object_type->file->types[1] = NULL;
1038
1039         if (aco_info_init(object_type->info)) {
1040                 return -1;
1041         }
1042
1043         if (ast_sorcery_object_fields_register(sorcery, type, "^@", sorcery_extended_config_handler, sorcery_extended_fields_handler)) {
1044                 return -1;
1045         }
1046
1047         NOTIFY_INSTANCE_OBSERVERS(sorcery->observers, object_type_registered,
1048                 sorcery->module_name, sorcery, type);
1049
1050         return 0;
1051 }
1052
1053 void ast_sorcery_object_set_copy_handler(struct ast_sorcery *sorcery, const char *type, sorcery_copy_handler copy)
1054 {
1055         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1056
1057         if (!object_type) {
1058                 return;
1059         }
1060
1061         object_type->copy = copy;
1062 }
1063
1064 void ast_sorcery_object_set_diff_handler(struct ast_sorcery *sorcery, const char *type, sorcery_diff_handler diff)
1065 {
1066         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1067
1068         if (!object_type) {
1069                 return;
1070         }
1071
1072         object_type->diff = diff;
1073 }
1074
1075 static void sorcery_object_field_destructor(void *obj)
1076 {
1077         struct ast_sorcery_object_field *object_field = obj;
1078
1079         if (object_field->name_regex) {
1080                 regfree(object_field->name_regex);
1081         }
1082 }
1083
1084 int ast_sorcery_object_fields_register(struct ast_sorcery *sorcery, const char *type, const char *regex, aco_option_handler config_handler, sorcery_fields_handler sorcery_handler)
1085 {
1086 #define MAX_REGEX_ERROR_LEN 128
1087         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1088         RAII_VAR(struct ast_sorcery_object_field *, object_field, NULL, ao2_cleanup);
1089         int rc;
1090
1091         if (!object_type || !object_type->type.item_alloc || !config_handler
1092                 || !(object_field = ao2_alloc(sizeof(*object_field), sorcery_object_field_destructor))) {
1093                 return -1;
1094         }
1095
1096         ast_copy_string(object_field->name, regex, sizeof(object_field->name));
1097         object_field->multiple_handler = sorcery_handler;
1098
1099         if (!(object_field->name_regex = ast_calloc(1, sizeof(regex_t)))) {
1100                 return -1;
1101         }
1102
1103         if ((rc = regcomp(object_field->name_regex, regex, REG_EXTENDED | REG_NOSUB))) {
1104                 char *regerr = ast_alloca(MAX_REGEX_ERROR_LEN);
1105                 regerror(rc, object_field->name_regex, regerr, MAX_REGEX_ERROR_LEN);
1106                 ast_log(LOG_ERROR, "Regular expression '%s' failed to compile: %s\n", regex, regerr);
1107                 return -1;
1108         }
1109
1110         ao2_link(object_type->fields, object_field);
1111         __aco_option_register(object_type->info, regex, ACO_REGEX, object_type->file->types, "", OPT_CUSTOM_T, config_handler, 0, 1, 0);
1112
1113         return 0;
1114 }
1115
1116 int __ast_sorcery_object_field_register(struct ast_sorcery *sorcery, const char *type, const char *name, const char *default_val, enum aco_option_type opt_type,
1117                                         aco_option_handler config_handler, sorcery_field_handler sorcery_handler, sorcery_fields_handler multiple_handler, unsigned int flags, unsigned int no_doc, unsigned int alias, size_t argc, ...)
1118 {
1119         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1120         RAII_VAR(struct ast_sorcery_object_field *, object_field, NULL, ao2_cleanup);
1121         int pos;
1122         va_list args;
1123
1124         if (!strcmp(type, "id") || !object_type || !object_type->type.item_alloc) {
1125                 return -1;
1126         }
1127
1128         if (!sorcery_handler) {
1129                 sorcery_handler = sorcery_field_default_handler(opt_type);
1130         }
1131
1132         if (!(object_field = ao2_alloc(sizeof(*object_field) + argc * sizeof(object_field->args[0]), NULL))) {
1133                 return -1;
1134         }
1135
1136         ast_copy_string(object_field->name, name, sizeof(object_field->name));
1137         object_field->handler = sorcery_handler;
1138         object_field->multiple_handler = multiple_handler;
1139
1140         va_start(args, argc);
1141         for (pos = 0; pos < argc; pos++) {
1142                 object_field->args[pos] = va_arg(args, size_t);
1143         }
1144         va_end(args);
1145
1146         if (!alias) {
1147                 ao2_link(object_type->fields, object_field);
1148         }
1149
1150         /* TODO: Improve this hack */
1151         if (!argc) {
1152                 __aco_option_register(object_type->info, name, ACO_EXACT, object_type->file->types, default_val, opt_type, config_handler, flags, no_doc, argc);
1153         } else if (argc == 1) {
1154                 __aco_option_register(object_type->info, name, ACO_EXACT, object_type->file->types, default_val, opt_type, config_handler, flags, no_doc, argc,
1155                         object_field->args[0]);
1156         } else if (argc == 2) {
1157                 __aco_option_register(object_type->info, name, ACO_EXACT, object_type->file->types, default_val, opt_type, config_handler, flags, no_doc, argc,
1158                         object_field->args[0], object_field->args[1]);
1159         } else if (argc == 3) {
1160                 __aco_option_register(object_type->info, name, ACO_EXACT, object_type->file->types, default_val, opt_type, config_handler, flags, no_doc, argc,
1161                         object_field->args[0], object_field->args[1], object_field->args[2]);
1162         } else {
1163                 ast_assert(0); /* The hack... she does us no good for this */
1164         }
1165
1166         return 0;
1167 }
1168
1169 /*! \brief Retrieves whether or not the type is reloadable */
1170 static int sorcery_reloadable(const struct ast_sorcery *sorcery, const char *type)
1171 {
1172         RAII_VAR(struct ast_sorcery_object_type *, object_type,
1173                  ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1174         return object_type && object_type->reloadable;
1175 }
1176
1177 static int sorcery_wizard_load(void *obj, void *arg, int flags)
1178 {
1179         struct ast_sorcery_object_wizard *wizard = obj;
1180         struct sorcery_load_details *details = arg;
1181         void (*load)(void *data, const struct ast_sorcery *sorcery, const char *type);
1182
1183         load = !details->reload ? wizard->wizard->callbacks.load : wizard->wizard->callbacks.reload;
1184
1185         if (load) {
1186                 NOTIFY_WIZARD_OBSERVERS(wizard->wizard->observers, wizard_loading,
1187                         wizard->wizard->callbacks.name, &wizard->wizard->callbacks, details->type, details->reload);
1188
1189                 load(wizard->data, details->sorcery, details->type);
1190
1191                 NOTIFY_WIZARD_OBSERVERS(wizard->wizard->observers, wizard_loaded,
1192                         wizard->wizard->callbacks.name, &wizard->wizard->callbacks, details->type, details->reload);
1193         }
1194
1195         return 0;
1196 }
1197
1198 /*! \brief Destructor for observer invocation */
1199 static void sorcery_observer_invocation_destroy(void *obj)
1200 {
1201         struct sorcery_observer_invocation *invocation = obj;
1202
1203         ao2_cleanup(invocation->object_type);
1204         ao2_cleanup(invocation->object);
1205 }
1206
1207 /*! \brief Allocator function for observer invocation */
1208 static struct sorcery_observer_invocation *sorcery_observer_invocation_alloc(struct ast_sorcery_object_type *object_type, void *object)
1209 {
1210         struct sorcery_observer_invocation *invocation = ao2_alloc(sizeof(*invocation), sorcery_observer_invocation_destroy);
1211
1212         if (!invocation) {
1213                 return NULL;
1214         }
1215
1216         ao2_ref(object_type, +1);
1217         invocation->object_type = object_type;
1218
1219         if (object) {
1220                 ao2_ref(object, +1);
1221                 invocation->object = object;
1222         }
1223
1224         return invocation;
1225 }
1226
1227 /*! \brief Internal callback function which notifies an individual observer that an object type has been loaded */
1228 static int sorcery_observer_notify_loaded(void *obj, void *arg, int flags)
1229 {
1230         const struct ast_sorcery_object_type_observer *observer = obj;
1231
1232         if (observer->callbacks->loaded) {
1233                 observer->callbacks->loaded(arg);
1234         }
1235
1236         return 0;
1237 }
1238
1239 /*! \brief Internal callback function which notifies observers that an object type has been loaded */
1240 static int sorcery_observers_notify_loaded(void *data)
1241 {
1242         struct sorcery_observer_invocation *invocation = data;
1243
1244         ao2_callback(invocation->object_type->observers, OBJ_NODATA, sorcery_observer_notify_loaded, invocation->object_type->name);
1245         ao2_cleanup(invocation);
1246
1247         return 0;
1248 }
1249
1250 static int sorcery_object_load(void *obj, void *arg, int flags)
1251 {
1252         struct ast_sorcery_object_type *type = obj;
1253         struct sorcery_load_details *details = arg;
1254
1255         if (!type->type.item_alloc) {
1256                 return 0;
1257         }
1258
1259         details->type = type->name;
1260
1261         if (details->reload && !sorcery_reloadable(details->sorcery, details->type)) {
1262                 ast_log(LOG_NOTICE, "Type '%s' is not reloadable, maintaining previous values\n",
1263                         details->type);
1264                 return 0;
1265         }
1266
1267         NOTIFY_INSTANCE_OBSERVERS(details->sorcery->observers, object_type_loading,
1268                 details->sorcery->module_name, details->sorcery, type->name, details->reload);
1269
1270         ao2_callback(type->wizards, OBJ_NODATA, sorcery_wizard_load, details);
1271
1272         NOTIFY_INSTANCE_OBSERVERS(details->sorcery->observers, object_type_loaded,
1273                 details->sorcery->module_name, details->sorcery, type->name, details->reload);
1274
1275         if (ao2_container_count(type->observers)) {
1276                 struct sorcery_observer_invocation *invocation;
1277
1278                 invocation = sorcery_observer_invocation_alloc(type, NULL);
1279                 if (invocation
1280                         && ast_taskprocessor_push(type->serializer, sorcery_observers_notify_loaded,
1281                                 invocation)) {
1282                         ao2_cleanup(invocation);
1283                 }
1284         }
1285
1286         return 0;
1287 }
1288
1289 void ast_sorcery_load(const struct ast_sorcery *sorcery)
1290 {
1291         struct sorcery_load_details details = {
1292                 .sorcery = sorcery,
1293                 .reload = 0,
1294         };
1295
1296         NOTIFY_INSTANCE_OBSERVERS(sorcery->observers, instance_loading,
1297                 sorcery->module_name, sorcery, 0);
1298
1299         ao2_callback(sorcery->types, OBJ_NODATA, sorcery_object_load, &details);
1300
1301         NOTIFY_INSTANCE_OBSERVERS(sorcery->observers, instance_loaded,
1302                 sorcery->module_name, sorcery, 0);
1303 }
1304
1305 void ast_sorcery_load_object(const struct ast_sorcery *sorcery, const char *type)
1306 {
1307         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1308         struct sorcery_load_details details = {
1309                 .sorcery = sorcery,
1310                 .reload = 0,
1311         };
1312
1313         if (!object_type) {
1314                 return;
1315         }
1316
1317         sorcery_object_load(object_type, &details, 0);
1318 }
1319
1320 void ast_sorcery_reload(const struct ast_sorcery *sorcery)
1321 {
1322         struct sorcery_load_details details = {
1323                 .sorcery = sorcery,
1324                 .reload = 1,
1325         };
1326
1327         NOTIFY_INSTANCE_OBSERVERS(sorcery->observers, instance_loading,
1328                 sorcery->module_name, sorcery, 1);
1329
1330         ao2_callback(sorcery->types, OBJ_NODATA, sorcery_object_load, &details);
1331
1332         NOTIFY_INSTANCE_OBSERVERS(sorcery->observers, instance_loaded,
1333                 sorcery->module_name, sorcery, 1);
1334
1335 }
1336
1337 void ast_sorcery_reload_object(const struct ast_sorcery *sorcery, const char *type)
1338 {
1339         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1340         struct sorcery_load_details details = {
1341                 .sorcery = sorcery,
1342                 .reload = 1,
1343         };
1344
1345         if (!object_type) {
1346                 return;
1347         }
1348
1349         sorcery_object_load(object_type, &details, 0);
1350 }
1351
1352 void ast_sorcery_ref(struct ast_sorcery *sorcery)
1353 {
1354         ao2_ref(sorcery, +1);
1355 }
1356
1357 static struct ast_variable *get_single_field_as_var_list(const void *object, struct ast_sorcery_object_field *object_field)
1358 {
1359         struct ast_variable *tmp = NULL;
1360         char *buf = NULL;
1361
1362         if (!object_field->handler) {
1363                 return NULL;
1364         }
1365
1366         if (!(object_field->handler(object, object_field->args, &buf))) {
1367                 tmp = ast_variable_new(object_field->name, S_OR(buf, ""), "");
1368         }
1369         ast_free(buf);
1370
1371         return tmp;
1372 }
1373
1374 static struct ast_variable *get_multiple_fields_as_var_list(const void *object, struct ast_sorcery_object_field *object_field)
1375 {
1376         struct ast_variable *tmp = NULL;
1377
1378         if (!object_field->multiple_handler) {
1379                 return NULL;
1380         }
1381
1382         if (object_field->multiple_handler(object, &tmp)) {
1383                 ast_variables_destroy(tmp);
1384                 tmp = NULL;
1385         }
1386
1387         return tmp;
1388 }
1389
1390 struct ast_variable *ast_sorcery_objectset_create2(const struct ast_sorcery *sorcery,
1391         const void *object,     enum ast_sorcery_field_handler_flags flags)
1392 {
1393         const struct ast_sorcery_object_details *details = object;
1394         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1395         struct ao2_iterator i;
1396         struct ast_sorcery_object_field *object_field;
1397         struct ast_variable *head = NULL;
1398         struct ast_variable *tail = NULL;
1399
1400         if (!object_type) {
1401                 return NULL;
1402         }
1403
1404         i = ao2_iterator_init(object_type->fields, 0);
1405
1406         for (; (object_field = ao2_iterator_next(&i)); ao2_ref(object_field, -1)) {
1407                 struct ast_variable *tmp;
1408
1409                 switch (flags) {
1410                 case AST_HANDLER_PREFER_LIST:
1411                         if ((tmp = get_multiple_fields_as_var_list(object, object_field)) ||
1412                                 (tmp = get_single_field_as_var_list(object, object_field))) {
1413                                 break;
1414                         }
1415                         continue;
1416                 case AST_HANDLER_PREFER_STRING:
1417                         if ((tmp = get_single_field_as_var_list(object, object_field)) ||
1418                                 (tmp = get_multiple_fields_as_var_list(object, object_field))) {
1419                                 break;
1420                         }
1421                         continue;
1422                 case AST_HANDLER_ONLY_LIST:
1423                         if ((tmp = get_multiple_fields_as_var_list(object, object_field))) {
1424                                 break;
1425                         }
1426                         continue;
1427                 case AST_HANDLER_ONLY_STRING:
1428                         if ((tmp = get_single_field_as_var_list(object, object_field))) {
1429                                 break;
1430                         }
1431                         continue;
1432                 default:
1433                         continue;
1434                 }
1435
1436                 tail = ast_variable_list_append_hint(&head, tail, tmp);
1437         }
1438
1439         ao2_iterator_destroy(&i);
1440
1441         return head;
1442 }
1443
1444 struct ast_json *ast_sorcery_objectset_json_create(const struct ast_sorcery *sorcery, const void *object)
1445 {
1446         const struct ast_sorcery_object_details *details = object;
1447         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1448         struct ao2_iterator i;
1449         struct ast_sorcery_object_field *object_field;
1450         struct ast_json *json = ast_json_object_create();
1451         int res = 0;
1452
1453         if (!object_type || !json) {
1454                 return NULL;
1455         }
1456
1457         i = ao2_iterator_init(object_type->fields, 0);
1458
1459         for (; !res && (object_field = ao2_iterator_next(&i)); ao2_ref(object_field, -1)) {
1460                 if (object_field->multiple_handler) {
1461                         struct ast_variable *tmp = NULL;
1462                         struct ast_variable *field;
1463
1464                         if ((res = object_field->multiple_handler(object, &tmp))) {
1465                                 ast_variables_destroy(tmp);
1466                                 ao2_ref(object_field, -1);
1467                                 break;
1468                         }
1469
1470                         for (field = tmp; field; field = field->next) {
1471                                 struct ast_json *value = ast_json_string_create(field->value);
1472
1473                                 if (!value || ast_json_object_set(json, field->name, value)) {
1474                                         res = -1;
1475                                         break;
1476                                 }
1477                         }
1478
1479                         ast_variables_destroy(tmp);
1480                 } else if (object_field->handler) {
1481                         char *buf = NULL;
1482                         struct ast_json *value = NULL;
1483
1484                         if ((res = object_field->handler(object, object_field->args, &buf))
1485                                 || !(value = ast_json_string_create(buf))
1486                                 || ast_json_object_set(json, object_field->name, value)) {
1487                                 res = -1;
1488                         }
1489
1490                         ast_free(buf);
1491                 } else {
1492                         continue;
1493                 }
1494         }
1495
1496         ao2_iterator_destroy(&i);
1497
1498         /* If any error occurs we destroy the JSON object so a partial objectset is not returned */
1499         if (res) {
1500                 ast_json_unref(json);
1501                 json = NULL;
1502         }
1503
1504         return json;
1505 }
1506
1507 int ast_sorcery_objectset_apply(const struct ast_sorcery *sorcery, void *object, struct ast_variable *objectset)
1508 {
1509         const struct ast_sorcery_object_details *details = object;
1510         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1511         RAII_VAR(struct ast_variable *, transformed, NULL, ast_variables_destroy);
1512         struct ast_variable *field;
1513         int res = 0;
1514
1515         if (!object_type) {
1516                 return -1;
1517         }
1518
1519         if (object_type->transform && (transformed = object_type->transform(objectset))) {
1520                 field = transformed;
1521         } else {
1522                 field = objectset;
1523         }
1524
1525         for (; field; field = field->next) {
1526                 if ((res = aco_process_var(&object_type->type, details->object->id, field, object))) {
1527                         break;
1528                 }
1529         }
1530
1531         if (!res && object_type->apply) {
1532                 res = object_type->apply(sorcery, object);
1533         }
1534
1535         return res;
1536 }
1537
1538 int ast_sorcery_changeset_create(const struct ast_variable *original, const struct ast_variable *modified, struct ast_variable **changes)
1539 {
1540         const struct ast_variable *field;
1541         int res = 0;
1542
1543         *changes = NULL;
1544
1545         /* Unless the ast_variable list changes when examined... it can't differ from itself */
1546         if (original == modified) {
1547                 return 0;
1548         }
1549
1550         for (field = modified; field; field = field->next) {
1551                 const char *old_value = ast_variable_find_in_list(original, field->name);
1552
1553                 if (!old_value || strcmp(old_value, field->value)) {
1554                         struct ast_variable *tmp;
1555
1556                         if (!(tmp = ast_variable_new(field->name, field->value, ""))) {
1557                                 res = -1;
1558                                 break;
1559                         }
1560
1561                         tmp->next = *changes;
1562                         *changes = tmp;
1563                 }
1564         }
1565
1566         /* If an error occurred do not return a partial changeset */
1567         if (res) {
1568                 ast_variables_destroy(*changes);
1569                 *changes = NULL;
1570         }
1571
1572         return res;
1573 }
1574
1575 static void sorcery_object_destructor(void *object)
1576 {
1577         struct ast_sorcery_object_details *details = object;
1578
1579         if (details->object->destructor) {
1580                 details->object->destructor(object);
1581         }
1582
1583         ast_variables_destroy(details->object->extended);
1584         ast_free(details->object->id);
1585 }
1586
1587 void *ast_sorcery_generic_alloc(size_t size, ao2_destructor_fn destructor)
1588 {
1589         void *object = ao2_alloc_options(size + sizeof(struct ast_sorcery_object), sorcery_object_destructor, AO2_ALLOC_OPT_LOCK_NOLOCK);
1590         struct ast_sorcery_object_details *details = object;
1591
1592         if (!object) {
1593                 return NULL;
1594         }
1595
1596         details->object = object + size;
1597         details->object->destructor = destructor;
1598
1599         return object;
1600 }
1601
1602 void *ast_sorcery_alloc(const struct ast_sorcery *sorcery, const char *type, const char *id)
1603 {
1604         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1605         struct ast_sorcery_object_details *details;
1606
1607         if (!object_type || !object_type->type.item_alloc ||
1608                 !(details = object_type->type.item_alloc(id))) {
1609                 return NULL;
1610         }
1611
1612         if (ast_strlen_zero(id)) {
1613                 char uuid[AST_UUID_STR_LEN];
1614
1615                 ast_uuid_generate_str(uuid, sizeof(uuid));
1616                 details->object->id = ast_strdup(uuid);
1617         } else {
1618                 details->object->id = ast_strdup(id);
1619         }
1620
1621         ast_copy_string(details->object->type, type, sizeof(details->object->type));
1622
1623         if (aco_set_defaults(&object_type->type, id, details)) {
1624                 ao2_ref(details, -1);
1625                 return NULL;
1626         }
1627
1628         return details;
1629 }
1630
1631 void *ast_sorcery_copy(const struct ast_sorcery *sorcery, const void *object)
1632 {
1633         const struct ast_sorcery_object_details *details = object;
1634         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1635         struct ast_sorcery_object_details *copy = ast_sorcery_alloc(sorcery, details->object->type, details->object->id);
1636         RAII_VAR(struct ast_variable *, objectset, NULL, ast_variables_destroy);
1637         int res = 0;
1638
1639         if (!copy) {
1640                 return NULL;
1641         } else if (object_type->copy) {
1642                 res = object_type->copy(object, copy);
1643         } else if ((objectset = ast_sorcery_objectset_create(sorcery, object))) {
1644                 res = ast_sorcery_objectset_apply(sorcery, copy, objectset);
1645         } else {
1646                 /* No native copy available and could not create an objectset, this copy has failed */
1647                 res = -1;
1648         }
1649
1650         if (res) {
1651                 ao2_cleanup(copy);
1652                 copy = NULL;
1653         }
1654
1655         return copy;
1656 }
1657
1658 int ast_sorcery_diff(const struct ast_sorcery *sorcery, const void *original, const void *modified, struct ast_variable **changes)
1659 {
1660         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, ast_sorcery_object_get_type(original), OBJ_KEY), ao2_cleanup);
1661
1662         *changes = NULL;
1663
1664         if (strcmp(ast_sorcery_object_get_type(original), ast_sorcery_object_get_type(modified))) {
1665                 return -1;
1666         }
1667
1668         if (original == modified) {
1669                 return 0;
1670         } else if (!object_type->diff) {
1671                 RAII_VAR(struct ast_variable *, objectset1, NULL, ast_variables_destroy);
1672                 RAII_VAR(struct ast_variable *, objectset2, NULL, ast_variables_destroy);
1673
1674                 objectset1 = ast_sorcery_objectset_create(sorcery, original);
1675                 objectset2 = ast_sorcery_objectset_create(sorcery, modified);
1676
1677                 return ast_sorcery_changeset_create(objectset1, objectset2, changes);
1678         } else {
1679                 return object_type->diff(original, modified, changes);
1680         }
1681 }
1682
1683 /*! \brief Structure used when calling create, update, or delete */
1684 struct sorcery_details {
1685         /*! \brief Pointer to the sorcery instance */
1686         const struct ast_sorcery *sorcery;
1687         /*! \brief Pointer to the object itself */
1688         void *obj;
1689 };
1690
1691 /*! \brief Internal function used to create an object in caching wizards */
1692 static int sorcery_cache_create(void *obj, void *arg, int flags)
1693 {
1694         const struct ast_sorcery_object_wizard *object_wizard = obj;
1695         const struct sorcery_details *details = arg;
1696
1697         if (!object_wizard->caching || !object_wizard->wizard->callbacks.create) {
1698                 return 0;
1699         }
1700
1701         object_wizard->wizard->callbacks.create(details->sorcery, object_wizard->data, details->obj);
1702
1703         return 0;
1704 }
1705
1706 void *ast_sorcery_retrieve_by_id(const struct ast_sorcery *sorcery, const char *type, const char *id)
1707 {
1708         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1709         void *object = NULL;
1710         struct ao2_iterator i;
1711         struct ast_sorcery_object_wizard *wizard;
1712         unsigned int cached = 0;
1713
1714         if (!object_type || ast_strlen_zero(id)) {
1715                 return NULL;
1716         }
1717
1718         i = ao2_iterator_init(object_type->wizards, 0);
1719         for (; (wizard = ao2_iterator_next(&i)); ao2_ref(wizard, -1)) {
1720                 if (wizard->wizard->callbacks.retrieve_id &&
1721                         !(object = wizard->wizard->callbacks.retrieve_id(sorcery, wizard->data, object_type->name, id))) {
1722                         continue;
1723                 }
1724
1725                 cached = wizard->caching;
1726
1727                 ao2_ref(wizard, -1);
1728                 break;
1729         }
1730         ao2_iterator_destroy(&i);
1731
1732         if (!cached && object) {
1733                 ao2_callback(object_type->wizards, 0, sorcery_cache_create, object);
1734         }
1735
1736         return object;
1737 }
1738
1739 void *ast_sorcery_retrieve_by_fields(const struct ast_sorcery *sorcery, const char *type, unsigned int flags, struct ast_variable *fields)
1740 {
1741         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1742         void *object = NULL;
1743         struct ao2_iterator i;
1744         struct ast_sorcery_object_wizard *wizard;
1745         unsigned int cached = 0;
1746
1747         if (!object_type) {
1748                 return NULL;
1749         }
1750
1751         /* If returning multiple objects create a container to store them in */
1752         if ((flags & AST_RETRIEVE_FLAG_MULTIPLE)) {
1753                 if (!(object = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_NOLOCK, 1, NULL, NULL))) {
1754                         return NULL;
1755                 }
1756         }
1757
1758         /* Inquire with the available wizards for retrieval */
1759         i = ao2_iterator_init(object_type->wizards, 0);
1760         for (; (wizard = ao2_iterator_next(&i)); ao2_ref(wizard, -1)) {
1761                 if ((flags & AST_RETRIEVE_FLAG_MULTIPLE)) {
1762                         if (wizard->wizard->callbacks.retrieve_multiple) {
1763                                 wizard->wizard->callbacks.retrieve_multiple(sorcery, wizard->data, object_type->name, object, fields);
1764                         }
1765                 } else if (fields && wizard->wizard->callbacks.retrieve_fields) {
1766                         if (wizard->wizard->callbacks.retrieve_fields) {
1767                                 object = wizard->wizard->callbacks.retrieve_fields(sorcery, wizard->data, object_type->name, fields);
1768                         }
1769                 }
1770
1771                 if ((flags & AST_RETRIEVE_FLAG_MULTIPLE) || !object) {
1772                         continue;
1773                 }
1774
1775                 cached = wizard->caching;
1776
1777                 ao2_ref(wizard, -1);
1778                 break;
1779         }
1780         ao2_iterator_destroy(&i);
1781
1782         /* If we are returning a single object and it came from a non-cache source create it in any caches */
1783         if (!(flags & AST_RETRIEVE_FLAG_MULTIPLE) && !cached && object) {
1784                 ao2_callback(object_type->wizards, 0, sorcery_cache_create, object);
1785         }
1786
1787         return object;
1788 }
1789
1790 struct ao2_container *ast_sorcery_retrieve_by_regex(const struct ast_sorcery *sorcery, const char *type, const char *regex)
1791 {
1792         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
1793         struct ao2_container *objects;
1794         struct ao2_iterator i;
1795         struct ast_sorcery_object_wizard *wizard;
1796
1797         if (!object_type || !(objects = ao2_container_alloc_options(AO2_ALLOC_OPT_LOCK_NOLOCK, 1, NULL, NULL))) {
1798                 return NULL;
1799         }
1800
1801         i = ao2_iterator_init(object_type->wizards, 0);
1802         for (; (wizard = ao2_iterator_next(&i)); ao2_ref(wizard, -1)) {
1803                 if (!wizard->wizard->callbacks.retrieve_regex) {
1804                         continue;
1805                 }
1806
1807                 wizard->wizard->callbacks.retrieve_regex(sorcery, wizard->data, object_type->name, objects, regex);
1808         }
1809         ao2_iterator_destroy(&i);
1810
1811         return objects;
1812 }
1813
1814 /*! \brief Internal function which returns if the wizard has created the object */
1815 static int sorcery_wizard_create(void *obj, void *arg, int flags)
1816 {
1817         const struct ast_sorcery_object_wizard *object_wizard = obj;
1818         const struct sorcery_details *details = arg;
1819
1820         if (!object_wizard->wizard->callbacks.create) {
1821                 ast_assert(0);
1822                 ast_log(LOG_ERROR, "Sorcery wizard '%s' doesn't contain a 'create' virtual function.\n",
1823                         object_wizard->wizard->callbacks.name);
1824                 return 0;
1825         }
1826         return (!object_wizard->caching && !object_wizard->wizard->callbacks.create(details->sorcery, object_wizard->data, details->obj)) ? CMP_MATCH | CMP_STOP : 0;
1827 }
1828
1829 /*! \brief Internal callback function which notifies an individual observer that an object has been created */
1830 static int sorcery_observer_notify_create(void *obj, void *arg, int flags)
1831 {
1832         const struct ast_sorcery_object_type_observer *observer = obj;
1833
1834         if (observer->callbacks->created) {
1835                 observer->callbacks->created(arg);
1836         }
1837
1838         return 0;
1839 }
1840
1841 /*! \brief Internal callback function which notifies observers that an object has been created */
1842 static int sorcery_observers_notify_create(void *data)
1843 {
1844         struct sorcery_observer_invocation *invocation = data;
1845
1846         ao2_callback(invocation->object_type->observers, OBJ_NODATA, sorcery_observer_notify_create, invocation->object);
1847         ao2_cleanup(invocation);
1848
1849         return 0;
1850 }
1851
1852 int ast_sorcery_create(const struct ast_sorcery *sorcery, void *object)
1853 {
1854         const struct ast_sorcery_object_details *details = object;
1855         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1856         RAII_VAR(struct ast_sorcery_object_wizard *, object_wizard, NULL, ao2_cleanup);
1857         struct sorcery_details sdetails = {
1858                 .sorcery = sorcery,
1859                 .obj = object,
1860         };
1861
1862         if (!object_type) {
1863                 return -1;
1864         }
1865
1866         if ((object_wizard = ao2_callback(object_type->wizards, 0, sorcery_wizard_create, &sdetails)) &&
1867                 ao2_container_count(object_type->observers)) {
1868                 struct sorcery_observer_invocation *invocation = sorcery_observer_invocation_alloc(object_type, object);
1869
1870                 if (invocation && ast_taskprocessor_push(object_type->serializer, sorcery_observers_notify_create, invocation)) {
1871                         ao2_cleanup(invocation);
1872                 }
1873         }
1874
1875         return object_wizard ? 0 : -1;
1876 }
1877
1878 /*! \brief Internal callback function which notifies an individual observer that an object has been updated */
1879 static int sorcery_observer_notify_update(void *obj, void *arg, int flags)
1880 {
1881         const struct ast_sorcery_object_type_observer *observer = obj;
1882
1883         if (observer->callbacks->updated) {
1884                 observer->callbacks->updated(arg);
1885         }
1886
1887         return 0;
1888 }
1889
1890 /*! \brief Internal callback function which notifies observers that an object has been updated */
1891 static int sorcery_observers_notify_update(void *data)
1892 {
1893         struct sorcery_observer_invocation *invocation = data;
1894
1895         ao2_callback(invocation->object_type->observers, OBJ_NODATA, sorcery_observer_notify_update, invocation->object);
1896         ao2_cleanup(invocation);
1897
1898         return 0;
1899 }
1900
1901 /*! \brief Internal function which returns if a wizard has updated the object */
1902 static int sorcery_wizard_update(void *obj, void *arg, int flags)
1903 {
1904         const struct ast_sorcery_object_wizard *object_wizard = obj;
1905         const struct sorcery_details *details = arg;
1906
1907         return (object_wizard->wizard->callbacks.update && !object_wizard->wizard->callbacks.update(details->sorcery, object_wizard->data, details->obj) &&
1908                 !object_wizard->caching) ? CMP_MATCH | CMP_STOP : 0;
1909 }
1910
1911 int ast_sorcery_update(const struct ast_sorcery *sorcery, void *object)
1912 {
1913         const struct ast_sorcery_object_details *details = object;
1914         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1915         RAII_VAR(struct ast_sorcery_object_wizard *, object_wizard, NULL, ao2_cleanup);
1916         struct sorcery_details sdetails = {
1917                 .sorcery = sorcery,
1918                 .obj = object,
1919         };
1920
1921         if (!object_type) {
1922                 return -1;
1923         }
1924
1925         if ((object_wizard = ao2_callback(object_type->wizards, 0, sorcery_wizard_update, &sdetails)) &&
1926                 ao2_container_count(object_type->observers)) {
1927                 struct sorcery_observer_invocation *invocation = sorcery_observer_invocation_alloc(object_type, object);
1928
1929                 if (invocation && ast_taskprocessor_push(object_type->serializer, sorcery_observers_notify_update, invocation)) {
1930                         ao2_cleanup(invocation);
1931                 }
1932         }
1933
1934         return object_wizard ? 0 : -1;
1935 }
1936
1937 /*! \brief Internal callback function which notifies an individual observer that an object has been deleted */
1938 static int sorcery_observer_notify_delete(void *obj, void *arg, int flags)
1939 {
1940         const struct ast_sorcery_object_type_observer *observer = obj;
1941
1942         if (observer->callbacks->deleted) {
1943                 observer->callbacks->deleted(arg);
1944         }
1945
1946         return 0;
1947 }
1948
1949 /*! \brief Internal callback function which notifies observers that an object has been deleted */
1950 static int sorcery_observers_notify_delete(void *data)
1951 {
1952         struct sorcery_observer_invocation *invocation = data;
1953
1954         ao2_callback(invocation->object_type->observers, OBJ_NODATA, sorcery_observer_notify_delete, invocation->object);
1955         ao2_cleanup(invocation);
1956
1957         return 0;
1958 }
1959
1960 /*! \brief Internal function which returns if a wizard has deleted the object */
1961 static int sorcery_wizard_delete(void *obj, void *arg, int flags)
1962 {
1963         const struct ast_sorcery_object_wizard *object_wizard = obj;
1964         const struct sorcery_details *details = arg;
1965
1966         return (object_wizard->wizard->callbacks.delete && !object_wizard->wizard->callbacks.delete(details->sorcery, object_wizard->data, details->obj) &&
1967                 !object_wizard->caching) ? CMP_MATCH | CMP_STOP : 0;
1968 }
1969
1970 int ast_sorcery_delete(const struct ast_sorcery *sorcery, void *object)
1971 {
1972         const struct ast_sorcery_object_details *details = object;
1973         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, details->object->type, OBJ_KEY), ao2_cleanup);
1974         RAII_VAR(struct ast_sorcery_object_wizard *, object_wizard, NULL, ao2_cleanup);
1975         struct sorcery_details sdetails = {
1976                 .sorcery = sorcery,
1977                 .obj = object,
1978         };
1979
1980         if (!object_type) {
1981                 return -1;
1982         }
1983
1984         if ((object_wizard = ao2_callback(object_type->wizards, 0, sorcery_wizard_delete, &sdetails)) &&
1985                 ao2_container_count(object_type->observers)) {
1986                 struct sorcery_observer_invocation *invocation = sorcery_observer_invocation_alloc(object_type, object);
1987
1988                 if (invocation && ast_taskprocessor_push(object_type->serializer, sorcery_observers_notify_delete, invocation)) {
1989                         ao2_cleanup(invocation);
1990                 }
1991         }
1992
1993         return object_wizard ? 0 : -1;
1994 }
1995
1996 void ast_sorcery_unref(struct ast_sorcery *sorcery)
1997 {
1998         if (sorcery) {
1999                 /* One ref for what we just released, the other for the instances container. */
2000                 ao2_wrlock(instances);
2001                 if (ao2_ref(sorcery, -1) == 2) {
2002                         ao2_unlink_flags(instances, sorcery, OBJ_NOLOCK);
2003                 }
2004                 ao2_unlock(instances);
2005         }
2006 }
2007
2008 const char *ast_sorcery_object_get_id(const void *object)
2009 {
2010         const struct ast_sorcery_object_details *details = object;
2011         return details->object->id;
2012 }
2013
2014 const char *ast_sorcery_object_get_type(const void *object)
2015 {
2016         const struct ast_sorcery_object_details *details = object;
2017         return details->object->type;
2018 }
2019
2020 const char *ast_sorcery_object_get_extended(const void *object, const char *name)
2021 {
2022         const struct ast_sorcery_object_details *details = object;
2023         struct ast_variable *field;
2024
2025         for (field = details->object->extended; field; field = field->next) {
2026                 if (!strcmp(field->name + 1, name)) {
2027                         return field->value;
2028                 }
2029         }
2030
2031         return NULL;
2032 }
2033
2034 int ast_sorcery_object_set_extended(const void *object, const char *name, const char *value)
2035 {
2036         RAII_VAR(struct ast_variable *, field, NULL, ast_variables_destroy);
2037         struct ast_variable *extended = ast_variable_new(name, value, ""), *previous = NULL;
2038         const struct ast_sorcery_object_details *details = object;
2039
2040         if (!extended) {
2041                 return -1;
2042         }
2043
2044         for (field = details->object->extended; field; previous = field, field = field->next) {
2045                 if (!strcmp(field->name, name)) {
2046                         if (previous) {
2047                                 previous->next = field->next;
2048                         } else {
2049                                 details->object->extended = field->next;
2050                         }
2051                         field->next = NULL;
2052                         break;
2053                 }
2054         }
2055
2056         extended->next = details->object->extended;
2057         details->object->extended = extended;
2058
2059         return 0;
2060 }
2061
2062 int ast_sorcery_observer_add(const struct ast_sorcery *sorcery, const char *type, const struct ast_sorcery_observer *callbacks)
2063 {
2064         RAII_VAR(struct ast_sorcery_object_type *, object_type, ao2_find(sorcery->types, type, OBJ_KEY), ao2_cleanup);
2065         struct ast_sorcery_object_type_observer *observer;
2066         int res;
2067
2068         if (!object_type || !callbacks) {
2069                 return -1;
2070         }
2071
2072         if (!(observer = ao2_alloc(sizeof(*observer), NULL))) {
2073                 return -1;
2074         }
2075
2076         observer->callbacks = callbacks;
2077         res = 0;
2078         if (!ao2_link(object_type->observers, observer)) {
2079                 res = -1;
2080         }
2081         ao2_ref(observer, -1);
2082
2083         return res;
2084 }
2085
2086 /*! \brief Internal callback function for removing an observer */
2087 static int sorcery_observer_remove(void *obj, void *arg, int flags)
2088 {
2089         const struct ast_sorcery_object_type_observer *observer = obj;
2090
2091         return (observer->callbacks == arg) ? CMP_MATCH | CMP_STOP : 0;
2092 }
2093
2094 void ast_sorcery_observer_remove(const struct ast_sorcery *sorcery, const char *type, const struct ast_sorcery_observer *callbacks)
2095 {
2096         RAII_VAR(struct ast_sorcery_object_type *, object_type, NULL, ao2_cleanup);
2097         struct ast_sorcery_observer *cbs = (struct ast_sorcery_observer *) callbacks;/* Remove const for traversal. */
2098
2099         if (!sorcery) {
2100                 return;
2101         }
2102         object_type = ao2_find(sorcery->types, type, OBJ_KEY);
2103         if (!object_type) {
2104                 return;
2105         }
2106
2107         ao2_callback(object_type->observers, OBJ_NODATA | OBJ_UNLINK,
2108                 sorcery_observer_remove, cbs);
2109 }
2110
2111 int ast_sorcery_object_id_sort(const void *obj, const void *arg, int flags)
2112 {
2113         const char *right_key = arg;
2114         int cmp;
2115
2116         switch (flags & OBJ_SEARCH_MASK) {
2117         case OBJ_SEARCH_OBJECT:
2118                 right_key = ast_sorcery_object_get_id(arg);
2119                 /* Fall through */
2120         case OBJ_SEARCH_KEY:
2121                 cmp = strcmp(ast_sorcery_object_get_id(obj), right_key);
2122                 break;
2123         case OBJ_SEARCH_PARTIAL_KEY:
2124                 cmp = strncmp(ast_sorcery_object_get_id(obj), right_key, strlen(right_key));
2125                 break;
2126         default:
2127                 cmp = 0;
2128                 break;
2129         }
2130         return cmp;
2131 }
2132
2133 int ast_sorcery_object_id_compare(void *obj, void *arg, int flags)
2134 {
2135         const char *right_key = arg;
2136         int cmp = 0;
2137
2138         switch (flags & OBJ_SEARCH_MASK) {
2139         case OBJ_SEARCH_OBJECT:
2140                 right_key = ast_sorcery_object_get_id(arg);
2141                 /* Fall through */
2142         case OBJ_SEARCH_KEY:
2143                 if (strcmp(ast_sorcery_object_get_id(obj), right_key) == 0) {
2144                         cmp = CMP_MATCH | CMP_STOP;
2145                 }
2146                 break;
2147         case OBJ_SEARCH_PARTIAL_KEY:
2148                 if (strncmp(ast_sorcery_object_get_id(obj), right_key, strlen(right_key)) == 0) {
2149                         cmp = CMP_MATCH;
2150                 }
2151                 break;
2152         default:
2153                 cmp = 0;
2154                 break;
2155         }
2156         return cmp;
2157 }
2158
2159 int ast_sorcery_object_id_hash(const void *obj, int flags) {
2160         if (flags & OBJ_SEARCH_OBJECT) {
2161                 return ast_str_hash(ast_sorcery_object_get_id(obj));
2162         } else if (flags & OBJ_SEARCH_KEY) {
2163                 return ast_str_hash(obj);
2164         }
2165         return -1;
2166 }
2167
2168 struct ast_sorcery_object_type *ast_sorcery_get_object_type(const struct ast_sorcery *sorcery,
2169                 const char *type)
2170 {
2171         return ao2_find(sorcery->types, type, OBJ_SEARCH_KEY);
2172 }
2173
2174 static int is_registered_cb(void *obj, void *arg, int flags)
2175 {
2176         struct ast_sorcery_object_field *object_field = obj;
2177         char *name = arg;
2178         int rc = 0;
2179
2180         if (object_field->name_regex
2181                 && !regexec(object_field->name_regex, name, 0, NULL, 0)) {
2182                 rc = CMP_MATCH | CMP_STOP;
2183         }
2184
2185         return rc;
2186 }
2187
2188 int ast_sorcery_is_object_field_registered(const struct ast_sorcery_object_type *object_type,
2189                 const char *field_name)
2190 {
2191         struct ast_sorcery_object_field *object_field;
2192         int res = 1;
2193
2194         ast_assert(object_type != NULL);
2195
2196         object_field = ao2_find(object_type->fields, field_name, OBJ_SEARCH_KEY);
2197
2198         if (!object_field) {
2199                 object_field = ao2_callback(object_type->fields, 0, is_registered_cb, (char *)field_name);
2200         }
2201
2202         if (!object_field) {
2203                 res = 0;
2204         }
2205
2206         ao2_cleanup(object_field);
2207         return res;
2208 }