Merge "res_odbc: fix missing SQL error diagnostic"
[asterisk/asterisk.git] / res / res_calendar.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2008 - 2009, Digium, Inc.
5  *
6  * Terry Wilson <twilson@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  * \brief Calendaring API
21  *
22  * \todo Support responding to a meeting invite
23  * \todo Support writing attendees
24  */
25
26 /*! \li \ref res_calendar.c uses the configuration file \ref calendar.conf
27  * \addtogroup configuration_file Configuration Files
28  */
29
30 /*!
31  * \page calendar.conf calendar.conf
32  * \verbinclude calendar.conf.sample
33  */
34
35 /*** MODULEINFO
36         <support_level>extended</support_level>
37  ***/
38
39 #include "asterisk.h"
40
41 #include "asterisk/_private.h"
42 #include "asterisk/channel.h"
43 #include "asterisk/calendar.h"
44 #include "asterisk/utils.h"
45 #include "asterisk/astobj2.h"
46 #include "asterisk/module.h"
47 #include "asterisk/config.h"
48 #include "asterisk/channel.h"
49 #include "asterisk/devicestate.h"
50 #include "asterisk/linkedlists.h"
51 #include "asterisk/sched.h"
52 #include "asterisk/dial.h"
53 #include "asterisk/cli.h"
54 #include "asterisk/pbx.h"
55 #include "asterisk/app.h"
56 #include "asterisk/format_cache.h"
57
58 /*** DOCUMENTATION
59         <function name="CALENDAR_BUSY" language="en_US">
60                 <synopsis>
61                         Determine if the calendar is marked busy at this time.
62                 </synopsis>
63                 <syntax>
64                         <parameter name="calendar" required="true" />
65                 </syntax>
66                 <description>
67                         <para>Check the specified calendar's current busy status.</para>
68                 </description>
69                 <see-also>
70                         <ref type="function">CALENDAR_EVENT</ref>
71                         <ref type="function">CALENDAR_QUERY</ref>
72                         <ref type="function">CALENDAR_QUERY_RESULT</ref>
73                         <ref type="function">CALENDAR_WRITE</ref>
74                 </see-also>
75         </function>
76         <function name="CALENDAR_EVENT" language="en_US">
77                 <synopsis>
78                         Get calendar event notification data from a notification call.
79                 </synopsis>
80                 <syntax>
81                         <parameter name="field" required="true">
82                                 <enumlist>
83                                         <enum name="summary"><para>The VEVENT SUMMARY property or Exchange event 'subject'</para></enum>
84                                         <enum name="description"><para>The text description of the event</para></enum>
85                                         <enum name="organizer"><para>The organizer of the event</para></enum>
86                                         <enum name="location"><para>The location of the eventt</para></enum>
87                                         <enum name="categories"><para>The categories of the event</para></enum>
88                                         <enum name="priority"><para>The priority of the event</para></enum>
89                                         <enum name="calendar"><para>The name of the calendar associated with the event</para></enum>
90                                         <enum name="uid"><para>The unique identifier for this event</para></enum>
91                                         <enum name="start"><para>The start time of the event</para></enum>
92                                         <enum name="end"><para>The end time of the event</para></enum>
93                                         <enum name="busystate"><para>The busy state of the event 0=FREE, 1=TENTATIVE, 2=BUSY</para></enum>
94                                 </enumlist>
95                         </parameter>
96                 </syntax>
97                 <description>
98                         <para>Whenever a calendar event notification call is made, the event data
99                         may be accessed with this function.</para>
100                 </description>
101                 <see-also>
102                         <ref type="function">CALENDAR_BUSY</ref>
103                         <ref type="function">CALENDAR_QUERY</ref>
104                         <ref type="function">CALENDAR_QUERY_RESULT</ref>
105                         <ref type="function">CALENDAR_WRITE</ref>
106                 </see-also>
107         </function>
108         <function name="CALENDAR_QUERY" language="en_US">
109                 <synopsis>Query a calendar server and store the data on a channel
110                 </synopsis>
111                 <syntax>
112                         <parameter name="calendar" required="true">
113                                 <para>The calendar that should be queried</para>
114                         </parameter>
115                         <parameter name="start" required="false">
116                                 <para>The start time of the query (in seconds since epoch)</para>
117                         </parameter>
118                         <parameter name="end" required="false">
119                                 <para>The end time of the query (in seconds since epoch)</para>
120                         </parameter>
121                 </syntax>
122                 <description>
123                         <para>Get a list of events in the currently accessible timeframe of the <replaceable>calendar</replaceable>
124                         The function returns the id for accessing the result with CALENDAR_QUERY_RESULT()</para>
125                 </description>
126                 <see-also>
127                         <ref type="function">CALENDAR_BUSY</ref>
128                         <ref type="function">CALENDAR_EVENT</ref>
129                         <ref type="function">CALENDAR_QUERY_RESULT</ref>
130                         <ref type="function">CALENDAR_WRITE</ref>
131                 </see-also>
132         </function>
133         <function name="CALENDAR_QUERY_RESULT" language="en_US">
134                 <synopsis>
135                         Retrieve data from a previously run CALENDAR_QUERY() call
136                 </synopsis>
137                 <syntax>
138                         <parameter name="id" required="true">
139                                 <para>The query ID returned by <literal>CALENDAR_QUERY</literal></para>
140                         </parameter>
141                         <parameter name="field" required="true">
142                                 <enumlist>
143                                         <enum name="getnum"><para>number of events occurring during time range</para></enum>
144                                         <enum name="summary"><para>A summary of the event</para></enum>
145                                         <enum name="description"><para>The full event description</para></enum>
146                                         <enum name="organizer"><para>The event organizer</para></enum>
147                                         <enum name="location"><para>The event location</para></enum>
148                                         <enum name="categories"><para>The categories of the event</para></enum>
149                                         <enum name="priority"><para>The priority of the event</para></enum>
150                                         <enum name="calendar"><para>The name of the calendar associted with the event</para></enum>
151                                         <enum name="uid"><para>The unique identifier for the event</para></enum>
152                                         <enum name="start"><para>The start time of the event (in seconds since epoch)</para></enum>
153                                         <enum name="end"><para>The end time of the event (in seconds since epoch)</para></enum>
154                                         <enum name="busystate"><para>The busy status of the event 0=FREE, 1=TENTATIVE, 2=BUSY</para></enum>
155                                 </enumlist>
156                         </parameter>
157                         <parameter name="entry" required="false" default="1">
158                                 <para>Return data from a specific event returned by the query</para>
159                         </parameter>
160                 </syntax>
161                 <description>
162                         <para>After running CALENDAR_QUERY and getting a result <replaceable>id</replaceable>, calling
163                         <literal>CALENDAR_QUERY</literal> with that <replaceable>id</replaceable> and a <replaceable>field</replaceable>
164                         will return the data for that field. If multiple events matched the query, and <replaceable>entry</replaceable>
165                         is provided, information from that event will be returned.</para>
166                 </description>
167                 <see-also>
168                         <ref type="function">CALENDAR_BUSY</ref>
169                         <ref type="function">CALENDAR_EVENT</ref>
170                         <ref type="function">CALENDAR_QUERY</ref>
171                         <ref type="function">CALENDAR_WRITE</ref>
172                 </see-also>
173         </function>
174         <function name="CALENDAR_WRITE" language="en_US">
175                 <synopsis>Write an event to a calendar</synopsis>
176                 <syntax>
177                         <parameter name="calendar" required="true">
178                                 <para>The calendar to write to</para>
179                         </parameter>
180                         <parameter name="field" multiple="true" required="true">
181                                 <enumlist>
182                                         <enum name="summary"><para>A summary of the event</para></enum>
183                                         <enum name="description"><para>The full event description</para></enum>
184                                         <enum name="organizer"><para>The event organizer</para></enum>
185                                         <enum name="location"><para>The event location</para></enum>
186                                         <enum name="categories"><para>The categories of the event</para></enum>
187                                         <enum name="priority"><para>The priority of the event</para></enum>
188                                         <enum name="uid"><para>The unique identifier for the event</para></enum>
189                                         <enum name="start"><para>The start time of the event (in seconds since epoch)</para></enum>
190                                         <enum name="end"><para>The end time of the event (in seconds since epoch)</para></enum>
191                                         <enum name="busystate"><para>The busy status of the event 0=FREE, 1=TENTATIVE, 2=BUSY</para></enum>
192                                 </enumlist>
193                         </parameter>
194                 </syntax>
195                 <description>
196                         <para>Example: CALENDAR_WRITE(calendar,field1,field2,field3)=val1,val2,val3</para>
197                         <para>The field and value arguments can easily be set/passed using the HASHKEYS() and HASH() functions</para>
198                         <variablelist>
199                                 <variable name="CALENDAR_SUCCESS">
200                                         <para>The status of the write operation to the calendar</para>
201                                         <value name="1" >
202                                                 The event was successfully written to the calendar.
203                                         </value>
204                                         <value name="0" >
205                                                 The event was not written to the calendar due to network issues, permissions, etc.
206                                         </value>
207                                 </variable>
208                         </variablelist>
209
210                 </description>
211                 <see-also>
212                         <ref type="function">CALENDAR_BUSY</ref>
213                         <ref type="function">CALENDAR_EVENT</ref>
214                         <ref type="function">CALENDAR_QUERY</ref>
215                         <ref type="function">CALENDAR_QUERY_RESULT</ref>
216                 </see-also>
217         </function>
218
219 ***/
220 #define CALENDAR_BUCKETS 19
221
222 static struct ao2_container *calendars;
223 static struct ast_sched_context *sched;
224 static pthread_t refresh_thread = AST_PTHREADT_NULL;
225 static ast_mutex_t refreshlock;
226 static ast_cond_t refresh_condition;
227 static ast_mutex_t reloadlock;
228 static int module_unloading;
229
230 static void event_notification_destroy(void *data);
231 static void *event_notification_duplicate(void *data);
232 static void eventlist_destroy(void *data);
233 static void *eventlist_duplicate(void *data);
234
235 static const struct ast_datastore_info event_notification_datastore = {
236         .type = "EventNotification",
237         .destroy = event_notification_destroy,
238         .duplicate = event_notification_duplicate,
239 };
240
241 static const struct ast_datastore_info eventlist_datastore_info = {
242         .type = "CalendarEventList",
243         .destroy = eventlist_destroy,
244         .duplicate = eventlist_duplicate,
245 };
246
247 struct evententry {
248         struct ast_calendar_event *event;
249         AST_LIST_ENTRY(evententry) list;
250 };
251
252 static AST_LIST_HEAD_STATIC(techs, ast_calendar_tech);
253 AST_LIST_HEAD_NOLOCK(eventlist, evententry); /* define the type */
254
255 static struct ast_config *calendar_config;
256 AST_RWLOCK_DEFINE_STATIC(config_lock);
257
258 const struct ast_config *ast_calendar_config_acquire(void)
259 {
260         ast_rwlock_rdlock(&config_lock);
261
262         if (!calendar_config) {
263                 ast_rwlock_unlock(&config_lock);
264                 return NULL;
265         }
266
267         return calendar_config;
268 }
269
270 void ast_calendar_config_release(void)
271 {
272         ast_rwlock_unlock(&config_lock);
273 }
274
275 static struct ast_calendar *unref_calendar(struct ast_calendar *cal)
276 {
277         ao2_ref(cal, -1);
278         return NULL;
279 }
280
281 static int calendar_hash_fn(const void *obj, const int flags)
282 {
283         const struct ast_calendar *cal = obj;
284         return ast_str_case_hash(cal->name);
285 }
286
287 static int calendar_cmp_fn(void *obj, void *arg, int flags)
288 {
289         const struct ast_calendar *one = obj, *two = arg;
290         return !strcasecmp(one->name, two->name) ? CMP_MATCH | CMP_STOP: 0;
291 }
292
293 static struct ast_calendar *find_calendar(const char *name)
294 {
295         struct ast_calendar tmp = {
296                 .name = name,
297         };
298         return ao2_find(calendars, &tmp, OBJ_POINTER);
299 }
300
301 static int event_hash_fn(const void *obj, const int flags)
302 {
303         const struct ast_calendar_event *event = obj;
304         return ast_str_hash(event->uid);
305 }
306
307 static int event_cmp_fn(void *obj, void *arg, int flags)
308 {
309         const struct ast_calendar_event *one = obj, *two = arg;
310         return !strcmp(one->uid, two->uid) ? CMP_MATCH | CMP_STOP : 0;
311 }
312
313 static struct ast_calendar_event *find_event(struct ao2_container *events, const char *uid)
314 {
315         struct ast_calendar_event tmp = {
316                 .uid = uid,
317         };
318         return ao2_find(events, &tmp, OBJ_POINTER);
319 }
320
321 struct ast_calendar_event *ast_calendar_unref_event(struct ast_calendar_event *event)
322 {
323         ao2_ref(event, -1);
324         return NULL;
325 }
326
327 static void calendar_destructor(void *obj)
328 {
329         struct ast_calendar *cal = obj;
330
331         ast_debug(3, "Destroying calendar %s\n", cal->name);
332
333         ao2_lock(cal);
334         cal->unloading = 1;
335         ast_cond_signal(&cal->unload);
336         pthread_join(cal->thread, NULL);
337         if (cal->tech_pvt) {
338                 cal->tech_pvt = cal->tech->unref_calendar(cal->tech_pvt);
339         }
340         ast_calendar_clear_events(cal);
341         ast_string_field_free_memory(cal);
342         ast_variables_destroy(cal->vars);
343         ao2_ref(cal->events, -1);
344         ao2_unlock(cal);
345 }
346
347 static void eventlist_destructor(void *obj)
348 {
349         struct eventlist *events = obj;
350         struct evententry *entry;
351
352         while ((entry = AST_LIST_REMOVE_HEAD(events, list))) {
353                 ao2_ref(entry->event, -1);
354                 ast_free(entry);
355         }
356 }
357
358 static int calendar_busy_callback(void *obj, void *arg, int flags)
359 {
360         struct ast_calendar_event *event = obj;
361         int *is_busy = arg;
362         struct timeval tv = ast_tvnow();
363
364         if (tv.tv_sec >= event->start && tv.tv_sec <= event->end && event->busy_state > AST_CALENDAR_BS_FREE) {
365                 *is_busy = 1;
366                 return CMP_STOP;
367         }
368
369         return 0;
370 }
371
372 static int calendar_is_busy(struct ast_calendar *cal)
373 {
374         int is_busy = 0;
375
376         ao2_callback(cal->events, OBJ_NODATA, calendar_busy_callback, &is_busy);
377
378         return is_busy;
379 }
380
381 static enum ast_device_state calendarstate(const char *data)
382 {
383         enum ast_device_state state;
384         struct ast_calendar *cal;
385
386         if (ast_strlen_zero(data) || (!(cal = find_calendar(data)))) {
387                 return AST_DEVICE_INVALID;
388         }
389
390         if (cal->tech->is_busy) {
391                 state = cal->tech->is_busy(cal) ? AST_DEVICE_INUSE : AST_DEVICE_NOT_INUSE;
392         } else {
393                 state = calendar_is_busy(cal) ? AST_DEVICE_INUSE : AST_DEVICE_NOT_INUSE;
394         }
395
396         cal = unref_calendar(cal);
397         return state;
398 }
399
400 static struct ast_calendar *build_calendar(struct ast_config *cfg, const char *cat, const struct ast_calendar_tech *tech)
401 {
402         struct ast_calendar *cal;
403         struct ast_variable *v, *last = NULL;
404         int new_calendar = 0;
405
406         cal = find_calendar(cat);
407         if (cal && cal->fetch_again_at_reload) {
408                 /** Create new calendar, old will be removed during reload */
409                 cal = unref_calendar(cal);
410         }
411         if (!cal) {
412                 new_calendar = 1;
413                 if (!(cal = ao2_alloc(sizeof(*cal), calendar_destructor))) {
414                         ast_log(LOG_ERROR, "Could not allocate calendar structure. Stopping.\n");
415                         return NULL;
416                 }
417
418                 if (!(cal->events = ao2_container_alloc(CALENDAR_BUCKETS, event_hash_fn, event_cmp_fn))) {
419                         ast_log(LOG_ERROR, "Could not allocate events container for %s\n", cat);
420                         cal = unref_calendar(cal);
421                         return NULL;
422                 }
423
424                 if (ast_string_field_init(cal, 32)) {
425                         ast_log(LOG_ERROR, "Couldn't create string fields for %s\n", cat);
426                         cal = unref_calendar(cal);
427                         return NULL;
428                 }
429         } else {
430                 cal->pending_deletion = 0;
431         }
432
433         ast_string_field_set(cal, name, cat);
434         cal->tech = tech;
435
436         cal->refresh = 3600;
437         cal->timeframe = 60;
438         cal->notify_waittime = 30000;
439         cal->fetch_again_at_reload = 0;
440
441         for (v = ast_variable_browse(cfg, cat); v; v = v->next) {
442                 if (!strcasecmp(v->name, "autoreminder")) {
443                         cal->autoreminder = atoi(v->value);
444                 } else if (!strcasecmp(v->name, "channel")) {
445                         ast_string_field_set(cal, notify_channel, v->value);
446                 } else if (!strcasecmp(v->name, "context")) {
447                         ast_string_field_set(cal, notify_context, v->value);
448                 } else if (!strcasecmp(v->name, "extension")) {
449                         ast_string_field_set(cal, notify_extension, v->value);
450                 } else if (!strcasecmp(v->name, "waittime")) {
451                         int i = atoi(v->value);
452                         if (i > 0) {
453                                 cal->notify_waittime = 1000 * i;
454                         }
455                 } else if (!strcasecmp(v->name, "app")) {
456                         ast_string_field_set(cal, notify_app, v->value);
457                 } else if (!strcasecmp(v->name, "appdata")) {
458                         ast_string_field_set(cal, notify_appdata, v->value);
459                 } else if (!strcasecmp(v->name, "refresh")) {
460                         cal->refresh = atoi(v->value);
461                 } else if (!strcasecmp(v->name, "fetch_again_at_reload")) {
462                         cal->fetch_again_at_reload = ast_true(v->value);
463                 } else if (!strcasecmp(v->name, "timeframe")) {
464                         cal->timeframe = atoi(v->value);
465                 } else if (!strcasecmp(v->name, "setvar")) {
466                         char *name, *value;
467                         struct ast_variable *var;
468
469                         if ((name = (value = ast_strdup(v->value)))) {
470                                 strsep(&value, "=");
471                                 if (value) {
472                                         if ((var = ast_variable_new(ast_strip(name), ast_strip(value), ""))) {
473                                                 if (last) {
474                                                         last->next = var;
475                                                 } else {
476                                                         cal->vars = var;
477                                                 }
478                                                 last = var;
479                                         }
480                                 } else {
481                                         ast_log(LOG_WARNING, "Malformed argument. Should be '%s: variable=value'\n", v->name);
482                                 }
483                                 ast_free(name);
484                         }
485                 }
486         }
487
488         if (cal->autoreminder && ast_strlen_zero(cal->notify_channel)) {
489                 ast_log(LOG_WARNING,
490                                 "You have set 'autoreminder' but not 'channel' for calendar '%s.' "
491                                 "Notifications will not occur.\n",
492                                 cal->name);
493         }
494
495         if (new_calendar) {
496                 cal->thread = AST_PTHREADT_NULL;
497                 ast_cond_init(&cal->unload, NULL);
498                 ao2_link(calendars, cal);
499                 if (ast_pthread_create(&cal->thread, NULL, cal->tech->load_calendar, cal)) {
500                         /* If we start failing to create threads, go ahead and return NULL
501                          * and the tech module will be unregistered
502                          */
503                         ao2_unlink(calendars, cal);
504                         cal = unref_calendar(cal);
505                 }
506         }
507
508         return cal;
509 }
510
511 static int load_tech_calendars(struct ast_calendar_tech *tech)
512 {
513         struct ast_calendar *cal;
514         const char *cat = NULL;
515         const char *val;
516
517         if (!calendar_config) {
518                 ast_log(LOG_WARNING, "Calendar support disabled, not loading %s calendar module\n", tech->type);
519                 return -1;
520         }
521
522         ast_rwlock_wrlock(&config_lock);
523         while ((cat = ast_category_browse(calendar_config, cat))) {
524                 if (!strcasecmp(cat, "general")) {
525                         continue;
526                 }
527
528                 if (!(val = ast_variable_retrieve(calendar_config, cat, "type")) || strcasecmp(val, tech->type)) {
529                         continue;
530                 }
531
532                 /* A serious error occurred loading calendars from this tech and it should be disabled */
533                 if (!(cal = build_calendar(calendar_config, cat, tech))) {
534                         ast_calendar_unregister(tech);
535                         ast_rwlock_unlock(&config_lock);
536                         return -1;
537                 }
538
539                 cal = unref_calendar(cal);
540         }
541
542         ast_rwlock_unlock(&config_lock);
543
544         return 0;
545 }
546
547 int ast_calendar_register(struct ast_calendar_tech *tech)
548 {
549         struct ast_calendar_tech *iter;
550
551         if (!calendar_config) {
552                 ast_log(LOG_WARNING, "Calendar support disabled, not loading %s calendar module\n", tech->type);
553                 return -1;
554         }
555
556         AST_LIST_LOCK(&techs);
557         AST_LIST_TRAVERSE(&techs, iter, list) {
558                 if(!strcasecmp(tech->type, iter->type)) {
559                         ast_log(LOG_WARNING, "Already have a handler for calendar type '%s'\n", tech->type);
560                         AST_LIST_UNLOCK(&techs);
561                         return -1;
562                 }
563         }
564         AST_LIST_INSERT_HEAD(&techs, tech, list);
565         tech->user = ast_module_user_add(NULL);
566         AST_LIST_UNLOCK(&techs);
567
568         ast_verb(2, "Registered calendar type '%s' (%s)\n", tech->type, tech->description);
569
570         return load_tech_calendars(tech);
571 }
572
573 static int match_caltech_cb(void *user_data, void *arg, int flags)
574 {
575         struct ast_calendar *cal = user_data;
576         struct ast_calendar_tech *tech = arg;
577
578         if (cal->tech == tech) {
579                 return CMP_MATCH;
580         }
581
582         return 0;
583 }
584
585 void ast_calendar_unregister(struct ast_calendar_tech *tech)
586 {
587         struct ast_calendar_tech *iter;
588
589         AST_LIST_LOCK(&techs);
590         AST_LIST_TRAVERSE_SAFE_BEGIN(&techs, iter, list) {
591                 if (iter != tech) {
592                         continue;
593                 }
594
595                 ao2_callback(calendars, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, match_caltech_cb, tech);
596
597                 AST_LIST_REMOVE_CURRENT(list);
598                 ast_module_user_remove(iter->user);
599                 ast_verb(2, "Unregistered calendar type '%s'\n", tech->type);
600                 break;
601         }
602         AST_LIST_TRAVERSE_SAFE_END;
603         AST_LIST_UNLOCK(&techs);
604
605 }
606
607 static void calendar_event_destructor(void *obj)
608 {
609         struct ast_calendar_event *event = obj;
610         struct ast_calendar_attendee *attendee;
611
612         ast_debug(3, "Destroying event for calendar '%s'\n", event->owner->name);
613         ast_string_field_free_memory(event);
614         while ((attendee = AST_LIST_REMOVE_HEAD(&event->attendees, next))) {
615                 if (attendee->data) {
616                         ast_free(attendee->data);
617                 }
618                 ast_free(attendee);
619         }
620 }
621
622 /* This is only called from ao2_callbacks that are going to unref the event for us,
623  * so we don't unref the event here.  */
624 static struct ast_calendar_event *destroy_event(struct ast_calendar_event *event)
625 {
626         if (event->notify_sched > -1 && ast_sched_del(sched, event->notify_sched)) {
627                 ast_debug(3, "Notification running, can't delete sched entry\n");
628         }
629         if (event->bs_start_sched > -1 && ast_sched_del(sched, event->bs_start_sched)) {
630                 ast_debug(3, "Devicestate update (start) running, can't delete sched entry\n");
631         }
632         if (event->bs_end_sched > -1 && ast_sched_del(sched, event->bs_end_sched)) {
633                 ast_debug(3, "Devicestate update (end) running, can't delete sched entry\n");
634         }
635
636         /* If an event is being deleted and we've fired an event changing the status at the beginning,
637          * but haven't hit the end event yet, go ahead and set the devicestate to the current busy status */
638         if (event->bs_start_sched < 0 && event->bs_end_sched >= 0) {
639                 if (!calendar_is_busy(event->owner)) {
640                         ast_devstate_changed(AST_DEVICE_NOT_INUSE, AST_DEVSTATE_CACHABLE, "Calendar:%s", event->owner->name);
641                 } else {
642                         ast_devstate_changed(AST_DEVICE_BUSY, AST_DEVSTATE_CACHABLE, "Calendar:%s", event->owner->name);
643                 }
644         }
645
646         return NULL;
647 }
648
649 static int clear_events_cb(void *user_data, void *arg, int flags)
650 {
651         struct ast_calendar_event *event = user_data;
652
653         event = destroy_event(event);
654
655         return CMP_MATCH;
656 }
657
658 void ast_calendar_clear_events(struct ast_calendar *cal)
659 {
660         ast_debug(3, "Clearing all events for calendar %s\n", cal->name);
661
662         ao2_callback(cal->events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, clear_events_cb, NULL);
663 }
664
665 struct ast_calendar_event *ast_calendar_event_alloc(struct ast_calendar *cal)
666 {
667         struct ast_calendar_event *event;
668         if (!(event = ao2_alloc(sizeof(*event), calendar_event_destructor))) {
669                 return NULL;
670         }
671
672         if (ast_string_field_init(event, 32)) {
673                 event = ast_calendar_unref_event(event);
674                 return NULL;
675         }
676
677         event->owner = cal;
678         event->notify_sched = -1;
679         event->bs_start_sched = -1;
680         event->bs_end_sched = -1;
681
682         AST_LIST_HEAD_INIT_NOLOCK(&event->attendees);
683
684         return event;
685 }
686
687 struct ao2_container *ast_calendar_event_container_alloc(void)
688 {
689         return ao2_container_alloc(CALENDAR_BUCKETS, event_hash_fn, event_cmp_fn);
690 }
691
692 static void event_notification_destroy(void *data)
693 {
694         struct ast_calendar_event *event = data;
695
696         event = ast_calendar_unref_event(event);
697
698 }
699
700 static void *event_notification_duplicate(void *data)
701 {
702         struct ast_calendar_event *event = data;
703
704         if (!event) {
705                 return NULL;
706         }
707
708         ao2_ref(event, +1);
709
710         return event;
711 }
712
713 /*! \brief Generate 32 byte random string (stolen from chan_sip.c)*/
714 static char *generate_random_string(char *buf, size_t size)
715 {
716         unsigned long val[4];
717         int x;
718
719         for (x = 0; x < 4; x++) {
720                 val[x] = ast_random();
721         }
722         snprintf(buf, size, "%08lx%08lx%08lx%08lx", val[0], val[1], val[2], val[3]);
723
724         return buf;
725 }
726
727 static int null_chan_write(struct ast_channel *chan, struct ast_frame *frame)
728 {
729         return 0;
730 }
731
732 static const struct ast_channel_tech null_tech = {
733         .type = "NULL",
734         .description = "Null channel (should not see this)",
735                 .write = null_chan_write,
736 };
737
738 static void *do_notify(void *data)
739 {
740         struct ast_calendar_event *event = data;
741         struct ast_dial *dial = NULL;
742         struct ast_str *apptext = NULL, *tmpstr = NULL;
743         struct ast_datastore *datastore;
744         enum ast_dial_result res;
745         struct ast_channel *chan = NULL;
746         struct ast_variable *itervar;
747         char *tech, *dest;
748         char buf[33];
749         struct ast_format_cap *caps;
750
751         tech = ast_strdupa(event->owner->notify_channel);
752
753         if ((dest = strchr(tech, '/'))) {
754                 *dest = '\0';
755                 dest++;
756         } else {
757                 ast_log(LOG_WARNING, "Channel should be in form Tech/Dest (was '%s')\n", tech);
758                 goto notify_cleanup;
759         }
760
761         if (!(dial = ast_dial_create())) {
762                 ast_log(LOG_ERROR, "Could not create dial structure\n");
763                 goto notify_cleanup;
764         }
765
766         if (ast_dial_append(dial, tech, dest, NULL) < 0) {
767                 ast_log(LOG_ERROR, "Could not append channel\n");
768                 goto notify_cleanup;
769         }
770
771         ast_dial_set_global_timeout(dial, event->owner->notify_waittime);
772         generate_random_string(buf, sizeof(buf));
773
774         if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, 0, 0, 0, 0, 0, NULL, NULL, 0, "Calendar/%s-%s", event->owner->name, buf))) {
775                 ast_log(LOG_ERROR, "Could not allocate notification channel\n");
776                 goto notify_cleanup;
777         }
778
779         ast_channel_tech_set(chan, &null_tech);
780         ast_channel_set_writeformat(chan, ast_format_slin);
781         ast_channel_set_readformat(chan, ast_format_slin);
782         ast_channel_set_rawwriteformat(chan, ast_format_slin);
783         ast_channel_set_rawreadformat(chan, ast_format_slin);
784
785         caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
786         if (!caps) {
787                 ast_log(LOG_ERROR, "Could not allocate capabilities, notification not being sent!\n");
788                 goto notify_cleanup;
789         }
790         ast_format_cap_append(caps, ast_format_slin, 0);
791         ast_channel_nativeformats_set(chan, caps);
792         ao2_ref(caps, -1);
793
794         ast_channel_unlock(chan);
795
796         if (!(datastore = ast_datastore_alloc(&event_notification_datastore, NULL))) {
797                 ast_log(LOG_ERROR, "Could not allocate datastore, notification not being sent!\n");
798                 goto notify_cleanup;
799         }
800
801         datastore->data = event;
802         datastore->inheritance = DATASTORE_INHERIT_FOREVER;
803
804         ao2_ref(event, +1);
805
806         ast_channel_lock(chan);
807         res = ast_channel_datastore_add(chan, datastore);
808         ast_channel_unlock(chan);
809
810         if (!(tmpstr = ast_str_create(32))) {
811                 goto notify_cleanup;
812         }
813
814         for (itervar = event->owner->vars; itervar; itervar = itervar->next) {
815                 ast_str_substitute_variables(&tmpstr, 0, chan, itervar->value);
816                 pbx_builtin_setvar_helper(chan, itervar->name, ast_str_buffer(tmpstr));
817         }
818
819         if (!(apptext = ast_str_create(32))) {
820                 goto notify_cleanup;
821         }
822
823         if (!ast_strlen_zero(event->owner->notify_app)) {
824                 ast_str_set(&apptext, 0, "%s,%s", event->owner->notify_app, event->owner->notify_appdata);
825                 ast_dial_option_global_enable(dial, AST_DIAL_OPTION_ANSWER_EXEC, ast_str_buffer(apptext));
826         } else {
827         }
828
829         ast_verb(3, "Dialing %s for notification on calendar %s\n", event->owner->notify_channel, event->owner->name);
830         res = ast_dial_run(dial, chan, 0);
831
832         if (res != AST_DIAL_RESULT_ANSWERED) {
833                 ast_verb(3, "Notification call for %s was not completed\n", event->owner->name);
834         } else {
835                 struct ast_channel *answered;
836
837                 answered = ast_dial_answered_steal(dial);
838                 if (ast_strlen_zero(event->owner->notify_app)) {
839                         ast_channel_context_set(answered, event->owner->notify_context);
840                         ast_channel_exten_set(answered, event->owner->notify_extension);
841                         ast_channel_priority_set(answered, 1);
842                         ast_pbx_run(answered);
843                 }
844         }
845
846 notify_cleanup:
847         if (apptext) {
848                 ast_free(apptext);
849         }
850         if (tmpstr) {
851                 ast_free(tmpstr);
852         }
853         if (dial) {
854                 ast_dial_destroy(dial);
855         }
856         if (chan) {
857                 ast_channel_release(chan);
858         }
859
860         event = ast_calendar_unref_event(event);
861
862         return NULL;
863 }
864
865 static int calendar_event_notify(const void *data)
866 {
867         struct ast_calendar_event *event = (void *)data;
868         int res = -1;
869         pthread_t notify_thread = AST_PTHREADT_NULL;
870
871         if (!(event && event->owner)) {
872                 ast_log(LOG_ERROR, "Extremely low-cal...in fact cal is NULL!\n");
873                 return res;
874         }
875
876         ao2_ref(event, +1);
877         event->notify_sched = -1;
878
879         if (ast_pthread_create_background(&notify_thread, NULL, do_notify, event) < 0) {
880                 ast_log(LOG_ERROR, "Could not create notification thread\n");
881                 return res;
882         }
883
884         res = 0;
885
886         return res;
887 }
888
889 static int calendar_devstate_change(const void *data)
890 {
891         struct ast_calendar_event *event = (struct ast_calendar_event *)data;
892         struct timeval now = ast_tvnow();
893         int is_end_event;
894
895         if (!event) {
896                 ast_log(LOG_WARNING, "Event was NULL!\n");
897                 return 0;
898         }
899
900         ao2_ref(event, +1);
901
902         is_end_event = event->end <= now.tv_sec;
903
904         if (is_end_event) {
905                 event->bs_end_sched = -1;
906         } else {
907                 event->bs_start_sched = -1;
908         }
909
910         /* We can have overlapping events, so ignore the event->busy_state and check busy state
911          * based on all events in the calendar */
912         if (!calendar_is_busy(event->owner)) {
913                 ast_devstate_changed(AST_DEVICE_NOT_INUSE, AST_DEVSTATE_CACHABLE, "Calendar:%s", event->owner->name);
914         } else {
915                 ast_devstate_changed(AST_DEVICE_BUSY, AST_DEVSTATE_CACHABLE, "Calendar:%s", event->owner->name);
916         }
917
918         event = ast_calendar_unref_event(event);
919
920         return 0;
921 }
922
923 static void copy_event_data(struct ast_calendar_event *dst, struct ast_calendar_event *src)
924 {
925         struct ast_calendar_attendee *attendee;
926
927         ast_string_field_set(dst, summary, src->summary);
928         ast_string_field_set(dst, description, src->description);
929         ast_string_field_set(dst, organizer, src->organizer);
930         ast_string_field_set(dst, location, src->location);
931         ast_string_field_set(dst, uid, src->uid);
932         ast_string_field_set(dst, categories, src->categories);
933         dst->priority = src->priority;
934         dst->owner = src->owner;
935         dst->start = src->start;
936         dst->end = src->end;
937         dst->alarm = src->alarm;
938         dst->busy_state = src->busy_state;
939
940         /* Delete any existing attendees */
941         while ((attendee = AST_LIST_REMOVE_HEAD(&dst->attendees, next))) {
942                 ast_free(attendee);
943         }
944
945         /* Copy over the new attendees */
946         while ((attendee = AST_LIST_REMOVE_HEAD(&src->attendees, next))) {
947                 AST_LIST_INSERT_TAIL(&dst->attendees, attendee, next);
948         }
949 }
950
951 static int schedule_calendar_event(struct ast_calendar *cal, struct ast_calendar_event *old_event, struct ast_calendar_event *cmp_event)
952 {
953         struct timeval now = ast_tvnow();
954         struct ast_calendar_event *event;
955         time_t alarm_notify_sched = 0, devstate_sched_start, devstate_sched_end;
956         int changed = 0;
957
958         event = cmp_event ? cmp_event : old_event;
959
960         ao2_lock(event);
961         if (!ast_strlen_zero(cal->notify_channel) && (!cmp_event || old_event->alarm != event->alarm)) {
962                 changed = 1;
963                 if (cal->autoreminder) {
964                         alarm_notify_sched = (event->start - (60 * cal->autoreminder) - now.tv_sec) * 1000;
965                 } else if (event->alarm) {
966                         alarm_notify_sched = (event->alarm - now.tv_sec) * 1000;
967                 }
968
969                 /* For now, send the notification if we missed it, but the meeting hasn't happened yet */
970                 if (event->start >= now.tv_sec) {
971                         if (alarm_notify_sched <= 0) {
972                                 alarm_notify_sched = 1;
973                         }
974                         ast_mutex_lock(&refreshlock);
975                         AST_SCHED_REPLACE(old_event->notify_sched, sched, alarm_notify_sched, calendar_event_notify, old_event);
976                         ast_mutex_unlock(&refreshlock);
977                         ast_debug(3, "Calendar alarm event notification scheduled to happen in %ld ms\n", (long) alarm_notify_sched);
978                 }
979         }
980
981         if (!cmp_event || old_event->start != event->start) {
982                 changed = 1;
983                 devstate_sched_start = (event->start - now.tv_sec) * 1000;
984
985                 if (devstate_sched_start < 1) {
986                         devstate_sched_start = 1;
987                 }
988
989                 ast_mutex_lock(&refreshlock);
990                 AST_SCHED_REPLACE(old_event->bs_start_sched, sched, devstate_sched_start, calendar_devstate_change, old_event);
991                 ast_mutex_unlock(&refreshlock);
992                 ast_debug(3, "Calendar bs_start event notification scheduled to happen in %ld ms\n", (long) devstate_sched_start);
993         }
994
995         if (!cmp_event || old_event->end != event->end) {
996                 changed = 1;
997                 devstate_sched_end = (event->end - now.tv_sec) * 1000;
998                 ast_mutex_lock(&refreshlock);
999                 AST_SCHED_REPLACE(old_event->bs_end_sched, sched, devstate_sched_end, calendar_devstate_change, old_event);
1000                 ast_mutex_unlock(&refreshlock);
1001                 ast_debug(3, "Calendar bs_end event notification scheduled to happen in %ld ms\n", (long) devstate_sched_end);
1002         }
1003
1004         if (changed) {
1005                 ast_cond_signal(&refresh_condition);
1006         }
1007
1008         ao2_unlock(event);
1009
1010         return 0;
1011 }
1012
1013 static int merge_events_cb(void *obj, void *arg, int flags)
1014 {
1015         struct ast_calendar_event *old_event = obj, *new_event;
1016         struct ao2_container *new_events = arg;
1017
1018         /* If we don't find the old_event in new_events, then we can safely delete the old_event */
1019         if (!(new_event = find_event(new_events, old_event->uid))) {
1020                 old_event = destroy_event(old_event);
1021                 return CMP_MATCH;
1022         }
1023
1024         /* We have events to merge.  If any data that will affect a scheduler event has changed,
1025          * then we need to replace the scheduler event */
1026         schedule_calendar_event(old_event->owner, old_event, new_event);
1027
1028         /* Since we don't want to mess with cancelling sched events and adding new ones, just
1029          * copy the internals of the new_event to the old_event */
1030         copy_event_data(old_event, new_event);
1031
1032         /* Now we can go ahead and unlink the new_event from new_events and unref it so that only completely
1033          * new events remain in the container */
1034         ao2_unlink(new_events, new_event);
1035         new_event = ast_calendar_unref_event(new_event);
1036
1037         return 0;
1038 }
1039
1040 static int add_new_event_cb(void *obj, void *arg, int flags)
1041 {
1042         struct ast_calendar_event *new_event = obj;
1043         struct ao2_container *events = arg;
1044
1045         ao2_link(events, new_event);
1046         schedule_calendar_event(new_event->owner, new_event, NULL);
1047         return CMP_MATCH;
1048 }
1049
1050 void ast_calendar_merge_events(struct ast_calendar *cal, struct ao2_container *new_events)
1051 {
1052         /* Loop through all events attached to the calendar.  If there is a matching new event
1053          * merge its data over and handle any schedule changes that need to be made.  Then remove
1054          * the new_event from new_events so that we are left with only new_events that we can add later. */
1055         ao2_callback(cal->events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, merge_events_cb, new_events);
1056
1057         /* Now, we should only have completely new events in new_events.  Loop through and add them */
1058         ao2_callback(new_events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, add_new_event_cb, cal->events);
1059 }
1060
1061
1062 static int load_config(int reload)
1063 {
1064         struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
1065         struct ast_config *tmpcfg;
1066
1067         if (!(tmpcfg = ast_config_load2("calendar.conf", "calendar", config_flags)) ||
1068                 tmpcfg == CONFIG_STATUS_FILEINVALID) {
1069                 ast_log(LOG_ERROR, "Unable to load config calendar.conf\n");
1070                 return -1;
1071         }
1072
1073         if (tmpcfg == CONFIG_STATUS_FILEUNCHANGED) {
1074                 return 0;
1075         }
1076
1077         ast_rwlock_wrlock(&config_lock);
1078         if (calendar_config) {
1079                 ast_config_destroy(calendar_config);
1080         }
1081
1082         calendar_config = tmpcfg;
1083         ast_rwlock_unlock(&config_lock);
1084
1085         return 0;
1086 }
1087
1088 /*! \brief A dialplan function that can be used to determine the busy status of a calendar */
1089 static int calendar_busy_exec(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
1090 {
1091         struct ast_calendar *cal;
1092
1093         if (ast_strlen_zero(data)) {
1094                 ast_log(LOG_WARNING, "CALENDAR_BUSY requires an argument: CALENDAR_BUSY(<calendar_name>)\n");
1095                 return -1;
1096         }
1097
1098         cal = find_calendar(data);
1099
1100         if (!cal) {
1101                 ast_log(LOG_WARNING, "Could not find calendar '%s'\n", data);
1102                 return -1;
1103         }
1104
1105         strcpy(buf, calendar_is_busy(cal) ? "1" : "0");
1106         cal = unref_calendar(cal);
1107
1108         return 0;
1109 }
1110
1111 static struct ast_custom_function calendar_busy_function = {
1112     .name = "CALENDAR_BUSY",
1113     .read = calendar_busy_exec,
1114 };
1115
1116 static int add_event_to_list(struct eventlist *events, struct ast_calendar_event *event, time_t start, time_t end)
1117 {
1118         struct evententry *entry, *iter;
1119         long event_startdiff = labs(start - event->start);
1120         long event_enddiff = labs(end - event->end);
1121         int i = 0;
1122
1123         if (!(entry = ast_calloc(1, sizeof(*entry)))) {
1124                 ast_log(LOG_ERROR, "Unable to allocate memory for event list\n");
1125                 return -1;
1126         }
1127
1128         entry->event = event;
1129         ao2_ref(event, +1);
1130
1131         if (start == end) {
1132                 AST_LIST_TRAVERSE_SAFE_BEGIN(events, iter, list) {
1133                         long startdiff = labs(iter->event->start - start);
1134
1135                         ast_debug(10, "Comparing %s with startdiff %ld to %s with startdiff %ld\n", event->summary, event_startdiff, iter->event->summary, startdiff);
1136                         ++i;
1137                         if (startdiff > event_startdiff) {
1138                                 AST_LIST_INSERT_BEFORE_CURRENT(entry, list);
1139                                 return i;
1140                         }
1141                         if (startdiff == event_startdiff) {
1142                                 long enddiff = labs(iter->event->end - end);
1143
1144                                 if (enddiff > event_enddiff) {
1145                                         AST_LIST_INSERT_BEFORE_CURRENT(entry, list);
1146                                         return i;
1147                                 }
1148                                 if (event_startdiff == enddiff) {
1149                                         if (strcmp(event->uid, iter->event->uid) < 0) {
1150                                                 AST_LIST_INSERT_BEFORE_CURRENT(entry, list);
1151                                                 return i;
1152                                         }
1153                                 }
1154                         }
1155                 }
1156                 AST_LIST_TRAVERSE_SAFE_END;
1157
1158                 AST_LIST_INSERT_TAIL(events, entry, list);
1159
1160                 return i;
1161         }
1162
1163         AST_LIST_TRAVERSE_SAFE_BEGIN(events, iter, list) {
1164                 ++i;
1165                 if (iter->event->start > event->start) {
1166                         AST_LIST_INSERT_BEFORE_CURRENT(entry, list);
1167                         return i;
1168                 }
1169
1170                 if (iter->event->start == event->start) {
1171                         if ((iter->event->end - iter->event->start) == (event->end - event->start)) {
1172                                 if (strcmp(event->uid, iter->event->uid) < 0) {
1173                                         AST_LIST_INSERT_BEFORE_CURRENT(entry, list);
1174                                         return i;
1175                                 }
1176                         }
1177                         if ((iter->event->end - iter->event->start) < (event->end - event->start)) {
1178                                 AST_LIST_INSERT_BEFORE_CURRENT(entry, list);
1179                                 return i;
1180                         }
1181                 }
1182         }
1183         AST_LIST_TRAVERSE_SAFE_END;
1184
1185         AST_LIST_INSERT_TAIL(events, entry, list);
1186
1187         return i;
1188 }
1189
1190 static void eventlist_destroy(void *data)
1191 {
1192         struct eventlist *events = data;
1193
1194         ao2_ref(events, -1);
1195 }
1196
1197 static void *eventlist_duplicate(void *data)
1198 {
1199         struct eventlist *events = data;
1200
1201         if (!events) {
1202                 return NULL;
1203         }
1204
1205         ao2_ref(events, +1);
1206
1207         return events;
1208 }
1209
1210 static int calendar_query_exec(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
1211 {
1212         struct ast_calendar *cal;
1213         struct ao2_iterator i;
1214         struct ast_calendar_event *event;
1215         struct eventlist *events;
1216         time_t start = INT_MIN, end = INT_MAX;
1217         struct ast_datastore *eventlist_datastore;
1218         AST_DECLARE_APP_ARGS(args,
1219                 AST_APP_ARG(calendar);
1220                 AST_APP_ARG(start);
1221                 AST_APP_ARG(end);
1222         );
1223
1224         if (!chan) {
1225                 ast_log(LOG_WARNING, "%s requires a channel to store the data on\n", cmd);
1226                 return -1;
1227         }
1228
1229         AST_STANDARD_APP_ARGS(args, data);
1230
1231         if (ast_strlen_zero(args.calendar)) {
1232                 ast_log(LOG_WARNING, "%s requires a calendar argument\n", cmd);
1233                 return -1;
1234         }
1235
1236         if (!(cal = find_calendar(args.calendar))) {
1237                 ast_log(LOG_WARNING, "Unknown calendar '%s'\n", args.calendar);
1238                 return -1;
1239         }
1240
1241         if (!(events = ao2_alloc(sizeof(*events), eventlist_destructor))) {
1242                 ast_log(LOG_ERROR, "Unable to allocate memory for event list\n");
1243                 cal = unref_calendar(cal);
1244                 return -1;
1245         }
1246
1247         if (!ast_strlen_zero(args.start)) {
1248                 start = atoi(args.start);
1249         }
1250
1251         if (!ast_strlen_zero(args.end)) {
1252                 end = atoi(args.end);
1253         }
1254
1255         i = ao2_iterator_init(cal->events, 0);
1256         while ((event = ao2_iterator_next(&i))) {
1257                 if (!(start > event->end || end < event->start)) {
1258                         ast_debug(10, "%s (%ld - %ld) overlapped with (%ld - %ld)\n", event->summary, (long) event->start, (long) event->end, (long) start, (long) end);
1259                         if (add_event_to_list(events, event, start, end) < 0) {
1260                                 event = ast_calendar_unref_event(event);
1261                                 cal = unref_calendar(cal);
1262                                 ao2_ref(events, -1);
1263                                 ao2_iterator_destroy(&i);
1264                                 return -1;
1265                         }
1266                 }
1267
1268                 event = ast_calendar_unref_event(event);
1269         }
1270         ao2_iterator_destroy(&i);
1271
1272         ast_channel_lock(chan);
1273         do {
1274                 generate_random_string(buf, len);
1275         } while (ast_channel_datastore_find(chan, &eventlist_datastore_info, buf));
1276         ast_channel_unlock(chan);
1277
1278         if (!(eventlist_datastore = ast_datastore_alloc(&eventlist_datastore_info, buf))) {
1279                 ast_log(LOG_ERROR, "Could not allocate datastore!\n");
1280                 cal = unref_calendar(cal);
1281                 ao2_ref(events, -1);
1282                 return -1;
1283         }
1284
1285         eventlist_datastore->inheritance = DATASTORE_INHERIT_FOREVER;
1286         eventlist_datastore->data = events;
1287
1288         ast_channel_lock(chan);
1289         ast_channel_datastore_add(chan, eventlist_datastore);
1290         ast_channel_unlock(chan);
1291
1292         cal = unref_calendar(cal);
1293         return 0;
1294 }
1295
1296 static struct ast_custom_function calendar_query_function = {
1297     .name = "CALENDAR_QUERY",
1298     .read = calendar_query_exec,
1299 };
1300
1301 static void calendar_join_attendees(struct ast_calendar_event *event, char *buf, size_t len)
1302 {
1303         struct ast_str *tmp;
1304         struct ast_calendar_attendee *attendee;
1305
1306         if (!(tmp = ast_str_create(32))) {
1307                 ast_log(LOG_ERROR, "Could not allocate memory for attendees!\n");
1308                 return;
1309         }
1310
1311         AST_LIST_TRAVERSE(&event->attendees, attendee, next) {
1312                 ast_str_append(&tmp, 0, "%s%s", attendee == AST_LIST_FIRST(&event->attendees) ? "" : ",", attendee->data);
1313         }
1314
1315         ast_copy_string(buf, ast_str_buffer(tmp), len);
1316         ast_free(tmp);
1317 }
1318
1319 static int calendar_query_result_exec(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
1320 {
1321         struct ast_datastore *datastore;
1322         struct eventlist *events;
1323         struct evententry *entry;
1324         int row = 1;
1325         size_t listlen = 0;
1326         AST_DECLARE_APP_ARGS(args,
1327                 AST_APP_ARG(id);
1328                 AST_APP_ARG(field);
1329                 AST_APP_ARG(row);
1330         );
1331
1332         if (!chan) {
1333                 ast_log(LOG_WARNING, "%s requires a channel\n", cmd);
1334                 return -1;
1335         }
1336
1337         AST_STANDARD_APP_ARGS(args, data);
1338
1339         if (ast_strlen_zero(args.id) || ast_strlen_zero(args.field)) {
1340                 ast_log(LOG_WARNING, "%s requires an id and a field", cmd);
1341                 return -1;
1342         }
1343
1344         ast_channel_lock(chan);
1345         if (!(datastore = ast_channel_datastore_find(chan, &eventlist_datastore_info, args.id))) {
1346                 ast_log(LOG_WARNING, "There is no event notification datastore with id '%s' on '%s'!\n", args.id, ast_channel_name(chan));
1347                 ast_channel_unlock(chan);
1348                 return -1;
1349         }
1350         ast_channel_unlock(chan);
1351
1352         if (!(events = datastore->data)) {
1353                 ast_log(LOG_WARNING, "The datastore contains no data!\n");
1354                 return -1;
1355         }
1356
1357         if (!ast_strlen_zero(args.row)) {
1358                 row = atoi(args.row);
1359         }
1360
1361         AST_LIST_TRAVERSE(events, entry, list) {
1362                 listlen++;
1363         }
1364
1365         if (!strcasecmp(args.field, "getnum")) {
1366                 snprintf(buf, len, "%zu", listlen);
1367                 return 0;
1368         }
1369
1370         AST_LIST_TRAVERSE(events, entry, list) {
1371                 if (--row) {
1372                         continue;
1373                 }
1374                 if (!strcasecmp(args.field, "summary")) {
1375                         ast_copy_string(buf, entry->event->summary, len);
1376                 } else if (!strcasecmp(args.field, "description")) {
1377                         ast_copy_string(buf, entry->event->description, len);
1378                 } else if (!strcasecmp(args.field, "organizer")) {
1379                         ast_copy_string(buf, entry->event->organizer, len);
1380                 } else if (!strcasecmp(args.field, "location")) {
1381                         ast_copy_string(buf, entry->event->location, len);
1382                 } else if (!strcasecmp(args.field, "categories")) {
1383                         ast_copy_string(buf, entry->event->categories, len);
1384                 } else if (!strcasecmp(args.field, "priority")) {
1385                         snprintf(buf, len, "%d", entry->event->priority);
1386                 } else if (!strcasecmp(args.field, "calendar")) {
1387                         ast_copy_string(buf, entry->event->owner->name, len);
1388                 } else if (!strcasecmp(args.field, "uid")) {
1389                         ast_copy_string(buf, entry->event->uid, len);
1390                 } else if (!strcasecmp(args.field, "start")) {
1391                         snprintf(buf, len, "%ld", (long) entry->event->start);
1392                 } else if (!strcasecmp(args.field, "end")) {
1393                         snprintf(buf, len, "%ld", (long) entry->event->end);
1394                 } else if (!strcasecmp(args.field, "busystate")) {
1395                         snprintf(buf, len, "%u", entry->event->busy_state);
1396                 } else if (!strcasecmp(args.field, "attendees")) {
1397                         calendar_join_attendees(entry->event, buf, len);
1398                 } else {
1399                         ast_log(LOG_WARNING, "Unknown field '%s'\n", args.field);
1400                 }
1401                 break;
1402         }
1403
1404         return 0;
1405 }
1406
1407 static struct ast_custom_function calendar_query_result_function = {
1408         .name = "CALENDAR_QUERY_RESULT",
1409         .read = calendar_query_result_exec,
1410 };
1411
1412 static int calendar_write_exec(struct ast_channel *chan, const char *cmd, char *data, const char *value)
1413 {
1414         int i, j, ret = -1;
1415         char *val_dup = NULL;
1416         struct ast_calendar *cal = NULL;
1417         struct ast_calendar_event *event = NULL;
1418         struct timeval tv = ast_tvnow();
1419         AST_DECLARE_APP_ARGS(fields,
1420                 AST_APP_ARG(field)[10];
1421         );
1422         AST_DECLARE_APP_ARGS(values,
1423                 AST_APP_ARG(value)[10];
1424         );
1425
1426         if (!(val_dup = ast_strdup(value))) {
1427                 ast_log(LOG_ERROR, "Could not allocate memory for values\n");
1428                 goto write_cleanup;
1429         }
1430
1431         AST_STANDARD_APP_ARGS(fields, data);
1432         AST_STANDARD_APP_ARGS(values, val_dup);
1433
1434         /* XXX Eventually we will support unnamed calendars, so if we don't find one, we parse
1435          * for a calendar type and create it */
1436         if (!(cal = find_calendar(fields.field[0]))) {
1437                 ast_log(LOG_WARNING, "Couldn't find calendar '%s'\n", fields.field[0]);
1438                 goto write_cleanup;
1439         }
1440
1441         if (!(cal->tech->write_event)) {
1442                 ast_log(LOG_WARNING, "Calendar '%s' has no write function!\n", cal->name);
1443                 goto write_cleanup;
1444         }
1445
1446         if (!(event = ast_calendar_event_alloc(cal))) {
1447                 goto write_cleanup;
1448         }
1449
1450         if (ast_strlen_zero(fields.field[0])) {
1451                 ast_log(LOG_WARNING, "CALENDAR_WRITE requires a calendar name!\n");
1452                 goto write_cleanup;
1453         }
1454
1455         if (fields.argc - 1 != values.argc) {
1456                 ast_log(LOG_WARNING, "CALENDAR_WRITE should have the same number of fields (%u) and values (%u)!\n", fields.argc - 1, values.argc);
1457                 goto write_cleanup;
1458         }
1459
1460         event->owner = cal;
1461
1462         for (i = 1, j = 0; i < fields.argc; i++, j++) {
1463                 if (!strcasecmp(fields.field[i], "summary")) {
1464                         ast_string_field_set(event, summary, values.value[j]);
1465                 } else if (!strcasecmp(fields.field[i], "description")) {
1466                         ast_string_field_set(event, description, values.value[j]);
1467                 } else if (!strcasecmp(fields.field[i], "organizer")) {
1468                         ast_string_field_set(event, organizer, values.value[j]);
1469                 } else if (!strcasecmp(fields.field[i], "location")) {
1470                         ast_string_field_set(event, location, values.value[j]);
1471                 } else if (!strcasecmp(fields.field[i], "categories")) {
1472                         ast_string_field_set(event, categories, values.value[j]);
1473                 } else if (!strcasecmp(fields.field[i], "priority")) {
1474                         event->priority = atoi(values.value[j]);
1475                 } else if (!strcasecmp(fields.field[i], "uid")) {
1476                         ast_string_field_set(event, uid, values.value[j]);
1477                 } else if (!strcasecmp(fields.field[i], "start")) {
1478                         event->start = atoi(values.value[j]);
1479                 } else if (!strcasecmp(fields.field[i], "end")) {
1480                         event->end = atoi(values.value[j]);
1481                 } else if (!strcasecmp(fields.field[i], "busystate")) {
1482                         event->busy_state = atoi(values.value[j]);
1483                 } else {
1484                         ast_log(LOG_WARNING, "Unknown calendar event field '%s'\n", fields.field[i]);
1485                 }
1486         }
1487
1488         if (!event->start) {
1489                 event->start = tv.tv_sec;
1490         }
1491
1492         if (!event->end) {
1493                 event->end = tv.tv_sec;
1494         }
1495
1496         if((ret = cal->tech->write_event(event))) {
1497                 ast_log(LOG_WARNING, "Writing event to calendar '%s' failed!\n", cal->name);
1498         }
1499
1500 write_cleanup:
1501         if (ret) {
1502                 pbx_builtin_setvar_helper(chan, "CALENDAR_SUCCESS", "0");
1503         } else {
1504                 pbx_builtin_setvar_helper(chan, "CALENDAR_SUCCESS", "1");
1505         }
1506         if (cal) {
1507                 cal = unref_calendar(cal);
1508         }
1509         if (event) {
1510                 event = ast_calendar_unref_event(event);
1511         }
1512         if (val_dup) {
1513                 ast_free(val_dup);
1514         }
1515
1516         return ret;
1517 }
1518
1519 static struct ast_custom_function calendar_write_function = {
1520         .name = "CALENDAR_WRITE",
1521         .write = calendar_write_exec,
1522 };
1523
1524 /*! \brief CLI command to list available calendars */
1525 static char *handle_show_calendars(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1526 {
1527 #define FORMAT "%-20.20s %-10.10s %-6.6s\n"
1528         struct ao2_iterator i;
1529         struct ast_calendar *cal;
1530
1531         switch(cmd) {
1532         case CLI_INIT:
1533                 e->command = "calendar show calendars";
1534                 e->usage =
1535                         "Usage: calendar show calendars\n"
1536                         "       Lists all registered calendars.\n";
1537                 return NULL;
1538         case CLI_GENERATE:
1539                 return NULL;
1540         }
1541
1542         ast_cli(a->fd, FORMAT, "Calendar", "Type", "Status");
1543         ast_cli(a->fd, FORMAT, "--------", "----", "------");
1544         i = ao2_iterator_init(calendars, 0);
1545         while ((cal = ao2_iterator_next(&i))) {
1546                 ast_cli(a->fd, FORMAT, cal->name, cal->tech->type, calendar_is_busy(cal) ? "busy" : "free");
1547                 cal = unref_calendar(cal);
1548         }
1549         ao2_iterator_destroy(&i);
1550
1551         return CLI_SUCCESS;
1552 #undef FORMAT
1553 }
1554
1555 /*! \brief CLI command to list of all calendars types currently loaded on the backend */
1556 static char *handle_show_calendars_types(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1557 {
1558 #define FORMAT "%-10.10s %-30.30s\n"
1559         struct ast_calendar_tech *iter;
1560
1561
1562         switch(cmd) {
1563         case CLI_INIT:
1564                 e->command = "calendar show types";
1565                 e->usage =
1566                         "Usage: calendar show types\n"
1567                         "       Lists all registered calendars types.\n";
1568                 return NULL;
1569         case CLI_GENERATE:
1570                 return NULL;
1571         }
1572
1573         ast_cli(a->fd, FORMAT, "Type", "Description");
1574         AST_LIST_LOCK(&techs);
1575         AST_LIST_TRAVERSE(&techs, iter, list) {
1576                 ast_cli(a->fd, FORMAT, iter->type, iter->description);
1577         }
1578         AST_LIST_UNLOCK(&techs);
1579
1580         return CLI_SUCCESS;
1581 #undef FORMAT
1582 }
1583
1584 static char *epoch_to_string(char *buf, size_t buflen, time_t epoch)
1585 {
1586         struct ast_tm tm;
1587         struct timeval tv = {
1588                 .tv_sec = epoch,
1589         };
1590
1591         if (!epoch) {
1592                 *buf = '\0';
1593                 return buf;
1594         }
1595         ast_localtime(&tv, &tm, NULL);
1596         ast_strftime(buf, buflen, "%F %r %z", &tm);
1597
1598         return buf;
1599 }
1600
1601 static char *handle_show_calendar(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1602 {
1603 #define FORMAT  "%-18.18s : %-20.20s\n"
1604 #define FORMAT2 "%-12.12s: %-40.60s\n"
1605         struct ao2_iterator i;
1606         struct ast_calendar *cal;
1607         struct ast_calendar_event *event;
1608         int which = 0;
1609         char *ret = NULL;
1610
1611         switch(cmd) {
1612         case CLI_INIT:
1613                 e->command = "calendar show calendar";
1614                 e->usage =
1615                         "Usage: calendar show calendar <calendar name>\n"
1616                         "       Displays information about a calendar\n";
1617                 return NULL;
1618
1619         case CLI_GENERATE:
1620                 if (a->pos != 3) {
1621                         return NULL;
1622                 }
1623                 i = ao2_iterator_init(calendars, 0);
1624                 while ((cal = ao2_iterator_next(&i))) {
1625                         if (!strncasecmp(a->word, cal->name, strlen(a->word)) && ++which > a->n) {
1626                                 ret = ast_strdup(cal->name);
1627                                 cal = unref_calendar(cal);
1628                                 break;
1629                         }
1630                         cal = unref_calendar(cal);
1631                 }
1632                 ao2_iterator_destroy(&i);
1633                 return ret;
1634         }
1635
1636         if (a->argc != 4) {
1637                 return CLI_SHOWUSAGE;
1638         }
1639
1640         if (!(cal = find_calendar(a->argv[3]))) {
1641                 return NULL;
1642         }
1643
1644         ast_cli(a->fd, FORMAT, "Name", cal->name);
1645         ast_cli(a->fd, FORMAT, "Notify channel", cal->notify_channel);
1646         ast_cli(a->fd, FORMAT, "Notify context", cal->notify_context);
1647         ast_cli(a->fd, FORMAT, "Notify extension", cal->notify_extension);
1648         ast_cli(a->fd, FORMAT, "Notify application", cal->notify_app);
1649         ast_cli(a->fd, FORMAT, "Notify appdata", cal->notify_appdata);
1650         ast_cli(a->fd, "%-17.17s : %d\n", "Refresh time", cal->refresh);
1651         ast_cli(a->fd, "%-17.17s : %d\n", "Timeframe", cal->timeframe);
1652
1653         if (cal->autoreminder) {
1654                 ast_cli(a->fd, "%-17.17s : %d minutes before event\n", "Autoreminder", cal->autoreminder);
1655         } else {
1656                 ast_cli(a->fd, "%-17.17s : None\n", "Autoreminder");
1657         }
1658
1659         ast_cli(a->fd, "%s\n", "Events");
1660         ast_cli(a->fd, "%s\n", "------");
1661
1662         i = ao2_iterator_init(cal->events, 0);
1663         while ((event = ao2_iterator_next(&i))) {
1664                 char buf[100];
1665
1666                 ast_cli(a->fd, FORMAT2, "Summary", event->summary);
1667                 ast_cli(a->fd, FORMAT2, "Description", event->description);
1668                 ast_cli(a->fd, FORMAT2, "Organizer", event->organizer);
1669                 ast_cli(a->fd, FORMAT2, "Location", event->location);
1670                 ast_cli(a->fd, FORMAT2, "Categories", event->categories);
1671                 ast_cli(a->fd, "%-12.12s: %d\n", "Priority", event->priority);
1672                 ast_cli(a->fd, FORMAT2, "UID", event->uid);
1673                 ast_cli(a->fd, FORMAT2, "Start", epoch_to_string(buf, sizeof(buf), event->start));
1674                 ast_cli(a->fd, FORMAT2, "End", epoch_to_string(buf, sizeof(buf), event->end));
1675                 ast_cli(a->fd, FORMAT2, "Alarm", epoch_to_string(buf, sizeof(buf), event->alarm));
1676                 ast_cli(a->fd, "\n");
1677
1678                 event = ast_calendar_unref_event(event);
1679         }
1680         ao2_iterator_destroy(&i);
1681         cal = unref_calendar(cal);
1682         return CLI_SUCCESS;
1683 #undef FORMAT
1684 #undef FORMAT2
1685 }
1686
1687 static char *handle_dump_sched(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1688 {
1689         switch(cmd) {
1690         case CLI_INIT:
1691                 e->command = "calendar dump sched";
1692                 e->usage =
1693                         "Usage: calendar dump sched\n"
1694                         "       Dump the calendar sched context";
1695                 return NULL;
1696
1697         case CLI_GENERATE:
1698                 return NULL;
1699         }
1700
1701         ast_sched_dump(sched);
1702
1703         return CLI_SUCCESS;
1704 }
1705
1706 static struct ast_cli_entry calendar_cli[] = {
1707         AST_CLI_DEFINE(handle_show_calendar, "Display information about a calendar"),
1708         AST_CLI_DEFINE(handle_show_calendars, "Show registered calendars"),
1709         AST_CLI_DEFINE(handle_dump_sched, "Dump calendar sched context"),
1710         AST_CLI_DEFINE(handle_show_calendars_types, "Show all calendar types loaded"),
1711 };
1712
1713 static int calendar_event_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
1714 {
1715         struct ast_datastore *datastore;
1716         struct ast_calendar_event *event;
1717
1718         if (!chan) {
1719                 ast_log(LOG_WARNING, "No channel was provided to %s function.\n", cmd);
1720                 return -1;
1721         }
1722
1723         if (ast_strlen_zero(data)) {
1724                 ast_log(LOG_WARNING, "%s requires an argument\n", cmd);
1725                 return -1;
1726         }
1727
1728         ast_channel_lock(chan);
1729         if (!(datastore = ast_channel_datastore_find(chan, &event_notification_datastore, NULL))) {
1730                 ast_log(LOG_WARNING, "There is no event notification datastore on '%s'!\n", ast_channel_name(chan));
1731                 ast_channel_unlock(chan);
1732                 return -1;
1733         }
1734         ast_channel_unlock(chan);
1735
1736         if (!(event = datastore->data)) {
1737                 ast_log(LOG_WARNING, "The datastore contains no data!\n");
1738                 return -1;
1739         }
1740
1741         if (!strcasecmp(data, "summary")) {
1742                 ast_copy_string(buf, event->summary, len);
1743         } else if (!strcasecmp(data, "description")) {
1744                 ast_copy_string(buf, event->description, len);
1745         } else if (!strcasecmp(data, "organizer")) {
1746                 ast_copy_string(buf, event->organizer, len);
1747         } else if (!strcasecmp(data, "location")) {
1748                 ast_copy_string(buf, event->location, len);
1749         } else if (!strcasecmp(data, "categories")) {
1750                 ast_copy_string(buf, event->categories, len);
1751         } else if (!strcasecmp(data, "priority")) {
1752                 snprintf(buf, len, "%d", event->priority);
1753         } else if (!strcasecmp(data, "calendar")) {
1754                 ast_copy_string(buf, event->owner->name, len);
1755         } else if (!strcasecmp(data, "uid")) {
1756                 ast_copy_string(buf, event->uid, len);
1757         } else if (!strcasecmp(data, "start")) {
1758                 snprintf(buf, len, "%ld", (long)event->start);
1759         } else if (!strcasecmp(data, "end")) {
1760                 snprintf(buf, len, "%ld", (long)event->end);
1761         } else if (!strcasecmp(data, "busystate")) {
1762                 snprintf(buf, len, "%u", event->busy_state);
1763         } else if (!strcasecmp(data, "attendees")) {
1764                 calendar_join_attendees(event, buf, len);
1765         }
1766
1767
1768         return 0;
1769 }
1770
1771 static struct ast_custom_function calendar_event_function = {
1772         .name = "CALENDAR_EVENT",
1773         .read = calendar_event_read,
1774 };
1775
1776 static int cb_pending_deletion(void *user_data, void *arg, int flags)
1777 {
1778         struct ast_calendar *cal = user_data;
1779
1780         cal->pending_deletion = 1;
1781
1782         return CMP_MATCH;
1783 }
1784
1785 static int cb_rm_pending_deletion(void *user_data, void *arg, int flags)
1786 {
1787         struct ast_calendar *cal = user_data;
1788
1789         return cal->pending_deletion ? CMP_MATCH : 0;
1790 }
1791
1792 static int reload(void)
1793 {
1794         struct ast_calendar_tech *iter;
1795
1796         ast_mutex_lock(&reloadlock);
1797
1798         /* Mark existing calendars for deletion */
1799         ao2_callback(calendars, OBJ_NODATA | OBJ_MULTIPLE, cb_pending_deletion, NULL);
1800         load_config(1);
1801
1802         AST_LIST_LOCK(&techs);
1803         AST_LIST_TRAVERSE(&techs, iter, list) {
1804                 if (load_tech_calendars(iter)) {
1805                         ast_log(LOG_WARNING, "Failed to reload %s calendars, module disabled\n", iter->type);
1806                 }
1807         }
1808         AST_LIST_UNLOCK(&techs);
1809
1810         /* Delete calendars that no longer show up in the config */
1811         ao2_callback(calendars, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, cb_rm_pending_deletion, NULL);
1812
1813         ast_mutex_unlock(&reloadlock);
1814
1815         return 0;
1816 }
1817
1818 static void *do_refresh(void *data)
1819 {
1820         for (;;) {
1821                 struct timeval now = ast_tvnow();
1822                 struct timespec ts = {0,};
1823                 int wait;
1824
1825                 ast_mutex_lock(&refreshlock);
1826
1827                 while (!module_unloading) {
1828                         if ((wait = ast_sched_wait(sched)) < 0) {
1829                                 wait = 1000;
1830                         }
1831
1832                         ts.tv_sec = (now.tv_sec + wait / 1000) + 1;
1833                         if (ast_cond_timedwait(&refresh_condition, &refreshlock, &ts) == ETIMEDOUT) {
1834                                 break;
1835                         }
1836                 }
1837                 ast_mutex_unlock(&refreshlock);
1838
1839                 if (module_unloading) {
1840                         break;
1841                 }
1842                 ast_sched_runq(sched);
1843         }
1844
1845         return NULL;
1846 }
1847
1848 /* If I were to allow unloading it would look something like this */
1849 static int unload_module(void)
1850 {
1851         struct ast_calendar_tech *tech;
1852
1853         ast_devstate_prov_del("calendar");
1854         ast_custom_function_unregister(&calendar_busy_function);
1855         ast_custom_function_unregister(&calendar_event_function);
1856         ast_custom_function_unregister(&calendar_query_function);
1857         ast_custom_function_unregister(&calendar_query_result_function);
1858         ast_custom_function_unregister(&calendar_write_function);
1859         ast_cli_unregister_multiple(calendar_cli, ARRAY_LEN(calendar_cli));
1860
1861         /* Remove all calendars */
1862         ao2_callback(calendars, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL);
1863         ao2_cleanup(calendars);
1864         calendars = NULL;
1865
1866         ast_mutex_lock(&refreshlock);
1867         module_unloading = 1;
1868         ast_cond_signal(&refresh_condition);
1869         ast_mutex_unlock(&refreshlock);
1870         pthread_join(refresh_thread, NULL);
1871
1872         ast_sched_context_destroy(sched);
1873
1874         AST_LIST_LOCK(&techs);
1875         AST_LIST_TRAVERSE_SAFE_BEGIN(&techs, tech, list) {
1876                 ast_unload_resource(tech->module, 0);
1877         }
1878         AST_LIST_TRAVERSE_SAFE_END;
1879         AST_LIST_UNLOCK(&techs);
1880
1881         ast_config_destroy(calendar_config);
1882         calendar_config = NULL;
1883
1884         return 0;
1885 }
1886
1887 /*!
1888  * \brief Load the module
1889  *
1890  * Module loading including tests for configuration or dependencies.
1891  * This function can return AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_DECLINE,
1892  * or AST_MODULE_LOAD_SUCCESS. If a dependency or environment variable fails
1893  * tests return AST_MODULE_LOAD_FAILURE. If the module can not load the
1894  * configuration file or other non-critical problem return
1895  * AST_MODULE_LOAD_DECLINE. On success return AST_MODULE_LOAD_SUCCESS.
1896  */
1897 static int load_module(void)
1898 {
1899         if (!(calendars = ao2_container_alloc(CALENDAR_BUCKETS, calendar_hash_fn, calendar_cmp_fn))) {
1900                 ast_log(LOG_ERROR, "Unable to allocate calendars container!\n");
1901                 return AST_MODULE_LOAD_DECLINE;
1902         }
1903
1904         if (load_config(0)) {
1905                 /* We don't have calendar support enabled */
1906                 return AST_MODULE_LOAD_DECLINE;
1907         }
1908
1909         ast_mutex_init(&refreshlock);
1910         ast_cond_init(&refresh_condition, NULL);
1911         ast_mutex_init(&reloadlock);
1912
1913         if (!(sched = ast_sched_context_create())) {
1914                 ast_log(LOG_ERROR, "Unable to create sched context\n");
1915                 ast_config_destroy(calendar_config);
1916                 calendar_config = NULL;
1917                 return AST_MODULE_LOAD_DECLINE;
1918         }
1919
1920         if (ast_pthread_create_background(&refresh_thread, NULL, do_refresh, NULL) < 0) {
1921                 ast_log(LOG_ERROR, "Unable to start refresh thread--notifications disabled!\n");
1922         }
1923
1924         ast_custom_function_register(&calendar_busy_function);
1925         ast_custom_function_register(&calendar_event_function);
1926         ast_custom_function_register(&calendar_query_function);
1927         ast_custom_function_register(&calendar_query_result_function);
1928         ast_custom_function_register(&calendar_write_function);
1929         ast_cli_register_multiple(calendar_cli, ARRAY_LEN(calendar_cli));
1930
1931         ast_devstate_prov_add("Calendar", calendarstate);
1932
1933         return AST_MODULE_LOAD_SUCCESS;
1934 }
1935 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Asterisk Calendar integration",
1936         .support_level = AST_MODULE_SUPPORT_EXTENDED,
1937         .load = load_module,
1938         .unload = unload_module,
1939         .reload = reload,
1940         .load_pri = AST_MODPRI_DEVSTATE_PROVIDER,
1941 );