2 * This file is part of DisOrder
3 * Copyright (C) 2008 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 /** @file server/schedule.c
20 * @brief Scheduled events
22 * @ref trackdb_scheduledb is a mapping from ID strings to encoded
23 * key-value pairs called 'actiondata'.
25 * Possible actiondata keys are:
26 * - @b when: when to perform this action (required)
27 * - @b who: originator for action (required)
28 * - @b action: action to perform (required)
29 * - @b track: for @c action=play, the track to play
30 * - @b key: for @c action=set-global, the global pref to set
31 * - @b value: for @c action=set-global, the value to set (omit to unset)
32 * - @b priority: the importance of this action
33 * - @b recurs: how the event recurs; NOT IMPLEMENTED
34 * - ...others to be defined
36 * Possible actions are:
37 * - @b play: play a track
38 * - @b set-global: set or unset a global pref
39 * - ...others to be defined
41 * Possible priorities are:
42 * - @b junk: junk actions that are in the past at startup are discarded
43 * - @b normal: normal actions that are in the past at startup are run
44 * immediately. (This the default.)
45 * - ...others to be defined
47 * On startup the schedule database is read and a timeout set on the event loop
48 * for each action. Similarly when an action is added, a timeout is set on the
49 * event loop. The timeout has the ID attached as user data so that the action
50 * can easily be found again.
52 * Recurring events are NOT IMPLEMENTED yet but this is the proposed
55 * Recurring events are updated with a new 'when' field when they are processed
56 * (event on error). Non-recurring events are just deleted after processing.
58 * The recurs field is a whitespace-delimited list of criteria:
59 * - nn:nn or nn:nn:nn define a time of day, in local time. There must be
60 * at least one of these but can be more than one.
61 * - a day name (monday, tuesday, ...) defines the days of the week on
62 * which the event will recur. There can be more than one.
63 * - a day number and month name (1 january, 5 february, ...) defines
64 * the days of the year on which the event will recur. There can be
65 * more than one of these.
67 * Day and month names are case insensitive. Multiple languages are
68 * likely to be supported, especially if people send me pointers to
69 * their month and day names. Abbreviations are NOT supported, as
70 * there is more of a risk of a clash between different languages that
73 * If there are no week or year days then the event recurs every day.
75 * If there are both week and year days then the union of them is
76 * taken, rather than the intersection.
78 * TODO: support recurring events.
80 * TODO: add disorder-dump support
82 #include "disorder-server.h"
84 static int schedule_trigger(ev_source *ev,
85 const struct timeval *now,
87 static int schedule_lookup(const char *id,
88 struct kvp *actiondata);
90 /** @brief List of required fields in a scheduled event */
91 static const char *const schedule_required[] = {"when", "who", "action"};
93 /** @brief Number of elements in @ref schedule_required */
94 #define NREQUIRED (int)(sizeof schedule_required / sizeof *schedule_required)
96 /** @brief Parse a scheduled event key and data
97 * @param k Pointer to key
98 * @param whenp Where to store timestamp
99 * @return 0 on success, non-0 on error
101 * Rejects entries that are invalid in various ways.
103 static int schedule_parse(const DBT *k,
106 struct kvp **actiondatap,
109 struct kvp *actiondata;
112 /* Reject bogus keys */
113 if(!k->size || k->size > 128) {
114 error(0, "bogus schedule.db key (%lu bytes)", (unsigned long)k->size);
117 id = xstrndup(k->data, k->size);
118 actiondata = kvp_urldecode(d->data, d->size);
119 /* Reject items without the required fields */
120 for(n = 0; n < NREQUIRED; ++n) {
121 if(!kvp_get(actiondata, schedule_required[n])) {
122 error(0, "scheduled event %s: missing required field '%s'",
123 id, schedule_required[n]);
127 /* Return the results */
131 *actiondatap = actiondata;
133 *whenp = (time_t)atoll(kvp_get(actiondata, "when"));
137 /** @brief Delete via a cursor
138 * @return 0 or @c DB_LOCK_DEADLOCK */
139 static int cdel(DBC *cursor) {
142 switch(err = cursor->c_del(cursor, 0)) {
145 case DB_LOCK_DEADLOCK:
146 error(0, "error deleting from schedule.db: %s", db_strerror(err));
149 fatal(0, "error deleting from schedule.db: %s", db_strerror(err));
154 /** @brief Initialize the schedule
155 * @param ev Event loop
156 * @param tid Transaction ID
158 * Sets a callback for all action times except for junk actions that are
159 * already in the past, which are discarded.
161 static int schedule_init_tid(ev_source *ev,
167 cursor = trackdb_opencursor(trackdb_scheduledb, tid);
168 while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
171 struct kvp *actiondata;
174 /* Parse the key. We destroy bogus entries on sight. */
175 if(schedule_parse(&k, &d, &id, &actiondata, &when.tv_sec)) {
176 if((err = cdel(cursor)))
181 /* The action might be in the past */
182 if(when.tv_sec < time(0)) {
183 const char *priority = kvp_get(actiondata, "priority");
185 if(priority && !strcmp(priority, "junk")) {
186 /* Junk actions that are in the past are discarded during startup */
187 /* TODO recurring events should be handled differently here */
188 info("junk event %s is in the past, discarding", id);
195 /* Arrange a callback when the scheduled event is due */
196 ev_timeout(ev, 0/*handlep*/, &when, schedule_trigger, id);
202 case DB_LOCK_DEADLOCK:
203 error(0, "error querying schedule.db: %s", db_strerror(err));
206 fatal(0, "error querying schedule.db: %s", db_strerror(err));
209 if(trackdb_closecursor(cursor))
210 err = DB_LOCK_DEADLOCK;
214 /** @brief Initialize the schedule
215 * @param ev Event loop
217 * Sets a callback for all action times except for junk actions that are
218 * already in the past, which are discarded.
220 void schedule_init(ev_source *ev) {
222 WITH_TRANSACTION(schedule_init_tid(ev, tid));
225 /******************************************************************************/
227 /** @brief Create a scheduled event
228 * @param ev Event loop
229 * @param actiondata Action data
231 static int schedule_add_tid(const char *id,
232 struct kvp *actiondata,
237 memset(&k, 0, sizeof k);
240 switch(err = trackdb_scheduledb->put(trackdb_scheduledb, tid, &k,
241 encode_data(&d, actiondata),
245 case DB_LOCK_DEADLOCK:
246 error(0, "error updating schedule.db: %s", db_strerror(err));
251 fatal(0, "error updating schedule.db: %s", db_strerror(err));
256 /** @brief Create a scheduled event
257 * @param ev Event loop
258 * @param actiondata Action actiondata
259 * @return Scheduled event ID or NULL on error
261 * Events are rejected if they lack the required fields, if the user
262 * is not allowed to perform them or if they are scheduled for a time
265 const char *schedule_add(ev_source *ev,
266 struct kvp *actiondata) {
271 /* TODO: handle recurring events */
272 /* Check that the required field are present */
273 for(n = 0; n < NREQUIRED; ++n) {
274 if(!kvp_get(actiondata, schedule_required[n])) {
275 error(0, "new scheduled event is missing required field '%s'",
276 schedule_required[n]);
280 /* Check that the user is allowed to do whatever it is */
281 if(schedule_lookup("[new]", actiondata) < 0)
283 when.tv_sec = atoll(kvp_get(actiondata, "when"));
285 /* Reject events in the past */
286 if(when.tv_sec <= time(0)) {
287 error(0, "new scheduled event is in the past");
292 WITH_TRANSACTION(schedule_add_tid(id, actiondata, tid));
293 } while(e == DB_KEYEXIST);
294 ev_timeout(ev, 0/*handlep*/, &when, schedule_trigger, (void *)id);
298 /******************************************************************************/
300 /** @brief Get the action data for a scheduled event
302 * @return Event data or NULL
304 struct kvp *schedule_get(const char *id) {
306 struct kvp *actiondata;
308 WITH_TRANSACTION(trackdb_getdata(trackdb_scheduledb, id, &actiondata, tid));
309 /* Check that the required field are present */
310 for(n = 0; n < NREQUIRED; ++n) {
311 if(!kvp_get(actiondata, schedule_required[n])) {
312 error(0, "scheduled event %s is missing required field '%s'",
313 id, schedule_required[n]);
320 /******************************************************************************/
322 /** @brief Delete a scheduled event
323 * @param id Event to delete
324 * @return 0 on success, non-0 if it did not exist
326 int schedule_del(const char *id) {
329 WITH_TRANSACTION(trackdb_delkey(trackdb_scheduledb, id, tid));
330 return e == 0 ? 0 : -1;
333 /******************************************************************************/
335 /** @brief Get a list of scheduled events
336 * @param neventsp Where to put count of events (or NULL)
337 * @return 0-terminate list of ID strings
339 char **schedule_list(int *neventsp) {
344 WITH_TRANSACTION(trackdb_listkeys(trackdb_scheduledb, v, tid));
350 /******************************************************************************/
352 static void schedule_play(ev_source *ev,
355 struct kvp *actiondata) {
356 const char *track = kvp_get(actiondata, "track");
357 struct queue_entry *q;
359 /* This stuff has rather a lot in common with c_play() */
361 error(0, "scheduled event %s: no track field", id);
364 if(!trackdb_exists(track)) {
365 error(0, "scheduled event %s: no such track as %s", id, track);
368 if(!(track = trackdb_resolve(track))) {
369 error(0, "scheduled event %s: cannot resolve track %s", id, track);
372 info("scheduled event %s: %s play %s", id, who, track);
373 q = queue_add(track, who, WHERE_START);
375 if(q == qhead.next && playing)
380 static void schedule_set_global(ev_source attribute((unused)) *ev,
383 struct kvp *actiondata) {
384 const char *key = kvp_get(actiondata, "key");
385 const char *value = kvp_get(actiondata, "value");
388 error(0, "scheduled event %s: no key field", id);
392 error(0, "scheduled event %s: cannot set internal global preferences (%s)",
397 info("scheduled event %s: %s set-global %s=%s", id, who, key, value);
399 info("scheduled event %s: %s set-global %s unset", id, who, key);
400 trackdb_set_global(key, value, who);
403 /** @brief Table of schedule actions
405 * Must be kept sorted.
409 void (*callback)(ev_source *ev,
410 const char *id, const char *who,
411 struct kvp *actiondata);
413 } schedule_actions[] = {
414 { "play", schedule_play, RIGHT_PLAY },
415 { "set-global", schedule_set_global, RIGHT_GLOBAL_PREFS },
418 /** @brief Look up a scheduled event
419 * @param actiondata Event description
420 * @return index in schedule_actions[] on success, -1 on error
422 * Unknown events are rejected as are those that the user is not allowed to do.
424 static int schedule_lookup(const char *id,
425 struct kvp *actiondata) {
426 const char *who = kvp_get(actiondata, "who");
427 const char *action = kvp_get(actiondata, "action");
429 struct kvp *userinfo;
433 /* Look up the action */
434 n = TABLE_FIND(schedule_actions, name, action);
436 error(0, "scheduled event %s: unrecognized action '%s'", id, action);
440 if(!(userinfo = trackdb_getuserinfo(who))) {
441 error(0, "scheduled event %s: user '%s' does not exist", id, who);
444 /* Check that they have suitable rights */
445 if(!(rights = kvp_get(userinfo, "rights"))) {
446 error(0, "scheduled event %s: user %s' has no rights???", id, who);
449 if(parse_rights(rights, &r, 1)) {
450 error(0, "scheduled event %s: user %s has invalid rights '%s'",
454 if(!(r & schedule_actions[n].right)) {
455 error(0, "scheduled event %s: user %s lacks rights for action %s",
462 /** @brief Called when an action is due */
463 static int schedule_trigger(ev_source *ev,
464 const struct timeval attribute((unused)) *now,
466 const char *action, *id = u;
467 struct kvp *actiondata = schedule_get(id);
472 /* schedule_get() enforces these being present */
473 action = kvp_get(actiondata, "action");
474 /* Look up the action */
475 n = schedule_lookup(id, actiondata);
478 /* Go ahead and do it */
479 schedule_actions[n].callback(ev, id, kvp_get(actiondata, "who"), actiondata);
481 /* TODO: rewrite recurring events for their next trigger time,
482 * rather than deleting them */