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fdca70ee RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2008 Richard Kettlewell | |
4 | * | |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
fdca70ee | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
fdca70ee RK |
8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
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. | |
14 | * | |
fdca70ee | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
fdca70ee RK |
17 | */ |
18 | ||
19 | /** @file server/schedule.c | |
20 | * @brief Scheduled events | |
21 | * | |
22 | * @ref trackdb_scheduledb is a mapping from ID strings to encoded | |
23 | * key-value pairs called 'actiondata'. | |
24 | * | |
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 | |
35 | * | |
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 | |
40 | * | |
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 | |
46 | * | |
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. | |
51 | * | |
52 | * Recurring events are NOT IMPLEMENTED yet but this is the proposed | |
53 | * interface: | |
54 | * | |
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. | |
57 | * | |
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. | |
66 | * | |
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 | |
71 | * way. | |
72 | * | |
73 | * If there are no week or year days then the event recurs every day. | |
74 | * | |
75 | * If there are both week and year days then the union of them is | |
76 | * taken, rather than the intersection. | |
77 | * | |
78 | * TODO: support recurring events. | |
79 | * | |
80 | * TODO: add disorder-dump support | |
81 | */ | |
05b75f8d | 82 | #include "disorder-server.h" |
fdca70ee RK |
83 | |
84 | static int schedule_trigger(ev_source *ev, | |
85 | const struct timeval *now, | |
86 | void *u); | |
87 | static int schedule_lookup(const char *id, | |
88 | struct kvp *actiondata); | |
89 | ||
90 | /** @brief List of required fields in a scheduled event */ | |
91 | static const char *const schedule_required[] = {"when", "who", "action"}; | |
92 | ||
93 | /** @brief Number of elements in @ref schedule_required */ | |
94 | #define NREQUIRED (int)(sizeof schedule_required / sizeof *schedule_required) | |
95 | ||
96 | /** @brief Parse a scheduled event key and data | |
97 | * @param k Pointer to key | |
59cf25c4 RK |
98 | * @param d Pointer to data |
99 | * @param idp Where to store event ID | |
100 | * @param actiondatap Where to store parsed data | |
fdca70ee RK |
101 | * @param whenp Where to store timestamp |
102 | * @return 0 on success, non-0 on error | |
103 | * | |
104 | * Rejects entries that are invalid in various ways. | |
105 | */ | |
106 | static int schedule_parse(const DBT *k, | |
107 | const DBT *d, | |
108 | char **idp, | |
109 | struct kvp **actiondatap, | |
110 | time_t *whenp) { | |
111 | char *id; | |
112 | struct kvp *actiondata; | |
113 | int n; | |
114 | ||
115 | /* Reject bogus keys */ | |
116 | if(!k->size || k->size > 128) { | |
117 | error(0, "bogus schedule.db key (%lu bytes)", (unsigned long)k->size); | |
118 | return -1; | |
119 | } | |
120 | id = xstrndup(k->data, k->size); | |
121 | actiondata = kvp_urldecode(d->data, d->size); | |
122 | /* Reject items without the required fields */ | |
123 | for(n = 0; n < NREQUIRED; ++n) { | |
124 | if(!kvp_get(actiondata, schedule_required[n])) { | |
125 | error(0, "scheduled event %s: missing required field '%s'", | |
126 | id, schedule_required[n]); | |
127 | return -1; | |
128 | } | |
129 | } | |
130 | /* Return the results */ | |
131 | if(idp) | |
132 | *idp = id; | |
133 | if(actiondatap) | |
134 | *actiondatap = actiondata; | |
135 | if(whenp) | |
136 | *whenp = (time_t)atoll(kvp_get(actiondata, "when")); | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /** @brief Delete via a cursor | |
141 | * @return 0 or @c DB_LOCK_DEADLOCK */ | |
142 | static int cdel(DBC *cursor) { | |
143 | int err; | |
144 | ||
145 | switch(err = cursor->c_del(cursor, 0)) { | |
146 | case 0: | |
147 | break; | |
148 | case DB_LOCK_DEADLOCK: | |
149 | error(0, "error deleting from schedule.db: %s", db_strerror(err)); | |
150 | break; | |
151 | default: | |
152 | fatal(0, "error deleting from schedule.db: %s", db_strerror(err)); | |
153 | } | |
154 | return err; | |
155 | } | |
156 | ||
157 | /** @brief Initialize the schedule | |
158 | * @param ev Event loop | |
159 | * @param tid Transaction ID | |
160 | * | |
161 | * Sets a callback for all action times except for junk actions that are | |
162 | * already in the past, which are discarded. | |
163 | */ | |
164 | static int schedule_init_tid(ev_source *ev, | |
165 | DB_TXN *tid) { | |
166 | DBC *cursor; | |
167 | DBT k, d; | |
168 | int err; | |
169 | ||
170 | cursor = trackdb_opencursor(trackdb_scheduledb, tid); | |
171 | while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d), | |
172 | DB_NEXT))) { | |
173 | struct timeval when; | |
174 | struct kvp *actiondata; | |
175 | char *id; | |
176 | ||
177 | /* Parse the key. We destroy bogus entries on sight. */ | |
178 | if(schedule_parse(&k, &d, &id, &actiondata, &when.tv_sec)) { | |
179 | if((err = cdel(cursor))) | |
180 | goto deadlocked; | |
181 | continue; | |
182 | } | |
183 | when.tv_usec = 0; | |
184 | /* The action might be in the past */ | |
4265e5d3 | 185 | if(when.tv_sec < xtime(0)) { |
fdca70ee RK |
186 | const char *priority = kvp_get(actiondata, "priority"); |
187 | ||
188 | if(priority && !strcmp(priority, "junk")) { | |
189 | /* Junk actions that are in the past are discarded during startup */ | |
190 | /* TODO recurring events should be handled differently here */ | |
5dc143a4 | 191 | info("junk event %s is in the past, discarding", id); |
fdca70ee RK |
192 | if(cdel(cursor)) |
193 | goto deadlocked; | |
194 | /* Skip this time */ | |
195 | continue; | |
196 | } | |
197 | } | |
198 | /* Arrange a callback when the scheduled event is due */ | |
199 | ev_timeout(ev, 0/*handlep*/, &when, schedule_trigger, id); | |
200 | } | |
201 | switch(err) { | |
202 | case DB_NOTFOUND: | |
203 | err = 0; | |
204 | break; | |
205 | case DB_LOCK_DEADLOCK: | |
206 | error(0, "error querying schedule.db: %s", db_strerror(err)); | |
207 | break; | |
208 | default: | |
209 | fatal(0, "error querying schedule.db: %s", db_strerror(err)); | |
210 | } | |
211 | deadlocked: | |
212 | if(trackdb_closecursor(cursor)) | |
213 | err = DB_LOCK_DEADLOCK; | |
214 | return err; | |
215 | } | |
216 | ||
217 | /** @brief Initialize the schedule | |
218 | * @param ev Event loop | |
219 | * | |
220 | * Sets a callback for all action times except for junk actions that are | |
221 | * already in the past, which are discarded. | |
222 | */ | |
223 | void schedule_init(ev_source *ev) { | |
224 | int e; | |
225 | WITH_TRANSACTION(schedule_init_tid(ev, tid)); | |
226 | } | |
227 | ||
228 | /******************************************************************************/ | |
229 | ||
230 | /** @brief Create a scheduled event | |
59cf25c4 | 231 | * @param id Event ID |
fdca70ee | 232 | * @param actiondata Action data |
59cf25c4 | 233 | * @param tid Containing transaction |
fdca70ee RK |
234 | */ |
235 | static int schedule_add_tid(const char *id, | |
236 | struct kvp *actiondata, | |
237 | DB_TXN *tid) { | |
238 | int err; | |
239 | DBT k, d; | |
240 | ||
241 | memset(&k, 0, sizeof k); | |
242 | k.data = (void *)id; | |
243 | k.size = strlen(id); | |
244 | switch(err = trackdb_scheduledb->put(trackdb_scheduledb, tid, &k, | |
067eeb5f RK |
245 | encode_data(&d, actiondata), |
246 | DB_NOOVERWRITE)) { | |
fdca70ee RK |
247 | case 0: |
248 | break; | |
249 | case DB_LOCK_DEADLOCK: | |
250 | error(0, "error updating schedule.db: %s", db_strerror(err)); | |
251 | return err; | |
252 | case DB_KEYEXIST: | |
253 | return err; | |
254 | default: | |
255 | fatal(0, "error updating schedule.db: %s", db_strerror(err)); | |
256 | } | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /** @brief Create a scheduled event | |
261 | * @param ev Event loop | |
262 | * @param actiondata Action actiondata | |
263 | * @return Scheduled event ID or NULL on error | |
264 | * | |
265 | * Events are rejected if they lack the required fields, if the user | |
266 | * is not allowed to perform them or if they are scheduled for a time | |
267 | * in the past. | |
268 | */ | |
067eeb5f RK |
269 | const char *schedule_add(ev_source *ev, |
270 | struct kvp *actiondata) { | |
fdca70ee | 271 | int e, n; |
067eeb5f | 272 | const char *id; |
fdca70ee RK |
273 | struct timeval when; |
274 | ||
275 | /* TODO: handle recurring events */ | |
276 | /* Check that the required field are present */ | |
277 | for(n = 0; n < NREQUIRED; ++n) { | |
278 | if(!kvp_get(actiondata, schedule_required[n])) { | |
279 | error(0, "new scheduled event is missing required field '%s'", | |
280 | schedule_required[n]); | |
281 | return 0; | |
282 | } | |
283 | } | |
284 | /* Check that the user is allowed to do whatever it is */ | |
285 | if(schedule_lookup("[new]", actiondata) < 0) | |
286 | return 0; | |
287 | when.tv_sec = atoll(kvp_get(actiondata, "when")); | |
288 | when.tv_usec = 0; | |
289 | /* Reject events in the past */ | |
4265e5d3 | 290 | if(when.tv_sec <= xtime(0)) { |
fdca70ee RK |
291 | error(0, "new scheduled event is in the past"); |
292 | return 0; | |
293 | } | |
294 | do { | |
295 | id = random_id(); | |
296 | WITH_TRANSACTION(schedule_add_tid(id, actiondata, tid)); | |
297 | } while(e == DB_KEYEXIST); | |
067eeb5f | 298 | ev_timeout(ev, 0/*handlep*/, &when, schedule_trigger, (void *)id); |
fdca70ee RK |
299 | return id; |
300 | } | |
301 | ||
302 | /******************************************************************************/ | |
303 | ||
304 | /** @brief Get the action data for a scheduled event | |
305 | * @param id Event ID | |
306 | * @return Event data or NULL | |
307 | */ | |
308 | struct kvp *schedule_get(const char *id) { | |
309 | int e, n; | |
310 | struct kvp *actiondata; | |
311 | ||
312 | WITH_TRANSACTION(trackdb_getdata(trackdb_scheduledb, id, &actiondata, tid)); | |
313 | /* Check that the required field are present */ | |
314 | for(n = 0; n < NREQUIRED; ++n) { | |
315 | if(!kvp_get(actiondata, schedule_required[n])) { | |
316 | error(0, "scheduled event %s is missing required field '%s'", | |
317 | id, schedule_required[n]); | |
318 | return 0; | |
319 | } | |
320 | } | |
321 | return actiondata; | |
322 | } | |
323 | ||
324 | /******************************************************************************/ | |
325 | ||
326 | /** @brief Delete a scheduled event | |
327 | * @param id Event to delete | |
328 | * @return 0 on success, non-0 if it did not exist | |
329 | */ | |
330 | int schedule_del(const char *id) { | |
331 | int e; | |
332 | ||
333 | WITH_TRANSACTION(trackdb_delkey(trackdb_scheduledb, id, tid)); | |
334 | return e == 0 ? 0 : -1; | |
335 | } | |
336 | ||
337 | /******************************************************************************/ | |
338 | ||
339 | /** @brief Get a list of scheduled events | |
340 | * @param neventsp Where to put count of events (or NULL) | |
341 | * @return 0-terminate list of ID strings | |
342 | */ | |
343 | char **schedule_list(int *neventsp) { | |
344 | int e; | |
345 | struct vector v[1]; | |
346 | ||
758aa6c3 | 347 | vector_init(v); |
fdca70ee RK |
348 | WITH_TRANSACTION(trackdb_listkeys(trackdb_scheduledb, v, tid)); |
349 | if(neventsp) | |
350 | *neventsp = v->nvec; | |
351 | return v->vec; | |
352 | } | |
353 | ||
354 | /******************************************************************************/ | |
355 | ||
356 | static void schedule_play(ev_source *ev, | |
357 | const char *id, | |
358 | const char *who, | |
359 | struct kvp *actiondata) { | |
360 | const char *track = kvp_get(actiondata, "track"); | |
361 | struct queue_entry *q; | |
362 | ||
363 | /* This stuff has rather a lot in common with c_play() */ | |
364 | if(!track) { | |
365 | error(0, "scheduled event %s: no track field", id); | |
366 | return; | |
367 | } | |
368 | if(!trackdb_exists(track)) { | |
369 | error(0, "scheduled event %s: no such track as %s", id, track); | |
370 | return; | |
371 | } | |
372 | if(!(track = trackdb_resolve(track))) { | |
373 | error(0, "scheduled event %s: cannot resolve track %s", id, track); | |
374 | return; | |
375 | } | |
376 | info("scheduled event %s: %s play %s", id, who, track); | |
2dc2f478 | 377 | q = queue_add(track, who, WHERE_START, origin_scheduled); |
fdca70ee RK |
378 | queue_write(); |
379 | if(q == qhead.next && playing) | |
380 | prepare(ev, q); | |
381 | play(ev); | |
382 | } | |
383 | ||
384 | static void schedule_set_global(ev_source attribute((unused)) *ev, | |
385 | const char *id, | |
386 | const char *who, | |
387 | struct kvp *actiondata) { | |
388 | const char *key = kvp_get(actiondata, "key"); | |
389 | const char *value = kvp_get(actiondata, "value"); | |
390 | ||
391 | if(!key) { | |
392 | error(0, "scheduled event %s: no key field", id); | |
393 | return; | |
394 | } | |
395 | if(key[0] == '_') { | |
396 | error(0, "scheduled event %s: cannot set internal global preferences (%s)", | |
397 | id, key); | |
398 | return; | |
399 | } | |
400 | if(value) | |
401 | info("scheduled event %s: %s set-global %s=%s", id, who, key, value); | |
402 | else | |
403 | info("scheduled event %s: %s set-global %s unset", id, who, key); | |
404 | trackdb_set_global(key, value, who); | |
405 | } | |
406 | ||
407 | /** @brief Table of schedule actions | |
408 | * | |
409 | * Must be kept sorted. | |
410 | */ | |
411 | static struct { | |
412 | const char *name; | |
413 | void (*callback)(ev_source *ev, | |
414 | const char *id, const char *who, | |
415 | struct kvp *actiondata); | |
416 | rights_type right; | |
417 | } schedule_actions[] = { | |
418 | { "play", schedule_play, RIGHT_PLAY }, | |
419 | { "set-global", schedule_set_global, RIGHT_GLOBAL_PREFS }, | |
420 | }; | |
421 | ||
422 | /** @brief Look up a scheduled event | |
59cf25c4 | 423 | * @param id Event ID |
fdca70ee RK |
424 | * @param actiondata Event description |
425 | * @return index in schedule_actions[] on success, -1 on error | |
426 | * | |
427 | * Unknown events are rejected as are those that the user is not allowed to do. | |
428 | */ | |
429 | static int schedule_lookup(const char *id, | |
430 | struct kvp *actiondata) { | |
431 | const char *who = kvp_get(actiondata, "who"); | |
432 | const char *action = kvp_get(actiondata, "action"); | |
433 | const char *rights; | |
434 | struct kvp *userinfo; | |
435 | rights_type r; | |
436 | int n; | |
437 | ||
438 | /* Look up the action */ | |
ba937f01 | 439 | n = TABLE_FIND(schedule_actions, name, action); |
fdca70ee RK |
440 | if(n < 0) { |
441 | error(0, "scheduled event %s: unrecognized action '%s'", id, action); | |
442 | return -1; | |
443 | } | |
444 | /* Find the user */ | |
445 | if(!(userinfo = trackdb_getuserinfo(who))) { | |
446 | error(0, "scheduled event %s: user '%s' does not exist", id, who); | |
447 | return -1; | |
448 | } | |
449 | /* Check that they have suitable rights */ | |
450 | if(!(rights = kvp_get(userinfo, "rights"))) { | |
451 | error(0, "scheduled event %s: user %s' has no rights???", id, who); | |
452 | return -1; | |
453 | } | |
454 | if(parse_rights(rights, &r, 1)) { | |
455 | error(0, "scheduled event %s: user %s has invalid rights '%s'", | |
456 | id, who, rights); | |
457 | return -1; | |
458 | } | |
459 | if(!(r & schedule_actions[n].right)) { | |
460 | error(0, "scheduled event %s: user %s lacks rights for action %s", | |
461 | id, who, action); | |
462 | return -1; | |
463 | } | |
464 | return n; | |
465 | } | |
466 | ||
467 | /** @brief Called when an action is due */ | |
468 | static int schedule_trigger(ev_source *ev, | |
469 | const struct timeval attribute((unused)) *now, | |
470 | void *u) { | |
471 | const char *action, *id = u; | |
472 | struct kvp *actiondata = schedule_get(id); | |
473 | int n; | |
474 | ||
475 | if(!actiondata) | |
476 | return 0; | |
477 | /* schedule_get() enforces these being present */ | |
478 | action = kvp_get(actiondata, "action"); | |
479 | /* Look up the action */ | |
480 | n = schedule_lookup(id, actiondata); | |
481 | if(n < 0) | |
482 | goto done; | |
483 | /* Go ahead and do it */ | |
484 | schedule_actions[n].callback(ev, id, kvp_get(actiondata, "who"), actiondata); | |
485 | done: | |
486 | /* TODO: rewrite recurring events for their next trigger time, | |
487 | * rather than deleting them */ | |
488 | schedule_del(id); | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* | |
493 | Local Variables: | |
494 | c-basic-offset:2 | |
495 | comment-column:40 | |
496 | fill-column:79 | |
497 | indent-tabs-mode:nil | |
498 | End: | |
499 | */ |