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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
eb525fcd | 3 | * Copyright (C) 2005, 2006, 2007 Richard Kettlewell |
460b9539 | 4 | * |
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 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include "types.h" | |
23 | ||
24 | #include <string.h> | |
25 | #include <stdio.h> | |
26 | #include <db.h> | |
27 | #include <sys/socket.h> | |
28 | #include <pcre.h> | |
29 | #include <assert.h> | |
30 | #include <unistd.h> | |
31 | #include <errno.h> | |
32 | #include <stddef.h> | |
33 | #include <sys/time.h> | |
34 | #include <sys/resource.h> | |
35 | #include <time.h> | |
2a10b70b | 36 | #include <arpa/inet.h> |
460b9539 | 37 | |
38 | #include "event.h" | |
39 | #include "mem.h" | |
40 | #include "kvp.h" | |
41 | #include "log.h" | |
42 | #include "vector.h" | |
43 | #include "trackdb.h" | |
44 | #include "configuration.h" | |
45 | #include "syscalls.h" | |
46 | #include "wstat.h" | |
47 | #include "words.h" | |
48 | #include "printf.h" | |
49 | #include "filepart.h" | |
50 | #include "trackname.h" | |
51 | #include "trackdb-int.h" | |
52 | #include "logfd.h" | |
53 | #include "cache.h" | |
54 | #include "eventlog.h" | |
55 | #include "hash.h" | |
56 | ||
57 | #define RESCAN "disorder-rescan" | |
58 | #define DEADLOCK "disorder-deadlock" | |
59 | ||
60 | static const char *getpart(const char *track, | |
61 | const char *context, | |
62 | const char *part, | |
63 | const struct kvp *p, | |
64 | int *used_db); | |
65 | static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp); | |
66 | static int trackdb_get_global_tid(const char *name, | |
67 | DB_TXN *tid, | |
68 | const char **rp); | |
2a10b70b RK |
69 | static char **trackdb_new_tid(int *ntracksp, |
70 | int maxtracks, | |
71 | DB_TXN *tid); | |
460b9539 | 72 | |
73 | const struct cache_type cache_files_type = { 86400 }; | |
74 | unsigned long cache_files_hits, cache_files_misses; | |
75 | ||
76 | /* setup and teardown ********************************************************/ | |
77 | ||
78 | static const char *home; /* home had better not change */ | |
79 | DB_ENV *trackdb_env; /* db environment */ | |
80 | DB *trackdb_tracksdb; /* the db itself */ | |
81 | DB *trackdb_prefsdb; /* preferences */ | |
82 | DB *trackdb_searchdb; /* the search database */ | |
83 | DB *trackdb_tagsdb; /* the tags database */ | |
84 | DB *trackdb_globaldb; /* global preferences */ | |
2a10b70b | 85 | DB *trackdb_noticeddb; /* when track noticed */ |
460b9539 | 86 | static pid_t db_deadlock_pid = -1; /* deadlock manager PID */ |
87 | static pid_t rescan_pid = -1; /* rescanner PID */ | |
88 | static int initialized, opened; /* state */ | |
89 | ||
90 | /* tracks matched by required_tags */ | |
91 | static char **reqtracks; | |
92 | static size_t nreqtracks; | |
93 | ||
94 | /* comparison function for keys */ | |
95 | static int compare(DB attribute((unused)) *db_, | |
96 | const DBT *a, const DBT *b) { | |
97 | return compare_path_raw(a->data, a->size, b->data, b->size); | |
98 | } | |
99 | ||
100 | /* open environment */ | |
101 | void trackdb_init(int recover) { | |
102 | int err; | |
103 | static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL }; | |
104 | ||
105 | /* sanity checks */ | |
106 | assert(initialized == 0); | |
107 | ++initialized; | |
108 | if(home) { | |
109 | if(strcmp(home, config->home)) | |
110 | fatal(0, "cannot change db home without server restart"); | |
111 | home = config->home; | |
112 | } | |
113 | ||
114 | /* create environment */ | |
115 | if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s", | |
116 | db_strerror(err)); | |
117 | if((err = trackdb_env->set_alloc(trackdb_env, | |
118 | xmalloc_noptr, xrealloc_noptr, xfree))) | |
119 | fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err)); | |
120 | if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000))) | |
121 | fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err)); | |
122 | if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000))) | |
123 | fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err)); | |
124 | if((err = trackdb_env->open(trackdb_env, config->home, | |
125 | DB_INIT_LOG | |
126 | |DB_INIT_LOCK | |
127 | |DB_INIT_MPOOL | |
128 | |DB_INIT_TXN | |
129 | |DB_CREATE | |
130 | |recover_type[recover], | |
131 | 0666))) | |
132 | fatal(0, "trackdb_env->open: %s", db_strerror(err)); | |
133 | trackdb_env->set_errpfx(trackdb_env, "DB"); | |
134 | trackdb_env->set_errfile(trackdb_env, stderr); | |
135 | trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1); | |
136 | trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1); | |
137 | trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1); | |
138 | D(("initialized database environment")); | |
139 | } | |
140 | ||
141 | /* called when deadlock manager terminates */ | |
142 | static int reap_db_deadlock(ev_source attribute((unused)) *ev, | |
143 | pid_t attribute((unused)) pid, | |
144 | int status, | |
145 | const struct rusage attribute((unused)) *rusage, | |
146 | void attribute((unused)) *u) { | |
147 | db_deadlock_pid = -1; | |
148 | if(initialized) | |
149 | fatal(0, "deadlock manager unexpectedly terminated: %s", | |
150 | wstat(status)); | |
151 | else | |
152 | D(("deadlock manager terminated: %s", wstat(status))); | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static pid_t subprogram(ev_source *ev, const char *prog) { | |
157 | pid_t pid; | |
158 | int lfd; | |
159 | ||
160 | /* If we're in the background then trap subprocess stdout/stderr */ | |
161 | if(!isatty(2)) | |
162 | lfd = logfd(ev, prog); | |
163 | else | |
164 | lfd = -1; | |
165 | if(!(pid = xfork())) { | |
166 | exitfn = _exit; | |
167 | ev_signal_atfork(ev); | |
168 | signal(SIGPIPE, SIG_DFL); | |
169 | if(lfd != -1) { | |
170 | xdup2(lfd, 1); | |
171 | xdup2(lfd, 2); | |
172 | } | |
173 | /* If we were negatively niced, undo it. We don't bother checking for | |
174 | * error, it's not that important. */ | |
175 | setpriority(PRIO_PROCESS, 0, 0); | |
176 | execlp(prog, prog, "--config", configfile, | |
177 | debugging ? "--debug" : "--no-debug", | |
178 | (char *)0); | |
179 | fatal(errno, "error invoking %s", prog); | |
180 | } | |
181 | if(lfd != -1) xclose(lfd); | |
182 | return pid; | |
183 | } | |
184 | ||
185 | /* start deadlock manager */ | |
186 | void trackdb_master(ev_source *ev) { | |
187 | assert(db_deadlock_pid == -1); | |
188 | db_deadlock_pid = subprogram(ev, DEADLOCK); | |
189 | ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0); | |
190 | D(("started deadlock manager")); | |
191 | } | |
192 | ||
193 | /* close environment */ | |
194 | void trackdb_deinit(void) { | |
195 | int err; | |
196 | ||
197 | /* sanity checks */ | |
198 | assert(initialized == 1); | |
199 | --initialized; | |
200 | ||
201 | /* close the environment */ | |
202 | if((err = trackdb_env->close(trackdb_env, 0))) | |
203 | fatal(0, "trackdb_env->close: %s", db_strerror(err)); | |
204 | ||
205 | if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0) | |
206 | fatal(errno, "error killing rescanner"); | |
207 | ||
208 | /* terminate the deadlock manager */ | |
209 | if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0) | |
210 | fatal(errno, "error killing deadlock manager"); | |
211 | db_deadlock_pid = -1; | |
212 | ||
213 | D(("deinitialized database environment")); | |
214 | } | |
215 | ||
216 | /* open a specific database */ | |
217 | static DB *open_db(const char *path, | |
218 | u_int32_t dbflags, | |
219 | DBTYPE dbtype, | |
220 | u_int32_t openflags, | |
221 | int mode) { | |
222 | int err; | |
223 | DB *db; | |
224 | ||
225 | D(("open %s", path)); | |
226 | path = config_get_file(path); | |
227 | if((err = db_create(&db, trackdb_env, 0))) | |
228 | fatal(0, "db_create %s: %s", path, db_strerror(err)); | |
229 | if(dbflags) | |
230 | if((err = db->set_flags(db, dbflags))) | |
231 | fatal(0, "db->set_flags %s: %s", path, db_strerror(err)); | |
232 | if(dbtype == DB_BTREE) | |
233 | if((err = db->set_bt_compare(db, compare))) | |
234 | fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err)); | |
235 | if((err = db->open(db, 0, path, 0, dbtype, | |
236 | openflags | DB_AUTO_COMMIT, mode))) | |
237 | fatal(0, "db->open %s: %s", path, db_strerror(err)); | |
238 | return db; | |
239 | } | |
240 | ||
241 | /* open track databases */ | |
242 | void trackdb_open(void) { | |
243 | /* sanity checks */ | |
244 | assert(opened == 0); | |
245 | ++opened; | |
246 | /* open the databases */ | |
247 | trackdb_tracksdb = open_db("tracks.db", | |
248 | DB_RECNUM, DB_BTREE, DB_CREATE, 0666); | |
249 | trackdb_searchdb = open_db("search.db", | |
250 | DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666); | |
251 | trackdb_tagsdb = open_db("tags.db", | |
252 | DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666); | |
253 | trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666); | |
254 | trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666); | |
2a10b70b RK |
255 | trackdb_noticeddb = open_db("noticed.db", |
256 | DB_DUPSORT, DB_BTREE, DB_CREATE, 0666); | |
460b9539 | 257 | D(("opened databases")); |
258 | } | |
259 | ||
260 | /* close track databases */ | |
261 | void trackdb_close(void) { | |
262 | int err; | |
263 | ||
264 | /* sanity checks */ | |
265 | assert(opened == 1); | |
266 | --opened; | |
267 | if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0))) | |
268 | fatal(0, "error closing tracks.db: %s", db_strerror(err)); | |
269 | if((err = trackdb_searchdb->close(trackdb_searchdb, 0))) | |
270 | fatal(0, "error closing search.db: %s", db_strerror(err)); | |
271 | if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0))) | |
272 | fatal(0, "error closing tags.db: %s", db_strerror(err)); | |
273 | if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0))) | |
274 | fatal(0, "error closing prefs.db: %s", db_strerror(err)); | |
275 | if((err = trackdb_globaldb->close(trackdb_globaldb, 0))) | |
276 | fatal(0, "error closing global.db: %s", db_strerror(err)); | |
2a10b70b RK |
277 | if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0))) |
278 | fatal(0, "error closing noticed.db: %s", db_strerror(err)); | |
460b9539 | 279 | trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0; |
280 | trackdb_tagsdb = trackdb_globaldb = 0; | |
281 | D(("closed databases")); | |
282 | } | |
283 | ||
284 | /* generic db routines *******************************************************/ | |
285 | ||
286 | /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or | |
287 | * DB_LOCK_DEADLOCK. */ | |
288 | int trackdb_getdata(DB *db, | |
289 | const char *track, | |
290 | struct kvp **kp, | |
291 | DB_TXN *tid) { | |
292 | int err; | |
293 | DBT key, data; | |
294 | ||
295 | switch(err = db->get(db, tid, make_key(&key, track), | |
296 | prepare_data(&data), 0)) { | |
297 | case 0: | |
298 | *kp = kvp_urldecode(data.data, data.size); | |
299 | return 0; | |
300 | case DB_NOTFOUND: | |
301 | *kp = 0; | |
302 | return err; | |
303 | case DB_LOCK_DEADLOCK: | |
304 | error(0, "error querying database: %s", db_strerror(err)); | |
305 | return err; | |
306 | default: | |
307 | fatal(0, "error querying database: %s", db_strerror(err)); | |
308 | } | |
309 | } | |
310 | ||
311 | /* encode and store a database entry. Returns 0, DB_KEYEXIST or | |
312 | * DB_LOCK_DEADLOCK. */ | |
313 | int trackdb_putdata(DB *db, | |
314 | const char *track, | |
315 | const struct kvp *k, | |
316 | DB_TXN *tid, | |
317 | u_int32_t flags) { | |
318 | int err; | |
319 | DBT key, data; | |
320 | ||
321 | switch(err = db->put(db, tid, make_key(&key, track), | |
322 | encode_data(&data, k), flags)) { | |
323 | case 0: | |
324 | case DB_KEYEXIST: | |
325 | return err; | |
326 | case DB_LOCK_DEADLOCK: | |
327 | error(0, "error updating database: %s", db_strerror(err)); | |
328 | return err; | |
329 | default: | |
330 | fatal(0, "error updating database: %s", db_strerror(err)); | |
331 | } | |
332 | } | |
333 | ||
334 | /* delete a database entry */ | |
335 | int trackdb_delkey(DB *db, | |
336 | const char *track, | |
337 | DB_TXN *tid) { | |
338 | int err; | |
339 | ||
340 | DBT key; | |
341 | switch(err = db->del(db, tid, make_key(&key, track), 0)) { | |
342 | case 0: | |
343 | case DB_NOTFOUND: | |
344 | return 0; | |
345 | case DB_LOCK_DEADLOCK: | |
346 | error(0, "error updating database: %s", db_strerror(err)); | |
347 | return err; | |
348 | default: | |
349 | fatal(0, "error updating database: %s", db_strerror(err)); | |
350 | } | |
351 | } | |
352 | ||
353 | /* open a database cursor */ | |
354 | DBC *trackdb_opencursor(DB *db, DB_TXN *tid) { | |
355 | int err; | |
356 | DBC *c; | |
357 | ||
358 | switch(err = db->cursor(db, tid, &c, 0)) { | |
359 | case 0: break; | |
360 | default: fatal(0, "error creating cursor: %s", db_strerror(err)); | |
361 | } | |
362 | return c; | |
363 | } | |
364 | ||
365 | /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */ | |
366 | int trackdb_closecursor(DBC *c) { | |
367 | int err; | |
368 | ||
369 | if(!c) return 0; | |
370 | switch(err = c->c_close(c)) { | |
371 | case 0: | |
372 | return err; | |
373 | case DB_LOCK_DEADLOCK: | |
374 | error(0, "error closing cursor: %s", db_strerror(err)); | |
375 | return err; | |
376 | default: | |
377 | fatal(0, "error closing cursor: %s", db_strerror(err)); | |
378 | } | |
379 | } | |
380 | ||
381 | /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */ | |
382 | int trackdb_delkeydata(DB *db, | |
383 | const char *word, | |
384 | const char *track, | |
385 | DB_TXN *tid) { | |
386 | int err; | |
387 | DBC *c; | |
388 | DBT key, data; | |
389 | ||
390 | c = trackdb_opencursor(db, tid); | |
391 | switch(err = c->c_get(c, make_key(&key, word), | |
392 | make_key(&data, track), DB_GET_BOTH)) { | |
393 | case 0: | |
394 | switch(err = c->c_del(c, 0)) { | |
395 | case 0: | |
396 | break; | |
397 | case DB_KEYEMPTY: | |
398 | err = 0; | |
399 | break; | |
400 | case DB_LOCK_DEADLOCK: | |
401 | error(0, "error updating database: %s", db_strerror(err)); | |
402 | break; | |
403 | default: | |
404 | fatal(0, "c->c_del: %s", db_strerror(err)); | |
405 | } | |
406 | break; | |
407 | case DB_NOTFOUND: | |
408 | break; | |
409 | case DB_LOCK_DEADLOCK: | |
410 | error(0, "error updating database: %s", db_strerror(err)); | |
411 | break; | |
412 | default: | |
413 | fatal(0, "c->c_get: %s", db_strerror(err)); | |
414 | } | |
415 | if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK; | |
416 | return err; | |
417 | } | |
418 | ||
419 | /* start a transaction */ | |
420 | DB_TXN *trackdb_begin_transaction(void) { | |
421 | DB_TXN *tid; | |
422 | int err; | |
423 | ||
424 | if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0))) | |
425 | fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err)); | |
426 | return tid; | |
427 | } | |
428 | ||
429 | /* abort transaction */ | |
430 | void trackdb_abort_transaction(DB_TXN *tid) { | |
431 | int err; | |
432 | ||
433 | if(tid) | |
434 | if((err = tid->abort(tid))) | |
435 | fatal(0, "tid->abort: %s", db_strerror(err)); | |
436 | } | |
437 | ||
438 | /* commit transaction */ | |
439 | void trackdb_commit_transaction(DB_TXN *tid) { | |
440 | int err; | |
441 | ||
442 | if((err = tid->commit(tid, 0))) | |
443 | fatal(0, "tid->commit: %s", db_strerror(err)); | |
444 | } | |
445 | ||
446 | /* search/tags shared code ***************************************************/ | |
447 | ||
448 | /* comparison function used by dedupe() */ | |
449 | static int wordcmp(const void *a, const void *b) { | |
450 | return strcmp(*(const char **)a, *(const char **)b); | |
451 | } | |
452 | ||
453 | /* sort and de-dupe VEC */ | |
454 | static char **dedupe(char **vec, int nvec) { | |
455 | int m, n; | |
456 | ||
457 | qsort(vec, nvec, sizeof (char *), wordcmp); | |
458 | m = n = 0; | |
459 | if(nvec) { | |
460 | vec[m++] = vec[0]; | |
461 | for(n = 1; n < nvec; ++n) | |
462 | if(strcmp(vec[n], vec[m - 1])) | |
463 | vec[m++] = vec[n]; | |
464 | } | |
465 | vec[m] = 0; | |
466 | return vec; | |
467 | } | |
468 | ||
469 | /* update a key/track database. Returns 0 or DB_DEADLOCK. */ | |
470 | static int register_word(DB *db, const char *what, | |
471 | const char *track, const char *word, | |
472 | DB_TXN *tid) { | |
473 | int err; | |
474 | DBT key, data; | |
475 | ||
476 | switch(err = db->put(db, tid, make_key(&key, word), | |
477 | make_key(&data, track), DB_NODUPDATA)) { | |
478 | case 0: | |
479 | case DB_KEYEXIST: | |
480 | return 0; | |
481 | case DB_LOCK_DEADLOCK: | |
482 | error(0, "error updating %s.db: %s", what, db_strerror(err)); | |
483 | return err; | |
484 | default: | |
485 | fatal(0, "error updating %s.db: %s", what, db_strerror(err)); | |
486 | } | |
487 | } | |
488 | ||
489 | /* search primitives *********************************************************/ | |
490 | ||
491 | /* return true iff NAME is a trackname_display_ pref */ | |
492 | static int is_display_pref(const char *name) { | |
493 | static const char prefix[] = "trackname_display_"; | |
494 | return !strncmp(name, prefix, (sizeof prefix) - 1); | |
495 | } | |
496 | ||
497 | /* compute the words of a track name */ | |
498 | static char **track_to_words(const char *track, | |
499 | const struct kvp *p) { | |
500 | struct vector v; | |
501 | char **w; | |
502 | int nw; | |
a8747834 | 503 | const char *rootless = track_rootless(track); |
460b9539 | 504 | |
a8747834 | 505 | if(!rootless) |
506 | rootless = track; /* bodge */ | |
460b9539 | 507 | vector_init(&v); |
a8747834 | 508 | if((w = words(casefold(strip_extension(rootless)), &nw))) |
460b9539 | 509 | vector_append_many(&v, w, nw); |
510 | ||
511 | for(; p; p = p->next) | |
512 | if(is_display_pref(p->name)) | |
513 | if((w = words(casefold(p->value), &nw))) | |
514 | vector_append_many(&v, w, nw); | |
515 | vector_terminate(&v); | |
516 | return dedupe(v.vec, v.nvec); | |
517 | } | |
518 | ||
519 | /* return nonzero iff WORD is a stopword */ | |
520 | static int stopword(const char *word) { | |
521 | int n; | |
522 | ||
523 | for(n = 0; n < config->stopword.n | |
524 | && strcmp(word, config->stopword.s[n]); ++n) | |
525 | ; | |
526 | return n < config->stopword.n; | |
527 | } | |
528 | ||
529 | /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */ | |
530 | static int register_search_word(const char *track, const char *word, | |
531 | DB_TXN *tid) { | |
532 | if(stopword(word)) return 0; | |
533 | return register_word(trackdb_searchdb, "search", track, word, tid); | |
534 | } | |
535 | ||
536 | /* Tags **********************************************************************/ | |
537 | ||
538 | /* Return nonzero if C is a valid tag character */ | |
539 | static int tagchar(int c) { | |
540 | switch(c) { | |
541 | case ',': | |
542 | return 0; | |
543 | default: | |
544 | return c >= ' '; | |
545 | } | |
546 | } | |
547 | ||
548 | /* Parse and de-dupe a tag list. If S=0 then assumes "". */ | |
549 | static char **parsetags(const char *s) { | |
550 | const char *t; | |
551 | struct vector v; | |
552 | ||
553 | vector_init(&v); | |
554 | if(s) { | |
555 | /* skip initial separators */ | |
556 | while(*s && (!tagchar(*s) || *s == ' ')) | |
557 | ++s; | |
558 | while(*s) { | |
559 | /* find the extent of the tag */ | |
560 | t = s; | |
561 | while(*s && tagchar(*s)) | |
562 | ++s; | |
563 | /* strip trailing spaces */ | |
564 | while(s > t && s[-1] == ' ') | |
565 | --s; | |
566 | vector_append(&v, xstrndup(t, s - t)); | |
567 | /* skip intermediate and trailing separators */ | |
568 | while(*s && (!tagchar(*s) || *s == ' ')) | |
569 | ++s; | |
570 | } | |
571 | } | |
572 | vector_terminate(&v); | |
573 | return dedupe(v.vec, v.nvec); | |
574 | } | |
575 | ||
576 | /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */ | |
577 | static int register_tag(const char *track, const char *tag, DB_TXN *tid) { | |
578 | return register_word(trackdb_tagsdb, "tags", track, tag, tid); | |
579 | } | |
580 | ||
581 | /* aliases *******************************************************************/ | |
582 | ||
583 | /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If | |
584 | * there is no alias sets *aliasp to 0. */ | |
585 | static int compute_alias(char **aliasp, | |
586 | const char *track, | |
587 | const struct kvp *p, | |
588 | DB_TXN *tid) { | |
589 | struct dynstr d; | |
590 | const char *s = config->alias, *t, *expansion, *part; | |
591 | int c, used_db = 0, slash_prefix, err; | |
592 | struct kvp *at; | |
137e36ed | 593 | const char *const root = find_track_root(track); |
460b9539 | 594 | |
137e36ed | 595 | if(!root) { |
596 | /* Bodge for tracks with no root */ | |
597 | *aliasp = 0; | |
598 | return 0; | |
599 | } | |
460b9539 | 600 | dynstr_init(&d); |
137e36ed | 601 | dynstr_append_string(&d, root); |
460b9539 | 602 | while((c = (unsigned char)*s++)) { |
603 | if(c != '{') { | |
604 | dynstr_append(&d, c); | |
605 | continue; | |
606 | } | |
607 | if((slash_prefix = (*s == '/'))) | |
608 | s++; | |
609 | t = strchr(s, '}'); | |
610 | assert(t != 0); /* validated at startup */ | |
611 | part = xstrndup(s, t - s); | |
612 | expansion = getpart(track, "display", part, p, &used_db); | |
613 | if(*expansion) { | |
614 | if(slash_prefix) dynstr_append(&d, '/'); | |
615 | dynstr_append_string(&d, expansion); | |
616 | } | |
617 | s = t + 1; /* skip {part} */ | |
618 | } | |
619 | /* only admit to the alias if we used the db... */ | |
620 | if(!used_db) { | |
621 | *aliasp = 0; | |
622 | return 0; | |
623 | } | |
624 | dynstr_terminate(&d); | |
625 | /* ...and the answer differs from the original... */ | |
626 | if(!strcmp(track, d.vec)) { | |
627 | *aliasp = 0; | |
628 | return 0; | |
629 | } | |
630 | /* ...and there isn't already a different track with that name (including as | |
631 | * an alias) */ | |
632 | switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) { | |
633 | case 0: | |
460b9539 | 634 | if((s = kvp_get(at, "_alias_for")) |
635 | && !strcmp(s, track)) { | |
636 | case DB_NOTFOUND: | |
460b9539 | 637 | *aliasp = d.vec; |
638 | } else { | |
460b9539 | 639 | *aliasp = 0; |
640 | } | |
641 | return 0; | |
642 | default: | |
643 | return err; | |
644 | } | |
645 | } | |
646 | ||
647 | /* get track and prefs data (if tp/pp not null pointers). Returns 0 on | |
648 | * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK. | |
649 | * Always sets the return values, even if only to null pointers. */ | |
650 | static int gettrackdata(const char *track, | |
651 | struct kvp **tp, | |
652 | struct kvp **pp, | |
653 | const char **actualp, | |
654 | unsigned flags, | |
655 | #define GTD_NOALIAS 0x0001 | |
656 | DB_TXN *tid) { | |
657 | int err; | |
658 | const char *actual = track; | |
659 | struct kvp *t = 0, *p = 0; | |
660 | ||
661 | if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done; | |
662 | if((actual = kvp_get(t, "_alias_for"))) { | |
663 | if(flags & GTD_NOALIAS) { | |
664 | error(0, "alias passed to gettrackdata where real path required"); | |
665 | abort(); | |
666 | } | |
667 | if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done; | |
668 | } else | |
669 | actual = track; | |
670 | assert(actual != 0); | |
671 | if(pp) { | |
672 | if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK) | |
673 | goto done; | |
674 | } | |
675 | err = 0; | |
676 | done: | |
677 | if(actualp) *actualp = actual; | |
678 | if(tp) *tp = t; | |
679 | if(pp) *pp = p; | |
680 | return err; | |
681 | } | |
682 | ||
683 | /* trackdb_notice() **********************************************************/ | |
684 | ||
2a10b70b RK |
685 | /** @brief notice a possiby new track |
686 | * @return @c DB_NOTFOUND if new, 0 if already known | |
687 | */ | |
460b9539 | 688 | int trackdb_notice(const char *track, |
689 | const char *path) { | |
690 | int err; | |
691 | DB_TXN *tid; | |
692 | ||
693 | for(;;) { | |
694 | tid = trackdb_begin_transaction(); | |
695 | err = trackdb_notice_tid(track, path, tid); | |
696 | if((err == DB_LOCK_DEADLOCK)) goto fail; | |
697 | break; | |
698 | fail: | |
699 | trackdb_abort_transaction(tid); | |
700 | } | |
701 | trackdb_commit_transaction(tid); | |
702 | return err; | |
703 | } | |
704 | ||
2a10b70b RK |
705 | /** @brief notice a possiby new track |
706 | * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also | |
707 | */ | |
460b9539 | 708 | int trackdb_notice_tid(const char *track, |
709 | const char *path, | |
710 | DB_TXN *tid) { | |
711 | int err, n; | |
712 | struct kvp *t, *a, *p; | |
713 | int t_changed, ret; | |
714 | char *alias, **w; | |
2a10b70b | 715 | |
460b9539 | 716 | /* notice whether the tracks.db entry changes */ |
717 | t_changed = 0; | |
718 | /* get any existing tracks entry */ | |
719 | if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK) | |
720 | return err; | |
2a10b70b | 721 | ret = err; /* 0 or DB_NOTFOUND */ |
460b9539 | 722 | /* this is a real track */ |
723 | t_changed += kvp_set(&t, "_alias_for", 0); | |
724 | t_changed += kvp_set(&t, "_path", path); | |
725 | /* if we have an alias record it in the database */ | |
726 | if((err = compute_alias(&alias, track, p, tid))) return err; | |
727 | if(alias) { | |
728 | /* won't overwrite someone else's alias as compute_alias() checks */ | |
729 | D(("%s: alias %s", track, alias)); | |
730 | a = 0; | |
731 | kvp_set(&a, "_alias_for", track); | |
732 | if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err; | |
733 | } | |
734 | /* update search.db */ | |
735 | w = track_to_words(track, p); | |
736 | for(n = 0; w[n]; ++n) | |
737 | if((err = register_search_word(track, w[n], tid))) | |
738 | return err; | |
739 | /* update tags.db */ | |
740 | w = parsetags(kvp_get(p, "tags")); | |
741 | for(n = 0; w[n]; ++n) | |
742 | if((err = register_tag(track, w[n], tid))) | |
743 | return err; | |
744 | reqtracks = 0; | |
745 | /* only store the tracks.db entry if it has changed */ | |
746 | if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))) | |
747 | return err; | |
2a10b70b RK |
748 | if(ret == DB_NOTFOUND) { |
749 | uint32_t timestamp[2]; | |
750 | time_t now; | |
751 | DBT key, data; | |
752 | ||
753 | time(&now); | |
754 | timestamp[0] = htonl((uint64_t)now >> 32); | |
755 | timestamp[1] = htonl((uint32_t)now); | |
756 | memset(&key, 0, sizeof key); | |
757 | key.data = timestamp; | |
758 | key.size = sizeof timestamp; | |
759 | switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key, | |
760 | make_key(&data, track), 0)) { | |
761 | case 0: break; | |
762 | case DB_LOCK_DEADLOCK: return err; | |
763 | default: fatal(0, "error updating noticed.db: %s", db_strerror(err)); | |
764 | } | |
765 | } | |
460b9539 | 766 | return ret; |
767 | } | |
768 | ||
769 | /* trackdb_obsolete() ********************************************************/ | |
770 | ||
771 | /* obsolete a track */ | |
772 | int trackdb_obsolete(const char *track, DB_TXN *tid) { | |
773 | int err, n; | |
774 | struct kvp *p; | |
775 | char *alias, **w; | |
776 | ||
777 | if((err = gettrackdata(track, 0, &p, 0, | |
778 | GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK) | |
779 | return err; | |
780 | else if(err == DB_NOTFOUND) return 0; | |
781 | /* compute the alias, if any, and delete it */ | |
782 | if(compute_alias(&alias, track, p, tid)) return err; | |
783 | if(alias) { | |
784 | /* if the alias points to some other track then compute_alias won't | |
785 | * return it */ | |
786 | if(trackdb_delkey(trackdb_tracksdb, alias, tid)) | |
787 | return err; | |
788 | } | |
789 | /* update search.db */ | |
790 | w = track_to_words(track, p); | |
791 | for(n = 0; w[n]; ++n) | |
792 | if(trackdb_delkeydata(trackdb_searchdb, | |
793 | w[n], track, tid) == DB_LOCK_DEADLOCK) | |
794 | return err; | |
795 | /* update tags.db */ | |
796 | w = parsetags(kvp_get(p, "tags")); | |
797 | for(n = 0; w[n]; ++n) | |
798 | if(trackdb_delkeydata(trackdb_tagsdb, | |
799 | w[n], track, tid) == DB_LOCK_DEADLOCK) | |
800 | return err; | |
801 | reqtracks = 0; | |
802 | /* update tracks.db */ | |
803 | if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK) | |
804 | return err; | |
805 | /* We don't delete the prefs, so they survive temporary outages of the | |
806 | * (possibly virtual) track filesystem */ | |
807 | return 0; | |
808 | } | |
809 | ||
810 | /* trackdb_stats() ***********************************************************/ | |
811 | ||
812 | #define H(name) { #name, offsetof(DB_HASH_STAT, name) } | |
813 | #define B(name) { #name, offsetof(DB_BTREE_STAT, name) } | |
814 | ||
815 | static const struct statinfo { | |
816 | const char *name; | |
817 | size_t offset; | |
818 | } statinfo_hash[] = { | |
819 | H(hash_magic), | |
820 | H(hash_version), | |
821 | H(hash_nkeys), | |
822 | H(hash_ndata), | |
823 | H(hash_pagesize), | |
824 | H(hash_ffactor), | |
825 | H(hash_buckets), | |
826 | H(hash_free), | |
827 | H(hash_bfree), | |
828 | H(hash_bigpages), | |
829 | H(hash_big_bfree), | |
830 | H(hash_overflows), | |
831 | H(hash_ovfl_free), | |
832 | H(hash_dup), | |
833 | H(hash_dup_free), | |
834 | }, statinfo_btree[] = { | |
835 | B(bt_magic), | |
836 | B(bt_version), | |
837 | B(bt_nkeys), | |
838 | B(bt_ndata), | |
839 | B(bt_pagesize), | |
840 | B(bt_minkey), | |
841 | B(bt_re_len), | |
842 | B(bt_re_pad), | |
843 | B(bt_levels), | |
844 | B(bt_int_pg), | |
845 | B(bt_leaf_pg), | |
846 | B(bt_dup_pg), | |
847 | B(bt_over_pg), | |
848 | B(bt_free), | |
849 | B(bt_int_pgfree), | |
850 | B(bt_leaf_pgfree), | |
851 | B(bt_dup_pgfree), | |
852 | B(bt_over_pgfree), | |
853 | }; | |
854 | ||
855 | /* look up stats for DB */ | |
856 | static int get_stats(struct vector *v, | |
857 | DB *database, | |
858 | const struct statinfo *si, | |
859 | size_t nsi, | |
860 | DB_TXN *tid) { | |
861 | void *sp; | |
862 | size_t n; | |
863 | char *str; | |
864 | int err; | |
865 | ||
866 | if(database) { | |
867 | switch(err = database->stat(database, tid, &sp, 0)) { | |
868 | case 0: | |
869 | break; | |
870 | case DB_LOCK_DEADLOCK: | |
871 | error(0, "error querying database: %s", db_strerror(err)); | |
872 | return err; | |
873 | default: | |
874 | fatal(0, "error querying database: %s", db_strerror(err)); | |
875 | } | |
876 | for(n = 0; n < nsi; ++n) { | |
877 | byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name, | |
878 | (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset)); | |
879 | vector_append(v, str); | |
880 | } | |
881 | } | |
882 | return 0; | |
883 | } | |
884 | ||
885 | struct search_entry { | |
886 | char *word; | |
887 | int n; | |
888 | }; | |
889 | ||
890 | /* find the top COUNT words in the search database */ | |
891 | static int search_league(struct vector *v, int count, DB_TXN *tid) { | |
892 | struct search_entry *se; | |
893 | DBT k, d; | |
894 | DBC *cursor; | |
895 | int err, n = 0, nse = 0, i; | |
896 | char *word = 0; | |
897 | size_t wl = 0; | |
898 | char *str; | |
899 | ||
900 | cursor = trackdb_opencursor(trackdb_searchdb, tid); | |
901 | se = xmalloc(count * sizeof *se); | |
902 | while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d), | |
903 | DB_NEXT))) { | |
904 | if(word && wl == k.size && !strncmp(word, k.data, wl)) | |
905 | ++n; | |
906 | else { | |
907 | #define FINALIZE() do { \ | |
908 | if(word && (nse < count || n > se[nse - 1].n)) { \ | |
909 | if(nse == count) \ | |
910 | i = nse - 1; \ | |
911 | else \ | |
912 | i = nse++; \ | |
913 | while(i > 0 && n > se[i - 1].n) \ | |
914 | --i; \ | |
915 | memmove(&se[i + 1], &se[i], (nse - i) * sizeof *se); \ | |
916 | se[i].word = word; \ | |
917 | se[i].n = n; \ | |
918 | } \ | |
919 | } while(0) | |
920 | FINALIZE(); | |
921 | word = xstrndup(k.data, wl = k.size); | |
922 | n = 1; | |
923 | } | |
924 | } | |
925 | switch(err) { | |
926 | case DB_NOTFOUND: | |
927 | err = 0; | |
928 | break; | |
929 | case DB_LOCK_DEADLOCK: | |
930 | error(0, "error querying search database: %s", db_strerror(err)); | |
931 | break; | |
932 | default: | |
933 | fatal(0, "error querying search database: %s", db_strerror(err)); | |
934 | } | |
935 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; | |
936 | if(err) return err; | |
937 | FINALIZE(); | |
938 | byte_xasprintf(&str, "Top %d search words:", nse); | |
939 | vector_append(v, str); | |
940 | for(i = 0; i < nse; ++i) { | |
941 | byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word); | |
942 | vector_append(v, str); | |
943 | } | |
944 | return 0; | |
945 | } | |
946 | ||
947 | #define SI(what) statinfo_##what, \ | |
948 | sizeof statinfo_##what / sizeof (struct statinfo) | |
949 | ||
950 | /* return a list of database stats */ | |
951 | char **trackdb_stats(int *nstatsp) { | |
952 | DB_TXN *tid; | |
953 | struct vector v; | |
954 | char *s; | |
955 | ||
956 | vector_init(&v); | |
957 | for(;;) { | |
958 | tid = trackdb_begin_transaction(); | |
959 | v.nvec = 0; | |
960 | vector_append(&v, (char *)"Tracks database stats:"); | |
961 | if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail; | |
962 | vector_append(&v, (char *)""); | |
963 | vector_append(&v, (char *)"Search database stats:"); | |
964 | if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail; | |
965 | vector_append(&v, (char *)""); | |
966 | vector_append(&v, (char *)"Prefs database stats:"); | |
967 | if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail; | |
968 | vector_append(&v, (char *)""); | |
969 | if(search_league(&v, 10, tid)) goto fail; | |
970 | vector_append(&v, (char *)""); | |
971 | vector_append(&v, (char *)"Server stats:"); | |
972 | byte_xasprintf(&s, "track lookup cache hits: %lu", cache_files_hits); | |
973 | vector_append(&v, (char *)s); | |
974 | byte_xasprintf(&s, "track lookup cache misses: %lu", cache_files_misses); | |
975 | vector_append(&v, (char *)s); | |
976 | vector_terminate(&v); | |
977 | break; | |
978 | fail: | |
979 | trackdb_abort_transaction(tid); | |
980 | } | |
981 | trackdb_commit_transaction(tid); | |
982 | if(nstatsp) *nstatsp = v.nvec; | |
983 | return v.vec; | |
984 | } | |
985 | ||
986 | /* set a pref (remove if value=0) */ | |
987 | int trackdb_set(const char *track, | |
988 | const char *name, | |
989 | const char *value) { | |
990 | struct kvp *t, *p, *a; | |
991 | DB_TXN *tid; | |
992 | int err, cmp; | |
993 | char *oldalias, *newalias, **oldtags = 0, **newtags; | |
994 | ||
f26f062a | 995 | if(value) { |
996 | /* TODO: if value matches default then set value=0 */ | |
997 | } | |
998 | ||
460b9539 | 999 | for(;;) { |
1000 | tid = trackdb_begin_transaction(); | |
1001 | if((err = gettrackdata(track, &t, &p, 0, | |
1002 | 0, tid)) == DB_LOCK_DEADLOCK) | |
1003 | goto fail; | |
1004 | if(err == DB_NOTFOUND) break; | |
1005 | if(name[0] == '_') { | |
1006 | if(kvp_set(&t, name, value)) | |
1007 | if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)) | |
1008 | goto fail; | |
1009 | } else { | |
1010 | /* get the old alias name */ | |
1011 | if(compute_alias(&oldalias, track, p, tid)) goto fail; | |
1012 | /* get the old tags */ | |
1013 | if(!strcmp(name, "tags")) | |
1014 | oldtags = parsetags(kvp_get(p, "tags")); | |
1015 | /* set the value */ | |
1016 | if(kvp_set(&p, name, value)) | |
1017 | if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0)) | |
1018 | goto fail; | |
1019 | /* compute the new alias name */ | |
1020 | if((err = compute_alias(&newalias, track, p, tid))) goto fail; | |
1021 | /* check whether alias has changed */ | |
1022 | if(!(oldalias == newalias | |
1023 | || (oldalias && newalias && !strcmp(oldalias, newalias)))) { | |
1024 | /* adjust alias records to fit change */ | |
1025 | if(oldalias | |
1026 | && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail; | |
1027 | if(newalias) { | |
1028 | a = 0; | |
1029 | kvp_set(&a, "_alias_for", track); | |
1030 | if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail; | |
1031 | } | |
1032 | } | |
1033 | /* check whether tags have changed */ | |
1034 | if(!strcmp(name, "tags")) { | |
1035 | newtags = parsetags(value); | |
1036 | while(*oldtags || *newtags) { | |
1037 | if(*oldtags && *newtags) { | |
1038 | cmp = strcmp(*oldtags, *newtags); | |
1039 | if(!cmp) { | |
1040 | /* keeping this tag */ | |
1041 | ++oldtags; | |
1042 | ++newtags; | |
1043 | } else if(cmp < 0) | |
1044 | /* old tag fits into a gap in the new list, so delete old */ | |
1045 | goto delete_old; | |
1046 | else | |
1047 | /* new tag fits into a gap in the old list, so insert new */ | |
1048 | goto insert_new; | |
1049 | } else if(*oldtags) { | |
1050 | /* we've run out of new tags, so remaining old ones are to be | |
1051 | * deleted */ | |
1052 | delete_old: | |
1053 | if(trackdb_delkeydata(trackdb_tagsdb, | |
1054 | *oldtags, track, tid) == DB_LOCK_DEADLOCK) | |
1055 | goto fail; | |
1056 | ++oldtags; | |
1057 | } else { | |
1058 | /* we've run out of old tags, so remainig new ones are to be | |
1059 | * inserted */ | |
1060 | insert_new: | |
1061 | if(register_tag(track, *newtags, tid)) goto fail; | |
1062 | ++newtags; | |
1063 | } | |
1064 | } | |
1065 | reqtracks = 0; | |
1066 | } | |
1067 | } | |
1068 | err = 0; | |
1069 | break; | |
1070 | fail: | |
1071 | trackdb_abort_transaction(tid); | |
1072 | } | |
1073 | trackdb_commit_transaction(tid); | |
1074 | return err == 0 ? 0 : -1; | |
1075 | } | |
1076 | ||
1077 | /* get a pref */ | |
1078 | const char *trackdb_get(const char *track, | |
1079 | const char *name) { | |
1080 | return kvp_get(trackdb_get_all(track), name); | |
1081 | } | |
1082 | ||
1083 | /* get all prefs as a 0-terminated array */ | |
1084 | struct kvp *trackdb_get_all(const char *track) { | |
1085 | struct kvp *t, *p, **pp; | |
1086 | DB_TXN *tid; | |
1087 | ||
1088 | for(;;) { | |
1089 | tid = trackdb_begin_transaction(); | |
1090 | if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK) | |
1091 | goto fail; | |
1092 | break; | |
1093 | fail: | |
1094 | trackdb_abort_transaction(tid); | |
1095 | } | |
1096 | trackdb_commit_transaction(tid); | |
1097 | for(pp = &p; *pp; pp = &(*pp)->next) | |
1098 | ; | |
1099 | *pp = t; | |
1100 | return p; | |
1101 | } | |
1102 | ||
1103 | /* resolve alias */ | |
1104 | const char *trackdb_resolve(const char *track) { | |
1105 | DB_TXN *tid; | |
1106 | const char *actual; | |
1107 | ||
1108 | for(;;) { | |
1109 | tid = trackdb_begin_transaction(); | |
1110 | if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK) | |
1111 | goto fail; | |
1112 | break; | |
1113 | fail: | |
1114 | trackdb_abort_transaction(tid); | |
1115 | } | |
1116 | trackdb_commit_transaction(tid); | |
1117 | return actual; | |
1118 | } | |
1119 | ||
1120 | int trackdb_isalias(const char *track) { | |
1121 | const char *actual = trackdb_resolve(track); | |
1122 | ||
1123 | return strcmp(actual, track); | |
1124 | } | |
1125 | ||
1126 | /* test whether a track exists (perhaps an alias) */ | |
1127 | int trackdb_exists(const char *track) { | |
1128 | DB_TXN *tid; | |
1129 | int err; | |
1130 | ||
1131 | for(;;) { | |
1132 | tid = trackdb_begin_transaction(); | |
1133 | /* unusually, here we want the return value */ | |
1134 | if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK) | |
1135 | goto fail; | |
1136 | break; | |
1137 | fail: | |
1138 | trackdb_abort_transaction(tid); | |
1139 | } | |
1140 | trackdb_commit_transaction(tid); | |
1141 | return (err == 0); | |
1142 | } | |
1143 | ||
1144 | /* return the list of tags */ | |
1145 | char **trackdb_alltags(void) { | |
1146 | DB_TXN *tid; | |
1147 | int err; | |
1148 | char **taglist; | |
1149 | ||
1150 | for(;;) { | |
1151 | tid = trackdb_begin_transaction(); | |
1152 | err = trackdb_alltags_tid(tid, &taglist); | |
1153 | if(!err) break; | |
1154 | trackdb_abort_transaction(tid); | |
1155 | } | |
1156 | trackdb_commit_transaction(tid); | |
1157 | return taglist; | |
1158 | } | |
1159 | ||
1160 | static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) { | |
1161 | struct vector v; | |
1162 | DBC *c; | |
1163 | DBT k, d; | |
1164 | int err; | |
1165 | ||
1166 | vector_init(&v); | |
1167 | c = trackdb_opencursor(trackdb_tagsdb, tid); | |
1168 | memset(&k, 0, sizeof k); | |
1169 | while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP))) | |
1170 | vector_append(&v, xstrndup(k.data, k.size)); | |
1171 | switch(err) { | |
1172 | case DB_NOTFOUND: | |
1173 | break; | |
1174 | case DB_LOCK_DEADLOCK: | |
1175 | return err; | |
1176 | default: | |
1177 | fatal(0, "c->c_get: %s", db_strerror(err)); | |
1178 | } | |
1179 | if((err = trackdb_closecursor(c))) return err; | |
1180 | vector_terminate(&v); | |
1181 | *taglistp = v.vec; | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | /* return 1 iff sorted tag lists A and B have at least one member in common */ | |
1186 | static int tag_intersection(char **a, char **b) { | |
1187 | int cmp; | |
1188 | ||
1189 | /* Same sort of logic as trackdb_set() above */ | |
1190 | while(*a && *b) { | |
1191 | if(!(cmp = strcmp(*a, *b))) return 1; | |
1192 | else if(cmp < 0) ++a; | |
1193 | else ++b; | |
1194 | } | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | /* Check whether a track is suitable for random play. Returns 0 if it is, | |
6aba3f6c RK |
1199 | * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us |
1200 | * that. */ | |
460b9539 | 1201 | static int check_suitable(const char *track, |
1202 | DB_TXN *tid, | |
1203 | char **required_tags, | |
1204 | char **prohibited_tags) { | |
1205 | char **track_tags; | |
1206 | time_t last, now; | |
1207 | struct kvp *p, *t; | |
1208 | const char *pick_at_random, *played_time; | |
1209 | ||
6aba3f6c RK |
1210 | /* don't pick tracks that aren't in any surviving collection (for instance |
1211 | * you've edited the config but the rescan hasn't done its job yet) */ | |
1212 | if(!find_track_root(track)) { | |
1213 | info("found track not in any collection: %s", track); | |
1214 | return DB_NOTFOUND; | |
1215 | } | |
460b9539 | 1216 | /* don't pick aliases - only pick the canonical form */ |
1217 | if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK) | |
1218 | return DB_LOCK_DEADLOCK; | |
1219 | if(kvp_get(t, "_alias_for")) | |
1220 | return DB_NOTFOUND; | |
1221 | /* check that random play is not suppressed for this track */ | |
1222 | if((pick_at_random = kvp_get(p, "pick_at_random")) | |
1223 | && !strcmp(pick_at_random, "0")) | |
1224 | return DB_NOTFOUND; | |
1225 | /* don't pick a track that's been played in the last 8 hours */ | |
1226 | if((played_time = kvp_get(p, "played_time"))) { | |
1227 | last = atoll(played_time); | |
1228 | now = time(0); | |
1229 | if(now < last + 8 * 3600) /* TODO configurable */ | |
1230 | return DB_NOTFOUND; | |
1231 | } | |
1232 | track_tags = parsetags(kvp_get(p, "tags")); | |
1233 | /* check that no prohibited tag is present for this track */ | |
1234 | if(prohibited_tags && tag_intersection(track_tags, prohibited_tags)) | |
1235 | return DB_NOTFOUND; | |
1236 | /* check that at least one required tags is present for this track */ | |
1237 | if(*required_tags && !tag_intersection(track_tags, required_tags)) | |
1238 | return DB_NOTFOUND; | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* attempt to pick a random non-alias track */ | |
1243 | const char *trackdb_random(int tries) { | |
1244 | DBT key, data; | |
1245 | DB_BTREE_STAT *sp; | |
1246 | int err, n; | |
1247 | DB_TXN *tid; | |
1248 | const char *track, *candidate; | |
1249 | db_recno_t r; | |
1250 | const char *tags; | |
1251 | char **required_tags, **prohibited_tags, **tp; | |
1252 | hash *h; | |
1253 | DBC *c = 0; | |
1254 | ||
1255 | for(;;) { | |
1256 | tid = trackdb_begin_transaction(); | |
1257 | if((err = trackdb_get_global_tid("required-tags", tid, &tags))) | |
1258 | goto fail; | |
1259 | required_tags = parsetags(tags); | |
1260 | if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags))) | |
1261 | goto fail; | |
1262 | prohibited_tags = parsetags(tags); | |
1263 | track = 0; | |
1264 | if(*required_tags) { | |
1265 | /* Bung all the suitable tracks into a hash and convert to a list of keys | |
1266 | * (to eliminate duplicates). We cache this list since it is possible | |
1267 | * that it will be very large. */ | |
1268 | if(!reqtracks) { | |
1269 | h = hash_new(0); | |
1270 | for(tp = required_tags; *tp; ++tp) { | |
1271 | c = trackdb_opencursor(trackdb_tagsdb, tid); | |
1272 | memset(&key, 0, sizeof key); | |
1273 | key.data = *tp; | |
1274 | key.size = strlen(*tp); | |
1275 | n = 0; | |
1276 | err = c->c_get(c, &key, prepare_data(&data), DB_SET); | |
1277 | while(err == 0) { | |
1278 | hash_add(h, xstrndup(data.data, data.size), 0, | |
1279 | HASH_INSERT_OR_REPLACE); | |
1280 | ++n; | |
1281 | err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP); | |
1282 | } | |
1283 | switch(err) { | |
1284 | case 0: | |
1285 | case DB_NOTFOUND: | |
1286 | break; | |
1287 | case DB_LOCK_DEADLOCK: | |
1288 | goto fail; | |
1289 | default: | |
1290 | fatal(0, "error querying tags.db: %s", db_strerror(err)); | |
1291 | } | |
1292 | trackdb_closecursor(c); | |
1293 | c = 0; | |
1294 | if(!n) | |
1295 | error(0, "required tag %s does not match any tracks", *tp); | |
1296 | } | |
1297 | nreqtracks = hash_count(h); | |
1298 | reqtracks = hash_keys(h); | |
1299 | } | |
1300 | while(nreqtracks && !track && tries-- > 0) { | |
1301 | r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0)); | |
1302 | candidate = reqtracks[r]; | |
1303 | switch(check_suitable(candidate, tid, | |
1304 | required_tags, prohibited_tags)) { | |
1305 | case 0: | |
1306 | track = candidate; | |
1307 | break; | |
1308 | case DB_NOTFOUND: | |
1309 | break; | |
1310 | case DB_LOCK_DEADLOCK: | |
1311 | goto fail; | |
1312 | } | |
1313 | } | |
1314 | } else { | |
1315 | /* No required tags. We pick random record numbers in the database | |
1316 | * instead. */ | |
58a4416c | 1317 | switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) { |
460b9539 | 1318 | case 0: |
1319 | break; | |
1320 | case DB_LOCK_DEADLOCK: | |
1321 | error(0, "error querying tracks.db: %s", db_strerror(err)); | |
1322 | goto fail; | |
1323 | default: | |
1324 | fatal(0, "error querying tracks.db: %s", db_strerror(err)); | |
1325 | } | |
1326 | if(!sp->bt_nkeys) | |
1327 | error(0, "cannot pick tracks at random from an empty database"); | |
1328 | while(sp->bt_nkeys && !track && tries-- > 0) { | |
1329 | /* record numbers count from 1 upwards */ | |
1330 | r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0)); | |
1331 | memset(&key, sizeof key, 0); | |
1332 | key.flags = DB_DBT_MALLOC; | |
1333 | key.size = sizeof r; | |
1334 | key.data = &r; | |
1335 | switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data), | |
1336 | DB_SET_RECNO)) { | |
1337 | case 0: | |
1338 | break; | |
1339 | case DB_LOCK_DEADLOCK: | |
1340 | error(0, "error querying tracks.db: %s", db_strerror(err)); | |
1341 | goto fail; | |
1342 | default: | |
1343 | fatal(0, "error querying tracks.db: %s", db_strerror(err)); | |
1344 | } | |
1345 | candidate = xstrndup(key.data, key.size); | |
1346 | switch(check_suitable(candidate, tid, | |
1347 | required_tags, prohibited_tags)) { | |
1348 | case 0: | |
1349 | track = candidate; | |
1350 | break; | |
1351 | case DB_NOTFOUND: | |
1352 | break; | |
1353 | case DB_LOCK_DEADLOCK: | |
1354 | goto fail; | |
1355 | } | |
1356 | } | |
1357 | } | |
1358 | break; | |
1359 | fail: | |
1360 | trackdb_closecursor(c); | |
1361 | c = 0; | |
1362 | trackdb_abort_transaction(tid); | |
1363 | } | |
1364 | trackdb_commit_transaction(tid); | |
1365 | if(!track) | |
1366 | error(0, "could not pick a random track"); | |
1367 | return track; | |
1368 | } | |
1369 | ||
1370 | /* get a track name given the prefs. Set *used_db to 1 if we got the answer | |
1371 | * from the prefs. */ | |
1372 | static const char *getpart(const char *track, | |
1373 | const char *context, | |
1374 | const char *part, | |
1375 | const struct kvp *p, | |
1376 | int *used_db) { | |
1377 | const char *result; | |
1378 | char *pref; | |
1379 | ||
1380 | byte_xasprintf(&pref, "trackname_%s_%s", context, part); | |
1381 | if((result = kvp_get(p, pref))) | |
1382 | *used_db = 1; | |
1383 | else | |
1384 | result = trackname_part(track, context, part); | |
1385 | assert(result != 0); | |
1386 | return result; | |
1387 | } | |
1388 | ||
1389 | /* get a track name part, like trackname_part(), but taking the database into | |
1390 | * account. */ | |
1391 | const char *trackdb_getpart(const char *track, | |
1392 | const char *context, | |
1393 | const char *part) { | |
1394 | struct kvp *p; | |
1395 | DB_TXN *tid; | |
1396 | char *pref; | |
1397 | const char *actual; | |
1398 | int used_db, err; | |
1399 | ||
1400 | /* construct the full pref */ | |
1401 | byte_xasprintf(&pref, "trackname_%s_%s", context, part); | |
1402 | for(;;) { | |
1403 | tid = trackdb_begin_transaction(); | |
1404 | if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK) | |
1405 | goto fail; | |
1406 | break; | |
1407 | fail: | |
1408 | trackdb_abort_transaction(tid); | |
1409 | } | |
1410 | trackdb_commit_transaction(tid); | |
1411 | return getpart(actual, context, part, p, &used_db); | |
1412 | } | |
1413 | ||
1414 | /* get the raw path name for @track@ (might be an alias) */ | |
1415 | const char *trackdb_rawpath(const char *track) { | |
1416 | DB_TXN *tid; | |
1417 | struct kvp *t; | |
1418 | const char *path; | |
1419 | ||
1420 | for(;;) { | |
1421 | tid = trackdb_begin_transaction(); | |
1422 | if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK) | |
1423 | goto fail; | |
1424 | break; | |
1425 | fail: | |
1426 | trackdb_abort_transaction(tid); | |
1427 | } | |
1428 | trackdb_commit_transaction(tid); | |
1429 | if(!(path = kvp_get(t, "_path"))) path = track; | |
1430 | return path; | |
1431 | } | |
1432 | ||
1433 | /* trackdb_list **************************************************************/ | |
1434 | ||
1435 | /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually | |
1436 | * readable at some point */ | |
1437 | ||
1438 | /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE. | |
1439 | * If RE is a null pointer then it matches everything. */ | |
1440 | static int track_matches(size_t dl, const char *track, size_t tl, | |
1441 | const pcre *re) { | |
1442 | int ovec[3], rc; | |
1443 | ||
1444 | if(!re) | |
1445 | return 1; | |
1446 | track += dl + 1; | |
1447 | tl -= (dl + 1); | |
1448 | switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) { | |
1449 | case PCRE_ERROR_NOMATCH: return 0; | |
1450 | default: | |
1451 | if(rc < 0) { | |
1452 | error(0, "pcre_exec returned %d, subject '%s'", rc, track); | |
1453 | return 0; | |
1454 | } | |
1455 | return 1; | |
1456 | } | |
1457 | } | |
1458 | ||
1459 | static int do_list(struct vector *v, const char *dir, | |
1460 | enum trackdb_listable what, const pcre *re, DB_TXN *tid) { | |
1461 | DBC *cursor; | |
1462 | DBT k, d; | |
1463 | size_t dl; | |
1464 | char *ptr; | |
1465 | int err; | |
1466 | size_t l, last_dir_len = 0; | |
1467 | char *last_dir = 0, *track, *alias; | |
1468 | struct kvp *p; | |
1469 | ||
1470 | dl = strlen(dir); | |
1471 | cursor = trackdb_opencursor(trackdb_tracksdb, tid); | |
1472 | make_key(&k, dir); | |
1473 | prepare_data(&d); | |
1474 | /* find the first key >= dir */ | |
1475 | err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE); | |
1476 | /* keep going while we're dealing with <dir/anything> */ | |
1477 | while(err == 0 | |
1478 | && k.size > dl | |
1479 | && ((char *)k.data)[dl] == '/' | |
1480 | && !memcmp(k.data, dir, dl)) { | |
1481 | ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1)); | |
1482 | if(ptr) { | |
1483 | /* we have <dir/component/anything>, so <dir/component> is a directory */ | |
1484 | l = ptr - (char *)k.data; | |
1485 | if(what & trackdb_directories) | |
1486 | if(!(last_dir | |
1487 | && l == last_dir_len | |
1488 | && !memcmp(last_dir, k.data, l))) { | |
1489 | last_dir = xstrndup(k.data, last_dir_len = l); | |
1490 | if(track_matches(dl, k.data, l, re)) | |
1491 | vector_append(v, last_dir); | |
1492 | } | |
1493 | } else { | |
1494 | /* found a plain file */ | |
1495 | if((what & trackdb_files)) { | |
1496 | track = xstrndup(k.data, k.size); | |
1497 | if((err = trackdb_getdata(trackdb_prefsdb, | |
1498 | track, &p, tid)) == DB_LOCK_DEADLOCK) | |
1499 | goto deadlocked; | |
1500 | /* if this file has an alias in the same directory then we skip it */ | |
1501 | if((err = compute_alias(&alias, track, p, tid))) | |
1502 | goto deadlocked; | |
1503 | if(!(alias && !strcmp(d_dirname(alias), d_dirname(track)))) | |
1504 | if(track_matches(dl, k.data, k.size, re)) | |
1505 | vector_append(v, track); | |
1506 | } | |
1507 | } | |
1508 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); | |
1509 | } | |
1510 | switch(err) { | |
1511 | case 0: | |
1512 | break; | |
1513 | case DB_NOTFOUND: | |
1514 | err = 0; | |
1515 | break; | |
1516 | case DB_LOCK_DEADLOCK: | |
1517 | error(0, "error querying database: %s", db_strerror(err)); | |
1518 | break; | |
1519 | default: | |
1520 | fatal(0, "error querying database: %s", db_strerror(err)); | |
1521 | } | |
1522 | deadlocked: | |
1523 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; | |
1524 | return err; | |
1525 | } | |
1526 | ||
1527 | /* return the directories or files below @dir@ */ | |
1528 | char **trackdb_list(const char *dir, int *np, enum trackdb_listable what, | |
1529 | const pcre *re) { | |
1530 | DB_TXN *tid; | |
1531 | int n; | |
1532 | struct vector v; | |
1533 | ||
1534 | vector_init(&v); | |
1535 | for(;;) { | |
1536 | tid = trackdb_begin_transaction(); | |
1537 | v.nvec = 0; | |
1538 | if(dir) { | |
1539 | if(do_list(&v, dir, what, re, tid)) | |
1540 | goto fail; | |
1541 | } else { | |
1542 | for(n = 0; n < config->collection.n; ++n) | |
1543 | if(do_list(&v, config->collection.s[n].root, what, re, tid)) | |
1544 | goto fail; | |
1545 | } | |
1546 | break; | |
1547 | fail: | |
1548 | trackdb_abort_transaction(tid); | |
1549 | } | |
1550 | trackdb_commit_transaction(tid); | |
1551 | vector_terminate(&v); | |
1552 | if(np) | |
1553 | *np = v.nvec; | |
1554 | return v.vec; | |
1555 | } | |
1556 | ||
1557 | /* If S is tag:something, return something. Else return 0. */ | |
1558 | static const char *checktag(const char *s) { | |
1559 | if(!strncmp(s, "tag:", 4)) | |
1560 | return s + 4; | |
1561 | else | |
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | /* return a list of tracks containing all of the words given. If you | |
1566 | * ask for only stopwords you get no tracks. */ | |
1567 | char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) { | |
1568 | const char **w, *best = 0, *tag; | |
1569 | char **twords, **tags; | |
1570 | int i, j, n, err, what; | |
1571 | DBC *cursor = 0; | |
1572 | DBT k, d; | |
1573 | struct vector u, v; | |
1574 | DB_TXN *tid; | |
1575 | struct kvp *p; | |
1576 | int ntags = 0; | |
1577 | DB *db; | |
1578 | const char *dbname; | |
1579 | ||
1580 | *ntracks = 0; /* for early returns */ | |
1581 | /* casefold all the words */ | |
1582 | w = xmalloc(nwordlist * sizeof (char *)); | |
1583 | for(n = 0; n < nwordlist; ++n) { | |
1584 | w[n] = casefold(wordlist[n]); | |
1585 | if(checktag(w[n])) ++ntags; /* count up tags */ | |
1586 | } | |
1587 | /* find the longest non-stopword */ | |
1588 | for(n = 0; n < nwordlist; ++n) | |
1589 | if(!stopword(w[n]) && !checktag(w[n])) | |
1590 | if(!best || strlen(w[n]) > strlen(best)) | |
1591 | best = w[n]; | |
1592 | /* TODO: we should at least in principal be able to identify the word or tag | |
1593 | * with the least matches in log time, and choose that as our primary search | |
1594 | * term. */ | |
1595 | if(ntags && !best) { | |
1596 | /* Only tags are listed. We limit to the first and narrow down with the | |
1597 | * rest. */ | |
1598 | best = checktag(w[0]); | |
1599 | db = trackdb_tagsdb; | |
1600 | dbname = "tags"; | |
1601 | } else if(best) { | |
1602 | /* We can limit to some word. */ | |
1603 | db = trackdb_searchdb; | |
1604 | dbname = "search"; | |
1605 | } else { | |
1606 | /* Only stopwords */ | |
1607 | return 0; | |
1608 | } | |
1609 | vector_init(&u); | |
1610 | vector_init(&v); | |
1611 | for(;;) { | |
1612 | tid = trackdb_begin_transaction(); | |
1613 | /* find all the tracks that have that word */ | |
1614 | make_key(&k, best); | |
1615 | prepare_data(&d); | |
1616 | what = DB_SET; | |
1617 | v.nvec = 0; | |
1618 | cursor = trackdb_opencursor(db, tid); | |
1619 | while(!(err = cursor->c_get(cursor, &k, &d, what))) { | |
1620 | vector_append(&v, xstrndup(d.data, d.size)); | |
1621 | what = DB_NEXT_DUP; | |
1622 | } | |
1623 | switch(err) { | |
1624 | case DB_NOTFOUND: | |
1625 | err = 0; | |
1626 | break; | |
1627 | case DB_LOCK_DEADLOCK: | |
1628 | error(0, "error querying %s database: %s", dbname, db_strerror(err)); | |
1629 | break; | |
1630 | default: | |
1631 | fatal(0, "error querying %s database: %s", dbname, db_strerror(err)); | |
1632 | } | |
1633 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; | |
1634 | cursor = 0; | |
1635 | /* do a naive search over that (hopefuly fairly small) list of tracks */ | |
1636 | u.nvec = 0; | |
1637 | for(n = 0; n < v.nvec; ++n) { | |
1638 | if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)) | |
1639 | goto fail; | |
1640 | else if(err) { | |
1641 | error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err)); | |
1642 | continue; | |
1643 | } | |
1644 | twords = track_to_words(v.vec[n], p); | |
1645 | tags = parsetags(kvp_get(p, "tags")); | |
1646 | for(i = 0; i < nwordlist; ++i) { | |
1647 | if((tag = checktag(w[i]))) { | |
1648 | /* Track must have this tag */ | |
1649 | for(j = 0; tags[j]; ++j) | |
1650 | if(!strcmp(tag, tags[j])) break; /* tag found */ | |
1651 | if(!tags[j]) break; /* tag not found */ | |
1652 | } else { | |
1653 | /* Track must contain this word */ | |
1654 | for(j = 0; twords[j]; ++j) | |
1655 | if(!strcmp(w[i], twords[j])) break; /* word found */ | |
1656 | if(!twords[j]) break; /* word not found */ | |
1657 | } | |
1658 | } | |
1659 | if(i >= nwordlist) /* all words found */ | |
1660 | vector_append(&u, v.vec[n]); | |
1661 | } | |
1662 | break; | |
1663 | fail: | |
1664 | trackdb_closecursor(cursor); | |
1665 | cursor = 0; | |
1666 | trackdb_abort_transaction(tid); | |
1667 | info("retrying search"); | |
1668 | } | |
1669 | trackdb_commit_transaction(tid); | |
1670 | vector_terminate(&u); | |
1671 | if(ntracks) | |
1672 | *ntracks = u.nvec; | |
1673 | return u.vec; | |
1674 | } | |
1675 | ||
1676 | /* trackdb_scan **************************************************************/ | |
1677 | ||
1678 | int trackdb_scan(const char *root, | |
1679 | int (*callback)(const char *track, | |
1680 | struct kvp *data, | |
1681 | void *u, | |
1682 | DB_TXN *tid), | |
1683 | void *u, | |
1684 | DB_TXN *tid) { | |
1685 | DBC *cursor; | |
1686 | DBT k, d; | |
d1694464 | 1687 | const size_t root_len = root ? strlen(root) : 0; |
1688 | int err, cberr; | |
460b9539 | 1689 | struct kvp *data; |
d1694464 | 1690 | const char *track; |
460b9539 | 1691 | |
1692 | cursor = trackdb_opencursor(trackdb_tracksdb, tid); | |
d1694464 | 1693 | if(root) |
1694 | err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d), | |
1695 | DB_SET_RANGE); | |
1696 | else { | |
1697 | memset(&k, 0, sizeof k); | |
1698 | err = cursor->c_get(cursor, &k, prepare_data(&d), | |
1699 | DB_FIRST); | |
1700 | } | |
460b9539 | 1701 | while(!err) { |
d1694464 | 1702 | if(!root |
1703 | || (k.size > root_len | |
1704 | && !strncmp(k.data, root, root_len) | |
1705 | && ((char *)k.data)[root_len] == '/')) { | |
460b9539 | 1706 | data = kvp_urldecode(d.data, d.size); |
d1694464 | 1707 | if(kvp_get(data, "_path")) { |
1708 | track = xstrndup(k.data, k.size); | |
1709 | /* Advance to the next track before the callback so that the callback | |
1710 | * may safely delete the track */ | |
1711 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); | |
1712 | if((cberr = callback(track, data, u, tid))) { | |
1713 | err = cberr; | |
460b9539 | 1714 | break; |
d1694464 | 1715 | } |
1716 | } else | |
1717 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); | |
460b9539 | 1718 | } else |
1719 | break; | |
1720 | } | |
1721 | trackdb_closecursor(cursor); | |
1722 | switch(err) { | |
1723 | case EINTR: | |
1724 | return err; | |
1725 | case 0: | |
1726 | case DB_NOTFOUND: | |
1727 | return 0; | |
1728 | case DB_LOCK_DEADLOCK: | |
1729 | error(0, "c->c_get: %s", db_strerror(err)); | |
1730 | return err; | |
1731 | default: | |
1732 | fatal(0, "c->c_get: %s", db_strerror(err)); | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | /* trackdb_rescan ************************************************************/ | |
1737 | ||
1738 | /* called when the rescanner terminates */ | |
1739 | static int reap_rescan(ev_source attribute((unused)) *ev, | |
1740 | pid_t pid, | |
1741 | int status, | |
1742 | const struct rusage attribute((unused)) *rusage, | |
1743 | void attribute((unused)) *u) { | |
1744 | if(pid == rescan_pid) rescan_pid = -1; | |
1745 | if(status) | |
1746 | error(0, "disorderd-rescan: %s", wstat(status)); | |
1747 | else | |
1748 | D(("disorderd-rescan terminate: %s", wstat(status))); | |
1749 | /* Our cache of file lookups is out of date now */ | |
1750 | cache_clean(&cache_files_type); | |
e025abff | 1751 | eventlog("rescanned", (char *)0); |
460b9539 | 1752 | return 0; |
1753 | } | |
1754 | ||
1755 | void trackdb_rescan(ev_source *ev) { | |
1756 | if(rescan_pid != -1) { | |
1757 | error(0, "rescan already underway"); | |
1758 | return; | |
1759 | } | |
1760 | rescan_pid = subprogram(ev, RESCAN); | |
1761 | ev_child(ev, rescan_pid, 0, reap_rescan, 0); | |
1762 | D(("started rescanner")); | |
1763 | ||
1764 | } | |
1765 | ||
1766 | int trackdb_rescan_cancel(void) { | |
1767 | if(rescan_pid == -1) return 0; | |
1768 | if(kill(rescan_pid, SIGTERM) < 0) | |
1769 | fatal(errno, "error killing rescanner"); | |
1770 | rescan_pid = -1; | |
1771 | return 1; | |
1772 | } | |
1773 | ||
1774 | /* global prefs **************************************************************/ | |
1775 | ||
1776 | void trackdb_set_global(const char *name, | |
1777 | const char *value, | |
1778 | const char *who) { | |
1779 | DB_TXN *tid; | |
1780 | DBT k, d; | |
1781 | int err; | |
1782 | int state; | |
1783 | ||
1784 | memset(&k, 0, sizeof k); | |
1785 | memset(&d, 0, sizeof d); | |
1786 | k.data = (void *)name; | |
1787 | k.size = strlen(name); | |
1788 | if(value) { | |
1789 | d.data = (void *)value; | |
1790 | d.size = strlen(value); | |
1791 | } | |
1792 | for(;;) { | |
1793 | tid = trackdb_begin_transaction(); | |
1794 | if(value) | |
1795 | err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0); | |
1796 | else | |
1797 | err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0); | |
1798 | if(!err || err == DB_NOTFOUND) break; | |
1799 | if(err != DB_LOCK_DEADLOCK) | |
1800 | fatal(0, "error updating database: %s", db_strerror(err)); | |
1801 | trackdb_abort_transaction(tid); | |
1802 | } | |
1803 | trackdb_commit_transaction(tid); | |
1804 | /* log important state changes */ | |
1805 | if(!strcmp(name, "playing")) { | |
1806 | state = !value || !strcmp(value, "yes"); | |
1807 | info("playing %s by %s", | |
1808 | state ? "enabled" : "disabled", | |
1809 | who ? who : "-"); | |
1810 | eventlog("state", state ? "enable_play" : "disable_play", (char *)0); | |
1811 | } | |
1812 | if(!strcmp(name, "random-play")) { | |
1813 | state = !value || !strcmp(value, "yes"); | |
1814 | info("random play %s by %s", | |
1815 | state ? "enabled" : "disabled", | |
1816 | who ? who : "-"); | |
1817 | eventlog("state", state ? "enable_random" : "disable_random", (char *)0); | |
1818 | } | |
1819 | if(!strcmp(name, "required-tags")) | |
1820 | reqtracks = 0; | |
1821 | } | |
1822 | ||
1823 | const char *trackdb_get_global(const char *name) { | |
1824 | DB_TXN *tid; | |
1825 | int err; | |
1826 | const char *r; | |
1827 | ||
1828 | for(;;) { | |
1829 | tid = trackdb_begin_transaction(); | |
1830 | if(!(err = trackdb_get_global_tid(name, tid, &r))) | |
1831 | break; | |
1832 | trackdb_abort_transaction(tid); | |
1833 | } | |
1834 | trackdb_commit_transaction(tid); | |
1835 | return r; | |
1836 | } | |
1837 | ||
1838 | static int trackdb_get_global_tid(const char *name, | |
1839 | DB_TXN *tid, | |
1840 | const char **rp) { | |
1841 | DBT k, d; | |
1842 | int err; | |
1843 | ||
1844 | memset(&k, 0, sizeof k); | |
1845 | k.data = (void *)name; | |
1846 | k.size = strlen(name); | |
1847 | switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k, | |
1848 | prepare_data(&d), 0)) { | |
1849 | case 0: | |
1850 | *rp = xstrndup(d.data, d.size); | |
1851 | return 0; | |
1852 | case DB_NOTFOUND: | |
1853 | *rp = 0; | |
1854 | return 0; | |
1855 | case DB_LOCK_DEADLOCK: | |
1856 | return err; | |
1857 | default: | |
1858 | fatal(0, "error updating database: %s", db_strerror(err)); | |
1859 | } | |
1860 | } | |
1861 | ||
2a10b70b RK |
1862 | /** @brief Retrieve the most recently added tracks |
1863 | * @param ntracksp Where to put count, or 0 | |
1864 | * @param maxtracks Maximum number of tracks to retrieve | |
1865 | * @return null-terminated array of track names | |
1866 | * | |
1867 | * The most recently added track is first in the array. | |
1868 | */ | |
1869 | char **trackdb_new(int *ntracksp, | |
1870 | int maxtracks) { | |
1871 | DB_TXN *tid; | |
1872 | char **tracks; | |
1873 | ||
1874 | for(;;) { | |
1875 | tid = trackdb_begin_transaction(); | |
1876 | tracks = trackdb_new_tid(ntracksp, maxtracks, tid); | |
1877 | if(tracks) | |
1878 | break; | |
1879 | trackdb_abort_transaction(tid); | |
1880 | } | |
1881 | trackdb_commit_transaction(tid); | |
1882 | return tracks; | |
1883 | } | |
1884 | ||
1885 | /** @brief Retrieve the most recently added tracks | |
1886 | * @param ntracksp Where to put count, or 0 | |
1887 | * @param maxtracks Maximum number of tracks to retrieve, or 0 for all | |
1888 | * @param tid Transaction ID | |
1889 | * @return null-terminated array of track names, or NULL on deadlock | |
1890 | * | |
1891 | * The most recently added track is first in the array. | |
1892 | */ | |
1893 | static char **trackdb_new_tid(int *ntracksp, | |
1894 | int maxtracks, | |
1895 | DB_TXN *tid) { | |
1896 | DBC *c; | |
1897 | DBT k, d; | |
1898 | int err = 0; | |
1899 | struct vector tracks[1]; | |
1900 | ||
1901 | vector_init(tracks); | |
1902 | c = trackdb_opencursor(trackdb_noticeddb, tid); | |
1903 | while((maxtracks <= 0 || tracks->nvec < maxtracks) | |
1904 | && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV))) | |
1905 | vector_append(tracks, xstrndup(d.data, d.size)); | |
1906 | switch(err) { | |
1907 | case 0: /* hit maxtracks */ | |
1908 | case DB_NOTFOUND: /* ran out of tracks */ | |
1909 | break; | |
1910 | case DB_LOCK_DEADLOCK: | |
1911 | trackdb_closecursor(c); | |
1912 | return 0; | |
1913 | default: | |
1914 | fatal(0, "error reading noticed.db: %s", db_strerror(err)); | |
1915 | } | |
1916 | if((err = trackdb_closecursor(c))) | |
1917 | return 0; /* deadlock */ | |
1918 | vector_terminate(tracks); | |
1919 | if(ntracksp) | |
1920 | *ntracksp = tracks->nvec; | |
1921 | return tracks->vec; | |
1922 | } | |
1923 | ||
460b9539 | 1924 | /* tidying up ****************************************************************/ |
1925 | ||
1926 | void trackdb_gc(void) { | |
1927 | int err; | |
1928 | char **logfiles; | |
1929 | ||
1930 | if((err = trackdb_env->txn_checkpoint(trackdb_env, | |
1931 | config->checkpoint_kbyte, | |
1932 | config->checkpoint_min, | |
1933 | 0))) | |
1934 | fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err)); | |
1935 | if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE))) | |
1936 | fatal(0, "trackdb_env->log_archive: %s", db_strerror(err)); | |
1937 | /* This makes catastrophic recovery impossible. However, the user can still | |
1938 | * preserve the important data by using disorder-dump to snapshot their | |
1939 | * prefs, and later to restore it. This is likely to have much small | |
1940 | * long-term storage requirements than record the db logfiles. */ | |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | Local Variables: | |
1945 | c-basic-offset:2 | |
1946 | comment-column:40 | |
1947 | fill-column:79 | |
1948 | indent-tabs-mode:nil | |
1949 | End: | |
1950 | */ |