2 * This file is part of DisOrder
3 * Copyright (C) 2005, 2006, 2007 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 2 of the License, or
8 * (at your option) any later version.
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.
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
20 /** @file server/trackdb.c
21 * @brief Track database
23 * This file is getting in desparate need of splitting up...
32 #include <sys/socket.h>
39 #include <sys/resource.h>
41 #include <arpa/inet.h>
54 #include "configuration.h"
59 #include "trackname.h"
60 #include "trackdb-int.h"
69 #define RESCAN "disorder-rescan"
70 #define DEADLOCK "disorder-deadlock"
72 static const char *getpart(const char *track,
77 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp);
78 static char **trackdb_new_tid(int *ntracksp,
81 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid);
82 static char *normalize_tag(const char *s, size_t ns);
84 const struct cache_type cache_files_type = { 86400 };
85 unsigned long cache_files_hits, cache_files_misses;
87 /** @brief Set by trackdb_open() */
88 int trackdb_existing_database;
90 /* setup and teardown ********************************************************/
92 static const char *home; /* home had better not change */
93 DB_ENV *trackdb_env; /* db environment */
95 /** @brief The tracks database
96 * - Keys are UTF-8(NFC(unicode(path name)))
97 * - Values are encoded key-value pairs
98 * - Data is reconstructable data about tracks that currently exist
100 DB *trackdb_tracksdb;
102 /** @brief The preferences database
104 * - Keys are UTF-8(NFC(unicode(path name)))
105 * - Values are encoded key-value pairs
106 * - Data is user data about tracks (that might not exist any more)
107 * and cannot be reconstructed
111 /** @brief The search database
113 * - Keys are UTF-8(NFKC(casefold(search term)))
114 * - Values are UTF-8(NFC(unicode(path name)))
115 * - There can be more than one value per key
116 * - Presence of key,value means that path matches the search terms
117 * - Only tracks fond in @ref tracks_tracksdb are represented here
118 * - This database can be reconstructed, it contains no user data
120 DB *trackdb_searchdb;
122 /** @brief The tags database
124 * - Keys are UTF-8(NFKC(casefold(tag)))
125 * - Values are UTF-8(NFC(unicode(path name)))
126 * - There can be more than one value per key
127 * - Presence of key,value means that path matches the tag
128 * - This is always in sync with the tags preference
129 * - This database can be reconstructed, it contains no user data
131 DB *trackdb_tagsdb; /* the tags database */
133 /** @brief The global preferences database
134 * - Keys are UTF-8(NFC(preference))
135 * - Values are global preference values
136 * - Data is user data and cannot be reconstructed
138 DB *trackdb_globaldb; /* global preferences */
140 /** @brief The noticed database
141 * - Keys are 64-bit big-endian timestamps
142 * - Values are UTF-8(NFC(unicode(path name)))
143 * - There can be more than one value per key
144 * - Presence of key,value means that path was added at the given time
145 * - Data cannot be reconstructed (but isn't THAT important)
147 DB *trackdb_noticeddb; /* when track noticed */
149 /** @brief The user database
150 * - Keys are usernames
151 * - Values are encoded key-value pairs
152 * - Data is user data and cannot be reconstructed
156 static pid_t db_deadlock_pid = -1; /* deadlock manager PID */
157 static pid_t rescan_pid = -1; /* rescanner PID */
158 static int initialized, opened; /* state */
160 /* tracks matched by required_tags */
161 static char **reqtracks;
162 static size_t nreqtracks;
164 /* comparison function for keys */
165 static int compare(DB attribute((unused)) *db_,
166 const DBT *a, const DBT *b) {
167 return compare_path_raw(a->data, a->size, b->data, b->size);
170 /** @brief Open database environment
171 * @param flags Flags word
173 * Flags should be one of:
174 * - @ref TRACKDB_NO_RECOVER
175 * - @ref TRACKDB_NORMAL_RECOVER
176 * - @ref TRACKDB_FATAL_RECOVER
177 * - @ref TRACKDB_MAY_CREATE
179 void trackdb_init(int flags) {
181 const int recover = flags & TRACKDB_RECOVER_MASK;
182 static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL };
185 assert(initialized == 0);
188 if(strcmp(home, config->home))
189 fatal(0, "cannot change db home without server restart");
193 if(flags & TRACKDB_MAY_CREATE) {
199 /* Remove world/group permissions on any regular files already in the
200 * database directory. Actually we don't care about all of them but it's
201 * easier to just do the lot. This can be revisited if it's a serious
202 * practical inconvenience for anyone.
204 * The socket, not being a regular file, is excepted.
206 if(!(dp = opendir(config->home)))
207 fatal(errno, "error reading %s", config->home);
208 while((de = readdir(dp))) {
209 byte_xasprintf(&p, "%s/%s", config->home, de->d_name);
210 if(lstat(p, &st) == 0
211 && S_ISREG(st.st_mode)
212 && (st.st_mode & 077)) {
213 if(chmod(p, st.st_mode & 07700) < 0)
214 fatal(errno, "cannot chmod %s", p);
221 /* create environment */
222 if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s",
224 if((err = trackdb_env->set_alloc(trackdb_env,
225 xmalloc_noptr, xrealloc_noptr, xfree)))
226 fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err));
227 if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000)))
228 fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err));
229 if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000)))
230 fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err));
231 if((err = trackdb_env->open(trackdb_env, config->home,
237 |recover_type[recover],
239 fatal(0, "trackdb_env->open %s: %s", config->home, db_strerror(err));
240 trackdb_env->set_errpfx(trackdb_env, "DB");
241 trackdb_env->set_errfile(trackdb_env, stderr);
242 trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1);
243 trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1);
244 trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1);
245 D(("initialized database environment"));
248 /* called when deadlock manager terminates */
249 static int reap_db_deadlock(ev_source attribute((unused)) *ev,
250 pid_t attribute((unused)) pid,
252 const struct rusage attribute((unused)) *rusage,
253 void attribute((unused)) *u) {
254 db_deadlock_pid = -1;
256 fatal(0, "deadlock manager unexpectedly terminated: %s",
259 D(("deadlock manager terminated: %s", wstat(status)));
263 static pid_t subprogram(ev_source *ev, const char *prog,
267 /* If we're in the background then trap subprocess stdout/stderr */
268 if(!(pid = xfork())) {
271 ev_signal_atfork(ev);
272 signal(SIGPIPE, SIG_DFL);
277 /* ensure we don't leak privilege anywhere */
278 if(setuid(geteuid()) < 0)
279 fatal(errno, "error calling setuid");
280 /* If we were negatively niced, undo it. We don't bother checking for
281 * error, it's not that important. */
282 setpriority(PRIO_PROCESS, 0, 0);
283 execlp(prog, prog, "--config", configfile,
284 debugging ? "--debug" : "--no-debug",
285 log_default == &log_syslog ? "--syslog" : "--no-syslog",
287 fatal(errno, "error invoking %s", prog);
292 /* start deadlock manager */
293 void trackdb_master(ev_source *ev) {
294 assert(db_deadlock_pid == -1);
295 db_deadlock_pid = subprogram(ev, DEADLOCK, -1);
296 ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0);
297 D(("started deadlock manager"));
300 /* close environment */
301 void trackdb_deinit(void) {
305 assert(initialized == 1);
308 /* close the environment */
309 if((err = trackdb_env->close(trackdb_env, 0)))
310 fatal(0, "trackdb_env->close: %s", db_strerror(err));
312 if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0)
313 fatal(errno, "error killing rescanner");
315 /* terminate the deadlock manager */
316 if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0)
317 fatal(errno, "error killing deadlock manager");
318 db_deadlock_pid = -1;
320 D(("deinitialized database environment"));
323 /* open a specific database */
324 static DB *open_db(const char *path,
332 D(("open %s", path));
333 path = config_get_file(path);
334 if((err = db_create(&db, trackdb_env, 0)))
335 fatal(0, "db_create %s: %s", path, db_strerror(err));
337 if((err = db->set_flags(db, dbflags)))
338 fatal(0, "db->set_flags %s: %s", path, db_strerror(err));
339 if(dbtype == DB_BTREE)
340 if((err = db->set_bt_compare(db, compare)))
341 fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err));
342 if((err = db->open(db, 0, path, 0, dbtype,
343 openflags | DB_AUTO_COMMIT, mode))) {
344 if((openflags & DB_CREATE) || errno != ENOENT)
345 fatal(0, "db->open %s: %s", path, db_strerror(err));
352 /** @brief Open track databases
353 * @param Flags flags word
355 * @p flags should have one of:
356 * - @p TRACKDB_NO_UPGRADE, if no upgrade should be attempted
357 * - @p TRACKDB_CAN_UPGRADE, if an upgrade may be attempted
358 * - @p TRACKDB_OPEN_FOR_UPGRADE, if this is disorder-dbupgrade
360 * - @p TRACKDB_READ_ONLY, read only access
362 void trackdb_open(int flags) {
365 uint32_t dbflags = flags & TRACKDB_READ_ONLY ? DB_RDONLY : DB_CREATE;
370 /* check the database version first */
371 trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_RDONLY, 0666);
372 if(trackdb_globaldb) {
373 /* This is an existing database */
377 s = trackdb_get_global("_dbversion");
378 /* Close the database again, we'll open it property below */
379 if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
380 fatal(0, "error closing global.db: %s", db_strerror(err));
381 trackdb_globaldb = 0;
382 /* Convert version string to an integer */
383 oldversion = s ? atol(s) : 1;
384 if(oldversion > config->dbversion) {
385 /* Database is from the future; we never allow this. */
386 fatal(0, "this version of DisOrder is too old for database version %ld",
389 if(oldversion < config->dbversion) {
390 /* Database version is out of date */
391 switch(flags & TRACKDB_UPGRADE_MASK) {
392 case TRACKDB_NO_UPGRADE:
393 /* This database needs upgrading but this is not permitted */
394 fatal(0, "database needs upgrading from %ld to %ld",
395 oldversion, config->dbversion);
396 case TRACKDB_CAN_UPGRADE:
397 /* This database needs upgrading */
398 info("invoking disorder-dbupgrade to upgrade from %ld to %ld",
399 oldversion, config->dbversion);
400 pid = subprogram(0, "disorder-dbupgrade", -1);
401 while(waitpid(pid, &err, 0) == -1 && errno == EINTR)
404 fatal(0, "disorder-dbupgrade %s", wstat(err));
405 info("disorder-dbupgrade succeeded");
407 case TRACKDB_OPEN_FOR_UPGRADE:
413 if(oldversion == config->dbversion && (flags & TRACKDB_OPEN_FOR_UPGRADE)) {
414 /* This doesn't make any sense */
415 fatal(0, "database is already at current version");
417 trackdb_existing_database = 1;
419 if(flags & TRACKDB_OPEN_FOR_UPGRADE) {
420 /* Cannot upgrade a new database */
421 fatal(0, "cannot upgrade a database that does not exist");
423 /* This is a brand new database */
424 trackdb_existing_database = 0;
426 /* open the databases */
427 trackdb_tracksdb = open_db("tracks.db",
428 DB_RECNUM, DB_BTREE, dbflags, 0666);
429 trackdb_searchdb = open_db("search.db",
430 DB_DUP|DB_DUPSORT, DB_HASH, dbflags, 0666);
431 trackdb_tagsdb = open_db("tags.db",
432 DB_DUP|DB_DUPSORT, DB_HASH, dbflags, 0666);
433 trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, dbflags, 0666);
434 trackdb_globaldb = open_db("global.db", 0, DB_HASH, dbflags, 0666);
435 trackdb_noticeddb = open_db("noticed.db",
436 DB_DUPSORT, DB_BTREE, dbflags, 0666);
437 trackdb_usersdb = open_db("users.db",
438 0, DB_HASH, dbflags, 0600);
439 if(!trackdb_existing_database) {
440 /* Stash the database version */
443 assert(!(flags & TRACKDB_OPEN_FOR_UPGRADE));
444 snprintf(buf, sizeof buf, "%ld", config->dbversion);
445 trackdb_set_global("_dbversion", buf, 0);
447 D(("opened databases"));
450 /* close track databases */
451 void trackdb_close(void) {
457 if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0)))
458 fatal(0, "error closing tracks.db: %s", db_strerror(err));
459 if((err = trackdb_searchdb->close(trackdb_searchdb, 0)))
460 fatal(0, "error closing search.db: %s", db_strerror(err));
461 if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0)))
462 fatal(0, "error closing tags.db: %s", db_strerror(err));
463 if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0)))
464 fatal(0, "error closing prefs.db: %s", db_strerror(err));
465 if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
466 fatal(0, "error closing global.db: %s", db_strerror(err));
467 if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0)))
468 fatal(0, "error closing noticed.db: %s", db_strerror(err));
469 if((err = trackdb_usersdb->close(trackdb_usersdb, 0)))
470 fatal(0, "error closing users.db: %s", db_strerror(err));
471 trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0;
472 trackdb_tagsdb = trackdb_globaldb = 0;
473 D(("closed databases"));
476 /* generic db routines *******************************************************/
478 /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or
479 * DB_LOCK_DEADLOCK. */
480 int trackdb_getdata(DB *db,
487 switch(err = db->get(db, tid, make_key(&key, track),
488 prepare_data(&data), 0)) {
490 *kp = kvp_urldecode(data.data, data.size);
495 case DB_LOCK_DEADLOCK:
496 error(0, "error querying database: %s", db_strerror(err));
499 fatal(0, "error querying database: %s", db_strerror(err));
503 /* encode and store a database entry. Returns 0, DB_KEYEXIST or
504 * DB_LOCK_DEADLOCK. */
505 int trackdb_putdata(DB *db,
513 switch(err = db->put(db, tid, make_key(&key, track),
514 encode_data(&data, k), flags)) {
518 case DB_LOCK_DEADLOCK:
519 error(0, "error updating database: %s", db_strerror(err));
522 fatal(0, "error updating database: %s", db_strerror(err));
526 /** @brief Delete a database entry
528 * @param track Key to delete
529 * @param tid Transaction ID
530 * @return 0, DB_NOTFOUND or DB_LOCK_DEADLOCK
532 int trackdb_delkey(DB *db,
538 switch(err = db->del(db, tid, make_key(&key, track), 0)) {
542 case DB_LOCK_DEADLOCK:
543 error(0, "error updating database: %s", db_strerror(err));
546 fatal(0, "error updating database: %s", db_strerror(err));
550 /* open a database cursor */
551 DBC *trackdb_opencursor(DB *db, DB_TXN *tid) {
555 switch(err = db->cursor(db, tid, &c, 0)) {
557 default: fatal(0, "error creating cursor: %s", db_strerror(err));
562 /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */
563 int trackdb_closecursor(DBC *c) {
567 switch(err = c->c_close(c)) {
570 case DB_LOCK_DEADLOCK:
571 error(0, "error closing cursor: %s", db_strerror(err));
574 fatal(0, "error closing cursor: %s", db_strerror(err));
578 /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
579 int trackdb_delkeydata(DB *db,
587 c = trackdb_opencursor(db, tid);
588 switch(err = c->c_get(c, make_key(&key, word),
589 make_key(&data, track), DB_GET_BOTH)) {
591 switch(err = c->c_del(c, 0)) {
597 case DB_LOCK_DEADLOCK:
598 error(0, "error updating database: %s", db_strerror(err));
601 fatal(0, "c->c_del: %s", db_strerror(err));
606 case DB_LOCK_DEADLOCK:
607 error(0, "error updating database: %s", db_strerror(err));
610 fatal(0, "c->c_get: %s", db_strerror(err));
612 if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK;
616 /* start a transaction */
617 DB_TXN *trackdb_begin_transaction(void) {
621 if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0)))
622 fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err));
626 /* abort transaction */
627 void trackdb_abort_transaction(DB_TXN *tid) {
631 if((err = tid->abort(tid)))
632 fatal(0, "tid->abort: %s", db_strerror(err));
635 /* commit transaction */
636 void trackdb_commit_transaction(DB_TXN *tid) {
639 if((err = tid->commit(tid, 0)))
640 fatal(0, "tid->commit: %s", db_strerror(err));
643 /* search/tags shared code ***************************************************/
645 /* comparison function used by dedupe() */
646 static int wordcmp(const void *a, const void *b) {
647 return strcmp(*(const char **)a, *(const char **)b);
650 /* sort and de-dupe VEC */
651 static char **dedupe(char **vec, int nvec) {
654 qsort(vec, nvec, sizeof (char *), wordcmp);
658 for(n = 1; n < nvec; ++n)
659 if(strcmp(vec[n], vec[m - 1]))
666 /* update a key/track database. Returns 0 or DB_DEADLOCK. */
667 static int register_word(DB *db, const char *what,
668 const char *track, const char *word,
673 switch(err = db->put(db, tid, make_key(&key, word),
674 make_key(&data, track), DB_NODUPDATA)) {
678 case DB_LOCK_DEADLOCK:
679 error(0, "error updating %s.db: %s", what, db_strerror(err));
682 fatal(0, "error updating %s.db: %s", what, db_strerror(err));
686 /* search primitives *********************************************************/
688 /* return true iff NAME is a trackname_display_ pref */
689 static int is_display_pref(const char *name) {
690 static const char prefix[] = "trackname_display_";
691 return !strncmp(name, prefix, (sizeof prefix) - 1);
694 /** @brief Word_Break property tailor that treats underscores as spaces */
695 static int tailor_underscore_Word_Break_Other(uint32_t c) {
699 case 0x005F: /* LOW LINE (SPACING UNDERSCORE) */
700 return unicode_Word_Break_Other;
704 /** @brief Remove all combining characters in-place
705 * @param s Pointer to start of string
706 * @param ns Length of string
707 * @return New, possiblby reduced, length
709 static size_t remove_combining_chars(uint32_t *s, size_t ns) {
710 uint32_t *start = s, *t = s, *end = s + ns;
713 const uint32_t c = *s++;
714 if(!utf32_combining_class(c))
720 /** @brief Normalize and split a string using a given tailoring */
721 static void word_split(struct vector *v,
723 unicode_property_tailor *pt) {
725 uint32_t *t32, **w32;
727 /* Convert to UTF-32 */
728 if(!(t32 = utf8_to_utf32(s, strlen(s), &nt32)))
730 /* Erase case distinctions */
731 if(!(t32 = utf32_casefold_compat(t32, nt32, &nt32)))
733 /* Drop combining characters */
734 nt32 = remove_combining_chars(t32, nt32);
735 /* Split into words, treating _ as a space */
736 w32 = utf32_word_split(t32, nt32, &nw, pt);
737 /* Convert words back to UTF-8 and append to result */
738 for(i = 0; i < nw; ++i)
739 vector_append(v, utf32_to_utf8(w32[i], utf32_len(w32[i]), 0));
742 /** @brief Normalize a tag
744 * @param ns Length of tag
745 * @return Normalized string or NULL on error
747 * The return value will be:
749 * - have no leading or trailing space
750 * - have no combining characters
751 * - all spacing between words will be a single U+0020 SPACE
753 static char *normalize_tag(const char *s, size_t ns) {
754 uint32_t *s32, **w32;
755 size_t ns32, nw32, i;
758 if(!(s32 = utf8_to_utf32(s, ns, &ns32)))
760 if(!(s32 = utf32_casefold_compat(s32, ns32, &ns32))) /* ->NFKD */
762 ns32 = remove_combining_chars(s32, ns32);
763 /* Split into words, no Word_Break tailoring */
764 w32 = utf32_word_split(s32, ns32, &nw32, 0);
765 /* Compose back into a string */
767 for(i = 0; i < nw32; ++i) {
769 dynstr_append(d, ' ');
770 dynstr_append_string(d, utf32_to_utf8(w32[i], utf32_len(w32[i]), 0));
776 /* compute the words of a track name */
777 static char **track_to_words(const char *track,
778 const struct kvp *p) {
780 const char *rootless = track_rootless(track);
783 rootless = track; /* bodge */
785 rootless = strip_extension(rootless);
786 word_split(&v, strip_extension(rootless), tailor_underscore_Word_Break_Other);
787 for(; p; p = p->next)
788 if(is_display_pref(p->name))
789 word_split(&v, p->value, 0);
790 vector_terminate(&v);
791 return dedupe(v.vec, v.nvec);
794 /* return nonzero iff WORD is a stopword */
795 static int stopword(const char *word) {
798 for(n = 0; n < config->stopword.n
799 && strcmp(word, config->stopword.s[n]); ++n)
801 return n < config->stopword.n;
804 /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */
805 static int register_search_word(const char *track, const char *word,
807 if(stopword(word)) return 0;
808 return register_word(trackdb_searchdb, "search", track, word, tid);
811 /* Tags **********************************************************************/
813 /* Return nonzero if C is a valid tag character */
814 static int tagchar(int c) {
823 /* Parse and de-dupe a tag list. If S=0 then assumes "". */
824 static char **parsetags(const char *s) {
830 /* skip initial separators */
831 while(*s && (!tagchar(*s) || *s == ' '))
834 /* find the extent of the tag */
836 while(*s && tagchar(*s))
838 /* strip trailing spaces */
839 while(s > t && s[-1] == ' ')
841 /* add tag to list */
842 vector_append(&v, normalize_tag(t, (size_t)(s - t)));
843 /* skip intermediate and trailing separators */
844 while(*s && (!tagchar(*s) || *s == ' '))
848 vector_terminate(&v);
849 return dedupe(v.vec, v.nvec);
852 /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */
853 static int register_tag(const char *track, const char *tag, DB_TXN *tid) {
854 return register_word(trackdb_tagsdb, "tags", track, tag, tid);
857 /* aliases *******************************************************************/
859 /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If
860 * there is no alias sets *aliasp to 0. */
861 static int compute_alias(char **aliasp,
866 const char *s = config->alias, *t, *expansion, *part;
867 int c, used_db = 0, slash_prefix, err;
869 const char *const root = find_track_root(track);
872 /* Bodge for tracks with no root */
877 dynstr_append_string(&d, root);
878 while((c = (unsigned char)*s++)) {
880 dynstr_append(&d, c);
883 if((slash_prefix = (*s == '/')))
886 assert(t != 0); /* validated at startup */
887 part = xstrndup(s, t - s);
888 expansion = getpart(track, "display", part, p, &used_db);
890 if(slash_prefix) dynstr_append(&d, '/');
891 dynstr_append_string(&d, expansion);
893 s = t + 1; /* skip {part} */
895 /* only admit to the alias if we used the db... */
900 dynstr_terminate(&d);
901 /* ...and the answer differs from the original... */
902 if(!strcmp(track, d.vec)) {
906 /* ...and there isn't already a different track with that name (including as
908 switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) {
910 if((s = kvp_get(at, "_alias_for"))
911 && !strcmp(s, track)) {
923 /* get track and prefs data (if tp/pp not null pointers). Returns 0 on
924 * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK.
925 * Always sets the return values, even if only to null pointers. */
926 static int gettrackdata(const char *track,
929 const char **actualp,
931 #define GTD_NOALIAS 0x0001
934 const char *actual = track;
935 struct kvp *t = 0, *p = 0;
937 if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done;
938 if((actual = kvp_get(t, "_alias_for"))) {
939 if(flags & GTD_NOALIAS) {
940 error(0, "alias passed to gettrackdata where real path required");
943 if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done;
948 if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK)
953 if(actualp) *actualp = actual;
959 /* trackdb_notice() **********************************************************/
961 /** @brief notice a possibly new track
962 * @return @c DB_NOTFOUND if new, 0 if already known
964 int trackdb_notice(const char *track,
970 tid = trackdb_begin_transaction();
971 err = trackdb_notice_tid(track, path, tid);
972 if((err == DB_LOCK_DEADLOCK)) goto fail;
975 trackdb_abort_transaction(tid);
977 trackdb_commit_transaction(tid);
981 /** @brief notice a possibly new track
982 * @param track NFC UTF-8 track name
983 * @param path Raw path name
984 * @param tid Transaction ID
985 * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also
987 int trackdb_notice_tid(const char *track,
991 struct kvp *t, *a, *p;
995 /* notice whether the tracks.db entry changes */
997 /* get any existing tracks entry */
998 if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK)
1000 ret = err; /* 0 or DB_NOTFOUND */
1001 /* this is a real track */
1002 t_changed += kvp_set(&t, "_alias_for", 0);
1003 t_changed += kvp_set(&t, "_path", path);
1004 /* if we have an alias record it in the database */
1005 if((err = compute_alias(&alias, track, p, tid))) return err;
1007 /* won't overwrite someone else's alias as compute_alias() checks */
1008 D(("%s: alias %s", track, alias));
1010 kvp_set(&a, "_alias_for", track);
1011 if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err;
1013 /* update search.db */
1014 w = track_to_words(track, p);
1015 for(n = 0; w[n]; ++n)
1016 if((err = register_search_word(track, w[n], tid)))
1018 /* update tags.db */
1019 w = parsetags(kvp_get(p, "tags"));
1020 for(n = 0; w[n]; ++n)
1021 if((err = register_tag(track, w[n], tid)))
1024 /* only store the tracks.db entry if it has changed */
1025 if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)))
1027 if(ret == DB_NOTFOUND) {
1028 uint32_t timestamp[2];
1033 timestamp[0] = htonl((uint64_t)now >> 32);
1034 timestamp[1] = htonl((uint32_t)now);
1035 memset(&key, 0, sizeof key);
1036 key.data = timestamp;
1037 key.size = sizeof timestamp;
1038 switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key,
1039 make_key(&data, track), 0)) {
1041 case DB_LOCK_DEADLOCK: return err;
1042 default: fatal(0, "error updating noticed.db: %s", db_strerror(err));
1048 /* trackdb_obsolete() ********************************************************/
1050 /* obsolete a track */
1051 int trackdb_obsolete(const char *track, DB_TXN *tid) {
1056 if((err = gettrackdata(track, 0, &p, 0,
1057 GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK)
1059 else if(err == DB_NOTFOUND) return 0;
1060 /* compute the alias, if any, and delete it */
1061 if((err = compute_alias(&alias, track, p, tid))) return err;
1063 /* if the alias points to some other track then compute_alias won't
1065 if((err = trackdb_delkey(trackdb_tracksdb, alias, tid))
1066 && err != DB_NOTFOUND)
1069 /* update search.db */
1070 w = track_to_words(track, p);
1071 for(n = 0; w[n]; ++n)
1072 if(trackdb_delkeydata(trackdb_searchdb,
1073 w[n], track, tid) == DB_LOCK_DEADLOCK)
1075 /* update tags.db */
1076 w = parsetags(kvp_get(p, "tags"));
1077 for(n = 0; w[n]; ++n)
1078 if(trackdb_delkeydata(trackdb_tagsdb,
1079 w[n], track, tid) == DB_LOCK_DEADLOCK)
1082 /* update tracks.db */
1083 if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK)
1085 /* We don't delete the prefs, so they survive temporary outages of the
1086 * (possibly virtual) track filesystem */
1090 /* trackdb_stats() ***********************************************************/
1092 #define H(name) { #name, offsetof(DB_HASH_STAT, name) }
1093 #define B(name) { #name, offsetof(DB_BTREE_STAT, name) }
1095 static const struct statinfo {
1098 } statinfo_hash[] = {
1114 }, statinfo_btree[] = {
1135 /* look up stats for DB */
1136 static int get_stats(struct vector *v,
1138 const struct statinfo *si,
1147 switch(err = database->stat(database, tid, &sp, 0)) {
1150 case DB_LOCK_DEADLOCK:
1151 error(0, "error querying database: %s", db_strerror(err));
1154 fatal(0, "error querying database: %s", db_strerror(err));
1156 for(n = 0; n < nsi; ++n) {
1157 byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name,
1158 (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset));
1159 vector_append(v, str);
1165 /** @brief One entry in the search league */
1166 struct search_entry {
1171 /** @brief Add a word to the search league
1172 * @param se Pointer to search league
1173 * @param count Maximum size for search league
1174 * @param nse Current size of search league
1175 * @param word New word, or NULL
1176 * @param n How often @p word appears
1177 * @return New size of search league
1179 static int register_search_entry(struct search_entry *se,
1186 if(word && (nse < count || n > se[nse - 1].n)) {
1187 /* Find the starting point */
1192 /* Find the insertion point */
1193 while(i > 0 && n > se[i - 1].n)
1195 memmove(&se[i + 1], &se[i], (nse - i - 1) * sizeof *se);
1202 /* find the top COUNT words in the search database */
1203 static int search_league(struct vector *v, int count, DB_TXN *tid) {
1204 struct search_entry *se;
1207 int err, n = 0, nse = 0, i;
1212 cursor = trackdb_opencursor(trackdb_searchdb, tid);
1213 se = xmalloc(count * sizeof *se);
1214 /* Walk across the whole database counting up the number of times each
1216 while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
1218 if(word && wl == k.size && !strncmp(word, k.data, wl))
1219 ++n; /* same word again */
1221 nse = register_search_entry(se, count, nse, word, n);
1222 word = xstrndup(k.data, wl = k.size);
1230 case DB_LOCK_DEADLOCK:
1231 error(0, "error querying search database: %s", db_strerror(err));
1234 fatal(0, "error querying search database: %s", db_strerror(err));
1236 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1238 nse = register_search_entry(se, count, nse, word, n);
1239 byte_xasprintf(&str, "Top %d search words:", nse);
1240 vector_append(v, str);
1241 for(i = 0; i < nse; ++i) {
1242 byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word);
1243 vector_append(v, str);
1248 #define SI(what) statinfo_##what, \
1249 sizeof statinfo_##what / sizeof (struct statinfo)
1251 /* return a list of database stats */
1252 char **trackdb_stats(int *nstatsp) {
1258 tid = trackdb_begin_transaction();
1260 vector_append(&v, (char *)"Tracks database stats:");
1261 if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail;
1262 vector_append(&v, (char *)"");
1263 vector_append(&v, (char *)"Search database stats:");
1264 if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail;
1265 vector_append(&v, (char *)"");
1266 vector_append(&v, (char *)"Prefs database stats:");
1267 if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail;
1268 vector_append(&v, (char *)"");
1269 if(search_league(&v, 10, tid)) goto fail;
1270 vector_terminate(&v);
1273 trackdb_abort_transaction(tid);
1275 trackdb_commit_transaction(tid);
1276 if(nstatsp) *nstatsp = v.nvec;
1280 struct stats_details {
1281 void (*done)(char *data, void *u);
1283 int exited; /* subprocess exited */
1284 int closed; /* pipe close */
1285 int wstat; /* wait status from subprocess */
1286 struct dynstr data[1]; /* data read from pipe */
1289 static void stats_complete(struct stats_details *d) {
1292 if(!(d->exited && d->closed))
1294 byte_xasprintf(&s, "\n"
1296 "track lookup cache hits: %lu\n"
1297 "track lookup cache misses: %lu\n",
1299 cache_files_misses);
1300 dynstr_append_string(d->data, s);
1301 dynstr_terminate(d->data);
1302 d->done(d->data->vec, d->u);
1305 static int stats_finished(ev_source attribute((unused)) *ev,
1306 pid_t attribute((unused)) pid,
1308 const struct rusage attribute((unused)) *rusage,
1310 struct stats_details *const d = u;
1314 error(0, "disorder-stats %s", wstat(status));
1319 static int stats_read(ev_source attribute((unused)) *ev,
1325 struct stats_details *const d = u;
1327 dynstr_append_bytes(d->data, ptr, bytes);
1328 ev_reader_consume(reader, bytes);
1335 static int stats_error(ev_source attribute((unused)) *ev,
1338 struct stats_details *const d = u;
1340 error(errno_value, "error reading from pipe to disorder-stats");
1346 void trackdb_stats_subprocess(ev_source *ev,
1347 void (*done)(char *data, void *u),
1351 struct stats_details *d = xmalloc(sizeof *d);
1353 dynstr_init(d->data);
1357 pid = subprogram(ev, "disorder-stats", p[1]);
1359 ev_child(ev, pid, 0, stats_finished, d);
1360 ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader");
1363 /* set a pref (remove if value=0) */
1364 int trackdb_set(const char *track,
1366 const char *value) {
1367 struct kvp *t, *p, *a;
1370 char *oldalias, *newalias, **oldtags = 0, **newtags;
1373 /* TODO: if value matches default then set value=0 */
1377 tid = trackdb_begin_transaction();
1378 if((err = gettrackdata(track, &t, &p, 0,
1379 0, tid)) == DB_LOCK_DEADLOCK)
1381 if(err == DB_NOTFOUND) break;
1382 if(name[0] == '_') {
1383 if(kvp_set(&t, name, value))
1384 if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))
1387 /* get the old alias name */
1388 if(compute_alias(&oldalias, track, p, tid)) goto fail;
1389 /* get the old tags */
1390 if(!strcmp(name, "tags"))
1391 oldtags = parsetags(kvp_get(p, "tags"));
1393 if(kvp_set(&p, name, value))
1394 if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0))
1396 /* compute the new alias name */
1397 if((err = compute_alias(&newalias, track, p, tid))) goto fail;
1398 /* check whether alias has changed */
1399 if(!(oldalias == newalias
1400 || (oldalias && newalias && !strcmp(oldalias, newalias)))) {
1401 /* adjust alias records to fit change */
1403 && trackdb_delkey(trackdb_tracksdb, oldalias, tid) == DB_LOCK_DEADLOCK)
1407 kvp_set(&a, "_alias_for", track);
1408 if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail;
1411 /* check whether tags have changed */
1412 if(!strcmp(name, "tags")) {
1413 newtags = parsetags(value);
1414 while(*oldtags || *newtags) {
1415 if(*oldtags && *newtags) {
1416 cmp = strcmp(*oldtags, *newtags);
1418 /* keeping this tag */
1422 /* old tag fits into a gap in the new list, so delete old */
1425 /* new tag fits into a gap in the old list, so insert new */
1427 } else if(*oldtags) {
1428 /* we've run out of new tags, so remaining old ones are to be
1431 if(trackdb_delkeydata(trackdb_tagsdb,
1432 *oldtags, track, tid) == DB_LOCK_DEADLOCK)
1436 /* we've run out of old tags, so remainig new ones are to be
1439 if(register_tag(track, *newtags, tid)) goto fail;
1449 trackdb_abort_transaction(tid);
1451 trackdb_commit_transaction(tid);
1452 return err == 0 ? 0 : -1;
1456 const char *trackdb_get(const char *track,
1458 return kvp_get(trackdb_get_all(track), name);
1461 /* get all prefs as a 0-terminated array */
1462 struct kvp *trackdb_get_all(const char *track) {
1463 struct kvp *t, *p, **pp;
1467 tid = trackdb_begin_transaction();
1468 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1472 trackdb_abort_transaction(tid);
1474 trackdb_commit_transaction(tid);
1475 for(pp = &p; *pp; pp = &(*pp)->next)
1482 const char *trackdb_resolve(const char *track) {
1487 tid = trackdb_begin_transaction();
1488 if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK)
1492 trackdb_abort_transaction(tid);
1494 trackdb_commit_transaction(tid);
1498 int trackdb_isalias(const char *track) {
1499 const char *actual = trackdb_resolve(track);
1501 return strcmp(actual, track);
1504 /* test whether a track exists (perhaps an alias) */
1505 int trackdb_exists(const char *track) {
1510 tid = trackdb_begin_transaction();
1511 /* unusually, here we want the return value */
1512 if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK)
1516 trackdb_abort_transaction(tid);
1518 trackdb_commit_transaction(tid);
1522 /* return the list of tags */
1523 char **trackdb_alltags(void) {
1529 tid = trackdb_begin_transaction();
1530 err = trackdb_alltags_tid(tid, &taglist);
1532 trackdb_abort_transaction(tid);
1534 trackdb_commit_transaction(tid);
1538 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) {
1545 c = trackdb_opencursor(trackdb_tagsdb, tid);
1546 memset(&k, 0, sizeof k);
1547 while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP)))
1548 vector_append(&v, xstrndup(k.data, k.size));
1552 case DB_LOCK_DEADLOCK:
1555 fatal(0, "c->c_get: %s", db_strerror(err));
1557 if((err = trackdb_closecursor(c))) return err;
1558 vector_terminate(&v);
1563 /* return 1 iff sorted tag lists A and B have at least one member in common */
1564 static int tag_intersection(char **a, char **b) {
1567 /* Same sort of logic as trackdb_set() above */
1569 if(!(cmp = strcmp(*a, *b))) return 1;
1570 else if(cmp < 0) ++a;
1576 /* Check whether a track is suitable for random play. Returns 0 if it is,
1577 * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us
1579 static int check_suitable(const char *track,
1581 char **required_tags,
1582 char **prohibited_tags) {
1586 const char *pick_at_random, *played_time;
1588 /* don't pick tracks that aren't in any surviving collection (for instance
1589 * you've edited the config but the rescan hasn't done its job yet) */
1590 if(!find_track_root(track)) {
1591 info("found track not in any collection: %s", track);
1594 /* don't pick aliases - only pick the canonical form */
1595 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1596 return DB_LOCK_DEADLOCK;
1597 if(kvp_get(t, "_alias_for"))
1599 /* check that random play is not suppressed for this track */
1600 if((pick_at_random = kvp_get(p, "pick_at_random"))
1601 && !strcmp(pick_at_random, "0"))
1603 /* don't pick a track that's been played in the last 8 hours */
1604 if((played_time = kvp_get(p, "played_time"))) {
1605 last = atoll(played_time);
1607 if(now < last + 8 * 3600) /* TODO configurable */
1610 track_tags = parsetags(kvp_get(p, "tags"));
1611 /* check that no prohibited tag is present for this track */
1612 if(prohibited_tags && tag_intersection(track_tags, prohibited_tags))
1614 /* check that at least one required tags is present for this track */
1615 if(*required_tags && !tag_intersection(track_tags, required_tags))
1620 /* attempt to pick a random non-alias track */
1621 const char *trackdb_random(int tries) {
1626 const char *track, *candidate;
1629 char **required_tags, **prohibited_tags, **tp;
1634 tid = trackdb_begin_transaction();
1635 if((err = trackdb_get_global_tid("required-tags", tid, &tags)))
1637 required_tags = parsetags(tags);
1638 if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags)))
1640 prohibited_tags = parsetags(tags);
1642 if(*required_tags) {
1643 /* Bung all the suitable tracks into a hash and convert to a list of keys
1644 * (to eliminate duplicates). We cache this list since it is possible
1645 * that it will be very large. */
1648 for(tp = required_tags; *tp; ++tp) {
1649 c = trackdb_opencursor(trackdb_tagsdb, tid);
1650 memset(&key, 0, sizeof key);
1652 key.size = strlen(*tp);
1654 err = c->c_get(c, &key, prepare_data(&data), DB_SET);
1656 hash_add(h, xstrndup(data.data, data.size), 0,
1657 HASH_INSERT_OR_REPLACE);
1659 err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP);
1665 case DB_LOCK_DEADLOCK:
1668 fatal(0, "error querying tags.db: %s", db_strerror(err));
1670 trackdb_closecursor(c);
1673 error(0, "required tag %s does not match any tracks", *tp);
1675 nreqtracks = hash_count(h);
1676 reqtracks = hash_keys(h);
1678 while(nreqtracks && !track && tries-- > 0) {
1679 r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0));
1680 candidate = reqtracks[r];
1681 switch(check_suitable(candidate, tid,
1682 required_tags, prohibited_tags)) {
1688 case DB_LOCK_DEADLOCK:
1693 /* No required tags. We pick random record numbers in the database
1695 switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) {
1698 case DB_LOCK_DEADLOCK:
1699 error(0, "error querying tracks.db: %s", db_strerror(err));
1702 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1705 error(0, "cannot pick tracks at random from an empty database");
1706 while(sp->bt_nkeys && !track && tries-- > 0) {
1707 /* record numbers count from 1 upwards */
1708 r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0));
1709 memset(&key, sizeof key, 0);
1710 key.flags = DB_DBT_MALLOC;
1711 key.size = sizeof r;
1713 switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data),
1717 case DB_LOCK_DEADLOCK:
1718 error(0, "error querying tracks.db: %s", db_strerror(err));
1721 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1723 candidate = xstrndup(key.data, key.size);
1724 switch(check_suitable(candidate, tid,
1725 required_tags, prohibited_tags)) {
1731 case DB_LOCK_DEADLOCK:
1738 trackdb_closecursor(c);
1740 trackdb_abort_transaction(tid);
1742 trackdb_commit_transaction(tid);
1744 error(0, "could not pick a random track");
1748 /* get a track name given the prefs. Set *used_db to 1 if we got the answer
1749 * from the prefs. */
1750 static const char *getpart(const char *track,
1751 const char *context,
1753 const struct kvp *p,
1758 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1759 if((result = kvp_get(p, pref)))
1762 result = trackname_part(track, context, part);
1763 assert(result != 0);
1767 /* get a track name part, like trackname_part(), but taking the database into
1769 const char *trackdb_getpart(const char *track,
1770 const char *context,
1778 /* construct the full pref */
1779 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1781 tid = trackdb_begin_transaction();
1782 if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK)
1786 trackdb_abort_transaction(tid);
1788 trackdb_commit_transaction(tid);
1789 return getpart(actual, context, part, p, &used_db);
1792 /* get the raw path name for @track@ (might be an alias) */
1793 const char *trackdb_rawpath(const char *track) {
1799 tid = trackdb_begin_transaction();
1800 if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK)
1804 trackdb_abort_transaction(tid);
1806 trackdb_commit_transaction(tid);
1807 if(!(path = kvp_get(t, "_path"))) path = track;
1811 /* trackdb_list **************************************************************/
1813 /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually
1814 * readable at some point */
1816 /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE.
1817 * If RE is a null pointer then it matches everything. */
1818 static int track_matches(size_t dl, const char *track, size_t tl,
1826 switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) {
1827 case PCRE_ERROR_NOMATCH: return 0;
1830 error(0, "pcre_exec returned %d, subject '%s'", rc, track);
1837 static int do_list(struct vector *v, const char *dir,
1838 enum trackdb_listable what, const pcre *re, DB_TXN *tid) {
1844 size_t l, last_dir_len = 0;
1845 char *last_dir = 0, *track, *alias;
1849 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1852 /* find the first key >= dir */
1853 err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE);
1854 /* keep going while we're dealing with <dir/anything> */
1857 && ((char *)k.data)[dl] == '/'
1858 && !memcmp(k.data, dir, dl)) {
1859 ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1));
1861 /* we have <dir/component/anything>, so <dir/component> is a directory */
1862 l = ptr - (char *)k.data;
1863 if(what & trackdb_directories)
1865 && l == last_dir_len
1866 && !memcmp(last_dir, k.data, l))) {
1867 last_dir = xstrndup(k.data, last_dir_len = l);
1868 if(track_matches(dl, k.data, l, re))
1869 vector_append(v, last_dir);
1872 /* found a plain file */
1873 if((what & trackdb_files)) {
1874 track = xstrndup(k.data, k.size);
1875 if((err = trackdb_getdata(trackdb_prefsdb,
1876 track, &p, tid)) == DB_LOCK_DEADLOCK)
1878 /* if this file has an alias in the same directory then we skip it */
1879 if((err = compute_alias(&alias, track, p, tid)))
1881 if(!(alias && !strcmp(d_dirname(alias), d_dirname(track))))
1882 if(track_matches(dl, k.data, k.size, re))
1883 vector_append(v, track);
1886 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1894 case DB_LOCK_DEADLOCK:
1895 error(0, "error querying database: %s", db_strerror(err));
1898 fatal(0, "error querying database: %s", db_strerror(err));
1901 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1905 /* return the directories or files below @dir@ */
1906 char **trackdb_list(const char *dir, int *np, enum trackdb_listable what,
1914 tid = trackdb_begin_transaction();
1917 if(do_list(&v, dir, what, re, tid))
1920 for(n = 0; n < config->collection.n; ++n)
1921 if(do_list(&v, config->collection.s[n].root, what, re, tid))
1926 trackdb_abort_transaction(tid);
1928 trackdb_commit_transaction(tid);
1929 vector_terminate(&v);
1935 /* If S is tag:something, return something. Else return 0. */
1936 static const char *checktag(const char *s) {
1937 if(!strncmp(s, "tag:", 4))
1943 /* return a list of tracks containing all of the words given. If you
1944 * ask for only stopwords you get no tracks. */
1945 char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) {
1946 const char **w, *best = 0, *tag;
1947 char **twords, **tags;
1949 int i, j, n, err, what;
1959 *ntracks = 0; /* for early returns */
1960 /* normalize all the words */
1961 w = xmalloc(nwordlist * sizeof (char *));
1962 istag = xmalloc_noptr(nwordlist);
1963 for(n = 0; n < nwordlist; ++n) {
1967 w[n] = utf8_casefold_compat(wordlist[n], strlen(wordlist[n]), 0);
1968 if(checktag(w[n])) {
1969 ++ntags; /* count up tags */
1970 /* Normalize the tag */
1971 w[n] = normalize_tag(w[n] + 4, strlen(w[n] + 4));
1974 /* Normalize the search term by removing combining characters */
1975 if(!(w32 = utf8_to_utf32(w[n], strlen(w[n]), &nw32)))
1977 nw32 = remove_combining_chars(w32, nw32);
1978 if(!(w[n] = utf32_to_utf8(w32, nw32, 0)))
1983 /* find the longest non-stopword */
1984 for(n = 0; n < nwordlist; ++n)
1985 if(!istag[n] && !stopword(w[n]))
1986 if(!best || strlen(w[n]) > strlen(best))
1988 /* TODO: we should at least in principal be able to identify the word or tag
1989 * with the least matches in log time, and choose that as our primary search
1991 if(ntags && !best) {
1992 /* Only tags are listed. We limit to the first and narrow down with the
1994 best = istag[0] ? w[0] : 0;
1995 db = trackdb_tagsdb;
1998 /* We can limit to some word. */
1999 db = trackdb_searchdb;
2002 /* Only stopwords */
2008 tid = trackdb_begin_transaction();
2009 /* find all the tracks that have that word */
2014 cursor = trackdb_opencursor(db, tid);
2015 while(!(err = cursor->c_get(cursor, &k, &d, what))) {
2016 vector_append(&v, xstrndup(d.data, d.size));
2023 case DB_LOCK_DEADLOCK:
2024 error(0, "error querying %s database: %s", dbname, db_strerror(err));
2027 fatal(0, "error querying %s database: %s", dbname, db_strerror(err));
2029 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
2031 /* do a naive search over that (hopefuly fairly small) list of tracks */
2033 for(n = 0; n < v.nvec; ++n) {
2034 if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK))
2037 error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err));
2040 twords = track_to_words(v.vec[n], p);
2041 tags = parsetags(kvp_get(p, "tags"));
2042 for(i = 0; i < nwordlist; ++i) {
2045 /* Track must have this tag */
2046 for(j = 0; tags[j]; ++j)
2047 if(!strcmp(tag, tags[j])) break; /* tag found */
2048 if(!tags[j]) break; /* tag not found */
2050 /* Track must contain this word */
2051 for(j = 0; twords[j]; ++j)
2052 if(!strcmp(w[i], twords[j])) break; /* word found */
2053 if(!twords[j]) break; /* word not found */
2056 if(i >= nwordlist) /* all words found */
2057 vector_append(&u, v.vec[n]);
2061 trackdb_closecursor(cursor);
2063 trackdb_abort_transaction(tid);
2064 info("retrying search");
2066 trackdb_commit_transaction(tid);
2067 vector_terminate(&u);
2073 /* trackdb_scan **************************************************************/
2075 int trackdb_scan(const char *root,
2076 int (*callback)(const char *track,
2084 const size_t root_len = root ? strlen(root) : 0;
2089 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
2091 err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d),
2094 memset(&k, 0, sizeof k);
2095 err = cursor->c_get(cursor, &k, prepare_data(&d),
2100 || (k.size > root_len
2101 && !strncmp(k.data, root, root_len)
2102 && ((char *)k.data)[root_len] == '/')) {
2103 data = kvp_urldecode(d.data, d.size);
2104 if(kvp_get(data, "_path")) {
2105 track = xstrndup(k.data, k.size);
2106 /* Advance to the next track before the callback so that the callback
2107 * may safely delete the track */
2108 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
2109 if((cberr = callback(track, data, u, tid))) {
2114 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
2118 trackdb_closecursor(cursor);
2125 case DB_LOCK_DEADLOCK:
2126 error(0, "c->c_get: %s", db_strerror(err));
2129 fatal(0, "c->c_get: %s", db_strerror(err));
2133 /* trackdb_rescan ************************************************************/
2135 /* called when the rescanner terminates */
2136 static int reap_rescan(ev_source attribute((unused)) *ev,
2139 const struct rusage attribute((unused)) *rusage,
2140 void attribute((unused)) *u) {
2141 if(pid == rescan_pid) rescan_pid = -1;
2143 error(0, RESCAN": %s", wstat(status));
2145 D((RESCAN" terminated: %s", wstat(status)));
2146 /* Our cache of file lookups is out of date now */
2147 cache_clean(&cache_files_type);
2148 eventlog("rescanned", (char *)0);
2152 void trackdb_rescan(ev_source *ev) {
2155 if(rescan_pid != -1) {
2156 error(0, "rescan already underway");
2159 rescan_pid = subprogram(ev, RESCAN, -1);
2161 ev_child(ev, rescan_pid, 0, reap_rescan, 0);
2162 D(("started rescanner"));
2164 /* This is the first rescan, we block until it is complete */
2165 while(waitpid(rescan_pid, &w, 0) < 0 && errno == EINTR)
2167 reap_rescan(0, rescan_pid, w, 0, 0);
2171 int trackdb_rescan_cancel(void) {
2172 if(rescan_pid == -1) return 0;
2173 if(kill(rescan_pid, SIGTERM) < 0)
2174 fatal(errno, "error killing rescanner");
2179 /* global prefs **************************************************************/
2181 void trackdb_set_global(const char *name,
2189 tid = trackdb_begin_transaction();
2190 if(!(err = trackdb_set_global_tid(name, value, tid)))
2192 trackdb_abort_transaction(tid);
2194 trackdb_commit_transaction(tid);
2195 /* log important state changes */
2196 if(!strcmp(name, "playing")) {
2197 state = !value || !strcmp(value, "yes");
2198 info("playing %s by %s",
2199 state ? "enabled" : "disabled",
2201 eventlog("state", state ? "enable_play" : "disable_play", (char *)0);
2203 if(!strcmp(name, "random-play")) {
2204 state = !value || !strcmp(value, "yes");
2205 info("random play %s by %s",
2206 state ? "enabled" : "disabled",
2208 eventlog("state", state ? "enable_random" : "disable_random", (char *)0);
2210 if(!strcmp(name, "required-tags"))
2214 int trackdb_set_global_tid(const char *name,
2220 memset(&k, 0, sizeof k);
2221 memset(&d, 0, sizeof d);
2222 k.data = (void *)name;
2223 k.size = strlen(name);
2225 d.data = (void *)value;
2226 d.size = strlen(value);
2229 err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0);
2231 err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0);
2232 if(err == DB_LOCK_DEADLOCK) return err;
2234 fatal(0, "error updating database: %s", db_strerror(err));
2238 const char *trackdb_get_global(const char *name) {
2244 tid = trackdb_begin_transaction();
2245 if(!(err = trackdb_get_global_tid(name, tid, &r)))
2247 trackdb_abort_transaction(tid);
2249 trackdb_commit_transaction(tid);
2253 int trackdb_get_global_tid(const char *name,
2259 memset(&k, 0, sizeof k);
2260 k.data = (void *)name;
2261 k.size = strlen(name);
2262 switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k,
2263 prepare_data(&d), 0)) {
2265 *rp = xstrndup(d.data, d.size);
2270 case DB_LOCK_DEADLOCK:
2273 fatal(0, "error reading database: %s", db_strerror(err));
2277 /** @brief Retrieve the most recently added tracks
2278 * @param ntracksp Where to put count, or 0
2279 * @param maxtracks Maximum number of tracks to retrieve
2280 * @return null-terminated array of track names
2282 * The most recently added track is first in the array.
2284 char **trackdb_new(int *ntracksp,
2290 tid = trackdb_begin_transaction();
2291 tracks = trackdb_new_tid(ntracksp, maxtracks, tid);
2294 trackdb_abort_transaction(tid);
2296 trackdb_commit_transaction(tid);
2300 /** @brief Retrieve the most recently added tracks
2301 * @param ntracksp Where to put count, or 0
2302 * @param maxtracks Maximum number of tracks to retrieve, or 0 for all
2303 * @param tid Transaction ID
2304 * @return null-terminated array of track names, or NULL on deadlock
2306 * The most recently added track is first in the array.
2308 static char **trackdb_new_tid(int *ntracksp,
2314 struct vector tracks[1];
2316 vector_init(tracks);
2317 c = trackdb_opencursor(trackdb_noticeddb, tid);
2318 while((maxtracks <= 0 || tracks->nvec < maxtracks)
2319 && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV)))
2320 vector_append(tracks, xstrndup(d.data, d.size));
2322 case 0: /* hit maxtracks */
2323 case DB_NOTFOUND: /* ran out of tracks */
2325 case DB_LOCK_DEADLOCK:
2326 trackdb_closecursor(c);
2329 fatal(0, "error reading noticed.db: %s", db_strerror(err));
2331 if((err = trackdb_closecursor(c)))
2332 return 0; /* deadlock */
2333 vector_terminate(tracks);
2335 *ntracksp = tracks->nvec;
2339 /** @brief Expire noticed.db
2340 * @param earliest Earliest timestamp to keep
2342 void trackdb_expire_noticed(time_t earliest) {
2346 tid = trackdb_begin_transaction();
2347 if(!trackdb_expire_noticed_tid(earliest, tid))
2349 trackdb_abort_transaction(tid);
2351 trackdb_commit_transaction(tid);
2354 /** @brief Expire noticed.db
2355 * @param earliest Earliest timestamp to keep
2356 * @param tid Transaction ID
2357 * @return 0 or DB_LOCK_DEADLOCK
2359 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) {
2367 c = trackdb_opencursor(trackdb_noticeddb, tid);
2368 while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) {
2370 when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1]));
2371 if(when >= earliest)
2373 if((err = c->c_del(c, 0))) {
2374 if(err != DB_LOCK_DEADLOCK)
2375 fatal(0, "error deleting expired noticed.db entry: %s",
2381 if(err == DB_NOTFOUND)
2383 if(err && err != DB_LOCK_DEADLOCK)
2384 fatal(0, "error expiring noticed.db: %s", db_strerror(err));
2386 if((err = trackdb_closecursor(c))) {
2387 if(err != DB_LOCK_DEADLOCK)
2388 fatal(0, "error closing cursor: %s", db_strerror(err));
2392 info("expired %d tracks from noticed.db", count);
2396 /* tidying up ****************************************************************/
2398 void trackdb_gc(void) {
2402 if((err = trackdb_env->txn_checkpoint(trackdb_env,
2403 config->checkpoint_kbyte,
2404 config->checkpoint_min,
2406 fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err));
2407 if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE)))
2408 fatal(0, "trackdb_env->log_archive: %s", db_strerror(err));
2409 /* This makes catastrophic recovery impossible. However, the user can still
2410 * preserve the important data by using disorder-dump to snapshot their
2411 * prefs, and later to restore it. This is likely to have much small
2412 * long-term storage requirements than record the db logfiles. */
2415 /* user database *************************************************************/
2417 /** @brief Return true if @p user is trusted */
2418 static int trusted(const char *user) {
2421 for(n = 0; (n < config->trust.n
2422 && strcmp(config->trust.s[n], user)); ++n)
2424 return n < config->trust.n;
2427 /** @brief Add a user */
2428 static int create_user(const char *user,
2429 const char *password,
2437 /* data for this user */
2439 kvp_set(&k, "password", password);
2440 kvp_set(&k, "rights", rights);
2442 kvp_set(&k, "email", email);
2443 snprintf(s, sizeof s, "%jd", (intmax_t)time(0));
2444 kvp_set(&k, "created", s);
2445 return trackdb_putdata(trackdb_usersdb, user, k, tid, flags);
2448 /** @brief Add one pre-existing user */
2449 static int one_old_user(const char *user, const char *password,
2453 /* www-data doesn't get added */
2454 if(!strcmp(user, "www-data")) {
2455 info("not adding www-data to user database");
2459 if(!strcmp(user, "root"))
2461 else if(trusted(user))
2462 rights = rights_string(default_rights()|RIGHT_ADMIN);
2464 rights = rights_string(default_rights());
2465 return create_user(user, password, rights, 0/*email*/, tid, DB_NOOVERWRITE);
2468 static int trackdb_old_users_tid(DB_TXN *tid) {
2471 for(n = 0; n < config->allow.n; ++n) {
2472 switch(one_old_user(config->allow.s[n].s[0], config->allow.s[n].s[1],
2475 info("created user %s from 'allow' directive", config->allow.s[n].s[0]);
2478 error(0, "user %s already exists, delete 'allow' directive",
2479 config->allow.s[n].s[0]);
2480 /* This won't ever become fatal - eventually 'allow' will be
2483 case DB_LOCK_DEADLOCK:
2484 return DB_LOCK_DEADLOCK;
2490 /** @brief Read old 'allow' directives and copy them to the users database */
2491 void trackdb_old_users(void) {
2495 WITH_TRANSACTION(trackdb_old_users_tid(tid));
2498 /** @brief Create a root user in the user database if there is none */
2499 void trackdb_create_root(void) {
2504 /* Choose a new root password */
2505 gcry_randomize(pwbin, sizeof pwbin, GCRY_STRONG_RANDOM);
2506 pw = mime_to_base64(pwbin, sizeof pwbin);
2507 /* Create the root user if it does not exist */
2508 WITH_TRANSACTION(create_user("root", pw, "all", 0/*email*/, tid,
2511 info("created root user");
2514 /** @brief Find a user's password from the database
2515 * @param user Username
2516 * @return Password or NULL
2518 * Only works if running as a user that can read the database!
2520 * If the user exists but has no password, "" is returned.
2522 * If the user was created with 'register' and has not yet been confirmed then
2523 * NULL is still returned.
2525 const char *trackdb_get_password(const char *user) {
2528 const char *password;
2530 WITH_TRANSACTION(trackdb_getdata(trackdb_usersdb, user, &k, tid));
2533 if(kvp_get(k, "confirmation"))
2535 password = kvp_get(k, "password");
2536 return password ? password : "";
2539 /** @brief Add a new user
2540 * @param user Username
2541 * @param password Password or NULL
2542 * @param rights Initial rights
2543 * @param email Email address
2544 * @return 0 on success, non-0 on error
2546 int trackdb_adduser(const char *user,
2547 const char *password,
2549 const char *email) {
2551 const char *r = rights_string(rights);
2553 WITH_TRANSACTION(create_user(user, password, r, email,
2554 tid, DB_NOOVERWRITE));
2556 error(0, "cannot created user '%s' because they already exist", user);
2560 info("created user '%s' with rights '%s' and email address '%s'",
2563 info("created user '%s' with rights '%s'", user, r);
2568 /** @brief Delete a user
2569 * @param user User to delete
2570 * @param 0 on success, non-0 if the user didn't exist anyway
2572 int trackdb_deluser(const char *user) {
2575 WITH_TRANSACTION(trackdb_delkey(trackdb_usersdb, user, tid));
2577 error(0, "cannot delete user '%s' because they do not exist", user);
2580 info("deleted user '%s'", user);
2584 /** @brief Get user information
2585 * @param user User to query
2586 * @return Linked list of user information or NULL if user does not exist
2588 * Every user has at least a @c rights entry so NULL can be used to mean no
2591 struct kvp *trackdb_getuserinfo(const char *user) {
2595 WITH_TRANSACTION(trackdb_getdata(trackdb_usersdb, user, &k, tid));
2602 /** @brief Edit user information
2603 * @param user User to edit
2604 * @param key Key to change
2605 * @param value Value to set, or NULL to remove
2606 * @param tid Transaction ID
2607 * @return 0, DB_LOCK_DEADLOCK or DB_NOTFOUND
2609 static int trackdb_edituserinfo_tid(const char *user, const char *key,
2610 const char *value, DB_TXN *tid) {
2614 if((e = trackdb_getdata(trackdb_usersdb, user, &k, tid)))
2616 if(!kvp_set(&k, key, value))
2617 return 0; /* no change */
2618 return trackdb_putdata(trackdb_usersdb, user, k, tid, 0);
2621 /** @brief Edit user information
2622 * @param user User to edit
2623 * @param key Key to change
2624 * @param value Value to set, or NULL to remove
2625 * @return 0 on success, non-0 on error
2627 int trackdb_edituserinfo(const char *user,
2628 const char *key, const char *value) {
2631 if(!strcmp(key, "rights")) {
2633 error(0, "cannot remove 'rights' key from user '%s'", user);
2636 if(parse_rights(value, 0)) {
2637 error(0, "invalid rights string");
2640 } else if(!strcmp(key, "email")) {
2641 if(!strchr(value, '@')) {
2642 error(0, "invalid email address '%s' for user '%s'", user, value);
2645 } else if(!strcmp(key, "created")) {
2646 error(0, "cannot change creation date for user '%s'", user);
2648 } else if(strcmp(key, "password")
2649 && !strcmp(key, "confirmation")) {
2650 error(0, "unknown user info key '%s' for user '%s'", key, user);
2653 WITH_TRANSACTION(trackdb_edituserinfo_tid(user, key, value, tid));
2655 error(0, "unknown user '%s'", user);
2666 indent-tabs-mode:nil