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
27 #include <sys/socket.h>
34 #include <sys/resource.h>
36 #include <arpa/inet.h>
44 #include "configuration.h"
50 #include "trackname.h"
51 #include "trackdb-int.h"
57 #define RESCAN "disorder-rescan"
58 #define DEADLOCK "disorder-deadlock"
60 static const char *getpart(const char *track,
65 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp);
66 static int trackdb_get_global_tid(const char *name,
69 static char **trackdb_new_tid(int *ntracksp,
72 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid);
74 const struct cache_type cache_files_type = { 86400 };
75 unsigned long cache_files_hits, cache_files_misses;
77 /* setup and teardown ********************************************************/
79 static const char *home; /* home had better not change */
80 DB_ENV *trackdb_env; /* db environment */
81 DB *trackdb_tracksdb; /* the db itself */
82 DB *trackdb_prefsdb; /* preferences */
83 DB *trackdb_searchdb; /* the search database */
84 DB *trackdb_tagsdb; /* the tags database */
85 DB *trackdb_globaldb; /* global preferences */
86 DB *trackdb_noticeddb; /* when track noticed */
87 static pid_t db_deadlock_pid = -1; /* deadlock manager PID */
88 static pid_t rescan_pid = -1; /* rescanner PID */
89 static int initialized, opened; /* state */
91 /* tracks matched by required_tags */
92 static char **reqtracks;
93 static size_t nreqtracks;
95 /* comparison function for keys */
96 static int compare(DB attribute((unused)) *db_,
97 const DBT *a, const DBT *b) {
98 return compare_path_raw(a->data, a->size, b->data, b->size);
101 /* open environment */
102 void trackdb_init(int recover) {
104 static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL };
107 assert(initialized == 0);
110 if(strcmp(home, config->home))
111 fatal(0, "cannot change db home without server restart");
115 /* create environment */
116 if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s",
118 if((err = trackdb_env->set_alloc(trackdb_env,
119 xmalloc_noptr, xrealloc_noptr, xfree)))
120 fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err));
121 if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000)))
122 fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err));
123 if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000)))
124 fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err));
125 if((err = trackdb_env->open(trackdb_env, config->home,
131 |recover_type[recover],
133 fatal(0, "trackdb_env->open %s: %s", config->home, db_strerror(err));
134 trackdb_env->set_errpfx(trackdb_env, "DB");
135 trackdb_env->set_errfile(trackdb_env, stderr);
136 trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1);
137 trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1);
138 trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1);
139 D(("initialized database environment"));
142 /* called when deadlock manager terminates */
143 static int reap_db_deadlock(ev_source attribute((unused)) *ev,
144 pid_t attribute((unused)) pid,
146 const struct rusage attribute((unused)) *rusage,
147 void attribute((unused)) *u) {
148 db_deadlock_pid = -1;
150 fatal(0, "deadlock manager unexpectedly terminated: %s",
153 D(("deadlock manager terminated: %s", wstat(status)));
157 static pid_t subprogram(ev_source *ev, const char *prog,
161 /* If we're in the background then trap subprocess stdout/stderr */
162 if(!(pid = xfork())) {
164 ev_signal_atfork(ev);
165 signal(SIGPIPE, SIG_DFL);
170 /* If we were negatively niced, undo it. We don't bother checking for
171 * error, it's not that important. */
172 setpriority(PRIO_PROCESS, 0, 0);
173 execlp(prog, prog, "--config", configfile,
174 debugging ? "--debug" : "--no-debug",
175 log_default == &log_syslog ? "--syslog" : "--no-syslog",
177 fatal(errno, "error invoking %s", prog);
182 /* start deadlock manager */
183 void trackdb_master(ev_source *ev) {
184 assert(db_deadlock_pid == -1);
185 db_deadlock_pid = subprogram(ev, DEADLOCK, -1);
186 ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0);
187 D(("started deadlock manager"));
190 /* close environment */
191 void trackdb_deinit(void) {
195 assert(initialized == 1);
198 /* close the environment */
199 if((err = trackdb_env->close(trackdb_env, 0)))
200 fatal(0, "trackdb_env->close: %s", db_strerror(err));
202 if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0)
203 fatal(errno, "error killing rescanner");
205 /* terminate the deadlock manager */
206 if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0)
207 fatal(errno, "error killing deadlock manager");
208 db_deadlock_pid = -1;
210 D(("deinitialized database environment"));
213 /* open a specific database */
214 static DB *open_db(const char *path,
222 D(("open %s", path));
223 path = config_get_file(path);
224 if((err = db_create(&db, trackdb_env, 0)))
225 fatal(0, "db_create %s: %s", path, db_strerror(err));
227 if((err = db->set_flags(db, dbflags)))
228 fatal(0, "db->set_flags %s: %s", path, db_strerror(err));
229 if(dbtype == DB_BTREE)
230 if((err = db->set_bt_compare(db, compare)))
231 fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err));
232 if((err = db->open(db, 0, path, 0, dbtype,
233 openflags | DB_AUTO_COMMIT, mode)))
234 fatal(0, "db->open %s: %s", path, db_strerror(err));
238 /* open track databases */
239 void trackdb_open(void) {
243 /* open the databases */
244 trackdb_tracksdb = open_db("tracks.db",
245 DB_RECNUM, DB_BTREE, DB_CREATE, 0666);
246 trackdb_searchdb = open_db("search.db",
247 DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
248 trackdb_tagsdb = open_db("tags.db",
249 DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
250 trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666);
251 trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666);
252 trackdb_noticeddb = open_db("noticed.db",
253 DB_DUPSORT, DB_BTREE, DB_CREATE, 0666);
254 D(("opened databases"));
257 /* close track databases */
258 void trackdb_close(void) {
264 if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0)))
265 fatal(0, "error closing tracks.db: %s", db_strerror(err));
266 if((err = trackdb_searchdb->close(trackdb_searchdb, 0)))
267 fatal(0, "error closing search.db: %s", db_strerror(err));
268 if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0)))
269 fatal(0, "error closing tags.db: %s", db_strerror(err));
270 if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0)))
271 fatal(0, "error closing prefs.db: %s", db_strerror(err));
272 if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
273 fatal(0, "error closing global.db: %s", db_strerror(err));
274 if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0)))
275 fatal(0, "error closing noticed.db: %s", db_strerror(err));
276 trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0;
277 trackdb_tagsdb = trackdb_globaldb = 0;
278 D(("closed databases"));
281 /* generic db routines *******************************************************/
283 /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or
284 * DB_LOCK_DEADLOCK. */
285 int trackdb_getdata(DB *db,
292 switch(err = db->get(db, tid, make_key(&key, track),
293 prepare_data(&data), 0)) {
295 *kp = kvp_urldecode(data.data, data.size);
300 case DB_LOCK_DEADLOCK:
301 error(0, "error querying database: %s", db_strerror(err));
304 fatal(0, "error querying database: %s", db_strerror(err));
308 /* encode and store a database entry. Returns 0, DB_KEYEXIST or
309 * DB_LOCK_DEADLOCK. */
310 int trackdb_putdata(DB *db,
318 switch(err = db->put(db, tid, make_key(&key, track),
319 encode_data(&data, k), flags)) {
323 case DB_LOCK_DEADLOCK:
324 error(0, "error updating database: %s", db_strerror(err));
327 fatal(0, "error updating database: %s", db_strerror(err));
331 /* delete a database entry */
332 int trackdb_delkey(DB *db,
338 switch(err = db->del(db, tid, make_key(&key, track), 0)) {
342 case DB_LOCK_DEADLOCK:
343 error(0, "error updating database: %s", db_strerror(err));
346 fatal(0, "error updating database: %s", db_strerror(err));
350 /* open a database cursor */
351 DBC *trackdb_opencursor(DB *db, DB_TXN *tid) {
355 switch(err = db->cursor(db, tid, &c, 0)) {
357 default: fatal(0, "error creating cursor: %s", db_strerror(err));
362 /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */
363 int trackdb_closecursor(DBC *c) {
367 switch(err = c->c_close(c)) {
370 case DB_LOCK_DEADLOCK:
371 error(0, "error closing cursor: %s", db_strerror(err));
374 fatal(0, "error closing cursor: %s", db_strerror(err));
378 /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
379 int trackdb_delkeydata(DB *db,
387 c = trackdb_opencursor(db, tid);
388 switch(err = c->c_get(c, make_key(&key, word),
389 make_key(&data, track), DB_GET_BOTH)) {
391 switch(err = c->c_del(c, 0)) {
397 case DB_LOCK_DEADLOCK:
398 error(0, "error updating database: %s", db_strerror(err));
401 fatal(0, "c->c_del: %s", db_strerror(err));
406 case DB_LOCK_DEADLOCK:
407 error(0, "error updating database: %s", db_strerror(err));
410 fatal(0, "c->c_get: %s", db_strerror(err));
412 if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK;
416 /* start a transaction */
417 DB_TXN *trackdb_begin_transaction(void) {
421 if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0)))
422 fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err));
426 /* abort transaction */
427 void trackdb_abort_transaction(DB_TXN *tid) {
431 if((err = tid->abort(tid)))
432 fatal(0, "tid->abort: %s", db_strerror(err));
435 /* commit transaction */
436 void trackdb_commit_transaction(DB_TXN *tid) {
439 if((err = tid->commit(tid, 0)))
440 fatal(0, "tid->commit: %s", db_strerror(err));
443 /* search/tags shared code ***************************************************/
445 /* comparison function used by dedupe() */
446 static int wordcmp(const void *a, const void *b) {
447 return strcmp(*(const char **)a, *(const char **)b);
450 /* sort and de-dupe VEC */
451 static char **dedupe(char **vec, int nvec) {
454 qsort(vec, nvec, sizeof (char *), wordcmp);
458 for(n = 1; n < nvec; ++n)
459 if(strcmp(vec[n], vec[m - 1]))
466 /* update a key/track database. Returns 0 or DB_DEADLOCK. */
467 static int register_word(DB *db, const char *what,
468 const char *track, const char *word,
473 switch(err = db->put(db, tid, make_key(&key, word),
474 make_key(&data, track), DB_NODUPDATA)) {
478 case DB_LOCK_DEADLOCK:
479 error(0, "error updating %s.db: %s", what, db_strerror(err));
482 fatal(0, "error updating %s.db: %s", what, db_strerror(err));
486 /* search primitives *********************************************************/
488 /* return true iff NAME is a trackname_display_ pref */
489 static int is_display_pref(const char *name) {
490 static const char prefix[] = "trackname_display_";
491 return !strncmp(name, prefix, (sizeof prefix) - 1);
494 /* compute the words of a track name */
495 static char **track_to_words(const char *track,
496 const struct kvp *p) {
500 const char *rootless = track_rootless(track);
503 rootless = track; /* bodge */
505 if((w = words(casefold(strip_extension(rootless)), &nw)))
506 vector_append_many(&v, w, nw);
508 for(; p; p = p->next)
509 if(is_display_pref(p->name))
510 if((w = words(casefold(p->value), &nw)))
511 vector_append_many(&v, w, nw);
512 vector_terminate(&v);
513 return dedupe(v.vec, v.nvec);
516 /* return nonzero iff WORD is a stopword */
517 static int stopword(const char *word) {
520 for(n = 0; n < config->stopword.n
521 && strcmp(word, config->stopword.s[n]); ++n)
523 return n < config->stopword.n;
526 /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */
527 static int register_search_word(const char *track, const char *word,
529 if(stopword(word)) return 0;
530 return register_word(trackdb_searchdb, "search", track, word, tid);
533 /* Tags **********************************************************************/
535 /* Return nonzero if C is a valid tag character */
536 static int tagchar(int c) {
545 /* Parse and de-dupe a tag list. If S=0 then assumes "". */
546 static char **parsetags(const char *s) {
552 /* skip initial separators */
553 while(*s && (!tagchar(*s) || *s == ' '))
556 /* find the extent of the tag */
558 while(*s && tagchar(*s))
560 /* strip trailing spaces */
561 while(s > t && s[-1] == ' ')
563 vector_append(&v, xstrndup(t, s - t));
564 /* skip intermediate and trailing separators */
565 while(*s && (!tagchar(*s) || *s == ' '))
569 vector_terminate(&v);
570 return dedupe(v.vec, v.nvec);
573 /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */
574 static int register_tag(const char *track, const char *tag, DB_TXN *tid) {
575 return register_word(trackdb_tagsdb, "tags", track, tag, tid);
578 /* aliases *******************************************************************/
580 /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If
581 * there is no alias sets *aliasp to 0. */
582 static int compute_alias(char **aliasp,
587 const char *s = config->alias, *t, *expansion, *part;
588 int c, used_db = 0, slash_prefix, err;
590 const char *const root = find_track_root(track);
593 /* Bodge for tracks with no root */
598 dynstr_append_string(&d, root);
599 while((c = (unsigned char)*s++)) {
601 dynstr_append(&d, c);
604 if((slash_prefix = (*s == '/')))
607 assert(t != 0); /* validated at startup */
608 part = xstrndup(s, t - s);
609 expansion = getpart(track, "display", part, p, &used_db);
611 if(slash_prefix) dynstr_append(&d, '/');
612 dynstr_append_string(&d, expansion);
614 s = t + 1; /* skip {part} */
616 /* only admit to the alias if we used the db... */
621 dynstr_terminate(&d);
622 /* ...and the answer differs from the original... */
623 if(!strcmp(track, d.vec)) {
627 /* ...and there isn't already a different track with that name (including as
629 switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) {
631 if((s = kvp_get(at, "_alias_for"))
632 && !strcmp(s, track)) {
644 /* get track and prefs data (if tp/pp not null pointers). Returns 0 on
645 * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK.
646 * Always sets the return values, even if only to null pointers. */
647 static int gettrackdata(const char *track,
650 const char **actualp,
652 #define GTD_NOALIAS 0x0001
655 const char *actual = track;
656 struct kvp *t = 0, *p = 0;
658 if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done;
659 if((actual = kvp_get(t, "_alias_for"))) {
660 if(flags & GTD_NOALIAS) {
661 error(0, "alias passed to gettrackdata where real path required");
664 if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done;
669 if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK)
674 if(actualp) *actualp = actual;
680 /* trackdb_notice() **********************************************************/
682 /** @brief notice a possibly new track
683 * @return @c DB_NOTFOUND if new, 0 if already known
685 int trackdb_notice(const char *track,
691 tid = trackdb_begin_transaction();
692 err = trackdb_notice_tid(track, path, tid);
693 if((err == DB_LOCK_DEADLOCK)) goto fail;
696 trackdb_abort_transaction(tid);
698 trackdb_commit_transaction(tid);
702 /** @brief notice a possibly new track
703 * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also
705 int trackdb_notice_tid(const char *track,
709 struct kvp *t, *a, *p;
713 /* notice whether the tracks.db entry changes */
715 /* get any existing tracks entry */
716 if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK)
718 ret = err; /* 0 or DB_NOTFOUND */
719 /* this is a real track */
720 t_changed += kvp_set(&t, "_alias_for", 0);
721 t_changed += kvp_set(&t, "_path", path);
722 /* if we have an alias record it in the database */
723 if((err = compute_alias(&alias, track, p, tid))) return err;
725 /* won't overwrite someone else's alias as compute_alias() checks */
726 D(("%s: alias %s", track, alias));
728 kvp_set(&a, "_alias_for", track);
729 if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err;
731 /* update search.db */
732 w = track_to_words(track, p);
733 for(n = 0; w[n]; ++n)
734 if((err = register_search_word(track, w[n], tid)))
737 w = parsetags(kvp_get(p, "tags"));
738 for(n = 0; w[n]; ++n)
739 if((err = register_tag(track, w[n], tid)))
742 /* only store the tracks.db entry if it has changed */
743 if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)))
745 if(ret == DB_NOTFOUND) {
746 uint32_t timestamp[2];
751 timestamp[0] = htonl((uint64_t)now >> 32);
752 timestamp[1] = htonl((uint32_t)now);
753 memset(&key, 0, sizeof key);
754 key.data = timestamp;
755 key.size = sizeof timestamp;
756 switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key,
757 make_key(&data, track), 0)) {
759 case DB_LOCK_DEADLOCK: return err;
760 default: fatal(0, "error updating noticed.db: %s", db_strerror(err));
766 /* trackdb_obsolete() ********************************************************/
768 /* obsolete a track */
769 int trackdb_obsolete(const char *track, DB_TXN *tid) {
774 if((err = gettrackdata(track, 0, &p, 0,
775 GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK)
777 else if(err == DB_NOTFOUND) return 0;
778 /* compute the alias, if any, and delete it */
779 if(compute_alias(&alias, track, p, tid)) return err;
781 /* if the alias points to some other track then compute_alias won't
783 if(trackdb_delkey(trackdb_tracksdb, alias, tid))
786 /* update search.db */
787 w = track_to_words(track, p);
788 for(n = 0; w[n]; ++n)
789 if(trackdb_delkeydata(trackdb_searchdb,
790 w[n], track, tid) == DB_LOCK_DEADLOCK)
793 w = parsetags(kvp_get(p, "tags"));
794 for(n = 0; w[n]; ++n)
795 if(trackdb_delkeydata(trackdb_tagsdb,
796 w[n], track, tid) == DB_LOCK_DEADLOCK)
799 /* update tracks.db */
800 if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK)
802 /* We don't delete the prefs, so they survive temporary outages of the
803 * (possibly virtual) track filesystem */
807 /* trackdb_stats() ***********************************************************/
809 #define H(name) { #name, offsetof(DB_HASH_STAT, name) }
810 #define B(name) { #name, offsetof(DB_BTREE_STAT, name) }
812 static const struct statinfo {
815 } statinfo_hash[] = {
831 }, statinfo_btree[] = {
852 /* look up stats for DB */
853 static int get_stats(struct vector *v,
855 const struct statinfo *si,
864 switch(err = database->stat(database, tid, &sp, 0)) {
867 case DB_LOCK_DEADLOCK:
868 error(0, "error querying database: %s", db_strerror(err));
871 fatal(0, "error querying database: %s", db_strerror(err));
873 for(n = 0; n < nsi; ++n) {
874 byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name,
875 (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset));
876 vector_append(v, str);
882 struct search_entry {
887 /* find the top COUNT words in the search database */
888 static int search_league(struct vector *v, int count, DB_TXN *tid) {
889 struct search_entry *se;
892 int err, n = 0, nse = 0, i;
897 cursor = trackdb_opencursor(trackdb_searchdb, tid);
898 se = xmalloc(count * sizeof *se);
899 while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
901 if(word && wl == k.size && !strncmp(word, k.data, wl))
904 #define FINALIZE() do { \
905 if(word && (nse < count || n > se[nse - 1].n)) { \
910 while(i > 0 && n > se[i - 1].n) \
912 memmove(&se[i + 1], &se[i], (nse - i) * sizeof *se); \
918 word = xstrndup(k.data, wl = k.size);
926 case DB_LOCK_DEADLOCK:
927 error(0, "error querying search database: %s", db_strerror(err));
930 fatal(0, "error querying search database: %s", db_strerror(err));
932 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
935 byte_xasprintf(&str, "Top %d search words:", nse);
936 vector_append(v, str);
937 for(i = 0; i < nse; ++i) {
938 byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word);
939 vector_append(v, str);
944 #define SI(what) statinfo_##what, \
945 sizeof statinfo_##what / sizeof (struct statinfo)
947 /* return a list of database stats */
948 char **trackdb_stats(int *nstatsp) {
954 tid = trackdb_begin_transaction();
956 vector_append(&v, (char *)"Tracks database stats:");
957 if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail;
958 vector_append(&v, (char *)"");
959 vector_append(&v, (char *)"Search database stats:");
960 if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail;
961 vector_append(&v, (char *)"");
962 vector_append(&v, (char *)"Prefs database stats:");
963 if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail;
964 vector_append(&v, (char *)"");
965 if(search_league(&v, 10, tid)) goto fail;
966 vector_terminate(&v);
969 trackdb_abort_transaction(tid);
971 trackdb_commit_transaction(tid);
972 if(nstatsp) *nstatsp = v.nvec;
976 struct stats_details {
977 void (*done)(char *data, void *u);
979 int exited; /* subprocess exited */
980 int closed; /* pipe close */
981 int wstat; /* wait status from subprocess */
982 struct dynstr data[1]; /* data read from pipe */
985 static void stats_complete(struct stats_details *d) {
988 if(!(d->exited && d->closed))
990 byte_xasprintf(&s, "\n"
992 "track lookup cache hits: %lu\n"
993 "track lookup cache misses: %lu\n",
996 dynstr_append_string(d->data, s);
997 dynstr_terminate(d->data);
998 d->done(d->data->vec, d->u);
1001 static int stats_finished(ev_source attribute((unused)) *ev,
1002 pid_t attribute((unused)) pid,
1004 const struct rusage attribute((unused)) *rusage,
1006 struct stats_details *const d = u;
1010 error(0, "disorder-stats %s", wstat(status));
1015 static int stats_read(ev_source attribute((unused)) *ev,
1021 struct stats_details *const d = u;
1023 dynstr_append_bytes(d->data, ptr, bytes);
1024 ev_reader_consume(reader, bytes);
1031 static int stats_error(ev_source attribute((unused)) *ev,
1034 struct stats_details *const d = u;
1036 error(errno_value, "error reading from pipe to disorder-stats");
1042 void trackdb_stats_subprocess(ev_source *ev,
1043 void (*done)(char *data, void *u),
1047 struct stats_details *d = xmalloc(sizeof *d);
1049 dynstr_init(d->data);
1053 pid = subprogram(ev, "disorder-stats", p[1]);
1055 ev_child(ev, pid, 0, stats_finished, d);
1056 ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader");
1059 /* set a pref (remove if value=0) */
1060 int trackdb_set(const char *track,
1062 const char *value) {
1063 struct kvp *t, *p, *a;
1066 char *oldalias, *newalias, **oldtags = 0, **newtags;
1069 /* TODO: if value matches default then set value=0 */
1073 tid = trackdb_begin_transaction();
1074 if((err = gettrackdata(track, &t, &p, 0,
1075 0, tid)) == DB_LOCK_DEADLOCK)
1077 if(err == DB_NOTFOUND) break;
1078 if(name[0] == '_') {
1079 if(kvp_set(&t, name, value))
1080 if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))
1083 /* get the old alias name */
1084 if(compute_alias(&oldalias, track, p, tid)) goto fail;
1085 /* get the old tags */
1086 if(!strcmp(name, "tags"))
1087 oldtags = parsetags(kvp_get(p, "tags"));
1089 if(kvp_set(&p, name, value))
1090 if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0))
1092 /* compute the new alias name */
1093 if((err = compute_alias(&newalias, track, p, tid))) goto fail;
1094 /* check whether alias has changed */
1095 if(!(oldalias == newalias
1096 || (oldalias && newalias && !strcmp(oldalias, newalias)))) {
1097 /* adjust alias records to fit change */
1099 && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail;
1102 kvp_set(&a, "_alias_for", track);
1103 if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail;
1106 /* check whether tags have changed */
1107 if(!strcmp(name, "tags")) {
1108 newtags = parsetags(value);
1109 while(*oldtags || *newtags) {
1110 if(*oldtags && *newtags) {
1111 cmp = strcmp(*oldtags, *newtags);
1113 /* keeping this tag */
1117 /* old tag fits into a gap in the new list, so delete old */
1120 /* new tag fits into a gap in the old list, so insert new */
1122 } else if(*oldtags) {
1123 /* we've run out of new tags, so remaining old ones are to be
1126 if(trackdb_delkeydata(trackdb_tagsdb,
1127 *oldtags, track, tid) == DB_LOCK_DEADLOCK)
1131 /* we've run out of old tags, so remainig new ones are to be
1134 if(register_tag(track, *newtags, tid)) goto fail;
1144 trackdb_abort_transaction(tid);
1146 trackdb_commit_transaction(tid);
1147 return err == 0 ? 0 : -1;
1151 const char *trackdb_get(const char *track,
1153 return kvp_get(trackdb_get_all(track), name);
1156 /* get all prefs as a 0-terminated array */
1157 struct kvp *trackdb_get_all(const char *track) {
1158 struct kvp *t, *p, **pp;
1162 tid = trackdb_begin_transaction();
1163 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1167 trackdb_abort_transaction(tid);
1169 trackdb_commit_transaction(tid);
1170 for(pp = &p; *pp; pp = &(*pp)->next)
1177 const char *trackdb_resolve(const char *track) {
1182 tid = trackdb_begin_transaction();
1183 if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK)
1187 trackdb_abort_transaction(tid);
1189 trackdb_commit_transaction(tid);
1193 int trackdb_isalias(const char *track) {
1194 const char *actual = trackdb_resolve(track);
1196 return strcmp(actual, track);
1199 /* test whether a track exists (perhaps an alias) */
1200 int trackdb_exists(const char *track) {
1205 tid = trackdb_begin_transaction();
1206 /* unusually, here we want the return value */
1207 if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK)
1211 trackdb_abort_transaction(tid);
1213 trackdb_commit_transaction(tid);
1217 /* return the list of tags */
1218 char **trackdb_alltags(void) {
1224 tid = trackdb_begin_transaction();
1225 err = trackdb_alltags_tid(tid, &taglist);
1227 trackdb_abort_transaction(tid);
1229 trackdb_commit_transaction(tid);
1233 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) {
1240 c = trackdb_opencursor(trackdb_tagsdb, tid);
1241 memset(&k, 0, sizeof k);
1242 while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP)))
1243 vector_append(&v, xstrndup(k.data, k.size));
1247 case DB_LOCK_DEADLOCK:
1250 fatal(0, "c->c_get: %s", db_strerror(err));
1252 if((err = trackdb_closecursor(c))) return err;
1253 vector_terminate(&v);
1258 /* return 1 iff sorted tag lists A and B have at least one member in common */
1259 static int tag_intersection(char **a, char **b) {
1262 /* Same sort of logic as trackdb_set() above */
1264 if(!(cmp = strcmp(*a, *b))) return 1;
1265 else if(cmp < 0) ++a;
1271 /* Check whether a track is suitable for random play. Returns 0 if it is,
1272 * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us
1274 static int check_suitable(const char *track,
1276 char **required_tags,
1277 char **prohibited_tags) {
1281 const char *pick_at_random, *played_time;
1283 /* don't pick tracks that aren't in any surviving collection (for instance
1284 * you've edited the config but the rescan hasn't done its job yet) */
1285 if(!find_track_root(track)) {
1286 info("found track not in any collection: %s", track);
1289 /* don't pick aliases - only pick the canonical form */
1290 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1291 return DB_LOCK_DEADLOCK;
1292 if(kvp_get(t, "_alias_for"))
1294 /* check that random play is not suppressed for this track */
1295 if((pick_at_random = kvp_get(p, "pick_at_random"))
1296 && !strcmp(pick_at_random, "0"))
1298 /* don't pick a track that's been played in the last 8 hours */
1299 if((played_time = kvp_get(p, "played_time"))) {
1300 last = atoll(played_time);
1302 if(now < last + 8 * 3600) /* TODO configurable */
1305 track_tags = parsetags(kvp_get(p, "tags"));
1306 /* check that no prohibited tag is present for this track */
1307 if(prohibited_tags && tag_intersection(track_tags, prohibited_tags))
1309 /* check that at least one required tags is present for this track */
1310 if(*required_tags && !tag_intersection(track_tags, required_tags))
1315 /* attempt to pick a random non-alias track */
1316 const char *trackdb_random(int tries) {
1321 const char *track, *candidate;
1324 char **required_tags, **prohibited_tags, **tp;
1329 tid = trackdb_begin_transaction();
1330 if((err = trackdb_get_global_tid("required-tags", tid, &tags)))
1332 required_tags = parsetags(tags);
1333 if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags)))
1335 prohibited_tags = parsetags(tags);
1337 if(*required_tags) {
1338 /* Bung all the suitable tracks into a hash and convert to a list of keys
1339 * (to eliminate duplicates). We cache this list since it is possible
1340 * that it will be very large. */
1343 for(tp = required_tags; *tp; ++tp) {
1344 c = trackdb_opencursor(trackdb_tagsdb, tid);
1345 memset(&key, 0, sizeof key);
1347 key.size = strlen(*tp);
1349 err = c->c_get(c, &key, prepare_data(&data), DB_SET);
1351 hash_add(h, xstrndup(data.data, data.size), 0,
1352 HASH_INSERT_OR_REPLACE);
1354 err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP);
1360 case DB_LOCK_DEADLOCK:
1363 fatal(0, "error querying tags.db: %s", db_strerror(err));
1365 trackdb_closecursor(c);
1368 error(0, "required tag %s does not match any tracks", *tp);
1370 nreqtracks = hash_count(h);
1371 reqtracks = hash_keys(h);
1373 while(nreqtracks && !track && tries-- > 0) {
1374 r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0));
1375 candidate = reqtracks[r];
1376 switch(check_suitable(candidate, tid,
1377 required_tags, prohibited_tags)) {
1383 case DB_LOCK_DEADLOCK:
1388 /* No required tags. We pick random record numbers in the database
1390 switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) {
1393 case DB_LOCK_DEADLOCK:
1394 error(0, "error querying tracks.db: %s", db_strerror(err));
1397 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1400 error(0, "cannot pick tracks at random from an empty database");
1401 while(sp->bt_nkeys && !track && tries-- > 0) {
1402 /* record numbers count from 1 upwards */
1403 r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0));
1404 memset(&key, sizeof key, 0);
1405 key.flags = DB_DBT_MALLOC;
1406 key.size = sizeof r;
1408 switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data),
1412 case DB_LOCK_DEADLOCK:
1413 error(0, "error querying tracks.db: %s", db_strerror(err));
1416 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1418 candidate = xstrndup(key.data, key.size);
1419 switch(check_suitable(candidate, tid,
1420 required_tags, prohibited_tags)) {
1426 case DB_LOCK_DEADLOCK:
1433 trackdb_closecursor(c);
1435 trackdb_abort_transaction(tid);
1437 trackdb_commit_transaction(tid);
1439 error(0, "could not pick a random track");
1443 /* get a track name given the prefs. Set *used_db to 1 if we got the answer
1444 * from the prefs. */
1445 static const char *getpart(const char *track,
1446 const char *context,
1448 const struct kvp *p,
1453 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1454 if((result = kvp_get(p, pref)))
1457 result = trackname_part(track, context, part);
1458 assert(result != 0);
1462 /* get a track name part, like trackname_part(), but taking the database into
1464 const char *trackdb_getpart(const char *track,
1465 const char *context,
1473 /* construct the full pref */
1474 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1476 tid = trackdb_begin_transaction();
1477 if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK)
1481 trackdb_abort_transaction(tid);
1483 trackdb_commit_transaction(tid);
1484 return getpart(actual, context, part, p, &used_db);
1487 /* get the raw path name for @track@ (might be an alias) */
1488 const char *trackdb_rawpath(const char *track) {
1494 tid = trackdb_begin_transaction();
1495 if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK)
1499 trackdb_abort_transaction(tid);
1501 trackdb_commit_transaction(tid);
1502 if(!(path = kvp_get(t, "_path"))) path = track;
1506 /* trackdb_list **************************************************************/
1508 /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually
1509 * readable at some point */
1511 /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE.
1512 * If RE is a null pointer then it matches everything. */
1513 static int track_matches(size_t dl, const char *track, size_t tl,
1521 switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) {
1522 case PCRE_ERROR_NOMATCH: return 0;
1525 error(0, "pcre_exec returned %d, subject '%s'", rc, track);
1532 static int do_list(struct vector *v, const char *dir,
1533 enum trackdb_listable what, const pcre *re, DB_TXN *tid) {
1539 size_t l, last_dir_len = 0;
1540 char *last_dir = 0, *track, *alias;
1544 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1547 /* find the first key >= dir */
1548 err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE);
1549 /* keep going while we're dealing with <dir/anything> */
1552 && ((char *)k.data)[dl] == '/'
1553 && !memcmp(k.data, dir, dl)) {
1554 ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1));
1556 /* we have <dir/component/anything>, so <dir/component> is a directory */
1557 l = ptr - (char *)k.data;
1558 if(what & trackdb_directories)
1560 && l == last_dir_len
1561 && !memcmp(last_dir, k.data, l))) {
1562 last_dir = xstrndup(k.data, last_dir_len = l);
1563 if(track_matches(dl, k.data, l, re))
1564 vector_append(v, last_dir);
1567 /* found a plain file */
1568 if((what & trackdb_files)) {
1569 track = xstrndup(k.data, k.size);
1570 if((err = trackdb_getdata(trackdb_prefsdb,
1571 track, &p, tid)) == DB_LOCK_DEADLOCK)
1573 /* if this file has an alias in the same directory then we skip it */
1574 if((err = compute_alias(&alias, track, p, tid)))
1576 if(!(alias && !strcmp(d_dirname(alias), d_dirname(track))))
1577 if(track_matches(dl, k.data, k.size, re))
1578 vector_append(v, track);
1581 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1589 case DB_LOCK_DEADLOCK:
1590 error(0, "error querying database: %s", db_strerror(err));
1593 fatal(0, "error querying database: %s", db_strerror(err));
1596 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1600 /* return the directories or files below @dir@ */
1601 char **trackdb_list(const char *dir, int *np, enum trackdb_listable what,
1609 tid = trackdb_begin_transaction();
1612 if(do_list(&v, dir, what, re, tid))
1615 for(n = 0; n < config->collection.n; ++n)
1616 if(do_list(&v, config->collection.s[n].root, what, re, tid))
1621 trackdb_abort_transaction(tid);
1623 trackdb_commit_transaction(tid);
1624 vector_terminate(&v);
1630 /* If S is tag:something, return something. Else return 0. */
1631 static const char *checktag(const char *s) {
1632 if(!strncmp(s, "tag:", 4))
1638 /* return a list of tracks containing all of the words given. If you
1639 * ask for only stopwords you get no tracks. */
1640 char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) {
1641 const char **w, *best = 0, *tag;
1642 char **twords, **tags;
1643 int i, j, n, err, what;
1653 *ntracks = 0; /* for early returns */
1654 /* casefold all the words */
1655 w = xmalloc(nwordlist * sizeof (char *));
1656 for(n = 0; n < nwordlist; ++n) {
1657 w[n] = casefold(wordlist[n]);
1658 if(checktag(w[n])) ++ntags; /* count up tags */
1660 /* find the longest non-stopword */
1661 for(n = 0; n < nwordlist; ++n)
1662 if(!stopword(w[n]) && !checktag(w[n]))
1663 if(!best || strlen(w[n]) > strlen(best))
1665 /* TODO: we should at least in principal be able to identify the word or tag
1666 * with the least matches in log time, and choose that as our primary search
1668 if(ntags && !best) {
1669 /* Only tags are listed. We limit to the first and narrow down with the
1671 best = checktag(w[0]);
1672 db = trackdb_tagsdb;
1675 /* We can limit to some word. */
1676 db = trackdb_searchdb;
1679 /* Only stopwords */
1685 tid = trackdb_begin_transaction();
1686 /* find all the tracks that have that word */
1691 cursor = trackdb_opencursor(db, tid);
1692 while(!(err = cursor->c_get(cursor, &k, &d, what))) {
1693 vector_append(&v, xstrndup(d.data, d.size));
1700 case DB_LOCK_DEADLOCK:
1701 error(0, "error querying %s database: %s", dbname, db_strerror(err));
1704 fatal(0, "error querying %s database: %s", dbname, db_strerror(err));
1706 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1708 /* do a naive search over that (hopefuly fairly small) list of tracks */
1710 for(n = 0; n < v.nvec; ++n) {
1711 if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK))
1714 error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err));
1717 twords = track_to_words(v.vec[n], p);
1718 tags = parsetags(kvp_get(p, "tags"));
1719 for(i = 0; i < nwordlist; ++i) {
1720 if((tag = checktag(w[i]))) {
1721 /* Track must have this tag */
1722 for(j = 0; tags[j]; ++j)
1723 if(!strcmp(tag, tags[j])) break; /* tag found */
1724 if(!tags[j]) break; /* tag not found */
1726 /* Track must contain this word */
1727 for(j = 0; twords[j]; ++j)
1728 if(!strcmp(w[i], twords[j])) break; /* word found */
1729 if(!twords[j]) break; /* word not found */
1732 if(i >= nwordlist) /* all words found */
1733 vector_append(&u, v.vec[n]);
1737 trackdb_closecursor(cursor);
1739 trackdb_abort_transaction(tid);
1740 info("retrying search");
1742 trackdb_commit_transaction(tid);
1743 vector_terminate(&u);
1749 /* trackdb_scan **************************************************************/
1751 int trackdb_scan(const char *root,
1752 int (*callback)(const char *track,
1760 const size_t root_len = root ? strlen(root) : 0;
1765 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1767 err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d),
1770 memset(&k, 0, sizeof k);
1771 err = cursor->c_get(cursor, &k, prepare_data(&d),
1776 || (k.size > root_len
1777 && !strncmp(k.data, root, root_len)
1778 && ((char *)k.data)[root_len] == '/')) {
1779 data = kvp_urldecode(d.data, d.size);
1780 if(kvp_get(data, "_path")) {
1781 track = xstrndup(k.data, k.size);
1782 /* Advance to the next track before the callback so that the callback
1783 * may safely delete the track */
1784 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1785 if((cberr = callback(track, data, u, tid))) {
1790 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1794 trackdb_closecursor(cursor);
1801 case DB_LOCK_DEADLOCK:
1802 error(0, "c->c_get: %s", db_strerror(err));
1805 fatal(0, "c->c_get: %s", db_strerror(err));
1809 /* trackdb_rescan ************************************************************/
1811 /* called when the rescanner terminates */
1812 static int reap_rescan(ev_source attribute((unused)) *ev,
1815 const struct rusage attribute((unused)) *rusage,
1816 void attribute((unused)) *u) {
1817 if(pid == rescan_pid) rescan_pid = -1;
1819 error(0, "disorderd-rescan: %s", wstat(status));
1821 D(("disorderd-rescan terminate: %s", wstat(status)));
1822 /* Our cache of file lookups is out of date now */
1823 cache_clean(&cache_files_type);
1824 eventlog("rescanned", (char *)0);
1828 void trackdb_rescan(ev_source *ev) {
1829 if(rescan_pid != -1) {
1830 error(0, "rescan already underway");
1833 rescan_pid = subprogram(ev, RESCAN, -1);
1834 ev_child(ev, rescan_pid, 0, reap_rescan, 0);
1835 D(("started rescanner"));
1839 int trackdb_rescan_cancel(void) {
1840 if(rescan_pid == -1) return 0;
1841 if(kill(rescan_pid, SIGTERM) < 0)
1842 fatal(errno, "error killing rescanner");
1847 /* global prefs **************************************************************/
1849 void trackdb_set_global(const char *name,
1857 memset(&k, 0, sizeof k);
1858 memset(&d, 0, sizeof d);
1859 k.data = (void *)name;
1860 k.size = strlen(name);
1862 d.data = (void *)value;
1863 d.size = strlen(value);
1866 tid = trackdb_begin_transaction();
1868 err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0);
1870 err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0);
1871 if(!err || err == DB_NOTFOUND) break;
1872 if(err != DB_LOCK_DEADLOCK)
1873 fatal(0, "error updating database: %s", db_strerror(err));
1874 trackdb_abort_transaction(tid);
1876 trackdb_commit_transaction(tid);
1877 /* log important state changes */
1878 if(!strcmp(name, "playing")) {
1879 state = !value || !strcmp(value, "yes");
1880 info("playing %s by %s",
1881 state ? "enabled" : "disabled",
1883 eventlog("state", state ? "enable_play" : "disable_play", (char *)0);
1885 if(!strcmp(name, "random-play")) {
1886 state = !value || !strcmp(value, "yes");
1887 info("random play %s by %s",
1888 state ? "enabled" : "disabled",
1890 eventlog("state", state ? "enable_random" : "disable_random", (char *)0);
1892 if(!strcmp(name, "required-tags"))
1896 const char *trackdb_get_global(const char *name) {
1902 tid = trackdb_begin_transaction();
1903 if(!(err = trackdb_get_global_tid(name, tid, &r)))
1905 trackdb_abort_transaction(tid);
1907 trackdb_commit_transaction(tid);
1911 static int trackdb_get_global_tid(const char *name,
1917 memset(&k, 0, sizeof k);
1918 k.data = (void *)name;
1919 k.size = strlen(name);
1920 switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k,
1921 prepare_data(&d), 0)) {
1923 *rp = xstrndup(d.data, d.size);
1928 case DB_LOCK_DEADLOCK:
1931 fatal(0, "error updating database: %s", db_strerror(err));
1935 /** @brief Retrieve the most recently added tracks
1936 * @param ntracksp Where to put count, or 0
1937 * @param maxtracks Maximum number of tracks to retrieve
1938 * @return null-terminated array of track names
1940 * The most recently added track is first in the array.
1942 char **trackdb_new(int *ntracksp,
1948 tid = trackdb_begin_transaction();
1949 tracks = trackdb_new_tid(ntracksp, maxtracks, tid);
1952 trackdb_abort_transaction(tid);
1954 trackdb_commit_transaction(tid);
1958 /** @brief Retrieve the most recently added tracks
1959 * @param ntracksp Where to put count, or 0
1960 * @param maxtracks Maximum number of tracks to retrieve, or 0 for all
1961 * @param tid Transaction ID
1962 * @return null-terminated array of track names, or NULL on deadlock
1964 * The most recently added track is first in the array.
1966 static char **trackdb_new_tid(int *ntracksp,
1972 struct vector tracks[1];
1974 vector_init(tracks);
1975 c = trackdb_opencursor(trackdb_noticeddb, tid);
1976 while((maxtracks <= 0 || tracks->nvec < maxtracks)
1977 && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV)))
1978 vector_append(tracks, xstrndup(d.data, d.size));
1980 case 0: /* hit maxtracks */
1981 case DB_NOTFOUND: /* ran out of tracks */
1983 case DB_LOCK_DEADLOCK:
1984 trackdb_closecursor(c);
1987 fatal(0, "error reading noticed.db: %s", db_strerror(err));
1989 if((err = trackdb_closecursor(c)))
1990 return 0; /* deadlock */
1991 vector_terminate(tracks);
1993 *ntracksp = tracks->nvec;
1997 /** @brief Expire noticed.db
1998 * @param earliest Earliest timestamp to keep
2000 void trackdb_expire_noticed(time_t earliest) {
2004 tid = trackdb_begin_transaction();
2005 if(!trackdb_expire_noticed_tid(earliest, tid))
2007 trackdb_abort_transaction(tid);
2009 trackdb_commit_transaction(tid);
2012 /** @brief Expire noticed.db
2013 * @param earliest Earliest timestamp to keep
2014 * @param tid Transaction ID
2015 * @return 0 or DB_LOCK_DEADLOCK
2017 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) {
2025 c = trackdb_opencursor(trackdb_noticeddb, tid);
2026 while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) {
2028 when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1]));
2029 if(when >= earliest)
2031 if((err = c->c_del(c, 0))) {
2032 if(err != DB_LOCK_DEADLOCK)
2033 fatal(0, "error deleting expired noticed.db entry: %s",
2039 if(err == DB_NOTFOUND)
2041 if(err && err != DB_LOCK_DEADLOCK)
2042 fatal(0, "error expiring noticed.db: %s", db_strerror(err));
2044 if((err = trackdb_closecursor(c))) {
2045 if(err != DB_LOCK_DEADLOCK)
2046 fatal(0, "error closing cursor: %s", db_strerror(err));
2050 info("expired %d tracks from noticed.db", count);
2054 /* tidying up ****************************************************************/
2056 void trackdb_gc(void) {
2060 if((err = trackdb_env->txn_checkpoint(trackdb_env,
2061 config->checkpoint_kbyte,
2062 config->checkpoint_min,
2064 fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err));
2065 if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE)))
2066 fatal(0, "trackdb_env->log_archive: %s", db_strerror(err));
2067 /* This makes catastrophic recovery impossible. However, the user can still
2068 * preserve the important data by using disorder-dump to snapshot their
2069 * prefs, and later to restore it. This is likely to have much small
2070 * long-term storage requirements than record the db logfiles. */
2078 indent-tabs-mode:nil