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>
45 #include "configuration.h"
51 #include "trackname.h"
52 #include "trackdb-int.h"
58 #define RESCAN "disorder-rescan"
59 #define DEADLOCK "disorder-deadlock"
61 static const char *getpart(const char *track,
66 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp);
67 static int trackdb_get_global_tid(const char *name,
70 static char **trackdb_new_tid(int *ntracksp,
73 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid);
75 const struct cache_type cache_files_type = { 86400 };
76 unsigned long cache_files_hits, cache_files_misses;
78 /* setup and teardown ********************************************************/
80 static const char *home; /* home had better not change */
81 DB_ENV *trackdb_env; /* db environment */
82 DB *trackdb_tracksdb; /* the db itself */
83 DB *trackdb_prefsdb; /* preferences */
84 DB *trackdb_searchdb; /* the search database */
85 DB *trackdb_tagsdb; /* the tags database */
86 DB *trackdb_globaldb; /* global preferences */
87 DB *trackdb_noticeddb; /* when track noticed */
88 static pid_t db_deadlock_pid = -1; /* deadlock manager PID */
89 static pid_t rescan_pid = -1; /* rescanner PID */
90 static int initialized, opened; /* state */
92 /* tracks matched by required_tags */
93 static char **reqtracks;
94 static size_t nreqtracks;
96 /* comparison function for keys */
97 static int compare(DB attribute((unused)) *db_,
98 const DBT *a, const DBT *b) {
99 return compare_path_raw(a->data, a->size, b->data, b->size);
102 /* open environment */
103 void trackdb_init(int recover) {
105 static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL };
108 assert(initialized == 0);
111 if(strcmp(home, config->home))
112 fatal(0, "cannot change db home without server restart");
116 /* create environment */
117 if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s",
119 if((err = trackdb_env->set_alloc(trackdb_env,
120 xmalloc_noptr, xrealloc_noptr, xfree)))
121 fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err));
122 if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000)))
123 fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err));
124 if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000)))
125 fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err));
126 if((err = trackdb_env->open(trackdb_env, config->home,
132 |recover_type[recover],
134 fatal(0, "trackdb_env->open %s: %s", config->home, db_strerror(err));
135 trackdb_env->set_errpfx(trackdb_env, "DB");
136 trackdb_env->set_errfile(trackdb_env, stderr);
137 trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1);
138 trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1);
139 trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1);
140 D(("initialized database environment"));
143 /* called when deadlock manager terminates */
144 static int reap_db_deadlock(ev_source attribute((unused)) *ev,
145 pid_t attribute((unused)) pid,
147 const struct rusage attribute((unused)) *rusage,
148 void attribute((unused)) *u) {
149 db_deadlock_pid = -1;
151 fatal(0, "deadlock manager unexpectedly terminated: %s",
154 D(("deadlock manager terminated: %s", wstat(status)));
158 static pid_t subprogram(ev_source *ev, const char *prog,
162 /* If we're in the background then trap subprocess stdout/stderr */
163 if(!(pid = xfork())) {
166 ev_signal_atfork(ev);
167 signal(SIGPIPE, SIG_DFL);
172 /* If we were negatively niced, undo it. We don't bother checking for
173 * error, it's not that important. */
174 setpriority(PRIO_PROCESS, 0, 0);
175 execlp(prog, prog, "--config", configfile,
176 debugging ? "--debug" : "--no-debug",
177 log_default == &log_syslog ? "--syslog" : "--no-syslog",
179 fatal(errno, "error invoking %s", prog);
184 /* start deadlock manager */
185 void trackdb_master(ev_source *ev) {
186 assert(db_deadlock_pid == -1);
187 db_deadlock_pid = subprogram(ev, DEADLOCK, -1);
188 ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0);
189 D(("started deadlock manager"));
192 /* close environment */
193 void trackdb_deinit(void) {
197 assert(initialized == 1);
200 /* close the environment */
201 if((err = trackdb_env->close(trackdb_env, 0)))
202 fatal(0, "trackdb_env->close: %s", db_strerror(err));
204 if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0)
205 fatal(errno, "error killing rescanner");
207 /* terminate the deadlock manager */
208 if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0)
209 fatal(errno, "error killing deadlock manager");
210 db_deadlock_pid = -1;
212 D(("deinitialized database environment"));
215 /* open a specific database */
216 static DB *open_db(const char *path,
224 D(("open %s", path));
225 path = config_get_file(path);
226 if((err = db_create(&db, trackdb_env, 0)))
227 fatal(0, "db_create %s: %s", path, db_strerror(err));
229 if((err = db->set_flags(db, dbflags)))
230 fatal(0, "db->set_flags %s: %s", path, db_strerror(err));
231 if(dbtype == DB_BTREE)
232 if((err = db->set_bt_compare(db, compare)))
233 fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err));
234 if((err = db->open(db, 0, path, 0, dbtype,
235 openflags | DB_AUTO_COMMIT, mode)))
236 fatal(0, "db->open %s: %s", path, db_strerror(err));
240 /* open track databases */
241 void trackdb_open(void) {
245 /* open the databases */
246 trackdb_tracksdb = open_db("tracks.db",
247 DB_RECNUM, DB_BTREE, DB_CREATE, 0666);
248 trackdb_searchdb = open_db("search.db",
249 DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
250 trackdb_tagsdb = open_db("tags.db",
251 DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
252 trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666);
253 trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666);
254 trackdb_noticeddb = open_db("noticed.db",
255 DB_DUPSORT, DB_BTREE, DB_CREATE, 0666);
256 D(("opened databases"));
259 /* close track databases */
260 void trackdb_close(void) {
266 if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0)))
267 fatal(0, "error closing tracks.db: %s", db_strerror(err));
268 if((err = trackdb_searchdb->close(trackdb_searchdb, 0)))
269 fatal(0, "error closing search.db: %s", db_strerror(err));
270 if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0)))
271 fatal(0, "error closing tags.db: %s", db_strerror(err));
272 if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0)))
273 fatal(0, "error closing prefs.db: %s", db_strerror(err));
274 if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
275 fatal(0, "error closing global.db: %s", db_strerror(err));
276 if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0)))
277 fatal(0, "error closing noticed.db: %s", db_strerror(err));
278 trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0;
279 trackdb_tagsdb = trackdb_globaldb = 0;
280 D(("closed databases"));
283 /* generic db routines *******************************************************/
285 /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or
286 * DB_LOCK_DEADLOCK. */
287 int trackdb_getdata(DB *db,
294 switch(err = db->get(db, tid, make_key(&key, track),
295 prepare_data(&data), 0)) {
297 *kp = kvp_urldecode(data.data, data.size);
302 case DB_LOCK_DEADLOCK:
303 error(0, "error querying database: %s", db_strerror(err));
306 fatal(0, "error querying database: %s", db_strerror(err));
310 /* encode and store a database entry. Returns 0, DB_KEYEXIST or
311 * DB_LOCK_DEADLOCK. */
312 int trackdb_putdata(DB *db,
320 switch(err = db->put(db, tid, make_key(&key, track),
321 encode_data(&data, k), flags)) {
325 case DB_LOCK_DEADLOCK:
326 error(0, "error updating database: %s", db_strerror(err));
329 fatal(0, "error updating database: %s", db_strerror(err));
333 /* delete a database entry */
334 int trackdb_delkey(DB *db,
340 switch(err = db->del(db, tid, make_key(&key, track), 0)) {
344 case DB_LOCK_DEADLOCK:
345 error(0, "error updating database: %s", db_strerror(err));
348 fatal(0, "error updating database: %s", db_strerror(err));
352 /* open a database cursor */
353 DBC *trackdb_opencursor(DB *db, DB_TXN *tid) {
357 switch(err = db->cursor(db, tid, &c, 0)) {
359 default: fatal(0, "error creating cursor: %s", db_strerror(err));
364 /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */
365 int trackdb_closecursor(DBC *c) {
369 switch(err = c->c_close(c)) {
372 case DB_LOCK_DEADLOCK:
373 error(0, "error closing cursor: %s", db_strerror(err));
376 fatal(0, "error closing cursor: %s", db_strerror(err));
380 /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
381 int trackdb_delkeydata(DB *db,
389 c = trackdb_opencursor(db, tid);
390 switch(err = c->c_get(c, make_key(&key, word),
391 make_key(&data, track), DB_GET_BOTH)) {
393 switch(err = c->c_del(c, 0)) {
399 case DB_LOCK_DEADLOCK:
400 error(0, "error updating database: %s", db_strerror(err));
403 fatal(0, "c->c_del: %s", db_strerror(err));
408 case DB_LOCK_DEADLOCK:
409 error(0, "error updating database: %s", db_strerror(err));
412 fatal(0, "c->c_get: %s", db_strerror(err));
414 if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK;
418 /* start a transaction */
419 DB_TXN *trackdb_begin_transaction(void) {
423 if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0)))
424 fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err));
428 /* abort transaction */
429 void trackdb_abort_transaction(DB_TXN *tid) {
433 if((err = tid->abort(tid)))
434 fatal(0, "tid->abort: %s", db_strerror(err));
437 /* commit transaction */
438 void trackdb_commit_transaction(DB_TXN *tid) {
441 if((err = tid->commit(tid, 0)))
442 fatal(0, "tid->commit: %s", db_strerror(err));
445 /* search/tags shared code ***************************************************/
447 /* comparison function used by dedupe() */
448 static int wordcmp(const void *a, const void *b) {
449 return strcmp(*(const char **)a, *(const char **)b);
452 /* sort and de-dupe VEC */
453 static char **dedupe(char **vec, int nvec) {
456 qsort(vec, nvec, sizeof (char *), wordcmp);
460 for(n = 1; n < nvec; ++n)
461 if(strcmp(vec[n], vec[m - 1]))
468 /* update a key/track database. Returns 0 or DB_DEADLOCK. */
469 static int register_word(DB *db, const char *what,
470 const char *track, const char *word,
475 switch(err = db->put(db, tid, make_key(&key, word),
476 make_key(&data, track), DB_NODUPDATA)) {
480 case DB_LOCK_DEADLOCK:
481 error(0, "error updating %s.db: %s", what, db_strerror(err));
484 fatal(0, "error updating %s.db: %s", what, db_strerror(err));
488 /* search primitives *********************************************************/
490 /* return true iff NAME is a trackname_display_ pref */
491 static int is_display_pref(const char *name) {
492 static const char prefix[] = "trackname_display_";
493 return !strncmp(name, prefix, (sizeof prefix) - 1);
496 /* compute the words of a track name */
497 static char **track_to_words(const char *track,
498 const struct kvp *p) {
502 const char *rootless = track_rootless(track);
505 rootless = track; /* bodge */
507 if((w = words(casefold(strip_extension(rootless)), &nw)))
508 vector_append_many(&v, w, nw);
510 for(; p; p = p->next)
511 if(is_display_pref(p->name))
512 if((w = words(casefold(p->value), &nw)))
513 vector_append_many(&v, w, nw);
514 vector_terminate(&v);
515 return dedupe(v.vec, v.nvec);
518 /* return nonzero iff WORD is a stopword */
519 static int stopword(const char *word) {
522 for(n = 0; n < config->stopword.n
523 && strcmp(word, config->stopword.s[n]); ++n)
525 return n < config->stopword.n;
528 /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */
529 static int register_search_word(const char *track, const char *word,
531 if(stopword(word)) return 0;
532 return register_word(trackdb_searchdb, "search", track, word, tid);
535 /* Tags **********************************************************************/
537 /* Return nonzero if C is a valid tag character */
538 static int tagchar(int c) {
547 /* Parse and de-dupe a tag list. If S=0 then assumes "". */
548 static char **parsetags(const char *s) {
554 /* skip initial separators */
555 while(*s && (!tagchar(*s) || *s == ' '))
558 /* find the extent of the tag */
560 while(*s && tagchar(*s))
562 /* strip trailing spaces */
563 while(s > t && s[-1] == ' ')
565 vector_append(&v, xstrndup(t, s - t));
566 /* skip intermediate and trailing separators */
567 while(*s && (!tagchar(*s) || *s == ' '))
571 vector_terminate(&v);
572 return dedupe(v.vec, v.nvec);
575 /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */
576 static int register_tag(const char *track, const char *tag, DB_TXN *tid) {
577 return register_word(trackdb_tagsdb, "tags", track, tag, tid);
580 /* aliases *******************************************************************/
582 /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If
583 * there is no alias sets *aliasp to 0. */
584 static int compute_alias(char **aliasp,
589 const char *s = config->alias, *t, *expansion, *part;
590 int c, used_db = 0, slash_prefix, err;
592 const char *const root = find_track_root(track);
595 /* Bodge for tracks with no root */
600 dynstr_append_string(&d, root);
601 while((c = (unsigned char)*s++)) {
603 dynstr_append(&d, c);
606 if((slash_prefix = (*s == '/')))
609 assert(t != 0); /* validated at startup */
610 part = xstrndup(s, t - s);
611 expansion = getpart(track, "display", part, p, &used_db);
613 if(slash_prefix) dynstr_append(&d, '/');
614 dynstr_append_string(&d, expansion);
616 s = t + 1; /* skip {part} */
618 /* only admit to the alias if we used the db... */
623 dynstr_terminate(&d);
624 /* ...and the answer differs from the original... */
625 if(!strcmp(track, d.vec)) {
629 /* ...and there isn't already a different track with that name (including as
631 switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) {
633 if((s = kvp_get(at, "_alias_for"))
634 && !strcmp(s, track)) {
646 /* get track and prefs data (if tp/pp not null pointers). Returns 0 on
647 * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK.
648 * Always sets the return values, even if only to null pointers. */
649 static int gettrackdata(const char *track,
652 const char **actualp,
654 #define GTD_NOALIAS 0x0001
657 const char *actual = track;
658 struct kvp *t = 0, *p = 0;
660 if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done;
661 if((actual = kvp_get(t, "_alias_for"))) {
662 if(flags & GTD_NOALIAS) {
663 error(0, "alias passed to gettrackdata where real path required");
666 if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done;
671 if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK)
676 if(actualp) *actualp = actual;
682 /* trackdb_notice() **********************************************************/
684 /** @brief notice a possibly new track
685 * @return @c DB_NOTFOUND if new, 0 if already known
687 int trackdb_notice(const char *track,
693 tid = trackdb_begin_transaction();
694 err = trackdb_notice_tid(track, path, tid);
695 if((err == DB_LOCK_DEADLOCK)) goto fail;
698 trackdb_abort_transaction(tid);
700 trackdb_commit_transaction(tid);
704 /** @brief notice a possibly new track
705 * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also
707 int trackdb_notice_tid(const char *track,
711 struct kvp *t, *a, *p;
715 /* notice whether the tracks.db entry changes */
717 /* get any existing tracks entry */
718 if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK)
720 ret = err; /* 0 or DB_NOTFOUND */
721 /* this is a real track */
722 t_changed += kvp_set(&t, "_alias_for", 0);
723 t_changed += kvp_set(&t, "_path", path);
724 /* if we have an alias record it in the database */
725 if((err = compute_alias(&alias, track, p, tid))) return err;
727 /* won't overwrite someone else's alias as compute_alias() checks */
728 D(("%s: alias %s", track, alias));
730 kvp_set(&a, "_alias_for", track);
731 if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err;
733 /* update search.db */
734 w = track_to_words(track, p);
735 for(n = 0; w[n]; ++n)
736 if((err = register_search_word(track, w[n], tid)))
739 w = parsetags(kvp_get(p, "tags"));
740 for(n = 0; w[n]; ++n)
741 if((err = register_tag(track, w[n], tid)))
744 /* only store the tracks.db entry if it has changed */
745 if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)))
747 if(ret == DB_NOTFOUND) {
748 uint32_t timestamp[2];
753 timestamp[0] = htonl((uint64_t)now >> 32);
754 timestamp[1] = htonl((uint32_t)now);
755 memset(&key, 0, sizeof key);
756 key.data = timestamp;
757 key.size = sizeof timestamp;
758 switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key,
759 make_key(&data, track), 0)) {
761 case DB_LOCK_DEADLOCK: return err;
762 default: fatal(0, "error updating noticed.db: %s", db_strerror(err));
768 /* trackdb_obsolete() ********************************************************/
770 /* obsolete a track */
771 int trackdb_obsolete(const char *track, DB_TXN *tid) {
776 if((err = gettrackdata(track, 0, &p, 0,
777 GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK)
779 else if(err == DB_NOTFOUND) return 0;
780 /* compute the alias, if any, and delete it */
781 if(compute_alias(&alias, track, p, tid)) return err;
783 /* if the alias points to some other track then compute_alias won't
785 if(trackdb_delkey(trackdb_tracksdb, alias, tid))
788 /* update search.db */
789 w = track_to_words(track, p);
790 for(n = 0; w[n]; ++n)
791 if(trackdb_delkeydata(trackdb_searchdb,
792 w[n], track, tid) == DB_LOCK_DEADLOCK)
795 w = parsetags(kvp_get(p, "tags"));
796 for(n = 0; w[n]; ++n)
797 if(trackdb_delkeydata(trackdb_tagsdb,
798 w[n], track, tid) == DB_LOCK_DEADLOCK)
801 /* update tracks.db */
802 if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK)
804 /* We don't delete the prefs, so they survive temporary outages of the
805 * (possibly virtual) track filesystem */
809 /* trackdb_stats() ***********************************************************/
811 #define H(name) { #name, offsetof(DB_HASH_STAT, name) }
812 #define B(name) { #name, offsetof(DB_BTREE_STAT, name) }
814 static const struct statinfo {
817 } statinfo_hash[] = {
833 }, statinfo_btree[] = {
854 /* look up stats for DB */
855 static int get_stats(struct vector *v,
857 const struct statinfo *si,
866 switch(err = database->stat(database, tid, &sp, 0)) {
869 case DB_LOCK_DEADLOCK:
870 error(0, "error querying database: %s", db_strerror(err));
873 fatal(0, "error querying database: %s", db_strerror(err));
875 for(n = 0; n < nsi; ++n) {
876 byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name,
877 (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset));
878 vector_append(v, str);
884 struct search_entry {
889 /* find the top COUNT words in the search database */
890 static int search_league(struct vector *v, int count, DB_TXN *tid) {
891 struct search_entry *se;
894 int err, n = 0, nse = 0, i;
899 cursor = trackdb_opencursor(trackdb_searchdb, tid);
900 se = xmalloc(count * sizeof *se);
901 while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
903 if(word && wl == k.size && !strncmp(word, k.data, wl))
906 #define FINALIZE() do { \
907 if(word && (nse < count || n > se[nse - 1].n)) { \
912 while(i > 0 && n > se[i - 1].n) \
914 memmove(&se[i + 1], &se[i], (nse - i) * sizeof *se); \
920 word = xstrndup(k.data, wl = k.size);
928 case DB_LOCK_DEADLOCK:
929 error(0, "error querying search database: %s", db_strerror(err));
932 fatal(0, "error querying search database: %s", db_strerror(err));
934 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
937 byte_xasprintf(&str, "Top %d search words:", nse);
938 vector_append(v, str);
939 for(i = 0; i < nse; ++i) {
940 byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word);
941 vector_append(v, str);
946 #define SI(what) statinfo_##what, \
947 sizeof statinfo_##what / sizeof (struct statinfo)
949 /* return a list of database stats */
950 char **trackdb_stats(int *nstatsp) {
956 tid = trackdb_begin_transaction();
958 vector_append(&v, (char *)"Tracks database stats:");
959 if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail;
960 vector_append(&v, (char *)"");
961 vector_append(&v, (char *)"Search database stats:");
962 if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail;
963 vector_append(&v, (char *)"");
964 vector_append(&v, (char *)"Prefs database stats:");
965 if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail;
966 vector_append(&v, (char *)"");
967 if(search_league(&v, 10, tid)) goto fail;
968 vector_terminate(&v);
971 trackdb_abort_transaction(tid);
973 trackdb_commit_transaction(tid);
974 if(nstatsp) *nstatsp = v.nvec;
978 struct stats_details {
979 void (*done)(char *data, void *u);
981 int exited; /* subprocess exited */
982 int closed; /* pipe close */
983 int wstat; /* wait status from subprocess */
984 struct dynstr data[1]; /* data read from pipe */
987 static void stats_complete(struct stats_details *d) {
990 if(!(d->exited && d->closed))
992 byte_xasprintf(&s, "\n"
994 "track lookup cache hits: %lu\n"
995 "track lookup cache misses: %lu\n",
998 dynstr_append_string(d->data, s);
999 dynstr_terminate(d->data);
1000 d->done(d->data->vec, d->u);
1003 static int stats_finished(ev_source attribute((unused)) *ev,
1004 pid_t attribute((unused)) pid,
1006 const struct rusage attribute((unused)) *rusage,
1008 struct stats_details *const d = u;
1012 error(0, "disorder-stats %s", wstat(status));
1017 static int stats_read(ev_source attribute((unused)) *ev,
1023 struct stats_details *const d = u;
1025 dynstr_append_bytes(d->data, ptr, bytes);
1026 ev_reader_consume(reader, bytes);
1033 static int stats_error(ev_source attribute((unused)) *ev,
1036 struct stats_details *const d = u;
1038 error(errno_value, "error reading from pipe to disorder-stats");
1044 void trackdb_stats_subprocess(ev_source *ev,
1045 void (*done)(char *data, void *u),
1049 struct stats_details *d = xmalloc(sizeof *d);
1051 dynstr_init(d->data);
1055 pid = subprogram(ev, "disorder-stats", p[1]);
1057 ev_child(ev, pid, 0, stats_finished, d);
1058 ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader");
1061 /* set a pref (remove if value=0) */
1062 int trackdb_set(const char *track,
1064 const char *value) {
1065 struct kvp *t, *p, *a;
1068 char *oldalias, *newalias, **oldtags = 0, **newtags;
1071 /* TODO: if value matches default then set value=0 */
1075 tid = trackdb_begin_transaction();
1076 if((err = gettrackdata(track, &t, &p, 0,
1077 0, tid)) == DB_LOCK_DEADLOCK)
1079 if(err == DB_NOTFOUND) break;
1080 if(name[0] == '_') {
1081 if(kvp_set(&t, name, value))
1082 if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))
1085 /* get the old alias name */
1086 if(compute_alias(&oldalias, track, p, tid)) goto fail;
1087 /* get the old tags */
1088 if(!strcmp(name, "tags"))
1089 oldtags = parsetags(kvp_get(p, "tags"));
1091 if(kvp_set(&p, name, value))
1092 if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0))
1094 /* compute the new alias name */
1095 if((err = compute_alias(&newalias, track, p, tid))) goto fail;
1096 /* check whether alias has changed */
1097 if(!(oldalias == newalias
1098 || (oldalias && newalias && !strcmp(oldalias, newalias)))) {
1099 /* adjust alias records to fit change */
1101 && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail;
1104 kvp_set(&a, "_alias_for", track);
1105 if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail;
1108 /* check whether tags have changed */
1109 if(!strcmp(name, "tags")) {
1110 newtags = parsetags(value);
1111 while(*oldtags || *newtags) {
1112 if(*oldtags && *newtags) {
1113 cmp = strcmp(*oldtags, *newtags);
1115 /* keeping this tag */
1119 /* old tag fits into a gap in the new list, so delete old */
1122 /* new tag fits into a gap in the old list, so insert new */
1124 } else if(*oldtags) {
1125 /* we've run out of new tags, so remaining old ones are to be
1128 if(trackdb_delkeydata(trackdb_tagsdb,
1129 *oldtags, track, tid) == DB_LOCK_DEADLOCK)
1133 /* we've run out of old tags, so remainig new ones are to be
1136 if(register_tag(track, *newtags, tid)) goto fail;
1146 trackdb_abort_transaction(tid);
1148 trackdb_commit_transaction(tid);
1149 return err == 0 ? 0 : -1;
1153 const char *trackdb_get(const char *track,
1155 return kvp_get(trackdb_get_all(track), name);
1158 /* get all prefs as a 0-terminated array */
1159 struct kvp *trackdb_get_all(const char *track) {
1160 struct kvp *t, *p, **pp;
1164 tid = trackdb_begin_transaction();
1165 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1169 trackdb_abort_transaction(tid);
1171 trackdb_commit_transaction(tid);
1172 for(pp = &p; *pp; pp = &(*pp)->next)
1179 const char *trackdb_resolve(const char *track) {
1184 tid = trackdb_begin_transaction();
1185 if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK)
1189 trackdb_abort_transaction(tid);
1191 trackdb_commit_transaction(tid);
1195 int trackdb_isalias(const char *track) {
1196 const char *actual = trackdb_resolve(track);
1198 return strcmp(actual, track);
1201 /* test whether a track exists (perhaps an alias) */
1202 int trackdb_exists(const char *track) {
1207 tid = trackdb_begin_transaction();
1208 /* unusually, here we want the return value */
1209 if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK)
1213 trackdb_abort_transaction(tid);
1215 trackdb_commit_transaction(tid);
1219 /* return the list of tags */
1220 char **trackdb_alltags(void) {
1226 tid = trackdb_begin_transaction();
1227 err = trackdb_alltags_tid(tid, &taglist);
1229 trackdb_abort_transaction(tid);
1231 trackdb_commit_transaction(tid);
1235 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) {
1242 c = trackdb_opencursor(trackdb_tagsdb, tid);
1243 memset(&k, 0, sizeof k);
1244 while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP)))
1245 vector_append(&v, xstrndup(k.data, k.size));
1249 case DB_LOCK_DEADLOCK:
1252 fatal(0, "c->c_get: %s", db_strerror(err));
1254 if((err = trackdb_closecursor(c))) return err;
1255 vector_terminate(&v);
1260 /* return 1 iff sorted tag lists A and B have at least one member in common */
1261 static int tag_intersection(char **a, char **b) {
1264 /* Same sort of logic as trackdb_set() above */
1266 if(!(cmp = strcmp(*a, *b))) return 1;
1267 else if(cmp < 0) ++a;
1273 /* Check whether a track is suitable for random play. Returns 0 if it is,
1274 * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us
1276 static int check_suitable(const char *track,
1278 char **required_tags,
1279 char **prohibited_tags) {
1283 const char *pick_at_random, *played_time;
1285 /* don't pick tracks that aren't in any surviving collection (for instance
1286 * you've edited the config but the rescan hasn't done its job yet) */
1287 if(!find_track_root(track)) {
1288 info("found track not in any collection: %s", track);
1291 /* don't pick aliases - only pick the canonical form */
1292 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1293 return DB_LOCK_DEADLOCK;
1294 if(kvp_get(t, "_alias_for"))
1296 /* check that random play is not suppressed for this track */
1297 if((pick_at_random = kvp_get(p, "pick_at_random"))
1298 && !strcmp(pick_at_random, "0"))
1300 /* don't pick a track that's been played in the last 8 hours */
1301 if((played_time = kvp_get(p, "played_time"))) {
1302 last = atoll(played_time);
1304 if(now < last + 8 * 3600) /* TODO configurable */
1307 track_tags = parsetags(kvp_get(p, "tags"));
1308 /* check that no prohibited tag is present for this track */
1309 if(prohibited_tags && tag_intersection(track_tags, prohibited_tags))
1311 /* check that at least one required tags is present for this track */
1312 if(*required_tags && !tag_intersection(track_tags, required_tags))
1317 /* attempt to pick a random non-alias track */
1318 const char *trackdb_random(int tries) {
1323 const char *track, *candidate;
1326 char **required_tags, **prohibited_tags, **tp;
1331 tid = trackdb_begin_transaction();
1332 if((err = trackdb_get_global_tid("required-tags", tid, &tags)))
1334 required_tags = parsetags(tags);
1335 if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags)))
1337 prohibited_tags = parsetags(tags);
1339 if(*required_tags) {
1340 /* Bung all the suitable tracks into a hash and convert to a list of keys
1341 * (to eliminate duplicates). We cache this list since it is possible
1342 * that it will be very large. */
1345 for(tp = required_tags; *tp; ++tp) {
1346 c = trackdb_opencursor(trackdb_tagsdb, tid);
1347 memset(&key, 0, sizeof key);
1349 key.size = strlen(*tp);
1351 err = c->c_get(c, &key, prepare_data(&data), DB_SET);
1353 hash_add(h, xstrndup(data.data, data.size), 0,
1354 HASH_INSERT_OR_REPLACE);
1356 err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP);
1362 case DB_LOCK_DEADLOCK:
1365 fatal(0, "error querying tags.db: %s", db_strerror(err));
1367 trackdb_closecursor(c);
1370 error(0, "required tag %s does not match any tracks", *tp);
1372 nreqtracks = hash_count(h);
1373 reqtracks = hash_keys(h);
1375 while(nreqtracks && !track && tries-- > 0) {
1376 r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0));
1377 candidate = reqtracks[r];
1378 switch(check_suitable(candidate, tid,
1379 required_tags, prohibited_tags)) {
1385 case DB_LOCK_DEADLOCK:
1390 /* No required tags. We pick random record numbers in the database
1392 switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) {
1395 case DB_LOCK_DEADLOCK:
1396 error(0, "error querying tracks.db: %s", db_strerror(err));
1399 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1402 error(0, "cannot pick tracks at random from an empty database");
1403 while(sp->bt_nkeys && !track && tries-- > 0) {
1404 /* record numbers count from 1 upwards */
1405 r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0));
1406 memset(&key, sizeof key, 0);
1407 key.flags = DB_DBT_MALLOC;
1408 key.size = sizeof r;
1410 switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data),
1414 case DB_LOCK_DEADLOCK:
1415 error(0, "error querying tracks.db: %s", db_strerror(err));
1418 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1420 candidate = xstrndup(key.data, key.size);
1421 switch(check_suitable(candidate, tid,
1422 required_tags, prohibited_tags)) {
1428 case DB_LOCK_DEADLOCK:
1435 trackdb_closecursor(c);
1437 trackdb_abort_transaction(tid);
1439 trackdb_commit_transaction(tid);
1441 error(0, "could not pick a random track");
1445 /* get a track name given the prefs. Set *used_db to 1 if we got the answer
1446 * from the prefs. */
1447 static const char *getpart(const char *track,
1448 const char *context,
1450 const struct kvp *p,
1455 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1456 if((result = kvp_get(p, pref)))
1459 result = trackname_part(track, context, part);
1460 assert(result != 0);
1464 /* get a track name part, like trackname_part(), but taking the database into
1466 const char *trackdb_getpart(const char *track,
1467 const char *context,
1475 /* construct the full pref */
1476 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1478 tid = trackdb_begin_transaction();
1479 if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK)
1483 trackdb_abort_transaction(tid);
1485 trackdb_commit_transaction(tid);
1486 return getpart(actual, context, part, p, &used_db);
1489 /* get the raw path name for @track@ (might be an alias) */
1490 const char *trackdb_rawpath(const char *track) {
1496 tid = trackdb_begin_transaction();
1497 if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK)
1501 trackdb_abort_transaction(tid);
1503 trackdb_commit_transaction(tid);
1504 if(!(path = kvp_get(t, "_path"))) path = track;
1508 /* trackdb_list **************************************************************/
1510 /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually
1511 * readable at some point */
1513 /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE.
1514 * If RE is a null pointer then it matches everything. */
1515 static int track_matches(size_t dl, const char *track, size_t tl,
1523 switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) {
1524 case PCRE_ERROR_NOMATCH: return 0;
1527 error(0, "pcre_exec returned %d, subject '%s'", rc, track);
1534 static int do_list(struct vector *v, const char *dir,
1535 enum trackdb_listable what, const pcre *re, DB_TXN *tid) {
1541 size_t l, last_dir_len = 0;
1542 char *last_dir = 0, *track, *alias;
1546 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1549 /* find the first key >= dir */
1550 err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE);
1551 /* keep going while we're dealing with <dir/anything> */
1554 && ((char *)k.data)[dl] == '/'
1555 && !memcmp(k.data, dir, dl)) {
1556 ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1));
1558 /* we have <dir/component/anything>, so <dir/component> is a directory */
1559 l = ptr - (char *)k.data;
1560 if(what & trackdb_directories)
1562 && l == last_dir_len
1563 && !memcmp(last_dir, k.data, l))) {
1564 last_dir = xstrndup(k.data, last_dir_len = l);
1565 if(track_matches(dl, k.data, l, re))
1566 vector_append(v, last_dir);
1569 /* found a plain file */
1570 if((what & trackdb_files)) {
1571 track = xstrndup(k.data, k.size);
1572 if((err = trackdb_getdata(trackdb_prefsdb,
1573 track, &p, tid)) == DB_LOCK_DEADLOCK)
1575 /* if this file has an alias in the same directory then we skip it */
1576 if((err = compute_alias(&alias, track, p, tid)))
1578 if(!(alias && !strcmp(d_dirname(alias), d_dirname(track))))
1579 if(track_matches(dl, k.data, k.size, re))
1580 vector_append(v, track);
1583 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1591 case DB_LOCK_DEADLOCK:
1592 error(0, "error querying database: %s", db_strerror(err));
1595 fatal(0, "error querying database: %s", db_strerror(err));
1598 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1602 /* return the directories or files below @dir@ */
1603 char **trackdb_list(const char *dir, int *np, enum trackdb_listable what,
1611 tid = trackdb_begin_transaction();
1614 if(do_list(&v, dir, what, re, tid))
1617 for(n = 0; n < config->collection.n; ++n)
1618 if(do_list(&v, config->collection.s[n].root, what, re, tid))
1623 trackdb_abort_transaction(tid);
1625 trackdb_commit_transaction(tid);
1626 vector_terminate(&v);
1632 /* If S is tag:something, return something. Else return 0. */
1633 static const char *checktag(const char *s) {
1634 if(!strncmp(s, "tag:", 4))
1640 /* return a list of tracks containing all of the words given. If you
1641 * ask for only stopwords you get no tracks. */
1642 char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) {
1643 const char **w, *best = 0, *tag;
1644 char **twords, **tags;
1645 int i, j, n, err, what;
1655 *ntracks = 0; /* for early returns */
1656 /* casefold all the words */
1657 w = xmalloc(nwordlist * sizeof (char *));
1658 for(n = 0; n < nwordlist; ++n) {
1659 w[n] = casefold(wordlist[n]);
1660 if(checktag(w[n])) ++ntags; /* count up tags */
1662 /* find the longest non-stopword */
1663 for(n = 0; n < nwordlist; ++n)
1664 if(!stopword(w[n]) && !checktag(w[n]))
1665 if(!best || strlen(w[n]) > strlen(best))
1667 /* TODO: we should at least in principal be able to identify the word or tag
1668 * with the least matches in log time, and choose that as our primary search
1670 if(ntags && !best) {
1671 /* Only tags are listed. We limit to the first and narrow down with the
1673 best = checktag(w[0]);
1674 db = trackdb_tagsdb;
1677 /* We can limit to some word. */
1678 db = trackdb_searchdb;
1681 /* Only stopwords */
1687 tid = trackdb_begin_transaction();
1688 /* find all the tracks that have that word */
1693 cursor = trackdb_opencursor(db, tid);
1694 while(!(err = cursor->c_get(cursor, &k, &d, what))) {
1695 vector_append(&v, xstrndup(d.data, d.size));
1702 case DB_LOCK_DEADLOCK:
1703 error(0, "error querying %s database: %s", dbname, db_strerror(err));
1706 fatal(0, "error querying %s database: %s", dbname, db_strerror(err));
1708 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1710 /* do a naive search over that (hopefuly fairly small) list of tracks */
1712 for(n = 0; n < v.nvec; ++n) {
1713 if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK))
1716 error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err));
1719 twords = track_to_words(v.vec[n], p);
1720 tags = parsetags(kvp_get(p, "tags"));
1721 for(i = 0; i < nwordlist; ++i) {
1722 if((tag = checktag(w[i]))) {
1723 /* Track must have this tag */
1724 for(j = 0; tags[j]; ++j)
1725 if(!strcmp(tag, tags[j])) break; /* tag found */
1726 if(!tags[j]) break; /* tag not found */
1728 /* Track must contain this word */
1729 for(j = 0; twords[j]; ++j)
1730 if(!strcmp(w[i], twords[j])) break; /* word found */
1731 if(!twords[j]) break; /* word not found */
1734 if(i >= nwordlist) /* all words found */
1735 vector_append(&u, v.vec[n]);
1739 trackdb_closecursor(cursor);
1741 trackdb_abort_transaction(tid);
1742 info("retrying search");
1744 trackdb_commit_transaction(tid);
1745 vector_terminate(&u);
1751 /* trackdb_scan **************************************************************/
1753 int trackdb_scan(const char *root,
1754 int (*callback)(const char *track,
1762 const size_t root_len = root ? strlen(root) : 0;
1767 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1769 err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d),
1772 memset(&k, 0, sizeof k);
1773 err = cursor->c_get(cursor, &k, prepare_data(&d),
1778 || (k.size > root_len
1779 && !strncmp(k.data, root, root_len)
1780 && ((char *)k.data)[root_len] == '/')) {
1781 data = kvp_urldecode(d.data, d.size);
1782 if(kvp_get(data, "_path")) {
1783 track = xstrndup(k.data, k.size);
1784 /* Advance to the next track before the callback so that the callback
1785 * may safely delete the track */
1786 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1787 if((cberr = callback(track, data, u, tid))) {
1792 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1796 trackdb_closecursor(cursor);
1803 case DB_LOCK_DEADLOCK:
1804 error(0, "c->c_get: %s", db_strerror(err));
1807 fatal(0, "c->c_get: %s", db_strerror(err));
1811 /* trackdb_rescan ************************************************************/
1813 /* called when the rescanner terminates */
1814 static int reap_rescan(ev_source attribute((unused)) *ev,
1817 const struct rusage attribute((unused)) *rusage,
1818 void attribute((unused)) *u) {
1819 if(pid == rescan_pid) rescan_pid = -1;
1821 error(0, RESCAN": %s", wstat(status));
1823 D((RESCAN" terminated: %s", wstat(status)));
1824 /* Our cache of file lookups is out of date now */
1825 cache_clean(&cache_files_type);
1826 eventlog("rescanned", (char *)0);
1830 void trackdb_rescan(ev_source *ev) {
1833 if(rescan_pid != -1) {
1834 error(0, "rescan already underway");
1837 rescan_pid = subprogram(ev, RESCAN, -1);
1839 ev_child(ev, rescan_pid, 0, reap_rescan, 0);
1840 D(("started rescanner"));
1842 /* This is the first rescan, we block until it is complete */
1843 while(waitpid(rescan_pid, &w, 0) < 0 && errno == EINTR)
1845 reap_rescan(0, rescan_pid, w, 0, 0);
1849 int trackdb_rescan_cancel(void) {
1850 if(rescan_pid == -1) return 0;
1851 if(kill(rescan_pid, SIGTERM) < 0)
1852 fatal(errno, "error killing rescanner");
1857 /* global prefs **************************************************************/
1859 void trackdb_set_global(const char *name,
1867 memset(&k, 0, sizeof k);
1868 memset(&d, 0, sizeof d);
1869 k.data = (void *)name;
1870 k.size = strlen(name);
1872 d.data = (void *)value;
1873 d.size = strlen(value);
1876 tid = trackdb_begin_transaction();
1878 err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0);
1880 err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0);
1881 if(!err || err == DB_NOTFOUND) break;
1882 if(err != DB_LOCK_DEADLOCK)
1883 fatal(0, "error updating database: %s", db_strerror(err));
1884 trackdb_abort_transaction(tid);
1886 trackdb_commit_transaction(tid);
1887 /* log important state changes */
1888 if(!strcmp(name, "playing")) {
1889 state = !value || !strcmp(value, "yes");
1890 info("playing %s by %s",
1891 state ? "enabled" : "disabled",
1893 eventlog("state", state ? "enable_play" : "disable_play", (char *)0);
1895 if(!strcmp(name, "random-play")) {
1896 state = !value || !strcmp(value, "yes");
1897 info("random play %s by %s",
1898 state ? "enabled" : "disabled",
1900 eventlog("state", state ? "enable_random" : "disable_random", (char *)0);
1902 if(!strcmp(name, "required-tags"))
1906 const char *trackdb_get_global(const char *name) {
1912 tid = trackdb_begin_transaction();
1913 if(!(err = trackdb_get_global_tid(name, tid, &r)))
1915 trackdb_abort_transaction(tid);
1917 trackdb_commit_transaction(tid);
1921 static int trackdb_get_global_tid(const char *name,
1927 memset(&k, 0, sizeof k);
1928 k.data = (void *)name;
1929 k.size = strlen(name);
1930 switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k,
1931 prepare_data(&d), 0)) {
1933 *rp = xstrndup(d.data, d.size);
1938 case DB_LOCK_DEADLOCK:
1941 fatal(0, "error updating database: %s", db_strerror(err));
1945 /** @brief Retrieve the most recently added tracks
1946 * @param ntracksp Where to put count, or 0
1947 * @param maxtracks Maximum number of tracks to retrieve
1948 * @return null-terminated array of track names
1950 * The most recently added track is first in the array.
1952 char **trackdb_new(int *ntracksp,
1958 tid = trackdb_begin_transaction();
1959 tracks = trackdb_new_tid(ntracksp, maxtracks, tid);
1962 trackdb_abort_transaction(tid);
1964 trackdb_commit_transaction(tid);
1968 /** @brief Retrieve the most recently added tracks
1969 * @param ntracksp Where to put count, or 0
1970 * @param maxtracks Maximum number of tracks to retrieve, or 0 for all
1971 * @param tid Transaction ID
1972 * @return null-terminated array of track names, or NULL on deadlock
1974 * The most recently added track is first in the array.
1976 static char **trackdb_new_tid(int *ntracksp,
1982 struct vector tracks[1];
1984 vector_init(tracks);
1985 c = trackdb_opencursor(trackdb_noticeddb, tid);
1986 while((maxtracks <= 0 || tracks->nvec < maxtracks)
1987 && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV)))
1988 vector_append(tracks, xstrndup(d.data, d.size));
1990 case 0: /* hit maxtracks */
1991 case DB_NOTFOUND: /* ran out of tracks */
1993 case DB_LOCK_DEADLOCK:
1994 trackdb_closecursor(c);
1997 fatal(0, "error reading noticed.db: %s", db_strerror(err));
1999 if((err = trackdb_closecursor(c)))
2000 return 0; /* deadlock */
2001 vector_terminate(tracks);
2003 *ntracksp = tracks->nvec;
2007 /** @brief Expire noticed.db
2008 * @param earliest Earliest timestamp to keep
2010 void trackdb_expire_noticed(time_t earliest) {
2014 tid = trackdb_begin_transaction();
2015 if(!trackdb_expire_noticed_tid(earliest, tid))
2017 trackdb_abort_transaction(tid);
2019 trackdb_commit_transaction(tid);
2022 /** @brief Expire noticed.db
2023 * @param earliest Earliest timestamp to keep
2024 * @param tid Transaction ID
2025 * @return 0 or DB_LOCK_DEADLOCK
2027 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) {
2035 c = trackdb_opencursor(trackdb_noticeddb, tid);
2036 while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) {
2038 when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1]));
2039 if(when >= earliest)
2041 if((err = c->c_del(c, 0))) {
2042 if(err != DB_LOCK_DEADLOCK)
2043 fatal(0, "error deleting expired noticed.db entry: %s",
2049 if(err == DB_NOTFOUND)
2051 if(err && err != DB_LOCK_DEADLOCK)
2052 fatal(0, "error expiring noticed.db: %s", db_strerror(err));
2054 if((err = trackdb_closecursor(c))) {
2055 if(err != DB_LOCK_DEADLOCK)
2056 fatal(0, "error closing cursor: %s", db_strerror(err));
2060 info("expired %d tracks from noticed.db", count);
2064 /* tidying up ****************************************************************/
2066 void trackdb_gc(void) {
2070 if((err = trackdb_env->txn_checkpoint(trackdb_env,
2071 config->checkpoint_kbyte,
2072 config->checkpoint_min,
2074 fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err));
2075 if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE)))
2076 fatal(0, "trackdb_env->log_archive: %s", db_strerror(err));
2077 /* This makes catastrophic recovery impossible. However, the user can still
2078 * preserve the important data by using disorder-dump to snapshot their
2079 * prefs, and later to restore it. This is likely to have much small
2080 * long-term storage requirements than record the db logfiles. */
2088 indent-tabs-mode:nil