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())) {
165 ev_signal_atfork(ev);
166 signal(SIGPIPE, SIG_DFL);
171 /* If we were negatively niced, undo it. We don't bother checking for
172 * error, it's not that important. */
173 setpriority(PRIO_PROCESS, 0, 0);
174 execlp(prog, prog, "--config", configfile,
175 debugging ? "--debug" : "--no-debug",
176 log_default == &log_syslog ? "--syslog" : "--no-syslog",
178 fatal(errno, "error invoking %s", prog);
183 /* start deadlock manager */
184 void trackdb_master(ev_source *ev) {
185 assert(db_deadlock_pid == -1);
186 db_deadlock_pid = subprogram(ev, DEADLOCK, -1);
187 ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0);
188 D(("started deadlock manager"));
191 /* close environment */
192 void trackdb_deinit(void) {
196 assert(initialized == 1);
199 /* close the environment */
200 if((err = trackdb_env->close(trackdb_env, 0)))
201 fatal(0, "trackdb_env->close: %s", db_strerror(err));
203 if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0)
204 fatal(errno, "error killing rescanner");
206 /* terminate the deadlock manager */
207 if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0)
208 fatal(errno, "error killing deadlock manager");
209 db_deadlock_pid = -1;
211 D(("deinitialized database environment"));
214 /* open a specific database */
215 static DB *open_db(const char *path,
223 D(("open %s", path));
224 path = config_get_file(path);
225 if((err = db_create(&db, trackdb_env, 0)))
226 fatal(0, "db_create %s: %s", path, db_strerror(err));
228 if((err = db->set_flags(db, dbflags)))
229 fatal(0, "db->set_flags %s: %s", path, db_strerror(err));
230 if(dbtype == DB_BTREE)
231 if((err = db->set_bt_compare(db, compare)))
232 fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err));
233 if((err = db->open(db, 0, path, 0, dbtype,
234 openflags | DB_AUTO_COMMIT, mode)))
235 fatal(0, "db->open %s: %s", path, db_strerror(err));
239 /* open track databases */
240 void trackdb_open(void) {
244 /* open the databases */
245 trackdb_tracksdb = open_db("tracks.db",
246 DB_RECNUM, DB_BTREE, DB_CREATE, 0666);
247 trackdb_searchdb = open_db("search.db",
248 DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
249 trackdb_tagsdb = open_db("tags.db",
250 DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
251 trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666);
252 trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666);
253 trackdb_noticeddb = open_db("noticed.db",
254 DB_DUPSORT, DB_BTREE, DB_CREATE, 0666);
255 D(("opened databases"));
258 /* close track databases */
259 void trackdb_close(void) {
265 if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0)))
266 fatal(0, "error closing tracks.db: %s", db_strerror(err));
267 if((err = trackdb_searchdb->close(trackdb_searchdb, 0)))
268 fatal(0, "error closing search.db: %s", db_strerror(err));
269 if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0)))
270 fatal(0, "error closing tags.db: %s", db_strerror(err));
271 if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0)))
272 fatal(0, "error closing prefs.db: %s", db_strerror(err));
273 if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
274 fatal(0, "error closing global.db: %s", db_strerror(err));
275 if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0)))
276 fatal(0, "error closing noticed.db: %s", db_strerror(err));
277 trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0;
278 trackdb_tagsdb = trackdb_globaldb = 0;
279 D(("closed databases"));
282 /* generic db routines *******************************************************/
284 /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or
285 * DB_LOCK_DEADLOCK. */
286 int trackdb_getdata(DB *db,
293 switch(err = db->get(db, tid, make_key(&key, track),
294 prepare_data(&data), 0)) {
296 *kp = kvp_urldecode(data.data, data.size);
301 case DB_LOCK_DEADLOCK:
302 error(0, "error querying database: %s", db_strerror(err));
305 fatal(0, "error querying database: %s", db_strerror(err));
309 /* encode and store a database entry. Returns 0, DB_KEYEXIST or
310 * DB_LOCK_DEADLOCK. */
311 int trackdb_putdata(DB *db,
319 switch(err = db->put(db, tid, make_key(&key, track),
320 encode_data(&data, k), flags)) {
324 case DB_LOCK_DEADLOCK:
325 error(0, "error updating database: %s", db_strerror(err));
328 fatal(0, "error updating database: %s", db_strerror(err));
332 /* delete a database entry */
333 int trackdb_delkey(DB *db,
339 switch(err = db->del(db, tid, make_key(&key, track), 0)) {
343 case DB_LOCK_DEADLOCK:
344 error(0, "error updating database: %s", db_strerror(err));
347 fatal(0, "error updating database: %s", db_strerror(err));
351 /* open a database cursor */
352 DBC *trackdb_opencursor(DB *db, DB_TXN *tid) {
356 switch(err = db->cursor(db, tid, &c, 0)) {
358 default: fatal(0, "error creating cursor: %s", db_strerror(err));
363 /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */
364 int trackdb_closecursor(DBC *c) {
368 switch(err = c->c_close(c)) {
371 case DB_LOCK_DEADLOCK:
372 error(0, "error closing cursor: %s", db_strerror(err));
375 fatal(0, "error closing cursor: %s", db_strerror(err));
379 /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
380 int trackdb_delkeydata(DB *db,
388 c = trackdb_opencursor(db, tid);
389 switch(err = c->c_get(c, make_key(&key, word),
390 make_key(&data, track), DB_GET_BOTH)) {
392 switch(err = c->c_del(c, 0)) {
398 case DB_LOCK_DEADLOCK:
399 error(0, "error updating database: %s", db_strerror(err));
402 fatal(0, "c->c_del: %s", db_strerror(err));
407 case DB_LOCK_DEADLOCK:
408 error(0, "error updating database: %s", db_strerror(err));
411 fatal(0, "c->c_get: %s", db_strerror(err));
413 if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK;
417 /* start a transaction */
418 DB_TXN *trackdb_begin_transaction(void) {
422 if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0)))
423 fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err));
427 /* abort transaction */
428 void trackdb_abort_transaction(DB_TXN *tid) {
432 if((err = tid->abort(tid)))
433 fatal(0, "tid->abort: %s", db_strerror(err));
436 /* commit transaction */
437 void trackdb_commit_transaction(DB_TXN *tid) {
440 if((err = tid->commit(tid, 0)))
441 fatal(0, "tid->commit: %s", db_strerror(err));
444 /* search/tags shared code ***************************************************/
446 /* comparison function used by dedupe() */
447 static int wordcmp(const void *a, const void *b) {
448 return strcmp(*(const char **)a, *(const char **)b);
451 /* sort and de-dupe VEC */
452 static char **dedupe(char **vec, int nvec) {
455 qsort(vec, nvec, sizeof (char *), wordcmp);
459 for(n = 1; n < nvec; ++n)
460 if(strcmp(vec[n], vec[m - 1]))
467 /* update a key/track database. Returns 0 or DB_DEADLOCK. */
468 static int register_word(DB *db, const char *what,
469 const char *track, const char *word,
474 switch(err = db->put(db, tid, make_key(&key, word),
475 make_key(&data, track), DB_NODUPDATA)) {
479 case DB_LOCK_DEADLOCK:
480 error(0, "error updating %s.db: %s", what, db_strerror(err));
483 fatal(0, "error updating %s.db: %s", what, db_strerror(err));
487 /* search primitives *********************************************************/
489 /* return true iff NAME is a trackname_display_ pref */
490 static int is_display_pref(const char *name) {
491 static const char prefix[] = "trackname_display_";
492 return !strncmp(name, prefix, (sizeof prefix) - 1);
495 /* compute the words of a track name */
496 static char **track_to_words(const char *track,
497 const struct kvp *p) {
501 const char *rootless = track_rootless(track);
504 rootless = track; /* bodge */
506 if((w = words(casefold(strip_extension(rootless)), &nw)))
507 vector_append_many(&v, w, nw);
509 for(; p; p = p->next)
510 if(is_display_pref(p->name))
511 if((w = words(casefold(p->value), &nw)))
512 vector_append_many(&v, w, nw);
513 vector_terminate(&v);
514 return dedupe(v.vec, v.nvec);
517 /* return nonzero iff WORD is a stopword */
518 static int stopword(const char *word) {
521 for(n = 0; n < config->stopword.n
522 && strcmp(word, config->stopword.s[n]); ++n)
524 return n < config->stopword.n;
527 /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */
528 static int register_search_word(const char *track, const char *word,
530 if(stopword(word)) return 0;
531 return register_word(trackdb_searchdb, "search", track, word, tid);
534 /* Tags **********************************************************************/
536 /* Return nonzero if C is a valid tag character */
537 static int tagchar(int c) {
546 /* Parse and de-dupe a tag list. If S=0 then assumes "". */
547 static char **parsetags(const char *s) {
553 /* skip initial separators */
554 while(*s && (!tagchar(*s) || *s == ' '))
557 /* find the extent of the tag */
559 while(*s && tagchar(*s))
561 /* strip trailing spaces */
562 while(s > t && s[-1] == ' ')
564 vector_append(&v, xstrndup(t, s - t));
565 /* skip intermediate and trailing separators */
566 while(*s && (!tagchar(*s) || *s == ' '))
570 vector_terminate(&v);
571 return dedupe(v.vec, v.nvec);
574 /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */
575 static int register_tag(const char *track, const char *tag, DB_TXN *tid) {
576 return register_word(trackdb_tagsdb, "tags", track, tag, tid);
579 /* aliases *******************************************************************/
581 /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If
582 * there is no alias sets *aliasp to 0. */
583 static int compute_alias(char **aliasp,
588 const char *s = config->alias, *t, *expansion, *part;
589 int c, used_db = 0, slash_prefix, err;
591 const char *const root = find_track_root(track);
594 /* Bodge for tracks with no root */
599 dynstr_append_string(&d, root);
600 while((c = (unsigned char)*s++)) {
602 dynstr_append(&d, c);
605 if((slash_prefix = (*s == '/')))
608 assert(t != 0); /* validated at startup */
609 part = xstrndup(s, t - s);
610 expansion = getpart(track, "display", part, p, &used_db);
612 if(slash_prefix) dynstr_append(&d, '/');
613 dynstr_append_string(&d, expansion);
615 s = t + 1; /* skip {part} */
617 /* only admit to the alias if we used the db... */
622 dynstr_terminate(&d);
623 /* ...and the answer differs from the original... */
624 if(!strcmp(track, d.vec)) {
628 /* ...and there isn't already a different track with that name (including as
630 switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) {
632 if((s = kvp_get(at, "_alias_for"))
633 && !strcmp(s, track)) {
645 /* get track and prefs data (if tp/pp not null pointers). Returns 0 on
646 * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK.
647 * Always sets the return values, even if only to null pointers. */
648 static int gettrackdata(const char *track,
651 const char **actualp,
653 #define GTD_NOALIAS 0x0001
656 const char *actual = track;
657 struct kvp *t = 0, *p = 0;
659 if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done;
660 if((actual = kvp_get(t, "_alias_for"))) {
661 if(flags & GTD_NOALIAS) {
662 error(0, "alias passed to gettrackdata where real path required");
665 if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done;
670 if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK)
675 if(actualp) *actualp = actual;
681 /* trackdb_notice() **********************************************************/
683 /** @brief notice a possibly new track
684 * @return @c DB_NOTFOUND if new, 0 if already known
686 int trackdb_notice(const char *track,
692 tid = trackdb_begin_transaction();
693 err = trackdb_notice_tid(track, path, tid);
694 if((err == DB_LOCK_DEADLOCK)) goto fail;
697 trackdb_abort_transaction(tid);
699 trackdb_commit_transaction(tid);
703 /** @brief notice a possibly new track
704 * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also
706 int trackdb_notice_tid(const char *track,
710 struct kvp *t, *a, *p;
714 /* notice whether the tracks.db entry changes */
716 /* get any existing tracks entry */
717 if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK)
719 ret = err; /* 0 or DB_NOTFOUND */
720 /* this is a real track */
721 t_changed += kvp_set(&t, "_alias_for", 0);
722 t_changed += kvp_set(&t, "_path", path);
723 /* if we have an alias record it in the database */
724 if((err = compute_alias(&alias, track, p, tid))) return err;
726 /* won't overwrite someone else's alias as compute_alias() checks */
727 D(("%s: alias %s", track, alias));
729 kvp_set(&a, "_alias_for", track);
730 if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err;
732 /* update search.db */
733 w = track_to_words(track, p);
734 for(n = 0; w[n]; ++n)
735 if((err = register_search_word(track, w[n], tid)))
738 w = parsetags(kvp_get(p, "tags"));
739 for(n = 0; w[n]; ++n)
740 if((err = register_tag(track, w[n], tid)))
743 /* only store the tracks.db entry if it has changed */
744 if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)))
746 if(ret == DB_NOTFOUND) {
747 uint32_t timestamp[2];
752 timestamp[0] = htonl((uint64_t)now >> 32);
753 timestamp[1] = htonl((uint32_t)now);
754 memset(&key, 0, sizeof key);
755 key.data = timestamp;
756 key.size = sizeof timestamp;
757 switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key,
758 make_key(&data, track), 0)) {
760 case DB_LOCK_DEADLOCK: return err;
761 default: fatal(0, "error updating noticed.db: %s", db_strerror(err));
767 /* trackdb_obsolete() ********************************************************/
769 /* obsolete a track */
770 int trackdb_obsolete(const char *track, DB_TXN *tid) {
775 if((err = gettrackdata(track, 0, &p, 0,
776 GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK)
778 else if(err == DB_NOTFOUND) return 0;
779 /* compute the alias, if any, and delete it */
780 if(compute_alias(&alias, track, p, tid)) return err;
782 /* if the alias points to some other track then compute_alias won't
784 if(trackdb_delkey(trackdb_tracksdb, alias, tid))
787 /* update search.db */
788 w = track_to_words(track, p);
789 for(n = 0; w[n]; ++n)
790 if(trackdb_delkeydata(trackdb_searchdb,
791 w[n], track, tid) == DB_LOCK_DEADLOCK)
794 w = parsetags(kvp_get(p, "tags"));
795 for(n = 0; w[n]; ++n)
796 if(trackdb_delkeydata(trackdb_tagsdb,
797 w[n], track, tid) == DB_LOCK_DEADLOCK)
800 /* update tracks.db */
801 if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK)
803 /* We don't delete the prefs, so they survive temporary outages of the
804 * (possibly virtual) track filesystem */
808 /* trackdb_stats() ***********************************************************/
810 #define H(name) { #name, offsetof(DB_HASH_STAT, name) }
811 #define B(name) { #name, offsetof(DB_BTREE_STAT, name) }
813 static const struct statinfo {
816 } statinfo_hash[] = {
832 }, statinfo_btree[] = {
853 /* look up stats for DB */
854 static int get_stats(struct vector *v,
856 const struct statinfo *si,
865 switch(err = database->stat(database, tid, &sp, 0)) {
868 case DB_LOCK_DEADLOCK:
869 error(0, "error querying database: %s", db_strerror(err));
872 fatal(0, "error querying database: %s", db_strerror(err));
874 for(n = 0; n < nsi; ++n) {
875 byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name,
876 (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset));
877 vector_append(v, str);
883 struct search_entry {
888 /* find the top COUNT words in the search database */
889 static int search_league(struct vector *v, int count, DB_TXN *tid) {
890 struct search_entry *se;
893 int err, n = 0, nse = 0, i;
898 cursor = trackdb_opencursor(trackdb_searchdb, tid);
899 se = xmalloc(count * sizeof *se);
900 while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
902 if(word && wl == k.size && !strncmp(word, k.data, wl))
905 #define FINALIZE() do { \
906 if(word && (nse < count || n > se[nse - 1].n)) { \
911 while(i > 0 && n > se[i - 1].n) \
913 memmove(&se[i + 1], &se[i], (nse - i) * sizeof *se); \
919 word = xstrndup(k.data, wl = k.size);
927 case DB_LOCK_DEADLOCK:
928 error(0, "error querying search database: %s", db_strerror(err));
931 fatal(0, "error querying search database: %s", db_strerror(err));
933 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
936 byte_xasprintf(&str, "Top %d search words:", nse);
937 vector_append(v, str);
938 for(i = 0; i < nse; ++i) {
939 byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word);
940 vector_append(v, str);
945 #define SI(what) statinfo_##what, \
946 sizeof statinfo_##what / sizeof (struct statinfo)
948 /* return a list of database stats */
949 char **trackdb_stats(int *nstatsp) {
955 tid = trackdb_begin_transaction();
957 vector_append(&v, (char *)"Tracks database stats:");
958 if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail;
959 vector_append(&v, (char *)"");
960 vector_append(&v, (char *)"Search database stats:");
961 if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail;
962 vector_append(&v, (char *)"");
963 vector_append(&v, (char *)"Prefs database stats:");
964 if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail;
965 vector_append(&v, (char *)"");
966 if(search_league(&v, 10, tid)) goto fail;
967 vector_terminate(&v);
970 trackdb_abort_transaction(tid);
972 trackdb_commit_transaction(tid);
973 if(nstatsp) *nstatsp = v.nvec;
977 struct stats_details {
978 void (*done)(char *data, void *u);
980 int exited; /* subprocess exited */
981 int closed; /* pipe close */
982 int wstat; /* wait status from subprocess */
983 struct dynstr data[1]; /* data read from pipe */
986 static void stats_complete(struct stats_details *d) {
989 if(!(d->exited && d->closed))
991 byte_xasprintf(&s, "\n"
993 "track lookup cache hits: %lu\n"
994 "track lookup cache misses: %lu\n",
997 dynstr_append_string(d->data, s);
998 dynstr_terminate(d->data);
999 d->done(d->data->vec, d->u);
1002 static int stats_finished(ev_source attribute((unused)) *ev,
1003 pid_t attribute((unused)) pid,
1005 const struct rusage attribute((unused)) *rusage,
1007 struct stats_details *const d = u;
1011 error(0, "disorder-stats %s", wstat(status));
1016 static int stats_read(ev_source attribute((unused)) *ev,
1022 struct stats_details *const d = u;
1024 dynstr_append_bytes(d->data, ptr, bytes);
1025 ev_reader_consume(reader, bytes);
1032 static int stats_error(ev_source attribute((unused)) *ev,
1035 struct stats_details *const d = u;
1037 error(errno_value, "error reading from pipe to disorder-stats");
1043 void trackdb_stats_subprocess(ev_source *ev,
1044 void (*done)(char *data, void *u),
1048 struct stats_details *d = xmalloc(sizeof *d);
1050 dynstr_init(d->data);
1054 pid = subprogram(ev, "disorder-stats", p[1]);
1056 ev_child(ev, pid, 0, stats_finished, d);
1057 ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader");
1060 /* set a pref (remove if value=0) */
1061 int trackdb_set(const char *track,
1063 const char *value) {
1064 struct kvp *t, *p, *a;
1067 char *oldalias, *newalias, **oldtags = 0, **newtags;
1070 /* TODO: if value matches default then set value=0 */
1074 tid = trackdb_begin_transaction();
1075 if((err = gettrackdata(track, &t, &p, 0,
1076 0, tid)) == DB_LOCK_DEADLOCK)
1078 if(err == DB_NOTFOUND) break;
1079 if(name[0] == '_') {
1080 if(kvp_set(&t, name, value))
1081 if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))
1084 /* get the old alias name */
1085 if(compute_alias(&oldalias, track, p, tid)) goto fail;
1086 /* get the old tags */
1087 if(!strcmp(name, "tags"))
1088 oldtags = parsetags(kvp_get(p, "tags"));
1090 if(kvp_set(&p, name, value))
1091 if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0))
1093 /* compute the new alias name */
1094 if((err = compute_alias(&newalias, track, p, tid))) goto fail;
1095 /* check whether alias has changed */
1096 if(!(oldalias == newalias
1097 || (oldalias && newalias && !strcmp(oldalias, newalias)))) {
1098 /* adjust alias records to fit change */
1100 && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail;
1103 kvp_set(&a, "_alias_for", track);
1104 if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail;
1107 /* check whether tags have changed */
1108 if(!strcmp(name, "tags")) {
1109 newtags = parsetags(value);
1110 while(*oldtags || *newtags) {
1111 if(*oldtags && *newtags) {
1112 cmp = strcmp(*oldtags, *newtags);
1114 /* keeping this tag */
1118 /* old tag fits into a gap in the new list, so delete old */
1121 /* new tag fits into a gap in the old list, so insert new */
1123 } else if(*oldtags) {
1124 /* we've run out of new tags, so remaining old ones are to be
1127 if(trackdb_delkeydata(trackdb_tagsdb,
1128 *oldtags, track, tid) == DB_LOCK_DEADLOCK)
1132 /* we've run out of old tags, so remainig new ones are to be
1135 if(register_tag(track, *newtags, tid)) goto fail;
1145 trackdb_abort_transaction(tid);
1147 trackdb_commit_transaction(tid);
1148 return err == 0 ? 0 : -1;
1152 const char *trackdb_get(const char *track,
1154 return kvp_get(trackdb_get_all(track), name);
1157 /* get all prefs as a 0-terminated array */
1158 struct kvp *trackdb_get_all(const char *track) {
1159 struct kvp *t, *p, **pp;
1163 tid = trackdb_begin_transaction();
1164 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1168 trackdb_abort_transaction(tid);
1170 trackdb_commit_transaction(tid);
1171 for(pp = &p; *pp; pp = &(*pp)->next)
1178 const char *trackdb_resolve(const char *track) {
1183 tid = trackdb_begin_transaction();
1184 if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK)
1188 trackdb_abort_transaction(tid);
1190 trackdb_commit_transaction(tid);
1194 int trackdb_isalias(const char *track) {
1195 const char *actual = trackdb_resolve(track);
1197 return strcmp(actual, track);
1200 /* test whether a track exists (perhaps an alias) */
1201 int trackdb_exists(const char *track) {
1206 tid = trackdb_begin_transaction();
1207 /* unusually, here we want the return value */
1208 if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK)
1212 trackdb_abort_transaction(tid);
1214 trackdb_commit_transaction(tid);
1218 /* return the list of tags */
1219 char **trackdb_alltags(void) {
1225 tid = trackdb_begin_transaction();
1226 err = trackdb_alltags_tid(tid, &taglist);
1228 trackdb_abort_transaction(tid);
1230 trackdb_commit_transaction(tid);
1234 static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) {
1241 c = trackdb_opencursor(trackdb_tagsdb, tid);
1242 memset(&k, 0, sizeof k);
1243 while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP)))
1244 vector_append(&v, xstrndup(k.data, k.size));
1248 case DB_LOCK_DEADLOCK:
1251 fatal(0, "c->c_get: %s", db_strerror(err));
1253 if((err = trackdb_closecursor(c))) return err;
1254 vector_terminate(&v);
1259 /* return 1 iff sorted tag lists A and B have at least one member in common */
1260 static int tag_intersection(char **a, char **b) {
1263 /* Same sort of logic as trackdb_set() above */
1265 if(!(cmp = strcmp(*a, *b))) return 1;
1266 else if(cmp < 0) ++a;
1272 /* Check whether a track is suitable for random play. Returns 0 if it is,
1273 * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us
1275 static int check_suitable(const char *track,
1277 char **required_tags,
1278 char **prohibited_tags) {
1282 const char *pick_at_random, *played_time;
1284 /* don't pick tracks that aren't in any surviving collection (for instance
1285 * you've edited the config but the rescan hasn't done its job yet) */
1286 if(!find_track_root(track)) {
1287 info("found track not in any collection: %s", track);
1290 /* don't pick aliases - only pick the canonical form */
1291 if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
1292 return DB_LOCK_DEADLOCK;
1293 if(kvp_get(t, "_alias_for"))
1295 /* check that random play is not suppressed for this track */
1296 if((pick_at_random = kvp_get(p, "pick_at_random"))
1297 && !strcmp(pick_at_random, "0"))
1299 /* don't pick a track that's been played in the last 8 hours */
1300 if((played_time = kvp_get(p, "played_time"))) {
1301 last = atoll(played_time);
1303 if(now < last + 8 * 3600) /* TODO configurable */
1306 track_tags = parsetags(kvp_get(p, "tags"));
1307 /* check that no prohibited tag is present for this track */
1308 if(prohibited_tags && tag_intersection(track_tags, prohibited_tags))
1310 /* check that at least one required tags is present for this track */
1311 if(*required_tags && !tag_intersection(track_tags, required_tags))
1316 /* attempt to pick a random non-alias track */
1317 const char *trackdb_random(int tries) {
1322 const char *track, *candidate;
1325 char **required_tags, **prohibited_tags, **tp;
1330 tid = trackdb_begin_transaction();
1331 if((err = trackdb_get_global_tid("required-tags", tid, &tags)))
1333 required_tags = parsetags(tags);
1334 if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags)))
1336 prohibited_tags = parsetags(tags);
1338 if(*required_tags) {
1339 /* Bung all the suitable tracks into a hash and convert to a list of keys
1340 * (to eliminate duplicates). We cache this list since it is possible
1341 * that it will be very large. */
1344 for(tp = required_tags; *tp; ++tp) {
1345 c = trackdb_opencursor(trackdb_tagsdb, tid);
1346 memset(&key, 0, sizeof key);
1348 key.size = strlen(*tp);
1350 err = c->c_get(c, &key, prepare_data(&data), DB_SET);
1352 hash_add(h, xstrndup(data.data, data.size), 0,
1353 HASH_INSERT_OR_REPLACE);
1355 err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP);
1361 case DB_LOCK_DEADLOCK:
1364 fatal(0, "error querying tags.db: %s", db_strerror(err));
1366 trackdb_closecursor(c);
1369 error(0, "required tag %s does not match any tracks", *tp);
1371 nreqtracks = hash_count(h);
1372 reqtracks = hash_keys(h);
1374 while(nreqtracks && !track && tries-- > 0) {
1375 r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0));
1376 candidate = reqtracks[r];
1377 switch(check_suitable(candidate, tid,
1378 required_tags, prohibited_tags)) {
1384 case DB_LOCK_DEADLOCK:
1389 /* No required tags. We pick random record numbers in the database
1391 switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) {
1394 case DB_LOCK_DEADLOCK:
1395 error(0, "error querying tracks.db: %s", db_strerror(err));
1398 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1401 error(0, "cannot pick tracks at random from an empty database");
1402 while(sp->bt_nkeys && !track && tries-- > 0) {
1403 /* record numbers count from 1 upwards */
1404 r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0));
1405 memset(&key, sizeof key, 0);
1406 key.flags = DB_DBT_MALLOC;
1407 key.size = sizeof r;
1409 switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data),
1413 case DB_LOCK_DEADLOCK:
1414 error(0, "error querying tracks.db: %s", db_strerror(err));
1417 fatal(0, "error querying tracks.db: %s", db_strerror(err));
1419 candidate = xstrndup(key.data, key.size);
1420 switch(check_suitable(candidate, tid,
1421 required_tags, prohibited_tags)) {
1427 case DB_LOCK_DEADLOCK:
1434 trackdb_closecursor(c);
1436 trackdb_abort_transaction(tid);
1438 trackdb_commit_transaction(tid);
1440 error(0, "could not pick a random track");
1444 /* get a track name given the prefs. Set *used_db to 1 if we got the answer
1445 * from the prefs. */
1446 static const char *getpart(const char *track,
1447 const char *context,
1449 const struct kvp *p,
1454 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1455 if((result = kvp_get(p, pref)))
1458 result = trackname_part(track, context, part);
1459 assert(result != 0);
1463 /* get a track name part, like trackname_part(), but taking the database into
1465 const char *trackdb_getpart(const char *track,
1466 const char *context,
1474 /* construct the full pref */
1475 byte_xasprintf(&pref, "trackname_%s_%s", context, part);
1477 tid = trackdb_begin_transaction();
1478 if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK)
1482 trackdb_abort_transaction(tid);
1484 trackdb_commit_transaction(tid);
1485 return getpart(actual, context, part, p, &used_db);
1488 /* get the raw path name for @track@ (might be an alias) */
1489 const char *trackdb_rawpath(const char *track) {
1495 tid = trackdb_begin_transaction();
1496 if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK)
1500 trackdb_abort_transaction(tid);
1502 trackdb_commit_transaction(tid);
1503 if(!(path = kvp_get(t, "_path"))) path = track;
1507 /* trackdb_list **************************************************************/
1509 /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually
1510 * readable at some point */
1512 /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE.
1513 * If RE is a null pointer then it matches everything. */
1514 static int track_matches(size_t dl, const char *track, size_t tl,
1522 switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) {
1523 case PCRE_ERROR_NOMATCH: return 0;
1526 error(0, "pcre_exec returned %d, subject '%s'", rc, track);
1533 static int do_list(struct vector *v, const char *dir,
1534 enum trackdb_listable what, const pcre *re, DB_TXN *tid) {
1540 size_t l, last_dir_len = 0;
1541 char *last_dir = 0, *track, *alias;
1545 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1548 /* find the first key >= dir */
1549 err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE);
1550 /* keep going while we're dealing with <dir/anything> */
1553 && ((char *)k.data)[dl] == '/'
1554 && !memcmp(k.data, dir, dl)) {
1555 ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1));
1557 /* we have <dir/component/anything>, so <dir/component> is a directory */
1558 l = ptr - (char *)k.data;
1559 if(what & trackdb_directories)
1561 && l == last_dir_len
1562 && !memcmp(last_dir, k.data, l))) {
1563 last_dir = xstrndup(k.data, last_dir_len = l);
1564 if(track_matches(dl, k.data, l, re))
1565 vector_append(v, last_dir);
1568 /* found a plain file */
1569 if((what & trackdb_files)) {
1570 track = xstrndup(k.data, k.size);
1571 if((err = trackdb_getdata(trackdb_prefsdb,
1572 track, &p, tid)) == DB_LOCK_DEADLOCK)
1574 /* if this file has an alias in the same directory then we skip it */
1575 if((err = compute_alias(&alias, track, p, tid)))
1577 if(!(alias && !strcmp(d_dirname(alias), d_dirname(track))))
1578 if(track_matches(dl, k.data, k.size, re))
1579 vector_append(v, track);
1582 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1590 case DB_LOCK_DEADLOCK:
1591 error(0, "error querying database: %s", db_strerror(err));
1594 fatal(0, "error querying database: %s", db_strerror(err));
1597 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1601 /* return the directories or files below @dir@ */
1602 char **trackdb_list(const char *dir, int *np, enum trackdb_listable what,
1610 tid = trackdb_begin_transaction();
1613 if(do_list(&v, dir, what, re, tid))
1616 for(n = 0; n < config->collection.n; ++n)
1617 if(do_list(&v, config->collection.s[n].root, what, re, tid))
1622 trackdb_abort_transaction(tid);
1624 trackdb_commit_transaction(tid);
1625 vector_terminate(&v);
1631 /* If S is tag:something, return something. Else return 0. */
1632 static const char *checktag(const char *s) {
1633 if(!strncmp(s, "tag:", 4))
1639 /* return a list of tracks containing all of the words given. If you
1640 * ask for only stopwords you get no tracks. */
1641 char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) {
1642 const char **w, *best = 0, *tag;
1643 char **twords, **tags;
1644 int i, j, n, err, what;
1654 *ntracks = 0; /* for early returns */
1655 /* casefold all the words */
1656 w = xmalloc(nwordlist * sizeof (char *));
1657 for(n = 0; n < nwordlist; ++n) {
1658 w[n] = casefold(wordlist[n]);
1659 if(checktag(w[n])) ++ntags; /* count up tags */
1661 /* find the longest non-stopword */
1662 for(n = 0; n < nwordlist; ++n)
1663 if(!stopword(w[n]) && !checktag(w[n]))
1664 if(!best || strlen(w[n]) > strlen(best))
1666 /* TODO: we should at least in principal be able to identify the word or tag
1667 * with the least matches in log time, and choose that as our primary search
1669 if(ntags && !best) {
1670 /* Only tags are listed. We limit to the first and narrow down with the
1672 best = checktag(w[0]);
1673 db = trackdb_tagsdb;
1676 /* We can limit to some word. */
1677 db = trackdb_searchdb;
1680 /* Only stopwords */
1686 tid = trackdb_begin_transaction();
1687 /* find all the tracks that have that word */
1692 cursor = trackdb_opencursor(db, tid);
1693 while(!(err = cursor->c_get(cursor, &k, &d, what))) {
1694 vector_append(&v, xstrndup(d.data, d.size));
1701 case DB_LOCK_DEADLOCK:
1702 error(0, "error querying %s database: %s", dbname, db_strerror(err));
1705 fatal(0, "error querying %s database: %s", dbname, db_strerror(err));
1707 if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
1709 /* do a naive search over that (hopefuly fairly small) list of tracks */
1711 for(n = 0; n < v.nvec; ++n) {
1712 if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK))
1715 error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err));
1718 twords = track_to_words(v.vec[n], p);
1719 tags = parsetags(kvp_get(p, "tags"));
1720 for(i = 0; i < nwordlist; ++i) {
1721 if((tag = checktag(w[i]))) {
1722 /* Track must have this tag */
1723 for(j = 0; tags[j]; ++j)
1724 if(!strcmp(tag, tags[j])) break; /* tag found */
1725 if(!tags[j]) break; /* tag not found */
1727 /* Track must contain this word */
1728 for(j = 0; twords[j]; ++j)
1729 if(!strcmp(w[i], twords[j])) break; /* word found */
1730 if(!twords[j]) break; /* word not found */
1733 if(i >= nwordlist) /* all words found */
1734 vector_append(&u, v.vec[n]);
1738 trackdb_closecursor(cursor);
1740 trackdb_abort_transaction(tid);
1741 info("retrying search");
1743 trackdb_commit_transaction(tid);
1744 vector_terminate(&u);
1750 /* trackdb_scan **************************************************************/
1752 int trackdb_scan(const char *root,
1753 int (*callback)(const char *track,
1761 const size_t root_len = root ? strlen(root) : 0;
1766 cursor = trackdb_opencursor(trackdb_tracksdb, tid);
1768 err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d),
1771 memset(&k, 0, sizeof k);
1772 err = cursor->c_get(cursor, &k, prepare_data(&d),
1777 || (k.size > root_len
1778 && !strncmp(k.data, root, root_len)
1779 && ((char *)k.data)[root_len] == '/')) {
1780 data = kvp_urldecode(d.data, d.size);
1781 if(kvp_get(data, "_path")) {
1782 track = xstrndup(k.data, k.size);
1783 /* Advance to the next track before the callback so that the callback
1784 * may safely delete the track */
1785 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1786 if((cberr = callback(track, data, u, tid))) {
1791 err = cursor->c_get(cursor, &k, &d, DB_NEXT);
1795 trackdb_closecursor(cursor);
1802 case DB_LOCK_DEADLOCK:
1803 error(0, "c->c_get: %s", db_strerror(err));
1806 fatal(0, "c->c_get: %s", db_strerror(err));
1810 /* trackdb_rescan ************************************************************/
1812 /* called when the rescanner terminates */
1813 static int reap_rescan(ev_source attribute((unused)) *ev,
1816 const struct rusage attribute((unused)) *rusage,
1817 void attribute((unused)) *u) {
1818 if(pid == rescan_pid) rescan_pid = -1;
1820 error(0, "disorderd-rescan: %s", wstat(status));
1822 D(("disorderd-rescan terminate: %s", wstat(status)));
1823 /* Our cache of file lookups is out of date now */
1824 cache_clean(&cache_files_type);
1825 eventlog("rescanned", (char *)0);
1829 void trackdb_rescan(ev_source *ev) {
1831 if(rescan_pid != -1) {
1832 error(0, "rescan already underway");
1835 rescan_pid = subprogram(ev, RESCAN, -1);
1837 ev_child(ev, rescan_pid, 0, reap_rescan, 0);
1838 D(("started rescanner"));
1840 /* This is the first rescan, we block until it is complete */
1841 while(waitpid(rescan_pid, &w, 0) < 0 && errno == EINTR)
1843 reap_rescan(0, rescan_pid, w, 0, 0);
1847 int trackdb_rescan_cancel(void) {
1848 if(rescan_pid == -1) return 0;
1849 if(kill(rescan_pid, SIGTERM) < 0)
1850 fatal(errno, "error killing rescanner");
1855 /* global prefs **************************************************************/
1857 void trackdb_set_global(const char *name,
1865 memset(&k, 0, sizeof k);
1866 memset(&d, 0, sizeof d);
1867 k.data = (void *)name;
1868 k.size = strlen(name);
1870 d.data = (void *)value;
1871 d.size = strlen(value);
1874 tid = trackdb_begin_transaction();
1876 err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0);
1878 err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0);
1879 if(!err || err == DB_NOTFOUND) break;
1880 if(err != DB_LOCK_DEADLOCK)
1881 fatal(0, "error updating database: %s", db_strerror(err));
1882 trackdb_abort_transaction(tid);
1884 trackdb_commit_transaction(tid);
1885 /* log important state changes */
1886 if(!strcmp(name, "playing")) {
1887 state = !value || !strcmp(value, "yes");
1888 info("playing %s by %s",
1889 state ? "enabled" : "disabled",
1891 eventlog("state", state ? "enable_play" : "disable_play", (char *)0);
1893 if(!strcmp(name, "random-play")) {
1894 state = !value || !strcmp(value, "yes");
1895 info("random play %s by %s",
1896 state ? "enabled" : "disabled",
1898 eventlog("state", state ? "enable_random" : "disable_random", (char *)0);
1900 if(!strcmp(name, "required-tags"))
1904 const char *trackdb_get_global(const char *name) {
1910 tid = trackdb_begin_transaction();
1911 if(!(err = trackdb_get_global_tid(name, tid, &r)))
1913 trackdb_abort_transaction(tid);
1915 trackdb_commit_transaction(tid);
1919 static int trackdb_get_global_tid(const char *name,
1925 memset(&k, 0, sizeof k);
1926 k.data = (void *)name;
1927 k.size = strlen(name);
1928 switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k,
1929 prepare_data(&d), 0)) {
1931 *rp = xstrndup(d.data, d.size);
1936 case DB_LOCK_DEADLOCK:
1939 fatal(0, "error updating database: %s", db_strerror(err));
1943 /** @brief Retrieve the most recently added tracks
1944 * @param ntracksp Where to put count, or 0
1945 * @param maxtracks Maximum number of tracks to retrieve
1946 * @return null-terminated array of track names
1948 * The most recently added track is first in the array.
1950 char **trackdb_new(int *ntracksp,
1956 tid = trackdb_begin_transaction();
1957 tracks = trackdb_new_tid(ntracksp, maxtracks, tid);
1960 trackdb_abort_transaction(tid);
1962 trackdb_commit_transaction(tid);
1966 /** @brief Retrieve the most recently added tracks
1967 * @param ntracksp Where to put count, or 0
1968 * @param maxtracks Maximum number of tracks to retrieve, or 0 for all
1969 * @param tid Transaction ID
1970 * @return null-terminated array of track names, or NULL on deadlock
1972 * The most recently added track is first in the array.
1974 static char **trackdb_new_tid(int *ntracksp,
1980 struct vector tracks[1];
1982 vector_init(tracks);
1983 c = trackdb_opencursor(trackdb_noticeddb, tid);
1984 while((maxtracks <= 0 || tracks->nvec < maxtracks)
1985 && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV)))
1986 vector_append(tracks, xstrndup(d.data, d.size));
1988 case 0: /* hit maxtracks */
1989 case DB_NOTFOUND: /* ran out of tracks */
1991 case DB_LOCK_DEADLOCK:
1992 trackdb_closecursor(c);
1995 fatal(0, "error reading noticed.db: %s", db_strerror(err));
1997 if((err = trackdb_closecursor(c)))
1998 return 0; /* deadlock */
1999 vector_terminate(tracks);
2001 *ntracksp = tracks->nvec;
2005 /** @brief Expire noticed.db
2006 * @param earliest Earliest timestamp to keep
2008 void trackdb_expire_noticed(time_t earliest) {
2012 tid = trackdb_begin_transaction();
2013 if(!trackdb_expire_noticed_tid(earliest, tid))
2015 trackdb_abort_transaction(tid);
2017 trackdb_commit_transaction(tid);
2020 /** @brief Expire noticed.db
2021 * @param earliest Earliest timestamp to keep
2022 * @param tid Transaction ID
2023 * @return 0 or DB_LOCK_DEADLOCK
2025 static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) {
2033 c = trackdb_opencursor(trackdb_noticeddb, tid);
2034 while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) {
2036 when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1]));
2037 if(when >= earliest)
2039 if((err = c->c_del(c, 0))) {
2040 if(err != DB_LOCK_DEADLOCK)
2041 fatal(0, "error deleting expired noticed.db entry: %s",
2047 if(err == DB_NOTFOUND)
2049 if(err && err != DB_LOCK_DEADLOCK)
2050 fatal(0, "error expiring noticed.db: %s", db_strerror(err));
2052 if((err = trackdb_closecursor(c))) {
2053 if(err != DB_LOCK_DEADLOCK)
2054 fatal(0, "error closing cursor: %s", db_strerror(err));
2058 info("expired %d tracks from noticed.db", count);
2062 /* tidying up ****************************************************************/
2064 void trackdb_gc(void) {
2068 if((err = trackdb_env->txn_checkpoint(trackdb_env,
2069 config->checkpoint_kbyte,
2070 config->checkpoint_min,
2072 fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err));
2073 if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE)))
2074 fatal(0, "trackdb_env->log_archive: %s", db_strerror(err));
2075 /* This makes catastrophic recovery impossible. However, the user can still
2076 * preserve the important data by using disorder-dump to snapshot their
2077 * prefs, and later to restore it. This is likely to have much small
2078 * long-term storage requirements than record the db logfiles. */
2086 indent-tabs-mode:nil