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