| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2005, 2006, 2007 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 | #include <arpa/inet.h> |
| 37 | |
| 38 | #include "event.h" |
| 39 | #include "mem.h" |
| 40 | #include "kvp.h" |
| 41 | #include "log.h" |
| 42 | #include "vector.h" |
| 43 | #include "trackdb.h" |
| 44 | #include "configuration.h" |
| 45 | #include "syscalls.h" |
| 46 | #include "wstat.h" |
| 47 | #include "words.h" |
| 48 | #include "printf.h" |
| 49 | #include "filepart.h" |
| 50 | #include "trackname.h" |
| 51 | #include "trackdb-int.h" |
| 52 | #include "logfd.h" |
| 53 | #include "cache.h" |
| 54 | #include "eventlog.h" |
| 55 | #include "hash.h" |
| 56 | |
| 57 | #define RESCAN "disorder-rescan" |
| 58 | #define DEADLOCK "disorder-deadlock" |
| 59 | |
| 60 | static const char *getpart(const char *track, |
| 61 | const char *context, |
| 62 | const char *part, |
| 63 | const struct kvp *p, |
| 64 | int *used_db); |
| 65 | static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp); |
| 66 | static int trackdb_get_global_tid(const char *name, |
| 67 | DB_TXN *tid, |
| 68 | const char **rp); |
| 69 | static char **trackdb_new_tid(int *ntracksp, |
| 70 | int maxtracks, |
| 71 | DB_TXN *tid); |
| 72 | static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid); |
| 73 | |
| 74 | const struct cache_type cache_files_type = { 86400 }; |
| 75 | unsigned long cache_files_hits, cache_files_misses; |
| 76 | |
| 77 | /* setup and teardown ********************************************************/ |
| 78 | |
| 79 | static const char *home; /* home had better not change */ |
| 80 | DB_ENV *trackdb_env; /* db environment */ |
| 81 | DB *trackdb_tracksdb; /* the db itself */ |
| 82 | DB *trackdb_prefsdb; /* preferences */ |
| 83 | DB *trackdb_searchdb; /* the search database */ |
| 84 | DB *trackdb_tagsdb; /* the tags database */ |
| 85 | DB *trackdb_globaldb; /* global preferences */ |
| 86 | DB *trackdb_noticeddb; /* when track noticed */ |
| 87 | static pid_t db_deadlock_pid = -1; /* deadlock manager PID */ |
| 88 | static pid_t rescan_pid = -1; /* rescanner PID */ |
| 89 | static int initialized, opened; /* state */ |
| 90 | |
| 91 | /* tracks matched by required_tags */ |
| 92 | static char **reqtracks; |
| 93 | static size_t nreqtracks; |
| 94 | |
| 95 | /* comparison function for keys */ |
| 96 | static int compare(DB attribute((unused)) *db_, |
| 97 | const DBT *a, const DBT *b) { |
| 98 | return compare_path_raw(a->data, a->size, b->data, b->size); |
| 99 | } |
| 100 | |
| 101 | /* open environment */ |
| 102 | void trackdb_init(int recover) { |
| 103 | int err; |
| 104 | static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL }; |
| 105 | |
| 106 | /* sanity checks */ |
| 107 | assert(initialized == 0); |
| 108 | ++initialized; |
| 109 | if(home) { |
| 110 | if(strcmp(home, config->home)) |
| 111 | fatal(0, "cannot change db home without server restart"); |
| 112 | home = config->home; |
| 113 | } |
| 114 | |
| 115 | /* create environment */ |
| 116 | if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s", |
| 117 | db_strerror(err)); |
| 118 | if((err = trackdb_env->set_alloc(trackdb_env, |
| 119 | xmalloc_noptr, xrealloc_noptr, xfree))) |
| 120 | fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err)); |
| 121 | if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000))) |
| 122 | fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err)); |
| 123 | if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000))) |
| 124 | fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err)); |
| 125 | if((err = trackdb_env->open(trackdb_env, config->home, |
| 126 | DB_INIT_LOG |
| 127 | |DB_INIT_LOCK |
| 128 | |DB_INIT_MPOOL |
| 129 | |DB_INIT_TXN |
| 130 | |DB_CREATE |
| 131 | |recover_type[recover], |
| 132 | 0666))) |
| 133 | fatal(0, "trackdb_env->open %s: %s", config->home, db_strerror(err)); |
| 134 | trackdb_env->set_errpfx(trackdb_env, "DB"); |
| 135 | trackdb_env->set_errfile(trackdb_env, stderr); |
| 136 | trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1); |
| 137 | trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1); |
| 138 | trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1); |
| 139 | D(("initialized database environment")); |
| 140 | } |
| 141 | |
| 142 | /* called when deadlock manager terminates */ |
| 143 | static int reap_db_deadlock(ev_source attribute((unused)) *ev, |
| 144 | pid_t attribute((unused)) pid, |
| 145 | int status, |
| 146 | const struct rusage attribute((unused)) *rusage, |
| 147 | void attribute((unused)) *u) { |
| 148 | db_deadlock_pid = -1; |
| 149 | if(initialized) |
| 150 | fatal(0, "deadlock manager unexpectedly terminated: %s", |
| 151 | wstat(status)); |
| 152 | else |
| 153 | D(("deadlock manager terminated: %s", wstat(status))); |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static pid_t subprogram(ev_source *ev, const char *prog) { |
| 158 | pid_t pid; |
| 159 | int lfd; |
| 160 | |
| 161 | /* If we're in the background then trap subprocess stdout/stderr */ |
| 162 | if(!isatty(2)) |
| 163 | lfd = logfd(ev, prog); |
| 164 | else |
| 165 | lfd = -1; |
| 166 | if(!(pid = xfork())) { |
| 167 | exitfn = _exit; |
| 168 | ev_signal_atfork(ev); |
| 169 | signal(SIGPIPE, SIG_DFL); |
| 170 | if(lfd != -1) { |
| 171 | xdup2(lfd, 1); |
| 172 | xdup2(lfd, 2); |
| 173 | } |
| 174 | /* If we were negatively niced, undo it. We don't bother checking for |
| 175 | * error, it's not that important. */ |
| 176 | setpriority(PRIO_PROCESS, 0, 0); |
| 177 | execlp(prog, prog, "--config", configfile, |
| 178 | debugging ? "--debug" : "--no-debug", |
| 179 | (char *)0); |
| 180 | fatal(errno, "error invoking %s", prog); |
| 181 | } |
| 182 | if(lfd != -1) xclose(lfd); |
| 183 | return pid; |
| 184 | } |
| 185 | |
| 186 | /* start deadlock manager */ |
| 187 | void trackdb_master(ev_source *ev) { |
| 188 | assert(db_deadlock_pid == -1); |
| 189 | db_deadlock_pid = subprogram(ev, DEADLOCK); |
| 190 | ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0); |
| 191 | D(("started deadlock manager")); |
| 192 | } |
| 193 | |
| 194 | /* close environment */ |
| 195 | void trackdb_deinit(void) { |
| 196 | int err; |
| 197 | |
| 198 | /* sanity checks */ |
| 199 | assert(initialized == 1); |
| 200 | --initialized; |
| 201 | |
| 202 | /* close the environment */ |
| 203 | if((err = trackdb_env->close(trackdb_env, 0))) |
| 204 | fatal(0, "trackdb_env->close: %s", db_strerror(err)); |
| 205 | |
| 206 | if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0) |
| 207 | fatal(errno, "error killing rescanner"); |
| 208 | |
| 209 | /* terminate the deadlock manager */ |
| 210 | if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0) |
| 211 | fatal(errno, "error killing deadlock manager"); |
| 212 | db_deadlock_pid = -1; |
| 213 | |
| 214 | D(("deinitialized database environment")); |
| 215 | } |
| 216 | |
| 217 | /* open a specific database */ |
| 218 | static DB *open_db(const char *path, |
| 219 | u_int32_t dbflags, |
| 220 | DBTYPE dbtype, |
| 221 | u_int32_t openflags, |
| 222 | int mode) { |
| 223 | int err; |
| 224 | DB *db; |
| 225 | |
| 226 | D(("open %s", path)); |
| 227 | path = config_get_file(path); |
| 228 | if((err = db_create(&db, trackdb_env, 0))) |
| 229 | fatal(0, "db_create %s: %s", path, db_strerror(err)); |
| 230 | if(dbflags) |
| 231 | if((err = db->set_flags(db, dbflags))) |
| 232 | fatal(0, "db->set_flags %s: %s", path, db_strerror(err)); |
| 233 | if(dbtype == DB_BTREE) |
| 234 | if((err = db->set_bt_compare(db, compare))) |
| 235 | fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err)); |
| 236 | if((err = db->open(db, 0, path, 0, dbtype, |
| 237 | openflags | DB_AUTO_COMMIT, mode))) |
| 238 | fatal(0, "db->open %s: %s", path, db_strerror(err)); |
| 239 | return db; |
| 240 | } |
| 241 | |
| 242 | /* open track databases */ |
| 243 | void trackdb_open(void) { |
| 244 | /* sanity checks */ |
| 245 | assert(opened == 0); |
| 246 | ++opened; |
| 247 | /* open the databases */ |
| 248 | trackdb_tracksdb = open_db("tracks.db", |
| 249 | DB_RECNUM, DB_BTREE, DB_CREATE, 0666); |
| 250 | trackdb_searchdb = open_db("search.db", |
| 251 | DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666); |
| 252 | trackdb_tagsdb = open_db("tags.db", |
| 253 | DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666); |
| 254 | trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666); |
| 255 | trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666); |
| 256 | trackdb_noticeddb = open_db("noticed.db", |
| 257 | DB_DUPSORT, DB_BTREE, DB_CREATE, 0666); |
| 258 | D(("opened databases")); |
| 259 | } |
| 260 | |
| 261 | /* close track databases */ |
| 262 | void trackdb_close(void) { |
| 263 | int err; |
| 264 | |
| 265 | /* sanity checks */ |
| 266 | assert(opened == 1); |
| 267 | --opened; |
| 268 | if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0))) |
| 269 | fatal(0, "error closing tracks.db: %s", db_strerror(err)); |
| 270 | if((err = trackdb_searchdb->close(trackdb_searchdb, 0))) |
| 271 | fatal(0, "error closing search.db: %s", db_strerror(err)); |
| 272 | if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0))) |
| 273 | fatal(0, "error closing tags.db: %s", db_strerror(err)); |
| 274 | if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0))) |
| 275 | fatal(0, "error closing prefs.db: %s", db_strerror(err)); |
| 276 | if((err = trackdb_globaldb->close(trackdb_globaldb, 0))) |
| 277 | fatal(0, "error closing global.db: %s", db_strerror(err)); |
| 278 | if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0))) |
| 279 | fatal(0, "error closing noticed.db: %s", db_strerror(err)); |
| 280 | trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0; |
| 281 | trackdb_tagsdb = trackdb_globaldb = 0; |
| 282 | D(("closed databases")); |
| 283 | } |
| 284 | |
| 285 | /* generic db routines *******************************************************/ |
| 286 | |
| 287 | /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or |
| 288 | * DB_LOCK_DEADLOCK. */ |
| 289 | int trackdb_getdata(DB *db, |
| 290 | const char *track, |
| 291 | struct kvp **kp, |
| 292 | DB_TXN *tid) { |
| 293 | int err; |
| 294 | DBT key, data; |
| 295 | |
| 296 | switch(err = db->get(db, tid, make_key(&key, track), |
| 297 | prepare_data(&data), 0)) { |
| 298 | case 0: |
| 299 | *kp = kvp_urldecode(data.data, data.size); |
| 300 | return 0; |
| 301 | case DB_NOTFOUND: |
| 302 | *kp = 0; |
| 303 | return err; |
| 304 | case DB_LOCK_DEADLOCK: |
| 305 | error(0, "error querying database: %s", db_strerror(err)); |
| 306 | return err; |
| 307 | default: |
| 308 | fatal(0, "error querying database: %s", db_strerror(err)); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /* encode and store a database entry. Returns 0, DB_KEYEXIST or |
| 313 | * DB_LOCK_DEADLOCK. */ |
| 314 | int trackdb_putdata(DB *db, |
| 315 | const char *track, |
| 316 | const struct kvp *k, |
| 317 | DB_TXN *tid, |
| 318 | u_int32_t flags) { |
| 319 | int err; |
| 320 | DBT key, data; |
| 321 | |
| 322 | switch(err = db->put(db, tid, make_key(&key, track), |
| 323 | encode_data(&data, k), flags)) { |
| 324 | case 0: |
| 325 | case DB_KEYEXIST: |
| 326 | return err; |
| 327 | case DB_LOCK_DEADLOCK: |
| 328 | error(0, "error updating database: %s", db_strerror(err)); |
| 329 | return err; |
| 330 | default: |
| 331 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* delete a database entry */ |
| 336 | int trackdb_delkey(DB *db, |
| 337 | const char *track, |
| 338 | DB_TXN *tid) { |
| 339 | int err; |
| 340 | |
| 341 | DBT key; |
| 342 | switch(err = db->del(db, tid, make_key(&key, track), 0)) { |
| 343 | case 0: |
| 344 | case DB_NOTFOUND: |
| 345 | return 0; |
| 346 | case DB_LOCK_DEADLOCK: |
| 347 | error(0, "error updating database: %s", db_strerror(err)); |
| 348 | return err; |
| 349 | default: |
| 350 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | /* open a database cursor */ |
| 355 | DBC *trackdb_opencursor(DB *db, DB_TXN *tid) { |
| 356 | int err; |
| 357 | DBC *c; |
| 358 | |
| 359 | switch(err = db->cursor(db, tid, &c, 0)) { |
| 360 | case 0: break; |
| 361 | default: fatal(0, "error creating cursor: %s", db_strerror(err)); |
| 362 | } |
| 363 | return c; |
| 364 | } |
| 365 | |
| 366 | /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */ |
| 367 | int trackdb_closecursor(DBC *c) { |
| 368 | int err; |
| 369 | |
| 370 | if(!c) return 0; |
| 371 | switch(err = c->c_close(c)) { |
| 372 | case 0: |
| 373 | return err; |
| 374 | case DB_LOCK_DEADLOCK: |
| 375 | error(0, "error closing cursor: %s", db_strerror(err)); |
| 376 | return err; |
| 377 | default: |
| 378 | fatal(0, "error closing cursor: %s", db_strerror(err)); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */ |
| 383 | int trackdb_delkeydata(DB *db, |
| 384 | const char *word, |
| 385 | const char *track, |
| 386 | DB_TXN *tid) { |
| 387 | int err; |
| 388 | DBC *c; |
| 389 | DBT key, data; |
| 390 | |
| 391 | c = trackdb_opencursor(db, tid); |
| 392 | switch(err = c->c_get(c, make_key(&key, word), |
| 393 | make_key(&data, track), DB_GET_BOTH)) { |
| 394 | case 0: |
| 395 | switch(err = c->c_del(c, 0)) { |
| 396 | case 0: |
| 397 | break; |
| 398 | case DB_KEYEMPTY: |
| 399 | err = 0; |
| 400 | break; |
| 401 | case DB_LOCK_DEADLOCK: |
| 402 | error(0, "error updating database: %s", db_strerror(err)); |
| 403 | break; |
| 404 | default: |
| 405 | fatal(0, "c->c_del: %s", db_strerror(err)); |
| 406 | } |
| 407 | break; |
| 408 | case DB_NOTFOUND: |
| 409 | break; |
| 410 | case DB_LOCK_DEADLOCK: |
| 411 | error(0, "error updating database: %s", db_strerror(err)); |
| 412 | break; |
| 413 | default: |
| 414 | fatal(0, "c->c_get: %s", db_strerror(err)); |
| 415 | } |
| 416 | if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK; |
| 417 | return err; |
| 418 | } |
| 419 | |
| 420 | /* start a transaction */ |
| 421 | DB_TXN *trackdb_begin_transaction(void) { |
| 422 | DB_TXN *tid; |
| 423 | int err; |
| 424 | |
| 425 | if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0))) |
| 426 | fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err)); |
| 427 | return tid; |
| 428 | } |
| 429 | |
| 430 | /* abort transaction */ |
| 431 | void trackdb_abort_transaction(DB_TXN *tid) { |
| 432 | int err; |
| 433 | |
| 434 | if(tid) |
| 435 | if((err = tid->abort(tid))) |
| 436 | fatal(0, "tid->abort: %s", db_strerror(err)); |
| 437 | } |
| 438 | |
| 439 | /* commit transaction */ |
| 440 | void trackdb_commit_transaction(DB_TXN *tid) { |
| 441 | int err; |
| 442 | |
| 443 | if((err = tid->commit(tid, 0))) |
| 444 | fatal(0, "tid->commit: %s", db_strerror(err)); |
| 445 | } |
| 446 | |
| 447 | /* search/tags shared code ***************************************************/ |
| 448 | |
| 449 | /* comparison function used by dedupe() */ |
| 450 | static int wordcmp(const void *a, const void *b) { |
| 451 | return strcmp(*(const char **)a, *(const char **)b); |
| 452 | } |
| 453 | |
| 454 | /* sort and de-dupe VEC */ |
| 455 | static char **dedupe(char **vec, int nvec) { |
| 456 | int m, n; |
| 457 | |
| 458 | qsort(vec, nvec, sizeof (char *), wordcmp); |
| 459 | m = n = 0; |
| 460 | if(nvec) { |
| 461 | vec[m++] = vec[0]; |
| 462 | for(n = 1; n < nvec; ++n) |
| 463 | if(strcmp(vec[n], vec[m - 1])) |
| 464 | vec[m++] = vec[n]; |
| 465 | } |
| 466 | vec[m] = 0; |
| 467 | return vec; |
| 468 | } |
| 469 | |
| 470 | /* update a key/track database. Returns 0 or DB_DEADLOCK. */ |
| 471 | static int register_word(DB *db, const char *what, |
| 472 | const char *track, const char *word, |
| 473 | DB_TXN *tid) { |
| 474 | int err; |
| 475 | DBT key, data; |
| 476 | |
| 477 | switch(err = db->put(db, tid, make_key(&key, word), |
| 478 | make_key(&data, track), DB_NODUPDATA)) { |
| 479 | case 0: |
| 480 | case DB_KEYEXIST: |
| 481 | return 0; |
| 482 | case DB_LOCK_DEADLOCK: |
| 483 | error(0, "error updating %s.db: %s", what, db_strerror(err)); |
| 484 | return err; |
| 485 | default: |
| 486 | fatal(0, "error updating %s.db: %s", what, db_strerror(err)); |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | /* search primitives *********************************************************/ |
| 491 | |
| 492 | /* return true iff NAME is a trackname_display_ pref */ |
| 493 | static int is_display_pref(const char *name) { |
| 494 | static const char prefix[] = "trackname_display_"; |
| 495 | return !strncmp(name, prefix, (sizeof prefix) - 1); |
| 496 | } |
| 497 | |
| 498 | /* compute the words of a track name */ |
| 499 | static char **track_to_words(const char *track, |
| 500 | const struct kvp *p) { |
| 501 | struct vector v; |
| 502 | char **w; |
| 503 | int nw; |
| 504 | const char *rootless = track_rootless(track); |
| 505 | |
| 506 | if(!rootless) |
| 507 | rootless = track; /* bodge */ |
| 508 | vector_init(&v); |
| 509 | if((w = words(casefold(strip_extension(rootless)), &nw))) |
| 510 | vector_append_many(&v, w, nw); |
| 511 | |
| 512 | for(; p; p = p->next) |
| 513 | if(is_display_pref(p->name)) |
| 514 | if((w = words(casefold(p->value), &nw))) |
| 515 | vector_append_many(&v, w, nw); |
| 516 | vector_terminate(&v); |
| 517 | return dedupe(v.vec, v.nvec); |
| 518 | } |
| 519 | |
| 520 | /* return nonzero iff WORD is a stopword */ |
| 521 | static int stopword(const char *word) { |
| 522 | int n; |
| 523 | |
| 524 | for(n = 0; n < config->stopword.n |
| 525 | && strcmp(word, config->stopword.s[n]); ++n) |
| 526 | ; |
| 527 | return n < config->stopword.n; |
| 528 | } |
| 529 | |
| 530 | /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */ |
| 531 | static int register_search_word(const char *track, const char *word, |
| 532 | DB_TXN *tid) { |
| 533 | if(stopword(word)) return 0; |
| 534 | return register_word(trackdb_searchdb, "search", track, word, tid); |
| 535 | } |
| 536 | |
| 537 | /* Tags **********************************************************************/ |
| 538 | |
| 539 | /* Return nonzero if C is a valid tag character */ |
| 540 | static int tagchar(int c) { |
| 541 | switch(c) { |
| 542 | case ',': |
| 543 | return 0; |
| 544 | default: |
| 545 | return c >= ' '; |
| 546 | } |
| 547 | } |
| 548 | |
| 549 | /* Parse and de-dupe a tag list. If S=0 then assumes "". */ |
| 550 | static char **parsetags(const char *s) { |
| 551 | const char *t; |
| 552 | struct vector v; |
| 553 | |
| 554 | vector_init(&v); |
| 555 | if(s) { |
| 556 | /* skip initial separators */ |
| 557 | while(*s && (!tagchar(*s) || *s == ' ')) |
| 558 | ++s; |
| 559 | while(*s) { |
| 560 | /* find the extent of the tag */ |
| 561 | t = s; |
| 562 | while(*s && tagchar(*s)) |
| 563 | ++s; |
| 564 | /* strip trailing spaces */ |
| 565 | while(s > t && s[-1] == ' ') |
| 566 | --s; |
| 567 | vector_append(&v, xstrndup(t, s - t)); |
| 568 | /* skip intermediate and trailing separators */ |
| 569 | while(*s && (!tagchar(*s) || *s == ' ')) |
| 570 | ++s; |
| 571 | } |
| 572 | } |
| 573 | vector_terminate(&v); |
| 574 | return dedupe(v.vec, v.nvec); |
| 575 | } |
| 576 | |
| 577 | /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */ |
| 578 | static int register_tag(const char *track, const char *tag, DB_TXN *tid) { |
| 579 | return register_word(trackdb_tagsdb, "tags", track, tag, tid); |
| 580 | } |
| 581 | |
| 582 | /* aliases *******************************************************************/ |
| 583 | |
| 584 | /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If |
| 585 | * there is no alias sets *aliasp to 0. */ |
| 586 | static int compute_alias(char **aliasp, |
| 587 | const char *track, |
| 588 | const struct kvp *p, |
| 589 | DB_TXN *tid) { |
| 590 | struct dynstr d; |
| 591 | const char *s = config->alias, *t, *expansion, *part; |
| 592 | int c, used_db = 0, slash_prefix, err; |
| 593 | struct kvp *at; |
| 594 | const char *const root = find_track_root(track); |
| 595 | |
| 596 | if(!root) { |
| 597 | /* Bodge for tracks with no root */ |
| 598 | *aliasp = 0; |
| 599 | return 0; |
| 600 | } |
| 601 | dynstr_init(&d); |
| 602 | dynstr_append_string(&d, root); |
| 603 | while((c = (unsigned char)*s++)) { |
| 604 | if(c != '{') { |
| 605 | dynstr_append(&d, c); |
| 606 | continue; |
| 607 | } |
| 608 | if((slash_prefix = (*s == '/'))) |
| 609 | s++; |
| 610 | t = strchr(s, '}'); |
| 611 | assert(t != 0); /* validated at startup */ |
| 612 | part = xstrndup(s, t - s); |
| 613 | expansion = getpart(track, "display", part, p, &used_db); |
| 614 | if(*expansion) { |
| 615 | if(slash_prefix) dynstr_append(&d, '/'); |
| 616 | dynstr_append_string(&d, expansion); |
| 617 | } |
| 618 | s = t + 1; /* skip {part} */ |
| 619 | } |
| 620 | /* only admit to the alias if we used the db... */ |
| 621 | if(!used_db) { |
| 622 | *aliasp = 0; |
| 623 | return 0; |
| 624 | } |
| 625 | dynstr_terminate(&d); |
| 626 | /* ...and the answer differs from the original... */ |
| 627 | if(!strcmp(track, d.vec)) { |
| 628 | *aliasp = 0; |
| 629 | return 0; |
| 630 | } |
| 631 | /* ...and there isn't already a different track with that name (including as |
| 632 | * an alias) */ |
| 633 | switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) { |
| 634 | case 0: |
| 635 | if((s = kvp_get(at, "_alias_for")) |
| 636 | && !strcmp(s, track)) { |
| 637 | case DB_NOTFOUND: |
| 638 | *aliasp = d.vec; |
| 639 | } else { |
| 640 | *aliasp = 0; |
| 641 | } |
| 642 | return 0; |
| 643 | default: |
| 644 | return err; |
| 645 | } |
| 646 | } |
| 647 | |
| 648 | /* get track and prefs data (if tp/pp not null pointers). Returns 0 on |
| 649 | * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK. |
| 650 | * Always sets the return values, even if only to null pointers. */ |
| 651 | static int gettrackdata(const char *track, |
| 652 | struct kvp **tp, |
| 653 | struct kvp **pp, |
| 654 | const char **actualp, |
| 655 | unsigned flags, |
| 656 | #define GTD_NOALIAS 0x0001 |
| 657 | DB_TXN *tid) { |
| 658 | int err; |
| 659 | const char *actual = track; |
| 660 | struct kvp *t = 0, *p = 0; |
| 661 | |
| 662 | if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done; |
| 663 | if((actual = kvp_get(t, "_alias_for"))) { |
| 664 | if(flags & GTD_NOALIAS) { |
| 665 | error(0, "alias passed to gettrackdata where real path required"); |
| 666 | abort(); |
| 667 | } |
| 668 | if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done; |
| 669 | } else |
| 670 | actual = track; |
| 671 | assert(actual != 0); |
| 672 | if(pp) { |
| 673 | if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK) |
| 674 | goto done; |
| 675 | } |
| 676 | err = 0; |
| 677 | done: |
| 678 | if(actualp) *actualp = actual; |
| 679 | if(tp) *tp = t; |
| 680 | if(pp) *pp = p; |
| 681 | return err; |
| 682 | } |
| 683 | |
| 684 | /* trackdb_notice() **********************************************************/ |
| 685 | |
| 686 | /** @brief notice a possiby new track |
| 687 | * @return @c DB_NOTFOUND if new, 0 if already known |
| 688 | */ |
| 689 | int trackdb_notice(const char *track, |
| 690 | const char *path) { |
| 691 | int err; |
| 692 | DB_TXN *tid; |
| 693 | |
| 694 | for(;;) { |
| 695 | tid = trackdb_begin_transaction(); |
| 696 | err = trackdb_notice_tid(track, path, tid); |
| 697 | if((err == DB_LOCK_DEADLOCK)) goto fail; |
| 698 | break; |
| 699 | fail: |
| 700 | trackdb_abort_transaction(tid); |
| 701 | } |
| 702 | trackdb_commit_transaction(tid); |
| 703 | return err; |
| 704 | } |
| 705 | |
| 706 | /** @brief notice a possiby new track |
| 707 | * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also |
| 708 | */ |
| 709 | int trackdb_notice_tid(const char *track, |
| 710 | const char *path, |
| 711 | DB_TXN *tid) { |
| 712 | int err, n; |
| 713 | struct kvp *t, *a, *p; |
| 714 | int t_changed, ret; |
| 715 | char *alias, **w; |
| 716 | |
| 717 | /* notice whether the tracks.db entry changes */ |
| 718 | t_changed = 0; |
| 719 | /* get any existing tracks entry */ |
| 720 | if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK) |
| 721 | return err; |
| 722 | ret = err; /* 0 or DB_NOTFOUND */ |
| 723 | /* this is a real track */ |
| 724 | t_changed += kvp_set(&t, "_alias_for", 0); |
| 725 | t_changed += kvp_set(&t, "_path", path); |
| 726 | /* if we have an alias record it in the database */ |
| 727 | if((err = compute_alias(&alias, track, p, tid))) return err; |
| 728 | if(alias) { |
| 729 | /* won't overwrite someone else's alias as compute_alias() checks */ |
| 730 | D(("%s: alias %s", track, alias)); |
| 731 | a = 0; |
| 732 | kvp_set(&a, "_alias_for", track); |
| 733 | if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err; |
| 734 | } |
| 735 | /* update search.db */ |
| 736 | w = track_to_words(track, p); |
| 737 | for(n = 0; w[n]; ++n) |
| 738 | if((err = register_search_word(track, w[n], tid))) |
| 739 | return err; |
| 740 | /* update tags.db */ |
| 741 | w = parsetags(kvp_get(p, "tags")); |
| 742 | for(n = 0; w[n]; ++n) |
| 743 | if((err = register_tag(track, w[n], tid))) |
| 744 | return err; |
| 745 | reqtracks = 0; |
| 746 | /* only store the tracks.db entry if it has changed */ |
| 747 | if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))) |
| 748 | return err; |
| 749 | if(ret == DB_NOTFOUND) { |
| 750 | uint32_t timestamp[2]; |
| 751 | time_t now; |
| 752 | DBT key, data; |
| 753 | |
| 754 | time(&now); |
| 755 | timestamp[0] = htonl((uint64_t)now >> 32); |
| 756 | timestamp[1] = htonl((uint32_t)now); |
| 757 | memset(&key, 0, sizeof key); |
| 758 | key.data = timestamp; |
| 759 | key.size = sizeof timestamp; |
| 760 | switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key, |
| 761 | make_key(&data, track), 0)) { |
| 762 | case 0: break; |
| 763 | case DB_LOCK_DEADLOCK: return err; |
| 764 | default: fatal(0, "error updating noticed.db: %s", db_strerror(err)); |
| 765 | } |
| 766 | } |
| 767 | return ret; |
| 768 | } |
| 769 | |
| 770 | /* trackdb_obsolete() ********************************************************/ |
| 771 | |
| 772 | /* obsolete a track */ |
| 773 | int trackdb_obsolete(const char *track, DB_TXN *tid) { |
| 774 | int err, n; |
| 775 | struct kvp *p; |
| 776 | char *alias, **w; |
| 777 | |
| 778 | if((err = gettrackdata(track, 0, &p, 0, |
| 779 | GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK) |
| 780 | return err; |
| 781 | else if(err == DB_NOTFOUND) return 0; |
| 782 | /* compute the alias, if any, and delete it */ |
| 783 | if(compute_alias(&alias, track, p, tid)) return err; |
| 784 | if(alias) { |
| 785 | /* if the alias points to some other track then compute_alias won't |
| 786 | * return it */ |
| 787 | if(trackdb_delkey(trackdb_tracksdb, alias, tid)) |
| 788 | return err; |
| 789 | } |
| 790 | /* update search.db */ |
| 791 | w = track_to_words(track, p); |
| 792 | for(n = 0; w[n]; ++n) |
| 793 | if(trackdb_delkeydata(trackdb_searchdb, |
| 794 | w[n], track, tid) == DB_LOCK_DEADLOCK) |
| 795 | return err; |
| 796 | /* update tags.db */ |
| 797 | w = parsetags(kvp_get(p, "tags")); |
| 798 | for(n = 0; w[n]; ++n) |
| 799 | if(trackdb_delkeydata(trackdb_tagsdb, |
| 800 | w[n], track, tid) == DB_LOCK_DEADLOCK) |
| 801 | return err; |
| 802 | reqtracks = 0; |
| 803 | /* update tracks.db */ |
| 804 | if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK) |
| 805 | return err; |
| 806 | /* We don't delete the prefs, so they survive temporary outages of the |
| 807 | * (possibly virtual) track filesystem */ |
| 808 | return 0; |
| 809 | } |
| 810 | |
| 811 | /* trackdb_stats() ***********************************************************/ |
| 812 | |
| 813 | #define H(name) { #name, offsetof(DB_HASH_STAT, name) } |
| 814 | #define B(name) { #name, offsetof(DB_BTREE_STAT, name) } |
| 815 | |
| 816 | static const struct statinfo { |
| 817 | const char *name; |
| 818 | size_t offset; |
| 819 | } statinfo_hash[] = { |
| 820 | H(hash_magic), |
| 821 | H(hash_version), |
| 822 | H(hash_nkeys), |
| 823 | H(hash_ndata), |
| 824 | H(hash_pagesize), |
| 825 | H(hash_ffactor), |
| 826 | H(hash_buckets), |
| 827 | H(hash_free), |
| 828 | H(hash_bfree), |
| 829 | H(hash_bigpages), |
| 830 | H(hash_big_bfree), |
| 831 | H(hash_overflows), |
| 832 | H(hash_ovfl_free), |
| 833 | H(hash_dup), |
| 834 | H(hash_dup_free), |
| 835 | }, statinfo_btree[] = { |
| 836 | B(bt_magic), |
| 837 | B(bt_version), |
| 838 | B(bt_nkeys), |
| 839 | B(bt_ndata), |
| 840 | B(bt_pagesize), |
| 841 | B(bt_minkey), |
| 842 | B(bt_re_len), |
| 843 | B(bt_re_pad), |
| 844 | B(bt_levels), |
| 845 | B(bt_int_pg), |
| 846 | B(bt_leaf_pg), |
| 847 | B(bt_dup_pg), |
| 848 | B(bt_over_pg), |
| 849 | B(bt_free), |
| 850 | B(bt_int_pgfree), |
| 851 | B(bt_leaf_pgfree), |
| 852 | B(bt_dup_pgfree), |
| 853 | B(bt_over_pgfree), |
| 854 | }; |
| 855 | |
| 856 | /* look up stats for DB */ |
| 857 | static int get_stats(struct vector *v, |
| 858 | DB *database, |
| 859 | const struct statinfo *si, |
| 860 | size_t nsi, |
| 861 | DB_TXN *tid) { |
| 862 | void *sp; |
| 863 | size_t n; |
| 864 | char *str; |
| 865 | int err; |
| 866 | |
| 867 | if(database) { |
| 868 | switch(err = database->stat(database, tid, &sp, 0)) { |
| 869 | case 0: |
| 870 | break; |
| 871 | case DB_LOCK_DEADLOCK: |
| 872 | error(0, "error querying database: %s", db_strerror(err)); |
| 873 | return err; |
| 874 | default: |
| 875 | fatal(0, "error querying database: %s", db_strerror(err)); |
| 876 | } |
| 877 | for(n = 0; n < nsi; ++n) { |
| 878 | byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name, |
| 879 | (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset)); |
| 880 | vector_append(v, str); |
| 881 | } |
| 882 | } |
| 883 | return 0; |
| 884 | } |
| 885 | |
| 886 | struct search_entry { |
| 887 | char *word; |
| 888 | int n; |
| 889 | }; |
| 890 | |
| 891 | /* find the top COUNT words in the search database */ |
| 892 | static int search_league(struct vector *v, int count, DB_TXN *tid) { |
| 893 | struct search_entry *se; |
| 894 | DBT k, d; |
| 895 | DBC *cursor; |
| 896 | int err, n = 0, nse = 0, i; |
| 897 | char *word = 0; |
| 898 | size_t wl = 0; |
| 899 | char *str; |
| 900 | |
| 901 | cursor = trackdb_opencursor(trackdb_searchdb, tid); |
| 902 | se = xmalloc(count * sizeof *se); |
| 903 | while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d), |
| 904 | DB_NEXT))) { |
| 905 | if(word && wl == k.size && !strncmp(word, k.data, wl)) |
| 906 | ++n; |
| 907 | else { |
| 908 | #define FINALIZE() do { \ |
| 909 | if(word && (nse < count || n > se[nse - 1].n)) { \ |
| 910 | if(nse == count) \ |
| 911 | i = nse - 1; \ |
| 912 | else \ |
| 913 | i = nse++; \ |
| 914 | while(i > 0 && n > se[i - 1].n) \ |
| 915 | --i; \ |
| 916 | memmove(&se[i + 1], &se[i], (nse - i) * sizeof *se); \ |
| 917 | se[i].word = word; \ |
| 918 | se[i].n = n; \ |
| 919 | } \ |
| 920 | } while(0) |
| 921 | FINALIZE(); |
| 922 | word = xstrndup(k.data, wl = k.size); |
| 923 | n = 1; |
| 924 | } |
| 925 | } |
| 926 | switch(err) { |
| 927 | case DB_NOTFOUND: |
| 928 | err = 0; |
| 929 | break; |
| 930 | case DB_LOCK_DEADLOCK: |
| 931 | error(0, "error querying search database: %s", db_strerror(err)); |
| 932 | break; |
| 933 | default: |
| 934 | fatal(0, "error querying search database: %s", db_strerror(err)); |
| 935 | } |
| 936 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; |
| 937 | if(err) return err; |
| 938 | FINALIZE(); |
| 939 | byte_xasprintf(&str, "Top %d search words:", nse); |
| 940 | vector_append(v, str); |
| 941 | for(i = 0; i < nse; ++i) { |
| 942 | byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word); |
| 943 | vector_append(v, str); |
| 944 | } |
| 945 | return 0; |
| 946 | } |
| 947 | |
| 948 | #define SI(what) statinfo_##what, \ |
| 949 | sizeof statinfo_##what / sizeof (struct statinfo) |
| 950 | |
| 951 | /* return a list of database stats */ |
| 952 | char **trackdb_stats(int *nstatsp) { |
| 953 | DB_TXN *tid; |
| 954 | struct vector v; |
| 955 | char *s; |
| 956 | |
| 957 | vector_init(&v); |
| 958 | for(;;) { |
| 959 | tid = trackdb_begin_transaction(); |
| 960 | v.nvec = 0; |
| 961 | vector_append(&v, (char *)"Tracks database stats:"); |
| 962 | if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail; |
| 963 | vector_append(&v, (char *)""); |
| 964 | vector_append(&v, (char *)"Search database stats:"); |
| 965 | if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail; |
| 966 | vector_append(&v, (char *)""); |
| 967 | vector_append(&v, (char *)"Prefs database stats:"); |
| 968 | if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail; |
| 969 | vector_append(&v, (char *)""); |
| 970 | if(search_league(&v, 10, tid)) goto fail; |
| 971 | vector_append(&v, (char *)""); |
| 972 | vector_append(&v, (char *)"Server stats:"); |
| 973 | byte_xasprintf(&s, "track lookup cache hits: %lu", cache_files_hits); |
| 974 | vector_append(&v, (char *)s); |
| 975 | byte_xasprintf(&s, "track lookup cache misses: %lu", cache_files_misses); |
| 976 | vector_append(&v, (char *)s); |
| 977 | vector_terminate(&v); |
| 978 | break; |
| 979 | fail: |
| 980 | trackdb_abort_transaction(tid); |
| 981 | } |
| 982 | trackdb_commit_transaction(tid); |
| 983 | if(nstatsp) *nstatsp = v.nvec; |
| 984 | return v.vec; |
| 985 | } |
| 986 | |
| 987 | /* set a pref (remove if value=0) */ |
| 988 | int trackdb_set(const char *track, |
| 989 | const char *name, |
| 990 | const char *value) { |
| 991 | struct kvp *t, *p, *a; |
| 992 | DB_TXN *tid; |
| 993 | int err, cmp; |
| 994 | char *oldalias, *newalias, **oldtags = 0, **newtags; |
| 995 | |
| 996 | if(value) { |
| 997 | /* TODO: if value matches default then set value=0 */ |
| 998 | } |
| 999 | |
| 1000 | for(;;) { |
| 1001 | tid = trackdb_begin_transaction(); |
| 1002 | if((err = gettrackdata(track, &t, &p, 0, |
| 1003 | 0, tid)) == DB_LOCK_DEADLOCK) |
| 1004 | goto fail; |
| 1005 | if(err == DB_NOTFOUND) break; |
| 1006 | if(name[0] == '_') { |
| 1007 | if(kvp_set(&t, name, value)) |
| 1008 | if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)) |
| 1009 | goto fail; |
| 1010 | } else { |
| 1011 | /* get the old alias name */ |
| 1012 | if(compute_alias(&oldalias, track, p, tid)) goto fail; |
| 1013 | /* get the old tags */ |
| 1014 | if(!strcmp(name, "tags")) |
| 1015 | oldtags = parsetags(kvp_get(p, "tags")); |
| 1016 | /* set the value */ |
| 1017 | if(kvp_set(&p, name, value)) |
| 1018 | if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0)) |
| 1019 | goto fail; |
| 1020 | /* compute the new alias name */ |
| 1021 | if((err = compute_alias(&newalias, track, p, tid))) goto fail; |
| 1022 | /* check whether alias has changed */ |
| 1023 | if(!(oldalias == newalias |
| 1024 | || (oldalias && newalias && !strcmp(oldalias, newalias)))) { |
| 1025 | /* adjust alias records to fit change */ |
| 1026 | if(oldalias |
| 1027 | && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail; |
| 1028 | if(newalias) { |
| 1029 | a = 0; |
| 1030 | kvp_set(&a, "_alias_for", track); |
| 1031 | if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail; |
| 1032 | } |
| 1033 | } |
| 1034 | /* check whether tags have changed */ |
| 1035 | if(!strcmp(name, "tags")) { |
| 1036 | newtags = parsetags(value); |
| 1037 | while(*oldtags || *newtags) { |
| 1038 | if(*oldtags && *newtags) { |
| 1039 | cmp = strcmp(*oldtags, *newtags); |
| 1040 | if(!cmp) { |
| 1041 | /* keeping this tag */ |
| 1042 | ++oldtags; |
| 1043 | ++newtags; |
| 1044 | } else if(cmp < 0) |
| 1045 | /* old tag fits into a gap in the new list, so delete old */ |
| 1046 | goto delete_old; |
| 1047 | else |
| 1048 | /* new tag fits into a gap in the old list, so insert new */ |
| 1049 | goto insert_new; |
| 1050 | } else if(*oldtags) { |
| 1051 | /* we've run out of new tags, so remaining old ones are to be |
| 1052 | * deleted */ |
| 1053 | delete_old: |
| 1054 | if(trackdb_delkeydata(trackdb_tagsdb, |
| 1055 | *oldtags, track, tid) == DB_LOCK_DEADLOCK) |
| 1056 | goto fail; |
| 1057 | ++oldtags; |
| 1058 | } else { |
| 1059 | /* we've run out of old tags, so remainig new ones are to be |
| 1060 | * inserted */ |
| 1061 | insert_new: |
| 1062 | if(register_tag(track, *newtags, tid)) goto fail; |
| 1063 | ++newtags; |
| 1064 | } |
| 1065 | } |
| 1066 | reqtracks = 0; |
| 1067 | } |
| 1068 | } |
| 1069 | err = 0; |
| 1070 | break; |
| 1071 | fail: |
| 1072 | trackdb_abort_transaction(tid); |
| 1073 | } |
| 1074 | trackdb_commit_transaction(tid); |
| 1075 | return err == 0 ? 0 : -1; |
| 1076 | } |
| 1077 | |
| 1078 | /* get a pref */ |
| 1079 | const char *trackdb_get(const char *track, |
| 1080 | const char *name) { |
| 1081 | return kvp_get(trackdb_get_all(track), name); |
| 1082 | } |
| 1083 | |
| 1084 | /* get all prefs as a 0-terminated array */ |
| 1085 | struct kvp *trackdb_get_all(const char *track) { |
| 1086 | struct kvp *t, *p, **pp; |
| 1087 | DB_TXN *tid; |
| 1088 | |
| 1089 | for(;;) { |
| 1090 | tid = trackdb_begin_transaction(); |
| 1091 | if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK) |
| 1092 | goto fail; |
| 1093 | break; |
| 1094 | fail: |
| 1095 | trackdb_abort_transaction(tid); |
| 1096 | } |
| 1097 | trackdb_commit_transaction(tid); |
| 1098 | for(pp = &p; *pp; pp = &(*pp)->next) |
| 1099 | ; |
| 1100 | *pp = t; |
| 1101 | return p; |
| 1102 | } |
| 1103 | |
| 1104 | /* resolve alias */ |
| 1105 | const char *trackdb_resolve(const char *track) { |
| 1106 | DB_TXN *tid; |
| 1107 | const char *actual; |
| 1108 | |
| 1109 | for(;;) { |
| 1110 | tid = trackdb_begin_transaction(); |
| 1111 | if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK) |
| 1112 | goto fail; |
| 1113 | break; |
| 1114 | fail: |
| 1115 | trackdb_abort_transaction(tid); |
| 1116 | } |
| 1117 | trackdb_commit_transaction(tid); |
| 1118 | return actual; |
| 1119 | } |
| 1120 | |
| 1121 | int trackdb_isalias(const char *track) { |
| 1122 | const char *actual = trackdb_resolve(track); |
| 1123 | |
| 1124 | return strcmp(actual, track); |
| 1125 | } |
| 1126 | |
| 1127 | /* test whether a track exists (perhaps an alias) */ |
| 1128 | int trackdb_exists(const char *track) { |
| 1129 | DB_TXN *tid; |
| 1130 | int err; |
| 1131 | |
| 1132 | for(;;) { |
| 1133 | tid = trackdb_begin_transaction(); |
| 1134 | /* unusually, here we want the return value */ |
| 1135 | if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK) |
| 1136 | goto fail; |
| 1137 | break; |
| 1138 | fail: |
| 1139 | trackdb_abort_transaction(tid); |
| 1140 | } |
| 1141 | trackdb_commit_transaction(tid); |
| 1142 | return (err == 0); |
| 1143 | } |
| 1144 | |
| 1145 | /* return the list of tags */ |
| 1146 | char **trackdb_alltags(void) { |
| 1147 | DB_TXN *tid; |
| 1148 | int err; |
| 1149 | char **taglist; |
| 1150 | |
| 1151 | for(;;) { |
| 1152 | tid = trackdb_begin_transaction(); |
| 1153 | err = trackdb_alltags_tid(tid, &taglist); |
| 1154 | if(!err) break; |
| 1155 | trackdb_abort_transaction(tid); |
| 1156 | } |
| 1157 | trackdb_commit_transaction(tid); |
| 1158 | return taglist; |
| 1159 | } |
| 1160 | |
| 1161 | static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) { |
| 1162 | struct vector v; |
| 1163 | DBC *c; |
| 1164 | DBT k, d; |
| 1165 | int err; |
| 1166 | |
| 1167 | vector_init(&v); |
| 1168 | c = trackdb_opencursor(trackdb_tagsdb, tid); |
| 1169 | memset(&k, 0, sizeof k); |
| 1170 | while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP))) |
| 1171 | vector_append(&v, xstrndup(k.data, k.size)); |
| 1172 | switch(err) { |
| 1173 | case DB_NOTFOUND: |
| 1174 | break; |
| 1175 | case DB_LOCK_DEADLOCK: |
| 1176 | return err; |
| 1177 | default: |
| 1178 | fatal(0, "c->c_get: %s", db_strerror(err)); |
| 1179 | } |
| 1180 | if((err = trackdb_closecursor(c))) return err; |
| 1181 | vector_terminate(&v); |
| 1182 | *taglistp = v.vec; |
| 1183 | return 0; |
| 1184 | } |
| 1185 | |
| 1186 | /* return 1 iff sorted tag lists A and B have at least one member in common */ |
| 1187 | static int tag_intersection(char **a, char **b) { |
| 1188 | int cmp; |
| 1189 | |
| 1190 | /* Same sort of logic as trackdb_set() above */ |
| 1191 | while(*a && *b) { |
| 1192 | if(!(cmp = strcmp(*a, *b))) return 1; |
| 1193 | else if(cmp < 0) ++a; |
| 1194 | else ++b; |
| 1195 | } |
| 1196 | return 0; |
| 1197 | } |
| 1198 | |
| 1199 | /* Check whether a track is suitable for random play. Returns 0 if it is, |
| 1200 | * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us |
| 1201 | * that. */ |
| 1202 | static int check_suitable(const char *track, |
| 1203 | DB_TXN *tid, |
| 1204 | char **required_tags, |
| 1205 | char **prohibited_tags) { |
| 1206 | char **track_tags; |
| 1207 | time_t last, now; |
| 1208 | struct kvp *p, *t; |
| 1209 | const char *pick_at_random, *played_time; |
| 1210 | |
| 1211 | /* don't pick tracks that aren't in any surviving collection (for instance |
| 1212 | * you've edited the config but the rescan hasn't done its job yet) */ |
| 1213 | if(!find_track_root(track)) { |
| 1214 | info("found track not in any collection: %s", track); |
| 1215 | return DB_NOTFOUND; |
| 1216 | } |
| 1217 | /* don't pick aliases - only pick the canonical form */ |
| 1218 | if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK) |
| 1219 | return DB_LOCK_DEADLOCK; |
| 1220 | if(kvp_get(t, "_alias_for")) |
| 1221 | return DB_NOTFOUND; |
| 1222 | /* check that random play is not suppressed for this track */ |
| 1223 | if((pick_at_random = kvp_get(p, "pick_at_random")) |
| 1224 | && !strcmp(pick_at_random, "0")) |
| 1225 | return DB_NOTFOUND; |
| 1226 | /* don't pick a track that's been played in the last 8 hours */ |
| 1227 | if((played_time = kvp_get(p, "played_time"))) { |
| 1228 | last = atoll(played_time); |
| 1229 | now = time(0); |
| 1230 | if(now < last + 8 * 3600) /* TODO configurable */ |
| 1231 | return DB_NOTFOUND; |
| 1232 | } |
| 1233 | track_tags = parsetags(kvp_get(p, "tags")); |
| 1234 | /* check that no prohibited tag is present for this track */ |
| 1235 | if(prohibited_tags && tag_intersection(track_tags, prohibited_tags)) |
| 1236 | return DB_NOTFOUND; |
| 1237 | /* check that at least one required tags is present for this track */ |
| 1238 | if(*required_tags && !tag_intersection(track_tags, required_tags)) |
| 1239 | return DB_NOTFOUND; |
| 1240 | return 0; |
| 1241 | } |
| 1242 | |
| 1243 | /* attempt to pick a random non-alias track */ |
| 1244 | const char *trackdb_random(int tries) { |
| 1245 | DBT key, data; |
| 1246 | DB_BTREE_STAT *sp; |
| 1247 | int err, n; |
| 1248 | DB_TXN *tid; |
| 1249 | const char *track, *candidate; |
| 1250 | db_recno_t r; |
| 1251 | const char *tags; |
| 1252 | char **required_tags, **prohibited_tags, **tp; |
| 1253 | hash *h; |
| 1254 | DBC *c = 0; |
| 1255 | |
| 1256 | for(;;) { |
| 1257 | tid = trackdb_begin_transaction(); |
| 1258 | if((err = trackdb_get_global_tid("required-tags", tid, &tags))) |
| 1259 | goto fail; |
| 1260 | required_tags = parsetags(tags); |
| 1261 | if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags))) |
| 1262 | goto fail; |
| 1263 | prohibited_tags = parsetags(tags); |
| 1264 | track = 0; |
| 1265 | if(*required_tags) { |
| 1266 | /* Bung all the suitable tracks into a hash and convert to a list of keys |
| 1267 | * (to eliminate duplicates). We cache this list since it is possible |
| 1268 | * that it will be very large. */ |
| 1269 | if(!reqtracks) { |
| 1270 | h = hash_new(0); |
| 1271 | for(tp = required_tags; *tp; ++tp) { |
| 1272 | c = trackdb_opencursor(trackdb_tagsdb, tid); |
| 1273 | memset(&key, 0, sizeof key); |
| 1274 | key.data = *tp; |
| 1275 | key.size = strlen(*tp); |
| 1276 | n = 0; |
| 1277 | err = c->c_get(c, &key, prepare_data(&data), DB_SET); |
| 1278 | while(err == 0) { |
| 1279 | hash_add(h, xstrndup(data.data, data.size), 0, |
| 1280 | HASH_INSERT_OR_REPLACE); |
| 1281 | ++n; |
| 1282 | err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP); |
| 1283 | } |
| 1284 | switch(err) { |
| 1285 | case 0: |
| 1286 | case DB_NOTFOUND: |
| 1287 | break; |
| 1288 | case DB_LOCK_DEADLOCK: |
| 1289 | goto fail; |
| 1290 | default: |
| 1291 | fatal(0, "error querying tags.db: %s", db_strerror(err)); |
| 1292 | } |
| 1293 | trackdb_closecursor(c); |
| 1294 | c = 0; |
| 1295 | if(!n) |
| 1296 | error(0, "required tag %s does not match any tracks", *tp); |
| 1297 | } |
| 1298 | nreqtracks = hash_count(h); |
| 1299 | reqtracks = hash_keys(h); |
| 1300 | } |
| 1301 | while(nreqtracks && !track && tries-- > 0) { |
| 1302 | r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0)); |
| 1303 | candidate = reqtracks[r]; |
| 1304 | switch(check_suitable(candidate, tid, |
| 1305 | required_tags, prohibited_tags)) { |
| 1306 | case 0: |
| 1307 | track = candidate; |
| 1308 | break; |
| 1309 | case DB_NOTFOUND: |
| 1310 | break; |
| 1311 | case DB_LOCK_DEADLOCK: |
| 1312 | goto fail; |
| 1313 | } |
| 1314 | } |
| 1315 | } else { |
| 1316 | /* No required tags. We pick random record numbers in the database |
| 1317 | * instead. */ |
| 1318 | switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) { |
| 1319 | case 0: |
| 1320 | break; |
| 1321 | case DB_LOCK_DEADLOCK: |
| 1322 | error(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1323 | goto fail; |
| 1324 | default: |
| 1325 | fatal(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1326 | } |
| 1327 | if(!sp->bt_nkeys) |
| 1328 | error(0, "cannot pick tracks at random from an empty database"); |
| 1329 | while(sp->bt_nkeys && !track && tries-- > 0) { |
| 1330 | /* record numbers count from 1 upwards */ |
| 1331 | r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0)); |
| 1332 | memset(&key, sizeof key, 0); |
| 1333 | key.flags = DB_DBT_MALLOC; |
| 1334 | key.size = sizeof r; |
| 1335 | key.data = &r; |
| 1336 | switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data), |
| 1337 | DB_SET_RECNO)) { |
| 1338 | case 0: |
| 1339 | break; |
| 1340 | case DB_LOCK_DEADLOCK: |
| 1341 | error(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1342 | goto fail; |
| 1343 | default: |
| 1344 | fatal(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1345 | } |
| 1346 | candidate = xstrndup(key.data, key.size); |
| 1347 | switch(check_suitable(candidate, tid, |
| 1348 | required_tags, prohibited_tags)) { |
| 1349 | case 0: |
| 1350 | track = candidate; |
| 1351 | break; |
| 1352 | case DB_NOTFOUND: |
| 1353 | break; |
| 1354 | case DB_LOCK_DEADLOCK: |
| 1355 | goto fail; |
| 1356 | } |
| 1357 | } |
| 1358 | } |
| 1359 | break; |
| 1360 | fail: |
| 1361 | trackdb_closecursor(c); |
| 1362 | c = 0; |
| 1363 | trackdb_abort_transaction(tid); |
| 1364 | } |
| 1365 | trackdb_commit_transaction(tid); |
| 1366 | if(!track) |
| 1367 | error(0, "could not pick a random track"); |
| 1368 | return track; |
| 1369 | } |
| 1370 | |
| 1371 | /* get a track name given the prefs. Set *used_db to 1 if we got the answer |
| 1372 | * from the prefs. */ |
| 1373 | static const char *getpart(const char *track, |
| 1374 | const char *context, |
| 1375 | const char *part, |
| 1376 | const struct kvp *p, |
| 1377 | int *used_db) { |
| 1378 | const char *result; |
| 1379 | char *pref; |
| 1380 | |
| 1381 | byte_xasprintf(&pref, "trackname_%s_%s", context, part); |
| 1382 | if((result = kvp_get(p, pref))) |
| 1383 | *used_db = 1; |
| 1384 | else |
| 1385 | result = trackname_part(track, context, part); |
| 1386 | assert(result != 0); |
| 1387 | return result; |
| 1388 | } |
| 1389 | |
| 1390 | /* get a track name part, like trackname_part(), but taking the database into |
| 1391 | * account. */ |
| 1392 | const char *trackdb_getpart(const char *track, |
| 1393 | const char *context, |
| 1394 | const char *part) { |
| 1395 | struct kvp *p; |
| 1396 | DB_TXN *tid; |
| 1397 | char *pref; |
| 1398 | const char *actual; |
| 1399 | int used_db, err; |
| 1400 | |
| 1401 | /* construct the full pref */ |
| 1402 | byte_xasprintf(&pref, "trackname_%s_%s", context, part); |
| 1403 | for(;;) { |
| 1404 | tid = trackdb_begin_transaction(); |
| 1405 | if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK) |
| 1406 | goto fail; |
| 1407 | break; |
| 1408 | fail: |
| 1409 | trackdb_abort_transaction(tid); |
| 1410 | } |
| 1411 | trackdb_commit_transaction(tid); |
| 1412 | return getpart(actual, context, part, p, &used_db); |
| 1413 | } |
| 1414 | |
| 1415 | /* get the raw path name for @track@ (might be an alias) */ |
| 1416 | const char *trackdb_rawpath(const char *track) { |
| 1417 | DB_TXN *tid; |
| 1418 | struct kvp *t; |
| 1419 | const char *path; |
| 1420 | |
| 1421 | for(;;) { |
| 1422 | tid = trackdb_begin_transaction(); |
| 1423 | if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK) |
| 1424 | goto fail; |
| 1425 | break; |
| 1426 | fail: |
| 1427 | trackdb_abort_transaction(tid); |
| 1428 | } |
| 1429 | trackdb_commit_transaction(tid); |
| 1430 | if(!(path = kvp_get(t, "_path"))) path = track; |
| 1431 | return path; |
| 1432 | } |
| 1433 | |
| 1434 | /* trackdb_list **************************************************************/ |
| 1435 | |
| 1436 | /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually |
| 1437 | * readable at some point */ |
| 1438 | |
| 1439 | /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE. |
| 1440 | * If RE is a null pointer then it matches everything. */ |
| 1441 | static int track_matches(size_t dl, const char *track, size_t tl, |
| 1442 | const pcre *re) { |
| 1443 | int ovec[3], rc; |
| 1444 | |
| 1445 | if(!re) |
| 1446 | return 1; |
| 1447 | track += dl + 1; |
| 1448 | tl -= (dl + 1); |
| 1449 | switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) { |
| 1450 | case PCRE_ERROR_NOMATCH: return 0; |
| 1451 | default: |
| 1452 | if(rc < 0) { |
| 1453 | error(0, "pcre_exec returned %d, subject '%s'", rc, track); |
| 1454 | return 0; |
| 1455 | } |
| 1456 | return 1; |
| 1457 | } |
| 1458 | } |
| 1459 | |
| 1460 | static int do_list(struct vector *v, const char *dir, |
| 1461 | enum trackdb_listable what, const pcre *re, DB_TXN *tid) { |
| 1462 | DBC *cursor; |
| 1463 | DBT k, d; |
| 1464 | size_t dl; |
| 1465 | char *ptr; |
| 1466 | int err; |
| 1467 | size_t l, last_dir_len = 0; |
| 1468 | char *last_dir = 0, *track, *alias; |
| 1469 | struct kvp *p; |
| 1470 | |
| 1471 | dl = strlen(dir); |
| 1472 | cursor = trackdb_opencursor(trackdb_tracksdb, tid); |
| 1473 | make_key(&k, dir); |
| 1474 | prepare_data(&d); |
| 1475 | /* find the first key >= dir */ |
| 1476 | err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE); |
| 1477 | /* keep going while we're dealing with <dir/anything> */ |
| 1478 | while(err == 0 |
| 1479 | && k.size > dl |
| 1480 | && ((char *)k.data)[dl] == '/' |
| 1481 | && !memcmp(k.data, dir, dl)) { |
| 1482 | ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1)); |
| 1483 | if(ptr) { |
| 1484 | /* we have <dir/component/anything>, so <dir/component> is a directory */ |
| 1485 | l = ptr - (char *)k.data; |
| 1486 | if(what & trackdb_directories) |
| 1487 | if(!(last_dir |
| 1488 | && l == last_dir_len |
| 1489 | && !memcmp(last_dir, k.data, l))) { |
| 1490 | last_dir = xstrndup(k.data, last_dir_len = l); |
| 1491 | if(track_matches(dl, k.data, l, re)) |
| 1492 | vector_append(v, last_dir); |
| 1493 | } |
| 1494 | } else { |
| 1495 | /* found a plain file */ |
| 1496 | if((what & trackdb_files)) { |
| 1497 | track = xstrndup(k.data, k.size); |
| 1498 | if((err = trackdb_getdata(trackdb_prefsdb, |
| 1499 | track, &p, tid)) == DB_LOCK_DEADLOCK) |
| 1500 | goto deadlocked; |
| 1501 | /* if this file has an alias in the same directory then we skip it */ |
| 1502 | if((err = compute_alias(&alias, track, p, tid))) |
| 1503 | goto deadlocked; |
| 1504 | if(!(alias && !strcmp(d_dirname(alias), d_dirname(track)))) |
| 1505 | if(track_matches(dl, k.data, k.size, re)) |
| 1506 | vector_append(v, track); |
| 1507 | } |
| 1508 | } |
| 1509 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); |
| 1510 | } |
| 1511 | switch(err) { |
| 1512 | case 0: |
| 1513 | break; |
| 1514 | case DB_NOTFOUND: |
| 1515 | err = 0; |
| 1516 | break; |
| 1517 | case DB_LOCK_DEADLOCK: |
| 1518 | error(0, "error querying database: %s", db_strerror(err)); |
| 1519 | break; |
| 1520 | default: |
| 1521 | fatal(0, "error querying database: %s", db_strerror(err)); |
| 1522 | } |
| 1523 | deadlocked: |
| 1524 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; |
| 1525 | return err; |
| 1526 | } |
| 1527 | |
| 1528 | /* return the directories or files below @dir@ */ |
| 1529 | char **trackdb_list(const char *dir, int *np, enum trackdb_listable what, |
| 1530 | const pcre *re) { |
| 1531 | DB_TXN *tid; |
| 1532 | int n; |
| 1533 | struct vector v; |
| 1534 | |
| 1535 | vector_init(&v); |
| 1536 | for(;;) { |
| 1537 | tid = trackdb_begin_transaction(); |
| 1538 | v.nvec = 0; |
| 1539 | if(dir) { |
| 1540 | if(do_list(&v, dir, what, re, tid)) |
| 1541 | goto fail; |
| 1542 | } else { |
| 1543 | for(n = 0; n < config->collection.n; ++n) |
| 1544 | if(do_list(&v, config->collection.s[n].root, what, re, tid)) |
| 1545 | goto fail; |
| 1546 | } |
| 1547 | break; |
| 1548 | fail: |
| 1549 | trackdb_abort_transaction(tid); |
| 1550 | } |
| 1551 | trackdb_commit_transaction(tid); |
| 1552 | vector_terminate(&v); |
| 1553 | if(np) |
| 1554 | *np = v.nvec; |
| 1555 | return v.vec; |
| 1556 | } |
| 1557 | |
| 1558 | /* If S is tag:something, return something. Else return 0. */ |
| 1559 | static const char *checktag(const char *s) { |
| 1560 | if(!strncmp(s, "tag:", 4)) |
| 1561 | return s + 4; |
| 1562 | else |
| 1563 | return 0; |
| 1564 | } |
| 1565 | |
| 1566 | /* return a list of tracks containing all of the words given. If you |
| 1567 | * ask for only stopwords you get no tracks. */ |
| 1568 | char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) { |
| 1569 | const char **w, *best = 0, *tag; |
| 1570 | char **twords, **tags; |
| 1571 | int i, j, n, err, what; |
| 1572 | DBC *cursor = 0; |
| 1573 | DBT k, d; |
| 1574 | struct vector u, v; |
| 1575 | DB_TXN *tid; |
| 1576 | struct kvp *p; |
| 1577 | int ntags = 0; |
| 1578 | DB *db; |
| 1579 | const char *dbname; |
| 1580 | |
| 1581 | *ntracks = 0; /* for early returns */ |
| 1582 | /* casefold all the words */ |
| 1583 | w = xmalloc(nwordlist * sizeof (char *)); |
| 1584 | for(n = 0; n < nwordlist; ++n) { |
| 1585 | w[n] = casefold(wordlist[n]); |
| 1586 | if(checktag(w[n])) ++ntags; /* count up tags */ |
| 1587 | } |
| 1588 | /* find the longest non-stopword */ |
| 1589 | for(n = 0; n < nwordlist; ++n) |
| 1590 | if(!stopword(w[n]) && !checktag(w[n])) |
| 1591 | if(!best || strlen(w[n]) > strlen(best)) |
| 1592 | best = w[n]; |
| 1593 | /* TODO: we should at least in principal be able to identify the word or tag |
| 1594 | * with the least matches in log time, and choose that as our primary search |
| 1595 | * term. */ |
| 1596 | if(ntags && !best) { |
| 1597 | /* Only tags are listed. We limit to the first and narrow down with the |
| 1598 | * rest. */ |
| 1599 | best = checktag(w[0]); |
| 1600 | db = trackdb_tagsdb; |
| 1601 | dbname = "tags"; |
| 1602 | } else if(best) { |
| 1603 | /* We can limit to some word. */ |
| 1604 | db = trackdb_searchdb; |
| 1605 | dbname = "search"; |
| 1606 | } else { |
| 1607 | /* Only stopwords */ |
| 1608 | return 0; |
| 1609 | } |
| 1610 | vector_init(&u); |
| 1611 | vector_init(&v); |
| 1612 | for(;;) { |
| 1613 | tid = trackdb_begin_transaction(); |
| 1614 | /* find all the tracks that have that word */ |
| 1615 | make_key(&k, best); |
| 1616 | prepare_data(&d); |
| 1617 | what = DB_SET; |
| 1618 | v.nvec = 0; |
| 1619 | cursor = trackdb_opencursor(db, tid); |
| 1620 | while(!(err = cursor->c_get(cursor, &k, &d, what))) { |
| 1621 | vector_append(&v, xstrndup(d.data, d.size)); |
| 1622 | what = DB_NEXT_DUP; |
| 1623 | } |
| 1624 | switch(err) { |
| 1625 | case DB_NOTFOUND: |
| 1626 | err = 0; |
| 1627 | break; |
| 1628 | case DB_LOCK_DEADLOCK: |
| 1629 | error(0, "error querying %s database: %s", dbname, db_strerror(err)); |
| 1630 | break; |
| 1631 | default: |
| 1632 | fatal(0, "error querying %s database: %s", dbname, db_strerror(err)); |
| 1633 | } |
| 1634 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; |
| 1635 | cursor = 0; |
| 1636 | /* do a naive search over that (hopefuly fairly small) list of tracks */ |
| 1637 | u.nvec = 0; |
| 1638 | for(n = 0; n < v.nvec; ++n) { |
| 1639 | if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)) |
| 1640 | goto fail; |
| 1641 | else if(err) { |
| 1642 | error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err)); |
| 1643 | continue; |
| 1644 | } |
| 1645 | twords = track_to_words(v.vec[n], p); |
| 1646 | tags = parsetags(kvp_get(p, "tags")); |
| 1647 | for(i = 0; i < nwordlist; ++i) { |
| 1648 | if((tag = checktag(w[i]))) { |
| 1649 | /* Track must have this tag */ |
| 1650 | for(j = 0; tags[j]; ++j) |
| 1651 | if(!strcmp(tag, tags[j])) break; /* tag found */ |
| 1652 | if(!tags[j]) break; /* tag not found */ |
| 1653 | } else { |
| 1654 | /* Track must contain this word */ |
| 1655 | for(j = 0; twords[j]; ++j) |
| 1656 | if(!strcmp(w[i], twords[j])) break; /* word found */ |
| 1657 | if(!twords[j]) break; /* word not found */ |
| 1658 | } |
| 1659 | } |
| 1660 | if(i >= nwordlist) /* all words found */ |
| 1661 | vector_append(&u, v.vec[n]); |
| 1662 | } |
| 1663 | break; |
| 1664 | fail: |
| 1665 | trackdb_closecursor(cursor); |
| 1666 | cursor = 0; |
| 1667 | trackdb_abort_transaction(tid); |
| 1668 | info("retrying search"); |
| 1669 | } |
| 1670 | trackdb_commit_transaction(tid); |
| 1671 | vector_terminate(&u); |
| 1672 | if(ntracks) |
| 1673 | *ntracks = u.nvec; |
| 1674 | return u.vec; |
| 1675 | } |
| 1676 | |
| 1677 | /* trackdb_scan **************************************************************/ |
| 1678 | |
| 1679 | int trackdb_scan(const char *root, |
| 1680 | int (*callback)(const char *track, |
| 1681 | struct kvp *data, |
| 1682 | void *u, |
| 1683 | DB_TXN *tid), |
| 1684 | void *u, |
| 1685 | DB_TXN *tid) { |
| 1686 | DBC *cursor; |
| 1687 | DBT k, d; |
| 1688 | const size_t root_len = root ? strlen(root) : 0; |
| 1689 | int err, cberr; |
| 1690 | struct kvp *data; |
| 1691 | const char *track; |
| 1692 | |
| 1693 | cursor = trackdb_opencursor(trackdb_tracksdb, tid); |
| 1694 | if(root) |
| 1695 | err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d), |
| 1696 | DB_SET_RANGE); |
| 1697 | else { |
| 1698 | memset(&k, 0, sizeof k); |
| 1699 | err = cursor->c_get(cursor, &k, prepare_data(&d), |
| 1700 | DB_FIRST); |
| 1701 | } |
| 1702 | while(!err) { |
| 1703 | if(!root |
| 1704 | || (k.size > root_len |
| 1705 | && !strncmp(k.data, root, root_len) |
| 1706 | && ((char *)k.data)[root_len] == '/')) { |
| 1707 | data = kvp_urldecode(d.data, d.size); |
| 1708 | if(kvp_get(data, "_path")) { |
| 1709 | track = xstrndup(k.data, k.size); |
| 1710 | /* Advance to the next track before the callback so that the callback |
| 1711 | * may safely delete the track */ |
| 1712 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); |
| 1713 | if((cberr = callback(track, data, u, tid))) { |
| 1714 | err = cberr; |
| 1715 | break; |
| 1716 | } |
| 1717 | } else |
| 1718 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); |
| 1719 | } else |
| 1720 | break; |
| 1721 | } |
| 1722 | trackdb_closecursor(cursor); |
| 1723 | switch(err) { |
| 1724 | case EINTR: |
| 1725 | return err; |
| 1726 | case 0: |
| 1727 | case DB_NOTFOUND: |
| 1728 | return 0; |
| 1729 | case DB_LOCK_DEADLOCK: |
| 1730 | error(0, "c->c_get: %s", db_strerror(err)); |
| 1731 | return err; |
| 1732 | default: |
| 1733 | fatal(0, "c->c_get: %s", db_strerror(err)); |
| 1734 | } |
| 1735 | } |
| 1736 | |
| 1737 | /* trackdb_rescan ************************************************************/ |
| 1738 | |
| 1739 | /* called when the rescanner terminates */ |
| 1740 | static int reap_rescan(ev_source attribute((unused)) *ev, |
| 1741 | pid_t pid, |
| 1742 | int status, |
| 1743 | const struct rusage attribute((unused)) *rusage, |
| 1744 | void attribute((unused)) *u) { |
| 1745 | if(pid == rescan_pid) rescan_pid = -1; |
| 1746 | if(status) |
| 1747 | error(0, "disorderd-rescan: %s", wstat(status)); |
| 1748 | else |
| 1749 | D(("disorderd-rescan terminate: %s", wstat(status))); |
| 1750 | /* Our cache of file lookups is out of date now */ |
| 1751 | cache_clean(&cache_files_type); |
| 1752 | eventlog("rescanned", (char *)0); |
| 1753 | return 0; |
| 1754 | } |
| 1755 | |
| 1756 | void trackdb_rescan(ev_source *ev) { |
| 1757 | if(rescan_pid != -1) { |
| 1758 | error(0, "rescan already underway"); |
| 1759 | return; |
| 1760 | } |
| 1761 | rescan_pid = subprogram(ev, RESCAN); |
| 1762 | ev_child(ev, rescan_pid, 0, reap_rescan, 0); |
| 1763 | D(("started rescanner")); |
| 1764 | |
| 1765 | } |
| 1766 | |
| 1767 | int trackdb_rescan_cancel(void) { |
| 1768 | if(rescan_pid == -1) return 0; |
| 1769 | if(kill(rescan_pid, SIGTERM) < 0) |
| 1770 | fatal(errno, "error killing rescanner"); |
| 1771 | rescan_pid = -1; |
| 1772 | return 1; |
| 1773 | } |
| 1774 | |
| 1775 | /* global prefs **************************************************************/ |
| 1776 | |
| 1777 | void trackdb_set_global(const char *name, |
| 1778 | const char *value, |
| 1779 | const char *who) { |
| 1780 | DB_TXN *tid; |
| 1781 | DBT k, d; |
| 1782 | int err; |
| 1783 | int state; |
| 1784 | |
| 1785 | memset(&k, 0, sizeof k); |
| 1786 | memset(&d, 0, sizeof d); |
| 1787 | k.data = (void *)name; |
| 1788 | k.size = strlen(name); |
| 1789 | if(value) { |
| 1790 | d.data = (void *)value; |
| 1791 | d.size = strlen(value); |
| 1792 | } |
| 1793 | for(;;) { |
| 1794 | tid = trackdb_begin_transaction(); |
| 1795 | if(value) |
| 1796 | err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0); |
| 1797 | else |
| 1798 | err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0); |
| 1799 | if(!err || err == DB_NOTFOUND) break; |
| 1800 | if(err != DB_LOCK_DEADLOCK) |
| 1801 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 1802 | trackdb_abort_transaction(tid); |
| 1803 | } |
| 1804 | trackdb_commit_transaction(tid); |
| 1805 | /* log important state changes */ |
| 1806 | if(!strcmp(name, "playing")) { |
| 1807 | state = !value || !strcmp(value, "yes"); |
| 1808 | info("playing %s by %s", |
| 1809 | state ? "enabled" : "disabled", |
| 1810 | who ? who : "-"); |
| 1811 | eventlog("state", state ? "enable_play" : "disable_play", (char *)0); |
| 1812 | } |
| 1813 | if(!strcmp(name, "random-play")) { |
| 1814 | state = !value || !strcmp(value, "yes"); |
| 1815 | info("random play %s by %s", |
| 1816 | state ? "enabled" : "disabled", |
| 1817 | who ? who : "-"); |
| 1818 | eventlog("state", state ? "enable_random" : "disable_random", (char *)0); |
| 1819 | } |
| 1820 | if(!strcmp(name, "required-tags")) |
| 1821 | reqtracks = 0; |
| 1822 | } |
| 1823 | |
| 1824 | const char *trackdb_get_global(const char *name) { |
| 1825 | DB_TXN *tid; |
| 1826 | int err; |
| 1827 | const char *r; |
| 1828 | |
| 1829 | for(;;) { |
| 1830 | tid = trackdb_begin_transaction(); |
| 1831 | if(!(err = trackdb_get_global_tid(name, tid, &r))) |
| 1832 | break; |
| 1833 | trackdb_abort_transaction(tid); |
| 1834 | } |
| 1835 | trackdb_commit_transaction(tid); |
| 1836 | return r; |
| 1837 | } |
| 1838 | |
| 1839 | static int trackdb_get_global_tid(const char *name, |
| 1840 | DB_TXN *tid, |
| 1841 | const char **rp) { |
| 1842 | DBT k, d; |
| 1843 | int err; |
| 1844 | |
| 1845 | memset(&k, 0, sizeof k); |
| 1846 | k.data = (void *)name; |
| 1847 | k.size = strlen(name); |
| 1848 | switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k, |
| 1849 | prepare_data(&d), 0)) { |
| 1850 | case 0: |
| 1851 | *rp = xstrndup(d.data, d.size); |
| 1852 | return 0; |
| 1853 | case DB_NOTFOUND: |
| 1854 | *rp = 0; |
| 1855 | return 0; |
| 1856 | case DB_LOCK_DEADLOCK: |
| 1857 | return err; |
| 1858 | default: |
| 1859 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 1860 | } |
| 1861 | } |
| 1862 | |
| 1863 | /** @brief Retrieve the most recently added tracks |
| 1864 | * @param ntracksp Where to put count, or 0 |
| 1865 | * @param maxtracks Maximum number of tracks to retrieve |
| 1866 | * @return null-terminated array of track names |
| 1867 | * |
| 1868 | * The most recently added track is first in the array. |
| 1869 | */ |
| 1870 | char **trackdb_new(int *ntracksp, |
| 1871 | int maxtracks) { |
| 1872 | DB_TXN *tid; |
| 1873 | char **tracks; |
| 1874 | |
| 1875 | for(;;) { |
| 1876 | tid = trackdb_begin_transaction(); |
| 1877 | tracks = trackdb_new_tid(ntracksp, maxtracks, tid); |
| 1878 | if(tracks) |
| 1879 | break; |
| 1880 | trackdb_abort_transaction(tid); |
| 1881 | } |
| 1882 | trackdb_commit_transaction(tid); |
| 1883 | return tracks; |
| 1884 | } |
| 1885 | |
| 1886 | /** @brief Retrieve the most recently added tracks |
| 1887 | * @param ntracksp Where to put count, or 0 |
| 1888 | * @param maxtracks Maximum number of tracks to retrieve, or 0 for all |
| 1889 | * @param tid Transaction ID |
| 1890 | * @return null-terminated array of track names, or NULL on deadlock |
| 1891 | * |
| 1892 | * The most recently added track is first in the array. |
| 1893 | */ |
| 1894 | static char **trackdb_new_tid(int *ntracksp, |
| 1895 | int maxtracks, |
| 1896 | DB_TXN *tid) { |
| 1897 | DBC *c; |
| 1898 | DBT k, d; |
| 1899 | int err = 0; |
| 1900 | struct vector tracks[1]; |
| 1901 | |
| 1902 | vector_init(tracks); |
| 1903 | c = trackdb_opencursor(trackdb_noticeddb, tid); |
| 1904 | while((maxtracks <= 0 || tracks->nvec < maxtracks) |
| 1905 | && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV))) |
| 1906 | vector_append(tracks, xstrndup(d.data, d.size)); |
| 1907 | switch(err) { |
| 1908 | case 0: /* hit maxtracks */ |
| 1909 | case DB_NOTFOUND: /* ran out of tracks */ |
| 1910 | break; |
| 1911 | case DB_LOCK_DEADLOCK: |
| 1912 | trackdb_closecursor(c); |
| 1913 | return 0; |
| 1914 | default: |
| 1915 | fatal(0, "error reading noticed.db: %s", db_strerror(err)); |
| 1916 | } |
| 1917 | if((err = trackdb_closecursor(c))) |
| 1918 | return 0; /* deadlock */ |
| 1919 | vector_terminate(tracks); |
| 1920 | if(ntracksp) |
| 1921 | *ntracksp = tracks->nvec; |
| 1922 | return tracks->vec; |
| 1923 | } |
| 1924 | |
| 1925 | /** @brief Expire noticed.db |
| 1926 | * @param earliest Earliest timestamp to keep |
| 1927 | */ |
| 1928 | void trackdb_expire_noticed(time_t earliest) { |
| 1929 | DB_TXN *tid; |
| 1930 | |
| 1931 | for(;;) { |
| 1932 | tid = trackdb_begin_transaction(); |
| 1933 | if(!trackdb_expire_noticed_tid(earliest, tid)) |
| 1934 | break; |
| 1935 | trackdb_abort_transaction(tid); |
| 1936 | } |
| 1937 | trackdb_commit_transaction(tid); |
| 1938 | } |
| 1939 | |
| 1940 | /** @brief Expire noticed.db |
| 1941 | * @param earliest Earliest timestamp to keep |
| 1942 | * @param tid Transaction ID |
| 1943 | * @return 0 or DB_LOCK_DEADLOCK |
| 1944 | */ |
| 1945 | static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) { |
| 1946 | DBC *c; |
| 1947 | DBT k, d; |
| 1948 | int err = 0, ret; |
| 1949 | time_t when; |
| 1950 | uint32_t *kk; |
| 1951 | int count = 0; |
| 1952 | |
| 1953 | c = trackdb_opencursor(trackdb_noticeddb, tid); |
| 1954 | while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) { |
| 1955 | kk = k.data; |
| 1956 | when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1])); |
| 1957 | if(when >= earliest) |
| 1958 | break; |
| 1959 | if((err = c->c_del(c, 0))) { |
| 1960 | if(err != DB_LOCK_DEADLOCK) |
| 1961 | fatal(0, "error deleting expired noticed.db entry: %s", |
| 1962 | db_strerror(err)); |
| 1963 | break; |
| 1964 | } |
| 1965 | ++count; |
| 1966 | } |
| 1967 | if(err == DB_NOTFOUND) |
| 1968 | err = 0; |
| 1969 | if(err && err != DB_LOCK_DEADLOCK) |
| 1970 | fatal(0, "error expiring noticed.db: %s", db_strerror(err)); |
| 1971 | ret = err; |
| 1972 | if((err = trackdb_closecursor(c))) { |
| 1973 | if(err != DB_LOCK_DEADLOCK) |
| 1974 | fatal(0, "error closing cursor: %s", db_strerror(err)); |
| 1975 | ret = err; |
| 1976 | } |
| 1977 | if(!ret && count) |
| 1978 | info("expired %d tracks from noticed.db", count); |
| 1979 | return ret; |
| 1980 | } |
| 1981 | |
| 1982 | /* tidying up ****************************************************************/ |
| 1983 | |
| 1984 | void trackdb_gc(void) { |
| 1985 | int err; |
| 1986 | char **logfiles; |
| 1987 | |
| 1988 | if((err = trackdb_env->txn_checkpoint(trackdb_env, |
| 1989 | config->checkpoint_kbyte, |
| 1990 | config->checkpoint_min, |
| 1991 | 0))) |
| 1992 | fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err)); |
| 1993 | if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE))) |
| 1994 | fatal(0, "trackdb_env->log_archive: %s", db_strerror(err)); |
| 1995 | /* This makes catastrophic recovery impossible. However, the user can still |
| 1996 | * preserve the important data by using disorder-dump to snapshot their |
| 1997 | * prefs, and later to restore it. This is likely to have much small |
| 1998 | * long-term storage requirements than record the db logfiles. */ |
| 1999 | } |
| 2000 | |
| 2001 | /* |
| 2002 | Local Variables: |
| 2003 | c-basic-offset:2 |
| 2004 | comment-column:40 |
| 2005 | fill-column:79 |
| 2006 | indent-tabs-mode:nil |
| 2007 | End: |
| 2008 | */ |