| 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 | /** @file server/trackdb.c |
| 21 | * @brief Track database */ |
| 22 | |
| 23 | #include <config.h> |
| 24 | #include "types.h" |
| 25 | |
| 26 | #include <string.h> |
| 27 | #include <stdio.h> |
| 28 | #include <db.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <pcre.h> |
| 31 | #include <assert.h> |
| 32 | #include <unistd.h> |
| 33 | #include <errno.h> |
| 34 | #include <stddef.h> |
| 35 | #include <sys/time.h> |
| 36 | #include <sys/resource.h> |
| 37 | #include <time.h> |
| 38 | #include <arpa/inet.h> |
| 39 | #include <sys/wait.h> |
| 40 | |
| 41 | #include "event.h" |
| 42 | #include "mem.h" |
| 43 | #include "kvp.h" |
| 44 | #include "log.h" |
| 45 | #include "vector.h" |
| 46 | #include "trackdb.h" |
| 47 | #include "configuration.h" |
| 48 | #include "syscalls.h" |
| 49 | #include "wstat.h" |
| 50 | #include "printf.h" |
| 51 | #include "filepart.h" |
| 52 | #include "trackname.h" |
| 53 | #include "trackdb-int.h" |
| 54 | #include "logfd.h" |
| 55 | #include "cache.h" |
| 56 | #include "eventlog.h" |
| 57 | #include "hash.h" |
| 58 | #include "unicode.h" |
| 59 | #include "unidata.h" |
| 60 | |
| 61 | #define RESCAN "disorder-rescan" |
| 62 | #define DEADLOCK "disorder-deadlock" |
| 63 | |
| 64 | static const char *getpart(const char *track, |
| 65 | const char *context, |
| 66 | const char *part, |
| 67 | const struct kvp *p, |
| 68 | int *used_db); |
| 69 | static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp); |
| 70 | static char **trackdb_new_tid(int *ntracksp, |
| 71 | int maxtracks, |
| 72 | DB_TXN *tid); |
| 73 | static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid); |
| 74 | |
| 75 | const struct cache_type cache_files_type = { 86400 }; |
| 76 | unsigned long cache_files_hits, cache_files_misses; |
| 77 | |
| 78 | /** @brief Set by trackdb_open() */ |
| 79 | int trackdb_existing_database; |
| 80 | |
| 81 | /* setup and teardown ********************************************************/ |
| 82 | |
| 83 | static const char *home; /* home had better not change */ |
| 84 | DB_ENV *trackdb_env; /* db environment */ |
| 85 | |
| 86 | /** @brief The tracks database |
| 87 | * - Keys are UTF-8(NFC(unicode(path name))) |
| 88 | * - Values are encoded key-value pairs |
| 89 | * - Data is reconstructable data about tracks that currently exist |
| 90 | */ |
| 91 | DB *trackdb_tracksdb; |
| 92 | |
| 93 | /** @brief The preferences database |
| 94 | * |
| 95 | * - Keys are UTF-8(NFC(unicode(path name))) |
| 96 | * - Values are encoded key-value pairs |
| 97 | * - Data is user data about tracks (that might not exist any more) |
| 98 | * and cannot be reconstructed |
| 99 | */ |
| 100 | DB *trackdb_prefsdb; |
| 101 | |
| 102 | /** @brief The search database |
| 103 | * |
| 104 | * - Keys are UTF-8(NFKC(casefold(search term))) |
| 105 | * - Values are UTF-8(NFC(unicode(path name))) |
| 106 | * - There can be more than one value per key |
| 107 | * - Presence of key,value means that path matches the search terms |
| 108 | * - Only tracks fond in @ref tracks_tracksdb are represented here |
| 109 | * - This database can be reconstructed, it contains no user data |
| 110 | */ |
| 111 | DB *trackdb_searchdb; |
| 112 | |
| 113 | /** @brief The tags database |
| 114 | * |
| 115 | * - Keys are UTF-8(NFKC(casefold(tag))) |
| 116 | * - Values are UTF-8(NFC(unicode(path name))) |
| 117 | * - There can be more than one value per key |
| 118 | * - Presence of key,value means that path matches the tag |
| 119 | * - This is always in sync with the tags preference |
| 120 | * - This database can be reconstructed, it contains no user data |
| 121 | */ |
| 122 | DB *trackdb_tagsdb; /* the tags database */ |
| 123 | |
| 124 | /** @brief The global preferences database |
| 125 | * - Keys are UTF-8(NFC(preference)) |
| 126 | * - Values are global preference values |
| 127 | * - Data is user data and cannot be reconstructed |
| 128 | */ |
| 129 | DB *trackdb_globaldb; /* global preferences */ |
| 130 | |
| 131 | /** @brief The noticed database |
| 132 | * - Keys are 64-bit big-endian timestamps |
| 133 | * - Values are UTF-8(NFC(unicode(path name))) |
| 134 | * - There can be more than one value per key |
| 135 | * - Presence of key,value means that path was added at the given time |
| 136 | * - Data cannot be reconstructed (but isn't THAT important) |
| 137 | */ |
| 138 | DB *trackdb_noticeddb; /* when track noticed */ |
| 139 | static pid_t db_deadlock_pid = -1; /* deadlock manager PID */ |
| 140 | static pid_t rescan_pid = -1; /* rescanner PID */ |
| 141 | static int initialized, opened; /* state */ |
| 142 | |
| 143 | /* tracks matched by required_tags */ |
| 144 | static char **reqtracks; |
| 145 | static size_t nreqtracks; |
| 146 | |
| 147 | /* comparison function for keys */ |
| 148 | static int compare(DB attribute((unused)) *db_, |
| 149 | const DBT *a, const DBT *b) { |
| 150 | return compare_path_raw(a->data, a->size, b->data, b->size); |
| 151 | } |
| 152 | |
| 153 | /** @brief Open database environment |
| 154 | * @param flags Flags word |
| 155 | * |
| 156 | * Flags should be one of: |
| 157 | * - @ref TRACKDB_NO_RECOVER |
| 158 | * - @ref TRACKDB_NORMAL_RECOVER |
| 159 | * - @ref TRACKDB_FATAL_RECOVER |
| 160 | */ |
| 161 | void trackdb_init(int flags) { |
| 162 | int err; |
| 163 | const int recover = flags & TRACKDB_RECOVER_MASK; |
| 164 | static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL }; |
| 165 | |
| 166 | /* sanity checks */ |
| 167 | assert(initialized == 0); |
| 168 | ++initialized; |
| 169 | if(home) { |
| 170 | if(strcmp(home, config->home)) |
| 171 | fatal(0, "cannot change db home without server restart"); |
| 172 | home = config->home; |
| 173 | } |
| 174 | |
| 175 | /* create environment */ |
| 176 | if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s", |
| 177 | db_strerror(err)); |
| 178 | if((err = trackdb_env->set_alloc(trackdb_env, |
| 179 | xmalloc_noptr, xrealloc_noptr, xfree))) |
| 180 | fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err)); |
| 181 | if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000))) |
| 182 | fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err)); |
| 183 | if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000))) |
| 184 | fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err)); |
| 185 | if((err = trackdb_env->open(trackdb_env, config->home, |
| 186 | DB_INIT_LOG |
| 187 | |DB_INIT_LOCK |
| 188 | |DB_INIT_MPOOL |
| 189 | |DB_INIT_TXN |
| 190 | |DB_CREATE |
| 191 | |recover_type[recover], |
| 192 | 0666))) |
| 193 | fatal(0, "trackdb_env->open %s: %s", config->home, db_strerror(err)); |
| 194 | trackdb_env->set_errpfx(trackdb_env, "DB"); |
| 195 | trackdb_env->set_errfile(trackdb_env, stderr); |
| 196 | trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1); |
| 197 | trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1); |
| 198 | trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1); |
| 199 | D(("initialized database environment")); |
| 200 | } |
| 201 | |
| 202 | /* called when deadlock manager terminates */ |
| 203 | static int reap_db_deadlock(ev_source attribute((unused)) *ev, |
| 204 | pid_t attribute((unused)) pid, |
| 205 | int status, |
| 206 | const struct rusage attribute((unused)) *rusage, |
| 207 | void attribute((unused)) *u) { |
| 208 | db_deadlock_pid = -1; |
| 209 | if(initialized) |
| 210 | fatal(0, "deadlock manager unexpectedly terminated: %s", |
| 211 | wstat(status)); |
| 212 | else |
| 213 | D(("deadlock manager terminated: %s", wstat(status))); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static pid_t subprogram(ev_source *ev, const char *prog, |
| 218 | int outputfd) { |
| 219 | pid_t pid; |
| 220 | |
| 221 | /* If we're in the background then trap subprocess stdout/stderr */ |
| 222 | if(!(pid = xfork())) { |
| 223 | exitfn = _exit; |
| 224 | if(ev) |
| 225 | ev_signal_atfork(ev); |
| 226 | signal(SIGPIPE, SIG_DFL); |
| 227 | if(outputfd != -1) { |
| 228 | xdup2(outputfd, 1); |
| 229 | xclose(outputfd); |
| 230 | } |
| 231 | /* If we were negatively niced, undo it. We don't bother checking for |
| 232 | * error, it's not that important. */ |
| 233 | setpriority(PRIO_PROCESS, 0, 0); |
| 234 | execlp(prog, prog, "--config", configfile, |
| 235 | debugging ? "--debug" : "--no-debug", |
| 236 | log_default == &log_syslog ? "--syslog" : "--no-syslog", |
| 237 | (char *)0); |
| 238 | fatal(errno, "error invoking %s", prog); |
| 239 | } |
| 240 | return pid; |
| 241 | } |
| 242 | |
| 243 | /* start deadlock manager */ |
| 244 | void trackdb_master(ev_source *ev) { |
| 245 | assert(db_deadlock_pid == -1); |
| 246 | db_deadlock_pid = subprogram(ev, DEADLOCK, -1); |
| 247 | ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0); |
| 248 | D(("started deadlock manager")); |
| 249 | } |
| 250 | |
| 251 | /* close environment */ |
| 252 | void trackdb_deinit(void) { |
| 253 | int err; |
| 254 | |
| 255 | /* sanity checks */ |
| 256 | assert(initialized == 1); |
| 257 | --initialized; |
| 258 | |
| 259 | /* close the environment */ |
| 260 | if((err = trackdb_env->close(trackdb_env, 0))) |
| 261 | fatal(0, "trackdb_env->close: %s", db_strerror(err)); |
| 262 | |
| 263 | if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0) |
| 264 | fatal(errno, "error killing rescanner"); |
| 265 | |
| 266 | /* terminate the deadlock manager */ |
| 267 | if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0) |
| 268 | fatal(errno, "error killing deadlock manager"); |
| 269 | db_deadlock_pid = -1; |
| 270 | |
| 271 | D(("deinitialized database environment")); |
| 272 | } |
| 273 | |
| 274 | /* open a specific database */ |
| 275 | static DB *open_db(const char *path, |
| 276 | u_int32_t dbflags, |
| 277 | DBTYPE dbtype, |
| 278 | u_int32_t openflags, |
| 279 | int mode) { |
| 280 | int err; |
| 281 | DB *db; |
| 282 | |
| 283 | D(("open %s", path)); |
| 284 | path = config_get_file(path); |
| 285 | if((err = db_create(&db, trackdb_env, 0))) |
| 286 | fatal(0, "db_create %s: %s", path, db_strerror(err)); |
| 287 | if(dbflags) |
| 288 | if((err = db->set_flags(db, dbflags))) |
| 289 | fatal(0, "db->set_flags %s: %s", path, db_strerror(err)); |
| 290 | if(dbtype == DB_BTREE) |
| 291 | if((err = db->set_bt_compare(db, compare))) |
| 292 | fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err)); |
| 293 | if((err = db->open(db, 0, path, 0, dbtype, |
| 294 | openflags | DB_AUTO_COMMIT, mode))) { |
| 295 | if((openflags & DB_CREATE) || errno != ENOENT) |
| 296 | fatal(0, "db->open %s: %s", path, db_strerror(err)); |
| 297 | db->close(db, 0); |
| 298 | db = 0; |
| 299 | } |
| 300 | return db; |
| 301 | } |
| 302 | |
| 303 | /** @brief Open track databases |
| 304 | * @param Flags flags word |
| 305 | * |
| 306 | * @p flags should be one of: |
| 307 | * - @p TRACKDB_NO_UPGRADE, if no upgrade should be attempted |
| 308 | * - @p TRACKDB_CAN_UPGRADE, if an upgrade may be attempted |
| 309 | * - @p TRACKDB_OPEN_FOR_UPGRADE, if this is disorder-dbupgrade |
| 310 | */ |
| 311 | void trackdb_open(int flags) { |
| 312 | int err; |
| 313 | pid_t pid; |
| 314 | |
| 315 | /* sanity checks */ |
| 316 | assert(opened == 0); |
| 317 | ++opened; |
| 318 | /* check the database version first */ |
| 319 | trackdb_globaldb = open_db("global.db", 0, DB_HASH, 0, 0666); |
| 320 | if(trackdb_globaldb) { |
| 321 | /* This is an existing database */ |
| 322 | const char *s; |
| 323 | long oldversion; |
| 324 | |
| 325 | s = trackdb_get_global("_dbversion"); |
| 326 | /* Close the database again, we'll open it property below */ |
| 327 | if((err = trackdb_globaldb->close(trackdb_globaldb, 0))) |
| 328 | fatal(0, "error closing global.db: %s", db_strerror(err)); |
| 329 | trackdb_globaldb = 0; |
| 330 | /* Convert version string to an integer */ |
| 331 | oldversion = s ? atol(s) : 1; |
| 332 | if(oldversion > config->dbversion) { |
| 333 | /* Database is from the future; we never allow this. */ |
| 334 | fatal(0, "this version of DisOrder is too old for database version %ld", |
| 335 | oldversion); |
| 336 | } |
| 337 | if(oldversion < config->dbversion) { |
| 338 | /* Database version is out of date */ |
| 339 | switch(flags & TRACKDB_UPGRADE_MASK) { |
| 340 | case TRACKDB_NO_UPGRADE: |
| 341 | /* This database needs upgrading but this is not permitted */ |
| 342 | fatal(0, "database needs upgrading from %ld to %ld", |
| 343 | oldversion, config->dbversion); |
| 344 | case TRACKDB_CAN_UPGRADE: |
| 345 | /* This database needs upgrading */ |
| 346 | info("invoking disorder-dbupgrade to upgrade from %ld to %ld", |
| 347 | oldversion, config->dbversion); |
| 348 | pid = subprogram(0, "disorder-dbupgrade", -1); |
| 349 | while(waitpid(pid, &err, 0) == -1 && errno == EINTR) |
| 350 | ; |
| 351 | if(err) |
| 352 | fatal(0, "disorder-dbupgrade %s", wstat(err)); |
| 353 | info("disorder-dbupgrade succeeded"); |
| 354 | break; |
| 355 | case TRACKDB_OPEN_FOR_UPGRADE: |
| 356 | break; |
| 357 | default: |
| 358 | abort(); |
| 359 | } |
| 360 | } |
| 361 | if(oldversion == config->dbversion && (flags & TRACKDB_OPEN_FOR_UPGRADE)) { |
| 362 | /* This doesn't make any sense */ |
| 363 | fatal(0, "database is already at current version"); |
| 364 | } |
| 365 | trackdb_existing_database = 1; |
| 366 | } else { |
| 367 | if(flags & TRACKDB_OPEN_FOR_UPGRADE) { |
| 368 | /* Cannot upgrade a new database */ |
| 369 | fatal(0, "cannot upgrade a database that does not exist"); |
| 370 | } |
| 371 | /* This is a brand new database */ |
| 372 | trackdb_existing_database = 0; |
| 373 | } |
| 374 | /* open the databases */ |
| 375 | trackdb_tracksdb = open_db("tracks.db", |
| 376 | DB_RECNUM, DB_BTREE, DB_CREATE, 0666); |
| 377 | trackdb_searchdb = open_db("search.db", |
| 378 | DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666); |
| 379 | trackdb_tagsdb = open_db("tags.db", |
| 380 | DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666); |
| 381 | trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666); |
| 382 | trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666); |
| 383 | trackdb_noticeddb = open_db("noticed.db", |
| 384 | DB_DUPSORT, DB_BTREE, DB_CREATE, 0666); |
| 385 | if(!trackdb_existing_database) { |
| 386 | /* Stash the database version */ |
| 387 | char buf[32]; |
| 388 | |
| 389 | assert(!(flags & TRACKDB_OPEN_FOR_UPGRADE)); |
| 390 | snprintf(buf, sizeof buf, "%ld", config->dbversion); |
| 391 | trackdb_set_global("_dbversion", buf, 0); |
| 392 | } |
| 393 | D(("opened databases")); |
| 394 | } |
| 395 | |
| 396 | /* close track databases */ |
| 397 | void trackdb_close(void) { |
| 398 | int err; |
| 399 | |
| 400 | /* sanity checks */ |
| 401 | assert(opened == 1); |
| 402 | --opened; |
| 403 | if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0))) |
| 404 | fatal(0, "error closing tracks.db: %s", db_strerror(err)); |
| 405 | if((err = trackdb_searchdb->close(trackdb_searchdb, 0))) |
| 406 | fatal(0, "error closing search.db: %s", db_strerror(err)); |
| 407 | if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0))) |
| 408 | fatal(0, "error closing tags.db: %s", db_strerror(err)); |
| 409 | if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0))) |
| 410 | fatal(0, "error closing prefs.db: %s", db_strerror(err)); |
| 411 | if((err = trackdb_globaldb->close(trackdb_globaldb, 0))) |
| 412 | fatal(0, "error closing global.db: %s", db_strerror(err)); |
| 413 | if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0))) |
| 414 | fatal(0, "error closing noticed.db: %s", db_strerror(err)); |
| 415 | trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0; |
| 416 | trackdb_tagsdb = trackdb_globaldb = 0; |
| 417 | D(("closed databases")); |
| 418 | } |
| 419 | |
| 420 | /* generic db routines *******************************************************/ |
| 421 | |
| 422 | /* fetch and decode a database entry. Returns 0, DB_NOTFOUND or |
| 423 | * DB_LOCK_DEADLOCK. */ |
| 424 | int trackdb_getdata(DB *db, |
| 425 | const char *track, |
| 426 | struct kvp **kp, |
| 427 | DB_TXN *tid) { |
| 428 | int err; |
| 429 | DBT key, data; |
| 430 | |
| 431 | switch(err = db->get(db, tid, make_key(&key, track), |
| 432 | prepare_data(&data), 0)) { |
| 433 | case 0: |
| 434 | *kp = kvp_urldecode(data.data, data.size); |
| 435 | return 0; |
| 436 | case DB_NOTFOUND: |
| 437 | *kp = 0; |
| 438 | return err; |
| 439 | case DB_LOCK_DEADLOCK: |
| 440 | error(0, "error querying database: %s", db_strerror(err)); |
| 441 | return err; |
| 442 | default: |
| 443 | fatal(0, "error querying database: %s", db_strerror(err)); |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | /* encode and store a database entry. Returns 0, DB_KEYEXIST or |
| 448 | * DB_LOCK_DEADLOCK. */ |
| 449 | int trackdb_putdata(DB *db, |
| 450 | const char *track, |
| 451 | const struct kvp *k, |
| 452 | DB_TXN *tid, |
| 453 | u_int32_t flags) { |
| 454 | int err; |
| 455 | DBT key, data; |
| 456 | |
| 457 | switch(err = db->put(db, tid, make_key(&key, track), |
| 458 | encode_data(&data, k), flags)) { |
| 459 | case 0: |
| 460 | case DB_KEYEXIST: |
| 461 | return err; |
| 462 | case DB_LOCK_DEADLOCK: |
| 463 | error(0, "error updating database: %s", db_strerror(err)); |
| 464 | return err; |
| 465 | default: |
| 466 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | /* delete a database entry */ |
| 471 | int trackdb_delkey(DB *db, |
| 472 | const char *track, |
| 473 | DB_TXN *tid) { |
| 474 | int err; |
| 475 | |
| 476 | DBT key; |
| 477 | switch(err = db->del(db, tid, make_key(&key, track), 0)) { |
| 478 | case 0: |
| 479 | case DB_NOTFOUND: |
| 480 | return 0; |
| 481 | case DB_LOCK_DEADLOCK: |
| 482 | error(0, "error updating database: %s", db_strerror(err)); |
| 483 | return err; |
| 484 | default: |
| 485 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 486 | } |
| 487 | } |
| 488 | |
| 489 | /* open a database cursor */ |
| 490 | DBC *trackdb_opencursor(DB *db, DB_TXN *tid) { |
| 491 | int err; |
| 492 | DBC *c; |
| 493 | |
| 494 | switch(err = db->cursor(db, tid, &c, 0)) { |
| 495 | case 0: break; |
| 496 | default: fatal(0, "error creating cursor: %s", db_strerror(err)); |
| 497 | } |
| 498 | return c; |
| 499 | } |
| 500 | |
| 501 | /* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */ |
| 502 | int trackdb_closecursor(DBC *c) { |
| 503 | int err; |
| 504 | |
| 505 | if(!c) return 0; |
| 506 | switch(err = c->c_close(c)) { |
| 507 | case 0: |
| 508 | return err; |
| 509 | case DB_LOCK_DEADLOCK: |
| 510 | error(0, "error closing cursor: %s", db_strerror(err)); |
| 511 | return err; |
| 512 | default: |
| 513 | fatal(0, "error closing cursor: %s", db_strerror(err)); |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | /* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */ |
| 518 | int trackdb_delkeydata(DB *db, |
| 519 | const char *word, |
| 520 | const char *track, |
| 521 | DB_TXN *tid) { |
| 522 | int err; |
| 523 | DBC *c; |
| 524 | DBT key, data; |
| 525 | |
| 526 | c = trackdb_opencursor(db, tid); |
| 527 | switch(err = c->c_get(c, make_key(&key, word), |
| 528 | make_key(&data, track), DB_GET_BOTH)) { |
| 529 | case 0: |
| 530 | switch(err = c->c_del(c, 0)) { |
| 531 | case 0: |
| 532 | break; |
| 533 | case DB_KEYEMPTY: |
| 534 | err = 0; |
| 535 | break; |
| 536 | case DB_LOCK_DEADLOCK: |
| 537 | error(0, "error updating database: %s", db_strerror(err)); |
| 538 | break; |
| 539 | default: |
| 540 | fatal(0, "c->c_del: %s", db_strerror(err)); |
| 541 | } |
| 542 | break; |
| 543 | case DB_NOTFOUND: |
| 544 | break; |
| 545 | case DB_LOCK_DEADLOCK: |
| 546 | error(0, "error updating database: %s", db_strerror(err)); |
| 547 | break; |
| 548 | default: |
| 549 | fatal(0, "c->c_get: %s", db_strerror(err)); |
| 550 | } |
| 551 | if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK; |
| 552 | return err; |
| 553 | } |
| 554 | |
| 555 | /* start a transaction */ |
| 556 | DB_TXN *trackdb_begin_transaction(void) { |
| 557 | DB_TXN *tid; |
| 558 | int err; |
| 559 | |
| 560 | if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0))) |
| 561 | fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err)); |
| 562 | return tid; |
| 563 | } |
| 564 | |
| 565 | /* abort transaction */ |
| 566 | void trackdb_abort_transaction(DB_TXN *tid) { |
| 567 | int err; |
| 568 | |
| 569 | if(tid) |
| 570 | if((err = tid->abort(tid))) |
| 571 | fatal(0, "tid->abort: %s", db_strerror(err)); |
| 572 | } |
| 573 | |
| 574 | /* commit transaction */ |
| 575 | void trackdb_commit_transaction(DB_TXN *tid) { |
| 576 | int err; |
| 577 | |
| 578 | if((err = tid->commit(tid, 0))) |
| 579 | fatal(0, "tid->commit: %s", db_strerror(err)); |
| 580 | } |
| 581 | |
| 582 | /* search/tags shared code ***************************************************/ |
| 583 | |
| 584 | /* comparison function used by dedupe() */ |
| 585 | static int wordcmp(const void *a, const void *b) { |
| 586 | return strcmp(*(const char **)a, *(const char **)b); |
| 587 | } |
| 588 | |
| 589 | /* sort and de-dupe VEC */ |
| 590 | static char **dedupe(char **vec, int nvec) { |
| 591 | int m, n; |
| 592 | |
| 593 | qsort(vec, nvec, sizeof (char *), wordcmp); |
| 594 | m = n = 0; |
| 595 | if(nvec) { |
| 596 | vec[m++] = vec[0]; |
| 597 | for(n = 1; n < nvec; ++n) |
| 598 | if(strcmp(vec[n], vec[m - 1])) |
| 599 | vec[m++] = vec[n]; |
| 600 | } |
| 601 | vec[m] = 0; |
| 602 | return vec; |
| 603 | } |
| 604 | |
| 605 | /* update a key/track database. Returns 0 or DB_DEADLOCK. */ |
| 606 | static int register_word(DB *db, const char *what, |
| 607 | const char *track, const char *word, |
| 608 | DB_TXN *tid) { |
| 609 | int err; |
| 610 | DBT key, data; |
| 611 | |
| 612 | switch(err = db->put(db, tid, make_key(&key, word), |
| 613 | make_key(&data, track), DB_NODUPDATA)) { |
| 614 | case 0: |
| 615 | case DB_KEYEXIST: |
| 616 | return 0; |
| 617 | case DB_LOCK_DEADLOCK: |
| 618 | error(0, "error updating %s.db: %s", what, db_strerror(err)); |
| 619 | return err; |
| 620 | default: |
| 621 | fatal(0, "error updating %s.db: %s", what, db_strerror(err)); |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | /* search primitives *********************************************************/ |
| 626 | |
| 627 | /* return true iff NAME is a trackname_display_ pref */ |
| 628 | static int is_display_pref(const char *name) { |
| 629 | static const char prefix[] = "trackname_display_"; |
| 630 | return !strncmp(name, prefix, (sizeof prefix) - 1); |
| 631 | } |
| 632 | |
| 633 | /** @brief Word_Break property tailor that treats underscores as spaces */ |
| 634 | static int tailor_underscore_Word_Break_Other(uint32_t c) { |
| 635 | switch(c) { |
| 636 | default: |
| 637 | return -1; |
| 638 | case 0x005F: /* LOW LINE (SPACING UNDERSCORE) */ |
| 639 | return unicode_Word_Break_Other; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | /** @brief Remove all combining characters in-place |
| 644 | * @param s Pointer to start of string |
| 645 | * @param ns Length of string |
| 646 | * @return New, possiblby reduced, length |
| 647 | */ |
| 648 | static size_t remove_combining_chars(uint32_t *s, size_t ns) { |
| 649 | uint32_t *start = s, *t = s, *end = s + ns; |
| 650 | |
| 651 | while(s < end) { |
| 652 | const uint32_t c = *s++; |
| 653 | if(!utf32_combining_class(c)) |
| 654 | *t++ = c; |
| 655 | } |
| 656 | return t - start; |
| 657 | } |
| 658 | |
| 659 | /** @brief Normalize and split a string using a given tailoring */ |
| 660 | static void word_split(struct vector *v, |
| 661 | const char *s, |
| 662 | unicode_property_tailor *pt) { |
| 663 | size_t nw, nt32, i; |
| 664 | uint32_t *t32, **w32; |
| 665 | |
| 666 | /* Convert to UTF-32 */ |
| 667 | if(!(t32 = utf8_to_utf32(s, strlen(s), &nt32))) |
| 668 | return; |
| 669 | /* Erase case distinctions */ |
| 670 | if(!(t32 = utf32_casefold_compat(t32, nt32, &nt32))) |
| 671 | return; |
| 672 | /* Drop combining characters */ |
| 673 | nt32 = remove_combining_chars(t32, nt32); |
| 674 | /* Split into words, treating _ as a space */ |
| 675 | w32 = utf32_word_split(t32, nt32, &nw, pt); |
| 676 | /* Convert words back to UTF-8 and append to result */ |
| 677 | for(i = 0; i < nw; ++i) |
| 678 | vector_append(v, utf32_to_utf8(w32[i], utf32_len(w32[i]), 0)); |
| 679 | } |
| 680 | |
| 681 | /* compute the words of a track name */ |
| 682 | static char **track_to_words(const char *track, |
| 683 | const struct kvp *p) { |
| 684 | struct vector v; |
| 685 | const char *rootless = track_rootless(track); |
| 686 | |
| 687 | if(!rootless) |
| 688 | rootless = track; /* bodge */ |
| 689 | vector_init(&v); |
| 690 | rootless = strip_extension(rootless); |
| 691 | word_split(&v, strip_extension(rootless), tailor_underscore_Word_Break_Other); |
| 692 | for(; p; p = p->next) |
| 693 | if(is_display_pref(p->name)) |
| 694 | word_split(&v, p->value, 0); |
| 695 | vector_terminate(&v); |
| 696 | return dedupe(v.vec, v.nvec); |
| 697 | } |
| 698 | |
| 699 | /* return nonzero iff WORD is a stopword */ |
| 700 | static int stopword(const char *word) { |
| 701 | int n; |
| 702 | |
| 703 | for(n = 0; n < config->stopword.n |
| 704 | && strcmp(word, config->stopword.s[n]); ++n) |
| 705 | ; |
| 706 | return n < config->stopword.n; |
| 707 | } |
| 708 | |
| 709 | /* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */ |
| 710 | static int register_search_word(const char *track, const char *word, |
| 711 | DB_TXN *tid) { |
| 712 | if(stopword(word)) return 0; |
| 713 | return register_word(trackdb_searchdb, "search", track, word, tid); |
| 714 | } |
| 715 | |
| 716 | /* Tags **********************************************************************/ |
| 717 | |
| 718 | /* Return nonzero if C is a valid tag character */ |
| 719 | static int tagchar(int c) { |
| 720 | switch(c) { |
| 721 | case ',': |
| 722 | return 0; |
| 723 | default: |
| 724 | return c >= ' '; |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | /* Parse and de-dupe a tag list. If S=0 then assumes "". */ |
| 729 | static char **parsetags(const char *s) { |
| 730 | const char *t; |
| 731 | struct vector v; |
| 732 | |
| 733 | vector_init(&v); |
| 734 | if(s) { |
| 735 | /* skip initial separators */ |
| 736 | while(*s && (!tagchar(*s) || *s == ' ')) |
| 737 | ++s; |
| 738 | while(*s) { |
| 739 | /* find the extent of the tag */ |
| 740 | t = s; |
| 741 | while(*s && tagchar(*s)) |
| 742 | ++s; |
| 743 | /* strip trailing spaces */ |
| 744 | while(s > t && s[-1] == ' ') |
| 745 | --s; |
| 746 | vector_append(&v, xstrndup(t, s - t)); |
| 747 | /* skip intermediate and trailing separators */ |
| 748 | while(*s && (!tagchar(*s) || *s == ' ')) |
| 749 | ++s; |
| 750 | } |
| 751 | } |
| 752 | vector_terminate(&v); |
| 753 | return dedupe(v.vec, v.nvec); |
| 754 | } |
| 755 | |
| 756 | /* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */ |
| 757 | static int register_tag(const char *track, const char *tag, DB_TXN *tid) { |
| 758 | return register_word(trackdb_tagsdb, "tags", track, tag, tid); |
| 759 | } |
| 760 | |
| 761 | /* aliases *******************************************************************/ |
| 762 | |
| 763 | /* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If |
| 764 | * there is no alias sets *aliasp to 0. */ |
| 765 | static int compute_alias(char **aliasp, |
| 766 | const char *track, |
| 767 | const struct kvp *p, |
| 768 | DB_TXN *tid) { |
| 769 | struct dynstr d; |
| 770 | const char *s = config->alias, *t, *expansion, *part; |
| 771 | int c, used_db = 0, slash_prefix, err; |
| 772 | struct kvp *at; |
| 773 | const char *const root = find_track_root(track); |
| 774 | |
| 775 | if(!root) { |
| 776 | /* Bodge for tracks with no root */ |
| 777 | *aliasp = 0; |
| 778 | return 0; |
| 779 | } |
| 780 | dynstr_init(&d); |
| 781 | dynstr_append_string(&d, root); |
| 782 | while((c = (unsigned char)*s++)) { |
| 783 | if(c != '{') { |
| 784 | dynstr_append(&d, c); |
| 785 | continue; |
| 786 | } |
| 787 | if((slash_prefix = (*s == '/'))) |
| 788 | s++; |
| 789 | t = strchr(s, '}'); |
| 790 | assert(t != 0); /* validated at startup */ |
| 791 | part = xstrndup(s, t - s); |
| 792 | expansion = getpart(track, "display", part, p, &used_db); |
| 793 | if(*expansion) { |
| 794 | if(slash_prefix) dynstr_append(&d, '/'); |
| 795 | dynstr_append_string(&d, expansion); |
| 796 | } |
| 797 | s = t + 1; /* skip {part} */ |
| 798 | } |
| 799 | /* only admit to the alias if we used the db... */ |
| 800 | if(!used_db) { |
| 801 | *aliasp = 0; |
| 802 | return 0; |
| 803 | } |
| 804 | dynstr_terminate(&d); |
| 805 | /* ...and the answer differs from the original... */ |
| 806 | if(!strcmp(track, d.vec)) { |
| 807 | *aliasp = 0; |
| 808 | return 0; |
| 809 | } |
| 810 | /* ...and there isn't already a different track with that name (including as |
| 811 | * an alias) */ |
| 812 | switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) { |
| 813 | case 0: |
| 814 | if((s = kvp_get(at, "_alias_for")) |
| 815 | && !strcmp(s, track)) { |
| 816 | case DB_NOTFOUND: |
| 817 | *aliasp = d.vec; |
| 818 | } else { |
| 819 | *aliasp = 0; |
| 820 | } |
| 821 | return 0; |
| 822 | default: |
| 823 | return err; |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | /* get track and prefs data (if tp/pp not null pointers). Returns 0 on |
| 828 | * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK. |
| 829 | * Always sets the return values, even if only to null pointers. */ |
| 830 | static int gettrackdata(const char *track, |
| 831 | struct kvp **tp, |
| 832 | struct kvp **pp, |
| 833 | const char **actualp, |
| 834 | unsigned flags, |
| 835 | #define GTD_NOALIAS 0x0001 |
| 836 | DB_TXN *tid) { |
| 837 | int err; |
| 838 | const char *actual = track; |
| 839 | struct kvp *t = 0, *p = 0; |
| 840 | |
| 841 | if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done; |
| 842 | if((actual = kvp_get(t, "_alias_for"))) { |
| 843 | if(flags & GTD_NOALIAS) { |
| 844 | error(0, "alias passed to gettrackdata where real path required"); |
| 845 | abort(); |
| 846 | } |
| 847 | if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done; |
| 848 | } else |
| 849 | actual = track; |
| 850 | assert(actual != 0); |
| 851 | if(pp) { |
| 852 | if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK) |
| 853 | goto done; |
| 854 | } |
| 855 | err = 0; |
| 856 | done: |
| 857 | if(actualp) *actualp = actual; |
| 858 | if(tp) *tp = t; |
| 859 | if(pp) *pp = p; |
| 860 | return err; |
| 861 | } |
| 862 | |
| 863 | /* trackdb_notice() **********************************************************/ |
| 864 | |
| 865 | /** @brief notice a possibly new track |
| 866 | * @return @c DB_NOTFOUND if new, 0 if already known |
| 867 | */ |
| 868 | int trackdb_notice(const char *track, |
| 869 | const char *path) { |
| 870 | int err; |
| 871 | DB_TXN *tid; |
| 872 | |
| 873 | for(;;) { |
| 874 | tid = trackdb_begin_transaction(); |
| 875 | err = trackdb_notice_tid(track, path, tid); |
| 876 | if((err == DB_LOCK_DEADLOCK)) goto fail; |
| 877 | break; |
| 878 | fail: |
| 879 | trackdb_abort_transaction(tid); |
| 880 | } |
| 881 | trackdb_commit_transaction(tid); |
| 882 | return err; |
| 883 | } |
| 884 | |
| 885 | /** @brief notice a possibly new track |
| 886 | * @param track NFC UTF-8 track name |
| 887 | * @param path Raw path name |
| 888 | * @param tid Transaction ID |
| 889 | * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also |
| 890 | */ |
| 891 | int trackdb_notice_tid(const char *track, |
| 892 | const char *path, |
| 893 | DB_TXN *tid) { |
| 894 | int err, n; |
| 895 | struct kvp *t, *a, *p; |
| 896 | int t_changed, ret; |
| 897 | char *alias, **w; |
| 898 | |
| 899 | /* notice whether the tracks.db entry changes */ |
| 900 | t_changed = 0; |
| 901 | /* get any existing tracks entry */ |
| 902 | if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK) |
| 903 | return err; |
| 904 | ret = err; /* 0 or DB_NOTFOUND */ |
| 905 | /* this is a real track */ |
| 906 | t_changed += kvp_set(&t, "_alias_for", 0); |
| 907 | t_changed += kvp_set(&t, "_path", path); |
| 908 | /* if we have an alias record it in the database */ |
| 909 | if((err = compute_alias(&alias, track, p, tid))) return err; |
| 910 | if(alias) { |
| 911 | /* won't overwrite someone else's alias as compute_alias() checks */ |
| 912 | D(("%s: alias %s", track, alias)); |
| 913 | a = 0; |
| 914 | kvp_set(&a, "_alias_for", track); |
| 915 | if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err; |
| 916 | } |
| 917 | /* update search.db */ |
| 918 | w = track_to_words(track, p); |
| 919 | for(n = 0; w[n]; ++n) |
| 920 | if((err = register_search_word(track, w[n], tid))) |
| 921 | return err; |
| 922 | /* update tags.db */ |
| 923 | w = parsetags(kvp_get(p, "tags")); |
| 924 | for(n = 0; w[n]; ++n) |
| 925 | if((err = register_tag(track, w[n], tid))) |
| 926 | return err; |
| 927 | reqtracks = 0; |
| 928 | /* only store the tracks.db entry if it has changed */ |
| 929 | if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))) |
| 930 | return err; |
| 931 | if(ret == DB_NOTFOUND) { |
| 932 | uint32_t timestamp[2]; |
| 933 | time_t now; |
| 934 | DBT key, data; |
| 935 | |
| 936 | time(&now); |
| 937 | timestamp[0] = htonl((uint64_t)now >> 32); |
| 938 | timestamp[1] = htonl((uint32_t)now); |
| 939 | memset(&key, 0, sizeof key); |
| 940 | key.data = timestamp; |
| 941 | key.size = sizeof timestamp; |
| 942 | switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key, |
| 943 | make_key(&data, track), 0)) { |
| 944 | case 0: break; |
| 945 | case DB_LOCK_DEADLOCK: return err; |
| 946 | default: fatal(0, "error updating noticed.db: %s", db_strerror(err)); |
| 947 | } |
| 948 | } |
| 949 | return ret; |
| 950 | } |
| 951 | |
| 952 | /* trackdb_obsolete() ********************************************************/ |
| 953 | |
| 954 | /* obsolete a track */ |
| 955 | int trackdb_obsolete(const char *track, DB_TXN *tid) { |
| 956 | int err, n; |
| 957 | struct kvp *p; |
| 958 | char *alias, **w; |
| 959 | |
| 960 | if((err = gettrackdata(track, 0, &p, 0, |
| 961 | GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK) |
| 962 | return err; |
| 963 | else if(err == DB_NOTFOUND) return 0; |
| 964 | /* compute the alias, if any, and delete it */ |
| 965 | if(compute_alias(&alias, track, p, tid)) return err; |
| 966 | if(alias) { |
| 967 | /* if the alias points to some other track then compute_alias won't |
| 968 | * return it */ |
| 969 | if(trackdb_delkey(trackdb_tracksdb, alias, tid)) |
| 970 | return err; |
| 971 | } |
| 972 | /* update search.db */ |
| 973 | w = track_to_words(track, p); |
| 974 | for(n = 0; w[n]; ++n) |
| 975 | if(trackdb_delkeydata(trackdb_searchdb, |
| 976 | w[n], track, tid) == DB_LOCK_DEADLOCK) |
| 977 | return err; |
| 978 | /* update tags.db */ |
| 979 | w = parsetags(kvp_get(p, "tags")); |
| 980 | for(n = 0; w[n]; ++n) |
| 981 | if(trackdb_delkeydata(trackdb_tagsdb, |
| 982 | w[n], track, tid) == DB_LOCK_DEADLOCK) |
| 983 | return err; |
| 984 | reqtracks = 0; |
| 985 | /* update tracks.db */ |
| 986 | if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK) |
| 987 | return err; |
| 988 | /* We don't delete the prefs, so they survive temporary outages of the |
| 989 | * (possibly virtual) track filesystem */ |
| 990 | return 0; |
| 991 | } |
| 992 | |
| 993 | /* trackdb_stats() ***********************************************************/ |
| 994 | |
| 995 | #define H(name) { #name, offsetof(DB_HASH_STAT, name) } |
| 996 | #define B(name) { #name, offsetof(DB_BTREE_STAT, name) } |
| 997 | |
| 998 | static const struct statinfo { |
| 999 | const char *name; |
| 1000 | size_t offset; |
| 1001 | } statinfo_hash[] = { |
| 1002 | H(hash_magic), |
| 1003 | H(hash_version), |
| 1004 | H(hash_nkeys), |
| 1005 | H(hash_ndata), |
| 1006 | H(hash_pagesize), |
| 1007 | H(hash_ffactor), |
| 1008 | H(hash_buckets), |
| 1009 | H(hash_free), |
| 1010 | H(hash_bfree), |
| 1011 | H(hash_bigpages), |
| 1012 | H(hash_big_bfree), |
| 1013 | H(hash_overflows), |
| 1014 | H(hash_ovfl_free), |
| 1015 | H(hash_dup), |
| 1016 | H(hash_dup_free), |
| 1017 | }, statinfo_btree[] = { |
| 1018 | B(bt_magic), |
| 1019 | B(bt_version), |
| 1020 | B(bt_nkeys), |
| 1021 | B(bt_ndata), |
| 1022 | B(bt_pagesize), |
| 1023 | B(bt_minkey), |
| 1024 | B(bt_re_len), |
| 1025 | B(bt_re_pad), |
| 1026 | B(bt_levels), |
| 1027 | B(bt_int_pg), |
| 1028 | B(bt_leaf_pg), |
| 1029 | B(bt_dup_pg), |
| 1030 | B(bt_over_pg), |
| 1031 | B(bt_free), |
| 1032 | B(bt_int_pgfree), |
| 1033 | B(bt_leaf_pgfree), |
| 1034 | B(bt_dup_pgfree), |
| 1035 | B(bt_over_pgfree), |
| 1036 | }; |
| 1037 | |
| 1038 | /* look up stats for DB */ |
| 1039 | static int get_stats(struct vector *v, |
| 1040 | DB *database, |
| 1041 | const struct statinfo *si, |
| 1042 | size_t nsi, |
| 1043 | DB_TXN *tid) { |
| 1044 | void *sp; |
| 1045 | size_t n; |
| 1046 | char *str; |
| 1047 | int err; |
| 1048 | |
| 1049 | if(database) { |
| 1050 | switch(err = database->stat(database, tid, &sp, 0)) { |
| 1051 | case 0: |
| 1052 | break; |
| 1053 | case DB_LOCK_DEADLOCK: |
| 1054 | error(0, "error querying database: %s", db_strerror(err)); |
| 1055 | return err; |
| 1056 | default: |
| 1057 | fatal(0, "error querying database: %s", db_strerror(err)); |
| 1058 | } |
| 1059 | for(n = 0; n < nsi; ++n) { |
| 1060 | byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name, |
| 1061 | (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset)); |
| 1062 | vector_append(v, str); |
| 1063 | } |
| 1064 | } |
| 1065 | return 0; |
| 1066 | } |
| 1067 | |
| 1068 | struct search_entry { |
| 1069 | char *word; |
| 1070 | int n; |
| 1071 | }; |
| 1072 | |
| 1073 | /* find the top COUNT words in the search database */ |
| 1074 | static int search_league(struct vector *v, int count, DB_TXN *tid) { |
| 1075 | struct search_entry *se; |
| 1076 | DBT k, d; |
| 1077 | DBC *cursor; |
| 1078 | int err, n = 0, nse = 0, i; |
| 1079 | char *word = 0; |
| 1080 | size_t wl = 0; |
| 1081 | char *str; |
| 1082 | |
| 1083 | cursor = trackdb_opencursor(trackdb_searchdb, tid); |
| 1084 | se = xmalloc(count * sizeof *se); |
| 1085 | while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d), |
| 1086 | DB_NEXT))) { |
| 1087 | if(word && wl == k.size && !strncmp(word, k.data, wl)) |
| 1088 | ++n; |
| 1089 | else { |
| 1090 | #define FINALIZE() do { \ |
| 1091 | if(word && (nse < count || n > se[nse - 1].n)) { \ |
| 1092 | if(nse == count) \ |
| 1093 | i = nse - 1; \ |
| 1094 | else \ |
| 1095 | i = nse++; \ |
| 1096 | while(i > 0 && n > se[i - 1].n) \ |
| 1097 | --i; \ |
| 1098 | memmove(&se[i + 1], &se[i], (nse - i) * sizeof *se); \ |
| 1099 | se[i].word = word; \ |
| 1100 | se[i].n = n; \ |
| 1101 | } \ |
| 1102 | } while(0) |
| 1103 | FINALIZE(); |
| 1104 | word = xstrndup(k.data, wl = k.size); |
| 1105 | n = 1; |
| 1106 | } |
| 1107 | } |
| 1108 | switch(err) { |
| 1109 | case DB_NOTFOUND: |
| 1110 | err = 0; |
| 1111 | break; |
| 1112 | case DB_LOCK_DEADLOCK: |
| 1113 | error(0, "error querying search database: %s", db_strerror(err)); |
| 1114 | break; |
| 1115 | default: |
| 1116 | fatal(0, "error querying search database: %s", db_strerror(err)); |
| 1117 | } |
| 1118 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; |
| 1119 | if(err) return err; |
| 1120 | FINALIZE(); |
| 1121 | byte_xasprintf(&str, "Top %d search words:", nse); |
| 1122 | vector_append(v, str); |
| 1123 | for(i = 0; i < nse; ++i) { |
| 1124 | byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word); |
| 1125 | vector_append(v, str); |
| 1126 | } |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | #define SI(what) statinfo_##what, \ |
| 1131 | sizeof statinfo_##what / sizeof (struct statinfo) |
| 1132 | |
| 1133 | /* return a list of database stats */ |
| 1134 | char **trackdb_stats(int *nstatsp) { |
| 1135 | DB_TXN *tid; |
| 1136 | struct vector v; |
| 1137 | |
| 1138 | vector_init(&v); |
| 1139 | for(;;) { |
| 1140 | tid = trackdb_begin_transaction(); |
| 1141 | v.nvec = 0; |
| 1142 | vector_append(&v, (char *)"Tracks database stats:"); |
| 1143 | if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail; |
| 1144 | vector_append(&v, (char *)""); |
| 1145 | vector_append(&v, (char *)"Search database stats:"); |
| 1146 | if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail; |
| 1147 | vector_append(&v, (char *)""); |
| 1148 | vector_append(&v, (char *)"Prefs database stats:"); |
| 1149 | if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail; |
| 1150 | vector_append(&v, (char *)""); |
| 1151 | if(search_league(&v, 10, tid)) goto fail; |
| 1152 | vector_terminate(&v); |
| 1153 | break; |
| 1154 | fail: |
| 1155 | trackdb_abort_transaction(tid); |
| 1156 | } |
| 1157 | trackdb_commit_transaction(tid); |
| 1158 | if(nstatsp) *nstatsp = v.nvec; |
| 1159 | return v.vec; |
| 1160 | } |
| 1161 | |
| 1162 | struct stats_details { |
| 1163 | void (*done)(char *data, void *u); |
| 1164 | void *u; |
| 1165 | int exited; /* subprocess exited */ |
| 1166 | int closed; /* pipe close */ |
| 1167 | int wstat; /* wait status from subprocess */ |
| 1168 | struct dynstr data[1]; /* data read from pipe */ |
| 1169 | }; |
| 1170 | |
| 1171 | static void stats_complete(struct stats_details *d) { |
| 1172 | char *s; |
| 1173 | |
| 1174 | if(!(d->exited && d->closed)) |
| 1175 | return; |
| 1176 | byte_xasprintf(&s, "\n" |
| 1177 | "Server stats:\n" |
| 1178 | "track lookup cache hits: %lu\n" |
| 1179 | "track lookup cache misses: %lu\n", |
| 1180 | cache_files_hits, |
| 1181 | cache_files_misses); |
| 1182 | dynstr_append_string(d->data, s); |
| 1183 | dynstr_terminate(d->data); |
| 1184 | d->done(d->data->vec, d->u); |
| 1185 | } |
| 1186 | |
| 1187 | static int stats_finished(ev_source attribute((unused)) *ev, |
| 1188 | pid_t attribute((unused)) pid, |
| 1189 | int status, |
| 1190 | const struct rusage attribute((unused)) *rusage, |
| 1191 | void *u) { |
| 1192 | struct stats_details *const d = u; |
| 1193 | |
| 1194 | d->exited = 1; |
| 1195 | if(status) |
| 1196 | error(0, "disorder-stats %s", wstat(status)); |
| 1197 | stats_complete(d); |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
| 1201 | static int stats_read(ev_source attribute((unused)) *ev, |
| 1202 | ev_reader *reader, |
| 1203 | void *ptr, |
| 1204 | size_t bytes, |
| 1205 | int eof, |
| 1206 | void *u) { |
| 1207 | struct stats_details *const d = u; |
| 1208 | |
| 1209 | dynstr_append_bytes(d->data, ptr, bytes); |
| 1210 | ev_reader_consume(reader, bytes); |
| 1211 | if(eof) |
| 1212 | d->closed = 1; |
| 1213 | stats_complete(d); |
| 1214 | return 0; |
| 1215 | } |
| 1216 | |
| 1217 | static int stats_error(ev_source attribute((unused)) *ev, |
| 1218 | int errno_value, |
| 1219 | void *u) { |
| 1220 | struct stats_details *const d = u; |
| 1221 | |
| 1222 | error(errno_value, "error reading from pipe to disorder-stats"); |
| 1223 | d->closed = 1; |
| 1224 | stats_complete(d); |
| 1225 | return 0; |
| 1226 | } |
| 1227 | |
| 1228 | void trackdb_stats_subprocess(ev_source *ev, |
| 1229 | void (*done)(char *data, void *u), |
| 1230 | void *u) { |
| 1231 | int p[2]; |
| 1232 | pid_t pid; |
| 1233 | struct stats_details *d = xmalloc(sizeof *d); |
| 1234 | |
| 1235 | dynstr_init(d->data); |
| 1236 | d->done = done; |
| 1237 | d->u = u; |
| 1238 | xpipe(p); |
| 1239 | pid = subprogram(ev, "disorder-stats", p[1]); |
| 1240 | xclose(p[1]); |
| 1241 | ev_child(ev, pid, 0, stats_finished, d); |
| 1242 | ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader"); |
| 1243 | } |
| 1244 | |
| 1245 | /* set a pref (remove if value=0) */ |
| 1246 | int trackdb_set(const char *track, |
| 1247 | const char *name, |
| 1248 | const char *value) { |
| 1249 | struct kvp *t, *p, *a; |
| 1250 | DB_TXN *tid; |
| 1251 | int err, cmp; |
| 1252 | char *oldalias, *newalias, **oldtags = 0, **newtags; |
| 1253 | |
| 1254 | if(value) { |
| 1255 | /* TODO: if value matches default then set value=0 */ |
| 1256 | } |
| 1257 | |
| 1258 | for(;;) { |
| 1259 | tid = trackdb_begin_transaction(); |
| 1260 | if((err = gettrackdata(track, &t, &p, 0, |
| 1261 | 0, tid)) == DB_LOCK_DEADLOCK) |
| 1262 | goto fail; |
| 1263 | if(err == DB_NOTFOUND) break; |
| 1264 | if(name[0] == '_') { |
| 1265 | if(kvp_set(&t, name, value)) |
| 1266 | if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)) |
| 1267 | goto fail; |
| 1268 | } else { |
| 1269 | /* get the old alias name */ |
| 1270 | if(compute_alias(&oldalias, track, p, tid)) goto fail; |
| 1271 | /* get the old tags */ |
| 1272 | if(!strcmp(name, "tags")) |
| 1273 | oldtags = parsetags(kvp_get(p, "tags")); |
| 1274 | /* set the value */ |
| 1275 | if(kvp_set(&p, name, value)) |
| 1276 | if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0)) |
| 1277 | goto fail; |
| 1278 | /* compute the new alias name */ |
| 1279 | if((err = compute_alias(&newalias, track, p, tid))) goto fail; |
| 1280 | /* check whether alias has changed */ |
| 1281 | if(!(oldalias == newalias |
| 1282 | || (oldalias && newalias && !strcmp(oldalias, newalias)))) { |
| 1283 | /* adjust alias records to fit change */ |
| 1284 | if(oldalias |
| 1285 | && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail; |
| 1286 | if(newalias) { |
| 1287 | a = 0; |
| 1288 | kvp_set(&a, "_alias_for", track); |
| 1289 | if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail; |
| 1290 | } |
| 1291 | } |
| 1292 | /* check whether tags have changed */ |
| 1293 | if(!strcmp(name, "tags")) { |
| 1294 | newtags = parsetags(value); |
| 1295 | while(*oldtags || *newtags) { |
| 1296 | if(*oldtags && *newtags) { |
| 1297 | cmp = strcmp(*oldtags, *newtags); |
| 1298 | if(!cmp) { |
| 1299 | /* keeping this tag */ |
| 1300 | ++oldtags; |
| 1301 | ++newtags; |
| 1302 | } else if(cmp < 0) |
| 1303 | /* old tag fits into a gap in the new list, so delete old */ |
| 1304 | goto delete_old; |
| 1305 | else |
| 1306 | /* new tag fits into a gap in the old list, so insert new */ |
| 1307 | goto insert_new; |
| 1308 | } else if(*oldtags) { |
| 1309 | /* we've run out of new tags, so remaining old ones are to be |
| 1310 | * deleted */ |
| 1311 | delete_old: |
| 1312 | if(trackdb_delkeydata(trackdb_tagsdb, |
| 1313 | *oldtags, track, tid) == DB_LOCK_DEADLOCK) |
| 1314 | goto fail; |
| 1315 | ++oldtags; |
| 1316 | } else { |
| 1317 | /* we've run out of old tags, so remainig new ones are to be |
| 1318 | * inserted */ |
| 1319 | insert_new: |
| 1320 | if(register_tag(track, *newtags, tid)) goto fail; |
| 1321 | ++newtags; |
| 1322 | } |
| 1323 | } |
| 1324 | reqtracks = 0; |
| 1325 | } |
| 1326 | } |
| 1327 | err = 0; |
| 1328 | break; |
| 1329 | fail: |
| 1330 | trackdb_abort_transaction(tid); |
| 1331 | } |
| 1332 | trackdb_commit_transaction(tid); |
| 1333 | return err == 0 ? 0 : -1; |
| 1334 | } |
| 1335 | |
| 1336 | /* get a pref */ |
| 1337 | const char *trackdb_get(const char *track, |
| 1338 | const char *name) { |
| 1339 | return kvp_get(trackdb_get_all(track), name); |
| 1340 | } |
| 1341 | |
| 1342 | /* get all prefs as a 0-terminated array */ |
| 1343 | struct kvp *trackdb_get_all(const char *track) { |
| 1344 | struct kvp *t, *p, **pp; |
| 1345 | DB_TXN *tid; |
| 1346 | |
| 1347 | for(;;) { |
| 1348 | tid = trackdb_begin_transaction(); |
| 1349 | if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK) |
| 1350 | goto fail; |
| 1351 | break; |
| 1352 | fail: |
| 1353 | trackdb_abort_transaction(tid); |
| 1354 | } |
| 1355 | trackdb_commit_transaction(tid); |
| 1356 | for(pp = &p; *pp; pp = &(*pp)->next) |
| 1357 | ; |
| 1358 | *pp = t; |
| 1359 | return p; |
| 1360 | } |
| 1361 | |
| 1362 | /* resolve alias */ |
| 1363 | const char *trackdb_resolve(const char *track) { |
| 1364 | DB_TXN *tid; |
| 1365 | const char *actual; |
| 1366 | |
| 1367 | for(;;) { |
| 1368 | tid = trackdb_begin_transaction(); |
| 1369 | if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK) |
| 1370 | goto fail; |
| 1371 | break; |
| 1372 | fail: |
| 1373 | trackdb_abort_transaction(tid); |
| 1374 | } |
| 1375 | trackdb_commit_transaction(tid); |
| 1376 | return actual; |
| 1377 | } |
| 1378 | |
| 1379 | int trackdb_isalias(const char *track) { |
| 1380 | const char *actual = trackdb_resolve(track); |
| 1381 | |
| 1382 | return strcmp(actual, track); |
| 1383 | } |
| 1384 | |
| 1385 | /* test whether a track exists (perhaps an alias) */ |
| 1386 | int trackdb_exists(const char *track) { |
| 1387 | DB_TXN *tid; |
| 1388 | int err; |
| 1389 | |
| 1390 | for(;;) { |
| 1391 | tid = trackdb_begin_transaction(); |
| 1392 | /* unusually, here we want the return value */ |
| 1393 | if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK) |
| 1394 | goto fail; |
| 1395 | break; |
| 1396 | fail: |
| 1397 | trackdb_abort_transaction(tid); |
| 1398 | } |
| 1399 | trackdb_commit_transaction(tid); |
| 1400 | return (err == 0); |
| 1401 | } |
| 1402 | |
| 1403 | /* return the list of tags */ |
| 1404 | char **trackdb_alltags(void) { |
| 1405 | DB_TXN *tid; |
| 1406 | int err; |
| 1407 | char **taglist; |
| 1408 | |
| 1409 | for(;;) { |
| 1410 | tid = trackdb_begin_transaction(); |
| 1411 | err = trackdb_alltags_tid(tid, &taglist); |
| 1412 | if(!err) break; |
| 1413 | trackdb_abort_transaction(tid); |
| 1414 | } |
| 1415 | trackdb_commit_transaction(tid); |
| 1416 | return taglist; |
| 1417 | } |
| 1418 | |
| 1419 | static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) { |
| 1420 | struct vector v; |
| 1421 | DBC *c; |
| 1422 | DBT k, d; |
| 1423 | int err; |
| 1424 | |
| 1425 | vector_init(&v); |
| 1426 | c = trackdb_opencursor(trackdb_tagsdb, tid); |
| 1427 | memset(&k, 0, sizeof k); |
| 1428 | while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP))) |
| 1429 | vector_append(&v, xstrndup(k.data, k.size)); |
| 1430 | switch(err) { |
| 1431 | case DB_NOTFOUND: |
| 1432 | break; |
| 1433 | case DB_LOCK_DEADLOCK: |
| 1434 | return err; |
| 1435 | default: |
| 1436 | fatal(0, "c->c_get: %s", db_strerror(err)); |
| 1437 | } |
| 1438 | if((err = trackdb_closecursor(c))) return err; |
| 1439 | vector_terminate(&v); |
| 1440 | *taglistp = v.vec; |
| 1441 | return 0; |
| 1442 | } |
| 1443 | |
| 1444 | /* return 1 iff sorted tag lists A and B have at least one member in common */ |
| 1445 | static int tag_intersection(char **a, char **b) { |
| 1446 | int cmp; |
| 1447 | |
| 1448 | /* Same sort of logic as trackdb_set() above */ |
| 1449 | while(*a && *b) { |
| 1450 | if(!(cmp = strcmp(*a, *b))) return 1; |
| 1451 | else if(cmp < 0) ++a; |
| 1452 | else ++b; |
| 1453 | } |
| 1454 | return 0; |
| 1455 | } |
| 1456 | |
| 1457 | /* Check whether a track is suitable for random play. Returns 0 if it is, |
| 1458 | * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us |
| 1459 | * that. */ |
| 1460 | static int check_suitable(const char *track, |
| 1461 | DB_TXN *tid, |
| 1462 | char **required_tags, |
| 1463 | char **prohibited_tags) { |
| 1464 | char **track_tags; |
| 1465 | time_t last, now; |
| 1466 | struct kvp *p, *t; |
| 1467 | const char *pick_at_random, *played_time; |
| 1468 | |
| 1469 | /* don't pick tracks that aren't in any surviving collection (for instance |
| 1470 | * you've edited the config but the rescan hasn't done its job yet) */ |
| 1471 | if(!find_track_root(track)) { |
| 1472 | info("found track not in any collection: %s", track); |
| 1473 | return DB_NOTFOUND; |
| 1474 | } |
| 1475 | /* don't pick aliases - only pick the canonical form */ |
| 1476 | if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK) |
| 1477 | return DB_LOCK_DEADLOCK; |
| 1478 | if(kvp_get(t, "_alias_for")) |
| 1479 | return DB_NOTFOUND; |
| 1480 | /* check that random play is not suppressed for this track */ |
| 1481 | if((pick_at_random = kvp_get(p, "pick_at_random")) |
| 1482 | && !strcmp(pick_at_random, "0")) |
| 1483 | return DB_NOTFOUND; |
| 1484 | /* don't pick a track that's been played in the last 8 hours */ |
| 1485 | if((played_time = kvp_get(p, "played_time"))) { |
| 1486 | last = atoll(played_time); |
| 1487 | now = time(0); |
| 1488 | if(now < last + 8 * 3600) /* TODO configurable */ |
| 1489 | return DB_NOTFOUND; |
| 1490 | } |
| 1491 | track_tags = parsetags(kvp_get(p, "tags")); |
| 1492 | /* check that no prohibited tag is present for this track */ |
| 1493 | if(prohibited_tags && tag_intersection(track_tags, prohibited_tags)) |
| 1494 | return DB_NOTFOUND; |
| 1495 | /* check that at least one required tags is present for this track */ |
| 1496 | if(*required_tags && !tag_intersection(track_tags, required_tags)) |
| 1497 | return DB_NOTFOUND; |
| 1498 | return 0; |
| 1499 | } |
| 1500 | |
| 1501 | /* attempt to pick a random non-alias track */ |
| 1502 | const char *trackdb_random(int tries) { |
| 1503 | DBT key, data; |
| 1504 | DB_BTREE_STAT *sp; |
| 1505 | int err, n; |
| 1506 | DB_TXN *tid; |
| 1507 | const char *track, *candidate; |
| 1508 | db_recno_t r; |
| 1509 | const char *tags; |
| 1510 | char **required_tags, **prohibited_tags, **tp; |
| 1511 | hash *h; |
| 1512 | DBC *c = 0; |
| 1513 | |
| 1514 | for(;;) { |
| 1515 | tid = trackdb_begin_transaction(); |
| 1516 | if((err = trackdb_get_global_tid("required-tags", tid, &tags))) |
| 1517 | goto fail; |
| 1518 | required_tags = parsetags(tags); |
| 1519 | if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags))) |
| 1520 | goto fail; |
| 1521 | prohibited_tags = parsetags(tags); |
| 1522 | track = 0; |
| 1523 | if(*required_tags) { |
| 1524 | /* Bung all the suitable tracks into a hash and convert to a list of keys |
| 1525 | * (to eliminate duplicates). We cache this list since it is possible |
| 1526 | * that it will be very large. */ |
| 1527 | if(!reqtracks) { |
| 1528 | h = hash_new(0); |
| 1529 | for(tp = required_tags; *tp; ++tp) { |
| 1530 | c = trackdb_opencursor(trackdb_tagsdb, tid); |
| 1531 | memset(&key, 0, sizeof key); |
| 1532 | key.data = *tp; |
| 1533 | key.size = strlen(*tp); |
| 1534 | n = 0; |
| 1535 | err = c->c_get(c, &key, prepare_data(&data), DB_SET); |
| 1536 | while(err == 0) { |
| 1537 | hash_add(h, xstrndup(data.data, data.size), 0, |
| 1538 | HASH_INSERT_OR_REPLACE); |
| 1539 | ++n; |
| 1540 | err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP); |
| 1541 | } |
| 1542 | switch(err) { |
| 1543 | case 0: |
| 1544 | case DB_NOTFOUND: |
| 1545 | break; |
| 1546 | case DB_LOCK_DEADLOCK: |
| 1547 | goto fail; |
| 1548 | default: |
| 1549 | fatal(0, "error querying tags.db: %s", db_strerror(err)); |
| 1550 | } |
| 1551 | trackdb_closecursor(c); |
| 1552 | c = 0; |
| 1553 | if(!n) |
| 1554 | error(0, "required tag %s does not match any tracks", *tp); |
| 1555 | } |
| 1556 | nreqtracks = hash_count(h); |
| 1557 | reqtracks = hash_keys(h); |
| 1558 | } |
| 1559 | while(nreqtracks && !track && tries-- > 0) { |
| 1560 | r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0)); |
| 1561 | candidate = reqtracks[r]; |
| 1562 | switch(check_suitable(candidate, tid, |
| 1563 | required_tags, prohibited_tags)) { |
| 1564 | case 0: |
| 1565 | track = candidate; |
| 1566 | break; |
| 1567 | case DB_NOTFOUND: |
| 1568 | break; |
| 1569 | case DB_LOCK_DEADLOCK: |
| 1570 | goto fail; |
| 1571 | } |
| 1572 | } |
| 1573 | } else { |
| 1574 | /* No required tags. We pick random record numbers in the database |
| 1575 | * instead. */ |
| 1576 | switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) { |
| 1577 | case 0: |
| 1578 | break; |
| 1579 | case DB_LOCK_DEADLOCK: |
| 1580 | error(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1581 | goto fail; |
| 1582 | default: |
| 1583 | fatal(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1584 | } |
| 1585 | if(!sp->bt_nkeys) |
| 1586 | error(0, "cannot pick tracks at random from an empty database"); |
| 1587 | while(sp->bt_nkeys && !track && tries-- > 0) { |
| 1588 | /* record numbers count from 1 upwards */ |
| 1589 | r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0)); |
| 1590 | memset(&key, sizeof key, 0); |
| 1591 | key.flags = DB_DBT_MALLOC; |
| 1592 | key.size = sizeof r; |
| 1593 | key.data = &r; |
| 1594 | switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data), |
| 1595 | DB_SET_RECNO)) { |
| 1596 | case 0: |
| 1597 | break; |
| 1598 | case DB_LOCK_DEADLOCK: |
| 1599 | error(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1600 | goto fail; |
| 1601 | default: |
| 1602 | fatal(0, "error querying tracks.db: %s", db_strerror(err)); |
| 1603 | } |
| 1604 | candidate = xstrndup(key.data, key.size); |
| 1605 | switch(check_suitable(candidate, tid, |
| 1606 | required_tags, prohibited_tags)) { |
| 1607 | case 0: |
| 1608 | track = candidate; |
| 1609 | break; |
| 1610 | case DB_NOTFOUND: |
| 1611 | break; |
| 1612 | case DB_LOCK_DEADLOCK: |
| 1613 | goto fail; |
| 1614 | } |
| 1615 | } |
| 1616 | } |
| 1617 | break; |
| 1618 | fail: |
| 1619 | trackdb_closecursor(c); |
| 1620 | c = 0; |
| 1621 | trackdb_abort_transaction(tid); |
| 1622 | } |
| 1623 | trackdb_commit_transaction(tid); |
| 1624 | if(!track) |
| 1625 | error(0, "could not pick a random track"); |
| 1626 | return track; |
| 1627 | } |
| 1628 | |
| 1629 | /* get a track name given the prefs. Set *used_db to 1 if we got the answer |
| 1630 | * from the prefs. */ |
| 1631 | static const char *getpart(const char *track, |
| 1632 | const char *context, |
| 1633 | const char *part, |
| 1634 | const struct kvp *p, |
| 1635 | int *used_db) { |
| 1636 | const char *result; |
| 1637 | char *pref; |
| 1638 | |
| 1639 | byte_xasprintf(&pref, "trackname_%s_%s", context, part); |
| 1640 | if((result = kvp_get(p, pref))) |
| 1641 | *used_db = 1; |
| 1642 | else |
| 1643 | result = trackname_part(track, context, part); |
| 1644 | assert(result != 0); |
| 1645 | return result; |
| 1646 | } |
| 1647 | |
| 1648 | /* get a track name part, like trackname_part(), but taking the database into |
| 1649 | * account. */ |
| 1650 | const char *trackdb_getpart(const char *track, |
| 1651 | const char *context, |
| 1652 | const char *part) { |
| 1653 | struct kvp *p; |
| 1654 | DB_TXN *tid; |
| 1655 | char *pref; |
| 1656 | const char *actual; |
| 1657 | int used_db, err; |
| 1658 | |
| 1659 | /* construct the full pref */ |
| 1660 | byte_xasprintf(&pref, "trackname_%s_%s", context, part); |
| 1661 | for(;;) { |
| 1662 | tid = trackdb_begin_transaction(); |
| 1663 | if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK) |
| 1664 | goto fail; |
| 1665 | break; |
| 1666 | fail: |
| 1667 | trackdb_abort_transaction(tid); |
| 1668 | } |
| 1669 | trackdb_commit_transaction(tid); |
| 1670 | return getpart(actual, context, part, p, &used_db); |
| 1671 | } |
| 1672 | |
| 1673 | /* get the raw path name for @track@ (might be an alias) */ |
| 1674 | const char *trackdb_rawpath(const char *track) { |
| 1675 | DB_TXN *tid; |
| 1676 | struct kvp *t; |
| 1677 | const char *path; |
| 1678 | |
| 1679 | for(;;) { |
| 1680 | tid = trackdb_begin_transaction(); |
| 1681 | if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK) |
| 1682 | goto fail; |
| 1683 | break; |
| 1684 | fail: |
| 1685 | trackdb_abort_transaction(tid); |
| 1686 | } |
| 1687 | trackdb_commit_transaction(tid); |
| 1688 | if(!(path = kvp_get(t, "_path"))) path = track; |
| 1689 | return path; |
| 1690 | } |
| 1691 | |
| 1692 | /* trackdb_list **************************************************************/ |
| 1693 | |
| 1694 | /* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually |
| 1695 | * readable at some point */ |
| 1696 | |
| 1697 | /* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE. |
| 1698 | * If RE is a null pointer then it matches everything. */ |
| 1699 | static int track_matches(size_t dl, const char *track, size_t tl, |
| 1700 | const pcre *re) { |
| 1701 | int ovec[3], rc; |
| 1702 | |
| 1703 | if(!re) |
| 1704 | return 1; |
| 1705 | track += dl + 1; |
| 1706 | tl -= (dl + 1); |
| 1707 | switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) { |
| 1708 | case PCRE_ERROR_NOMATCH: return 0; |
| 1709 | default: |
| 1710 | if(rc < 0) { |
| 1711 | error(0, "pcre_exec returned %d, subject '%s'", rc, track); |
| 1712 | return 0; |
| 1713 | } |
| 1714 | return 1; |
| 1715 | } |
| 1716 | } |
| 1717 | |
| 1718 | static int do_list(struct vector *v, const char *dir, |
| 1719 | enum trackdb_listable what, const pcre *re, DB_TXN *tid) { |
| 1720 | DBC *cursor; |
| 1721 | DBT k, d; |
| 1722 | size_t dl; |
| 1723 | char *ptr; |
| 1724 | int err; |
| 1725 | size_t l, last_dir_len = 0; |
| 1726 | char *last_dir = 0, *track, *alias; |
| 1727 | struct kvp *p; |
| 1728 | |
| 1729 | dl = strlen(dir); |
| 1730 | cursor = trackdb_opencursor(trackdb_tracksdb, tid); |
| 1731 | make_key(&k, dir); |
| 1732 | prepare_data(&d); |
| 1733 | /* find the first key >= dir */ |
| 1734 | err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE); |
| 1735 | /* keep going while we're dealing with <dir/anything> */ |
| 1736 | while(err == 0 |
| 1737 | && k.size > dl |
| 1738 | && ((char *)k.data)[dl] == '/' |
| 1739 | && !memcmp(k.data, dir, dl)) { |
| 1740 | ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1)); |
| 1741 | if(ptr) { |
| 1742 | /* we have <dir/component/anything>, so <dir/component> is a directory */ |
| 1743 | l = ptr - (char *)k.data; |
| 1744 | if(what & trackdb_directories) |
| 1745 | if(!(last_dir |
| 1746 | && l == last_dir_len |
| 1747 | && !memcmp(last_dir, k.data, l))) { |
| 1748 | last_dir = xstrndup(k.data, last_dir_len = l); |
| 1749 | if(track_matches(dl, k.data, l, re)) |
| 1750 | vector_append(v, last_dir); |
| 1751 | } |
| 1752 | } else { |
| 1753 | /* found a plain file */ |
| 1754 | if((what & trackdb_files)) { |
| 1755 | track = xstrndup(k.data, k.size); |
| 1756 | if((err = trackdb_getdata(trackdb_prefsdb, |
| 1757 | track, &p, tid)) == DB_LOCK_DEADLOCK) |
| 1758 | goto deadlocked; |
| 1759 | /* if this file has an alias in the same directory then we skip it */ |
| 1760 | if((err = compute_alias(&alias, track, p, tid))) |
| 1761 | goto deadlocked; |
| 1762 | if(!(alias && !strcmp(d_dirname(alias), d_dirname(track)))) |
| 1763 | if(track_matches(dl, k.data, k.size, re)) |
| 1764 | vector_append(v, track); |
| 1765 | } |
| 1766 | } |
| 1767 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); |
| 1768 | } |
| 1769 | switch(err) { |
| 1770 | case 0: |
| 1771 | break; |
| 1772 | case DB_NOTFOUND: |
| 1773 | err = 0; |
| 1774 | break; |
| 1775 | case DB_LOCK_DEADLOCK: |
| 1776 | error(0, "error querying database: %s", db_strerror(err)); |
| 1777 | break; |
| 1778 | default: |
| 1779 | fatal(0, "error querying database: %s", db_strerror(err)); |
| 1780 | } |
| 1781 | deadlocked: |
| 1782 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; |
| 1783 | return err; |
| 1784 | } |
| 1785 | |
| 1786 | /* return the directories or files below @dir@ */ |
| 1787 | char **trackdb_list(const char *dir, int *np, enum trackdb_listable what, |
| 1788 | const pcre *re) { |
| 1789 | DB_TXN *tid; |
| 1790 | int n; |
| 1791 | struct vector v; |
| 1792 | |
| 1793 | vector_init(&v); |
| 1794 | for(;;) { |
| 1795 | tid = trackdb_begin_transaction(); |
| 1796 | v.nvec = 0; |
| 1797 | if(dir) { |
| 1798 | if(do_list(&v, dir, what, re, tid)) |
| 1799 | goto fail; |
| 1800 | } else { |
| 1801 | for(n = 0; n < config->collection.n; ++n) |
| 1802 | if(do_list(&v, config->collection.s[n].root, what, re, tid)) |
| 1803 | goto fail; |
| 1804 | } |
| 1805 | break; |
| 1806 | fail: |
| 1807 | trackdb_abort_transaction(tid); |
| 1808 | } |
| 1809 | trackdb_commit_transaction(tid); |
| 1810 | vector_terminate(&v); |
| 1811 | if(np) |
| 1812 | *np = v.nvec; |
| 1813 | return v.vec; |
| 1814 | } |
| 1815 | |
| 1816 | /* If S is tag:something, return something. Else return 0. */ |
| 1817 | static const char *checktag(const char *s) { |
| 1818 | if(!strncmp(s, "tag:", 4)) |
| 1819 | return s + 4; |
| 1820 | else |
| 1821 | return 0; |
| 1822 | } |
| 1823 | |
| 1824 | /* return a list of tracks containing all of the words given. If you |
| 1825 | * ask for only stopwords you get no tracks. */ |
| 1826 | char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) { |
| 1827 | const char **w, *best = 0, *tag; |
| 1828 | char **twords, **tags; |
| 1829 | int i, j, n, err, what; |
| 1830 | DBC *cursor = 0; |
| 1831 | DBT k, d; |
| 1832 | struct vector u, v; |
| 1833 | DB_TXN *tid; |
| 1834 | struct kvp *p; |
| 1835 | int ntags = 0; |
| 1836 | DB *db; |
| 1837 | const char *dbname; |
| 1838 | |
| 1839 | *ntracks = 0; /* for early returns */ |
| 1840 | /* normalize all the words */ |
| 1841 | w = xmalloc(nwordlist * sizeof (char *)); |
| 1842 | for(n = 0; n < nwordlist; ++n) { |
| 1843 | uint32_t *w32; |
| 1844 | size_t nw32; |
| 1845 | |
| 1846 | w[n] = utf8_casefold_compat(wordlist[n], strlen(wordlist[n]), 0); |
| 1847 | if(checktag(w[n])) ++ntags; /* count up tags */ |
| 1848 | /* Strip out combining characters (AFTER checking whether it's a tag) */ |
| 1849 | if(!(w32 = utf8_to_utf32(w[n], strlen(w[n]), &nw32))) |
| 1850 | return 0; |
| 1851 | nw32 = remove_combining_chars(w32, nw32); |
| 1852 | if(!(w[n] = utf32_to_utf8(w32, nw32, 0))) |
| 1853 | return 0; |
| 1854 | } |
| 1855 | /* find the longest non-stopword */ |
| 1856 | for(n = 0; n < nwordlist; ++n) |
| 1857 | if(!stopword(w[n]) && !checktag(w[n])) |
| 1858 | if(!best || strlen(w[n]) > strlen(best)) |
| 1859 | best = w[n]; |
| 1860 | /* TODO: we should at least in principal be able to identify the word or tag |
| 1861 | * with the least matches in log time, and choose that as our primary search |
| 1862 | * term. */ |
| 1863 | if(ntags && !best) { |
| 1864 | /* Only tags are listed. We limit to the first and narrow down with the |
| 1865 | * rest. */ |
| 1866 | best = checktag(w[0]); |
| 1867 | db = trackdb_tagsdb; |
| 1868 | dbname = "tags"; |
| 1869 | } else if(best) { |
| 1870 | /* We can limit to some word. */ |
| 1871 | db = trackdb_searchdb; |
| 1872 | dbname = "search"; |
| 1873 | } else { |
| 1874 | /* Only stopwords */ |
| 1875 | return 0; |
| 1876 | } |
| 1877 | vector_init(&u); |
| 1878 | vector_init(&v); |
| 1879 | for(;;) { |
| 1880 | tid = trackdb_begin_transaction(); |
| 1881 | /* find all the tracks that have that word */ |
| 1882 | make_key(&k, best); |
| 1883 | prepare_data(&d); |
| 1884 | what = DB_SET; |
| 1885 | v.nvec = 0; |
| 1886 | cursor = trackdb_opencursor(db, tid); |
| 1887 | while(!(err = cursor->c_get(cursor, &k, &d, what))) { |
| 1888 | vector_append(&v, xstrndup(d.data, d.size)); |
| 1889 | what = DB_NEXT_DUP; |
| 1890 | } |
| 1891 | switch(err) { |
| 1892 | case DB_NOTFOUND: |
| 1893 | err = 0; |
| 1894 | break; |
| 1895 | case DB_LOCK_DEADLOCK: |
| 1896 | error(0, "error querying %s database: %s", dbname, db_strerror(err)); |
| 1897 | break; |
| 1898 | default: |
| 1899 | fatal(0, "error querying %s database: %s", dbname, db_strerror(err)); |
| 1900 | } |
| 1901 | if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK; |
| 1902 | cursor = 0; |
| 1903 | /* do a naive search over that (hopefuly fairly small) list of tracks */ |
| 1904 | u.nvec = 0; |
| 1905 | for(n = 0; n < v.nvec; ++n) { |
| 1906 | if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)) |
| 1907 | goto fail; |
| 1908 | else if(err) { |
| 1909 | error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err)); |
| 1910 | continue; |
| 1911 | } |
| 1912 | twords = track_to_words(v.vec[n], p); |
| 1913 | tags = parsetags(kvp_get(p, "tags")); |
| 1914 | for(i = 0; i < nwordlist; ++i) { |
| 1915 | if((tag = checktag(w[i]))) { |
| 1916 | /* Track must have this tag */ |
| 1917 | for(j = 0; tags[j]; ++j) |
| 1918 | if(!strcmp(tag, tags[j])) break; /* tag found */ |
| 1919 | if(!tags[j]) break; /* tag not found */ |
| 1920 | } else { |
| 1921 | /* Track must contain this word */ |
| 1922 | for(j = 0; twords[j]; ++j) |
| 1923 | if(!strcmp(w[i], twords[j])) break; /* word found */ |
| 1924 | if(!twords[j]) break; /* word not found */ |
| 1925 | } |
| 1926 | } |
| 1927 | if(i >= nwordlist) /* all words found */ |
| 1928 | vector_append(&u, v.vec[n]); |
| 1929 | } |
| 1930 | break; |
| 1931 | fail: |
| 1932 | trackdb_closecursor(cursor); |
| 1933 | cursor = 0; |
| 1934 | trackdb_abort_transaction(tid); |
| 1935 | info("retrying search"); |
| 1936 | } |
| 1937 | trackdb_commit_transaction(tid); |
| 1938 | vector_terminate(&u); |
| 1939 | if(ntracks) |
| 1940 | *ntracks = u.nvec; |
| 1941 | return u.vec; |
| 1942 | } |
| 1943 | |
| 1944 | /* trackdb_scan **************************************************************/ |
| 1945 | |
| 1946 | int trackdb_scan(const char *root, |
| 1947 | int (*callback)(const char *track, |
| 1948 | struct kvp *data, |
| 1949 | void *u, |
| 1950 | DB_TXN *tid), |
| 1951 | void *u, |
| 1952 | DB_TXN *tid) { |
| 1953 | DBC *cursor; |
| 1954 | DBT k, d; |
| 1955 | const size_t root_len = root ? strlen(root) : 0; |
| 1956 | int err, cberr; |
| 1957 | struct kvp *data; |
| 1958 | const char *track; |
| 1959 | |
| 1960 | cursor = trackdb_opencursor(trackdb_tracksdb, tid); |
| 1961 | if(root) |
| 1962 | err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d), |
| 1963 | DB_SET_RANGE); |
| 1964 | else { |
| 1965 | memset(&k, 0, sizeof k); |
| 1966 | err = cursor->c_get(cursor, &k, prepare_data(&d), |
| 1967 | DB_FIRST); |
| 1968 | } |
| 1969 | while(!err) { |
| 1970 | if(!root |
| 1971 | || (k.size > root_len |
| 1972 | && !strncmp(k.data, root, root_len) |
| 1973 | && ((char *)k.data)[root_len] == '/')) { |
| 1974 | data = kvp_urldecode(d.data, d.size); |
| 1975 | if(kvp_get(data, "_path")) { |
| 1976 | track = xstrndup(k.data, k.size); |
| 1977 | /* Advance to the next track before the callback so that the callback |
| 1978 | * may safely delete the track */ |
| 1979 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); |
| 1980 | if((cberr = callback(track, data, u, tid))) { |
| 1981 | err = cberr; |
| 1982 | break; |
| 1983 | } |
| 1984 | } else |
| 1985 | err = cursor->c_get(cursor, &k, &d, DB_NEXT); |
| 1986 | } else |
| 1987 | break; |
| 1988 | } |
| 1989 | trackdb_closecursor(cursor); |
| 1990 | switch(err) { |
| 1991 | case EINTR: |
| 1992 | return err; |
| 1993 | case 0: |
| 1994 | case DB_NOTFOUND: |
| 1995 | return 0; |
| 1996 | case DB_LOCK_DEADLOCK: |
| 1997 | error(0, "c->c_get: %s", db_strerror(err)); |
| 1998 | return err; |
| 1999 | default: |
| 2000 | fatal(0, "c->c_get: %s", db_strerror(err)); |
| 2001 | } |
| 2002 | } |
| 2003 | |
| 2004 | /* trackdb_rescan ************************************************************/ |
| 2005 | |
| 2006 | /* called when the rescanner terminates */ |
| 2007 | static int reap_rescan(ev_source attribute((unused)) *ev, |
| 2008 | pid_t pid, |
| 2009 | int status, |
| 2010 | const struct rusage attribute((unused)) *rusage, |
| 2011 | void attribute((unused)) *u) { |
| 2012 | if(pid == rescan_pid) rescan_pid = -1; |
| 2013 | if(status) |
| 2014 | error(0, RESCAN": %s", wstat(status)); |
| 2015 | else |
| 2016 | D((RESCAN" terminated: %s", wstat(status))); |
| 2017 | /* Our cache of file lookups is out of date now */ |
| 2018 | cache_clean(&cache_files_type); |
| 2019 | eventlog("rescanned", (char *)0); |
| 2020 | return 0; |
| 2021 | } |
| 2022 | |
| 2023 | void trackdb_rescan(ev_source *ev) { |
| 2024 | int w; |
| 2025 | |
| 2026 | if(rescan_pid != -1) { |
| 2027 | error(0, "rescan already underway"); |
| 2028 | return; |
| 2029 | } |
| 2030 | rescan_pid = subprogram(ev, RESCAN, -1); |
| 2031 | if(ev) { |
| 2032 | ev_child(ev, rescan_pid, 0, reap_rescan, 0); |
| 2033 | D(("started rescanner")); |
| 2034 | } else { |
| 2035 | /* This is the first rescan, we block until it is complete */ |
| 2036 | while(waitpid(rescan_pid, &w, 0) < 0 && errno == EINTR) |
| 2037 | ; |
| 2038 | reap_rescan(0, rescan_pid, w, 0, 0); |
| 2039 | } |
| 2040 | } |
| 2041 | |
| 2042 | int trackdb_rescan_cancel(void) { |
| 2043 | if(rescan_pid == -1) return 0; |
| 2044 | if(kill(rescan_pid, SIGTERM) < 0) |
| 2045 | fatal(errno, "error killing rescanner"); |
| 2046 | rescan_pid = -1; |
| 2047 | return 1; |
| 2048 | } |
| 2049 | |
| 2050 | /* global prefs **************************************************************/ |
| 2051 | |
| 2052 | void trackdb_set_global(const char *name, |
| 2053 | const char *value, |
| 2054 | const char *who) { |
| 2055 | DB_TXN *tid; |
| 2056 | int err; |
| 2057 | int state; |
| 2058 | |
| 2059 | for(;;) { |
| 2060 | tid = trackdb_begin_transaction(); |
| 2061 | if(!(err = trackdb_set_global_tid(name, value, tid))) |
| 2062 | break; |
| 2063 | trackdb_abort_transaction(tid); |
| 2064 | } |
| 2065 | trackdb_commit_transaction(tid); |
| 2066 | /* log important state changes */ |
| 2067 | if(!strcmp(name, "playing")) { |
| 2068 | state = !value || !strcmp(value, "yes"); |
| 2069 | info("playing %s by %s", |
| 2070 | state ? "enabled" : "disabled", |
| 2071 | who ? who : "-"); |
| 2072 | eventlog("state", state ? "enable_play" : "disable_play", (char *)0); |
| 2073 | } |
| 2074 | if(!strcmp(name, "random-play")) { |
| 2075 | state = !value || !strcmp(value, "yes"); |
| 2076 | info("random play %s by %s", |
| 2077 | state ? "enabled" : "disabled", |
| 2078 | who ? who : "-"); |
| 2079 | eventlog("state", state ? "enable_random" : "disable_random", (char *)0); |
| 2080 | } |
| 2081 | if(!strcmp(name, "required-tags")) |
| 2082 | reqtracks = 0; |
| 2083 | } |
| 2084 | |
| 2085 | int trackdb_set_global_tid(const char *name, |
| 2086 | const char *value, |
| 2087 | DB_TXN *tid) { |
| 2088 | DBT k, d; |
| 2089 | int err; |
| 2090 | |
| 2091 | memset(&k, 0, sizeof k); |
| 2092 | memset(&d, 0, sizeof d); |
| 2093 | k.data = (void *)name; |
| 2094 | k.size = strlen(name); |
| 2095 | if(value) { |
| 2096 | d.data = (void *)value; |
| 2097 | d.size = strlen(value); |
| 2098 | } |
| 2099 | if(value) |
| 2100 | err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0); |
| 2101 | else |
| 2102 | err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0); |
| 2103 | if(err == DB_LOCK_DEADLOCK) return err; |
| 2104 | if(err) |
| 2105 | fatal(0, "error updating database: %s", db_strerror(err)); |
| 2106 | return 0; |
| 2107 | } |
| 2108 | |
| 2109 | const char *trackdb_get_global(const char *name) { |
| 2110 | DB_TXN *tid; |
| 2111 | int err; |
| 2112 | const char *r; |
| 2113 | |
| 2114 | for(;;) { |
| 2115 | tid = trackdb_begin_transaction(); |
| 2116 | if(!(err = trackdb_get_global_tid(name, tid, &r))) |
| 2117 | break; |
| 2118 | trackdb_abort_transaction(tid); |
| 2119 | } |
| 2120 | trackdb_commit_transaction(tid); |
| 2121 | return r; |
| 2122 | } |
| 2123 | |
| 2124 | int trackdb_get_global_tid(const char *name, |
| 2125 | DB_TXN *tid, |
| 2126 | const char **rp) { |
| 2127 | DBT k, d; |
| 2128 | int err; |
| 2129 | |
| 2130 | memset(&k, 0, sizeof k); |
| 2131 | k.data = (void *)name; |
| 2132 | k.size = strlen(name); |
| 2133 | switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k, |
| 2134 | prepare_data(&d), 0)) { |
| 2135 | case 0: |
| 2136 | *rp = xstrndup(d.data, d.size); |
| 2137 | return 0; |
| 2138 | case DB_NOTFOUND: |
| 2139 | *rp = 0; |
| 2140 | return 0; |
| 2141 | case DB_LOCK_DEADLOCK: |
| 2142 | return err; |
| 2143 | default: |
| 2144 | fatal(0, "error reading database: %s", db_strerror(err)); |
| 2145 | } |
| 2146 | } |
| 2147 | |
| 2148 | /** @brief Retrieve the most recently added tracks |
| 2149 | * @param ntracksp Where to put count, or 0 |
| 2150 | * @param maxtracks Maximum number of tracks to retrieve |
| 2151 | * @return null-terminated array of track names |
| 2152 | * |
| 2153 | * The most recently added track is first in the array. |
| 2154 | */ |
| 2155 | char **trackdb_new(int *ntracksp, |
| 2156 | int maxtracks) { |
| 2157 | DB_TXN *tid; |
| 2158 | char **tracks; |
| 2159 | |
| 2160 | for(;;) { |
| 2161 | tid = trackdb_begin_transaction(); |
| 2162 | tracks = trackdb_new_tid(ntracksp, maxtracks, tid); |
| 2163 | if(tracks) |
| 2164 | break; |
| 2165 | trackdb_abort_transaction(tid); |
| 2166 | } |
| 2167 | trackdb_commit_transaction(tid); |
| 2168 | return tracks; |
| 2169 | } |
| 2170 | |
| 2171 | /** @brief Retrieve the most recently added tracks |
| 2172 | * @param ntracksp Where to put count, or 0 |
| 2173 | * @param maxtracks Maximum number of tracks to retrieve, or 0 for all |
| 2174 | * @param tid Transaction ID |
| 2175 | * @return null-terminated array of track names, or NULL on deadlock |
| 2176 | * |
| 2177 | * The most recently added track is first in the array. |
| 2178 | */ |
| 2179 | static char **trackdb_new_tid(int *ntracksp, |
| 2180 | int maxtracks, |
| 2181 | DB_TXN *tid) { |
| 2182 | DBC *c; |
| 2183 | DBT k, d; |
| 2184 | int err = 0; |
| 2185 | struct vector tracks[1]; |
| 2186 | |
| 2187 | vector_init(tracks); |
| 2188 | c = trackdb_opencursor(trackdb_noticeddb, tid); |
| 2189 | while((maxtracks <= 0 || tracks->nvec < maxtracks) |
| 2190 | && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV))) |
| 2191 | vector_append(tracks, xstrndup(d.data, d.size)); |
| 2192 | switch(err) { |
| 2193 | case 0: /* hit maxtracks */ |
| 2194 | case DB_NOTFOUND: /* ran out of tracks */ |
| 2195 | break; |
| 2196 | case DB_LOCK_DEADLOCK: |
| 2197 | trackdb_closecursor(c); |
| 2198 | return 0; |
| 2199 | default: |
| 2200 | fatal(0, "error reading noticed.db: %s", db_strerror(err)); |
| 2201 | } |
| 2202 | if((err = trackdb_closecursor(c))) |
| 2203 | return 0; /* deadlock */ |
| 2204 | vector_terminate(tracks); |
| 2205 | if(ntracksp) |
| 2206 | *ntracksp = tracks->nvec; |
| 2207 | return tracks->vec; |
| 2208 | } |
| 2209 | |
| 2210 | /** @brief Expire noticed.db |
| 2211 | * @param earliest Earliest timestamp to keep |
| 2212 | */ |
| 2213 | void trackdb_expire_noticed(time_t earliest) { |
| 2214 | DB_TXN *tid; |
| 2215 | |
| 2216 | for(;;) { |
| 2217 | tid = trackdb_begin_transaction(); |
| 2218 | if(!trackdb_expire_noticed_tid(earliest, tid)) |
| 2219 | break; |
| 2220 | trackdb_abort_transaction(tid); |
| 2221 | } |
| 2222 | trackdb_commit_transaction(tid); |
| 2223 | } |
| 2224 | |
| 2225 | /** @brief Expire noticed.db |
| 2226 | * @param earliest Earliest timestamp to keep |
| 2227 | * @param tid Transaction ID |
| 2228 | * @return 0 or DB_LOCK_DEADLOCK |
| 2229 | */ |
| 2230 | static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) { |
| 2231 | DBC *c; |
| 2232 | DBT k, d; |
| 2233 | int err = 0, ret; |
| 2234 | time_t when; |
| 2235 | uint32_t *kk; |
| 2236 | int count = 0; |
| 2237 | |
| 2238 | c = trackdb_opencursor(trackdb_noticeddb, tid); |
| 2239 | while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) { |
| 2240 | kk = k.data; |
| 2241 | when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1])); |
| 2242 | if(when >= earliest) |
| 2243 | break; |
| 2244 | if((err = c->c_del(c, 0))) { |
| 2245 | if(err != DB_LOCK_DEADLOCK) |
| 2246 | fatal(0, "error deleting expired noticed.db entry: %s", |
| 2247 | db_strerror(err)); |
| 2248 | break; |
| 2249 | } |
| 2250 | ++count; |
| 2251 | } |
| 2252 | if(err == DB_NOTFOUND) |
| 2253 | err = 0; |
| 2254 | if(err && err != DB_LOCK_DEADLOCK) |
| 2255 | fatal(0, "error expiring noticed.db: %s", db_strerror(err)); |
| 2256 | ret = err; |
| 2257 | if((err = trackdb_closecursor(c))) { |
| 2258 | if(err != DB_LOCK_DEADLOCK) |
| 2259 | fatal(0, "error closing cursor: %s", db_strerror(err)); |
| 2260 | ret = err; |
| 2261 | } |
| 2262 | if(!ret && count) |
| 2263 | info("expired %d tracks from noticed.db", count); |
| 2264 | return ret; |
| 2265 | } |
| 2266 | |
| 2267 | /* tidying up ****************************************************************/ |
| 2268 | |
| 2269 | void trackdb_gc(void) { |
| 2270 | int err; |
| 2271 | char **logfiles; |
| 2272 | |
| 2273 | if((err = trackdb_env->txn_checkpoint(trackdb_env, |
| 2274 | config->checkpoint_kbyte, |
| 2275 | config->checkpoint_min, |
| 2276 | 0))) |
| 2277 | fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err)); |
| 2278 | if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE))) |
| 2279 | fatal(0, "trackdb_env->log_archive: %s", db_strerror(err)); |
| 2280 | /* This makes catastrophic recovery impossible. However, the user can still |
| 2281 | * preserve the important data by using disorder-dump to snapshot their |
| 2282 | * prefs, and later to restore it. This is likely to have much small |
| 2283 | * long-term storage requirements than record the db logfiles. */ |
| 2284 | } |
| 2285 | |
| 2286 | /* |
| 2287 | Local Variables: |
| 2288 | c-basic-offset:2 |
| 2289 | comment-column:40 |
| 2290 | fill-column:79 |
| 2291 | indent-tabs-mode:nil |
| 2292 | End: |
| 2293 | */ |