-/*
- * This file is part of DisOrder
- * Copyright (C) 2005, 2006, 2007 Richard Kettlewell
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-/** @file server/trackdb.c
- * @brief Track database */
-
-#include <config.h>
-#include "types.h"
-
-#include <string.h>
-#include <stdio.h>
-#include <db.h>
-#include <sys/socket.h>
-#include <pcre.h>
-#include <assert.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stddef.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <time.h>
-#include <arpa/inet.h>
-#include <sys/wait.h>
-#include <dirent.h>
-#include <sys/stat.h>
-
-#include "event.h"
-#include "mem.h"
-#include "kvp.h"
-#include "log.h"
-#include "vector.h"
-#include "trackdb.h"
-#include "configuration.h"
-#include "syscalls.h"
-#include "wstat.h"
-#include "printf.h"
-#include "filepart.h"
-#include "trackname.h"
-#include "trackdb-int.h"
-#include "logfd.h"
-#include "cache.h"
-#include "eventlog.h"
-#include "hash.h"
-#include "unicode.h"
-#include "unidata.h"
-
-#define RESCAN "disorder-rescan"
-#define DEADLOCK "disorder-deadlock"
-
-static const char *getpart(const char *track,
- const char *context,
- const char *part,
- const struct kvp *p,
- int *used_db);
-static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp);
-static char **trackdb_new_tid(int *ntracksp,
- int maxtracks,
- DB_TXN *tid);
-static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid);
-static char *normalize_tag(const char *s, size_t ns);
-
-const struct cache_type cache_files_type = { 86400 };
-unsigned long cache_files_hits, cache_files_misses;
-
-/** @brief Set by trackdb_open() */
-int trackdb_existing_database;
-
-/* setup and teardown ********************************************************/
-
-static const char *home; /* home had better not change */
-DB_ENV *trackdb_env; /* db environment */
-
-/** @brief The tracks database
- * - Keys are UTF-8(NFC(unicode(path name)))
- * - Values are encoded key-value pairs
- * - Data is reconstructable data about tracks that currently exist
- */
-DB *trackdb_tracksdb;
-
-/** @brief The preferences database
- *
- * - Keys are UTF-8(NFC(unicode(path name)))
- * - Values are encoded key-value pairs
- * - Data is user data about tracks (that might not exist any more)
- * and cannot be reconstructed
- */
-DB *trackdb_prefsdb;
-
-/** @brief The search database
- *
- * - Keys are UTF-8(NFKC(casefold(search term)))
- * - Values are UTF-8(NFC(unicode(path name)))
- * - There can be more than one value per key
- * - Presence of key,value means that path matches the search terms
- * - Only tracks fond in @ref tracks_tracksdb are represented here
- * - This database can be reconstructed, it contains no user data
- */
-DB *trackdb_searchdb;
-
-/** @brief The tags database
- *
- * - Keys are UTF-8(NFKC(casefold(tag)))
- * - Values are UTF-8(NFC(unicode(path name)))
- * - There can be more than one value per key
- * - Presence of key,value means that path matches the tag
- * - This is always in sync with the tags preference
- * - This database can be reconstructed, it contains no user data
- */
-DB *trackdb_tagsdb; /* the tags database */
-
-/** @brief The global preferences database
- * - Keys are UTF-8(NFC(preference))
- * - Values are global preference values
- * - Data is user data and cannot be reconstructed
- */
-DB *trackdb_globaldb; /* global preferences */
-
-/** @brief The noticed database
- * - Keys are 64-bit big-endian timestamps
- * - Values are UTF-8(NFC(unicode(path name)))
- * - There can be more than one value per key
- * - Presence of key,value means that path was added at the given time
- * - Data cannot be reconstructed (but isn't THAT important)
- */
-DB *trackdb_noticeddb; /* when track noticed */
-
-/** @brief The user database
- * - Keys are usernames
- * - Values are encoded key-value pairs
- * - Data is user data and cannot be reconstructed
- */
-DB *trackdb_usersdb;
-
-static pid_t db_deadlock_pid = -1; /* deadlock manager PID */
-static pid_t rescan_pid = -1; /* rescanner PID */
-static int initialized, opened; /* state */
-
-/* tracks matched by required_tags */
-static char **reqtracks;
-static size_t nreqtracks;
-
-/* comparison function for keys */
-static int compare(DB attribute((unused)) *db_,
- const DBT *a, const DBT *b) {
- return compare_path_raw(a->data, a->size, b->data, b->size);
-}
-
-/** @brief Open database environment
- * @param flags Flags word
- *
- * Flags should be one of:
- * - @ref TRACKDB_NO_RECOVER
- * - @ref TRACKDB_NORMAL_RECOVER
- * - @ref TRACKDB_FATAL_RECOVER
- * - @ref TRACKDB_MAY_CREATE
- */
-void trackdb_init(int flags) {
- int err;
- const int recover = flags & TRACKDB_RECOVER_MASK;
- static int recover_type[] = { 0, DB_RECOVER, DB_RECOVER_FATAL };
-
- /* sanity checks */
- assert(initialized == 0);
- ++initialized;
- if(home) {
- if(strcmp(home, config->home))
- fatal(0, "cannot change db home without server restart");
- home = config->home;
- }
-
- if(flags & TRACKDB_MAY_CREATE) {
- DIR *dp;
- struct dirent *de;
- struct stat st;
- char *p;
-
- /* create home directory if it does not exist */
- mkdir(config->home, 0755);
- /* Remove world/group permissions on any regular files already in the
- * database directory. Actually we don't care about all of them but it's
- * easier to just do the lot. This can be revisited if it's a serious
- * practical inconvenience for anyone.
- *
- * The socket, not being a regular file, is excepted.
- */
- if(!(dp = opendir(config->home)))
- fatal(errno, "error reading %s", config->home);
- while((de = readdir(dp))) {
- byte_xasprintf(&p, "%s/%s", config->home, de->d_name);
- if(lstat(p, &st) == 0
- && S_ISREG(st.st_mode)
- && (st.st_mode & 077)) {
- if(chmod(p, st.st_mode & (~(mode_t)077) & 07777) < 0)
- fatal(errno, "cannot chmod %s", p);
- }
- xfree(p);
- }
- closedir(dp);
- }
-
- /* create environment */
- if((err = db_env_create(&trackdb_env, 0))) fatal(0, "db_env_create: %s",
- db_strerror(err));
- if((err = trackdb_env->set_alloc(trackdb_env,
- xmalloc_noptr, xrealloc_noptr, xfree)))
- fatal(0, "trackdb_env->set_alloc: %s", db_strerror(err));
- if((err = trackdb_env->set_lk_max_locks(trackdb_env, 10000)))
- fatal(0, "trackdb_env->set_lk_max_locks: %s", db_strerror(err));
- if((err = trackdb_env->set_lk_max_objects(trackdb_env, 10000)))
- fatal(0, "trackdb_env->set_lk_max_objects: %s", db_strerror(err));
- if((err = trackdb_env->open(trackdb_env, config->home,
- DB_INIT_LOG
- |DB_INIT_LOCK
- |DB_INIT_MPOOL
- |DB_INIT_TXN
- |DB_CREATE
- |recover_type[recover],
- 0600)))
- fatal(0, "trackdb_env->open %s: %s", config->home, db_strerror(err));
- trackdb_env->set_errpfx(trackdb_env, "DB");
- trackdb_env->set_errfile(trackdb_env, stderr);
- trackdb_env->set_verbose(trackdb_env, DB_VERB_DEADLOCK, 1);
- trackdb_env->set_verbose(trackdb_env, DB_VERB_RECOVERY, 1);
- trackdb_env->set_verbose(trackdb_env, DB_VERB_REPLICATION, 1);
- D(("initialized database environment"));
-}
-
-/* called when deadlock manager terminates */
-static int reap_db_deadlock(ev_source attribute((unused)) *ev,
- pid_t attribute((unused)) pid,
- int status,
- const struct rusage attribute((unused)) *rusage,
- void attribute((unused)) *u) {
- db_deadlock_pid = -1;
- if(initialized)
- fatal(0, "deadlock manager unexpectedly terminated: %s",
- wstat(status));
- else
- D(("deadlock manager terminated: %s", wstat(status)));
- return 0;
-}
-
-static pid_t subprogram(ev_source *ev, const char *prog,
- int outputfd) {
- pid_t pid;
-
- /* If we're in the background then trap subprocess stdout/stderr */
- if(!(pid = xfork())) {
- exitfn = _exit;
- if(ev)
- ev_signal_atfork(ev);
- signal(SIGPIPE, SIG_DFL);
- if(outputfd != -1) {
- xdup2(outputfd, 1);
- xclose(outputfd);
- }
- /* If we were negatively niced, undo it. We don't bother checking for
- * error, it's not that important. */
- setpriority(PRIO_PROCESS, 0, 0);
- execlp(prog, prog, "--config", configfile,
- debugging ? "--debug" : "--no-debug",
- log_default == &log_syslog ? "--syslog" : "--no-syslog",
- (char *)0);
- fatal(errno, "error invoking %s", prog);
- }
- return pid;
-}
-
-/* start deadlock manager */
-void trackdb_master(ev_source *ev) {
- assert(db_deadlock_pid == -1);
- db_deadlock_pid = subprogram(ev, DEADLOCK, -1);
- ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0);
- D(("started deadlock manager"));
-}
-
-/* close environment */
-void trackdb_deinit(void) {
- int err;
-
- /* sanity checks */
- assert(initialized == 1);
- --initialized;
-
- /* close the environment */
- if((err = trackdb_env->close(trackdb_env, 0)))
- fatal(0, "trackdb_env->close: %s", db_strerror(err));
-
- if(rescan_pid != -1 && kill(rescan_pid, SIGTERM) < 0)
- fatal(errno, "error killing rescanner");
-
- /* terminate the deadlock manager */
- if(db_deadlock_pid != -1 && kill(db_deadlock_pid, SIGTERM) < 0)
- fatal(errno, "error killing deadlock manager");
- db_deadlock_pid = -1;
-
- D(("deinitialized database environment"));
-}
-
-/* open a specific database */
-static DB *open_db(const char *path,
- u_int32_t dbflags,
- DBTYPE dbtype,
- u_int32_t openflags,
- int mode) {
- int err;
- DB *db;
-
- D(("open %s", path));
- path = config_get_file(path);
- if((err = db_create(&db, trackdb_env, 0)))
- fatal(0, "db_create %s: %s", path, db_strerror(err));
- if(dbflags)
- if((err = db->set_flags(db, dbflags)))
- fatal(0, "db->set_flags %s: %s", path, db_strerror(err));
- if(dbtype == DB_BTREE)
- if((err = db->set_bt_compare(db, compare)))
- fatal(0, "db->set_bt_compare %s: %s", path, db_strerror(err));
- if((err = db->open(db, 0, path, 0, dbtype,
- openflags | DB_AUTO_COMMIT, mode))) {
- if((openflags & DB_CREATE) || errno != ENOENT)
- fatal(0, "db->open %s: %s", path, db_strerror(err));
- db->close(db, 0);
- db = 0;
- }
- return db;
-}
-
-/** @brief Open track databases
- * @param Flags flags word
- *
- * @p flags should be one of:
- * - @p TRACKDB_NO_UPGRADE, if no upgrade should be attempted
- * - @p TRACKDB_CAN_UPGRADE, if an upgrade may be attempted
- * - @p TRACKDB_OPEN_FOR_UPGRADE, if this is disorder-dbupgrade
- */
-void trackdb_open(int flags) {
- int err;
- pid_t pid;
-
- /* sanity checks */
- assert(opened == 0);
- ++opened;
- /* check the database version first */
- trackdb_globaldb = open_db("global.db", 0, DB_HASH, 0, 0666);
- if(trackdb_globaldb) {
- /* This is an existing database */
- const char *s;
- long oldversion;
-
- s = trackdb_get_global("_dbversion");
- /* Close the database again, we'll open it property below */
- if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
- fatal(0, "error closing global.db: %s", db_strerror(err));
- trackdb_globaldb = 0;
- /* Convert version string to an integer */
- oldversion = s ? atol(s) : 1;
- if(oldversion > config->dbversion) {
- /* Database is from the future; we never allow this. */
- fatal(0, "this version of DisOrder is too old for database version %ld",
- oldversion);
- }
- if(oldversion < config->dbversion) {
- /* Database version is out of date */
- switch(flags & TRACKDB_UPGRADE_MASK) {
- case TRACKDB_NO_UPGRADE:
- /* This database needs upgrading but this is not permitted */
- fatal(0, "database needs upgrading from %ld to %ld",
- oldversion, config->dbversion);
- case TRACKDB_CAN_UPGRADE:
- /* This database needs upgrading */
- info("invoking disorder-dbupgrade to upgrade from %ld to %ld",
- oldversion, config->dbversion);
- pid = subprogram(0, "disorder-dbupgrade", -1);
- while(waitpid(pid, &err, 0) == -1 && errno == EINTR)
- ;
- if(err)
- fatal(0, "disorder-dbupgrade %s", wstat(err));
- info("disorder-dbupgrade succeeded");
- break;
- case TRACKDB_OPEN_FOR_UPGRADE:
- break;
- default:
- abort();
- }
- }
- if(oldversion == config->dbversion && (flags & TRACKDB_OPEN_FOR_UPGRADE)) {
- /* This doesn't make any sense */
- fatal(0, "database is already at current version");
- }
- trackdb_existing_database = 1;
- } else {
- if(flags & TRACKDB_OPEN_FOR_UPGRADE) {
- /* Cannot upgrade a new database */
- fatal(0, "cannot upgrade a database that does not exist");
- }
- /* This is a brand new database */
- trackdb_existing_database = 0;
- }
- /* open the databases */
- trackdb_tracksdb = open_db("tracks.db",
- DB_RECNUM, DB_BTREE, DB_CREATE, 0666);
- trackdb_searchdb = open_db("search.db",
- DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
- trackdb_tagsdb = open_db("tags.db",
- DB_DUP|DB_DUPSORT, DB_HASH, DB_CREATE, 0666);
- trackdb_prefsdb = open_db("prefs.db", 0, DB_HASH, DB_CREATE, 0666);
- trackdb_globaldb = open_db("global.db", 0, DB_HASH, DB_CREATE, 0666);
- trackdb_noticeddb = open_db("noticed.db",
- DB_DUPSORT, DB_BTREE, DB_CREATE, 0666);
- trackdb_usersdb = open_db("users.db",
- 0, DB_HASH, DB_CREATE, 0600);
- if(!trackdb_existing_database) {
- /* Stash the database version */
- char buf[32];
-
- assert(!(flags & TRACKDB_OPEN_FOR_UPGRADE));
- snprintf(buf, sizeof buf, "%ld", config->dbversion);
- trackdb_set_global("_dbversion", buf, 0);
- }
- D(("opened databases"));
-}
-
-/* close track databases */
-void trackdb_close(void) {
- int err;
-
- /* sanity checks */
- assert(opened == 1);
- --opened;
- if((err = trackdb_tracksdb->close(trackdb_tracksdb, 0)))
- fatal(0, "error closing tracks.db: %s", db_strerror(err));
- if((err = trackdb_searchdb->close(trackdb_searchdb, 0)))
- fatal(0, "error closing search.db: %s", db_strerror(err));
- if((err = trackdb_tagsdb->close(trackdb_tagsdb, 0)))
- fatal(0, "error closing tags.db: %s", db_strerror(err));
- if((err = trackdb_prefsdb->close(trackdb_prefsdb, 0)))
- fatal(0, "error closing prefs.db: %s", db_strerror(err));
- if((err = trackdb_globaldb->close(trackdb_globaldb, 0)))
- fatal(0, "error closing global.db: %s", db_strerror(err));
- if((err = trackdb_noticeddb->close(trackdb_noticeddb, 0)))
- fatal(0, "error closing noticed.db: %s", db_strerror(err));
- if((err = trackdb_usersdb->close(trackdb_usersdb, 0)))
- fatal(0, "error closing users.db: %s", db_strerror(err));
- trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0;
- trackdb_tagsdb = trackdb_globaldb = 0;
- D(("closed databases"));
-}
-
-/* generic db routines *******************************************************/
-
-/* fetch and decode a database entry. Returns 0, DB_NOTFOUND or
- * DB_LOCK_DEADLOCK. */
-int trackdb_getdata(DB *db,
- const char *track,
- struct kvp **kp,
- DB_TXN *tid) {
- int err;
- DBT key, data;
-
- switch(err = db->get(db, tid, make_key(&key, track),
- prepare_data(&data), 0)) {
- case 0:
- *kp = kvp_urldecode(data.data, data.size);
- return 0;
- case DB_NOTFOUND:
- *kp = 0;
- return err;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying database: %s", db_strerror(err));
- return err;
- default:
- fatal(0, "error querying database: %s", db_strerror(err));
- }
-}
-
-/* encode and store a database entry. Returns 0, DB_KEYEXIST or
- * DB_LOCK_DEADLOCK. */
-int trackdb_putdata(DB *db,
- const char *track,
- const struct kvp *k,
- DB_TXN *tid,
- u_int32_t flags) {
- int err;
- DBT key, data;
-
- switch(err = db->put(db, tid, make_key(&key, track),
- encode_data(&data, k), flags)) {
- case 0:
- case DB_KEYEXIST:
- return err;
- case DB_LOCK_DEADLOCK:
- error(0, "error updating database: %s", db_strerror(err));
- return err;
- default:
- fatal(0, "error updating database: %s", db_strerror(err));
- }
-}
-
-/* delete a database entry */
-int trackdb_delkey(DB *db,
- const char *track,
- DB_TXN *tid) {
- int err;
-
- DBT key;
- switch(err = db->del(db, tid, make_key(&key, track), 0)) {
- case 0:
- case DB_NOTFOUND:
- return 0;
- case DB_LOCK_DEADLOCK:
- error(0, "error updating database: %s", db_strerror(err));
- return err;
- default:
- fatal(0, "error updating database: %s", db_strerror(err));
- }
-}
-
-/* open a database cursor */
-DBC *trackdb_opencursor(DB *db, DB_TXN *tid) {
- int err;
- DBC *c;
-
- switch(err = db->cursor(db, tid, &c, 0)) {
- case 0: break;
- default: fatal(0, "error creating cursor: %s", db_strerror(err));
- }
- return c;
-}
-
-/* close a database cursor; returns 0 or DB_LOCK_DEADLOCK */
-int trackdb_closecursor(DBC *c) {
- int err;
-
- if(!c) return 0;
- switch(err = c->c_close(c)) {
- case 0:
- return err;
- case DB_LOCK_DEADLOCK:
- error(0, "error closing cursor: %s", db_strerror(err));
- return err;
- default:
- fatal(0, "error closing cursor: %s", db_strerror(err));
- }
-}
-
-/* delete a (key,data) pair. Returns 0, DB_NOTFOUND or DB_LOCK_DEADLOCK. */
-int trackdb_delkeydata(DB *db,
- const char *word,
- const char *track,
- DB_TXN *tid) {
- int err;
- DBC *c;
- DBT key, data;
-
- c = trackdb_opencursor(db, tid);
- switch(err = c->c_get(c, make_key(&key, word),
- make_key(&data, track), DB_GET_BOTH)) {
- case 0:
- switch(err = c->c_del(c, 0)) {
- case 0:
- break;
- case DB_KEYEMPTY:
- err = 0;
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error updating database: %s", db_strerror(err));
- break;
- default:
- fatal(0, "c->c_del: %s", db_strerror(err));
- }
- break;
- case DB_NOTFOUND:
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error updating database: %s", db_strerror(err));
- break;
- default:
- fatal(0, "c->c_get: %s", db_strerror(err));
- }
- if(trackdb_closecursor(c)) err = DB_LOCK_DEADLOCK;
- return err;
-}
-
-/* start a transaction */
-DB_TXN *trackdb_begin_transaction(void) {
- DB_TXN *tid;
- int err;
-
- if((err = trackdb_env->txn_begin(trackdb_env, 0, &tid, 0)))
- fatal(0, "trackdb_env->txn_begin: %s", db_strerror(err));
- return tid;
-}
-
-/* abort transaction */
-void trackdb_abort_transaction(DB_TXN *tid) {
- int err;
-
- if(tid)
- if((err = tid->abort(tid)))
- fatal(0, "tid->abort: %s", db_strerror(err));
-}
-
-/* commit transaction */
-void trackdb_commit_transaction(DB_TXN *tid) {
- int err;
-
- if((err = tid->commit(tid, 0)))
- fatal(0, "tid->commit: %s", db_strerror(err));
-}
-
-/* search/tags shared code ***************************************************/
-
-/* comparison function used by dedupe() */
-static int wordcmp(const void *a, const void *b) {
- return strcmp(*(const char **)a, *(const char **)b);
-}
-
-/* sort and de-dupe VEC */
-static char **dedupe(char **vec, int nvec) {
- int m, n;
-
- qsort(vec, nvec, sizeof (char *), wordcmp);
- m = n = 0;
- if(nvec) {
- vec[m++] = vec[0];
- for(n = 1; n < nvec; ++n)
- if(strcmp(vec[n], vec[m - 1]))
- vec[m++] = vec[n];
- }
- vec[m] = 0;
- return vec;
-}
-
-/* update a key/track database. Returns 0 or DB_DEADLOCK. */
-static int register_word(DB *db, const char *what,
- const char *track, const char *word,
- DB_TXN *tid) {
- int err;
- DBT key, data;
-
- switch(err = db->put(db, tid, make_key(&key, word),
- make_key(&data, track), DB_NODUPDATA)) {
- case 0:
- case DB_KEYEXIST:
- return 0;
- case DB_LOCK_DEADLOCK:
- error(0, "error updating %s.db: %s", what, db_strerror(err));
- return err;
- default:
- fatal(0, "error updating %s.db: %s", what, db_strerror(err));
- }
-}
-
-/* search primitives *********************************************************/
-
-/* return true iff NAME is a trackname_display_ pref */
-static int is_display_pref(const char *name) {
- static const char prefix[] = "trackname_display_";
- return !strncmp(name, prefix, (sizeof prefix) - 1);
-}
-
-/** @brief Word_Break property tailor that treats underscores as spaces */
-static int tailor_underscore_Word_Break_Other(uint32_t c) {
- switch(c) {
- default:
- return -1;
- case 0x005F: /* LOW LINE (SPACING UNDERSCORE) */
- return unicode_Word_Break_Other;
- }
-}
-
-/** @brief Remove all combining characters in-place
- * @param s Pointer to start of string
- * @param ns Length of string
- * @return New, possiblby reduced, length
- */
-static size_t remove_combining_chars(uint32_t *s, size_t ns) {
- uint32_t *start = s, *t = s, *end = s + ns;
-
- while(s < end) {
- const uint32_t c = *s++;
- if(!utf32_combining_class(c))
- *t++ = c;
- }
- return t - start;
-}
-
-/** @brief Normalize and split a string using a given tailoring */
-static void word_split(struct vector *v,
- const char *s,
- unicode_property_tailor *pt) {
- size_t nw, nt32, i;
- uint32_t *t32, **w32;
-
- /* Convert to UTF-32 */
- if(!(t32 = utf8_to_utf32(s, strlen(s), &nt32)))
- return;
- /* Erase case distinctions */
- if(!(t32 = utf32_casefold_compat(t32, nt32, &nt32)))
- return;
- /* Drop combining characters */
- nt32 = remove_combining_chars(t32, nt32);
- /* Split into words, treating _ as a space */
- w32 = utf32_word_split(t32, nt32, &nw, pt);
- /* Convert words back to UTF-8 and append to result */
- for(i = 0; i < nw; ++i)
- vector_append(v, utf32_to_utf8(w32[i], utf32_len(w32[i]), 0));
-}
-
-/** @brief Normalize a tag
- * @param s Tag
- * @param ns Length of tag
- * @return Normalized string or NULL on error
- *
- * The return value will be:
- * - case-folded
- * - have no leading or trailing space
- * - have no combining characters
- * - all spacing between words will be a single U+0020 SPACE
- */
-static char *normalize_tag(const char *s, size_t ns) {
- uint32_t *s32, **w32;
- size_t ns32, nw32, i;
- struct dynstr d[1];
-
- if(!(s32 = utf8_to_utf32(s, ns, &ns32)))
- return 0;
- if(!(s32 = utf32_casefold_compat(s32, ns32, &ns32))) /* ->NFKD */
- return 0;
- ns32 = remove_combining_chars(s32, ns32);
- /* Split into words, no Word_Break tailoring */
- w32 = utf32_word_split(s32, ns32, &nw32, 0);
- /* Compose back into a string */
- dynstr_init(d);
- for(i = 0; i < nw32; ++i) {
- if(i)
- dynstr_append(d, ' ');
- dynstr_append_string(d, utf32_to_utf8(w32[i], utf32_len(w32[i]), 0));
- }
- dynstr_terminate(d);
- return d->vec;
-}
-
-/* compute the words of a track name */
-static char **track_to_words(const char *track,
- const struct kvp *p) {
- struct vector v;
- const char *rootless = track_rootless(track);
-
- if(!rootless)
- rootless = track; /* bodge */
- vector_init(&v);
- rootless = strip_extension(rootless);
- word_split(&v, strip_extension(rootless), tailor_underscore_Word_Break_Other);
- for(; p; p = p->next)
- if(is_display_pref(p->name))
- word_split(&v, p->value, 0);
- vector_terminate(&v);
- return dedupe(v.vec, v.nvec);
-}
-
-/* return nonzero iff WORD is a stopword */
-static int stopword(const char *word) {
- int n;
-
- for(n = 0; n < config->stopword.n
- && strcmp(word, config->stopword.s[n]); ++n)
- ;
- return n < config->stopword.n;
-}
-
-/* record that WORD appears in TRACK. Returns 0 or DB_LOCK_DEADLOCK. */
-static int register_search_word(const char *track, const char *word,
- DB_TXN *tid) {
- if(stopword(word)) return 0;
- return register_word(trackdb_searchdb, "search", track, word, tid);
-}
-
-/* Tags **********************************************************************/
-
-/* Return nonzero if C is a valid tag character */
-static int tagchar(int c) {
- switch(c) {
- case ',':
- return 0;
- default:
- return c >= ' ';
- }
-}
-
-/* Parse and de-dupe a tag list. If S=0 then assumes "". */
-static char **parsetags(const char *s) {
- const char *t;
- struct vector v;
-
- vector_init(&v);
- if(s) {
- /* skip initial separators */
- while(*s && (!tagchar(*s) || *s == ' '))
- ++s;
- while(*s) {
- /* find the extent of the tag */
- t = s;
- while(*s && tagchar(*s))
- ++s;
- /* strip trailing spaces */
- while(s > t && s[-1] == ' ')
- --s;
- /* add tag to list */
- vector_append(&v, normalize_tag(t, (size_t)(s - t)));
- /* skip intermediate and trailing separators */
- while(*s && (!tagchar(*s) || *s == ' '))
- ++s;
- }
- }
- vector_terminate(&v);
- return dedupe(v.vec, v.nvec);
-}
-
-/* Record that TRACK has TAG. Returns 0 or DB_LOCK_DEADLOCK. */
-static int register_tag(const char *track, const char *tag, DB_TXN *tid) {
- return register_word(trackdb_tagsdb, "tags", track, tag, tid);
-}
-
-/* aliases *******************************************************************/
-
-/* compute the alias and store at aliasp. Returns 0 or DB_LOCK_DEADLOCK. If
- * there is no alias sets *aliasp to 0. */
-static int compute_alias(char **aliasp,
- const char *track,
- const struct kvp *p,
- DB_TXN *tid) {
- struct dynstr d;
- const char *s = config->alias, *t, *expansion, *part;
- int c, used_db = 0, slash_prefix, err;
- struct kvp *at;
- const char *const root = find_track_root(track);
-
- if(!root) {
- /* Bodge for tracks with no root */
- *aliasp = 0;
- return 0;
- }
- dynstr_init(&d);
- dynstr_append_string(&d, root);
- while((c = (unsigned char)*s++)) {
- if(c != '{') {
- dynstr_append(&d, c);
- continue;
- }
- if((slash_prefix = (*s == '/')))
- s++;
- t = strchr(s, '}');
- assert(t != 0); /* validated at startup */
- part = xstrndup(s, t - s);
- expansion = getpart(track, "display", part, p, &used_db);
- if(*expansion) {
- if(slash_prefix) dynstr_append(&d, '/');
- dynstr_append_string(&d, expansion);
- }
- s = t + 1; /* skip {part} */
- }
- /* only admit to the alias if we used the db... */
- if(!used_db) {
- *aliasp = 0;
- return 0;
- }
- dynstr_terminate(&d);
- /* ...and the answer differs from the original... */
- if(!strcmp(track, d.vec)) {
- *aliasp = 0;
- return 0;
- }
- /* ...and there isn't already a different track with that name (including as
- * an alias) */
- switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) {
- case 0:
- if((s = kvp_get(at, "_alias_for"))
- && !strcmp(s, track)) {
- case DB_NOTFOUND:
- *aliasp = d.vec;
- } else {
- *aliasp = 0;
- }
- return 0;
- default:
- return err;
- }
-}
-
-/* get track and prefs data (if tp/pp not null pointers). Returns 0 on
- * success, DB_NOTFOUND if the track does not exist or DB_LOCK_DEADLOCK.
- * Always sets the return values, even if only to null pointers. */
-static int gettrackdata(const char *track,
- struct kvp **tp,
- struct kvp **pp,
- const char **actualp,
- unsigned flags,
-#define GTD_NOALIAS 0x0001
- DB_TXN *tid) {
- int err;
- const char *actual = track;
- struct kvp *t = 0, *p = 0;
-
- if((err = trackdb_getdata(trackdb_tracksdb, track, &t, tid))) goto done;
- if((actual = kvp_get(t, "_alias_for"))) {
- if(flags & GTD_NOALIAS) {
- error(0, "alias passed to gettrackdata where real path required");
- abort();
- }
- if((err = trackdb_getdata(trackdb_tracksdb, actual, &t, tid))) goto done;
- } else
- actual = track;
- assert(actual != 0);
- if(pp) {
- if((err = trackdb_getdata(trackdb_prefsdb, actual, &p, tid)) == DB_LOCK_DEADLOCK)
- goto done;
- }
- err = 0;
-done:
- if(actualp) *actualp = actual;
- if(tp) *tp = t;
- if(pp) *pp = p;
- return err;
-}
-
-/* trackdb_notice() **********************************************************/
-
-/** @brief notice a possibly new track
- * @return @c DB_NOTFOUND if new, 0 if already known
- */
-int trackdb_notice(const char *track,
- const char *path) {
- int err;
- DB_TXN *tid;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- err = trackdb_notice_tid(track, path, tid);
- if((err == DB_LOCK_DEADLOCK)) goto fail;
- break;
- fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return err;
-}
-
-/** @brief notice a possibly new track
- * @param track NFC UTF-8 track name
- * @param path Raw path name
- * @param tid Transaction ID
- * @return @c DB_NOTFOUND if new, 0 if already known, @c DB_LOCK_DEADLOCK also
- */
-int trackdb_notice_tid(const char *track,
- const char *path,
- DB_TXN *tid) {
- int err, n;
- struct kvp *t, *a, *p;
- int t_changed, ret;
- char *alias, **w;
-
- /* notice whether the tracks.db entry changes */
- t_changed = 0;
- /* get any existing tracks entry */
- if((err = gettrackdata(track, &t, &p, 0, 0, tid)) == DB_LOCK_DEADLOCK)
- return err;
- ret = err; /* 0 or DB_NOTFOUND */
- /* this is a real track */
- t_changed += kvp_set(&t, "_alias_for", 0);
- t_changed += kvp_set(&t, "_path", path);
- /* if we have an alias record it in the database */
- if((err = compute_alias(&alias, track, p, tid))) return err;
- if(alias) {
- /* won't overwrite someone else's alias as compute_alias() checks */
- D(("%s: alias %s", track, alias));
- a = 0;
- kvp_set(&a, "_alias_for", track);
- if((err = trackdb_putdata(trackdb_tracksdb, alias, a, tid, 0))) return err;
- }
- /* update search.db */
- w = track_to_words(track, p);
- for(n = 0; w[n]; ++n)
- if((err = register_search_word(track, w[n], tid)))
- return err;
- /* update tags.db */
- w = parsetags(kvp_get(p, "tags"));
- for(n = 0; w[n]; ++n)
- if((err = register_tag(track, w[n], tid)))
- return err;
- reqtracks = 0;
- /* only store the tracks.db entry if it has changed */
- if(t_changed && (err = trackdb_putdata(trackdb_tracksdb, track, t, tid, 0)))
- return err;
- if(ret == DB_NOTFOUND) {
- uint32_t timestamp[2];
- time_t now;
- DBT key, data;
-
- time(&now);
- timestamp[0] = htonl((uint64_t)now >> 32);
- timestamp[1] = htonl((uint32_t)now);
- memset(&key, 0, sizeof key);
- key.data = timestamp;
- key.size = sizeof timestamp;
- switch(err = trackdb_noticeddb->put(trackdb_noticeddb, tid, &key,
- make_key(&data, track), 0)) {
- case 0: break;
- case DB_LOCK_DEADLOCK: return err;
- default: fatal(0, "error updating noticed.db: %s", db_strerror(err));
- }
- }
- return ret;
-}
-
-/* trackdb_obsolete() ********************************************************/
-
-/* obsolete a track */
-int trackdb_obsolete(const char *track, DB_TXN *tid) {
- int err, n;
- struct kvp *p;
- char *alias, **w;
-
- if((err = gettrackdata(track, 0, &p, 0,
- GTD_NOALIAS, tid)) == DB_LOCK_DEADLOCK)
- return err;
- else if(err == DB_NOTFOUND) return 0;
- /* compute the alias, if any, and delete it */
- if(compute_alias(&alias, track, p, tid)) return err;
- if(alias) {
- /* if the alias points to some other track then compute_alias won't
- * return it */
- if(trackdb_delkey(trackdb_tracksdb, alias, tid))
- return err;
- }
- /* update search.db */
- w = track_to_words(track, p);
- for(n = 0; w[n]; ++n)
- if(trackdb_delkeydata(trackdb_searchdb,
- w[n], track, tid) == DB_LOCK_DEADLOCK)
- return err;
- /* update tags.db */
- w = parsetags(kvp_get(p, "tags"));
- for(n = 0; w[n]; ++n)
- if(trackdb_delkeydata(trackdb_tagsdb,
- w[n], track, tid) == DB_LOCK_DEADLOCK)
- return err;
- reqtracks = 0;
- /* update tracks.db */
- if(trackdb_delkey(trackdb_tracksdb, track, tid) == DB_LOCK_DEADLOCK)
- return err;
- /* We don't delete the prefs, so they survive temporary outages of the
- * (possibly virtual) track filesystem */
- return 0;
-}
-
-/* trackdb_stats() ***********************************************************/
-
-#define H(name) { #name, offsetof(DB_HASH_STAT, name) }
-#define B(name) { #name, offsetof(DB_BTREE_STAT, name) }
-
-static const struct statinfo {
- const char *name;
- size_t offset;
-} statinfo_hash[] = {
- H(hash_magic),
- H(hash_version),
- H(hash_nkeys),
- H(hash_ndata),
- H(hash_pagesize),
- H(hash_ffactor),
- H(hash_buckets),
- H(hash_free),
- H(hash_bfree),
- H(hash_bigpages),
- H(hash_big_bfree),
- H(hash_overflows),
- H(hash_ovfl_free),
- H(hash_dup),
- H(hash_dup_free),
-}, statinfo_btree[] = {
- B(bt_magic),
- B(bt_version),
- B(bt_nkeys),
- B(bt_ndata),
- B(bt_pagesize),
- B(bt_minkey),
- B(bt_re_len),
- B(bt_re_pad),
- B(bt_levels),
- B(bt_int_pg),
- B(bt_leaf_pg),
- B(bt_dup_pg),
- B(bt_over_pg),
- B(bt_free),
- B(bt_int_pgfree),
- B(bt_leaf_pgfree),
- B(bt_dup_pgfree),
- B(bt_over_pgfree),
-};
-
-/* look up stats for DB */
-static int get_stats(struct vector *v,
- DB *database,
- const struct statinfo *si,
- size_t nsi,
- DB_TXN *tid) {
- void *sp;
- size_t n;
- char *str;
- int err;
-
- if(database) {
- switch(err = database->stat(database, tid, &sp, 0)) {
- case 0:
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying database: %s", db_strerror(err));
- return err;
- default:
- fatal(0, "error querying database: %s", db_strerror(err));
- }
- for(n = 0; n < nsi; ++n) {
- byte_xasprintf(&str, "%s=%"PRIuMAX, si[n].name,
- (uintmax_t)*(u_int32_t *)((char *)sp + si[n].offset));
- vector_append(v, str);
- }
- }
- return 0;
-}
-
-/** @brief One entry in the search league */
-struct search_entry {
- char *word;
- int n;
-};
-
-/** @brief Add a word to the search league
- * @param se Pointer to search league
- * @param count Maximum size for search league
- * @param nse Current size of search league
- * @param word New word, or NULL
- * @param n How often @p word appears
- * @return New size of search league
- */
-static int register_search_entry(struct search_entry *se,
- int count,
- int nse,
- char *word,
- int n) {
- int i;
-
- if(word && (nse < count || n > se[nse - 1].n)) {
- /* Find the starting point */
- if(nse == count)
- i = nse - 1;
- else
- i = nse++;
- /* Find the insertion point */
- while(i > 0 && n > se[i - 1].n)
- --i;
- memmove(&se[i + 1], &se[i], (nse - i - 1) * sizeof *se);
- se[i].word = word;
- se[i].n = n;
- }
- return nse;
-}
-
-/* find the top COUNT words in the search database */
-static int search_league(struct vector *v, int count, DB_TXN *tid) {
- struct search_entry *se;
- DBT k, d;
- DBC *cursor;
- int err, n = 0, nse = 0, i;
- char *word = 0;
- size_t wl = 0;
- char *str;
-
- cursor = trackdb_opencursor(trackdb_searchdb, tid);
- se = xmalloc(count * sizeof *se);
- /* Walk across the whole database counting up the number of times each
- * word appears. */
- while(!(err = cursor->c_get(cursor, prepare_data(&k), prepare_data(&d),
- DB_NEXT))) {
- if(word && wl == k.size && !strncmp(word, k.data, wl))
- ++n; /* same word again */
- else {
- nse = register_search_entry(se, count, nse, word, n);
- word = xstrndup(k.data, wl = k.size);
- n = 1;
- }
- }
- switch(err) {
- case DB_NOTFOUND:
- err = 0;
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying search database: %s", db_strerror(err));
- break;
- default:
- fatal(0, "error querying search database: %s", db_strerror(err));
- }
- if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
- if(err) return err;
- nse = register_search_entry(se, count, nse, word, n);
- byte_xasprintf(&str, "Top %d search words:", nse);
- vector_append(v, str);
- for(i = 0; i < nse; ++i) {
- byte_xasprintf(&str, "%4d: %5d %s", i + 1, se[i].n, se[i].word);
- vector_append(v, str);
- }
- return 0;
-}
-
-#define SI(what) statinfo_##what, \
- sizeof statinfo_##what / sizeof (struct statinfo)
-
-/* return a list of database stats */
-char **trackdb_stats(int *nstatsp) {
- DB_TXN *tid;
- struct vector v;
-
- vector_init(&v);
- for(;;) {
- tid = trackdb_begin_transaction();
- v.nvec = 0;
- vector_append(&v, (char *)"Tracks database stats:");
- if(get_stats(&v, trackdb_tracksdb, SI(btree), tid)) goto fail;
- vector_append(&v, (char *)"");
- vector_append(&v, (char *)"Search database stats:");
- if(get_stats(&v, trackdb_searchdb, SI(hash), tid)) goto fail;
- vector_append(&v, (char *)"");
- vector_append(&v, (char *)"Prefs database stats:");
- if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail;
- vector_append(&v, (char *)"");
- if(search_league(&v, 10, tid)) goto fail;
- vector_terminate(&v);
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- if(nstatsp) *nstatsp = v.nvec;
- return v.vec;
-}
-
-struct stats_details {
- void (*done)(char *data, void *u);
- void *u;
- int exited; /* subprocess exited */
- int closed; /* pipe close */
- int wstat; /* wait status from subprocess */
- struct dynstr data[1]; /* data read from pipe */
-};
-
-static void stats_complete(struct stats_details *d) {
- char *s;
-
- if(!(d->exited && d->closed))
- return;
- byte_xasprintf(&s, "\n"
- "Server stats:\n"
- "track lookup cache hits: %lu\n"
- "track lookup cache misses: %lu\n",
- cache_files_hits,
- cache_files_misses);
- dynstr_append_string(d->data, s);
- dynstr_terminate(d->data);
- d->done(d->data->vec, d->u);
-}
-
-static int stats_finished(ev_source attribute((unused)) *ev,
- pid_t attribute((unused)) pid,
- int status,
- const struct rusage attribute((unused)) *rusage,
- void *u) {
- struct stats_details *const d = u;
-
- d->exited = 1;
- if(status)
- error(0, "disorder-stats %s", wstat(status));
- stats_complete(d);
- return 0;
-}
-
-static int stats_read(ev_source attribute((unused)) *ev,
- ev_reader *reader,
- void *ptr,
- size_t bytes,
- int eof,
- void *u) {
- struct stats_details *const d = u;
-
- dynstr_append_bytes(d->data, ptr, bytes);
- ev_reader_consume(reader, bytes);
- if(eof)
- d->closed = 1;
- stats_complete(d);
- return 0;
-}
-
-static int stats_error(ev_source attribute((unused)) *ev,
- int errno_value,
- void *u) {
- struct stats_details *const d = u;
-
- error(errno_value, "error reading from pipe to disorder-stats");
- d->closed = 1;
- stats_complete(d);
- return 0;
-}
-
-void trackdb_stats_subprocess(ev_source *ev,
- void (*done)(char *data, void *u),
- void *u) {
- int p[2];
- pid_t pid;
- struct stats_details *d = xmalloc(sizeof *d);
-
- dynstr_init(d->data);
- d->done = done;
- d->u = u;
- xpipe(p);
- pid = subprogram(ev, "disorder-stats", p[1]);
- xclose(p[1]);
- ev_child(ev, pid, 0, stats_finished, d);
- ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader");
-}
-
-/* set a pref (remove if value=0) */
-int trackdb_set(const char *track,
- const char *name,
- const char *value) {
- struct kvp *t, *p, *a;
- DB_TXN *tid;
- int err, cmp;
- char *oldalias, *newalias, **oldtags = 0, **newtags;
-
- if(value) {
- /* TODO: if value matches default then set value=0 */
- }
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if((err = gettrackdata(track, &t, &p, 0,
- 0, tid)) == DB_LOCK_DEADLOCK)
- goto fail;
- if(err == DB_NOTFOUND) break;
- if(name[0] == '_') {
- if(kvp_set(&t, name, value))
- if(trackdb_putdata(trackdb_tracksdb, track, t, tid, 0))
- goto fail;
- } else {
- /* get the old alias name */
- if(compute_alias(&oldalias, track, p, tid)) goto fail;
- /* get the old tags */
- if(!strcmp(name, "tags"))
- oldtags = parsetags(kvp_get(p, "tags"));
- /* set the value */
- if(kvp_set(&p, name, value))
- if(trackdb_putdata(trackdb_prefsdb, track, p, tid, 0))
- goto fail;
- /* compute the new alias name */
- if((err = compute_alias(&newalias, track, p, tid))) goto fail;
- /* check whether alias has changed */
- if(!(oldalias == newalias
- || (oldalias && newalias && !strcmp(oldalias, newalias)))) {
- /* adjust alias records to fit change */
- if(oldalias
- && trackdb_delkey(trackdb_tracksdb, oldalias, tid)) goto fail;
- if(newalias) {
- a = 0;
- kvp_set(&a, "_alias_for", track);
- if(trackdb_putdata(trackdb_tracksdb, newalias, a, tid, 0)) goto fail;
- }
- }
- /* check whether tags have changed */
- if(!strcmp(name, "tags")) {
- newtags = parsetags(value);
- while(*oldtags || *newtags) {
- if(*oldtags && *newtags) {
- cmp = strcmp(*oldtags, *newtags);
- if(!cmp) {
- /* keeping this tag */
- ++oldtags;
- ++newtags;
- } else if(cmp < 0)
- /* old tag fits into a gap in the new list, so delete old */
- goto delete_old;
- else
- /* new tag fits into a gap in the old list, so insert new */
- goto insert_new;
- } else if(*oldtags) {
- /* we've run out of new tags, so remaining old ones are to be
- * deleted */
- delete_old:
- if(trackdb_delkeydata(trackdb_tagsdb,
- *oldtags, track, tid) == DB_LOCK_DEADLOCK)
- goto fail;
- ++oldtags;
- } else {
- /* we've run out of old tags, so remainig new ones are to be
- * inserted */
- insert_new:
- if(register_tag(track, *newtags, tid)) goto fail;
- ++newtags;
- }
- }
- reqtracks = 0;
- }
- }
- err = 0;
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return err == 0 ? 0 : -1;
-}
-
-/* get a pref */
-const char *trackdb_get(const char *track,
- const char *name) {
- return kvp_get(trackdb_get_all(track), name);
-}
-
-/* get all prefs as a 0-terminated array */
-struct kvp *trackdb_get_all(const char *track) {
- struct kvp *t, *p, **pp;
- DB_TXN *tid;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
- goto fail;
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- for(pp = &p; *pp; pp = &(*pp)->next)
- ;
- *pp = t;
- return p;
-}
-
-/* resolve alias */
-const char *trackdb_resolve(const char *track) {
- DB_TXN *tid;
- const char *actual;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if(gettrackdata(track, 0, 0, &actual, 0, tid) == DB_LOCK_DEADLOCK)
- goto fail;
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return actual;
-}
-
-int trackdb_isalias(const char *track) {
- const char *actual = trackdb_resolve(track);
-
- return strcmp(actual, track);
-}
-
-/* test whether a track exists (perhaps an alias) */
-int trackdb_exists(const char *track) {
- DB_TXN *tid;
- int err;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- /* unusually, here we want the return value */
- if((err = gettrackdata(track, 0, 0, 0, 0, tid)) == DB_LOCK_DEADLOCK)
- goto fail;
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return (err == 0);
-}
-
-/* return the list of tags */
-char **trackdb_alltags(void) {
- DB_TXN *tid;
- int err;
- char **taglist;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- err = trackdb_alltags_tid(tid, &taglist);
- if(!err) break;
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return taglist;
-}
-
-static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp) {
- struct vector v;
- DBC *c;
- DBT k, d;
- int err;
-
- vector_init(&v);
- c = trackdb_opencursor(trackdb_tagsdb, tid);
- memset(&k, 0, sizeof k);
- while(!(err = c->c_get(c, &k, prepare_data(&d), DB_NEXT_NODUP)))
- vector_append(&v, xstrndup(k.data, k.size));
- switch(err) {
- case DB_NOTFOUND:
- break;
- case DB_LOCK_DEADLOCK:
- return err;
- default:
- fatal(0, "c->c_get: %s", db_strerror(err));
- }
- if((err = trackdb_closecursor(c))) return err;
- vector_terminate(&v);
- *taglistp = v.vec;
- return 0;
-}
-
-/* return 1 iff sorted tag lists A and B have at least one member in common */
-static int tag_intersection(char **a, char **b) {
- int cmp;
-
- /* Same sort of logic as trackdb_set() above */
- while(*a && *b) {
- if(!(cmp = strcmp(*a, *b))) return 1;
- else if(cmp < 0) ++a;
- else ++b;
- }
- return 0;
-}
-
-/* Check whether a track is suitable for random play. Returns 0 if it is,
- * DB_NOTFOUND if it is not or DB_LOCK_DEADLOCK if the database gave us
- * that. */
-static int check_suitable(const char *track,
- DB_TXN *tid,
- char **required_tags,
- char **prohibited_tags) {
- char **track_tags;
- time_t last, now;
- struct kvp *p, *t;
- const char *pick_at_random, *played_time;
-
- /* don't pick tracks that aren't in any surviving collection (for instance
- * you've edited the config but the rescan hasn't done its job yet) */
- if(!find_track_root(track)) {
- info("found track not in any collection: %s", track);
- return DB_NOTFOUND;
- }
- /* don't pick aliases - only pick the canonical form */
- if(gettrackdata(track, &t, &p, 0, 0, tid) == DB_LOCK_DEADLOCK)
- return DB_LOCK_DEADLOCK;
- if(kvp_get(t, "_alias_for"))
- return DB_NOTFOUND;
- /* check that random play is not suppressed for this track */
- if((pick_at_random = kvp_get(p, "pick_at_random"))
- && !strcmp(pick_at_random, "0"))
- return DB_NOTFOUND;
- /* don't pick a track that's been played in the last 8 hours */
- if((played_time = kvp_get(p, "played_time"))) {
- last = atoll(played_time);
- now = time(0);
- if(now < last + 8 * 3600) /* TODO configurable */
- return DB_NOTFOUND;
- }
- track_tags = parsetags(kvp_get(p, "tags"));
- /* check that no prohibited tag is present for this track */
- if(prohibited_tags && tag_intersection(track_tags, prohibited_tags))
- return DB_NOTFOUND;
- /* check that at least one required tags is present for this track */
- if(*required_tags && !tag_intersection(track_tags, required_tags))
- return DB_NOTFOUND;
- return 0;
-}
-
-/* attempt to pick a random non-alias track */
-const char *trackdb_random(int tries) {
- DBT key, data;
- DB_BTREE_STAT *sp;
- int err, n;
- DB_TXN *tid;
- const char *track, *candidate;
- db_recno_t r;
- const char *tags;
- char **required_tags, **prohibited_tags, **tp;
- hash *h;
- DBC *c = 0;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if((err = trackdb_get_global_tid("required-tags", tid, &tags)))
- goto fail;
- required_tags = parsetags(tags);
- if((err = trackdb_get_global_tid("prohibited-tags", tid, &tags)))
- goto fail;
- prohibited_tags = parsetags(tags);
- track = 0;
- if(*required_tags) {
- /* Bung all the suitable tracks into a hash and convert to a list of keys
- * (to eliminate duplicates). We cache this list since it is possible
- * that it will be very large. */
- if(!reqtracks) {
- h = hash_new(0);
- for(tp = required_tags; *tp; ++tp) {
- c = trackdb_opencursor(trackdb_tagsdb, tid);
- memset(&key, 0, sizeof key);
- key.data = *tp;
- key.size = strlen(*tp);
- n = 0;
- err = c->c_get(c, &key, prepare_data(&data), DB_SET);
- while(err == 0) {
- hash_add(h, xstrndup(data.data, data.size), 0,
- HASH_INSERT_OR_REPLACE);
- ++n;
- err = c->c_get(c, &key, prepare_data(&data), DB_NEXT_DUP);
- }
- switch(err) {
- case 0:
- case DB_NOTFOUND:
- break;
- case DB_LOCK_DEADLOCK:
- goto fail;
- default:
- fatal(0, "error querying tags.db: %s", db_strerror(err));
- }
- trackdb_closecursor(c);
- c = 0;
- if(!n)
- error(0, "required tag %s does not match any tracks", *tp);
- }
- nreqtracks = hash_count(h);
- reqtracks = hash_keys(h);
- }
- while(nreqtracks && !track && tries-- > 0) {
- r = (rand() * (double)nreqtracks / (RAND_MAX + 1.0));
- candidate = reqtracks[r];
- switch(check_suitable(candidate, tid,
- required_tags, prohibited_tags)) {
- case 0:
- track = candidate;
- break;
- case DB_NOTFOUND:
- break;
- case DB_LOCK_DEADLOCK:
- goto fail;
- }
- }
- } else {
- /* No required tags. We pick random record numbers in the database
- * instead. */
- switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) {
- case 0:
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying tracks.db: %s", db_strerror(err));
- goto fail;
- default:
- fatal(0, "error querying tracks.db: %s", db_strerror(err));
- }
- if(!sp->bt_nkeys)
- error(0, "cannot pick tracks at random from an empty database");
- while(sp->bt_nkeys && !track && tries-- > 0) {
- /* record numbers count from 1 upwards */
- r = 1 + (rand() * (double)sp->bt_nkeys / (RAND_MAX + 1.0));
- memset(&key, sizeof key, 0);
- key.flags = DB_DBT_MALLOC;
- key.size = sizeof r;
- key.data = &r;
- switch(err = trackdb_tracksdb->get(trackdb_tracksdb, tid, &key, prepare_data(&data),
- DB_SET_RECNO)) {
- case 0:
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying tracks.db: %s", db_strerror(err));
- goto fail;
- default:
- fatal(0, "error querying tracks.db: %s", db_strerror(err));
- }
- candidate = xstrndup(key.data, key.size);
- switch(check_suitable(candidate, tid,
- required_tags, prohibited_tags)) {
- case 0:
- track = candidate;
- break;
- case DB_NOTFOUND:
- break;
- case DB_LOCK_DEADLOCK:
- goto fail;
- }
- }
- }
- break;
-fail:
- trackdb_closecursor(c);
- c = 0;
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- if(!track)
- error(0, "could not pick a random track");
- return track;
-}
-
-/* get a track name given the prefs. Set *used_db to 1 if we got the answer
- * from the prefs. */
-static const char *getpart(const char *track,
- const char *context,
- const char *part,
- const struct kvp *p,
- int *used_db) {
- const char *result;
- char *pref;
-
- byte_xasprintf(&pref, "trackname_%s_%s", context, part);
- if((result = kvp_get(p, pref)))
- *used_db = 1;
- else
- result = trackname_part(track, context, part);
- assert(result != 0);
- return result;
-}
-
-/* get a track name part, like trackname_part(), but taking the database into
- * account. */
-const char *trackdb_getpart(const char *track,
- const char *context,
- const char *part) {
- struct kvp *p;
- DB_TXN *tid;
- char *pref;
- const char *actual;
- int used_db, err;
-
- /* construct the full pref */
- byte_xasprintf(&pref, "trackname_%s_%s", context, part);
- for(;;) {
- tid = trackdb_begin_transaction();
- if((err = gettrackdata(track, 0, &p, &actual, 0, tid)) == DB_LOCK_DEADLOCK)
- goto fail;
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return getpart(actual, context, part, p, &used_db);
-}
-
-/* get the raw path name for @track@ (might be an alias) */
-const char *trackdb_rawpath(const char *track) {
- DB_TXN *tid;
- struct kvp *t;
- const char *path;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if(gettrackdata(track, &t, 0, 0, 0, tid) == DB_LOCK_DEADLOCK)
- goto fail;
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- if(!(path = kvp_get(t, "_path"))) path = track;
- return path;
-}
-
-/* trackdb_list **************************************************************/
-
-/* this is incredibly ugly, sorry, perhaps it will be rewritten to be actually
- * readable at some point */
-
-/* return true if the basename of TRACK[0..TL-1], as defined by DL, matches RE.
- * If RE is a null pointer then it matches everything. */
-static int track_matches(size_t dl, const char *track, size_t tl,
- const pcre *re) {
- int ovec[3], rc;
-
- if(!re)
- return 1;
- track += dl + 1;
- tl -= (dl + 1);
- switch(rc = pcre_exec(re, 0, track, tl, 0, 0, ovec, 3)) {
- case PCRE_ERROR_NOMATCH: return 0;
- default:
- if(rc < 0) {
- error(0, "pcre_exec returned %d, subject '%s'", rc, track);
- return 0;
- }
- return 1;
- }
-}
-
-static int do_list(struct vector *v, const char *dir,
- enum trackdb_listable what, const pcre *re, DB_TXN *tid) {
- DBC *cursor;
- DBT k, d;
- size_t dl;
- char *ptr;
- int err;
- size_t l, last_dir_len = 0;
- char *last_dir = 0, *track, *alias;
- struct kvp *p;
-
- dl = strlen(dir);
- cursor = trackdb_opencursor(trackdb_tracksdb, tid);
- make_key(&k, dir);
- prepare_data(&d);
- /* find the first key >= dir */
- err = cursor->c_get(cursor, &k, &d, DB_SET_RANGE);
- /* keep going while we're dealing with <dir/anything> */
- while(err == 0
- && k.size > dl
- && ((char *)k.data)[dl] == '/'
- && !memcmp(k.data, dir, dl)) {
- ptr = memchr((char *)k.data + dl + 1, '/', k.size - (dl + 1));
- if(ptr) {
- /* we have <dir/component/anything>, so <dir/component> is a directory */
- l = ptr - (char *)k.data;
- if(what & trackdb_directories)
- if(!(last_dir
- && l == last_dir_len
- && !memcmp(last_dir, k.data, l))) {
- last_dir = xstrndup(k.data, last_dir_len = l);
- if(track_matches(dl, k.data, l, re))
- vector_append(v, last_dir);
- }
- } else {
- /* found a plain file */
- if((what & trackdb_files)) {
- track = xstrndup(k.data, k.size);
- if((err = trackdb_getdata(trackdb_prefsdb,
- track, &p, tid)) == DB_LOCK_DEADLOCK)
- goto deadlocked;
- /* if this file has an alias in the same directory then we skip it */
- if((err = compute_alias(&alias, track, p, tid)))
- goto deadlocked;
- if(!(alias && !strcmp(d_dirname(alias), d_dirname(track))))
- if(track_matches(dl, k.data, k.size, re))
- vector_append(v, track);
- }
- }
- err = cursor->c_get(cursor, &k, &d, DB_NEXT);
- }
- switch(err) {
- case 0:
- break;
- case DB_NOTFOUND:
- err = 0;
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying database: %s", db_strerror(err));
- break;
- default:
- fatal(0, "error querying database: %s", db_strerror(err));
- }
-deadlocked:
- if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
- return err;
-}
-
-/* return the directories or files below @dir@ */
-char **trackdb_list(const char *dir, int *np, enum trackdb_listable what,
- const pcre *re) {
- DB_TXN *tid;
- int n;
- struct vector v;
-
- vector_init(&v);
- for(;;) {
- tid = trackdb_begin_transaction();
- v.nvec = 0;
- if(dir) {
- if(do_list(&v, dir, what, re, tid))
- goto fail;
- } else {
- for(n = 0; n < config->collection.n; ++n)
- if(do_list(&v, config->collection.s[n].root, what, re, tid))
- goto fail;
- }
- break;
-fail:
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- vector_terminate(&v);
- if(np)
- *np = v.nvec;
- return v.vec;
-}
-
-/* If S is tag:something, return something. Else return 0. */
-static const char *checktag(const char *s) {
- if(!strncmp(s, "tag:", 4))
- return s + 4;
- else
- return 0;
-}
-
-/* return a list of tracks containing all of the words given. If you
- * ask for only stopwords you get no tracks. */
-char **trackdb_search(char **wordlist, int nwordlist, int *ntracks) {
- const char **w, *best = 0, *tag;
- char **twords, **tags;
- char *istag;
- int i, j, n, err, what;
- DBC *cursor = 0;
- DBT k, d;
- struct vector u, v;
- DB_TXN *tid;
- struct kvp *p;
- int ntags = 0;
- DB *db;
- const char *dbname;
-
- *ntracks = 0; /* for early returns */
- /* normalize all the words */
- w = xmalloc(nwordlist * sizeof (char *));
- istag = xmalloc_noptr(nwordlist);
- for(n = 0; n < nwordlist; ++n) {
- uint32_t *w32;
- size_t nw32;
-
- w[n] = utf8_casefold_compat(wordlist[n], strlen(wordlist[n]), 0);
- if(checktag(w[n])) {
- ++ntags; /* count up tags */
- /* Normalize the tag */
- w[n] = normalize_tag(w[n] + 4, strlen(w[n] + 4));
- istag[n] = 1;
- } else {
- /* Normalize the search term by removing combining characters */
- if(!(w32 = utf8_to_utf32(w[n], strlen(w[n]), &nw32)))
- return 0;
- nw32 = remove_combining_chars(w32, nw32);
- if(!(w[n] = utf32_to_utf8(w32, nw32, 0)))
- return 0;
- istag[n] = 0;
- }
- }
- /* find the longest non-stopword */
- for(n = 0; n < nwordlist; ++n)
- if(!istag[n] && !stopword(w[n]))
- if(!best || strlen(w[n]) > strlen(best))
- best = w[n];
- /* TODO: we should at least in principal be able to identify the word or tag
- * with the least matches in log time, and choose that as our primary search
- * term. */
- if(ntags && !best) {
- /* Only tags are listed. We limit to the first and narrow down with the
- * rest. */
- best = istag[0] ? w[0] : 0;
- db = trackdb_tagsdb;
- dbname = "tags";
- } else if(best) {
- /* We can limit to some word. */
- db = trackdb_searchdb;
- dbname = "search";
- } else {
- /* Only stopwords */
- return 0;
- }
- vector_init(&u);
- vector_init(&v);
- for(;;) {
- tid = trackdb_begin_transaction();
- /* find all the tracks that have that word */
- make_key(&k, best);
- prepare_data(&d);
- what = DB_SET;
- v.nvec = 0;
- cursor = trackdb_opencursor(db, tid);
- while(!(err = cursor->c_get(cursor, &k, &d, what))) {
- vector_append(&v, xstrndup(d.data, d.size));
- what = DB_NEXT_DUP;
- }
- switch(err) {
- case DB_NOTFOUND:
- err = 0;
- break;
- case DB_LOCK_DEADLOCK:
- error(0, "error querying %s database: %s", dbname, db_strerror(err));
- break;
- default:
- fatal(0, "error querying %s database: %s", dbname, db_strerror(err));
- }
- if(trackdb_closecursor(cursor)) err = DB_LOCK_DEADLOCK;
- cursor = 0;
- /* do a naive search over that (hopefuly fairly small) list of tracks */
- u.nvec = 0;
- for(n = 0; n < v.nvec; ++n) {
- if((err = gettrackdata(v.vec[n], 0, &p, 0, 0, tid) == DB_LOCK_DEADLOCK))
- goto fail;
- else if(err) {
- error(0, "track %s unexpected error: %s", v.vec[n], db_strerror(err));
- continue;
- }
- twords = track_to_words(v.vec[n], p);
- tags = parsetags(kvp_get(p, "tags"));
- for(i = 0; i < nwordlist; ++i) {
- if(istag[i]) {
- tag = w[i];
- /* Track must have this tag */
- for(j = 0; tags[j]; ++j)
- if(!strcmp(tag, tags[j])) break; /* tag found */
- if(!tags[j]) break; /* tag not found */
- } else {
- /* Track must contain this word */
- for(j = 0; twords[j]; ++j)
- if(!strcmp(w[i], twords[j])) break; /* word found */
- if(!twords[j]) break; /* word not found */
- }
- }
- if(i >= nwordlist) /* all words found */
- vector_append(&u, v.vec[n]);
- }
- break;
- fail:
- trackdb_closecursor(cursor);
- cursor = 0;
- trackdb_abort_transaction(tid);
- info("retrying search");
- }
- trackdb_commit_transaction(tid);
- vector_terminate(&u);
- if(ntracks)
- *ntracks = u.nvec;
- return u.vec;
-}
-
-/* trackdb_scan **************************************************************/
-
-int trackdb_scan(const char *root,
- int (*callback)(const char *track,
- struct kvp *data,
- void *u,
- DB_TXN *tid),
- void *u,
- DB_TXN *tid) {
- DBC *cursor;
- DBT k, d;
- const size_t root_len = root ? strlen(root) : 0;
- int err, cberr;
- struct kvp *data;
- const char *track;
-
- cursor = trackdb_opencursor(trackdb_tracksdb, tid);
- if(root)
- err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d),
- DB_SET_RANGE);
- else {
- memset(&k, 0, sizeof k);
- err = cursor->c_get(cursor, &k, prepare_data(&d),
- DB_FIRST);
- }
- while(!err) {
- if(!root
- || (k.size > root_len
- && !strncmp(k.data, root, root_len)
- && ((char *)k.data)[root_len] == '/')) {
- data = kvp_urldecode(d.data, d.size);
- if(kvp_get(data, "_path")) {
- track = xstrndup(k.data, k.size);
- /* Advance to the next track before the callback so that the callback
- * may safely delete the track */
- err = cursor->c_get(cursor, &k, &d, DB_NEXT);
- if((cberr = callback(track, data, u, tid))) {
- err = cberr;
- break;
- }
- } else
- err = cursor->c_get(cursor, &k, &d, DB_NEXT);
- } else
- break;
- }
- trackdb_closecursor(cursor);
- switch(err) {
- case EINTR:
- return err;
- case 0:
- case DB_NOTFOUND:
- return 0;
- case DB_LOCK_DEADLOCK:
- error(0, "c->c_get: %s", db_strerror(err));
- return err;
- default:
- fatal(0, "c->c_get: %s", db_strerror(err));
- }
-}
-
-/* trackdb_rescan ************************************************************/
-
-/* called when the rescanner terminates */
-static int reap_rescan(ev_source attribute((unused)) *ev,
- pid_t pid,
- int status,
- const struct rusage attribute((unused)) *rusage,
- void attribute((unused)) *u) {
- if(pid == rescan_pid) rescan_pid = -1;
- if(status)
- error(0, RESCAN": %s", wstat(status));
- else
- D((RESCAN" terminated: %s", wstat(status)));
- /* Our cache of file lookups is out of date now */
- cache_clean(&cache_files_type);
- eventlog("rescanned", (char *)0);
- return 0;
-}
-
-void trackdb_rescan(ev_source *ev) {
- int w;
-
- if(rescan_pid != -1) {
- error(0, "rescan already underway");
- return;
- }
- rescan_pid = subprogram(ev, RESCAN, -1);
- if(ev) {
- ev_child(ev, rescan_pid, 0, reap_rescan, 0);
- D(("started rescanner"));
- } else {
- /* This is the first rescan, we block until it is complete */
- while(waitpid(rescan_pid, &w, 0) < 0 && errno == EINTR)
- ;
- reap_rescan(0, rescan_pid, w, 0, 0);
- }
-}
-
-int trackdb_rescan_cancel(void) {
- if(rescan_pid == -1) return 0;
- if(kill(rescan_pid, SIGTERM) < 0)
- fatal(errno, "error killing rescanner");
- rescan_pid = -1;
- return 1;
-}
-
-/* global prefs **************************************************************/
-
-void trackdb_set_global(const char *name,
- const char *value,
- const char *who) {
- DB_TXN *tid;
- int err;
- int state;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if(!(err = trackdb_set_global_tid(name, value, tid)))
- break;
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- /* log important state changes */
- if(!strcmp(name, "playing")) {
- state = !value || !strcmp(value, "yes");
- info("playing %s by %s",
- state ? "enabled" : "disabled",
- who ? who : "-");
- eventlog("state", state ? "enable_play" : "disable_play", (char *)0);
- }
- if(!strcmp(name, "random-play")) {
- state = !value || !strcmp(value, "yes");
- info("random play %s by %s",
- state ? "enabled" : "disabled",
- who ? who : "-");
- eventlog("state", state ? "enable_random" : "disable_random", (char *)0);
- }
- if(!strcmp(name, "required-tags"))
- reqtracks = 0;
-}
-
-int trackdb_set_global_tid(const char *name,
- const char *value,
- DB_TXN *tid) {
- DBT k, d;
- int err;
-
- memset(&k, 0, sizeof k);
- memset(&d, 0, sizeof d);
- k.data = (void *)name;
- k.size = strlen(name);
- if(value) {
- d.data = (void *)value;
- d.size = strlen(value);
- }
- if(value)
- err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0);
- else
- err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0);
- if(err == DB_LOCK_DEADLOCK) return err;
- if(err)
- fatal(0, "error updating database: %s", db_strerror(err));
- return 0;
-}
-
-const char *trackdb_get_global(const char *name) {
- DB_TXN *tid;
- int err;
- const char *r;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if(!(err = trackdb_get_global_tid(name, tid, &r)))
- break;
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return r;
-}
-
-int trackdb_get_global_tid(const char *name,
- DB_TXN *tid,
- const char **rp) {
- DBT k, d;
- int err;
-
- memset(&k, 0, sizeof k);
- k.data = (void *)name;
- k.size = strlen(name);
- switch(err = trackdb_globaldb->get(trackdb_globaldb, tid, &k,
- prepare_data(&d), 0)) {
- case 0:
- *rp = xstrndup(d.data, d.size);
- return 0;
- case DB_NOTFOUND:
- *rp = 0;
- return 0;
- case DB_LOCK_DEADLOCK:
- return err;
- default:
- fatal(0, "error reading database: %s", db_strerror(err));
- }
-}
-
-/** @brief Retrieve the most recently added tracks
- * @param ntracksp Where to put count, or 0
- * @param maxtracks Maximum number of tracks to retrieve
- * @return null-terminated array of track names
- *
- * The most recently added track is first in the array.
- */
-char **trackdb_new(int *ntracksp,
- int maxtracks) {
- DB_TXN *tid;
- char **tracks;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- tracks = trackdb_new_tid(ntracksp, maxtracks, tid);
- if(tracks)
- break;
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
- return tracks;
-}
-
-/** @brief Retrieve the most recently added tracks
- * @param ntracksp Where to put count, or 0
- * @param maxtracks Maximum number of tracks to retrieve, or 0 for all
- * @param tid Transaction ID
- * @return null-terminated array of track names, or NULL on deadlock
- *
- * The most recently added track is first in the array.
- */
-static char **trackdb_new_tid(int *ntracksp,
- int maxtracks,
- DB_TXN *tid) {
- DBC *c;
- DBT k, d;
- int err = 0;
- struct vector tracks[1];
-
- vector_init(tracks);
- c = trackdb_opencursor(trackdb_noticeddb, tid);
- while((maxtracks <= 0 || tracks->nvec < maxtracks)
- && !(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_PREV)))
- vector_append(tracks, xstrndup(d.data, d.size));
- switch(err) {
- case 0: /* hit maxtracks */
- case DB_NOTFOUND: /* ran out of tracks */
- break;
- case DB_LOCK_DEADLOCK:
- trackdb_closecursor(c);
- return 0;
- default:
- fatal(0, "error reading noticed.db: %s", db_strerror(err));
- }
- if((err = trackdb_closecursor(c)))
- return 0; /* deadlock */
- vector_terminate(tracks);
- if(ntracksp)
- *ntracksp = tracks->nvec;
- return tracks->vec;
-}
-
-/** @brief Expire noticed.db
- * @param earliest Earliest timestamp to keep
- */
-void trackdb_expire_noticed(time_t earliest) {
- DB_TXN *tid;
-
- for(;;) {
- tid = trackdb_begin_transaction();
- if(!trackdb_expire_noticed_tid(earliest, tid))
- break;
- trackdb_abort_transaction(tid);
- }
- trackdb_commit_transaction(tid);
-}
-
-/** @brief Expire noticed.db
- * @param earliest Earliest timestamp to keep
- * @param tid Transaction ID
- * @return 0 or DB_LOCK_DEADLOCK
- */
-static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid) {
- DBC *c;
- DBT k, d;
- int err = 0, ret;
- time_t when;
- uint32_t *kk;
- int count = 0;
-
- c = trackdb_opencursor(trackdb_noticeddb, tid);
- while(!(err = c->c_get(c, prepare_data(&k), prepare_data(&d), DB_NEXT))) {
- kk = k.data;
- when = (time_t)(((uint64_t)ntohl(kk[0]) << 32) + ntohl(kk[1]));
- if(when >= earliest)
- break;
- if((err = c->c_del(c, 0))) {
- if(err != DB_LOCK_DEADLOCK)
- fatal(0, "error deleting expired noticed.db entry: %s",
- db_strerror(err));
- break;
- }
- ++count;
- }
- if(err == DB_NOTFOUND)
- err = 0;
- if(err && err != DB_LOCK_DEADLOCK)
- fatal(0, "error expiring noticed.db: %s", db_strerror(err));
- ret = err;
- if((err = trackdb_closecursor(c))) {
- if(err != DB_LOCK_DEADLOCK)
- fatal(0, "error closing cursor: %s", db_strerror(err));
- ret = err;
- }
- if(!ret && count)
- info("expired %d tracks from noticed.db", count);
- return ret;
-}
-
-/* tidying up ****************************************************************/
-
-void trackdb_gc(void) {
- int err;
- char **logfiles;
-
- if((err = trackdb_env->txn_checkpoint(trackdb_env,
- config->checkpoint_kbyte,
- config->checkpoint_min,
- 0)))
- fatal(0, "trackdb_env->txn_checkpoint: %s", db_strerror(err));
- if((err = trackdb_env->log_archive(trackdb_env, &logfiles, DB_ARCH_REMOVE)))
- fatal(0, "trackdb_env->log_archive: %s", db_strerror(err));
- /* This makes catastrophic recovery impossible. However, the user can still
- * preserve the important data by using disorder-dump to snapshot their
- * prefs, and later to restore it. This is likely to have much small
- * long-term storage requirements than record the db logfiles. */
-}
-
-/*
-Local Variables:
-c-basic-offset:2
-comment-column:40
-fill-column:79
-indent-tabs-mode:nil
-End:
-*/
~mdw / disorder / blobdiff