/*
* This file is part of DisOrder
- * Copyright (C) 2005, 2006 Richard Kettlewell
+ * 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
* 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 <sys/time.h>
#include <sys/resource.h>
#include <time.h>
+#include <arpa/inet.h>
+#include <sys/wait.h>
#include "event.h"
#include "mem.h"
#include "configuration.h"
#include "syscalls.h"
#include "wstat.h"
-#include "words.h"
#include "printf.h"
#include "filepart.h"
#include "trackname.h"
#include "cache.h"
#include "eventlog.h"
#include "hash.h"
+#include "unicode.h"
+#include "unidata.h"
#define RESCAN "disorder-rescan"
#define DEADLOCK "disorder-deadlock"
const struct kvp *p,
int *used_db);
static int trackdb_alltags_tid(DB_TXN *tid, char ***taglistp);
-static int trackdb_get_global_tid(const char *name,
- DB_TXN *tid,
- const char **rp);
+static char **trackdb_new_tid(int *ntracksp,
+ int maxtracks,
+ DB_TXN *tid);
+static int trackdb_expire_noticed_tid(time_t earliest, DB_TXN *tid);
const struct cache_type cache_files_type = { 86400 };
unsigned long cache_files_hits, cache_files_misses;
static const char *home; /* home had better not change */
DB_ENV *trackdb_env; /* db environment */
-DB *trackdb_tracksdb; /* the db itself */
-DB *trackdb_prefsdb; /* preferences */
-DB *trackdb_searchdb; /* the search database */
+
+/** @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 */
static pid_t db_deadlock_pid = -1; /* deadlock manager PID */
static pid_t rescan_pid = -1; /* rescanner PID */
static int initialized, opened; /* state */
return compare_path_raw(a->data, a->size, b->data, b->size);
}
-/* open environment */
-void trackdb_init(int recover) {
+/** @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
+ */
+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 */
|DB_CREATE
|recover_type[recover],
0666)))
- fatal(0, "trackdb_env->open: %s", db_strerror(err));
+ 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);
return 0;
}
-static pid_t subprogram(ev_source *ev, const char *prog) {
+static pid_t subprogram(ev_source *ev, const char *prog,
+ int outputfd) {
pid_t pid;
- int lfd;
/* If we're in the background then trap subprocess stdout/stderr */
- if(!isatty(2))
- lfd = logfd(ev, prog);
- else
- lfd = -1;
if(!(pid = xfork())) {
exitfn = _exit;
- ev_signal_atfork(ev);
+ if(ev)
+ ev_signal_atfork(ev);
signal(SIGPIPE, SIG_DFL);
- if(lfd != -1) {
- xdup2(lfd, 1);
- xdup2(lfd, 2);
+ 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);
}
- if(lfd != -1) xclose(lfd);
return pid;
}
/* start deadlock manager */
void trackdb_master(ev_source *ev) {
assert(db_deadlock_pid == -1);
- db_deadlock_pid = subprogram(ev, DEADLOCK);
+ db_deadlock_pid = subprogram(ev, DEADLOCK, -1);
ev_child(ev, db_deadlock_pid, 0, reap_db_deadlock, 0);
D(("started deadlock manager"));
}
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)))
- fatal(0, "db->open %s: %s", path, db_strerror(err));
+ 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;
}
-/* open track databases */
-void trackdb_open(void) {
+/** @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 newdb, 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");
+ }
+ newdb = 0;
+ } 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 */
+ newdb = 1;
+ }
/* open the databases */
trackdb_tracksdb = open_db("tracks.db",
DB_RECNUM, DB_BTREE, DB_CREATE, 0666);
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);
+ if(newdb) {
+ /* 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"));
}
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));
trackdb_tracksdb = trackdb_searchdb = trackdb_prefsdb = 0;
trackdb_tagsdb = trackdb_globaldb = 0;
D(("closed databases"));
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 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;
+ /* 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));
+}
+
/* compute the words of a track name */
static char **track_to_words(const char *track,
const struct kvp *p) {
struct vector v;
- char **w;
- int nw;
+ const char *rootless = track_rootless(track);
+ if(!rootless)
+ rootless = track; /* bodge */
vector_init(&v);
- if((w = words(casefold(strip_extension(track_rootless(track))), &nw)))
- vector_append_many(&v, w, nw);
-
+ 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))
- if((w = words(casefold(p->value), &nw)))
- vector_append_many(&v, w, nw);
+ word_split(&v, p->value, 0);
vector_terminate(&v);
return dedupe(v.vec, v.nvec);
}
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(strstr(track, "Troggs"))
- D(("computing alias for %s", track));
+ if(!root) {
+ /* Bodge for tracks with no root */
+ *aliasp = 0;
+ return 0;
+ }
dynstr_init(&d);
- dynstr_append_string(&d, find_track_root(track));
+ dynstr_append_string(&d, root);
while((c = (unsigned char)*s++)) {
if(c != '{') {
dynstr_append(&d, c);
* an alias) */
switch(err = trackdb_getdata(trackdb_tracksdb, d.vec, &at, tid)) {
case 0:
- if(strstr(track, "Troggs"))
- D(("found a hit for alias"));
if((s = kvp_get(at, "_alias_for"))
&& !strcmp(s, track)) {
case DB_NOTFOUND:
- if(strstr(track, "Troggs"))
- D(("accepting anyway"));
*aliasp = d.vec;
} else {
- if(strstr(track, "Troggs")) {
- D(("rejecting"));
- D(("%s", track));
- D(("%s", s ? s : "(null)"));
- }
*aliasp = 0;
}
return 0;
/* trackdb_notice() **********************************************************/
-/* notice a track */
+/** @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;
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) {
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;
+ 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);
/* 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;
}
char **trackdb_stats(int *nstatsp) {
DB_TXN *tid;
struct vector v;
- char *s;
vector_init(&v);
for(;;) {
if(get_stats(&v, trackdb_prefsdb, SI(hash), tid)) goto fail;
vector_append(&v, (char *)"");
if(search_league(&v, 10, tid)) goto fail;
- vector_append(&v, (char *)"");
- vector_append(&v, (char *)"Server stats:");
- byte_xasprintf(&s, "track lookup cache hits: %lu", cache_files_hits);
- vector_append(&v, (char *)s);
- byte_xasprintf(&s, "track lookup cache misses: %lu", cache_files_misses);
- vector_append(&v, (char *)s);
vector_terminate(&v);
break;
fail:
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,
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,
}
/* Check whether a track is suitable for random play. Returns 0 if it is,
- * DB_NOTFOUND if it or DB_LOCK_DEADLOCK. */
+ * 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,
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;
} else {
/* No required tags. We pick random record numbers in the database
* instead. */
- switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp,
- DB_RECORDCOUNT)) {
+ switch(err = trackdb_tracksdb->stat(trackdb_tracksdb, tid, &sp, 0)) {
case 0:
break;
case DB_LOCK_DEADLOCK:
/* casefold all the words */
w = xmalloc(nwordlist * sizeof (char *));
for(n = 0; n < nwordlist; ++n) {
- w[n] = casefold(wordlist[n]);
+ w[n] = utf8_casefold_compat(wordlist[n], strlen(wordlist[n]), 0);
if(checktag(w[n])) ++ntags; /* count up tags */
}
/* find the longest non-stopword */
DB_TXN *tid) {
DBC *cursor;
DBT k, d;
- size_t root_len = strlen(root);
- int err;
+ const size_t root_len = root ? strlen(root) : 0;
+ int err, cberr;
struct kvp *data;
+ const char *track;
cursor = trackdb_opencursor(trackdb_tracksdb, tid);
- err = cursor->c_get(cursor, make_key(&k, root), prepare_data(&d),
- DB_SET_RANGE);
+ 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(k.size > root_len
- && !strncmp(k.data, root, root_len)
- && ((char *)k.data)[root_len] == '/') {
+ 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"))
- if((err = callback(xstrndup(k.data, k.size), data, u, tid)))
+ 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;
- err = cursor->c_get(cursor, &k, &d, DB_NEXT);
+ }
+ } else
+ err = cursor->c_get(cursor, &k, &d, DB_NEXT);
} else
break;
}
D(("disorderd-rescan terminate: %s", wstat(status)));
/* Our cache of file lookups is out of date now */
cache_clean(&cache_files_type);
+ eventlog("rescanned", (char *)0);
return 0;
}
error(0, "rescan already underway");
return;
}
- rescan_pid = subprogram(ev, RESCAN);
+ rescan_pid = subprogram(ev, RESCAN, -1);
ev_child(ev, rescan_pid, 0, reap_rescan, 0);
D(("started rescanner"));
const char *value,
const char *who) {
DB_TXN *tid;
- DBT k, d;
int err;
int state;
- 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);
- }
for(;;) {
tid = trackdb_begin_transaction();
- if(value)
- err = trackdb_globaldb->put(trackdb_globaldb, tid, &k, &d, 0);
- else
- err = trackdb_globaldb->del(trackdb_globaldb, tid, &k, 0);
- if(!err || err == DB_NOTFOUND) break;
- if(err != DB_LOCK_DEADLOCK)
- fatal(0, "error updating database: %s", db_strerror(err));
+ if(!(err = trackdb_set_global_tid(name, value, tid)))
+ break;
trackdb_abort_transaction(tid);
}
trackdb_commit_transaction(tid);
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;
return r;
}
-static int trackdb_get_global_tid(const char *name,
- DB_TXN *tid,
- const char **rp) {
+int trackdb_get_global_tid(const char *name,
+ DB_TXN *tid,
+ const char **rp) {
DBT k, d;
int err;
case DB_LOCK_DEADLOCK:
return err;
default:
- fatal(0, "error updating database: %s", db_strerror(err));
+ 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) {
indent-tabs-mode:nil
End:
*/
-/* arch-tag:/CBQ6uebrasgkefvjc+fHQ */
~mdw / disorder / blobdiff