X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/7736e1cc4f9caf63686a425cf716ab54c67647e4..b9bbb6c8bd8630fe4321045ce57174c4890bfa46:/lib/trackdb.c

diff --git a/lib/trackdb.c b/lib/trackdb.c
index 6a93fba..7cc3719 100644
--- a/lib/trackdb.c
+++ b/lib/trackdb.c
@@ -145,6 +145,17 @@ DB *trackdb_globaldb;                   /* global preferences */
  */
 DB *trackdb_noticeddb;                   /* when track noticed */
 
+/** @brief The schedule database
+ *
+ * - Keys are ID strings, generated at random
+ * - Values are encoded key-value pairs
+ * - There can be more than one value per key
+ * - Data cannot be reconstructed
+ *
+ * See @ref server/schedule.c for further information.
+ */
+DB *trackdb_scheduledb;
+
 /** @brief The user database
  * - Keys are usernames
  * - Values are encoded key-value pairs
@@ -162,6 +173,16 @@ static int compare(DB attribute((unused)) *db_,
   return compare_path_raw(a->data, a->size, b->data, b->size);
 }
 
+/** @brief Test whether the track database can be read
+ * @return 1 if it can, 0 if it cannot
+ */
+int trackdb_readable(void) {
+  char *usersdb;
+
+  byte_xasprintf(&usersdb, "%s/users.db", config->home);
+  return access(usersdb, R_OK) == 0;
+}
+
 /** @brief Open database environment
  * @param flags Flags word
  *
@@ -450,6 +471,7 @@ void trackdb_open(int flags) {
   trackdb_globaldb = open_db("global.db", 0, DB_HASH, dbflags, 0666);
   trackdb_noticeddb = open_db("noticed.db",
                              DB_DUPSORT, DB_BTREE, dbflags, 0666);
+  trackdb_scheduledb = open_db("schedule.db", 0, DB_HASH, dbflags, 0666);
   if(!trackdb_existing_database) {
     /* Stash the database version */
     char buf[32];
@@ -480,6 +502,8 @@ void trackdb_close(void) {
     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_scheduledb->close(trackdb_scheduledb, 0)))
+    fatal(0, "error closing schedule.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;
@@ -1004,7 +1028,8 @@ int trackdb_notice_tid(const char *track,
   int err, n;
   struct kvp *t, *a, *p;
   int t_changed, ret;
-  char *alias, **w;
+  char *alias, **w, *noticed;
+  time_t now;
 
   /* notice whether the tracks.db entry changes */
   t_changed = 0;
@@ -1015,6 +1040,12 @@ int trackdb_notice_tid(const char *track,
   /* this is a real track */
   t_changed += kvp_set(&t, "_alias_for", 0);
   t_changed += kvp_set(&t, "_path", path);
+  time(&now);
+  if(ret == DB_NOTFOUND) {
+    /* It's a new track; record the time */
+    byte_xasprintf(&noticed, "%lld", (long long)now);
+    t_changed += kvp_set(&t, "_noticed", noticed);
+  }
   /* if we have an alias record it in the database */
   if((err = compute_alias(&alias, track, p, tid))) return err;
   if(alias) {
@@ -1039,10 +1070,8 @@ int trackdb_notice_tid(const char *track,
     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);
@@ -1372,6 +1401,60 @@ void trackdb_stats_subprocess(ev_source *ev,
   ev_reader_new(ev, p[0], stats_read, stats_error, d, "disorder-stats reader");
 }
 
+/** @brief Parse a track name part preference
+ * @param name Preference name
+ * @param partp Where to store part name
+ * @param contextp Where to store context name
+ * @return 0 on success, non-0 if parse fails
+ */
+static int trackdb__parse_namepref(const char *name,
+                                   char **partp,
+                                   char **contextp) {
+  char *c;
+  static const char prefix[] = "trackname_";
+  
+  if(strncmp(name, prefix, strlen(prefix)))
+    return -1;                          /* not trackname_* at all */
+  name += strlen(prefix);
+  /* There had better be a _ between context and part */
+  c = strchr(name, '_');
+  if(!c)
+    return -1;
+  /* Context is first in the pref name even though most APIs have the part
+   * first.  Confusing; sorry. */
+  *contextp = xstrndup(name, c - name);
+  ++c;
+  /* There had better NOT be a second _ */
+  if(strchr(c, '_'))
+    return -1;
+  *partp = xstrdup(c);
+  return 0;
+}
+
+/** @brief Compute the default value for a track preference
+ * @param track Track name
+ * @param name Preference name
+ * @return Default value or 0 if none/not known
+ */
+static const char *trackdb__default(const char *track, const char *name) {
+  char *context, *part;
+  
+  if(!trackdb__parse_namepref(name, &part, &context)) {
+    /* We can work out the default for a trackname_ pref */
+    return trackname_part(track, context, part);
+  } else if(!strcmp(name, "weight")) {
+    /* We know the default weight */
+    return "90000";
+  } else if(!strcmp(name, "pick_at_random")) {
+    /* By default everything is eligible for picking at random */
+    return "1";
+  } else if(!strcmp(name, "tags")) {
+    /* By default everything no track has any tags */
+    return "";
+  }
+  return 0;
+}
+
 /* set a pref (remove if value=0) */
 int trackdb_set(const char *track,
                 const char *name,
@@ -1380,9 +1463,15 @@ int trackdb_set(const char *track,
   DB_TXN *tid;
   int err, cmp;
   char *oldalias, *newalias, **oldtags = 0, **newtags;
+  const char *def;
 
+  /* If the value matches the default then unset instead, to keep the database
+   * tidy.  Older versions did not have this feature so your database may yet
+   * have some default values stored in it. */
   if(value) {
-    /* TODO: if value matches default then set value=0 */
+    def = trackdb__default(track, name);
+    if(def && !strcmp(value, def))
+      value = 0;
   }
 
   for(;;) {
@@ -2082,6 +2171,28 @@ int trackdb_scan(const char *root,
 
 /* trackdb_rescan ************************************************************/
 
+/** @brief Node in the list of rescan-complete callbacks */
+struct rescanned_node {
+  struct rescanned_node *next;
+  void (*rescanned)(void *ru);
+  void *ru;
+};
+
+/** @brief List of rescan-complete callbacks */
+static struct rescanned_node *rescanned_list;
+
+/** @brief Add a rescan completion callback */
+void trackdb_add_rescanned(void (*rescanned)(void *ru),
+                           void *ru) {
+  if(rescanned) {
+    struct rescanned_node *n = xmalloc(sizeof *n);
+    n->next = rescanned_list;
+    n->rescanned = rescanned;
+    n->ru = ru;
+    rescanned_list = n;
+  }
+}
+
 /* called when the rescanner terminates */
 static int reap_rescan(ev_source attribute((unused)) *ev,
                        pid_t pid,
@@ -2096,23 +2207,37 @@ static int reap_rescan(ev_source attribute((unused)) *ev,
   /* Our cache of file lookups is out of date now */
   cache_clean(&cache_files_type);
   eventlog("rescanned", (char *)0);
+  /* Call rescanned callbacks */
+  while(rescanned_list) {
+    void (*rescanned)(void *u) = rescanned_list->rescanned;
+    void *ru = rescanned_list->ru;
+
+    rescanned_list = rescanned_list->next;
+    rescanned(ru);
+  }
   return 0;
 }
 
 /** @brief Initiate a rescan
  * @param ev Event loop or 0 to block
  * @param recheck 1 to recheck lengths, 0 to suppress check
+ * @param rescanned Called on completion (if not NULL)
+ * @param u Passed to @p rescanned
  */
-void trackdb_rescan(ev_source *ev, int recheck) {
+void trackdb_rescan(ev_source *ev, int recheck,
+                    void (*rescanned)(void *ru),
+                    void *ru) {
   int w;
 
   if(rescan_pid != -1) {
+    trackdb_add_rescanned(rescanned, ru);
     error(0, "rescan already underway");
     return;
   }
   rescan_pid = subprogram(ev, -1, RESCAN,
                           recheck ? "--check" : "--no-check",
                           (char *)0);
+  trackdb_add_rescanned(rescanned, ru);
   if(ev) {
     ev_child(ev, rescan_pid, 0, reap_rescan, 0);
     D(("started rescanner"));
@@ -2132,6 +2257,11 @@ int trackdb_rescan_cancel(void) {
   return 1;
 }
 
+/** @brief Return true if a rescan is underway */
+int trackdb_rescan_underway(void) {
+  return rescan_pid != -1;
+}
+
 /* global prefs **************************************************************/
 
 void trackdb_set_global(const char *name,
@@ -2630,10 +2760,13 @@ int trackdb_edituserinfo(const char *user,
       return -1;
     }
   } else if(!strcmp(key, "email")) {
-    if(!strchr(value, '@')) {
-      error(0, "invalid email address '%s' for user '%s'", user, value);
-      return -1;
-    }
+    if(*value) {
+      if(!strchr(value, '@')) {
+        error(0, "invalid email address '%s' for user '%s'", user, value);
+        return -1;
+      }
+    } else
+      value = 0;                        /* no email -> remove key */
   } else if(!strcmp(key, "created")) {
     error(0, "cannot change creation date for user '%s'", user);
     return -1;