X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/disorder/blobdiff_plain/10e226b3dc53a157ef57f3f9dbc606c70465bdc8..321f753675254b409a1ec3e578da0ae1940c4805:/disobedience/log.c

diff --git a/disobedience/log.c b/disobedience/log.c
index b2e3e68..af38643 100644
--- a/disobedience/log.c
+++ b/disobedience/log.c
@@ -17,10 +17,17 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  * USA
  */
+/** @file disobedience/log.c
+ * @brief State monitoring
+ *
+ * Disobedience relies on the server to tell when essentially anything changes,
+ * even if it initiated the change itself.  It uses the @c log command to
+ * achieve this.
+ */
 
 #include "disobedience.h"
 
-/* Functions --------------------------------------------------------------- */
+/* State monitoring -------------------------------------------------------- */
 
 static void log_connected(void *v);
 static void log_completed(void *v, const char *track);
@@ -34,6 +41,7 @@ static void log_removed(void *v, const char *id, const char *user);
 static void log_scratched(void *v, const char *track, const char *user);
 static void log_state(void *v, unsigned long state);
 static void log_volume(void *v, int l, int r);
+static void log_rescanned(void *v);
 
 /** @brief Callbacks for server state monitoring */
 const disorder_eclient_log_callbacks log_callbacks = {
@@ -48,109 +56,168 @@ const disorder_eclient_log_callbacks log_callbacks = {
   log_removed,
   log_scratched,
   log_state,
-  log_volume
+  log_volume,
+  log_rescanned
 };
 
-/* State monitoring -------------------------------------------------------- */
+/** @brief State monitor
+ *
+ * We keep a linked list of everything that is interested in state changes.
+ */
+struct monitor {
+  /** @brief Next monitor */
+  struct monitor *next;
+
+  /** @brief State bits of interest */
+  unsigned long mask;
 
+  /** @brief Function to call if any of @c mask change */
+  monitor_callback *callback;
+
+  /** @brief User data for callback */
+  void *u;
+};
+
+/** @brief List of monitors */
+static struct monitor *monitors;
+
+/** @brief Update everything */
 void all_update(void) {
-  playing_update();
   queue_update();
   recent_update();
-  control_update();
+  volume_update();
+  added_update();
 }
 
+/** @brief Called when the client connects
+ *
+ * Depending on server and network state the TCP connection to the server may
+ * go up or down many times during the lifetime of Disobedience.  This function
+ * is called whenever it connects.
+ *
+ * The intent is to use the monitor logic to achieve this in future.
+ */
 static void log_connected(void attribute((unused)) *v) {
-  struct callbackdata *cbd;
-
   /* Don't know what we might have missed while disconnected so update
    * everything.  We get this at startup too and this is how we do the initial
    * state fetch. */
   all_update();
-  /* Re-get the volume */
-  cbd = xmalloc(sizeof *cbd);
-  cbd->onerror = 0;
-  disorder_eclient_volume(client, log_volume, -1, -1, cbd);
 }
 
+/** @brief Called when the current track finishes playing */
 static void log_completed(void attribute((unused)) *v,
                           const char attribute((unused)) *track) {
-  playing = 0;
-  playing_update();
-  control_update();
 }
 
+/** @brief Called when the current track fails */
 static void log_failed(void attribute((unused)) *v,
                        const char attribute((unused)) *track,
                        const char attribute((unused)) *status) {
-  playing = 0;
-  playing_update();
-  control_update();
 }
 
+/** @brief Called when some track is moved within the queue */
 static void log_moved(void attribute((unused)) *v,
                       const char attribute((unused)) *user) {
-   queue_update();
+  queue_update();
 }
 
 static void log_playing(void attribute((unused)) *v,
                         const char attribute((unused)) *track,
                         const char attribute((unused)) *user) {
-  playing = 1;
-  playing_update();
-  control_update();
-  /* we get a log_removed() anyway so we don't need to update_queue() from
-   * here */
 }
 
+/** @brief Called when a track is added to the queue */
 static void log_queue(void attribute((unused)) *v,
                       struct queue_entry attribute((unused)) *q) {
   queue_update();
 }
 
+/** @brief Called when a track is added to the recently-played list */
 static void log_recent_added(void attribute((unused)) *v,
                              struct queue_entry attribute((unused)) *q) {
   recent_update();
 }
 
+/** @brief Called when a track is removed from the recently-played list
+ *
+ * We do nothing here - log_recent_added() suffices.
+ */
 static void log_recent_removed(void attribute((unused)) *v,
                                const char attribute((unused)) *id) {
   /* nothing - log_recent_added() will trigger the relevant update */
 }
 
+/** @brief Called when a track is removed from the queue */
 static void log_removed(void attribute((unused)) *v,
                         const char attribute((unused)) *id,
                         const char attribute((unused)) *user) {
+
   queue_update();
 }
 
+/** @brief Called when the current track is scratched */
 static void log_scratched(void attribute((unused)) *v,
                           const char attribute((unused)) *track,
                           const char attribute((unused)) *user) {
-  playing = 0;
-  playing_update();
-  control_update();
 }
 
+/** @brief Called when a state change occurs */
 static void log_state(void attribute((unused)) *v,
                       unsigned long state) {
+  const struct monitor *m;
+  unsigned long changes = state ^ last_state;
+  static int first = 1;
+  
+  if(first) {
+    changes = -1UL;
+    first = 0;
+  }
+  D(("log_state old=%s new=%s changed=%s",
+     disorder_eclient_interpret_state(last_state),
+     disorder_eclient_interpret_state(state),
+     disorder_eclient_interpret_state(changes)));
   last_state = state;
-  control_update();
-  /* If the track is paused or resume then the currently playing track is
-   * refetched so that we can continue to correctly calculate the played so-far
-   * field */
-  playing_update();
+  /* Tell anything that cares about the state change */
+  for(m = monitors; m; m = m->next) {
+    if(changes & m->mask)
+      m->callback(m->u);
+  }
 }
 
+/** @brief Called when volume changes */
 static void log_volume(void attribute((unused)) *v,
                        int l, int r) {
-  if(volume_l != l || volume_r != r) {
+  if(!rtp_supported && (volume_l != l || volume_r != r)) {
     volume_l = l;
     volume_r = r;
-    control_update();
+    volume_update();
   }
 }
 
+/** @brief Called when a rescan completes */
+static void log_rescanned(void attribute((unused)) *v) {
+  added_update();
+}
+
+/** @brief Add a monitor to the list
+ * @param callback Function to call
+ * @param u User data to pass to @p callback
+ * @param mask Mask of flags that @p callback cares about
+ *
+ * Pass @p mask as -1UL to match all flags.
+ */
+void register_monitor(monitor_callback *callback,
+                      void *u,
+                      unsigned long mask) {
+  struct monitor *m = xmalloc(sizeof *m);
+
+  m->next = monitors;
+  m->mask = mask;
+  m->callback = callback;
+  m->u = u;
+  monitors = m;
+}
+
 /*
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