debug destructors

hopefully works better with the gtk main loop but idk lol

src/application.vala

@@ -41,4 +41,8 @@ public class Audrey.Application : Adw.Application {
     private void on_preferences_action () {
         message ("app.preferences action activated");
     }
+
+    ~Application () {
+        debug ("destroying application");
+    }
 }

src/mpris.vala

@@ -20,6 +20,10 @@ class Mpris : Object {
     public string desktop_entry { owned get { return "eu.callcc.audrey"; } }
     public string[] supported_uri_schemes { owned get { return {}; } }
     public string[] supported_mime_types { owned get { return {}; } }
+
+    ~Mpris () {
+        debug ("destroying mpris");
+    }
 }
 
 [DBus (name = "org.mpris.MediaPlayer2.Player")]
@@ -62,4 +66,8 @@ class MprisPlayer : Object {
     public bool can_seek { get; default = false; }
     [CCode (notify = false)]
     public bool can_control { get { return false; } }
+
+    ~MprisPlayer () {
+        debug ("destroying mpris player");
+    }
 }

src/playbin.vala

@@ -52,14 +52,11 @@ public class Playbin : GLib.Object {
     public double position { get; private set; default = 0.0; }
     public double duration { get; private set; default = 0.0; }
 
-    public Subsonic.Client api { get; set; default = null; }
+    public weak Subsonic.Client api { get; set; default = null; }
 
     public ListStore _play_queue;
     public ListModel play_queue { get { return this._play_queue; } }
 
-    // try to prevent wait_event to be called twice
-    private bool is_handling_event = false;
-
     private async Mpv.Error mpv_command_async (string[] args) {
         CommandCallback cc = {};
 
@@ -70,6 +67,9 @@ public class Playbin : GLib.Object {
         return cc.error;
     }
 
+    // should be Mpv.WakeupCallback, but i think there's a vala bug here
+    private SourceOnceFunc wakeup_callback; // anchor reference here, mpv won't remind us
+
     public Playbin () {
         this._play_queue = new ListStore (typeof (Subsonic.Song));
 
@@ -83,10 +83,42 @@ public class Playbin : GLib.Object {
         assert (this.mpv.observe_property (2, "playlist-pos", Mpv.Format.INT64) >= 0);
         assert (this.mpv.observe_property (3, "pause", Mpv.Format.FLAG) >= 0);
 
-        this.mpv.wakeup_callback = () => {
-            Idle.add (() => {
-                if (this.is_handling_event) return false;
-                this.is_handling_event = true;
+        int wakeup_fds[2];
+        try {
+            assert (Unix.open_pipe (wakeup_fds, 0));
+        } catch (Error e) {
+            error (@"could not open pipe for mpv wakeup: $(e.message)");
+        }
+
+        IOChannel wakeup_read = new IOChannel.unix_new (wakeup_fds[0]);
+        IOChannel wakeup_write = new IOChannel.unix_new (wakeup_fds[1]);
+
+        wakeup_read.set_close_on_unref (true);
+        wakeup_write.set_close_on_unref (true);
+
+        try {
+            wakeup_read.set_encoding (null);
+            wakeup_write.set_encoding (null);
+            wakeup_write.set_buffered (false);
+        } catch (Error e) {
+            error (@"could not set up pipes for mpv wakeup: $(e.message)");
+        }
+
+        this.wakeup_callback = () => {
+            try {
+                wakeup_write.write_chars ({0}, null);
+            } catch (Error e) {
+                error (@"could not write to mpv wakeup pipe: $(e.message)");
+            }
+        };
+        this.mpv.wakeup_callback = this.wakeup_callback;
+
+        assert (0 < wakeup_read.add_watch (IOCondition.IN, (source, condition) => {
+            try {
+                wakeup_read.read_chars ({0}, null);
+            } catch (Error e) {
+                error (@"could not read from mpv wakeup pipe: $(e.message)");
+            }
 
             while (true) {
                 var event = this.mpv.wait_event (0.0);
@@ -196,10 +228,8 @@ public class Playbin : GLib.Object {
                 }
             }
             
-                this.is_handling_event = false;
-                return false;
-            });
-        };
+            return true;
+        }));
     }
 
     public void seek (double position) {
@@ -358,4 +388,8 @@ public class Playbin : GLib.Object {
             else if (this.play_queue_position >= to && this.play_queue_position < from) this.play_queue_position += 1;
         }
     }
+
+    ~Playbin () {
+        debug ("destroying playbin");
+    }
 }

src/subsonic.vala

@@ -248,4 +248,8 @@ public class Subsonic.Client : Object {
         assert (msg.get_status () == Soup.Status.OK);
         return yield new Gdk.Pixbuf.from_stream_async (stream, cancellable);
     }
+
+    ~Client () {
+        debug ("destroying subsonic client");
+    }
 }

src/ui/play_queue.vala

@@ -23,7 +23,7 @@ class Ui.PlayQueueSong : Gtk.Box {
 
     public string play_icon_name { get; set; default = ""; }
 
-    private Playbin playbin;
+    private weak Playbin playbin;
     public PlayQueueSong (Playbin playbin) {
         this.playbin = playbin;
 
@@ -110,7 +110,7 @@ class Ui.PlayQueueSong : Gtk.Box {
 
 [GtkTemplate (ui = "/eu/callcc/audrey/ui/play_queue.ui")]
 public class Ui.PlayQueue : Gtk.Box {
-    private Playbin _playbin;
+    private weak Playbin _playbin;
     public Playbin playbin {
         get { return _playbin; }
         set {
@@ -165,4 +165,8 @@ public class Ui.PlayQueue : Gtk.Box {
     [GtkCallback] private string visible_child_name (uint n_items) {
         return n_items > 0 ? "not-empty" : "empty";
     }
+
+    ~PlayQueue () {
+        debug ("destroying play queue widget");
+    }
 }

src/ui/playbar.vala

@@ -2,7 +2,7 @@
 class Ui.Playbar : Gtk.Box {
     public Subsonic.Song? song { get; set; }
     public Gdk.Paintable? playing_cover_art { get; set; }
-    public Playbin playbin { get; set; }
+    public weak Playbin playbin { get; set; }
     public bool show_cover_art { get; set; default = true; }
 
     public int volume {
@@ -82,4 +82,8 @@ class Ui.Playbar : Gtk.Box {
     [GtkCallback] private string song_album (Subsonic.Song? song) {
         return song == null ? "" : song.album;
     }
+
+    ~Playbar () {
+        debug ("destroying playbar widget");
+    }
 }

src/ui/setup.vala

@@ -128,4 +128,8 @@ public class Ui.Setup : Adw.PreferencesDialog {
             this.authn_can_edit = true;
         }, "server-url", this.server_url, "username", this.username);
     }
+
+    ~Setup () {
+        debug ("destroying setup dialog");
+    }
 }

src/ui/window.vala

@@ -115,4 +115,8 @@ class Ui.Window : Adw.ApplicationWindow {
     [GtkCallback] private bool show_playbar_cover_art (string? stack_child) {
         return stack_child != "play-queue";
     }
+
+    ~Window () {
+        debug ("destroying main window");
+    }
 }

src/vapi/mpv.vapi

@@ -31,7 +31,7 @@ namespace Mpv {
 
     public delegate void WakeupCallback ();
 
-    [CCode (cname = "mpv_handle", free_function = "mpv_destroy")]
+    [CCode (cname = "mpv_handle", free_function = "mpv_terminate_destroy")]
     [Compact]
     public class Handle {
         [CCode (cname = "mpv_create")]
@@ -43,7 +43,7 @@ namespace Mpv {
         [CCode (cname = "mpv_wait_event")]
         public unowned Event? wait_event (double timeout);
 
-        public WakeupCallback wakeup_callback {
+        public unowned WakeupCallback wakeup_callback {
             [CCode (cname = "mpv_set_wakeup_callback")] set;
         }
 
@@ -70,6 +70,10 @@ namespace Mpv {
 
         [CCode (cname = "mpv_observe_property")]
         public Error observe_property (uint64 reply_userdata, string name, Format format);
+
+        ~Handle () {
+            GLib.debug ("destroying mpv handle");
+        }
     }
 
     [CCode (cname = "mpv_format", cprefix = "MPV_FORMAT_", has_type_id = false)]