pipewire connection: Reconnection to PipeWire server

Cargo.lock

@@ -500,6 +500,7 @@ version = "0.4.1"
 dependencies = [
  "glib",
  "libadwaita",
+ "libc",
  "log",
  "once_cell",
  "pipewire",

Cargo.toml

@@ -22,3 +22,4 @@ log = "0.4.11"
 
 once_cell = "1.7.2"
 
+libc = "0.2"

src/graph_manager.rs

@@ -65,7 +65,8 @@ mod imp {
                         PipewireMessage::LinkFormatChanged { id, media_type } => imp.link_format_changed(id, media_type),
                         PipewireMessage::NodeRemoved { id } => imp.remove_node(id),
                         PipewireMessage::PortRemoved { id, node_id } => imp.remove_port(id, node_id),
-                        PipewireMessage::LinkRemoved { id } => imp.remove_link(id)
+                        PipewireMessage::LinkRemoved { id } => imp.remove_link(id),
+                        PipewireMessage::Disconnected => imp.clear(),
                     };
                     glib::ControlFlow::Continue
                 }
@@ -280,6 +281,11 @@ mod imp {
 
             self.obj().graph().remove_link(&link);
         }
+
+        fn clear(&self) {
+            self.items.borrow_mut().clear();
+            self.obj().graph().clear();
+        }
     }
 }
 

src/main.rs

@@ -74,6 +74,7 @@ pub enum PipewireMessage {
     LinkRemoved {
         id: u32,
     },
+    Disconnected,
 }
 
 #[derive(Debug, Clone)]

src/pipewire_connection/mod.rs

@@ -16,10 +16,15 @@
 
 mod state;
 
-use std::{cell::RefCell, collections::HashMap, rc::Rc};
+use std::{
+    cell::{Cell, RefCell},
+    collections::HashMap,
+    rc::Rc,
+    time::Duration,
+};
 
 use adw::glib::{self, clone};
-use log::{debug, info, warn};
+use log::{debug, error, info, warn};
 use pipewire::{
     link::{Link, LinkChangeMask, LinkInfo, LinkListener, LinkState},
     port::{Port, PortChangeMask, PortInfo, PortListener},
@@ -28,7 +33,7 @@ use pipewire::{
     registry::{GlobalObject, Registry},
     spa::{
         param::{ParamInfoFlags, ParamType},
-        ForeignDict,
+        ForeignDict, SpaResult,
     },
     types::ObjectType,
     Context, Core, MainLoop,
@@ -51,56 +56,124 @@ enum ProxyItem {
 /// The "main" function of the pipewire thread.
 pub(super) fn thread_main(
     gtk_sender: glib::Sender<PipewireMessage>,
-    pw_receiver: pipewire::channel::Receiver<GtkMessage>,
+    mut pw_receiver: pipewire::channel::Receiver<GtkMessage>,
 ) {
     let mainloop = MainLoop::new().expect("Failed to create mainloop");
-    let context = Context::new(&mainloop).expect("Failed to create context");
-    let core = Rc::new(context.connect(None).expect("Failed to connect to remote"));
-    let registry = Rc::new(core.get_registry().expect("Failed to get registry"));
+    let context = Rc::new(Context::new(&mainloop).expect("Failed to create context"));
+    let is_stopped = Rc::new(Cell::new(false));
 
-    // Keep proxies and their listeners alive so that we can receive info events.
-    let proxies = Rc::new(RefCell::new(HashMap::new()));
+    while !is_stopped.get() {
+        // Try to connect
+        let core = match context.connect(None) {
+            Ok(core) => Rc::new(core),
+            Err(_) => {
+                // If connection is failed, try to connect every 200ms
+                let interval = Some(Duration::from_millis(200));
 
-    let state = Rc::new(RefCell::new(State::new()));
-
-    let _receiver = pw_receiver.attach(&mainloop, {
-        clone!(@strong mainloop, @weak core, @weak registry, @strong state => move |msg| match msg {
-            GtkMessage::ToggleLink { port_from, port_to } => toggle_link(port_from, port_to, &core, &registry, &state),
-            GtkMessage::Terminate => mainloop.quit(),
-        })
-    });
-
-    let _listener = registry
-        .add_listener_local()
-        .global(clone!(@strong gtk_sender, @weak registry, @strong proxies, @strong state =>
-            move |global| match global.type_ {
-                ObjectType::Node => handle_node(global, &gtk_sender, &state),
-                ObjectType::Port => handle_port(global, &gtk_sender, &registry, &proxies, &state),
-                ObjectType::Link => handle_link(global, &gtk_sender, &registry, &proxies, &state),
-                _ => {
-                    // Other objects are not interesting to us
-                }
-            }
-        ))
-        .global_remove(clone!(@strong proxies, @strong state => move |id| {
-            if let Some(item) = state.borrow_mut().remove(id) {
-                gtk_sender.send(match item {
-                    Item::Node { .. } => PipewireMessage::NodeRemoved {id},
-                    Item::Port { node_id } => PipewireMessage::PortRemoved {id, node_id},
-                    Item::Link { .. } => PipewireMessage::LinkRemoved {id},
-                }).expect("Failed to send message");
-            } else {
-                warn!(
-                    "Attempted to remove item with id {} that is not saved in state",
-                    id
+                let core = Rc::new(RefCell::new(None));
+                let timer = mainloop.add_timer(
+                    clone!(@strong mainloop, @strong context, @strong core => move |_| {
+                        if let Ok(x) = context.connect(None) {
+                            core.replace(Some(x));
+                            mainloop.quit();
+                        }
+                    }),
                 );
+
+                timer
+                    .update_timer(interval, interval)
+                    .into_result()
+                    .unwrap();
+
+                let receiver = pw_receiver.attach(&mainloop, {
+                    clone!(@strong mainloop, @strong is_stopped => move |msg|
+                        if let GtkMessage::Terminate = msg {
+                            // main thread requested stop
+                            is_stopped.set(true);
+                            mainloop.quit();
+                        }
+                    )
+                });
+
+                mainloop.run();
+                pw_receiver = receiver.deattach();
+
+                if is_stopped.get() {
+                    break;
+                }
+
+                Rc::new(core.take().unwrap())
             }
+        };
 
-            proxies.borrow_mut().remove(&id);
-        }))
-        .register();
+        let registry = Rc::new(core.get_registry().expect("Failed to get registry"));
 
-    mainloop.run();
+        // Keep proxies and their listeners alive so that we can receive info events.
+        let proxies = Rc::new(RefCell::new(HashMap::new()));
+        let state = Rc::new(RefCell::new(State::new()));
+
+        let receiver = pw_receiver.attach(&mainloop, {
+            clone!(@strong mainloop, @weak core, @weak registry, @strong state, @strong is_stopped => move |msg| match msg {
+                GtkMessage::ToggleLink { port_from, port_to } => toggle_link(port_from, port_to, &core, &registry, &state),
+                GtkMessage::Terminate => {
+                    // main thread requested stop
+                    is_stopped.set(true);
+                    mainloop.quit();
+                }
+            })
+        });
+
+        let gtk_sender = gtk_sender.clone();
+        let _listener = core.add_listener_local()
+            .error(clone!(@strong mainloop, @strong gtk_sender, @strong is_stopped => move |id, _seq, res, message| {
+                if id != pipewire::PW_ID_CORE {
+                    return;
+                }
+
+                if res == -libc::EPIPE {
+                    gtk_sender.send(PipewireMessage::Disconnected)
+                        .expect("Failed to send message");
+                    mainloop.quit();
+                } else {
+                    let serr = SpaResult::from_c(res).into_result().unwrap_err();
+                    error!("Pipewire Core received error {serr}: {message}");
+                }
+            }))
+            .register();
+
+        let _listener = registry
+            .add_listener_local()
+            .global(clone!(@strong gtk_sender, @weak registry, @strong proxies, @strong state =>
+                move |global| match global.type_ {
+                    ObjectType::Node => handle_node(global, &gtk_sender, &state),
+                    ObjectType::Port => handle_port(global, &gtk_sender, &registry, &proxies, &state),
+                    ObjectType::Link => handle_link(global, &gtk_sender, &registry, &proxies, &state),
+                    _ => {
+                        // Other objects are not interesting to us
+                    }
+                }
+            ))
+            .global_remove(clone!(@strong proxies, @strong state => move |id| {
+                if let Some(item) = state.borrow_mut().remove(id) {
+                    gtk_sender.send(match item {
+                        Item::Node { .. } => PipewireMessage::NodeRemoved {id},
+                        Item::Port { node_id } => PipewireMessage::PortRemoved {id, node_id},
+                        Item::Link { .. } => PipewireMessage::LinkRemoved {id},
+                    }).expect("Failed to send message");
+                } else {
+                    warn!(
+                        "Attempted to remove item with id {} that is not saved in state",
+                        id
+                    );
+                }
+
+                proxies.borrow_mut().remove(&id);
+            }))
+            .register();
+
+        mainloop.run();
+        pw_receiver = receiver.deattach();
+    }
 }
 
 /// Handle a new node being added

src/ui/graph/graph_view.rs

@@ -796,6 +796,14 @@ impl GraphView {
         self.queue_draw();
     }
 
+    pub fn clear(&mut self) {
+        self.imp().links.borrow_mut().clear();
+        for (node, _) in self.imp().nodes.borrow_mut().drain() {
+            node.unparent();
+        }
+        self.queue_draw();
+    }
+
     /// Get the position of the specified node inside the graphview.
     ///
     /// The returned position is in canvas-space (non-zoomed, (0, 0) fixed in the middle of the canvas).