Implement Gtk Network Status (#165)

Implemented
- Switch reacts to burrow socket and network changes 
- meson as build system
- Basic diagnostics to ensure burrow is installed properly
- Flatpak / Meson Building

burrow-gtk/src/components/app.rs

@@ -0,0 +1,136 @@
+use super::*;
+use anyhow::Context;
+use std::time::Duration;
+
+const RECONNECT_POLL_TIME: Duration = Duration::from_secs(5);
+
+pub struct App {
+    daemon_client: Arc<Mutex<Option<DaemonClient>>>,
+    _settings_screen: Controller<settings_screen::SettingsScreen>,
+    switch_screen: AsyncController<switch_screen::SwitchScreen>,
+}
+
+#[derive(Debug)]
+pub enum AppMsg {
+    None,
+    PostInit,
+}
+
+impl App {
+    pub fn run() {
+        let app = RelmApp::new(config::ID);
+        Self::setup_gresources().unwrap();
+        Self::setup_i18n().unwrap();
+
+        app.run_async::<App>(());
+    }
+
+    fn setup_i18n() -> Result<()> {
+        gettextrs::setlocale(gettextrs::LocaleCategory::LcAll, "");
+        gettextrs::bindtextdomain(config::GETTEXT_PACKAGE, config::LOCALEDIR)?;
+        gettextrs::bind_textdomain_codeset(config::GETTEXT_PACKAGE, "UTF-8")?;
+        gettextrs::textdomain(config::GETTEXT_PACKAGE)?;
+        Ok(())
+    }
+
+    fn setup_gresources() -> Result<()> {
+        gtk::gio::resources_register_include!("compiled.gresource")
+            .context("Failed to register and include compiled gresource.")
+    }
+}
+
+#[relm4::component(pub, async)]
+impl AsyncComponent for App {
+    type Init = ();
+    type Input = AppMsg;
+    type Output = ();
+    type CommandOutput = ();
+
+    view! {
+        adw::Window {
+            set_title: Some("Burrow"),
+            set_default_size: (640, 480),
+        }
+    }
+
+    async fn init(
+        _: Self::Init,
+        root: Self::Root,
+        sender: AsyncComponentSender<Self>,
+    ) -> AsyncComponentParts<Self> {
+        let daemon_client = Arc::new(Mutex::new(DaemonClient::new().await.ok()));
+
+        let switch_screen = switch_screen::SwitchScreen::builder()
+            .launch(switch_screen::SwitchScreenInit {
+                daemon_client: Arc::clone(&daemon_client),
+            })
+            .forward(sender.input_sender(), |_| AppMsg::None);
+
+        let settings_screen = settings_screen::SettingsScreen::builder()
+            .launch(settings_screen::SettingsScreenInit {
+                daemon_client: Arc::clone(&daemon_client),
+            })
+            .forward(sender.input_sender(), |_| AppMsg::None);
+
+        let widgets = view_output!();
+
+        let view_stack = adw::ViewStack::new();
+        view_stack.add_titled(switch_screen.widget(), None, "Switch");
+        view_stack.add_titled(settings_screen.widget(), None, "Settings");
+
+        let view_switcher_bar = adw::ViewSwitcherBar::builder().stack(&view_stack).build();
+        view_switcher_bar.set_reveal(true);
+
+        let toolbar = adw::ToolbarView::new();
+        toolbar.add_top_bar(
+            &adw::HeaderBar::builder()
+                .title_widget(&gtk::Label::new(Some("Burrow")))
+                .build(),
+        );
+        toolbar.add_bottom_bar(&view_switcher_bar);
+        toolbar.set_content(Some(&view_stack));
+
+        root.set_content(Some(&toolbar));
+
+        sender.input(AppMsg::PostInit);
+
+        let model = App {
+            daemon_client,
+            switch_screen,
+            _settings_screen: settings_screen,
+        };
+
+        AsyncComponentParts { model, widgets }
+    }
+
+    async fn update(
+        &mut self,
+        _msg: Self::Input,
+        _sender: AsyncComponentSender<Self>,
+        _root: &Self::Root,
+    ) {
+        loop {
+            tokio::time::sleep(RECONNECT_POLL_TIME).await;
+            {
+                let mut daemon_client = self.daemon_client.lock().await;
+                let mut disconnected_daemon_client = false;
+
+                if let Some(daemon_client) = daemon_client.as_mut() {
+                    if let Err(_e) = daemon_client.send_command(DaemonCommand::ServerInfo).await {
+                        disconnected_daemon_client = true;
+                        self.switch_screen
+                            .emit(switch_screen::SwitchScreenMsg::DaemonDisconnect);
+                    }
+                }
+
+                if disconnected_daemon_client || daemon_client.is_none() {
+                    *daemon_client = DaemonClient::new().await.ok();
+                    if daemon_client.is_some() {
+                        self.switch_screen
+                            .emit(switch_screen::SwitchScreenMsg::DaemonReconnect);
+                    }
+                }
+            }
+        }
+    }
+}