bluebus 0.1.5

A Rust library for interacting with Bluetooth devices using the org.bluez D-Bus API.
Documentation 
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use futures::StreamExt;
use tokio::sync::mpsc;

/// Monitors Bluetooth device connections and disconnections.
/// This struct listens for events related to devices being added or removed from the system.
pub struct Monitor {
    /// Shared reference to the D-Bus connection.
    connection: std::sync::Arc<zbus::Connection>,
    /// Proxy for managing object events.
    manager: std::sync::Arc<crate::ObjectManagerProxy<'static>>,
    device_added_tx: mpsc::Sender<crate::cache::DeviceInfo>,
    device_removed_tx: mpsc::Sender<crate::cache::DeviceInfo>,
}

impl Monitor {
    /// Creates a new monitor instance.
    /// 
    /// # Arguments
    /// * `connection` - Shared D-Bus connection.
    /// * `manager` - Proxy to the object manager.
    /// 
    /// # Returns
    /// A new `Monitor` instance.
    pub async fn new(
        connection: std::sync::Arc<zbus::Connection>,
        manager: std::sync::Arc<crate::ObjectManagerProxy<'static>>,
        device_added_tx: mpsc::Sender<crate::cache::DeviceInfo>,
        device_removed_tx: mpsc::Sender<crate::cache::DeviceInfo>,
    ) -> Self {
        Self {
            connection,
            manager,
            device_added_tx,
            device_removed_tx,
        }
    }

    /// Monitors the removal of Bluetooth devices.
    /// This listens for D-Bus signals when devices are removed and logs the event.
    pub async fn monitor_device_removed(&self) {
        let mut interfaces_removed = self.manager.receive_interfaces_removed().await.unwrap();
        loop {
            if let Some(signal) = interfaces_removed.next().await {
                let args = signal.args().unwrap();

                if let Some(removed_dev) = crate::remove_device(args.object_path().as_str()) {
                    let _ = self.device_removed_tx.send(removed_dev).await;
                }
            }
        }
    }

    /// Monitors the addition of new Bluetooth devices.
    /// This listens for D-Bus signals when new devices are added and logs the event.
    pub async fn monitor_device_added(&self) {
        let mut interfaces_added = self.manager.receive_interfaces_added().await.unwrap();
        loop {
            if let Some(signal) = interfaces_added.next().await {
                let args = signal.args().unwrap();
                if let Some(interfaces) = args.interfaces().get("org.bluez.Device1") {
                    if let (Some(address), Some(als), Some(cnnctd), Some(prd)) = (
                        interfaces.get("Address"), interfaces.get("Alias"), interfaces
                        .get("Connected"), interfaces
                        .get("Paired")) {
                            let addr = address.to_string();
                            let alias = als.to_string();
                            let connected = cnnctd
                                .downcast_ref::<bool>()
                                .unwrap();
                            let paired = prd
                                .downcast_ref::<bool>()
                                .unwrap();

                            let path = args.object_path().to_string();

                            let new_device = crate::cache::DeviceInfo {
                                address: addr.to_string(),
                                alias,
                                connected,
                                paired,
                            };
                            crate::add_or_update_device(path, &new_device);
                            self.monitor_device_properties(
                                self.connection.clone(),
                                std::sync::Arc::new(args.object_path.to_string()),
                            )
                            .await
                            .unwrap();
                            let _ = self.device_added_tx.send(new_device.clone()).await;
                    }
                }
            }
        }
    }

    /// Monitors property changes of Bluetooth devices.
    /// Updates internal cache when a device property (e.g., alias, connection status) changes.
    async fn monitor_device_properties(
        &self,
        conn: std::sync::Arc<zbus::Connection>,
        object_path: std::sync::Arc<String>,
    ) -> zbus::Result<()> {
        tokio::spawn(async move {
            let props = zbus::fdo::PropertiesProxy::builder(&conn)
                .destination("org.bluez")
                .unwrap()
                .path(object_path.as_str())
                .unwrap()
                .build()
                .await
                .unwrap();

            let mut props_changed = props.receive_properties_changed().await.unwrap();

            while let Some(signal) = props_changed.next().await {
                let args = signal.args().unwrap();
                let interface_name = args.interface_name().to_string();
                let changed_props = args.changed_properties();

                if interface_name == "org.bluez.Device1" {
                    if let Some(mut device) = crate::get_device(object_path.as_str()) {
                        if let Some(new_value) = changed_props.get("Connected") {
                            let val = new_value.downcast_ref::<bool>().unwrap();
                            device.connected = val;
                        }
                        if let Some(new_value) = changed_props.get("Paired") {
                            let val = new_value.downcast_ref::<bool>().unwrap();
                            device.paired = val;
                        }
                        if let Some(new_value) = changed_props.get("Alias") {
                            let val = new_value.downcast_ref::<String>().unwrap();
                            device.alias = val;
                        }
                        crate::add_or_update_device(object_path.to_string(), &device);
                    }
                }
            }
        });
        Ok(())
    }
}