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use futures::StreamExt;
use tokio::sync::mpsc;
use std::collections::HashMap;
/// 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>,
device_changed_tx: mpsc::Sender<crate::cache::DeviceInfo>,
/// Local device cache for monitoring
devices: std::sync::Arc<tokio::sync::RwLock<HashMap<String, 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>,
device_changed_tx: mpsc::Sender<crate::cache::DeviceInfo>,
) -> Self {
Self {
connection,
manager,
device_added_tx,
device_removed_tx,
device_changed_tx,
devices: std::sync::Arc::new(tokio::sync::RwLock::new(HashMap::new())),
}
}
/// 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();
let devices = self.devices.clone();
loop {
if let Some(signal) = interfaces_removed.next().await {
let args = signal.args().unwrap();
let path = args.object_path().as_str();
if let Some(removed_dev) = devices.write().await.remove(path) {
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();
let devices = self.devices.clone();
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) = interfaces.get("Address") {
let addr = address
.downcast_ref::<zbus::zvariant::Str>()
.ok()
.map(|s| s.as_str().to_owned())
.unwrap_or_default()
.to_string();
let alias = interfaces
.get("Alias")
.and_then(|alias| alias.downcast_ref::<zbus::zvariant::Str>().ok())
.map(|s| s.as_str().to_owned())
.unwrap_or(addr.to_string())
.to_string();
let connected = interfaces
.get("Connected")
.and_then(|v| v.downcast_ref::<bool>().ok())
.unwrap_or(false);
let paired = interfaces
.get("Paired")
.and_then(|v| v.downcast_ref::<bool>().ok())
.unwrap_or(false);
let address_type = interfaces
.get("AddressType")
.and_then(|v| v.downcast_ref::<zbus::zvariant::Str>().ok())
.map(|s| s.as_str().to_owned());
let connectable = interfaces
.get("Connectable")
.and_then(|v| v.downcast_ref::<bool>().ok());
let discoverable = interfaces
.get("Discoverable")
.and_then(|v| v.downcast_ref::<bool>().ok());
let discoverable_timeout = interfaces
.get("DiscoverableTimeout")
.and_then(|v| v.downcast_ref::<u32>().ok());
let discovering = interfaces
.get("Discovering")
.and_then(|v| v.downcast_ref::<bool>().ok());
let name = interfaces
.get("Name")
.and_then(|v| v.downcast_ref::<zbus::zvariant::Str>().ok())
.map(|s| s.as_str().to_owned());
let pairable = interfaces
.get("Pairable")
.and_then(|v| v.downcast_ref::<bool>().ok());
let pairable_timeout = interfaces
.get("PairableTimeout")
.and_then(|v| v.downcast_ref::<u32>().ok());
let power_state = interfaces
.get("PowerState")
.and_then(|v| v.downcast_ref::<zbus::zvariant::Str>().ok())
.map(|s| s.as_str().to_owned());
let powered = interfaces
.get("Powered")
.and_then(|v| v.downcast_ref::<bool>().ok());
let rssi = interfaces
.get("RSSI")
.and_then(|v| v.downcast_ref::<i16>().ok());
let path = args.object_path().to_string();
let new_device = crate::cache::DeviceInfo {
address: addr.to_string(),
alias,
connected,
paired,
address_type,
connectable,
discoverable,
discoverable_timeout,
discovering,
name,
pairable,
pairable_timeout,
power_state,
powered,
rssi,
};
devices.write().await.insert(path.clone(), new_device.clone());
let _ = self.monitor_device_properties(
self.connection.clone(),
std::sync::Arc::new(path),
devices.clone(),
self.device_changed_tx.clone(),
)
.await;
let _ = self.device_added_tx.send(new_device).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>,
devices: std::sync::Arc<tokio::sync::RwLock<HashMap<String, crate::cache::DeviceInfo>>>,
device_changed_tx: mpsc::Sender<crate::cache::DeviceInfo>,
) -> zbus::Result<()> {
let path_clone = object_path.clone();
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) = devices.read().await.get(object_path.as_str()).cloned() {
let mut changed = false;
if let Some(new_value) = changed_props.get("Connected") {
if let Ok(val) = new_value.downcast_ref::<bool>() {
device.connected = val;
changed = true;
}
}
if let Some(new_value) = changed_props.get("Paired") {
if let Ok(val) = new_value.downcast_ref::<bool>() {
device.paired = val;
changed = true;
}
}
if let Some(new_value) = changed_props.get("Alias") {
if let Ok(val) = new_value.downcast_ref::<zbus::zvariant::Str>() {
device.alias = val.as_str().to_owned();
changed = true;
}
}
if changed {
devices.write().await.insert(path_clone.to_string(), device.clone());
let _ = device_changed_tx.send(device).await;
}
}
}
}
});
Ok(())
}
}