floss: Track freshness of found devices (52b2a225) · Commits · e / os / android_packages_modules_Bluetooth

system/gd/rust/linux/client/src/callbacks.rs

+7 −3

Original line number	Diff line number	Diff line
		@@ -125,12 +125,16 @@ impl IBluetoothCallback for BtCallback {
		print_info!("Found device: {:?}", remote_device);
		}

		fn on_device_cleared(&self, remote_device: BluetoothDevice) {
		match self.context.lock().unwrap().found_devices.remove(&remote_device.address) {
		Some(_) => print_info!("Removed device: {:?}", remote_device),
		None => (),
		};
		}

		fn on_discovering_changed(&self, discovering: bool) {
		self.context.lock().unwrap().discovering_state = discovering;

		if discovering {
		self.context.lock().unwrap().found_devices.clear();
		}
		print_info!("Discovering: {}", discovering);
		}

system/gd/rust/linux/client/src/dbus_iface.rs

+3 −0

Original line number	Diff line number	Diff line
		@@ -183,6 +183,9 @@ impl IBluetoothCallback for IBluetoothCallbackDBus {
		#[dbus_method("OnDeviceFound")]
		fn on_device_found(&self, remote_device: BluetoothDevice) {}

		#[dbus_method("OnDeviceCleared")]
		fn on_device_cleared(&self, remote_device: BluetoothDevice) {}

		#[dbus_method("OnDiscoveringChanged")]
		fn on_discovering_changed(&self, discovering: bool) {}

system/gd/rust/linux/service/src/iface_bluetooth.rs

+4 −0

Original line number	Diff line number	Diff line
		@@ -51,6 +51,10 @@ impl IBluetoothCallback for BluetoothCallbackDBus {
		fn on_device_found(&self, remote_device: BluetoothDevice) {
		dbus_generated!()
		}
		#[dbus_method("OnDeviceCleared")]
		fn on_device_cleared(&self, remote_device: BluetoothDevice) {
		dbus_generated!()
		}
		#[dbus_method("OnDiscoveringChanged")]
		fn on_discovering_changed(&self, discovering: bool) {
		dbus_generated!()

system/gd/rust/linux/stack/src/bluetooth.rs

+157 −72

Original line number	Diff line number	Diff line
		@@ -18,8 +18,11 @@ use num_traits::cast::ToPrimitive;
		use std::collections::HashMap;
		use std::sync::Arc;
		use std::sync::Mutex;
		use std::time::Duration;
		use std::time::Instant;
		use tokio::sync::mpsc::Sender;
		use tokio::task::JoinHandle;
		use tokio::time;

		use crate::bluetooth_media::{BluetoothMedia, IBluetoothMedia, MediaActions};
		use crate::uuid::{Profile, UuidHelper};
		@@ -28,6 +31,11 @@ use crate::{BluetoothCallbackType, Message, RPCProxy};
		const DEFAULT_DISCOVERY_TIMEOUT_MS: u64 = 12800;
		const MIN_ADV_INSTANCES_FOR_MULTI_ADV: u8 = 5;

		/// Devices that were last seen longer than this duration are considered stale
		/// if they haven't already bonded or connected. Once this duration expires, the
		/// clear event should be sent to clients.
		const FOUND_DEVICE_FRESHNESS: Duration = Duration::from_secs(30);

		/// Defines the adapter API.
		pub trait IBluetooth {
		/// Adds a callback from a client who wishes to observe adapter events.
		@@ -196,6 +204,7 @@ struct BluetoothDeviceContext {
		pub bond_state: BtBondState,
		pub acl_state: BtAclState,
		pub info: BluetoothDevice,
		pub last_seen: Instant,
		pub properties: HashMap<BtPropertyType, BluetoothProperty>,
		}

		@@ -204,10 +213,16 @@ impl BluetoothDeviceContext {
		bond_state: BtBondState,
		acl_state: BtAclState,
		info: BluetoothDevice,
		last_seen: Instant,
		properties: Vec<BluetoothProperty>,
		) -> BluetoothDeviceContext {
		let mut device =
		BluetoothDeviceContext { bond_state, acl_state, info, properties: HashMap::new() };
		let mut device = BluetoothDeviceContext {
		bond_state,
		acl_state,
		info,
		last_seen,
		properties: HashMap::new(),
		};
		device.update_properties(properties);
		device
		}
		@@ -227,6 +242,11 @@ impl BluetoothDeviceContext {
		self.properties.insert(prop.get_type(), prop);
		}
		}

		/// Mark this device as seen.
		pub(crate) fn seen(&mut self) {
		self.last_seen = Instant::now();
		}
		}

		/// The interface for adapter callbacks registered through `IBluetooth::register_callback`.
		@@ -243,6 +263,9 @@ pub trait IBluetoothCallback: RPCProxy {
		/// When a device is found via discovery.
		fn on_device_found(&self, remote_device: BluetoothDevice);

		/// When a device is cleared from discovered devices cache.
		fn on_device_cleared(&self, remote_device: BluetoothDevice);

		/// When the discovery state is changed.
		fn on_discovering_changed(&self, discovering: bool);

		@@ -277,16 +300,17 @@ pub struct Bluetooth {
		connection_callbacks: HashMap<u32, Box<dyn IBluetoothConnectionCallback + Send>>,
		discovering_started: Instant,
		hh: Option<HidHost>,
		is_connectable: bool,
		is_discovering: bool,
		local_address: Option<RawAddress>,
		properties: HashMap<BtPropertyType, BluetoothProperty>,
		profiles_ready: bool,
		found_devices: HashMap<String, BluetoothDeviceContext>,
		freshness_check: Option<JoinHandle<()>>,
		sdp: Option<Sdp>,
		state: BtState,
		tx: Sender<Message>,
		uuid_helper: UuidHelper,
		is_connectable: bool,
		}

		impl Bluetooth {
		@@ -304,16 +328,17 @@ impl Bluetooth {
		bluetooth_media,
		discovering_started: Instant::now(),
		intf,
		is_connectable: false,
		is_discovering: false,
		local_address: None,
		properties: HashMap::new(),
		profiles_ready: false,
		found_devices: HashMap::new(),
		freshness_check: None,
		sdp: None,
		state: BtState::Off,
		tx,
		uuid_helper: UuidHelper::new(),
		is_connectable: false,
		}
		}

		@@ -401,19 +426,16 @@ impl Bluetooth {
		};
		}

		fn get_remote_device_if_found(
		&self,
		device: &BluetoothDevice,
		) -> Option<&BluetoothDeviceContext> {
		self.bonded_devices.get(&device.address).or_else(\|\| self.found_devices.get(&device.address))
		fn get_remote_device_if_found(&self, address: &str) -> Option<&BluetoothDeviceContext> {
		self.bonded_devices.get(address).or_else(\|\| self.found_devices.get(address))
		}

		fn get_remote_device_if_found_mut(
		&mut self,
		device: &BluetoothDevice,
		address: &str,
		) -> Option<&mut BluetoothDeviceContext> {
		match self.bonded_devices.get_mut(&device.address) {
		None => self.found_devices.get_mut(&device.address),
		match self.bonded_devices.get_mut(address) {
		None => self.found_devices.get_mut(address),
		some => some,
		}
		}
		@@ -423,7 +445,7 @@ impl Bluetooth {
		device: &BluetoothDevice,
		property_type: &BtPropertyType,
		) -> Option<BluetoothProperty> {
		self.get_remote_device_if_found(&device)
		self.get_remote_device_if_found(&device.address)
		.and_then(\|d\| d.properties.get(property_type).and_then(\|p\| Some(p.clone())))
		}

		@@ -433,7 +455,7 @@ impl Bluetooth {
		property_type: BtPropertyType,
		property: BluetoothProperty,
		) -> Result<(), ()> {
		let mut remote_device = match self.get_remote_device_if_found_mut(&device) {
		let remote_device = match self.get_remote_device_if_found_mut(&device.address) {
		Some(d) => d,
		None => {
		return Err(());
		@@ -451,6 +473,48 @@ impl Bluetooth {
		self.intf.lock().unwrap().set_remote_device_property(addr, property);
		Ok(())
		}

		/// Check whether found devices are still fresh. If they're outside the
		/// freshness window, send a notification to clear the device from clients.
		pub(crate) fn trigger_freshness_check(&mut self) {
		// Drop previous joinhandle
		self.freshness_check = None;

		// A found device is considered fresh if:
		// * It was last seen less than \|FOUND_DEVICE_FRESHNESS\| ago.
		// * It is currently connected.
		fn is_fresh(d: &BluetoothDeviceContext, now: &Instant) -> bool {
		let fresh_at = d.last_seen + FOUND_DEVICE_FRESHNESS;
		now < &fresh_at \|\| d.acl_state == BtAclState::Connected
		}

		let now = Instant::now();
		let stale_devices: Vec<BluetoothDevice> = self
		.found_devices
		.iter()
		.filter(\|(_, d)\| !is_fresh(d, &now))
		.map(\|(_, d)\| d.info.clone())
		.collect();

		// Retain only devices that are fresh.
		self.found_devices.retain(\|_, d\| is_fresh(d, &now));

		for d in stale_devices {
		self.for_all_callbacks(\|callback\| {
		callback.on_device_cleared(d.clone());
		});
		}

		// If we have any fresh devices remaining, re-queue a freshness check.
		if self.found_devices.len() > 0 {
		let txl = self.tx.clone();

		self.freshness_check = Some(tokio::spawn(async move {
		time::sleep(FOUND_DEVICE_FRESHNESS).await;
		let _ = txl.send(Message::DeviceFreshnessCheck).await;
		}));
		}
		}
		}

		#[btif_callbacks_dispatcher(Bluetooth, dispatch_base_callbacks, BaseCallbacks)]
		@@ -593,6 +657,7 @@ impl BtifBluetoothCallbacks for Bluetooth {
		BtBondState::Bonded,
		BtAclState::Disconnected,
		BluetoothDevice::new(address.clone(), "".to_string()),
		Instant::now(),
		vec![],
		));
		}
		@@ -621,11 +686,13 @@ impl BtifBluetoothCallbacks for Bluetooth {

		if let Some(existing) = self.found_devices.get_mut(&address) {
		existing.update_properties(properties);
		existing.seen();
		} else {
		let device_with_props = BluetoothDeviceContext::new(
		BtBondState::NotBonded,
		BtAclState::Disconnected,
		device,
		Instant::now(),
		properties,
		);
		self.found_devices.insert(address.clone(), device_with_props);
		@@ -639,9 +706,11 @@ impl BtifBluetoothCallbacks for Bluetooth {
		}

		fn discovery_state(&mut self, state: BtDiscoveryState) {
		// Clear found devices when discovery session starts
		if !self.is_discovering && &state == &BtDiscoveryState::Started {
		self.found_devices.clear();
		let is_discovering = &state == &BtDiscoveryState::Started;

		// No-op if we're updating the state to the same value again.
		if &is_discovering == &self.is_discovering {
		return;
		}

		// Cache discovering state
		@@ -653,6 +722,13 @@ impl BtifBluetoothCallbacks for Bluetooth {
		self.for_all_callbacks(\|callback\| {
		callback.on_discovering_changed(state == BtDiscoveryState::Started);
		});

		// Stopped discovering and no freshness check is active. Immediately do
		// freshness check which will schedule a recurring future until all
		// entries are cleared.
		if !is_discovering && self.freshness_check.is_none() {
		self.trigger_freshness_check();
		}
		}

		fn ssp_request(
		@@ -706,6 +782,7 @@ impl BtifBluetoothCallbacks for Bluetooth {
		bond_state.clone(),
		BtAclState::Disconnected,
		BluetoothDevice::new(address.clone(), "".to_string()),
		Instant::now(),
		vec![],
		),
		};
		@@ -736,27 +813,31 @@ impl BtifBluetoothCallbacks for Bluetooth {
		properties: Vec<BluetoothProperty>,
		) {
		let address = addr.to_string();
		// Device should be in either found devices or bonded devices
		// If it isn't in either, create it and put it found devices.
		let device = if self.bonded_devices.contains_key(&address) {
		self.bonded_devices.get_mut(&address)
		} else if self.found_devices.contains_key(&address) {
		self.found_devices.get_mut(&address)
		} else {
		let device = match self.get_remote_device_if_found_mut(&address) {
		None => {
		self.found_devices.insert(
		address.clone(),
		BluetoothDeviceContext::new(
		BtBondState::NotBonded,
		BtAclState::Disconnected,
		BluetoothDevice::new(address.clone(), String::from("")),
		Instant::now(),
		vec![],
		),
		);

		self.found_devices.get_mut(&address)
		}
		some => some,
		};

		device.unwrap().update_properties(properties);
		match device {
		Some(d) => {
		d.update_properties(properties);
		d.seen();
		}
		None => (),
		};
		}

		fn acl_state(
		@@ -773,30 +854,31 @@ impl BtifBluetoothCallbacks for Bluetooth {
		}

		let address = addr.to_string();

		let found = if self.bonded_devices.contains_key(&address) {
		self.bonded_devices.get_mut(&address)
		} else if self.found_devices.contains_key(&address) {
		self.found_devices.get_mut(&address)
		} else {
		let device = match self.get_remote_device_if_found_mut(&address) {
		None => {
		self.found_devices.insert(
		address.clone(),
		BluetoothDeviceContext::new(
		BtBondState::NotBonded,
		BtAclState::Disconnected,
		BluetoothDevice::new(address.clone(), String::from("")),
		Instant::now(),
		vec![],
		),
		);

		self.found_devices.get_mut(&address)
		}
		some => some,
		};

		match device {
		Some(found) => {
		// Only notify if there's been a change in state
		let prev_state = &found.as_ref().unwrap().acl_state;
		let prev_state = &found.acl_state;
		if prev_state != &state {
		let device = found.as_ref().unwrap().info.clone();
		found.unwrap().acl_state = state.clone();
		let device = found.info.clone();
		found.acl_state = state.clone();

		match state {
		BtAclState::Connected => {
		@@ -812,6 +894,9 @@ impl BtifBluetoothCallbacks for Bluetooth {
		};
		}
		}
		None => (),
		};
		}
		}

		// TODO: Add unit tests for this implementation
		@@ -1219,7 +1304,7 @@ impl IBluetooth for Bluetooth {
		}

		fn fetch_remote_uuids(&self, device: BluetoothDevice) -> bool {
		if self.get_remote_device_if_found(&device).is_none() {
		if self.get_remote_device_if_found(&device.address).is_none() {
		warn!("Won't fetch UUIDs on unknown device {}", device.address);
		return false;
		}

system/gd/rust/linux/stack/src/lib.rs

+7 −0

Original line number	Diff line number	Diff line
		@@ -53,6 +53,9 @@ pub enum Message {
		// Client callback disconnections
		BluetoothCallbackDisconnected(u32, BluetoothCallbackType),

		// Update list of found devices and remove old instances.
		DeviceFreshnessCheck,

		// Suspend related
		SuspendCallbackRegistered(u32),
		SuspendCallbackDisconnected(u32),
		@@ -126,6 +129,10 @@ impl Stack {
		bluetooth.lock().unwrap().callback_disconnected(id, cb_type);
		}

		Message::DeviceFreshnessCheck => {
		bluetooth.lock().unwrap().trigger_freshness_check();
		}

		Message::SuspendCallbackRegistered(id) => {
		suspend.lock().unwrap().callback_registered(id);
		}