chore: Add type PeripheralId

Some platforms do not use a BDAddr to identify a specific device. This new
type allows different platforms to use their own identifier.

Author: paroga

examples/event_driven_discovery.rs

@@ -40,37 +40,31 @@ async fn main() -> Result<(), Box<dyn Error>> {
     // thread (not task, as this library does not yet use async channels).
     while let Some(event) = events.next().await {
         match event {
-            CentralEvent::DeviceDiscovered(bd_addr) => {
-                println!("DeviceDiscovered: {:?}", bd_addr);
+            CentralEvent::DeviceDiscovered(id) => {
+                println!("DeviceDiscovered: {:?}", id);
             }
-            CentralEvent::DeviceConnected(bd_addr) => {
-                println!("DeviceConnected: {:?}", bd_addr);
+            CentralEvent::DeviceConnected(id) => {
+                println!("DeviceConnected: {:?}", id);
             }
-            CentralEvent::DeviceDisconnected(bd_addr) => {
-                println!("DeviceDisconnected: {:?}", bd_addr);
+            CentralEvent::DeviceDisconnected(id) => {
+                println!("DeviceDisconnected: {:?}", id);
             }
             CentralEvent::ManufacturerDataAdvertisement {
-                address,
+                id,
                 manufacturer_data,
             } => {
                 println!(
                     "ManufacturerDataAdvertisement: {:?}, {:?}",
-                    address, manufacturer_data
+                    id, manufacturer_data
                 );
             }
-            CentralEvent::ServiceDataAdvertisement {
-                address,
-                service_data,
-            } => {
-                println!(
-                    "ServiceDataAdvertisement: {:?}, {:?}",
-                    address, service_data
-                );
+            CentralEvent::ServiceDataAdvertisement { id, service_data } => {
+                println!("ServiceDataAdvertisement: {:?}, {:?}", id, service_data);
             }
-            CentralEvent::ServicesAdvertisement { address, services } => {
+            CentralEvent::ServicesAdvertisement { id, services } => {
                 let services: Vec<String> =
                     services.into_iter().map(|s| s.to_short_string()).collect();
-                println!("ServicesAdvertisement: {:?}, {:?}", address, services);
+                println!("ServicesAdvertisement: {:?}, {:?}", id, services);
             }
             _ => {}
         }

src/api/mod.rs

@@ -41,6 +41,8 @@ use uuid::Uuid;
 
 pub use self::bdaddr::{BDAddr, ParseBDAddrError};
 
+use crate::platform::PeripheralId;
+
 #[cfg_attr(
     feature = "serde",
     derive(Serialize, Deserialize),
@@ -193,6 +195,9 @@ pub enum WriteType {
 /// as well as functions for communication.
 #[async_trait]
 pub trait Peripheral: Send + Sync + Clone + Debug {
+    /// Returns the unique identifier of the peripheral.
+    fn id(&self) -> PeripheralId;
+
     /// Returns the MAC address of the peripheral.
     fn address(&self) -> BDAddr;
 
@@ -260,23 +265,23 @@ pub trait Peripheral: Send + Sync + Clone + Debug {
 )]
 #[derive(Debug, Clone)]
 pub enum CentralEvent {
-    DeviceDiscovered(BDAddr),
-    DeviceUpdated(BDAddr),
-    DeviceConnected(BDAddr),
-    DeviceDisconnected(BDAddr),
+    DeviceDiscovered(PeripheralId),
+    DeviceUpdated(PeripheralId),
+    DeviceConnected(PeripheralId),
+    DeviceDisconnected(PeripheralId),
     /// Emitted when a Manufacturer Data advertisement has been received from a device
     ManufacturerDataAdvertisement {
-        address: BDAddr,
+        id: PeripheralId,
         manufacturer_data: HashMap<u16, Vec<u8>>,
     },
     /// Emitted when a Service Data advertisement has been received from a device
     ServiceDataAdvertisement {
-        address: BDAddr,
+        id: PeripheralId,
         service_data: HashMap<Uuid, Vec<u8>>,
     },
     /// Emitted when the advertised services for a device has been updated
     ServicesAdvertisement {
-        address: BDAddr,
+        id: PeripheralId,
         services: Vec<Uuid>,
     },
 }
@@ -304,7 +309,7 @@ pub trait Central: Send + Sync + Clone {
     async fn peripherals(&self) -> Result<Vec<Self::Peripheral>>;
 
     /// Returns a particular [`Peripheral`] by its address if it has been discovered.
-    async fn peripheral(&self, address: BDAddr) -> Result<Self::Peripheral>;
+    async fn peripheral(&self, id: &PeripheralId) -> Result<Self::Peripheral>;
 
     /// Add a [`Peripheral`] from a MAC address without a scan result. Not supported on all Bluetooth systems.
     async fn add_peripheral(&self, address: BDAddr) -> Result<Self::Peripheral>;

src/bluez/adapter.rs

@@ -1,4 +1,4 @@
-use super::peripheral::Peripheral;
+use super::peripheral::{Peripheral, PeripheralId};
 use crate::api::{BDAddr, Central, CentralEvent};
 use crate::{Error, Result};
 use async_trait::async_trait;
@@ -37,7 +37,7 @@ impl Central for Adapter {
         let initial_events = stream::iter(
             devices
                 .into_iter()
-                .map(|device| CentralEvent::DeviceDiscovered(BDAddr::from(&device.mac_address))),
+                .map(|device| CentralEvent::DeviceDiscovered((&device.mac_address).into())),
         );
 
         let session = self.session.clone();
@@ -68,12 +68,12 @@ impl Central for Adapter {
             .collect())
     }
 
-    async fn peripheral(&self, address: BDAddr) -> Result<Peripheral> {
+    async fn peripheral(&self, id: &PeripheralId) -> Result<Peripheral> {
         let devices = self.session.get_devices().await?;
         devices
             .into_iter()
             .find_map(|device| {
-                if BDAddr::from(&device.mac_address) == address {
+                if PeripheralId::from(&device.mac_address) == *id {
                     Some(Peripheral::new(self.session.clone(), device))
                 } else {
                     None
@@ -130,7 +130,7 @@ async fn central_event(event: BluetoothEvent, session: BluetoothSession) -> Opti
         } => {
             let device = session.get_device_info(&id).await.ok()?;
             Some(CentralEvent::ManufacturerDataAdvertisement {
-                address: (&device.mac_address).into(),
+                id: (&device.mac_address).into(),
                 manufacturer_data,
             })
         }
@@ -140,7 +140,7 @@ async fn central_event(event: BluetoothEvent, session: BluetoothSession) -> Opti
         } => {
             let device = session.get_device_info(&id).await.ok()?;
             Some(CentralEvent::ServiceDataAdvertisement {
-                address: (&device.mac_address).into(),
+                id: (&device.mac_address).into(),
                 service_data,
             })
         }
@@ -150,7 +150,7 @@ async fn central_event(event: BluetoothEvent, session: BluetoothSession) -> Opti
         } => {
             let device = session.get_device_info(&id).await.ok()?;
             Some(CentralEvent::ServicesAdvertisement {
-                address: (&device.mac_address).into(),
+                id: (&device.mac_address).into(),
                 services,
             })
         }

src/bluez/peripheral.rs

@@ -5,6 +5,10 @@ use bluez_async::{
 };
 use futures::future::ready;
 use futures::stream::{Stream, StreamExt};
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+#[cfg(feature = "serde")]
+use serde_cr as serde;
 use std::collections::{BTreeSet, HashMap};
 use std::pin::Pin;
 use std::sync::{Arc, Mutex};
@@ -22,6 +26,14 @@ struct ServiceInternal {
     characteristics: HashMap<Uuid, CharacteristicInfo>,
 }
 
+#[cfg_attr(
+    feature = "serde",
+    derive(Serialize, Deserialize),
+    serde(crate = "serde_cr")
+)]
+#[derive(Clone, Debug, Eq, Hash, PartialEq)]
+pub struct PeripheralId(BDAddr);
+
 /// Implementation of [api::Peripheral](crate::api::Peripheral).
 #[derive(Clone, Debug)]
 pub struct Peripheral {
@@ -75,6 +87,10 @@ impl Peripheral {
 
 #[async_trait]
 impl api::Peripheral for Peripheral {
+    fn id(&self) -> PeripheralId {
+        PeripheralId(self.address())
+    }
+
     fn address(&self) -> BDAddr {
         self.mac_address
     }
@@ -229,6 +245,12 @@ impl From<&MacAddress> for BDAddr {
     }
 }
 
+impl From<&MacAddress> for PeripheralId {
+    fn from(mac_address: &MacAddress) -> Self {
+        PeripheralId(BDAddr::from(mac_address))
+    }
+}
+
 impl From<bluez_async::AddressType> for AddressType {
     fn from(address_type: bluez_async::AddressType) -> Self {
         match address_type {

src/common/adapter_manager.rs

@@ -11,7 +11,8 @@
 // following copyright:
 //
 // Copyright (c) 2014 The Rust Project Developers
-use crate::api::{BDAddr, CentralEvent, Peripheral};
+use crate::api::{CentralEvent, Peripheral};
+use crate::platform::PeripheralId;
 use dashmap::{mapref::one::RefMut, DashMap};
 use futures::stream::{Stream, StreamExt};
 use log::trace;
@@ -30,7 +31,7 @@ where
 
 #[derive(Debug)]
 struct Shared<PeripheralType> {
-    peripherals: DashMap<BDAddr, PeripheralType>,
+    peripherals: DashMap<PeripheralId, PeripheralType>,
     events_channel: broadcast::Sender<CentralEvent>,
 }
 
@@ -52,8 +53,8 @@ where
 {
     pub fn emit(&self, event: CentralEvent) {
         match event {
-            CentralEvent::DeviceDisconnected(ref addr) => {
-                self.shared.peripherals.remove(addr);
+            CentralEvent::DeviceDisconnected(ref id) => {
+                self.shared.peripherals.remove(id);
             }
             _ => {}
         }
@@ -74,13 +75,12 @@ where
         }))
     }
 
-    pub fn add_peripheral(&self, addr: BDAddr, peripheral: PeripheralType) {
+    pub fn add_peripheral(&self, peripheral: PeripheralType) {
         assert!(
-            !self.shared.peripherals.contains_key(&addr),
+            !self.shared.peripherals.contains_key(&peripheral.id()),
             "Adding a peripheral that's already in the map."
         );
-        assert_eq!(peripheral.address(), addr, "Device has unexpected address."); // TODO remove addr argument
-        self.shared.peripherals.insert(addr, peripheral);
+        self.shared.peripherals.insert(peripheral.id(), peripheral);
     }
 
     pub fn peripherals(&self) -> Vec<PeripheralType> {
@@ -91,14 +91,17 @@ where
             .collect()
     }
 
-    pub fn peripheral_mut(&self, address: BDAddr) -> Option<RefMut<BDAddr, PeripheralType>> {
-        self.shared.peripherals.get_mut(&address)
+    pub fn peripheral_mut(
+        &self,
+        id: &PeripheralId,
+    ) -> Option<RefMut<PeripheralId, PeripheralType>> {
+        self.shared.peripherals.get_mut(id)
     }
 
-    pub fn peripheral(&self, address: BDAddr) -> Option<PeripheralType> {
+    pub fn peripheral(&self, id: &PeripheralId) -> Option<PeripheralType> {
         self.shared
             .peripherals
-            .get(&address)
+            .get(id)
             .map(|val| val.value().clone())
     }
 }

src/corebluetooth/adapter.rs

@@ -1,5 +1,5 @@
 use super::internal::{run_corebluetooth_thread, CoreBluetoothEvent, CoreBluetoothMessage};
-use super::peripheral::Peripheral;
+use super::peripheral::{Peripheral, PeripheralId};
 use crate::api::{BDAddr, Central, CentralEvent};
 use crate::common::adapter_manager::AdapterManager;
 use crate::{Error, Result};
@@ -19,11 +19,6 @@ pub struct Adapter {
     sender: Sender<CoreBluetoothMessage>,
 }
 
-pub(crate) fn uuid_to_bdaddr(uuid: &str) -> BDAddr {
-    let b: [u8; 6] = uuid.as_bytes()[0..6].try_into().unwrap();
-    BDAddr::try_from(b).unwrap()
-}
-
 impl Adapter {
     pub(crate) async fn new() -> Result<Self> {
         let (sender, mut receiver) = mpsc::channel(256);
@@ -53,31 +48,24 @@ impl Adapter {
                         name,
                         event_receiver,
                     } => {
-                        // TODO Gotta change uuid into a BDAddr for now. Expand
-                        // library identifier type. :(
-                        let id = uuid_to_bdaddr(&uuid.to_string());
-                        manager_clone.add_peripheral(
-                            id,
-                            Peripheral::new(
-                                uuid,
-                                name,
-                                manager_clone.clone(),
-                                event_receiver,
-                                adapter_sender_clone.clone(),
-                            ),
-                        );
-                        manager_clone.emit(CentralEvent::DeviceDiscovered(id));
+                        manager_clone.add_peripheral(Peripheral::new(
+                            uuid,
+                            name,
+                            manager_clone.clone(),
+                            event_receiver,
+                            adapter_sender_clone.clone(),
+                        ));
+                        manager_clone.emit(CentralEvent::DeviceDiscovered(uuid.into()));
                     }
                     CoreBluetoothEvent::DeviceUpdated { uuid, name } => {
-                        let id = uuid_to_bdaddr(&uuid.to_string());
-                        if let Some(entry) = manager_clone.peripheral_mut(id) {
+                        let id = uuid.into();
+                        if let Some(entry) = manager_clone.peripheral_mut(&id) {
                             entry.value().update_name(&name);
                             manager_clone.emit(CentralEvent::DeviceUpdated(id));
                         }
                     }
                     CoreBluetoothEvent::DeviceDisconnected { uuid } => {
-                        let id = uuid_to_bdaddr(&uuid.to_string());
-                        manager_clone.emit(CentralEvent::DeviceDisconnected(id));
+                        manager_clone.emit(CentralEvent::DeviceDisconnected(uuid.into()));
                     }
                     _ => {}
                 }
@@ -119,10 +107,8 @@ impl Central for Adapter {
         Ok(self.manager.peripherals())
     }
 
-    async fn peripheral(&self, address: BDAddr) -> Result<Peripheral> {
-        self.manager
-            .peripheral(address)
-            .ok_or(Error::DeviceNotFound)
+    async fn peripheral(&self, id: &PeripheralId) -> Result<Peripheral> {
+        self.manager.peripheral(id).ok_or(Error::DeviceNotFound)
     }
 
     async fn add_peripheral(&self, _address: BDAddr) -> Result<Peripheral> {