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client.rs
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client.rs
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use anyhow::anyhow;
use bluest::{Adapter, Characteristic, Device, DeviceId};
use futures_util::StreamExt;
use std::sync::Arc;
use tokio::sync::mpsc;
use tracing::{debug, info, warn};
use crate::command::Command;
#[derive(Debug)]
pub struct Client {
adapter: Arc<Adapter>,
device: Device,
}
pub enum UnconnectedClient {
Name(String),
DeviceId(DeviceId),
}
pub struct CharacteristicClient {
_adapter: Arc<Adapter>,
responses: mpsc::Receiver<Vec<u8>>,
characteristic: Arc<Characteristic>,
device: Device,
}
impl UnconnectedClient {
pub fn new(name: String) -> Self {
Self::Name(name)
}
pub fn with_id(device_id: DeviceId) -> Self {
Self::DeviceId(device_id)
}
pub async fn connect(self) -> Result<Client, anyhow::Error> {
let adapter = Adapter::default()
.await
.ok_or_else(|| anyhow!("Bluetooth adapter not found"))?;
adapter.wait_available().await?;
info!("looking for device");
let device = self.discover_device(&adapter).await?;
info!("found my device: {:?}", device);
adapter.connect_device(&device).await?;
info!("connected!");
device.pair().await?;
info!("paired!");
Ok(Client {
adapter: Arc::new(adapter),
device,
})
}
async fn discover_device(&self, adapter: &Adapter) -> Result<Device, anyhow::Error> {
let name = match &self {
Self::Name(name) => name,
Self::DeviceId(device_id) => {
return adapter.open_device(device_id).await.map_err(Into::into)
}
};
info!("starting scan");
let mut scan = adapter.scan(&[]).await?;
info!("scan started");
while let Some(discovered_device) = scan.next().await {
debug!(
"{} - {:?}: {:?}",
discovered_device
.device
.name()
.as_deref()
.unwrap_or("(unknown)"),
discovered_device.device.id(),
discovered_device.adv_data.services
);
if discovered_device
.device
.name()
.as_deref()
.map(|n| n == name)
.unwrap_or(false)
{
return Ok(discovered_device.device);
}
}
unreachable!();
}
}
impl Client {
pub async fn is_connected(&self) -> bool {
self.device.is_connected().await
}
pub fn device_id(&self) -> DeviceId {
self.device.id()
}
pub async fn with_characteristic(
&self,
service_id: &str,
characteristic_id: &str,
) -> Result<CharacteristicClient, anyhow::Error> {
let service = self
.device
.discover_services()
.await?
.into_iter()
.find(|service| service.uuid().to_string() == service_id)
.ok_or_else(|| anyhow!("Service not found"))?;
let characteristic = service
.discover_characteristics()
.await?
.into_iter()
.find(|characteristic| characteristic.uuid().to_string() == characteristic_id)
.ok_or_else(|| anyhow!("Characteristic not found"))?;
debug!(
"characteristic found: {:?} {:?}",
characteristic,
characteristic.properties().await?
);
let (tx, rx) = mpsc::channel(10);
let characteristic = Arc::new(characteristic);
let notify_characteristic = Arc::clone(&characteristic);
tokio::spawn(async move {
// 2. CL registers itself for indications on GDIO
let mut responses = notify_characteristic.notify().await.unwrap();
while let Some(bytes) = responses.next().await {
match bytes {
Ok(bytes) => tx.send(bytes).await.unwrap(),
Err(e) => warn!(error = ?e, "Error receiving notification"),
}
}
info!("Notification stream ended");
});
Ok(CharacteristicClient {
_adapter: Arc::clone(&self.adapter),
characteristic,
device: self.device.clone(),
responses: rx,
})
}
}
impl CharacteristicClient {
pub async fn write(&self, command: Command) -> Result<(), anyhow::Error> {
self.write_raw(command.into_bytes()).await
}
pub async fn write_raw(&self, bytes: impl AsRef<[u8]>) -> Result<(), anyhow::Error> {
if !self.device.is_connected().await {
return Err(anyhow!("Device not connected"));
}
self.characteristic.write(bytes.as_ref()).await?;
Ok(())
}
pub async fn receive(&mut self) -> Result<Command, anyhow::Error> {
let resp = self.receive_raw().await?;
let cmd = Command::parse(resp)?;
Ok(cmd)
}
pub async fn receive_raw(&mut self) -> Result<Vec<u8>, anyhow::Error> {
self.responses
.recv()
.await
.ok_or_else(|| anyhow!("No data received"))
}
}