desktop/src-tauri/src/rpc/udp.rs

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Rust
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2023-04-29 12:40:34 +08:00
use std::{collections::HashSet, sync::Arc, time::Duration};
use mdns_sd::{ServiceDaemon, ServiceEvent};
use paris::{error, info, warn};
use tokio::{
net::UdpSocket,
sync::{Mutex, OnceCell},
};
use super::BoardInfo;
#[derive(Debug, Clone)]
pub struct UdpRpc {
socket: Arc<Mutex<UdpSocket>>,
boards: Arc<Mutex<HashSet<BoardInfo>>>,
}
impl UdpRpc {
pub async fn global() -> &'static anyhow::Result<Self> {
static UDP_RPC: OnceCell<anyhow::Result<UdpRpc>> = OnceCell::const_new();
UDP_RPC
.get_or_init(|| async {
let udp_rpc = UdpRpc::new().await?;
udp_rpc.initialize().await;
Ok(udp_rpc)
})
.await
}
async fn new() -> anyhow::Result<Self> {
let socket = UdpSocket::bind("0.0.0.0:0").await?;
let socket = Arc::new(Mutex::new(socket));
let boards = Arc::new(Mutex::new(HashSet::new()));
Ok(Self { socket, boards })
}
async fn initialize(&self) {
let shared_self = Arc::new(self.clone());
tokio::spawn(async move {
loop {
match shared_self.search_boards().await {
Ok(_) => {
info!("search_boards finished");
}
Err(err) => {
error!("search_boards failed: {:?}", err);
tokio::time::sleep(Duration::from_secs(5)).await;
}
}
}
});
}
pub async fn search_boards(&self) -> anyhow::Result<()> {
let mdns = ServiceDaemon::new()?;
let shared_self = Arc::new(Mutex::new(self.clone()));
let service_type = "_ambient_light._udp.local.";
let receiver = mdns.browse(&service_type).map_err(|e| {
warn!("Failed to browse for {:?}: {:?}", service_type, e);
e
})?;
while let Ok(event) = receiver.recv() {
match event {
ServiceEvent::ServiceResolved(info) => {
info!(
"Resolved a new service: {} host: {} port: {} IP: {:?} TXT properties: {:?}",
info.get_fullname(),
info.get_hostname(),
info.get_port(),
info.get_addresses(),
info.get_properties(),
);
let shared_self = shared_self.lock().await;
let mut boards = shared_self.boards.clone().lock_owned().await;
let board = BoardInfo {
name: info.get_fullname().to_string(),
address: info.get_addresses().iter().next().unwrap().clone(),
port: info.get_port(),
};
if boards.insert(board.clone()) {
info!("added board {:?}", board);
}
}
other_event => {
warn!("{:?}", &other_event);
}
}
}
Ok(())
}
}