utils(dirty): replace Notify with watch

easytier/src/dns/node.rs

@@ -166,7 +166,7 @@ impl DnsNode {
                     last_heartbeat = Instant::now();
                 }
 
-                _ = self.mgr.dirty.notified() => {}
+                _ = self.mgr.dirty.wait() => {}
 
                 event = subscriber.recv() => {
                     match event {

easytier/src/dns/peer_mgr.rs

@@ -75,7 +75,6 @@ impl DnsPeerMgrInner {
     pub async fn refresh(&self, peer_id: PeerId) {
         if peer_id == self.peer_mgr.my_peer_id() {
             self.dirty.mark();
-            self.dirty.notify_one();
             return;
         }
 
@@ -91,25 +90,23 @@ impl DnsPeerMgrInner {
             return;
         }
 
-        self.dirty.mark();
+        let mut invalidate = route.dns.is_empty();
 
-        let invalidate = route.dns.is_empty()
-            || match self.fetch(peer_id).await {
-                Ok(info) => {
-                    self.peers.insert(peer_id, info).await;
-                    false
-                }
+        if !invalidate {
+            match self.fetch(peer_id).await {
+                Ok(info) => self.peers.insert(peer_id, info).await,
                 Err(error) => {
                     tracing::warn!(%peer_id, ?error, "failed to fetch dns export config from peer");
-                    true
+                    invalidate = true;
                 }
             };
+        }
 
         if invalidate {
             self.peers.invalidate(&peer_id).await;
         }
 
-        self.dirty.notify_one();
+        self.dirty.mark();
     }
 
     #[instrument(skip(self), level = "trace", ret)]

easytier/src/dns/server.rs

@@ -225,7 +225,7 @@ impl DnsServer {
 
         let reload_catalog = async {
             loop {
-                dirty.catalog.notified().await;
+                dirty.catalog.wait().await;
                 if dirty.catalog.reset() {
                     self.catalog.replace(self.mgr.catalog()).await;
                 }
@@ -235,7 +235,7 @@ impl DnsServer {
 
         let reload_addresses = async {
             loop {
-                dirty.addresses.notified().await;
+                dirty.addresses.wait().await;
                 if dirty.addresses.reset() {
                     if let Err(e) = self.reload_addresses(self.mgr.iter_addresses()).await {
                         tracing::error!("failed to reload addresses: {:?}", e);
@@ -248,7 +248,7 @@ impl DnsServer {
 
         let reload_listeners = async {
             loop {
-                dirty.listeners.notified().await;
+                dirty.listeners.wait().await;
                 if dirty.listeners.reset() {
                     if let Err(e) = self
                         .reload_listeners(self.mgr.iter_listeners(), &mut runtime)

easytier/src/dns/utils/dirty.rs

@@ -1,39 +1,32 @@
-use derive_more::Deref;
-use std::sync::atomic::{AtomicBool, Ordering};
-use tokio::sync::Notify;
+use tokio::sync::watch;
 
-#[derive(Debug, Deref)]
+#[derive(Debug)]
 pub struct DirtyFlag {
-    dirty: AtomicBool,
-    #[deref]
-    notify: Notify,
+    tx: watch::Sender<bool>,
+    rx: watch::Receiver<bool>,
 }
 
 impl DirtyFlag {
     pub fn new(value: bool) -> Self {
-        let notify = Notify::new();
-
-        if value {
-            notify.notify_one();
-        }
-
-        Self {
-            dirty: AtomicBool::new(value),
-            notify,
-        }
+        let (tx, rx) = watch::channel(value);
+        Self { tx, rx }
     }
 
     pub fn mark(&self) {
-        self.dirty.store(true, Ordering::Release);
-        self.notify.notify_one();
+        self.tx.send(true).ok();
     }
 
     pub fn peek(&self) -> bool {
-        self.dirty.load(Ordering::Acquire)
+        *self.tx.borrow()
     }
 
     pub fn reset(&self) -> bool {
-        self.dirty.swap(false, Ordering::Acquire)
+        self.tx.send_replace(false)
+    }
+
+    pub async fn wait(&self) {
+        let mut rx = self.rx.clone();
+        let _ = rx.wait_for(|v| *v).await;
     }
 }