fix: restart controller when watch dies

src/controller.rs

@@ -7,34 +7,39 @@ use kube::{
     runtime::WatchStreamExt,
     Api,
 };
-use log::{error, info, debug};
+use log::{debug, error, info};
 use tokio_stream::StreamExt;
 
 // This is the main controller function.
 pub async fn controller(client: kube::Client, config: TaintConfig) {
     let node_api: Api<Node> = Api::all(client);
-    let stream = watcher(node_api.clone(), watcher::Config::default()).applied_objects();
-    let mut stream = std::pin::pin!(stream);
-    let mut next = stream.try_next().await;
 
-    while let Ok(Some(node)) = next {
-
-        for label_taint in &config.label_taints {
-            if !node_matches_labels(&label_taint.selector, &node) {
-                continue;
+    loop {
+        info!("starting watching nodes");
+        let stream = watcher(node_api.clone(), watcher::Config::default()).applied_objects();
+        let mut stream = std::pin::pin!(stream);
+        let mut next = stream.try_next().await;
+
+        while let Ok(Some(node)) = next {
+            for label_taint in &config.label_taints {
+                if !node_matches_labels(&label_taint.selector, &node) {
+                    continue;
+                }
+
+                let err = process_event_for_taint(&node_api, &node, &label_taint.taint).await;
+                if let Err(e) = err {
+                    error!("error processing event: {}", e);
+                }
             }
 
-            let err = process_event_for_taint(&node_api, &node, &label_taint.taint).await;
-            if let Err(e) = err {
-                error!("error processing event: {}", e);
-            }
+            next = stream.try_next().await;
         }
 
-        next = stream.try_next().await;
-    }
-
-    if let Err(e) = next {
-        error!("stream terminated with: {}", e);
+        if let Err(e) = next {
+            error!("stream terminated with: {}", e);
+        }
+        info!("watcher stream terminated, restarting in 10 seconds");
+        tokio::time::sleep(tokio::time::Duration::from_secs(10)).await;
     }
 }