feat: implement object caching mechanism and enhance status filter options

crates/aetheris-app/src/app.rs

@@ -1,5 +1,5 @@
 use std::{
-    collections::{BTreeSet, HashMap},
+    collections::{BTreeSet, HashMap, VecDeque},
     fs,
     path::PathBuf,
 };
@@ -56,6 +56,7 @@ const OBJECT_API_WIDTH: i32 = 96;
 const OBJECT_AGE_WIDTH: i32 = 56;
 const OBJECT_COLUMN_MIN_WIDTH: i32 = 48;
 const OBJECT_NAME_MIN_WIDTH: i32 = 160;
+const OBJECT_CACHE_LIMIT: usize = 20;
 
 #[derive(Debug, Clone)]
 pub(super) enum ClusterSummaryState {
@@ -180,6 +181,8 @@ pub struct App {
     object_sorted: gtk::SortListModel,
     object_columns: Vec<(ObjectTableColumn, gtk::ColumnViewColumn)>,
     object_list_stack: gtk::Stack,
+    object_cache: HashMap<ObjectCacheKey, Vec<ObjectSummary>>,
+    object_cache_order: VecDeque<ObjectCacheKey>,
     detail: DetailPane,
     object_load_token: u64,
     object_watch_token: u64,
@@ -221,6 +224,16 @@ pub struct App {
     renaming_namespace: Option<String>,
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+struct ObjectCacheKey {
+    context: String,
+    group: String,
+    version: String,
+    kind: String,
+    plural: String,
+    namespace: Option<String>,
+}
+
 #[cfg(not(target_os = "windows"))]
 struct TerminalSession {
     window: adw::Window,

crates/aetheris-app/src/app/commands.rs

@@ -4,6 +4,7 @@ use super::utils::*;
 use super::*;
 
 const CLUSTER_LOAD_TIMEOUT: Duration = Duration::from_secs(30);
+const OBJECT_LIST_TIMEOUT: Duration = Duration::from_secs(30);
 
 pub(super) async fn load_state() -> AppMsg {
     let result = async {
@@ -89,7 +90,17 @@ pub(super) async fn list_objects(
     resource: ResourceKind,
     namespace: Option<String>,
 ) -> AppMsg {
-    let result = list_objects_snapshot(context, resource, namespace).await;
+    let result = match tokio::time::timeout(
+        OBJECT_LIST_TIMEOUT,
+        list_objects_snapshot(context, resource, namespace),
+    )
+    .await
+    {
+        Ok(result) => result,
+        Err(_) => Err(String::from(
+            "Timed out while listing objects for the selected resource. Check that the API server is reachable and try again.",
+        )),
+    };
 
     AppMsg::ObjectsLoaded(token, result)
 }

crates/aetheris-app/src/app/component.rs

@@ -942,6 +942,8 @@ impl Component for App {
             object_sorted,
             object_columns,
             object_list_stack,
+            object_cache: HashMap::new(),
+            object_cache_order: VecDeque::new(),
             detail: DetailPane {
                 back_button: detail_back_button,
                 stack: detail_stack,

crates/aetheris-app/src/app/handler.rs

@@ -686,6 +686,7 @@ impl App {
             }
             AppMsg::ObjectCreated(Ok(name)) => {
                 self.loading = false;
+                self.clear_object_cache();
                 self.create_yaml_dialog.close();
                 self.create_yaml_buffer.set_text("");
                 self.toaster.add_toast(adw::Toast::new(&tr_format(
@@ -722,6 +723,7 @@ impl App {
                     return;
                 }
                 self.loading = false;
+                self.clear_object_cache();
                 self.status = tr_format("Scaled {name}", &[("{name}", detail.name.clone())]);
                 self.populate_detail_dialog(&detail);
                 self.update_log_target_containers(&detail);
@@ -761,6 +763,7 @@ impl App {
                     return;
                 }
                 self.loading = false;
+                self.clear_object_cache();
                 self.status = tr_format("Updated {name}", &[("{name}", detail.name.clone())]);
                 self.populate_detail_dialog(&detail);
                 self.update_log_target_containers(&detail);
@@ -822,6 +825,7 @@ impl App {
                     return;
                 }
                 self.loading = false;
+                self.clear_object_cache();
                 self.status = tr_format("Drained {name}", &[("{name}", detail.name.clone())]);
                 self.populate_detail_dialog(&detail);
                 self.update_log_target_containers(&detail);
@@ -861,6 +865,7 @@ impl App {
                     return;
                 }
                 self.loading = false;
+                self.clear_object_cache();
                 self.status = tr_format("Applied {name}", &[("{name}", detail.name.clone())]);
                 self.populate_detail_dialog(&detail);
                 self.update_log_target_containers(&detail);
@@ -1014,6 +1019,7 @@ impl App {
                     return;
                 }
                 self.loading = false;
+                self.clear_object_cache();
                 self.detail.target = None;
                 self.detail.log_target = None;
                 self.detail.exec_target = None;
@@ -1162,6 +1168,7 @@ impl App {
                 self.loading = false;
                 let count = objects.len();
                 self.objects = objects;
+                self.cache_current_objects();
                 self.set_object_status(count);
                 self.sync_status();
                 self.rebuild_object_list();
@@ -1173,7 +1180,14 @@ impl App {
                 }
                 self.loading = false;
                 self.stop_object_watch();
-                self.objects.clear();
+                if let Some(objects) = self
+                    .current_object_cache_key()
+                    .and_then(|key| self.cached_objects(&key))
+                {
+                    self.objects = objects;
+                } else {
+                    self.objects.clear();
+                }
                 self.status = tr("Unable to list selected resource.");
                 self.sync_status();
                 self.rebuild_object_list();
@@ -1186,14 +1200,17 @@ impl App {
                 match event {
                     ObjectWatchEvent::Restarted(objects) => {
                         self.objects = objects;
+                        self.cache_current_objects();
                         self.schedule_object_list_refresh(&sender);
                     }
                     ObjectWatchEvent::Applied(object) => {
                         self.upsert_object(object);
+                        self.cache_current_objects();
                         self.schedule_object_list_refresh(&sender);
                     }
                     ObjectWatchEvent::Deleted(object) => {
                         self.remove_object(&object);
+                        self.cache_current_objects();
                         self.schedule_object_list_refresh(&sender);
                     }
                     ObjectWatchEvent::Error(error) => {

crates/aetheris-app/src/app/methods.rs

@@ -232,6 +232,8 @@ impl App {
         self.stop_object_watch();
         self.stop_log_stream();
         self.stop_port_forward();
+        self.object_cache.clear();
+        self.object_cache_order.clear();
         self.detail.exec_target = None;
         self.detail.port_forward_target = None;
         self.loading = true;
@@ -275,9 +277,20 @@ impl App {
         self.stop_object_watch();
         self.object_load_token = self.object_load_token.saturating_add(1);
         let token = self.object_load_token;
+        let cache_key = object_cache_key(&context, &resource, namespace.clone());
         self.loading = true;
-        self.objects.clear();
-        self.status = tr_format("Loading {resource}...", &[("{resource}", resource.label())]);
+        if let Some(objects) = self.cached_objects(&cache_key) {
+            let count = objects.len();
+            self.objects = objects;
+            self.set_object_status(count);
+            self.status = tr_format(
+                "Refreshing {resource}...",
+                &[("{resource}", resource.label())],
+            );
+        } else {
+            self.objects.clear();
+            self.status = tr_format("Loading {resource}...", &[("{resource}", resource.label())]);
+        }
         self.sync_status();
         self.rebuild_object_list();
         sender.oneshot_command(
@@ -682,6 +695,47 @@ impl App {
             .splice(0, self.object_store.n_items(), &items);
     }
 
+    pub(super) fn current_object_cache_key(&self) -> Option<ObjectCacheKey> {
+        let context = self.selected_context.as_ref()?;
+        let resource = self.selected_resource_kind()?;
+        let namespace = resource
+            .is_namespaced()
+            .then(|| self.selected_namespace.clone());
+        Some(object_cache_key(context, resource, namespace))
+    }
+
+    pub(super) fn cached_objects(&mut self, key: &ObjectCacheKey) -> Option<Vec<ObjectSummary>> {
+        let objects = self.object_cache.get(key)?.clone();
+        self.touch_object_cache_key(key.clone());
+        Some(objects)
+    }
+
+    pub(super) fn cache_current_objects(&mut self) {
+        if let Some(key) = self.current_object_cache_key() {
+            self.cache_objects(key, self.objects.clone());
+        }
+    }
+
+    pub(super) fn cache_objects(&mut self, key: ObjectCacheKey, objects: Vec<ObjectSummary>) {
+        self.object_cache.insert(key.clone(), objects);
+        self.touch_object_cache_key(key);
+        while self.object_cache_order.len() > OBJECT_CACHE_LIMIT {
+            if let Some(oldest) = self.object_cache_order.pop_front() {
+                self.object_cache.remove(&oldest);
+            }
+        }
+    }
+
+    pub(super) fn touch_object_cache_key(&mut self, key: ObjectCacheKey) {
+        self.object_cache_order.retain(|existing| existing != &key);
+        self.object_cache_order.push_back(key);
+    }
+
+    pub(super) fn clear_object_cache(&mut self) {
+        self.object_cache.clear();
+        self.object_cache_order.clear();
+    }
+
     /// Merges one watch event into `objects` without sorting or repainting;
     /// both are deferred to `flush_object_list_refresh` so an event burst
     /// costs one refresh instead of thousands.
@@ -941,6 +995,21 @@ impl App {
     }
 }
 
+fn object_cache_key(
+    context: &str,
+    resource: &ResourceKind,
+    namespace: Option<String>,
+) -> ObjectCacheKey {
+    ObjectCacheKey {
+        context: context.to_owned(),
+        group: resource.group.clone(),
+        version: resource.version.clone(),
+        kind: resource.kind.clone(),
+        plural: resource.plural.clone(),
+        namespace,
+    }
+}
+
 /// The object at a view position, resolved against the sorted model the
 /// `ColumnView` actually displays (positions differ from the backing store
 /// whenever a header-click sort is active).

crates/aetheris-app/src/app/projects.rs

@@ -68,6 +68,7 @@ pub(crate) enum ResourceSection {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub(super) enum StatusFilter {
     Ready,
+    Available,
     Unavailable,
     Running,
     Pending,
@@ -198,8 +199,9 @@ pub(super) fn default_object_columns() -> Vec<ObjectColumn> {
 const OBJECT_COLUMN_SCHEMA_VERSION: u32 = 1;
 
 impl StatusFilter {
-    pub(super) const ALL: [Self; 5] = [
+    pub(super) const ALL: [Self; 6] = [
         Self::Ready,
+        Self::Available,
         Self::Unavailable,
         Self::Running,
         Self::Pending,
@@ -209,6 +211,7 @@ impl StatusFilter {
     pub(super) fn label(self) -> String {
         match self {
             Self::Ready => tr("Ready"),
+            Self::Available => tr("Available"),
             Self::Unavailable => tr("Unavailable"),
             Self::Running => tr("Running"),
             Self::Pending => tr("Pending"),
@@ -237,6 +240,7 @@ impl StatusFilter {
     pub(super) fn keyword(self) -> &'static str {
         match self {
             Self::Ready => "Ready",
+            Self::Available => "Available",
             Self::Unavailable => "Unavailable",
             Self::Running => "Running",
             Self::Pending => "Pending",

crates/aetheris-app/src/app/widgets.rs

@@ -295,7 +295,7 @@ fn filter_chip(
 
 fn status_filter_tone(filter: StatusFilter) -> StatusTone {
     match filter {
-        StatusFilter::Ready | StatusFilter::Running => StatusTone::Good,
+        StatusFilter::Ready | StatusFilter::Available | StatusFilter::Running => StatusTone::Good,
         StatusFilter::Pending | StatusFilter::Unavailable => StatusTone::Warning,
         StatusFilter::Failed => StatusTone::Bad,
     }