Fix memory consumption again

pkg/connectors/icinga2/connector.go

@@ -200,6 +200,7 @@ func (c *Connector) get(endpoint string, ctx context.Context) (io.ReadCloser, er
 	if res.StatusCode >= 200 && res.StatusCode < 300 {
 		return res.Body, nil
 	}
+	defer res.Body.Close()
 
 	if ct := res.Header.Get("Content-Type"); ct == "application/json" {
 		e := struct {

pkg/web/common/server.go

@@ -34,7 +34,7 @@ func Serve(ctx context.Context, addr string, handler http.Handler) {
 		close(idleConnectionsClosed)
 	}()
 
-	slog.InfoContext(ctx, "Starting http server", slog.String("addr", addr))
+	slog.InfoContext(ctx, "Starting http server", slog.String("addr", "http://"+addr))
 
 	if err := srv.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
 		// Still try to start, application might still do useful work

pkg/web/static/js/index.js

@@ -2,8 +2,6 @@ import * as Turbo from '@hotwired/turbo';
 import ReconnectingWebSocket from 'reconnecting-websocket';
 import { toggleFilteredStatus } from "./toggle-filtered";
 
-toggleFilteredStatus();
-
 class SSEConn {
     constructor(socketUrl) {
         this.socketUrl = socketUrl;
@@ -70,7 +68,12 @@ class FallbackConn {
         let conn = this;
         this.timerId = setTimeout(function reload() {
             if (conn.active) {
-                let lastRefresh = Date.parse(document.querySelector("#last_refresh").dateTime);
+                let lastRefreshNode = document.querySelector("#last_refresh");
+                let lastRefresh = Date.now();
+                if (lastRefreshNode) {
+                    lastRefresh = Date.parse(lastRefreshNode.dateTime);
+                }
+
                 if (Date.now() - lastRefresh > 90000) {
                     console.log("Force reloading, last refresh too old: " + (Date.now() - lastRefresh))
                     location.reload();
@@ -127,6 +130,8 @@ fallback.connect();
 conn.connect();
 
 document.addEventListener("DOMContentLoaded", function () {
+    toggleFilteredStatus();
+
     console.log('Adding handler for manual disconnect.');
     const csEl = document.getElementById('connection-state');
     csEl.addEventListener("change", function () {

pkg/web/static/js/toggle-filtered.js

@@ -2,6 +2,10 @@ export function toggleFilteredStatus() {
     const toggleButton = document.getElementById("toggle-filtered-alerts");
     const filteredTable = document.getElementById("filtered-table");
 
+    if (!toggleButton) {
+        return;
+    }
+
     toggleButton.addEventListener("click", () => {
         filteredTable.classList.toggle("hidden");
         const filteredAreShown = !filteredTable.classList.contains("hidden");

pkg/web/web.go

@@ -306,9 +306,18 @@ func (h *WebHandler) wsRenderer(s *websocket.Conn, patterns ...string) wsRenderF
 		data.Environment = h.environment
 		data.Style = h.style
 
-		if err := tmpl.ExecuteTemplate(w, templateDefinition, data); err != nil {
+		// Note: we need to buffer the fully rendered template, it needs to be sent
+		// in one go to the frontend, otherwise Hotwire will not be able to piece
+		// it together.
+		buf := new(bytes.Buffer)
+
+		if err := tmpl.ExecuteTemplate(buf, templateDefinition, data); err != nil {
 			panic(errors.Join(TemplateError, err))
 		}
+
+		if _, err = w.Write(buf.Bytes()); err != nil {
+			panic(errors.Join(DisconnectError, err))
+		}
 	}
 }