perf: Health snapshot changes

electron/update/desktop-updater.ts

@@ -18,6 +18,11 @@ interface ReleaseManifestEntry {
   version: string;
 }
 
+interface ServerHealthResponse {
+  releaseManifestUrl?: string;
+  serverVersion?: string;
+}
+
 interface UpdateVersionInfo {
   version: string;
 }
@@ -53,6 +58,12 @@ export interface DesktopUpdateServerContext {
   serverVersionStatus: DesktopUpdateServerVersionStatus;
 }
 
+export interface DesktopUpdateServerHealthSnapshot {
+  manifestUrl: string | null;
+  serverVersion: string | null;
+  serverVersionStatus: DesktopUpdateServerVersionStatus;
+}
+
 export interface DesktopUpdateState {
   autoUpdateMode: AutoUpdateMode;
   availableVersions: string[];
@@ -78,6 +89,8 @@ export interface DesktopUpdateState {
 
 export const AUTO_UPDATE_STATE_CHANGED_CHANNEL = 'auto-update-state-changed';
 
+const SERVER_HEALTH_TIMEOUT_MS = 5_000;
+
 let currentCheckPromise: Promise<void> | null = null;
 let currentContext: DesktopUpdateServerContext = {
   manifestUrls: [],
@@ -388,6 +401,47 @@ async function loadReleaseManifest(manifestUrl: string): Promise<ReleaseManifest
   return parseReleaseManifest(payload);
 }
 
+function createUnavailableServerHealthSnapshot(): DesktopUpdateServerHealthSnapshot {
+  return {
+    manifestUrl: null,
+    serverVersion: null,
+    serverVersionStatus: 'unavailable'
+  };
+}
+
+async function loadServerHealth(serverUrl: string): Promise<DesktopUpdateServerHealthSnapshot> {
+  const sanitizedServerUrl = sanitizeHttpUrl(serverUrl);
+
+  if (!sanitizedServerUrl) {
+    return createUnavailableServerHealthSnapshot();
+  }
+
+  try {
+    const response = await net.fetch(`${sanitizedServerUrl}/api/health`, {
+      method: 'GET',
+      headers: {
+        accept: 'application/json'
+      },
+      signal: AbortSignal.timeout(SERVER_HEALTH_TIMEOUT_MS)
+    });
+
+    if (!response.ok) {
+      return createUnavailableServerHealthSnapshot();
+    }
+
+    const payload = await response.json() as ServerHealthResponse;
+    const serverVersion = normalizeSemanticVersion(payload.serverVersion);
+
+    return {
+      manifestUrl: sanitizeHttpUrl(payload.releaseManifestUrl),
+      serverVersion,
+      serverVersionStatus: serverVersion ? 'reported' : 'missing'
+    };
+  } catch {
+    return createUnavailableServerHealthSnapshot();
+  }
+}
+
 function formatManifestLoadErrors(errors: string[]): string {
   if (errors.length === 0) {
     return 'No valid release manifest could be loaded.';
@@ -724,6 +778,12 @@ export async function checkForDesktopUpdates(): Promise<DesktopUpdateState> {
   return desktopUpdateState;
 }
 
+export async function readDesktopUpdateServerHealth(
+  serverUrl: string
+): Promise<DesktopUpdateServerHealthSnapshot> {
+  return await loadServerHealth(serverUrl);
+}
+
 export function restartToApplyUpdate(): boolean {
   if (!desktopUpdateState.restartRequired) {
     return false;