fix: prevent extension from hanging when embedder service is unavailable

- Made CodeIndexManager initialization non-blocking during extension activation
- Added 5-second timeout to embedder validation to prevent indefinite hanging
- Extension now loads successfully even if embedder service is missing

Fixes #8777

Author: roomote

src/extension.ts

@@ -100,6 +100,7 @@ export async function activate(context: vscode.ExtensionContext) {
 	const contextProxy = await ContextProxy.getInstance(context)
 
 	// Initialize code index managers for all workspace folders.
+	// Make initialization non-blocking to prevent extension activation from hanging
 	const codeIndexManagers: CodeIndexManager[] = []
 
 	if (vscode.workspace.workspaceFolders) {
@@ -108,16 +109,15 @@ export async function activate(context: vscode.ExtensionContext) {
 
 			if (manager) {
 				codeIndexManagers.push(manager)
+				context.subscriptions.push(manager)
 
-				try {
-					await manager.initialize(contextProxy)
-				} catch (error) {
+				// Initialize in the background without blocking extension activation
+				// This prevents the extension from getting stuck if the embedder service is unavailable
+				manager.initialize(contextProxy).catch((error) => {
 					outputChannel.appendLine(
 						`[CodeIndexManager] Error during background CodeIndexManager configuration/indexing for ${folder.uri.fsPath}: ${error.message || error}`,
 					)
-				}
-
-				context.subscriptions.push(manager)
+				})
 			}
 		}
 	}

src/services/code-index/service-factory.ts

@@ -93,7 +93,23 @@ export class CodeIndexServiceFactory {
 	 */
 	public async validateEmbedder(embedder: IEmbedder): Promise<{ valid: boolean; error?: string }> {
 		try {
-			return await embedder.validateConfiguration()
+			// Add a timeout to prevent hanging when the embedder service is unavailable
+			const VALIDATION_TIMEOUT_MS = 5000 // 5 seconds timeout
+
+			const timeoutPromise = new Promise<{ valid: boolean; error: string }>((_, reject) => {
+				setTimeout(() => {
+					reject(
+						new Error(
+							"Failed to connect to the embedder service. Please check your connection settings and ensure the service is running.",
+						),
+					)
+				}, VALIDATION_TIMEOUT_MS)
+			})
+
+			const validationPromise = embedder.validateConfiguration()
+
+			// Race between validation and timeout
+			return await Promise.race([validationPromise, timeoutPromise])
 		} catch (error) {
 			// Capture telemetry for the error
 			TelemetryService.instance.captureEvent(TelemetryEventName.CODE_INDEX_ERROR, {