feat: add warning when chatbot enabled without a root agent id

Signed-off-by: SuZhou-Joe <[email protected]>

server/plugin.ts

@@ -16,6 +16,7 @@ import { setupRoutes } from './routes/index';
 import { AssistantPluginSetup, AssistantPluginStart, MessageParser } from './types';
 import { BasicInputOutputParser } from './parsers/basic_input_output_parser';
 import { VisualizationCardParser } from './parsers/visualization_card_parser';
+import { AgentIdNotFoundError } from './routes/chat_routes';
 
 export class AssistantPlugin implements Plugin<AssistantPluginSetup, AssistantPluginStart> {
   private readonly logger: Logger;
@@ -31,6 +32,15 @@ export class AssistantPlugin implements Plugin<AssistantPluginSetup, AssistantPl
       .create<AssistantConfig>()
       .pipe(first())
       .toPromise();
+
+    /**
+     * Check if user enable the chat without specifying a root agent id.
+     * If so, gives a warning for guidance.
+     */
+    if (config.chat.enabled && !config.chat.rootAgentId) {
+      this.logger.warn(AgentIdNotFoundError);
+    }
+
     const router = core.http.createRouter();
 
     core.http.registerRouteHandlerContext('assistant_plugin', () => {