feat(server): emit query events with questions, answered status, response time and timestamp

ts_server/classes.dnsserver.ts

@@ -1,5 +1,5 @@
 import * as plugins from './plugins.js';
-import { RustDnsBridge, type IDnsQueryEvent, type IIpcDnsAnswer, type IRustDnsConfig } from './classes.rustdnsbridge.js';
+import { RustDnsBridge, type IDnsQueryEvent, type IIpcDnsAnswer, type IIpcDnsQuestion, type IRustDnsConfig } from './classes.rustdnsbridge.js';
 
 export interface IDnsServerOptions {
   httpsKey: string;
@@ -45,7 +45,18 @@ interface LetsEncryptOptions {
   certDir?: string;
 }
 
-export class DnsServer {
+export interface IDnsQueryCompletedEvent {
+  /** The original questions from the query */
+  questions: IIpcDnsQuestion[];
+  /** Whether any handler answered the query */
+  answered: boolean;
+  /** How long handler resolution took (ms) */
+  responseTimeMs: number;
+  /** Timestamp of the query */
+  timestamp: number;
+}
+
+export class DnsServer extends plugins.events.EventEmitter {
   private bridge: RustDnsBridge;
   private handlers: IDnsHandler[] = [];
 
@@ -57,12 +68,21 @@ export class DnsServer {
   private udpServer: any = null;
 
   constructor(private options: IDnsServerOptions) {
+    super();
     this.bridge = new RustDnsBridge();
 
     // Wire up the dnsQuery event to run TypeScript handlers
     this.bridge.on('dnsQuery', async (event: IDnsQueryEvent) => {
       try {
+        const startTime = Date.now();
         const answers = this.resolveQuery(event);
+        const responseTimeMs = Date.now() - startTime;
+        this.emit('query', {
+          questions: event.questions,
+          answered: answers.answered,
+          responseTimeMs,
+          timestamp: startTime,
+        } satisfies IDnsQueryCompletedEvent);
         await this.bridge.sendQueryResult(
           event.correlationId,
           answers.answers,