fix(cleanup): prevent event listener and log stream leaks, tighten smartProxy connection timeouts, and improve graceful shutdown behavior

ts/classes.dcrouter.ts

@@ -476,6 +476,12 @@ export class DcRouter {
         ...this.options.smartProxyConfig,
         routes,
         acme: acmeConfig,
+        // Tighter connection timeouts to prevent connection buildup
+        socketTimeout: 300_000, // 5 min idle socket timeout
+        inactivityTimeout: 600_000, // 10 min inactivity timeout
+        keepAliveInactivityMultiplier: 3, // keep-alive idle = 30 min (10min * 3)
+        extendedKeepAliveLifetime: 3_600_000, // keep-alive connections live max 1 hour
+        maxConnectionLifetime: 14_400_000, // absolute max connection lifetime 4 hours
         certStore: {
           loadAll: async () => {
             const keys = await this.storageManager.list('/proxy-certs/');
@@ -903,6 +909,20 @@ export class DcRouter {
     await this.opsServer.stop();
 
     try {
+      // Remove event listeners before stopping services to prevent leaks
+      if (this.smartProxy) {
+        this.smartProxy.removeAllListeners();
+      }
+      if (this.emailServer) {
+        if ((this.emailServer as any).deliverySystem) {
+          (this.emailServer as any).deliverySystem.removeAllListeners();
+        }
+        this.emailServer.removeAllListeners();
+      }
+      if (this.dnsServer) {
+        this.dnsServer.removeAllListeners();
+      }
+
       // Stop all services in parallel for faster shutdown
       await Promise.all([
         // Stop cache cleaner if running
@@ -976,10 +996,11 @@ export class DcRouter {
   public async updateSmartProxyConfig(config: plugins.smartproxy.ISmartProxyOptions): Promise<void> {
     // Stop existing SmartProxy if running
     if (this.smartProxy) {
+      this.smartProxy.removeAllListeners();
       await this.smartProxy.stop();
       this.smartProxy = undefined;
     }
-    
+
     // Update configuration
     this.options.smartProxyConfig = config;
 
@@ -1103,6 +1124,11 @@ export class DcRouter {
     try {
       // Stop the unified email server which contains all components
       if (this.emailServer) {
+        // Remove listeners before stopping to prevent leaks on config update cycles
+        if ((this.emailServer as any).deliverySystem) {
+          (this.emailServer as any).deliverySystem.removeAllListeners();
+        }
+        this.emailServer.removeAllListeners();
         await this.emailServer.stop();
         logger.log('info', 'Unified email server stopped');
         this.emailServer = undefined;