feat(core): Unify application components shutdown (#8097)

## Summary

Add `ShutdownService` and `OnShutdown` decorator for more unified way to
shutdown different components. Use this new way in the following
components:

- HTTP(S) server
- Pruning service
- Push connection
- License

---------

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

packages/cli/src/commands/BaseCommand.ts

@@ -22,6 +22,7 @@ import { ExternalSecretsManager } from '@/ExternalSecrets/ExternalSecretsManager
 import { initExpressionEvaluator } from '@/ExpressionEvaluator';
 import { generateHostInstanceId } from '@db/utils/generators';
 import { WorkflowHistoryManager } from '@/workflows/workflowHistory/workflowHistoryManager.ee';
+import { ShutdownService } from '@/shutdown/Shutdown.service';
 
 export abstract class BaseCommand extends Command {
 	protected logger = Container.get(Logger);
@@ -38,7 +39,7 @@ export abstract class BaseCommand extends Command {
 
 	protected server?: AbstractServer;
 
-	protected isShuttingDown = false;
+	protected shutdownService: ShutdownService = Container.get(ShutdownService);
 
 	/**
 	 * How long to wait for graceful shutdown before force killing the process.
@@ -309,7 +310,7 @@ export abstract class BaseCommand extends Command {
 
 	private onTerminationSignal(signal: string) {
 		return async () => {
-			if (this.isShuttingDown) {
+			if (this.shutdownService.isShuttingDown()) {
 				this.logger.info(`Received ${signal}. Already shutting down...`);
 				return;
 			}
@@ -323,9 +324,9 @@ export abstract class BaseCommand extends Command {
 			}, this.gracefulShutdownTimeoutInS * 1000);
 
 			this.logger.info(`Received ${signal}. Shutting down...`);
-			this.isShuttingDown = true;
+			this.shutdownService.shutdown();
 
-			await this.stopProcess();
+			await Promise.all([this.stopProcess(), this.shutdownService.waitForShutdown()]);
 
 			clearTimeout(forceShutdownTimer);
 		};

packages/cli/src/commands/start.ts

@@ -63,7 +63,7 @@ export class Start extends BaseCommand {
 
 	protected activeWorkflowRunner: ActiveWorkflowRunner;
 
-	protected server = new Server();
+	protected server = Container.get(Server);
 
 	private pruningService: PruningService;
 
@@ -101,14 +101,6 @@ export class Start extends BaseCommand {
 
 			await this.externalHooks?.run('n8n.stop', []);
 
-			// Shut down License manager to unclaim any floating entitlements
-			// Note: While this saves a new license cert to DB, the previous entitlements are still kept in memory so that the shutdown process can complete
-			await Container.get(License).shutdown();
-
-			if (this.pruningService.isPruningEnabled()) {
-				this.pruningService.stopPruning();
-			}
-
 			if (Container.get(MultiMainSetup).isEnabled) {
 				await this.activeWorkflowRunner.removeAllTriggerAndPollerBasedWorkflows();
 

packages/cli/src/commands/webhook.ts

@@ -19,7 +19,7 @@ export class Webhook extends BaseCommand {
 		help: flags.help({ char: 'h' }),
 	};
 
-	protected server = new WebhookServer();
+	protected server = Container.get(WebhookServer);
 
 	constructor(argv: string[], cmdConfig: IConfig) {
 		super(argv, cmdConfig);