add inbound activity logger for debugging

packages/backend/src/daemons/ActivityLogCleanupService.ts

@@ -0,0 +1,64 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable, type OnApplicationShutdown } from '@nestjs/common';
+import { LessThan } from 'typeorm';
+import { DI } from '@/di-symbols.js';
+import type { Config } from '@/config.js';
+import { bindThis } from '@/decorators.js';
+import type { ActivityLogsRepository } from '@/models/_.js';
+
+// 10 minutes
+export const scanInterval = 1000 * 60 * 10;
+
+@Injectable()
+export class ActivityLogCleanupService implements OnApplicationShutdown {
+	private scanTimer: NodeJS.Timeout | null = null;
+
+	constructor(
+		@Inject(DI.config)
+		private readonly config: Config,
+
+		@Inject(DI.activityLogsRepository)
+		private readonly activityLogsRepository: ActivityLogsRepository,
+	) {}
+
+	@bindThis
+	public async start(): Promise<void> {
+		// Just in case start() gets called multiple times.
+		this.dispose();
+
+		// Prune at startup, in case the server was rebooted during the interval.
+		// noinspection ES6MissingAwait
+		this.tick();
+
+		// Prune on a regular interval for the lifetime of the server.
+		this.scanTimer = setInterval(this.tick, scanInterval);
+	}
+
+	@bindThis
+	private async tick(): Promise<void> {
+		// This is the date in UTC of the oldest log to KEEP
+		const oldestAllowed = new Date(Date.now() - this.config.activityLogging.maxAge);
+
+		// Delete all logs older than the threshold.
+		await this.activityLogsRepository.delete({
+			at: LessThan(oldestAllowed),
+		});
+	}
+
+	@bindThis
+	public onApplicationShutdown(): void {
+		this.dispose();
+	}
+
+	@bindThis
+	public dispose(): void {
+		if (this.scanTimer) {
+			clearInterval(this.scanTimer);
+			this.scanTimer = null;
+		}
+	}
+}