Initial move

backend/src/utils/multer.ts

@@ -0,0 +1,4 @@
+import multer from "multer";
+import { UPLOAD_DIR } from "../config";
+
+export const upload = multer({ dest: UPLOAD_DIR });

backend/src/utils/scheduler.ts

@@ -0,0 +1,54 @@
+export enum TimeUnit {
+    SECOND = 1000,
+    MINUTE = 60 * 1000,
+    HOUR = 60 * 60 * 1000,
+    DAY = 24 * 60 * 60 * 1000,
+    WEEK = 7 * 24 * 60 * 60 * 1000
+}
+
+export type Task = () => void;
+
+export interface TaskEntry {
+    id: Timer;
+    task: Task;
+    remainingRuns: number;
+}
+
+export class Scheduler {
+    private tasks: Map<string, TaskEntry> = new Map();
+
+    static toMilliseconds(time: number, unit: TimeUnit): number {
+        return time * unit;
+    }
+
+    register(taskName: string, task: Task, delay: number, unit: TimeUnit, runs: number = Infinity): void {
+        if (this.tasks.has(taskName)) {
+            throw new Error(`Task ${taskName} is already registered.`);
+        }
+        const performTask = () => {
+            task();
+            const taskEntry = this.tasks.get(taskName);
+            if (taskEntry) {
+                taskEntry.remainingRuns--;
+                if (taskEntry.remainingRuns > 0) {
+                    taskEntry.id = setTimeout(performTask, Scheduler.toMilliseconds(delay, unit));
+                } else {
+                    this.tasks.delete(taskName);
+                }
+            }
+        };
+        this.tasks.set(taskName, { id: setTimeout(performTask, Scheduler.toMilliseconds(delay, unit)), task, remainingRuns: runs });
+    }
+
+    unregister(taskName: string): void {
+        const taskEntry = this.tasks.get(taskName);
+        if (taskEntry) {
+            clearTimeout(taskEntry.id);
+            this.tasks.delete(taskName);
+        }
+    }
+
+    getTasks(): Map<string, TaskEntry> {
+        return this.tasks;
+    }
+}