1 files changed, 43 insertions, 0 deletions
diff --git a/services/docker/mail-server/relay/cron.ts b/services/docker/mail-server/relay/cron.ts
new file mode 100644
index 0000000..bf0a0be
--- /dev/null
+++ b/services/docker/mail-server/relay/cron.ts
@@ -0,0 +1,43 @@
+export type CronCallback = (task: CronTask) => Promise<void>;
+
+export interface CronTaskConfig {
+  readonly name: string;
+  readonly interval: number;
+  readonly callback: CronCallback;
+  readonly startNow?: boolean;
+}
+
+export class CronTask {
+  #timerTag: number | null = null;
+
+  constructor(public readonly config: CronTaskConfig) {
+    if (config.interval <= 0) {
+      throw new Error("Cron task interval must be positive.");
+    }
+
+    if (config.startNow === true) {
+      this.start();
+    }
+  }
+
+  get running(): boolean {
+    return this.#timerTag != null;
+  }
+
+  start() {
+    if (this.#timerTag == null) {
+      this.#timerTag = setInterval(
+        this.config.callback,
+        this.config.interval,
+        this,
+      );
+    }
+  }
+
+  stop() {
+    if (this.#timerTag != null) {
+      clearInterval(this.#timerTag);
+      this.#timerTag = null;
+    }
+  }
+}