Implement waitForCertificates helper with polling, back-off, timeout, and abort support

src/lib/utils/asleep.ts

@@ -0,0 +1,38 @@
+/**
+ * Asynchronously sleep for a specified duration with optional abort signal support.
+ *
+ * @param ms - The duration to sleep in milliseconds
+ * @param signal - Optional AbortSignal to cancel the sleep operation
+ * @returns A promise that resolves after the specified duration or rejects if aborted
+ * @throws Error if the operation is aborted via the signal
+ *
+ * @remarks
+ * This function should be replaced when the `@keetanetwork/keetanet-client`
+ * `KeetaNet.lib.Utils.Helper.asleep` method is updated to support `AbortSignal`.
+ */
+export function asleep(ms: number, signal?: AbortSignal): Promise<void> {
+	return(new Promise<void>((resolve, reject) => {
+		let abortHandler: (() => void) | undefined;
+
+		// Check if already aborted
+		if (signal?.aborted) {
+			reject(new Error('Sleep aborted'));
+			return;
+		}
+
+		const timeout = setTimeout(() => {
+			if (abortHandler) {
+				signal?.removeEventListener('abort', abortHandler);
+			}
+			resolve();
+		}, ms);
+
+		if (signal) {
+			abortHandler = () => {
+				clearTimeout(timeout);
+				reject(new Error('Sleep aborted'));
+			};
+			signal.addEventListener('abort', abortHandler, { once: true });
+		}
+	}));
+}