Exponential backoff retry strategy for async

rejection-based-retry.ts

// General purpose Rejection-based retrying
// Source: https://advancedweb.hu/how-to-implement-an-exponential-backoff-retry-strategy-in-javascript/

const wait = (ms) => new Promise((res) => setTimeout(res, ms));
const maybeFail = (successProbability, result, error) => new Promise((res, rej) => Math.random() < successProbability ? res(result) : rej());

const maybeFailingOperation = async () => {
	await wait(10);
	return maybeFail(0.1, "result", "error");
}

const callWithRetry = async (fn, depth = 0) => {
	try {
		return await fn();
	}catch(e) {
		if (depth > 7) {
			throw e;
		}
		await wait(2 ** depth * 10);
	
		return callWithRetry(fn, depth + 1);
	}
}

const result = await callWithRetry(maybeFailingOperation);