@scaleway/sdk-client
Version:
Scaleway SDK Client
54 lines (53 loc) • 1.83 kB
JavaScript
;
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const sleep = require("./sleep.cjs");
const DEFAULT_TIMEOUT_SECONDS = 300;
const DEFAULT_MIN_DELAY_SECONDS = 1;
const DEFAULT_MAX_DELAY_SECONDS = 30;
function* createExponentialBackoffStrategy(minDelay, maxDelay) {
if (minDelay < 1 || maxDelay < 1 || minDelay > maxDelay) {
throw new Error(
"Waiter: minDelay must be >= 1 and maxDelay must be >= minDelay"
);
}
let attempt = 1;
const ceiling = Math.log(maxDelay / minDelay) / Math.log(2) + 1;
const randomInRange = (min, max) => min + Math.random() * (max - min);
while (true) {
if (attempt > ceiling) {
yield maxDelay;
} else {
yield randomInRange(minDelay, minDelay * 2 ** (attempt - 1));
}
attempt += 1;
}
}
const tryAtIntervals = async (retry, strategy, timeout = DEFAULT_TIMEOUT_SECONDS) => {
const timeoutTimestamp = Date.now() + timeout * 1e3;
let retryCount = 0;
while (Date.now() <= timeoutTimestamp) {
const delay = strategy.next(retryCount += 1).value * 1e3;
if (timeoutTimestamp <= Date.now() + delay) break;
await sleep.sleep(delay);
const { value, done } = await retry();
if (done) return value;
}
throw new Error(`Timeout after ${timeout}s`);
};
const waitForResource = (stop, fetcher, request, options, strategy = createExponentialBackoffStrategy(
options?.minDelay ?? DEFAULT_MIN_DELAY_SECONDS,
options?.maxDelay ?? DEFAULT_MAX_DELAY_SECONDS
)) => tryAtIntervals(
async () => {
const value = await fetcher(request);
return {
done: await stop(value),
value
};
},
strategy,
options?.timeout
);
exports.createExponentialBackoffStrategy = createExponentialBackoffStrategy;
exports.tryAtIntervals = tryAtIntervals;
exports.waitForResource = waitForResource;