@lodestar/utils/lib/retry.js

Utilities required across multiple lodestar packages

import { ErrorAborted } from "./errors.js";
import { sleep } from "./sleep.js";
/**
 * Retry a given function on error.
 * @param fn Async callback to retry. Invoked with 1 parameter
 * A Number identifying the attempt. The absolute first attempt (before any retries) is 1
 * @param opts
 */
export async function retry(fn, opts) {
    const maxRetries = opts?.retries ?? 5;
    // Number of retries + the initial attempt
    const maxAttempts = maxRetries + 1;
    const shouldRetry = opts?.shouldRetry;
    const onRetry = opts?.onRetry;
    let lastError = Error("RetryError");
    for (let i = 1; i <= maxAttempts; i++) {
        // If not the first attempt
        if (i > 1) {
            if (opts?.signal?.aborted) {
                throw new ErrorAborted("retry");
            }
            // Invoke right before retrying
            onRetry?.(lastError, i);
        }
        try {
            return await fn(i);
        }
        catch (e) {
            lastError = e;
            if (i === maxAttempts) {
                // Reached maximum number of attempts, there's no need to check if we should retry
                break;
            }
            if (shouldRetry && !shouldRetry(lastError)) {
                break;
            }
            if (opts?.retryDelay !== undefined) {
                await sleep(opts?.retryDelay, opts?.signal);
            }
        }
    }
    throw lastError;
}
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