masto/dist/esm/utils/exponential-backoff.js

Mastodon API client for JavaScript, TypeScript, Node.js, browsers

import { CustomError } from "ts-custom-error";
import { sleep } from "./sleep.js";
export class ExponentialBackoffError extends CustomError {
    constructor(attempts, options) {
        super(`Maximum number of attempts reached: ${attempts}`, options);
    }
}
// https://en.wikipedia.org/wiki/Exponential_backoff
export class ExponentialBackoff {
    props;
    attempts = 0;
    constructor(props = {}) {
        this.props = props;
    }
    async sleep() {
        if (this.attempts >= this.maxAttempts) {
            throw new ExponentialBackoffError(this.attempts);
        }
        await sleep(this.timeout);
        this.attempts++;
    }
    clear() {
        this.attempts = 0;
    }
    get factor() {
        return this.props.factor ?? 1000;
    }
    get base() {
        return this.props.base ?? 2;
    }
    get maxAttempts() {
        return this.props.maxAttempts ?? Number.POSITIVE_INFINITY;
    }
    get timeout() {
        return this.factor * this.base ** this.attempts;
    }
}