@forivall/wyt/dist/index.js

A time-based rate limiter using promises

"use strict";
function sleep(ms) {
    return new Promise((resolve) => {
        setTimeout(() => resolve(), ms);
    });
}
function reload(requestsPerInterval, interval, state) {
    const throughput = requestsPerInterval / interval;
    const now = Date.now();
    const reloadTime = now - state.lastReload;
    const reloadedRequests = reloadTime * throughput;
    const newAvalableRequests = state.availableRequests + reloadedRequests;
    return {
        ...state,
        lastReload: now,
        availableRequests: Math.min(newAvalableRequests, requestsPerInterval),
    };
}
module.exports = function wyt(requestsPerInterval, interval) {
    const timePerRequest = interval / requestsPerInterval;
    let state = {
        lastReload: Date.now(),
        availableRequests: requestsPerInterval,
    };
    async function waitRequest(requests = 1) {
        if (requests > requestsPerInterval) {
            throw new Error('Requests can not be greater than the number of requests per interval');
        }
        state = reload(requestsPerInterval, interval, state);
        const requestsToWait = Math.max(0, requests - state.availableRequests);
        const wait = Math.ceil(requestsToWait * timePerRequest);
        state.availableRequests -= requests;
        await sleep(wait);
        return wait;
    }
    return waitRequest;
};
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