undici-retry/dist/lib/retryAfterResolver.js

Library for handling retry logic with undici HTTP client

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.resolveDelayTime = resolveDelayTime;
const DIGITS_ONLY_REGEX = /^\d+$/;
function resolveDelayTime(headers, maxDelay = 60000) {
    const retryAfter = headers['retry-after'];
    if (!retryAfter) {
        return {
            error: 'header_not_set',
        };
    }
    let resolvedDelay;
    // parse as number
    if (retryAfter.match(DIGITS_ONLY_REGEX)) {
        resolvedDelay = Number.parseInt(retryAfter) * 1000;
    }
    // parse as date
    else {
        const date = new Date(retryAfter);
        if (!isNaN(date.getTime())) {
            resolvedDelay = date.getTime() - Date.now();
        }
    }
    if (resolvedDelay) {
        return resolvedDelay <= maxDelay
            ? {
                result: resolvedDelay,
            }
            : {
                error: 'max_delay_exceeded',
            };
    }
    return {
        error: 'unknown_format',
    };
}
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