agora-rest-client/dist/agora/domain/resolver.js

Node.js REST client for Agora

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.bestDomain = void 0;
const promises_1 = require("dns/promises");
const log_1 = require("../log");
const utils_1 = require("../utils");
const types_1 = require("../types");
const logger = (0, log_1.getLogger)('RequestClient');
function bestDomain(domains, regionPrefix) {
    return new Promise((resolve, reject) => {
        let failCounter = 0;
        let domain;
        const resolver = new promises_1.Resolver({ timeout: 2000 });
        for (let i = 0; i < domains.length; i++) {
            const promise = resolver.resolve4(`${regionPrefix}.${domains[i]}`);
            promise
                .then((result) => {
                if (!domain) {
                    domain = domains[i];
                    resolve(domain);
                }
            })
                .catch((e) => {
                logger.error(`resolve "${domains[i]}" failed: ${e.code}`);
                failCounter++;
            })
                .finally(() => {
                if (failCounter === domains.length) {
                    reject(utils_1.GenericError.wrapMessage(utils_1.ERR_NAMESPACE_LIB, types_1.ErrorTypeEnum.RequestDNSError, 'DnsError', 'all dns failed'));
                }
            });
        }
    });
}
exports.bestDomain = bestDomain;