@azure/core-amqp/dist/esm/util/checkNetworkConnection.js

Common library for amqp based azure sdks like @azure/event-hubs.

// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
import { CONNREFUSED, TIMEOUT, resolve as dnsResolve } from "node:dns";
import { logger } from "../log.js";
/**
 * Checks whether a network connection is detected.
 * @internal
 */
export function checkNetworkConnection(host) {
    return new Promise((resolve) => {
        logger.verbose("Calling dns.resolve to determine network connection status.");
        dnsResolve(host, function (err) {
            if (err) {
                logger.verbose("Error thrown from dns.resolve in network connection check: '%s', %O", err.code || err.name, err);
                // List of possible DNS error codes: https://nodejs.org/dist/latest-v12.x/docs/api/dns.html#dns_error_codes
                // We only resolve with `false` when dnsResolve fails with an error we expect to see when the network is down.
                if (err.code === CONNREFUSED || err.code === TIMEOUT) {
                    return resolve(false);
                }
            }
            else {
                logger.verbose("Successfully resolved host via dns.resolve in network connection check.");
            }
            return resolve(true);
        });
    });
}
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