js 里面咋 ping

// syscall.js

const util = require('util');
const exec = util.promisify(require('child_process').exec);

export const ping = (event, target) => {
    const ipv4Pattern = /((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})(\.((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})){3}/;  // IPv4
    const domainNamePattern = /[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+\.?/;       // 域名

    if ((!ipv4Pattern.test(target)) && (!domainNamePattern.test(target))) {
        return Promise.reject(new Error(
            target.toString() + ' is neither a valid IPv4 address nor a valid domain name.'
        ));
    }

    return exec('ping ' + target);
};

// syscall.test.js

import { ping } from "../../utils/syscall";

describe('Syscall', () => {
    it.concurrent('ping valid ip success', async () => {
        await ping(undefined, '127.0.0.1')
            .then((stdout, stderr) => {
                expect(stderr).toBeUndefined();
                expect(stdout).toBeDefined();
            })
            .catch(() => {
                expect(false).toBe(true);
            });
    });
});