@beenotung/tslib/net.js

utils library in Typescript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.findPort = findPort;
exports.testPort = testPort;
const net_1 = require("net");
/** @description find a port that is available for server port */
async function findPort(options) {
    if ('candidates' in options) {
        for (const port of options.candidates) {
            if (await testPort(port)) {
                return port;
            }
        }
        throw new Error('no port available');
    }
    for (let port = options.initialPort; port <= 65535; port += options.step) {
        if (await testPort(port)) {
            return port;
        }
    }
    throw new Error('no port available');
}
/** @description test if the port is available for server port */
function testPort(port) {
    return new Promise(resolve => {
        const server = (0, net_1.createServer)();
        server.on('error', () => resolve(false));
        server.listen(port, () => {
            server.close(error => {
                if (error) {
                    resolve(false);
                }
                else {
                    resolve(true);
                }
            });
        });
    });
}