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134 lines
3.5 KiB
134 lines
3.5 KiB
"use strict";
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/*
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* Based on the packages get-port https://www.npmjs.com/package/get-port
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* and portfinder https://www.npmjs.com/package/portfinder
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* The code structure is similar to get-port, but it searches
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* ports deterministically like portfinder
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*/
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const net = require("net");
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const os = require("os");
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const minPort = 1024;
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const maxPort = 65_535;
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/**
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* @return {Set<string|undefined>}
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*/
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const getLocalHosts = () => {
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const interfaces = os.networkInterfaces();
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// Add undefined value for createServer function to use default host,
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// and default IPv4 host in case createServer defaults to IPv6.
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// eslint-disable-next-line no-undefined
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const results = new Set([undefined, "0.0.0.0"]);
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for (const _interface of Object.values(interfaces)) {
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if (_interface) {
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for (const config of _interface) {
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results.add(config.address);
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}
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}
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}
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return results;
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};
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/**
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* @param {number} basePort
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* @param {string | undefined} host
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* @return {Promise<number>}
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*/
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const checkAvailablePort = (basePort, host) =>
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new Promise((resolve, reject) => {
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const server = net.createServer();
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server.unref();
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server.on("error", reject);
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server.listen(basePort, host, () => {
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// Next line should return AdressInfo because we're calling it after listen() and before close()
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const { port } = /** @type {import("net").AddressInfo} */ (
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server.address()
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);
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server.close(() => {
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resolve(port);
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});
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});
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});
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/**
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* @param {number} port
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* @param {Set<string|undefined>} hosts
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* @return {Promise<number>}
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*/
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const getAvailablePort = async (port, hosts) => {
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/**
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* Errors that mean that host is not available.
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* @type {Set<string | undefined>}
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*/
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const nonExistentInterfaceErrors = new Set(["EADDRNOTAVAIL", "EINVAL"]);
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/* Check if the post is available on every local host name */
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for (const host of hosts) {
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try {
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await checkAvailablePort(port, host); // eslint-disable-line no-await-in-loop
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} catch (error) {
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/* We throw an error only if the interface exists */
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if (
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!nonExistentInterfaceErrors.has(
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/** @type {NodeJS.ErrnoException} */ (error).code
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)
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) {
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throw error;
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}
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}
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}
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return port;
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};
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/**
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* @param {number} basePort
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* @param {string=} host
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* @return {Promise<number>}
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*/
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async function getPorts(basePort, host) {
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if (basePort < minPort || basePort > maxPort) {
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throw new Error(`Port number must lie between ${minPort} and ${maxPort}`);
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}
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let port = basePort;
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const localhosts = getLocalHosts();
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let hosts;
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if (host && !localhosts.has(host)) {
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hosts = new Set([host]);
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} else {
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/* If the host is equivalent to localhost
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we need to check every equivalent host
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else the port might falsely appear as available
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on some operating systems */
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hosts = localhosts;
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}
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/** @type {Set<string | undefined>} */
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const portUnavailableErrors = new Set(["EADDRINUSE", "EACCES"]);
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while (port <= maxPort) {
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try {
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const availablePort = await getAvailablePort(port, hosts); // eslint-disable-line no-await-in-loop
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return availablePort;
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} catch (error) {
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/* Try next port if port is busy; throw for any other error */
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if (
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!portUnavailableErrors.has(
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/** @type {NodeJS.ErrnoException} */ (error).code
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)
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) {
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throw error;
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}
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port += 1;
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}
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}
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throw new Error("No available ports found");
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}
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module.exports = getPorts;
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