@pact-foundation/pact/src/common/net.js

Pact for all things Javascript

"use strict";
/**
 * Network module.
 * @module net
 * @private
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.freePort = exports.isPortAvailable = exports.portCheck = exports.localAddresses = void 0;
const node_net_1 = __importDefault(require("node:net"));
exports.localAddresses = ['127.0.0.1', 'localhost', '0.0.0.0', '::1'];
const portCheck = (port, host) => new Promise((resolve, reject) => {
    const server = node_net_1.default
        .createServer()
        .listen({ port, host, exclusive: true })
        .on('error', (e) => {
        if (e.code === 'EADDRINUSE') {
            reject(new Error(`Port ${port} is unavailable on address ${host}`));
        }
        else {
            reject(e);
        }
    })
        .on('listening', () => {
        server.once('close', () => resolve()).close();
    });
});
exports.portCheck = portCheck;
const isPortAvailable = (port, host) => Promise.allSettled(exports.localAddresses.map((localHost) => (0, exports.portCheck)(port, localHost))).then((settledPortChecks) => {
    // if every port check failed, then fail the `isPortAvailable` check
    if (settledPortChecks.every((result) => result.status === 'rejected')) {
        throw new Error(`Cannot open port ${port} on ipv4 or ipv6 interfaces`);
    }
    // the local addresses passed - now check the host that the user has specified
    return (0, exports.portCheck)(port, host);
});
exports.isPortAvailable = isPortAvailable;
const freePort = () => new Promise((res) => {
    const s = node_net_1.default.createServer();
    s.listen(0, () => {
        const addr = s.address();
        if (addr !== null && typeof addr !== 'string') {
            const { port } = addr;
            s.close(() => res(port));
        }
        else {
            throw Error('unable to find a free port');
        }
    });
});
exports.freePort = freePort;
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