33 lines
768 B
JavaScript
33 lines
768 B
JavaScript
const toArr = require('./toArr');
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const net = require('net');
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exports = function(ports, host) {
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ports = toArr(ports);
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ports.push(0);
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return ports.reduce((seq, port) => {
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return seq.catch(() => isAvailable(port, host));
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}, Promise.reject());
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};
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function isAvailable(port, host) {
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return 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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const options = {};
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options.port = port;
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if (host) options.host = host;
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server.listen(options, () => {
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const { port } = server.address();
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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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module.exports = exports;
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