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36 lines
793 B
36 lines
793 B
2 years ago
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'use strict';
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const net = require('net');
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const isAvailable = options => 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(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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const getPort = options => {
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options = Object.assign({}, options);
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if (typeof options.port === 'number') {
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options.port = [options.port];
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}
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return (options.port || []).reduce(
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(seq, port) => seq.catch(
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() => isAvailable(Object.assign({}, options, {port}))
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),
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Promise.reject()
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);
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};
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module.exports = options => options ?
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getPort(options).catch(() => getPort(Object.assign(options, {port: 0}))) :
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getPort({port: 0});
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module.exports.default = module.exports;
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