'use strict';
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const pRetry = require('p-retry');
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const portfinder = require('portfinder');
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const defaultPort = require('./defaultPort');
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const defaultTo = require('./defaultTo');
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const tryParseInt = require('./tryParseInt');
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function runPortFinder() {
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return new Promise((resolve, reject) => {
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portfinder.basePort = defaultPort;
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portfinder.getPort((error, port) => {
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if (error) {
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return reject(error);
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}
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return resolve(port);
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});
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});
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}
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function findPort(port) {
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if (port) {
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return Promise.resolve(port);
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}
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// Try to find unused port and listen on it for 3 times,
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// if port is not specified in options.
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// Because NaN == null is false, defaultTo fails if parseInt returns NaN
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// so the tryParseInt function is introduced to handle NaN
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const defaultPortRetry = defaultTo(
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tryParseInt(process.env.DEFAULT_PORT_RETRY),
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3
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);
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return pRetry(runPortFinder, { retries: defaultPortRetry });
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}
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module.exports = findPort;
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