52 lines
1.3 KiB
JavaScript
52 lines
1.3 KiB
JavaScript
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var net = require('net');
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var DEFAULT_PORT_RANGE_START = 11000;
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function testPortAsync(port) {
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return new Promise(function (fulfill, reject) {
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var server = net.createServer()
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server.listen(port, function (err) {
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server.once('close', function () {
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setTimeout(() => fulfill(true), 0);
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});
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server.close();
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});
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server.on('error', function (err) {
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setTimeout(() => fulfill(false), 0);
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});
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});
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}
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function freePortRangeAsync(rangeSize, rangeStart) {
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rangeSize = rangeSize || 1;
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return new Promise(function (fulfill, reject) {
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var lowPort = rangeStart || DEFAULT_PORT_RANGE_START;
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var awaitables = [];
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for (var i = 0; i < rangeSize; i++) {
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awaitables.push(testPortAsync(lowPort + i));
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}
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return Promise.all(awaitables).then(function (results) {
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var ports = [];
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for (var i = 0; i < results.length; i++) {
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if (!results[i]) {
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return freePortRangeAsync(rangeSize, lowPort + rangeSize).then(fulfill, reject);
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}
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ports.push(lowPort + i);
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}
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fulfill(ports);
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});
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});
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}
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function freePortAsync(rangeStart) {
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return freePortRangeAsync(1, rangeStart).then(function (result) {
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return result[0];
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});
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}
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module.exports = freePortAsync;
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module.exports.availableAsync = testPortAsync;
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module.exports.rangeAsync = freePortRangeAsync;
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