51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
var mapLimit = require('map-limit')
|
|
var net = require('net')
|
|
var DEFAULT_MAX_PORT = 65535
|
|
|
|
module.exports = getPorts
|
|
function getPorts (basePorts, maxPort, cb) {
|
|
if (!Array.isArray(basePorts)) {
|
|
throw new TypeError('must provide array of ports as first argument')
|
|
}
|
|
if (typeof maxPort !== 'number') {
|
|
cb = maxPort
|
|
maxPort = DEFAULT_MAX_PORT
|
|
}
|
|
if (typeof cb !== 'function') {
|
|
throw new TypeError('must provide callback function')
|
|
}
|
|
if (!isFinite(maxPort)) {
|
|
throw new TypeError('maxPort must be a finite number')
|
|
}
|
|
|
|
var usedPorts = []
|
|
mapLimit(basePorts, 1, function (base, next) {
|
|
getNextPort(base, function (err, port) {
|
|
if (err) return next(new Error('no ports found after ' + base))
|
|
next(null, port)
|
|
})
|
|
}, cb)
|
|
|
|
function getNextPort (basePort, cb) {
|
|
// skip used ports
|
|
while (basePort < maxPort && usedPorts.indexOf(basePort) >= 0) {
|
|
basePort++
|
|
}
|
|
|
|
if (basePort >= maxPort) {
|
|
return process.nextTick(function () {
|
|
cb(new Error('no open ports'))
|
|
})
|
|
}
|
|
|
|
var c = net.connect(basePort, function () {
|
|
c.destroy()
|
|
getNextPort(basePort + 1, cb)
|
|
})
|
|
c.on('error', function () {
|
|
usedPorts.push(basePort)
|
|
cb(null, basePort)
|
|
})
|
|
}
|
|
}
|