1 | const portfinder = require('portfinder')
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9 | module.exports = async (portUsed) => {
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10 |
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11 | const portStart = 3000
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12 | const portEnd = 65535
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13 |
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14 |
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15 | const ranges = [
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16 | [portStart, portEnd]
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17 | ]
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18 |
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19 |
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20 |
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21 |
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22 | const portsIgnore = []
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23 | if (isNumber(portUsed)) {
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24 | portsIgnore.push(parseInt(portUsed))
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25 | } else if (Array.isArray(portUsed)) {
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26 | portUsed.filter(value => isNumber(value))
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27 | .forEach(port => portsIgnore.push(parseInt(port)))
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28 | } else if (typeof portUsed === 'object') {
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29 | Object.values(portUsed)
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30 | .filter(value => isNumber(value))
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31 | .forEach(port => portsIgnore.push(parseInt(port)))
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32 | }
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33 |
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34 |
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35 |
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36 |
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37 | if (portsIgnore.length) {
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38 | ranges.shift()
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39 | let lastPort = portStart
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40 | portsIgnore.forEach(port => {
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41 | ranges.push([lastPort, port - 1])
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42 | lastPort = port
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43 | })
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44 | }
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45 |
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46 |
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47 |
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48 | for (let [start, end] of ranges) {
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49 | const result = await getFreePort(start, end)
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50 |
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51 | if (result)
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52 | return result
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53 | }
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54 | }
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55 |
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56 | const isNumber = (value) => Boolean(
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57 | typeof value === 'number' ||
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58 | !isNaN(value)
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59 | )
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60 |
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61 |
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62 |
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63 |
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64 |
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65 |
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66 |
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67 | const getFreePort = async (start, end) =>
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68 | portfinder.getPortPromise({
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69 | port: start,
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70 | stopPort: end
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71 | })
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72 | .then((port) => {
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73 |
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74 |
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75 |
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76 |
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77 | return port
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78 | })
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79 | .catch((/*err*/) => {
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80 |
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81 |
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82 |
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83 | })
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