1 | "use strict";
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2 |
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3 |
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4 |
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5 |
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6 |
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7 |
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8 |
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9 | const net = require("net");
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10 | const os = require("os");
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11 |
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12 | const minPort = 1024;
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13 | const maxPort = 65_535;
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14 |
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15 |
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16 |
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17 |
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18 | const getLocalHosts = () => {
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19 | const interfaces = os.networkInterfaces();
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20 |
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21 |
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22 |
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23 |
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24 | const results = new Set([undefined, "0.0.0.0"]);
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25 |
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26 | for (const _interface of Object.values(interfaces)) {
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27 | if (_interface) {
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28 | for (const config of _interface) {
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29 | results.add(config.address);
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30 | }
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31 | }
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32 | }
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33 |
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34 | return results;
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35 | };
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36 |
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37 |
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38 |
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39 |
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40 |
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41 |
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42 | const checkAvailablePort = (basePort, host) =>
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43 | new Promise((resolve, reject) => {
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44 | const server = net.createServer();
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45 | server.unref();
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46 | server.on("error", reject);
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47 |
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48 | server.listen(basePort, host, () => {
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49 |
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50 | const { port } = (
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51 | server.address()
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52 | );
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53 | server.close(() => {
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54 | resolve(port);
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55 | });
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56 | });
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57 | });
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58 |
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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 | const getAvailablePort = async (port, hosts) => {
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65 | |
66 |
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67 |
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68 |
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69 | const nonExistentInterfaceErrors = new Set(["EADDRNOTAVAIL", "EINVAL"]);
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70 |
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71 | for (const host of hosts) {
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72 | try {
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73 | await checkAvailablePort(port, host);
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74 | } catch (error) {
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75 |
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76 | if (
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77 | !nonExistentInterfaceErrors.has(
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78 | (error).code
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79 | )
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80 | ) {
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81 | throw error;
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82 | }
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83 | }
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84 | }
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85 |
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86 | return port;
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87 | };
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88 |
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89 |
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90 |
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91 |
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92 |
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93 |
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94 | async function getPorts(basePort, host) {
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95 | if (basePort < minPort || basePort > maxPort) {
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96 | throw new Error(`Port number must lie between ${minPort} and ${maxPort}`);
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97 | }
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98 |
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99 | let port = basePort;
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100 | const localhosts = getLocalHosts();
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101 | let hosts;
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102 | if (host && !localhosts.has(host)) {
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103 | hosts = new Set([host]);
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104 | } else {
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105 | |
106 |
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107 |
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108 |
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109 | hosts = localhosts;
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110 | }
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111 |
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112 | const portUnavailableErrors = new Set(["EADDRINUSE", "EACCES"]);
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113 | while (port <= maxPort) {
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114 | try {
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115 | const availablePort = await getAvailablePort(port, hosts);
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116 | return availablePort;
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117 | } catch (error) {
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118 |
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119 | if (
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120 | !portUnavailableErrors.has(
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121 | (error).code
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122 | )
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123 | ) {
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124 | throw error;
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125 | }
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126 | port += 1;
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127 | }
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128 | }
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129 |
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130 | throw new Error("No available ports found");
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131 | }
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132 |
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133 | module.exports = getPorts;
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