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InetAddress.js
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InetAddress.js
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// Copyright 2020 The OpenZipkin Authors; licensed to You under the Apache License, Version 2.0.
class InetAddress {
constructor(addr) {
this.addr = addr;
}
// returns undefined if this isn't an IPv4 string
ipv4() {
// coercing to int forces validation here
const ipv4Int = this.toInt();
if (ipv4Int && ipv4Int !== 0) {
return this.addr;
}
return undefined;
}
toInt() {
// e.g. 10.57.50.83
// should become
// 171520595
const parts = this.addr.split('.');
// The eslint tool always complains about using bitwise operators,
// but in this case it's actually intentional, so we disable the warning:
/* eslint-disable-next-line */
return parts[0] << 24 | parts[1] << 16 | parts[2] << 8 | parts[3];
}
toString() {
return `InetAddress(${this.addr})`;
}
}
// In non-node environments we fallback to 127.0.0.1
function getLocalAddress() {
const isNode = typeof process === 'object' && typeof process.on === 'function';
if (!isNode) {
return new InetAddress('127.0.0.1');
}
// eslint-disable-next-line global-require
const networkAddress = require('./network');
return new InetAddress(networkAddress.ipv4());
}
// Cache this value at import time so as to avoid network interface
// lookup on every call
const cachedLocalAddress = getLocalAddress();
InetAddress.getLocalAddress = () => cachedLocalAddress;
module.exports = InetAddress;