iamqp
Version:
RabbitMQ wrapper for NodeJS with several produce(reply)/consume scenarios
43 lines (38 loc) • 1.23 kB
JavaScript
const cryptoBytes = require('crypto').randomBytes
/**
* It does only one thing - generate <a href="https://tools.ietf.org/html/rfc4122">UUIDv4</a>
*/
class UUIDv4 {
constructor () {
this._byteToHex = []
for (let i = 0; i < 256; i++) {
this._byteToHex[i] = (i + 0x100).toString(16).substr(1)
}
}
/**
* @returns {string} the UUID v4
*/
generate () {
let i = 0
const randoms = cryptoBytes(16)
randoms[6] = (randoms[6] & 0x0f) | 0x40
randoms[8] = (randoms[8] & 0x3f) | 0x80
return this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] + '-' +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] + '-' +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] + '-' +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] + '-' +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]] +
this._byteToHex[randoms[i++]]
}
}
module.exports = UUIDv4