/*!
* util.js - utils for bcoin
* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
* https://github.com/bcoin-org/bcoin
*/
'use strict';
const assert = require('bsert');
/**
* @exports utils/util
*/
const util = exports;
/**
* Return hrtime (shim for browser).
* @param {Array} time
* @returns {Array} [seconds, nanoseconds]
*/
util.bench = function bench(time) {
if (!process.hrtime) {
const now = Date.now();
if (time) {
const [hi, lo] = time;
const start = hi * 1000 + lo / 1e6;
return now - start;
}
const ms = now % 1000;
// Seconds
const hi = (now - ms) / 1000;
// Nanoseconds
const lo = ms * 1e6;
return [hi, lo];
}
if (time) {
const [hi, lo] = process.hrtime(time);
return hi * 1000 + lo / 1e6;
}
return process.hrtime();
};
/**
* Get current time in unix time (seconds).
* @returns {Number}
*/
util.now = function now() {
return Math.floor(Date.now() / 1000);
};
/**
* Get current time in unix time (milliseconds).
* @returns {Number}
*/
util.ms = function ms() {
return Date.now();
};
/**
* Create a Date ISO string from time in unix time (seconds).
* @param {Number?} time - Seconds in unix time.
* @returns {String}
*/
util.date = function date(time) {
if (time == null)
time = util.now();
return new Date(time * 1000).toISOString().slice(0, -5) + 'Z';
};
/**
* Get unix seconds from a Date string.
* @param {String?} date - Date ISO String.
* @returns {Number}
*/
util.time = function time(date) {
if (date == null)
return util.now();
return new Date(date) / 1000 | 0;
};
/**
* Reverse a hex-string.
* @param {Buffer}
* @returns {String} Reversed hex string.
*/
util.revHex = function revHex(buf) {
assert(Buffer.isBuffer(buf));
return Buffer.from(buf).reverse().toString('hex');
};
util.fromRev = function fromRev(str) {
assert(typeof str === 'string');
assert((str.length & 1) === 0);
return Buffer.from(str, 'hex').reverse();
};