317 lines
8.3 KiB
JavaScript
Executable File
317 lines
8.3 KiB
JavaScript
Executable File
/**
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* Copyright (c) 2015 Joyent Inc. All rights reserved.
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*/
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var assert = require('assert-plus');
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var util = require('util'),
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format = util.format;
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var errors = require('./errors'),
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InternalError = errors.InternalError;
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// ---- globals
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var p = console.log;
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var UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/;
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// ---- support stuff
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function objCopy(obj, target) {
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if (target === undefined) {
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target = {};
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}
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Object.keys(obj).forEach(function (k) {
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target[k] = obj[k];
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});
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return target;
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}
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function deepObjCopy(obj) {
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return JSON.parse(JSON.stringify(obj));
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}
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function zeroPad(n, width) {
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var s = String(n);
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while (s.length < width) {
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s = '0' + s;
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}
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return s;
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}
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/**
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* Convert a boolean or string representation into a boolean, or
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* raise TypeError trying.
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*
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* @param value {Boolean|String} The input value to convert.
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* @param default_ {Boolean} The default value is `value` is undefined.
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* @param errName {String} The context to quote in the possibly
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* raised TypeError.
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*/
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function boolFromString(value, default_, errName) {
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if (value === undefined) {
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return default_;
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} else if (value === 'false' || value === '0') {
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return false;
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} else if (value === 'true' || value === '1') {
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return true;
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} else if (typeof (value) === 'boolean') {
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return value;
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} else {
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var errmsg = format('invalid boolean value: %j', value);
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if (errName) {
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errmsg = format('invalid boolean value for %s: %j', errName, value);
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}
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throw new TypeError(errmsg);
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}
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}
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/**
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* given an array return a string with each element
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* JSON-stringifed separated by newlines
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*/
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function jsonStream(arr, stream) {
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stream = stream || process.stdout;
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arr.forEach(function (elem) {
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stream.write(JSON.stringify(elem) + '\n');
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});
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}
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/**
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* given an array of key=value pairs, break them into an object
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*
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* @param {Array} kvs - an array of key=value pairs
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* @param {Array} valid (optional) - an array to validate pairs
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*/
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function kvToObj(kvs, valid) {
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var o = {};
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for (var i = 0; i < kvs.length; i++) {
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var kv = kvs[i];
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var idx = kv.indexOf('=');
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if (idx === -1)
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throw new errors.UsageError(format(
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'invalid filter: "%s" (must be of the form "field=value")',
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kv));
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var k = kv.slice(0, idx);
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var v = kv.slice(idx + 1);
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if (valid.indexOf(k) === -1)
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throw new errors.UsageError(format(
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'invalid filter name: "%s" (must be one of "%s")',
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k, valid.join('", "')));
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o[k] = v;
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}
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return o;
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}
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/**
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* return how long ago something happened
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*
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* @param {Date} when - a date object in the past
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* @param {Date} now (optional) - a date object to compare to
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* @return {String} - printable string
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*/
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function longAgo(when, now) {
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now = now || new Date();
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var seconds = Math.round((now - when) / 1000);
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var times = [
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seconds / 60 / 60 / 24 / 365, // years
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seconds / 60 / 60 / 24 / 7, // weeks
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seconds / 60 / 60 / 24, // days
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seconds / 60 / 60, // hours
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seconds / 60, // minutes
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seconds // seconds
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];
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var names = ['y', 'w', 'd', 'h', 'm', 's'];
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for (var i = 0; i < names.length; i++) {
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var time = Math.floor(times[i]);
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if (time > 0)
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return util.format('%d%s', time, names[i]);
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}
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return '0s';
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}
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/**
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* checks a string and returns a boolean based on if it
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* is a UUID or not
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*/
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function isUUID(s) {
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return /^([a-f\d]{8}(-[a-f\d]{4}){3}-[a-f\d]{12}?)$/i.test(s);
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}
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function humanDurationFromMs(ms) {
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assert.number(ms, 'ms');
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var sizes = [
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['ms', 1000, 's'],
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['s', 60, 'm'],
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['m', 60, 'h'],
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['h', 24, 'd'],
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['d', 7, 'w']
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];
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if (ms === 0) {
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return '0ms';
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}
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var bits = [];
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var n = ms;
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for (var i = 0; i < sizes.length; i++) {
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var size = sizes[i];
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var remainder = n % size[1];
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if (remainder === 0) {
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bits.unshift('');
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} else {
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bits.unshift(format('%d%s', remainder, size[0]));
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}
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n = Math.floor(n / size[1]);
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if (n === 0) {
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break;
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} else if (i === sizes.length - 1) {
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bits.unshift(format('%d%s', n, size[2]));
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break;
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}
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}
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if (bits.length > 1 && bits[bits.length - 1].slice(-2) === 'ms') {
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bits.pop();
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}
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return bits.slice(0, 2).join('');
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}
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/**
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* Adapted from <http://stackoverflow.com/a/18650828>
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*
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* @param {Number} opts.precision The number of decimal places of precision to
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* include. Note: This is just clipping (i.e. floor) instead of rounding.
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* TODO: round
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* @param {Boolean} opts.narrow Make it as narrow as possible: short units,
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* no space between value and unit, drop precision if it is all zeros.
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*/
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function humanSizeFromBytes(opts, bytes) {
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if (bytes === undefined) {
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bytes = opts;
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opts = {};
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}
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assert.number(bytes, 'bytes');
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// The number of decimal places, default 1.
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assert.optionalNumber(opts.precision, 'opts.precision');
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var precision = opts.precision === undefined ? 1 : opts.precision;
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assert.ok(precision >= 0);
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assert.optionalBool(opts.narrow, 'opts.narrow');
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var sizes = ['B', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB'];
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if (opts.narrow) {
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sizes = ['B', 'K', 'M', 'G', 'T', 'P'];
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}
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var template = opts.narrow ? '%s%s%s' : '%s%s %s';
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if (bytes === 0) {
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return '0 B';
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}
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var sign = bytes < 0 ? '-' : '';
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bytes = Math.abs(bytes);
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var i = Number(Math.floor(Math.log(bytes) / Math.log(1024)));
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var s = String(bytes / Math.pow(1024, i));
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var hasDecimal = s.indexOf('.') !== -1;
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if (precision === 0) {
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if (hasDecimal) {
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s = s.slice(0, s.indexOf('.'));
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}
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} else if (opts.narrow && !hasDecimal) {
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/* skip all-zero precision */
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/* jsl:pass */
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} else {
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if (!hasDecimal) {
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s += '.';
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}
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var places = s.length - s.indexOf('.') - 1;
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while (places < precision) {
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s += '0';
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places++;
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}
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if (places > precision) {
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s = s.slice(0, s.length - places + precision);
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}
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}
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//var precision1 = (s.indexOf('.') === -1
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// ? s + '.0' : s.slice(0, s.indexOf('.') + 2));
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return format(template, sign, s, sizes[i]);
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}
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function capitalize(s) {
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return s[0].toUpperCase() + s.substr(1);
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}
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/*
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* Normalize a short ID. Returns undefined if the given string isn't a valid
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* short id.
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*
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* Short IDs:
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* - UUID prefix
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* - allow '-' to be elided (to support using containers IDs from
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* docker)
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* - support docker ID *longer* than a UUID? The curr implementation does.
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*/
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function normShortId(s) {
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var shortIdCharsRe = /^[a-f0-9]+$/;
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var shortId;
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if (s.indexOf('-') === -1) {
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if (!shortIdCharsRe.test(s)) {
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return;
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}
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shortId = s.substr(0, 8) + '-'
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+ s.substr(8, 4) + '-'
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+ s.substr(12, 4) + '-'
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+ s.substr(16, 4) + '-'
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+ s.substr(20, 12);
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shortId = shortId.replace(/-+$/, '');
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} else {
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// UUID prefix.
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shortId = '';
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var remaining = s;
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var spans = [8, 4, 4, 4, 12];
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for (var i = 0; i < spans.length; i++) {
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var span = spans[i];
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var head = remaining.slice(0, span);
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remaining = remaining.slice(span + 1);
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if (!shortIdCharsRe.test(head)) {
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return;
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}
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shortId += head;
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if (remaining) {
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shortId += '-';
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} else {
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break;
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}
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}
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}
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return shortId;
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}
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//---- exports
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module.exports = {
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UUID_RE: UUID_RE,
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objCopy: objCopy,
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deepObjCopy: deepObjCopy,
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zeroPad: zeroPad,
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boolFromString: boolFromString,
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jsonStream: jsonStream,
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kvToObj: kvToObj,
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longAgo: longAgo,
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isUUID: isUUID,
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humanDurationFromMs: humanDurationFromMs,
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humanSizeFromBytes: humanSizeFromBytes,
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capitalize: capitalize,
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normShortId: normShortId
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};
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// vim: set softtabstop=4 shiftwidth=4:
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