161 lines
6.8 KiB
JavaScript
161 lines
6.8 KiB
JavaScript
'use strict';
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// ==================================================================================
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// index.js
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// ----------------------------------------------------------------------------------
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// Description: System Information - library
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// for Node.js
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// Copyright: (c) 2014 - 2016
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// Author: Sebastian Hildebrandt
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// ----------------------------------------------------------------------------------
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// License: MIT
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// ==================================================================================
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// 5. Memory
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// ----------------------------------------------------------------------------------
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const os = require('os');
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const exec = require('child_process').exec;
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const fs = require('fs');
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const util = require('./util');
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let _platform = os.type();
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const _linux = (_platform == 'Linux');
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const _darwin = (_platform == 'Darwin');
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const _windows = (_platform == 'Windows_NT');
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const NOT_SUPPORTED = 'not supported';
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// _______________________________________________________________________________________
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// | R A M | H D |
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// |______________________|_________________________| | |
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// | active buffers/cache | | |
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// |________________________________________________|___________|_________|______________|
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// | used free | used free |
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// |____________________________________________________________|________________________|
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// | total | swap |
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// |____________________________________________________________|________________________|
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// free (older versions)
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// ----------------------------------
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// # free
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// total used free shared buffers cached
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// Mem: 16038 (1) 15653 (2) 384 (3) 0 (4) 236 (5) 14788 (6)
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// -/+ buffers/cache: 628 (7) 15409 (8)
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// Swap: 16371 83 16288
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//
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// |------------------------------------------------------------|
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// | R A M |
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// |______________________|_____________________________________|
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// | active (2-(5+6) = 7) | available (3+5+6 = 8) |
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// |______________________|_________________________|___________|
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// | active | buffers/cache (5+6) | |
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// |________________________________________________|___________|
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// | used (2) | free (3) |
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// |____________________________________________________________|
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// | total (1) |
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// |____________________________________________________________|
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//
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// free (since free von procps-ng 3.3.10)
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// ----------------------------------
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// # free
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// total used free shared buffers/cache available
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// Mem: 16038 (1) 628 (2) 386 (3) 0 (4) 15024 (5) 14788 (6)
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// Swap: 16371 83 16288
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//
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// |------------------------------------------------------------|
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// | R A M |
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// |______________________|_____________________________________|
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// | | available (6) estimated |
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// |______________________|_________________________|___________|
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// | active (2) | buffers/cache (5) | free (3) |
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// |________________________________________________|___________|
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// | total (1) |
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// |____________________________________________________________|
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//
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// Reference: http://www.software-architect.net/blog/article/date/2015/06/12/-826c6e5052.html
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module.exports = function (callback) {
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return new Promise((resolve, reject) => {
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process.nextTick(() => {
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if (_windows) {
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let error = new Error(NOT_SUPPORTED);
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if (callback) { callback(NOT_SUPPORTED) }
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reject(error);
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}
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var result = {
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total: os.totalmem(),
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free: os.freemem(),
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used: os.totalmem() - os.freemem(),
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active: os.totalmem() - os.freemem(), // temporarily (fallback)
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available: os.freemem(), // temporarily (fallback)
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buffcache: 0,
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swaptotal: 0,
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swapused: 0,
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swapfree: 0
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};
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if (_linux) {
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exec("free -b", function (error, stdout) {
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if (!error) {
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let lines = stdout.toString().split('\n');
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let mem = lines[1].replace(/ +/g, " ").split(' ');
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result.total = parseInt(mem[1]);
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result.free = parseInt(mem[3]);
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if (lines.length === 4) { // free (since free von procps-ng 3.3.10)
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result.buffcache = parseInt(mem[5]);
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result.available = parseInt(mem[6]);
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mem = lines[2].replace(/ +/g, " ").split(' ');
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} else { // free (older versions)
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result.buffcache = parseInt(mem[5]) + parseInt(mem[6]);
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result.available = result.free + result.buffcache;
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mem = lines[3].replace(/ +/g, " ").split(' ');
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}
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result.active = result.total - result.free - result.buffcache;
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result.swaptotal = parseInt(mem[1]);
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result.swapfree = parseInt(mem[3]);
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result.swapused = parseInt(mem[2]);
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}
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if (callback) { callback(result) }
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resolve(result);
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});
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}
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if (_darwin) {
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exec("vm_stat | grep 'Pages active'", function (error, stdout) {
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if (!error) {
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let lines = stdout.toString().split('\n');
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result.active = parseInt(lines[0].split(':')[1]) * 4096;
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result.buffcache = result.used - result.active;
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result.available = result.free + result.buffcache;
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}
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exec("sysctl -n vm.swapusage", function (error, stdout) {
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if (!error) {
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let lines = stdout.toString().split('\n');
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if (lines.length > 0) {
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let line = lines[0].replace(/,/g, ".").replace(/M/g, "");
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line = line.trim().split(' ');
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for (let i = 0; i < line.length; i++) {
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if (line[i].toLowerCase().indexOf('total') != -1) result.swaptotal = parseFloat(line[i].split('=')[1].trim()) * 1024 * 1024;
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if (line[i].toLowerCase().indexOf('used') != -1) result.swapused = parseFloat(line[i].split('=')[1].trim()) * 1024 * 1024;
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if (line[i].toLowerCase().indexOf('free') != -1) result.swapfree = parseFloat(line[i].split('=')[1].trim()) * 1024 * 1024;
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}
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}
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}
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if (callback) { callback(result) }
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resolve(result);
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});
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});
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}
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});
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});
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};
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