88 lines
1.9 KiB
JavaScript
88 lines
1.9 KiB
JavaScript
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var os = require('os')
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var fs = require('fs')
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var exec = require('child_process').exec
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var parallel = require('./parallel')
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/**
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* Gathers Clock, PageSize and system uptime through /proc/uptime
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* This method is mocked in procfile tests
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*/
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function updateCpu (cpu, next) {
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if (cpu !== null) {
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getRealUptime(function (err, uptime) {
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if (err) return next(err)
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cpu.uptime = uptime
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next(null, cpu)
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})
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return
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}
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parallel([
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getClockAndPageSize,
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getRealUptime
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], function (err, data) {
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if (err) return next(err)
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cpu = {
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clockTick: data[0].clockTick,
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pageSize: data[0].pageSize,
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uptime: data[1]
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}
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next(null, cpu)
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})
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}
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module.exports = updateCpu
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/**
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* Fallback on os.uptime(), though /proc/uptime is more precise
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*/
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function getRealUptime (next) {
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fs.readFile('/proc/uptime', 'utf8', function (err, uptime) {
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if (err || uptime === undefined) {
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console.warn("[pidusage] We couldn't find uptime from /proc/uptime, using os.uptime() value")
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return next(null, os.uptime())
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}
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return next(null, parseFloat(uptime.split(' ')[0]))
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})
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}
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function getClockAndPageSize (next) {
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parallel([
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function getClockTick (cb) {
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getconf('CLK_TCK', {default: 100}, cb)
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},
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function getPageSize (cb) {
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getconf('PAGESIZE', {default: 4096}, cb)
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}
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], function (err, data) {
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if (err) return next(err)
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next(null, {clockTick: data[0], pageSize: data[1]})
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})
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}
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function getconf (keyword, options, next) {
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if (typeof options === 'function') {
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next = options
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options = { default: '' }
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}
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exec('getconf ' + keyword, function (error, stdout, stderr) {
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if (error !== null) {
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console.error('Error while getting ' + keyword, error)
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return next(null, options.default)
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}
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stdout = parseInt(stdout)
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if (!isNaN(stdout)) {
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return next(null, stdout)
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}
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return next(null, options.default)
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})
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}
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