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const os = require('os')
const fs = require('fs')
const exec = require('child_process').exec
const parallel = require('./parallel')
/**
* Gathers Clock, PageSize and system uptime through /proc/uptime
* This method is mocked in procfile tests
*/
function updateCpu (cpu, next) {
if (cpu !== null) {
getRealUptime(function (err, uptime) {
if (err) return next(err)
cpu.uptime = uptime
next(null, cpu)
})
return
}
parallel([
getClockAndPageSize,
getRealUptime
], function (err, data) {
if (err) return next(err)
cpu = {
clockTick: data[0].clockTick,
pageSize: data[0].pageSize,
uptime: data[1]
}
next(null, cpu)
})
}
module.exports = updateCpu
/**
* Fallback on os.uptime(), though /proc/uptime is more precise
*/
function getRealUptime (next) {
fs.readFile('/proc/uptime', 'utf8', function (err, uptime) {
if (err || uptime === undefined) {
if (!process.env.PIDUSAGE_SILENT) {
console.warn("[pidusage] We couldn't find uptime from /proc/uptime, using os.uptime() value")
}
return next(null, os.uptime() || (new Date() / 1000))
}
return next(null, parseFloat(uptime.split(' ')[0]))
})
}
function getClockAndPageSize (next) {
parallel([
function getClockTick (cb) {
getconf('CLK_TCK', { default: 100 }, cb)
},
function getPageSize (cb) {
getconf('PAGESIZE', { default: 4096 }, cb)
}
], function (err, data) {
if (err) return next(err)
next(null, { clockTick: data[0], pageSize: data[1] })
})
}
function getconf (keyword, options, next) {
if (typeof options === 'function') {
next = options
options = { default: '' }
}
exec('getconf ' + keyword, function (error, stdout, stderr) {
if (error !== null) {
if (!process.env.PIDUSAGE_SILENT) {
console.error('Error while calling "getconf ' + keyword + '"', error)
}
return next(null, options.default)
}
stdout = parseInt(stdout)
if (!isNaN(stdout)) {
return next(null, stdout)
}
return next(null, options.default)
})
}