feat: 초기 프로젝트 설정 및 룰.md 파일 추가

api.hyungi.net/node_modules/pidusage/lib/helpers/cpu.js

@@ -0,0 +1,91 @@
+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)
+  })
+}