Google Run test code with file system layout

index.js

const express = require('express')
const fs = require('fs')
const path = require('path')
const app = express()

let coldstart = true

const fsExplore = async dir => {
  try {
    const dirContents = fs.readdirSync(dir, {
      encoding: 'utf8',
      withFileTypes: true
    })

    let dirObject = {}

    for (let i = 0; i < dirContents.length; i++) {
      const filename = dirContents[i].name
      if (dirContents[i].isDirectory()) {
        const fullDir = path.join(dir, filename)
        dirObject[filename] = await fsExplore(fullDir)
      } else {
        try {
          const fileStats = fs.statSync(path.join(dir, filename))
          const unixFilePermissions =
            '0' + (fileStats.mode & parseInt('777', 8)).toString(8)
          dirObject[filename] = {
            unixFilePermissions,
            size: fileStats.size
          }
        } catch (error) {
          dirObject[filename] = error
        }
      }
    }
    return dirObject
  } catch (error) {
    console.log(error)
    return error
  }
}

const dirExplore = async dir => {
  try {
    const dirContents = fs.readdirSync(dir, {
      encoding: 'utf8',
      withFileTypes: true
    })

    let dirObject = {}
    let dirSize = 0

    for (let i = 0; i < dirContents.length; i++) {
      const filename = dirContents[i].name

      if (dirContents[i].isDirectory()) {
        const fullDir = path.join(dir, filename)
        dirObject[filename] = await dirExplore(fullDir)
        dirSize += dirObject[filename]._size
      } else {
        try {
          const fileStats = fs.statSync(path.join(dir, filename))
          dirSize += fileStats.size
        } catch (error) {
          dirSize += 0
        }
      }
    }
    dirObject['_size'] = dirSize
    return dirObject
  } catch (error) {
    console.log(error)
    return error
  }
}

app.get('/', async (req, res) => {
  if (coldstart) {
    console.log('First request after coldstart')
    coldstart = false
  }

  const rootDir = path.join(__dirname, '..', '..', '..')

  if (req.query.inspect == 'file') {
    const fileData = await fsExplore(rootDir)
    res.send(JSON.stringify(fileData, null, 2))
  } else {
    if (req.query.inspect == 'directory') {
      const dirData = await dirExplore(rootDir)
      res.send(JSON.stringify(dirData, null, 2))
    } else {
      const target = process.env.TARGET || 'World'
      res.send(`Hello ${target}!`)
    }
  }
})

const port = process.env.PORT || 8080
app.listen(port, () => {
  console.log('Coldstart!', port)
})