huskee-install/src/lib/winstatic.js

Huskee server installer

const path = require('path')
const Cache = require('./cache')
const fs = require('fs')
const zlib = require('zlib')
const mimeModule = require('./mime')
let cache = new Cache()
let mtimeCache = new Map()

const fsStatAsync = path => new Promise(resolve => {
  fs.stat(path, (err, stats) => err ? resolve(0) : resolve(stats))
})

module.exports = async function _getStatic() {
  const { req, res, fullPath, extname } = this
  const { headers } = req
  const mime = mimeModule.see(extname)
  const stats = await fsStatAsync(fullPath)
  if(!stats) return ''
  const mtime = stats.mtime.toUTCString()
  res.writeHead(200, {
    'Content-Encoding': 'gzip',
    'Content-Type': `${mime}`,
    'Cache-Control': 'no-cache',
    'Last-Modified': mtime
  })
  if(
    headers['cache-control'] !== 'no-cache' &&
    headers['cache-control'] !== 'max-age=0' &&
    headers['if-modified-since'] &&
    headers['if-modified-since'] == mtime
  ) {
    return 'unchanged'
  }
  if(cache.get(fullPath) && mtime == mtimeCache.get(fullPath)) {
    cache.get(fullPath).pipe(res)
    return 'done'
  }
  const readStream = fs.createReadStream(fullPath)
  const gzipping = readStream.pipe(zlib.createGzip())
  mtimeCache.set(fullPath, mtime)
  gzipping.on('finish', () => {
    const caching = gzipping.pipe(cache.set(fullPath))
    caching.on('finish', () => {
      const returning = cache.get(fullPath).pipe(res)
      returning.on('finish', () => res.end())
    })
  })
  return 'done'
}