@speedy-js/depcost/lib/visualization/server.js

[](https://npm.im/@speedy-js/depcost)

const cors = require('cors')
const express = require('express')
const generateReportHTML = require('./html')

const DEFAULT_PORT = 8888

module.exports = class VisualizationServer {
  constructor({
    results,
  } = {}) {
    this.results = results
  }

  async listen(port, host, callback) {
    const availblePort = await require('detect-port')(DEFAULT_PORT)
    if (DEFAULT_PORT !== availblePort) {
      console.log(`${DEFAULT_PORT} 已被占用，默认端口变更为 ${availblePort}`)
    }
    port = port ? Number(port) : availblePort

    port = port || DEFAULT_PORT
    host = host || '127.0.0.1'
    this.app.listen(port, host, () => {
      const url = `http://${host}:${port}`
      console.log()
      console.info(`Visualization Server is listening on ${url}\n`)
      callback && callback(url)
    })
  }

  async destroy() {
    await new Promise((resolve, reject) => {
      this.server.close(err => (err ? reject(err) : resolve()))
    })
    this.server = null
  }

  bootstrap() {
    if (this.app) {
      return
    }
    this.app = express()
    this.app.use(cors())

    this.app.get('/', (req, res) => {
      res.send(generateReportHTML(this.results))
    })
  }
}