Build hook for node app.

builder-server.js

/*
  Server for make a self-building gatsby site
  Build by Tonatiuh González <martiuh@gmail.com>
  with love to the community
*/
const http = require('http')
const fs = require('fs')
const { spawn, exec } = require('child_process')
const port = process.env.NODE_ENV ? parseInt(process.env.NODE_ENV, 10) : 3000
// ls.stdout.on('data', data => {
//   console.log(`stdout: ${data}`);
// });

// ls.stderr.on('data', data => {
//   console.log(`stderr: ${data}`);
// });

// ls.on('close', code => {
//   console.log(`child process exited with code ${code}`);
// });
const moveToProductionBuild = (buildCode, moveCode, res) => {
  if (buildCode === 0 && moveCode === buildCode) {
    res.writeHead(200, {
      'Content-Type': 'text/html',
    })
    const buildString = `build and moved ${Date.now()}`
    console.log(buildString)
    res.write(`<small>${buildString}</small>`)
    return res.end()
  } else {
    res.writeHead(500)
    res.write('<small>Error: during build time</small>')
    res.end()
  }
}

const buildCommand = (err, res) => {
  if (err) {
    return console.log(err)
  }
  const build = spawn('npm', ['run', 'build'], {})

  build.on('close', buildCode => {
    const overWriteAll = exec('cp -r public/* production_public/', {
      shell: true,
    })

    overWriteAll.on('close', moveCode => {
      moveToProductionBuild(buildCode, moveCode, res)
    })
  })
}

const ensureProductionPublic = res => {
  const productionPublicLocation = `${__dirname}/production_public`
  fs.readdir(productionPublicLocation, err => {
    if (err) {
      if (err.code === 'ENOENT') {
        console.log('making new directory')
        return fs.mkdir(productionPublicLocation, err => {
          buildCommand(err, res)
        })
      }
    }
    console.log('production_public exists')
    return buildCommand(null, res)
  })
}

const server = http.createServer((req, res) => {
  if (req.method === 'GET' && req.url === '/martiuh') {
    console.log('HEHEHE')
    ensureProductionPublic(res)
  } else {
    res.writeHead(200, {
      'Content-Type': 'text/html',
    })
    res.write('<small>200</small>')
    res.end()
  }
})

server.listen(port, () => console.log(`running on port: ${port}`))