Node.js SSE example

2019-05-22

Node.js로 작성한 SSE(Server Sent Event) 예제이다.

서버:

const express = require('express')
const serveStatic = require('serve-static')
const SseStream = require('ssestream')

const app = express()
app.use(serveStatic(__dirname))
app.get('/sse', (req, res) => {
  console.log('new connection')

  const sseStream = new SseStream(req)
  sseStream.pipe(res)
  const pusher = setInterval(() => {
    sseStream.write({
      data: new Date().toTimeString()
    })
  }, 1000)

  res.on('close', () => {
    console.log('lost connection')
    clearInterval(pusher)
    sseStream.unpipe(res)
  })
})

app.listen(8080, (err) => {
  if (err) throw err
  console.log('server ready on http://localhost:8080')
})

클라이언트:

var EventSource = require('eventsource')
var es = new EventSource('http://localhost:8080/sse')
es.onmessage = e => {
    console.log(e.data)
}