Created
March 18, 2016 02:38
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Simple SSE on node.js
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| var express = require('express'); | |
| var EventEmitter = require('events'); | |
| var bodyParser = require('body-parser'); | |
| var app = express(); | |
| var messageRouter = new EventEmitter(); | |
| app.use(bodyParser.urlencoded({ extended: false })); | |
| app.use(express.static('.')); | |
| app.post('/message', function(req, res) { | |
| console.log(`message arrived : ${JSON.stringify(req.body)}`); | |
| messageRouter.emit('message', req.body); | |
| res.json({ok: true}); | |
| }); | |
| // SSE middleware | |
| function eventSource (req, res, next) { | |
| res.writeHead(200, { | |
| 'Connection': 'keep-alive', | |
| 'Content-Type': 'text/event-stream', | |
| 'Cache-Control': 'no-cache' | |
| }); | |
| res.on('close', function (e) { | |
| console.log('connection ends'); | |
| }); | |
| next(); | |
| } | |
| // SSE handler | |
| app.get('/updates', eventSource, function(req, res) { | |
| messageRouter.on('message', function (body) { | |
| res.write(`data: ${JSON.stringify(body)}\n\n`); | |
| }) | |
| }); | |
| setInterval(function () { | |
| messageRouter.emit('message', {heartbeat: true}); | |
| }, 30000); | |
| var port = 5000; | |
| app.listen(port, function() { | |
| console.log(`listening on port ${port}...`); | |
| }); |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| </head> | |
| <body> | |
| <div id="messages"></div> | |
| <script> | |
| var es = new EventSource('http://localhost:5000/updates'); | |
| es.addEventListener('message', function (e) { | |
| console.log(e); | |
| var p = document.createElement('p'); | |
| p.textContent = JSON.parse(e.data).message; | |
| document.querySelector('#messages').appendChild(p); | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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| { | |
| "author": "Seungha Kim", | |
| "dependencies": { | |
| "body-parser": "^1.15.0", | |
| "express": "^4.13.4" | |
| } | |
| } |
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