Product
Introducing License Enforcement in Socket
Ensure open-source compliance with Socket’s License Enforcement Beta. Set up your License Policy and secure your software!
Server-Sent Events with Namespaces and Channels
a minimal working example using koa
const Koa = require('koa')
const {SSE, koaMiddleware} = require('einbahn')
const app = new Koa()
const sse = new SSE()
sse.on('connection', client => {
client.send({event: 'welcome', data: 'message from server'})
})
app.use(koaMiddleware(sse))
app.use((ctx, next) => {
ctx.body = `<html><meta charset='utf8'/><script>
let es = new EventSource('/')
es.addEventListener('welcome', ({ data }) => {
alert(JSON.parse(data))
})
</script></html>`
})
app.listen(3000, err => console.log(err ? err : 'listen on http://localhost:3000'))
by default all client are connected to the /
namespace:
new EventSource('/')
to connect to a specific namespace:
new EventSource('/namespace1')
server side code
const ns1 = sse.of('/namespace1')
// send event to all client within the namespace
ns1.send({event: 'time', data: new Date()})
a namespace can have multiple channels, to join client to a channel:
sse.on('connection', (client, lastId, query) => {
client.join('chan1')
sse.to('chan1').send({data: new Date()})
})
FAQs
sever sent events with namespaces and channels
We found that einbahn demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Product
Ensure open-source compliance with Socket’s License Enforcement Beta. Set up your License Policy and secure your software!
Product
We're launching a new set of license analysis and compliance features for analyzing, managing, and complying with licenses across a range of supported languages and ecosystems.
Product
We're excited to introduce Socket Optimize, a powerful CLI command to secure open source dependencies with tested, optimized package overrides.