Simple websocket client/server demo

README.md

Simple demo of a node-based websocket client and server using ws.

Our server sends out a timestamp once a second and our client simply prints out any messages it receives.

Install ws:

npm install -g ws

Running the server:

# server.coffee 
websocket server created -> ws://localhost:8081
use CTRL-C to quit
connection open
connection closed
^C

Running the client:

# client.coffee 
connected (use CTRL+C to quit)
"2013-12-17T18:03:56.943Z"
"2013-12-17T18:03:57.945Z"
"2013-12-17T18:03:58.946Z"
"2013-12-17T18:03:59.947Z"
^C

Connecting to the server with wscat:

# wscat -c ws://localhost:8081
connected (press CTRL+C to quit)
< "2013-12-17T18:11:11.124Z"
< "2013-12-17T18:11:12.127Z"
< "2013-12-17T18:11:13.128Z"
< "2013-12-17T18:11:14.129Z"
> ^C

client.coffee

#!/usr/bin/env coffee 
WebSocket = require('ws')
stream = new WebSocket 'ws://localhost:8081'
stream
  .on('open', -> console.log 'connected (use CTRL+C to quit)')
  .on('message', (msg) -> console.log msg)

server.coffee

#!/usr/bin/env coffee 
WebSocketServer = require('ws').Server
wss = new WebSocketServer(port: 8081)

console.log 'websocket server created -> ws://localhost:8081'
console.log 'use CTRL-C to quit'

wss.on('connection', (ws) ->
  console.log 'connection open (press CTRL+C to quit)'

  timestamp = -> ws.send JSON.stringify(new Date())
  id = setInterval timestamp, 1000

  ws.on 'close', ->
    console.log 'connection closed'
    clearInterval id
)