websockets

node-websockets

Web Socket Server and Client API

Support Protocols

• RFC 6455
• draft-ietf-hybi-thewebsocketprotocol-10
• draft-ietf-hybi-thewebsocketprotocol-00

Install

npm install websockets

Usage

require websockets

var websockets = require("websockets");

Server:

Server is a wrapper of http/https server.

// http based server
var server = websockets.createServer();
server.on('connect', function(socket) {
  socket.on('message', function(message) {
    socket.send('echo a message:' + message);
    ......
  });
}).listen(80);

// https based server
var secure = websockets.createServer({
  key: ssl_key,
  cert: ssl_cert
});
secure.on('connect', function(socket) {
  ......
}).listen(443);

Extended Servers such as express are also available.

// In case of 'express'
var express = require('express');

var svr = express.createServer();
svr.get('/', function(req, res) {
  ......
});
svr.configure(function() {
  ......
});

var server = websockets.createServer({
  server: svr
});
server.on('connect', function(socket) {
  socket.on('message', function(message) {
    socket.send('echo a message:' + message);
    ......
  });
}).listen(80);

Client:

Client has the interfaces like html5 WebSocket.

var socket = new websockets.WebSocket('wss://127.0.0.1');
socket.on('open', function() {
  socket.send('a message');
  ......
});

APIs

websockets.Server

Event: 'connect'

function (socket) {}

Emitted when client-server opening handshake has succeeded. socket is an instance of WebSocket.

server.broadcast(string)

Not Implemented. Sends string to all clients connected with server.

server.broadcast(buffer)

Not Implemented. Sends binary data(buffer) to all clients connected with server.

websockets.WebSocket

Event: 'open'

function () {}

Emitted when a client-server connection is successfully established.

Event: 'message'

function (data) {}

Emitted when the socket has received a message. The type of data is either string(string data) or Buffer(binary data).

Event: 'error'

function (exception) {}

Emitted on error. exception is an instance of Error.

Event: 'close'

function () {}

Emitted when a client-server connection has closed.

socket.send(string)

Sends string to the other endpoint.

socket.send(buffer)

Sends binary data(buffer) to the other endpoint.

socket.close()

Sends a connection close request to the other endpoint.

TODO = * implementation of server broadcast