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Sticky session

A simple performant way to use socket.io with a cluster.

Installation

npm install sticky-session

Usage

var sticky = require('sticky-sesion');

sticky(require('http').createServer(function(req, res) {
  res.end('worker: ' + process.env.NODE_WORKER_ID);
})).listen(3000, function() {
  console.log('server started on 3000 port');
});

Simple

var sticky = require('sticky-sesion');

sticky(function() {
  // This code will be executed only in slave workers

  var http = require('http'),
      io = require('socket.io');

  var server = http.createServer(function(req, res) {
    // ....
  });
  io.listen(server);

  return server;
}).listen(3000, function() {
  console.log('server started on 3000 port');
});

Socket.io

Reasoning

Socket.io is doing multiple requests to perform handshake and establish connection with a client. With a cluster those requests may arrive to different workers, which will break handshake protocol.

Sticky-sessions module is balancing requests using their IP address. Thus client will always connect to same worker server, and socket.io will work as expected, but on multiple processes!

LICENSE

This software is licensed under the MIT License.

Copyright Fedor Indutny, 2012.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.