socketcluster

SocketCluster - A Highly parallelized WebSocket server cluster to make the most of multi-core machines/instances.

SocketCluster

Complete documentation available at: http://socketcluster.io/

18 July 2015 (v2.3.0)

Renamed all occurrences of 'store' to 'broker' throughout SC (the default file store.js file was also renamed to broker.js). Since the primary purpose of a 'store' is actually to share messages and data between workers, the word 'broker' seems more appropriate. You can still save in-memory data inside 'brokers' as before (their functionality hasn't changed - Just the name).

9 July 2015 (v2.2.38)

The store.options object from the storeController (store.js) now represents the global options object (containing all settings passed to the master SocketCluster constructor) instead of just the content of storeOptions. To pass custom options to the store object, you can just add the directly to the master SocketCluster() constructor's options object. E.g:

var socketCluster = new SocketCluster({
  workers: 1,
  stores: 1,
  // ... 
  myCustomBrokerOption: 'bla',
  anotherCustomBrokerOption: 'foo',
  // ... 
});

This change was also implemented in sc-redis although we now use a storeOptions property to hold all store-related properties. So now, inside the storeController, we access the custom storeOptions property from store.options.storeOptions - This is for backwards compatibility. If you npm update socketcluster just make sure that you also npm update sc-redis - You shouldn't need to change any of your code.

SocketCluster is a fast, highly scalable HTTP + realtime server engine which lets you build multi-process realtime servers that make use of all CPU cores on a machine/instance. It removes the limitations of having to run your Node.js server as a single thread and makes your backend resilient by automatically recovering from worker crashes and aggregating errors into a central log.

Follow the project on Twitter: https://twitter.com/SocketCluster Subscribe for updates: http://socketcluster.launchrock.com/

SocketCluster has been tested for memory leaks. The last full memory profiling was done on SocketCluster v0.9.17 (Node.js v0.10.28) and included checks on worker and broker processes.

No memory leaks were detected when using the latest Node.js version. Note that leaks were found when using Node.js versions below v0.10.22 - This is probably the Node.js 'Walmart' memory leak - Not a SocketCluster issue.

  • Jonathan Gros-Dubois
  • Nelson Zheng
  • wactbprot (nData)
  • epappas (nData)
  • Gabriel Muller

There are two ways to install SocketCluster.

Setup the socketcluster command:

npm install -g socketcluster

OR

sudo npm install -g socketcluster

Then

socketcluster create myapp

Once it's installed, go to your new myapp/ directory and launch with:

node server

Access at URL http://localhost:8000/

npm install socketcluster

You will also need to install the client separately which you can get using the following command:

npm install socketcluster-client

The socketcluster-client script is called socketcluster.js (located in the main socketcluster-client directory)

  • You should include it in your HTML page using a <script> tag in order to interact with SocketCluster. For more details on how to use socketcluster-client, go to https://github.com/SocketCluster/socketcluster-client

It is recommended that you use Node.js version >=0.10.22 due to memory leaks present in older versions.

In order to run SocketCluster over HTTPS, all you need to do is set the protocol to 'https' and provide your private key and certificate as a start option when you instantiate SocketCluster - Example:

var socketCluster = new SocketCluster({
  workers: 3,
  brokers: 3,
  port: 8000,
  appName: 'myapp',
  workerController: 'worker.js',
  protocol: 'https',
  protocolOptions: {
    key: fs.readFileSync(__dirname + '/keys/enc_key.pem', 'utf8'),
    cert: fs.readFileSync(__dirname + '/keys/cert.pem', 'utf8'),
    passphrase: 'passphase4privkey'
  }
});

The protocolOptions option is exactly the same as the one you pass to a standard Node HTTPS server: http://nodejs.org/api/https.html#https_https_createserver_options_requestlistener

  • More integration test cases needed
  • Unit tests
  • Efficiency/speed - faster is better!
  • Suggestions?

To contribute; clone this repo, then cd inside it and then run npm install to install all dependencies.

(The MIT License)

Copyright (c) 2013-2015 SocketCluster.io

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.