socket.io-mongo

Socket.io store implementation backed by mongodb.

This store is for people who is already using mongodb and don't want to add redis. Pubsub is implemented via "mubsub" module, which is using capped collections and tailable cursors.

Any benches or experiences in comparison to redis are welcome.

Install

If "msgpack" is installed, it will be used instead of JSON.stringify/parse.

npm i socket.io-mongo

Usage example

var socketio = require('socket.io'),
    express = require('express'),
    MongoStore = require('socket.io-mongo'),
    app = express.createServer(),
    io = io.listen(app);

app.listen(8000);

io.configure(function() {
    var store = new MongoStore({url: 'mongodb://localhost:27017/yourdb'});
    store.on('error', console.error);
    io.set('store', store);
});

io.sockets.on('connection', function (socket) {
    socket.emit('news', { hello: 'world' });
    socket.on('my other event', function (data) {
        console.log(data);
    });
});

Options

// Default options
{
    // collection name is prefix + name
    collectionPrefix: 'socket.io.',
    // capped collection name
    streamCollection: 'stream',
    // collection name used for key/value storage
    storageCollection: 'storage',
    // id that uniquely identifies this node
    nodeId: null,
    // max size in bytes for capped collection
    size: 100000,
    // max number of documents inside of capped collection
    num: null,
    // db url e.g. "mongodb://localhost:27017/yourdb"
    url: null,
    // optionally you can pass everything separately
    host: 'localhost',
    port: 27017,
    db: 'socketio'
}

new MongoStore(options);

Benchmarks

On my mb air with locally installed db's, using absolutely the same code, only different storages. Testing pubsub means each event is published and received, testing storage means every key is set, read and deleted.

node bench --db mongo --test pubsub --amount 50000
Testing pubsub , using mongo , amount: 50000 , data: mytestdata
pubsub: 5772ms

node bench --db redis --test pubsub --amount 50000
Testing pubsub , using redis , amount: 50000 , data: mytestdata
pubsub: 5106ms

node bench --db mongo --test storage --amount 20000
Testing storage , using mongo , amount: 20000 , data: mytestdata
storage: 8382ms

node bench --db redis --test storage --amount 20000
Testing storage , using redis , amount: 20000 , data: mytestdata
storage: 6224ms

Run tests

npm i
make test