socket.io-emitter

socket.io-emitter

socket.io-emitter allows you to communicate with socket.io servers easily from non-socket.io processes.

How to use

var io = require('socket.io-emitter')({ host: '127.0.0.1', port: 6379 });
setInterval(function(){
  io.emit('time', new Date);
}, 5000);

// Different constructor options.

//1. Initialize with host:port string
var io = require('socket.io-emitter')("localhost:6379")
// 2. Initlize with host, port object.
var io = require('socket.io-emitter')({ host: '127.0.0.1', port: 6379 });
// 3. Can use other node_redis compatible client eg; ioredis.

var Redis = require("ioredis");
var redis = new Redis();
var io = require('socket.io-emitter')(redis);

// Make the emitter works with redis clustered environment.
var Cluster = new Redis.Cluster([
    {
        host: "localhost",
        port: 6379
    },
    {
        host: "localhost",
        port: 6378
    },
]);
var io = require('socket.io-emitter')(Cluster);

Examples

  var io = require('socket.io-emitter')({ host: '127.0.0.1', port: 6379 });

  // sending to all clients
  io.emit('broadcast', /* ... */);

  // sending to all clients in 'game' room
  io.to('game').emit('new-game', /* ... */);

  // sending to individual socketid (private message)
  io.to(<socketid>).emit('private', /* ... */);

  var nsp = io.of('/admin');

  // sending to all clients in 'admin' namespace
  nsp.emit('namespace', /* ... */);

  // sending to all clients in 'admin' namespace and in 'notifications' room
  nsp.to('notifications').emit('namespace', /* ... */);

Note: acknowledgements are not supported

Error handling

Access the redis to subscribe to its error event:

var emitter = require('socket.io-emitter')("localhost:6379");

emitter.redis.on('error', onError);

function onError(err){
  console.log(err);
}

API

Emitter(client[, opts])

client is a node_redis compatible client that has been initialized with the return_buffers option set to true. This argument is optional.

The following options are allowed:

• key: the name of the key to pub/sub events on as prefix (socket.io)
• host: host to connect to redis on (localhost)
• port: port to connect to redis on (6379)
• socket: unix domain socket to connect to redis on ("/tmp/redis.sock")

Emitter(clientUri[, opts]

Same as above, but clientUri is a string of the format host:port to connect to redis to.

Emitter(opts)

If you don't want to supply a redis client object, and want socket.io-emitter to intiialize one for you, make sure to supply the host and port options.

Emitter#to(room:String):Emitter

Emitter#in(room:String):Emitter

Specifies a specific room that you want to emit to.

Emitter#of(namespace:String):Emitter

Specifies a specific namespace that you want to emit to.

License

MIT