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primus-rooms-redis-adapter

primus-rooms-redis-adapter

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Redis adapter for primus-rooms. Provides integration with metroplex and omega-supreme to allow for multiple servers support.

Installation

$ npm install primus-rooms-redis-adapter --save

Getting started

The adapter relies on ioredis for the redis connection, if an incorrect instance is provided the adapter will throw an error

'use strict';
 
var Primus = require('primus');
var Redis = require('ioredis');
var Adapter = require('primus-rooms-redis-adapter');
 
var redis = new Redis(/* options */);
var adapter = new Adapter(redis, {/* options */});

Once the adapter has been initialized it can be used to initialize the primus-rooms plugin.

// as an argument  
var primus = new Primus(http, {
  transformer: 'websockets',
  rooms: {adapter: adapter},
  plugin: {
    'rooms': require('primus-rooms'),
  },
});
 
// or by setting the property 
primus.adapter = new Adapter();

Metroplex and Omega-Supreme Integration

If you are using metroplex and omega-supreme plugins, you can use the config function to allow the adapter to handle the broadcasting, removing and other things related to the multiple servers setup.

Example Metroplex and Omega-Supreme configuration

var options = {
  metroplexOmegaSupreme: true,
  primus: primus,
};
 
adapter.config(options, function(){
  console.log('clean exit');
});
// or  
primus.adapter.config(options);

API

new Adapter(redis, [options])

The constructor allows you to initialize the adapter. It requires an ioredis instance connected to a redis db.

The following (optional) options can be provided:

Name Type Description Default
namespace String namespace to use in redis storage bumblebee
metroplexOmegaSupreme Boolean Use omega-supreme to broadcast to all servers through metroplex false

adapter.config([options], [cb])

Function to configure the adapter, allows for setting flags as well as enabling clean exit logic on app termination. To add the listeners for cleanExit a primus instance must be passed in.

Note: Preforming cleanExit can take a while especially if the http server timeout is set too high. The reason for that is due to node design, see issue #2642. I recommend setting http server timeout to based on the server load higher load longer time to finish up sending data to the user. To set the time out use require('http').createServer().setTimeout(x); where x is the timeout duration you want to allow a keep-alive request to be in idle before terminating it.

Name Type Description Default
metroplexOmegaSupreme Boolean Use omega-supreme to broadcast to all servers through metroplex initilized value
primus Object Primus instance to be used to preform clean exit undefined
cb Function Callback function after a clean exit is preformed undefined