Redis backend engine for Faye with support for sharding
This plugin provides a Redis-based backend for the Faye messaging server. It allows a single Faye service to be distributed across many front-end web servers by storing state and routing messages through a Redis database server.
In addition to the normal faye-redis engine, faye-redis-sharded provides the ability to split keys across multiple redis servers via consistent hashing, and even supports publishes to different redis server clusters.
npm install faye-redis-sharded
Pass in the engine and any settings you need when setting up your Faye server.
var faye = require'faye'redis = require'faye-redis-sharded'http = require'http';var server = httpcreateServer;var bayeux =mount: '/'timeout: 25engine:type: redishosts: 'redis-server-1:6397''redis-server-1:6380' 'redis-server-2:6379'// more options;bayeuxattachserver;serverlisten8000;
The full list of settings is as follows.
The hosts option can take two forms:
// a flat array -- each server will be treated as a hostvar hosts = 'redis-server-1:6397''redis-server-1:6380' 'redis-server-2:6379'// an array of arrays -- the first nested array will be treated as the "primary" cluster// all nested arrays after the first one will be treated as "secondary" clusters and will only receive publishes// this version is useful if you have Faye running in multiple datacenters and publishes must be pushed to bothvar hosts ='redis-server-1:6397''redis-server-1:6380' 'redis-server-2:6379' // primary cluster'redis-server-4:6397''redis-server-4:6380' // secondary cluster'redis-server-5:6397''redis-server-5:6380' // secondary cluster;
The default Shard Manager uses consistent hashing using MurmurHash3 to hash the key. In most cases, the key lookup will be performed using a clientId when available instead of the actual redis key value. This is done to be able to maintain a client list per redis server so that the client list does not become a hot spot on one server.
(The MIT License)
Copyright (c) 2011-2012 James Coglan
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.
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