A RedisClient that always errors.

zombieRedisClient.js

var redis  = require('redis')
  , util   = require('util')
  , events = require('events');


// This aims to implement enough of the stream interface to survive in the RedisClient:
function EmptyStream() {
  events.EventEmitter.call(this);
}
util.inherits(EmptyStream, events.EventEmitter);
EmptyStream.prototype.destroySoon = function destroySoon() {};


/**
 * A "Zombie" RedisClient. This client will behave like any other, but will not attempt
 * any connections, and will respond to all queries immediately with an error.
 */
function ZombieRedisClient() {
  redis.RedisClient.call(this, new EmptyStream(), { no_ready_check: 1, max_attempts: 1 });
}
util.inherits(ZombieRedisClient, redis.RedisClient);
ZombieRedisClient.prototype.send_command = function (cmd, args, cb) {
  if (!cb) { cb = args.pop(); }
  if (typeof cb !== "function") { return; }
  process.nextTick(cb.bind(null, new Error("Redis server is down")));
};

// Useage:
// var client = new ZombieRedisClient();

module.exports = ZombieRedisClient;