Superagent circuit breaker

app.js

/**
 * Module dependencies
 */
var request = require("superagent")
  , breaker = require("./breaker");

// Add the circuit breaker to the default middleware
request.middleware.push(breaker(3000));

// ...snip...

request
  .get("/api")
  .end(function(err, res){
    // This should get called since the server is under load
    if(err) return console.error(err);
  });

breaker.js

/**
 * Module dependencies
 */

/**
 * Disabling configuration
 */
var globalTimeout
  , disabled = false;

/**
 * Circuit breaker middleware
 * 
 * @return {Function}
 * @api public
 */
module.exports = function(timeout) {
  return function(req, next) {
    if(disabled) return next(new Error("Server unavailable"));
    
    req.on('timeout', function(){
      disabled = true;
      globalTimeout = setTimeout(function(){
        disabled = false;
      }, timeout);
    });
    
    next();
  }
}