Help with node.js' handling of domain exceptions from clients created outside of their scopes. Check the comment for description

domains_and_clients.js

var domain = require('domain');
var redis = require('redis');
var eventEmitter = require('events').EventEmitter;

var tests = [];
var testCounter = 0;
var runTest = function(){
  if(tests.length > testCounter){
		tests[testCounter]();
	}else{
		console.log("all done!")
		process.exit();
	}
}

var myDomain = new domain.create();
myDomain.on('error', function(err){
	console.log('Yo, I just saved you from the error: ' + err);
	testCounter++;
	runTest();
});

// PASSING
tests[0] = function(){
	myDomain.run(function(){
		throw new Error('A simple error');
	});
};

// PASSING
tests[1] = function(){
	myDomain.run(function(){
		setTimeout(function(){
			process.nextTick(function(){
				var E = new eventEmitter;
				E.on('thing', function(){
					throw new Error('A deeply nested error');
				})
				setTimeout(function(){
					E.emit('thing');
				}, 100)
			});
		}, 100);
	});
}

// PASSING
var Emm = new eventEmitter;
Emm.on('thing', function(){
	throw new Error('Emmited Error defined outside of scope');
})
tests[2] = function(){
	myDomain.run(function(){
	setTimeout(function(){
			Emm.emit('thing');
		}, 100)
	})
};

// PASSING
tests[3] = function(){
	myDomain.run(function(){
		clientA = redis.createClient();
		clientA.hget('hash', 'key', function(err, data){
			throw new Error('An error after redis (A)');
		});
	});
}

// PASSING
tests[4] = function(){
	clientB = redis.createClient();
	myDomain.run(function(){
		clientB.hget('hash', 'key', function(err, data){
			throw new Error('An error after redis (B)');
		});
	});
};

// FAILING
clientC = redis.createClient();
tests[5] = function(){
	myDomain.run(function(){
		clientC.hget('hash', 'key', function(err, data){
			throw new Error('An error after redis (C)');
		});
	});
};

// start it up
runTest();

Thanks again @othiym23

ActionHero's cache commands now don't crash the server if something goes wrong :D

evantahler/actionhero@c5ebfc0