Great article btw!

That's why I've added missing methods here:

https://github.com/mailgun/manners

Getting files from listener:

https://github.com/mailgun/manners/blob/master/listener.go#L...

Starting server with external listener:

https://github.com/mailgun/manners/blob/master/server.go#L87

It's used to restart Vulcand without downtime:

https://github.com/mailgun/vulcand/blob/master/service/servi...

Let's collaborate on this as a library if you are interested