GoLang服务器上的开发分支，多个listenAndServes

Question

I'm working on a development branch for my server. The idea is to use two clones of the same git branch in two different folders, which more or less are identical. The first folder will be live, the second will be my developer.

At the moment, I'm launching the live-branch go project and later launching the developer-branch go project. Then, the entire site gets mirrored on "www.k.com/" and "www.k.com/developer/".

The problem is, this doesn't work. When I launch my second go application, everything runs fine but the last line "http.ListenAndServe" doesn't catch. There's no error that I know of that gets thrown by Listen and Serve either. This leaves my server functional but the developer/ pages throw 404's, which means the second scipt isn't doing anything. This happens to whichever I run second, meaning if I run developer then live the developer section works and the normal site doesn't.

prefix := "/"
if(utilities.Dev()){
    prefix = "/developer"
}

router := mux.NewRouter()
subrouter := router.PathPrefix(prefix).Subrouter()

subrouter.HandleFunc("/",controllers.HomeHandler).Methods("GET")
subrouter.HandleFunc("/",controllers.HomeSessionHandler).Methods("POST")
subrouter.HandleFunc("/team", controllers.TeamHandler).Methods("GET")
subrouter.HandleFunc("/contact", controllers.ContactHandler).Methods("GET")

http.Handle("/", router)
http.ListenAndServe(":80", nil)

So how can I use ListenAndServe in two different processes to combine routes from two projects? Surely there must be a way, and if not, how else would I go about creating a development environment like this?

Answer 1

Your problem is that you're trying to listen on port 80 from two different applications (I assume you're running these on the same machine?). To be honest, I'm not sure why you're not getting an error from http.ListenAndServe - you should definitely be getting a "bind: address already in use" error.

In terms of how to get this to work, the short answer is that you can't. At least not if you want to run this from two separate subprocesses.

The longer answer is that you can if you're willing to set up an HTTP proxy to intercept web traffic and then route it to the proper application (that is, you'd have both applications listening on ports other than 80, and your proxy would listen on port 80 and route to the proper application depending on the URL).

Another alternative would be to have your functionality implemented as packages. One would be the production package and one would be the development package, and your main package would ask each of these packages to register handlers. Then the main package could run http.ListenAndServe itself, and you'd still get to develop your production and development branches separately.