我可以限制软件包在Golang中具有某些功能吗？

Question

I have packages, that are similar in functionality, as they are web request handlers.

I have functions like this for Home page in each package:

package home_page_handler


func GetUrl() string {
    return "/"
}

func GetPageName() string {
    return "HomePage"
}

To structure the code better, I wonder if I can add a restriction, may be via interfaces to make each package of some "class" contain these functions?

That way if I add one more handler, it will throw an error while compiling if a function is missing or has a wrong signature.

Answer 1

You could "register" each package with a call

package server

type PageHandler {
    url, name func() string
}

var Handlers = []PageHandler

func RegisterHandler(url func()string, name func()string) {
    Handlers = append(Handlers, PageHandler{url, name})
}

...

package home_page

...

func init() {
    server.RegisterHandler(GetUrl, GetPageName)
}

The package won't compile unless GetUrl and GetPageName are provided and the function signature is correct.