Dynamically Managing HTTP Route Handlers in Go

When working with HTTP servers in Go, it can be beneficial to have the flexibility to dynamically modify route handlers without restarting the application. This article provides a solution for both the native http.ServerMux and the popular Gorilla Toolkit's mux.Router.

Traditionally, one approach to managing routes has been to handle disabled features by returning a 404 status code. However, a more general solution involves intercepting the incoming requests and checking if the route is currently enabled.

For this purpose, we introduce the Handlers type, a collection of route handlers with associated enabled flags. The ServeHTTP method handles incoming requests by checking the flag and either invoking the handler or returning a 404 error.

The HandleFunc method registers routes with the underlying multiplexer and adds them to the Handlers map. When subsequently called, the method ensures that only enabled handlers are executed.

<code class="go">package main

import (
    "net/http"
    "sync"
)

type HasHandleFunc interface {
    HandleFunc(pattern string, handler func(w http.ResponseWriter, req *http.Request))
}
type Handler struct {
    http.HandlerFunc
    Enabled bool
}
type Handlers map[string]*Handler

func (h Handlers) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    path := r.URL.Path
    if handler, ok := h[path]; ok && handler.Enabled {
        handler.ServeHTTP(w, r)
    } else {
        http.Error(w, "Not Found", http.StatusNotFound)
    }
}

func (h Handlers) HandleFunc(mux HasHandleFunc, pattern string, handler http.HandlerFunc) {
    h[pattern] = &Handler{handler, true}
    mux.HandleFunc(pattern, h.ServeHTTP)
}

func main() {
    mux := http.NewServeMux()
    handlers := Handlers{}
    handlers.HandleFunc(mux, "/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("this will show once"))
        handlers["/"].Enabled = false
        // the route to '/' is now disabled
    })
    http.Handle("/", mux)
    http.ListenAndServe(":9020", nil)
}</code>

With this solution, you can dynamically disable or enable routes and even set up time-based routing patterns, catering to the need for flexible HTTP route management in Go.

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