去包装httprouter有记录器？

I have the following httprouter handler but I want to customize so that I can inject my own logger functions.

router := httprouter.New()
router.Handle("GET", "/mysite", mylogger(handler1))

And mylogger is like:

var logger = log.New(os.Stdout, "[Log] ", 0)
func mylogger(fn func(w http.ResponseWriter, r *http.Request, param httprouter.Params)) func(w http.ResponseWriter, r *http.Request, param httprouter.Params) {
    return func(w http.ResponseWriter, r *http.Request, param httprouter.Params) {
        start := time.Now()
        logger.Printf("%s %s", r.Method, r.URL.Path)
        fn(w, r, param)
        logger.Printf("Done in %v (%s %s)", time.Since(start), r.Method, r.URL.Path)
    }
}

And myhandler is like:

func myhandler(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    ....
}

Is there any way that I can wrap the httprouter handler that I do not have to pass handler to mylogger function? I want to do something like in Go AppEngine Context:

func AppEngineHandler(c appengine.Context, w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
  ...
  c.Infof("Here's my log")
}

Without having used the httprouter package before, it would appear all you need to do is change the function signature you're attempting to wrap.

So, firstly, change the declaration of the fn argument in the method:

func mylogger(fn func(c *myapp.Context, w http.ResponseWriter, r *http.Request, param httprouter.Params))
//                    ^^^^^ have it accept a context of your own

..then create and pass the context into your handler in the wrapper:

c := &myapp.Context{ your: arguments, here: true }
fn(c, w, r, param)
// ^^ - pass the context in

Then change the signature of your handler:

func myhandler(c *myapp.Context, w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    // use c here
}