Negroni with Prometheus

example

====server.go file====

func NewHandler() http.Handler {
	mux := http.NewServeMux()
	mux.Handle("/v1/", v1.NewHandler())
	mux.Handle("/ping", HandlePing())
	mux.Handle("/", HandlePing())
	mux.Handle("/metrics", prometheus.HandlePrometheusMetrics())
	return mux
}

func ListenAndServe(addr string, engine *core.Engine) error {
	mux := NewHandler()

	n := negroni.New()
	n.Use(negroni.NewRecovery())
	n.UseFunc(WithEngine(engine))
	n.UseFunc(NewLogger(log.StandardLogger()))
	n.UseHandler(mux)

	return http.ListenAndServe(addr, n)
}

------------------
====prometheus.go file====
func HandlePrometheusMetrics() http.Handler {

	exporter := NewExporter(scrapeURI)

	prometheus.MustRegister(exporter)
	prometheus.MustRegister(version.NewCollector("exporter"))

	return promhttp.Handler()

}