Move /healthz handler to handlers package

Signed-off-by: Vivek Singh <vivekkmr45@yahoo.in>

gateway/handlers/healthhandler.go

@@ -0,0 +1,20 @@
+// Copyright (c) OpenFaaS Author(s) 2019. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package handlers
+
+import "net/http"
+
+//HealthzHandler healthz hanlder for mertics server
+func HealthzHandler(w http.ResponseWriter, r *http.Request) {
+
+	switch r.Method {
+	case http.MethodGet:
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("OK"))
+		break
+
+	default:
+		w.WriteHeader(http.StatusMethodNotAllowed)
+	}
+}

gateway/server.go

@@ -232,11 +232,11 @@ func runMetricsServer() {
 	metricsHandler := metrics.PrometheusHandler()
 	router := mux.NewRouter()
 	router.Handle("/metrics", metricsHandler)
-	router.HandleFunc("/healthz", healthzHandler)
+	router.HandleFunc("/healthz", handlers.HealthzHandler)
 
 	port := 8082
-	readTimeout := time.Duration(5) * time.Second
+	readTimeout := 5 * time.Second
-	writeTimeout := time.Duration(5) * time.Second
+	writeTimeout := 5 * time.Second
 
 	s := &http.Server{
 		Addr:           fmt.Sprintf(":%d", port),
@@ -248,16 +248,3 @@ func runMetricsServer() {
 
 	log.Fatal(s.ListenAndServe())
 }
-
-func healthzHandler(w http.ResponseWriter, r *http.Request) {
-
-	switch r.Method {
-	case http.MethodGet:
-		w.WriteHeader(http.StatusOK)
-		w.Write([]byte("OK"))
-		break
-
-	default:
-		w.WriteHeader(http.StatusMethodNotAllowed)
-	}
-}