feat(gin,run): add expose out http.Server can use Server config

gin.go

@@ -295,6 +295,23 @@ func (engine *Engine) Run(addr ...string) (err error) {
 	return
 }
 
+// Run attaches the router to a http.Server and starts listening and serving HTTP requests.
+// You can use your http.server config like ReadTimeout ...
+// It is a shortcut for http.ListenAndServe(addr, router)
+// Note: this method will block the calling goroutine indefinitely unless an error happens.
+func (engine *Engine) RunServer(server *http.Server, addr ...string) (err error) {
+  defer func() { debugPrintError(err) }()
+  
+  address := resolveAddress(addr)
+  debugPrint("Listening and serving HTTP on %s\n", address)
+  if len(addr) > 0{
+    server.Addr = address
+  }
+  server.Handler = engine
+  err = server.ListenAndServe()
+  return
+}
+
 // RunTLS attaches the router to a http.Server and starts listening and serving HTTPS (secure) requests.
 // It is a shortcut for http.ListenAndServeTLS(addr, certFile, keyFile, router)
 // Note: this method will block the calling goroutine indefinitely unless an error happens.

gin_integration_test.go

@@ -54,6 +54,22 @@ func TestRunEmpty(t *testing.T) {
 	testRequest(t, "http://localhost:8080/example")
 }
 
+func TestRunServer(t *testing.T) {
+	os.Setenv("PORT", "")
+	router := New()
+	service := &http.Server{}
+	go func() {
+		router.GET("/example", func(c *Context) { c.String(http.StatusOK, "it worked") })
+		assert.NoError(t, router.RunServer(service),":8080")
+	}()
+	// have to wait for the goroutine to start and run the server
+	// otherwise the main thread will complete
+	time.Sleep(5 * time.Millisecond)
+	
+	assert.Error(t, router.RunServer(service),":8080")
+	testRequest(t, "http://localhost:8080/example")
+}
+
 func TestRunTLS(t *testing.T) {
 	router := New()
 	go func() {