web: fix asset paths for Windows platforms (#4616)

* web: fix asset paths for Windows platforms
Signed-off-by: NSimon Pasquier <spasquie@redhat.com>

* web: add tests
Signed-off-by: NSimon Pasquier <spasquie@redhat.com>

web/web.go

@@ -264,7 +264,7 @@ func New(logger log.Logger, o *Options) *Handler {
 	router.Get("/consoles/*filepath", readyf(h.consoles))
 
 	router.Get("/static/*filepath", func(w http.ResponseWriter, r *http.Request) {
-		r.URL.Path = filepath.Join("/static", route.Param(r.Context(), "filepath"))
+		r.URL.Path = path.Join("/static", route.Param(r.Context(), "filepath"))
 		fs := http.FileServer(ui.Assets)
 		fs.ServeHTTP(w, r)
 	})
@@ -825,7 +825,7 @@ func (h *Handler) getTemplate(name string) (string, error) {
 	var tmpl string
 
 	appendf := func(name string) error {
-		f, err := ui.Assets.Open(filepath.Join("/templates", name))
+		f, err := ui.Assets.Open(path.Join("/templates", name))
 		if err != nil {
 			return err
 		}

web/web_test.go

@@ -107,6 +107,12 @@ func TestReadyAndHealthy(t *testing.T) {
 		RoutePrefix:    "/",
 		EnableAdminAPI: true,
 		TSDB:           func() *libtsdb.DB { return db },
+		ExternalURL: &url.URL{
+			Scheme: "http",
+			Host:   "localhost:9090",
+			Path:   "/",
+		},
+		Version: &PrometheusVersion{},
 	}
 
 	opts.Flags = map[string]string{}
@@ -138,6 +144,11 @@ func TestReadyAndHealthy(t *testing.T) {
 	testutil.Ok(t, err)
 	testutil.Equals(t, http.StatusServiceUnavailable, resp.StatusCode)
 
+	resp, err = http.Get("http://localhost:9090/graph")
+
+	testutil.Ok(t, err)
+	testutil.Equals(t, http.StatusServiceUnavailable, resp.StatusCode)
+
 	resp, err = http.Post("http://localhost:9090/api/v2/admin/tsdb/snapshot", "", strings.NewReader(""))
 
 	testutil.Ok(t, err)
@@ -166,6 +177,11 @@ func TestReadyAndHealthy(t *testing.T) {
 	testutil.Ok(t, err)
 	testutil.Equals(t, http.StatusOK, resp.StatusCode)
 
+	resp, err = http.Get("http://localhost:9090/graph")
+
+	testutil.Ok(t, err)
+	testutil.Equals(t, http.StatusOK, resp.StatusCode)
+
 	resp, err = http.Post("http://localhost:9090/api/v2/admin/tsdb/snapshot", "", strings.NewReader(""))
 
 	testutil.Ok(t, err)