Added router priority to webui's list and detail page

pkg/muxer/http/mux.go

@@ -46,6 +46,12 @@ func (m *Muxer) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
 	http.NotFoundHandler().ServeHTTP(rw, req)
 }
 
+// GetRulePriority computes the priority for a given rule.
+// The priority is calculated using the length of rule.
+func GetRulePriority(rule string) int {
+	return len(rule)
+}
+
 // AddRoute add a new route to the router.
 func (m *Muxer) AddRoute(rule string, priority int, handler http.Handler) error {
 	parse, err := m.parser.Parse(rule)
@@ -64,10 +70,6 @@ func (m *Muxer) AddRoute(rule string, priority int, handler http.Handler) error
 		return fmt.Errorf("error while adding rule %s: %w", rule, err)
 	}
 
-	if priority == 0 {
-		priority = len(rule)
-	}
-
 	m.routes = append(m.routes, &route{
 		handler:  handler,
 		matchers: matchers,

pkg/muxer/http/mux_test.go

@@ -376,6 +376,10 @@ func Test_addRoutePriority(t *testing.T) {
 					w.Header().Set("X-From", route.xFrom)
 				})
 
+				if route.priority == 0 {
+					route.priority = GetRulePriority(route.rule)
+				}
+
 				err := muxer.AddRoute(route.rule, route.priority, handler)
 				require.NoError(t, err, route.rule)
 			}
@@ -517,3 +521,26 @@ func TestEmptyHost(t *testing.T) {
 		})
 	}
 }
+
+func TestGetRulePriority(t *testing.T) {
+	testCases := []struct {
+		desc     string
+		rule     string
+		expected int
+	}{
+		{
+			desc:     "simple rule",
+			rule:     "Host(`example.org`)",
+			expected: 19,
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			assert.Equal(t, test.expected, GetRulePriority(test.rule))
+		})
+	}
+}