core: better executeMiddlewareStack trace

framework/framework/server.ts

@@ -287,17 +287,22 @@ class NotFoundHandler extends Handler {
     all() { }
 }
 
-async function executeMiddlewareStack(context: any, middlewares: { name: string, func: Function }[]) {
+function executeMiddlewareStack(context: any, middlewares: { name: string, func: Function }[]) {
-    const first = middlewares[0];
+    let index = -1;
-    if (!first) return Promise.resolve();
     context.__timers ||= {};
-    context.__timers[`${first.name}.start`] = Date.now();
+    async function dispatch(i) {
-    const next = () => executeMiddlewareStack(context, middlewares.slice(1));
+        if (i <= index) throw new Error('next() called multiple times');
+        index = i;
+        if (!middlewares[i]) return null;
+        const name = middlewares[i].name;
+        context.__timers[`${name}.start`] = Date.now();
         try {
-        return await first.func(context, next);
+            return await middlewares[i].func(context, dispatch.bind(null, i + 1));
         } finally {
-        context.__timers[`${first.name}.end`] = Date.now();
+            context.__timers[`${name}.end`] = Date.now();
         }
+    }
+    return dispatch(0);
 }
 
 interface WebServiceConfig {

packages/ui-default/pages/problem_main.page.ts

@@ -9,7 +9,7 @@ import Notification from 'vj/components/notification';
 import { downloadProblemSet } from 'vj/components/zipDownloader';
 import { NamedPage } from 'vj/misc/Page';
 import {
-  addSpeculationRules, delay, i18n, pjax, request, setTemporaryViewTransitionNames, tpl,
+  addSpeculationRules, delay, i18n, pjax, request, tpl,
 } from 'vj/utils';
 
 const list = [];