fix(trace-viewer): redirect, time and missing snapshot bugfixes (#10055)

packages/playwright-core/src/web/traceViewer/snapshotRenderer.ts

@@ -80,9 +80,10 @@ export class SnapshotRenderer {
     if (!html)
       return { html: '', pageId: snapshot.pageId, frameId: snapshot.frameId, index: this._index };
 
-    if (snapshot.doctype)
-      html = `<!DOCTYPE ${snapshot.doctype}>` + html;
-    html += `
+    // Hide the document in order to prevent flickering. We will unhide once script has processed shadow.
+    const hideAllStyle = '<style>*,*::before,*::after { visibility: hidden }</style>';
+    const prefix = snapshot.doctype ? `<!DOCTYPE ${snapshot.doctype}>` + hideAllStyle : hideAllStyle;
+    html = prefix + html + `
       <style>*[__playwright_target__="${this.snapshotName}"] { background-color: #6fa8dc7f; }</style>
       <script>${snapshotScript()}</script>
     `;
@@ -240,6 +241,7 @@ function snapshotScript() {
         pointElement.style.top = pointY + 'px';
         document.documentElement.appendChild(pointElement);
       }
+      document.styleSheets[0].disabled = true;
     };
     window.addEventListener('load', onLoad);
   }

packages/playwright-core/src/web/traceViewer/snapshotServer.ts

@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import type { ResourceSnapshot } from '../../server/trace/common/snapshotTypes';
 import { SnapshotStorage } from './snapshotStorage';
 import type { Point } from '../../common/types';
 import { URLSearchParams } from 'url';
@@ -44,7 +43,9 @@ export class SnapshotServer {
     return this._respondWithJson(snapshot ? {
       viewport: snapshot.viewport(),
       url: snapshot.snapshot().frameUrl
-    } : {});
+    } : {
+      error: 'No snapshot found'
+    });
   }
 
   private _snapshot(pathname: string, params: URLSearchParams) {
@@ -70,15 +71,7 @@ export class SnapshotServer {
       return new Response(null, { status: 404 });
 
     const sha1 = resource.response.content._sha1;
-    if (!sha1)
-      return new Response(null, { status: 404 });
-    return this._innerServeResource(sha1, resource);
-  }
-
-  private async _innerServeResource(sha1: string, resource: ResourceSnapshot): Promise<Response> {
-    const content = await this._snapshotStorage.resourceContent(sha1);
-    if (!content)
-      return new Response(null, { status: 404 });
+    const content = sha1 ? await this._snapshotStorage.resourceContent(sha1) || new Blob([]) : new Blob([]);
 
     let contentType = resource.response.content.mimeType;
     const isTextEncoding = /^text\/|^application\/(javascript|json)/.test(contentType);
@@ -95,7 +88,11 @@ export class SnapshotServer {
     headers.delete('Content-Length');
     headers.set('Content-Length', String(content.size));
     headers.set('Cache-Control', 'public, max-age=31536000');
-    return new Response(content, { headers });
+    return new Response(content, {
+      headers,
+      status: resource.response.status,
+      statusText: resource.response.statusText,
+    });
   }
 }
 

packages/playwright-core/src/web/traceViewer/ui/callTab.tsx

@@ -42,7 +42,7 @@ export const CallTab: React.FunctionComponent<{
     <div className='call-line'>{action.metadata.apiName}</div>
     {<>
       <div className='call-section'>Time</div>
-      <div className='call-line'>wall time: <span className='datetime' title={wallTime}>{wallTime}</span></div>
+      {action.metadata.wallTime && <div className='call-line'>wall time: <span className='datetime' title={wallTime}>{wallTime}</span></div>}
       <div className='call-line'>duration: <span className='datetime' title={duration}>{duration}</span></div>
     </>}
     { !!paramKeys.length && <div className='call-section'>Parameters</div> }

packages/playwright-core/src/web/traceViewer/ui/snapshotTab.tsx

@@ -63,7 +63,8 @@ export const SnapshotTab: React.FunctionComponent<{
       if (snapshotInfoUrl) {
         const response = await fetch(snapshotInfoUrl);
         const info = await response.json();
-        setSnapshotInfo(info);
+        if (!info.error)
+          setSnapshotInfo(info);
       }
       if (!iframeRef.current)
         return;

tests/snapshotter.spec.ts

@@ -216,6 +216,7 @@ function distillSnapshot(snapshot, distillTarget = true) {
   if (distillTarget)
     html = html.replace(/\s__playwright_target__="[^"]+"/g, '');
   return html
+      .replace(/<style>\*,\*::before,\*::after { visibility: hidden }<\/style>/, '')
       .replace(/<script>[.\s\S]+<\/script>/, '')
       .replace(/<style>.*__playwright_target__.*<\/style>/, '')
       .replace(/<BASE href="about:blank">/, '')

tests/trace-viewer/trace-viewer.spec.ts

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import fs from 'fs';
 import path from 'path';
 import type { Browser, Frame, Locator, Page } from 'playwright-core';
 import { showTraceViewer } from '../../packages/playwright-core/lib/server/trace/viewer/traceViewer';
@@ -552,3 +553,29 @@ test('should show action source', async ({ showTraceViewer }) => {
   await expect(page.locator('.source-line-running')).toContainText('page.click');
   await expect(page.locator('.stack-trace-frame.selected')).toHaveText(/doClick.*trace-viewer\.spec\.ts:[\d]+/);
 });
+
+test('should follow redirects', async ({ page, runAndTrace, server, asset }) => {
+  server.setRoute('/empty.html', (req, res) => {
+    res.writeHead(200, { 'Content-Type': 'text/html' });
+    res.end(`<div><img id=img src="image.png"></img></div>`);
+  });
+  server.setRoute('/image.png', (req, res) => {
+    res.writeHead(301, { location: '/image-301.png' });
+    res.end();
+  });
+  server.setRoute('/image-301.png', (req, res) => {
+    res.writeHead(302, { location: '/image-302.png' });
+    res.end();
+  });
+  server.setRoute('/image-302.png', (req, res) => {
+    res.writeHead(200, { 'content-type': 'image/png' });
+    res.end(fs.readFileSync(asset('digits/0.png')));
+  });
+
+  const traceViewer = await runAndTrace(async () => {
+    await page.goto(server.EMPTY_PAGE);
+    expect(await page.evaluate(() => (window as any).img.naturalWidth)).toBe(10);
+  });
+  const snapshotFrame = await traceViewer.snapshotFrame('page.evaluate');
+  await expect(snapshotFrame.locator('img')).toHaveJSProperty('naturalWidth', 10);
+});