[peterbe#112] List what timed out

.gitignore

@@ -1 +1,2 @@
 node_modules
+yarn-error.log

README.md

@@ -175,6 +175,7 @@ key is `urls`. Other optional options are:
 * `puppeteerArgs` - Args sent to puppeteer when launching. [List
   of strings for headless Chrome](https://peter.sh/experiments/chromium-command-line-switches/).
 * `cssoOptions` - CSSO compress function [options](https://github.com/css/csso#compressast-options)
+* `timeout` - Maximum navigation time in milliseconds, defaults to 30 seconds, pass 0 to disable timeout.
 
 ## Warnings
 

src/run.js

@@ -7,6 +7,7 @@ const csso = require('csso');
 const csstree = require('css-tree');
 const cheerio = require('cheerio');
 const utils = require('./utils');
+const { createTracker } = require('./tracker');
 const url = require('url');
 
 const isOk = response => response.ok() || response.status() === 304;
@@ -124,8 +125,13 @@ const processPage = ({
     // a second time.
     let fulfilledPromise = false;
 
+    const tracker = createTracker(page);
     const safeReject = error => {
       if (!fulfilledPromise) {
+        if (error.message.startsWith('Navigation Timeout Exceeded')) {
+          error.message += `\nOn one of the following request: ${tracker.urls().join(',')}`
+        }
+        tracker.dispose();
         reject(error);
       }
     };
@@ -146,6 +152,10 @@ const processPage = ({
         await page.setViewport(options.viewport);
       }
 
+      if (options.timeout !== undefined) {
+        page.setDefaultNavigationTimeout(options.timeout);
+      }
+
       // A must or else you can't do console.log from within page.evaluate()
       page.on('console', msg => {
         if (debug) {
@@ -311,7 +321,10 @@ const processPage = ({
         allHrefs.push(href);
       });
 
-      if (!fulfilledPromise) resolve();
+      if (!fulfilledPromise) {
+        tracker.dispose();
+        resolve();
+      }
     } catch (e) {
       return safeReject(e);
     }

src/tracker.js

@@ -0,0 +1,18 @@
+const createTracker = page => {
+  const requests = new Set();
+  const onStarted = request => requests.add(request);
+  const onFinished = request => requests.delete(request);
+  page.on('request', onStarted);
+  page.on('requestfinished', onFinished);
+  page.on('requestfailed', onFinished);
+  return {
+    urls: () => Array.from(requests).map(r => r.url()),
+    dispose: () => {
+      page.removeListener('request', onStarted);
+      page.removeListener('requestfinished', onFinished);
+      page.removeListener('requestfailed', onFinished);
+    }
+  };
+};
+
+module.exports = { createTracker };

tests/main.test.js

@@ -16,6 +16,10 @@ fastify.get('/307.html', (req, reply) => {
   reply.redirect(307, '/redirected.html');
 });
 
+fastify.get('/timeout.html', (req, reply) => {
+  setTimeout(() => reply.send('timeout'), 3000);
+});
+
 let browser;
 
 const runMinimalcss = (path, options = {}) => {
@@ -216,3 +220,13 @@ test('accept CSSO options', async () => {
   ({ finalCss } = await runMinimalcss('comments', { cssoOptions }));
   expect(finalCss).not.toMatch('test css comment');
 });
+
+test('timeout', async () => {
+  expect.assertions(2);
+  try {
+    await runMinimalcss('timeout', { timeout: 2000 });
+  } catch (e) {
+    expect(e.message).toMatch('Navigation Timeout Exceeded: 2000ms exceeded');
+    expect(e.message).toMatch('On one of the following request: http://localhost:3000/timeout.html');
+  }
+});