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fix(page): fix race condition in WaitTask (#2739)

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This patch eliminates a common race condition with WaitTask, that
happens when predicate function gets resolved right before the execution
context gets destroyed.
This situation results in a "Cannot find context with specified id undefined"
exception.

Credits go to @jakub300 for his wonderful [investigation](https://github.com/GoogleChrome/puppeteer/issues/1325#issuecomment-395472092).

Fixes #1325.
This commit is contained in:
Andrey Lushnikov 2018-06-14 11:39:51 -07:00 committed by GitHub
parent ed7a26cc95
commit ddfdaf97c5
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 1 deletions
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4
lib/FrameManager.js
View File

@ -869,7 +869,9 @@ class WaitTask {
}
// Ignore timeouts in pageScript - we track timeouts ourselves.
if (!error && await this._frame.evaluate(s => !s, success)) {
// If the frame's execution context has already changed, `frame.evaluate` will
// throw an error - ignore this predicate run altogether.
if (!error && await this._frame.evaluate(s => !s, success).catch(e => true)) {
await success.dispose();
return;
}

8
test/frame.spec.js
View File

@ -84,6 +84,14 @@ module.exports.addTests = function({testRunner, expect}) {
await page.evaluate(() => window.__FOO = 1);
await watchdog;
});
it('should work when resolved right before execution context disposal', async({page, server}) => {
await page.evaluateOnNewDocument(() => window.__RELOADED = true);
await page.waitForFunction(() => {
if (!window.__RELOADED)
window.location.reload();
return true;
});
});
it('should poll on interval', async({page, server}) => {
let success = false;
const startTime = Date.now();