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feat(Page): introduce workers (#2560)

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This adds `page.workers()`, and two events `workercreated` and `workerdestroyed`. It also forwards logs from a worker into the page `console` event.

Only dedicated workers are supported for now, ServiceWorkers will probably work differently because they aren't necessarily associated with a single page.

Fixes #2350.
This commit is contained in:
Joel Einbinder
2018-05-21 14:31:11 -07:00
committed by Andrey Lushnikov
parent b474f2ce87
commit 93fe2b57d6
9 changed files with 228 additions and 7 deletions
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14
test/assets/worker/worker.html Normal file
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@@ -0,0 +1,14 @@
<!DOCTYPE html>
<html>
<head>
<title>Worker test</title>
</head>
<body>
<script>
var worker = new Worker('worker.js');
worker.onmessage = function(message) {
console.log(message.data);
};
</script>
</body>
</html>

16
test/assets/worker/worker.js Normal file
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@@ -0,0 +1,16 @@
console.log('hello from the worker');
function workerFunction() {
return 'worker function result';
}
self.addEventListener('message', event => {
console.log('got this data: ' + event.data);
});
(async function() {
while (true) {
self.postMessage(workerFunction.toString());
await new Promise(x => setTimeout(x, 100));
}
})();

27
test/page.spec.js
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@@ -1611,6 +1611,33 @@ module.exports.addTests = function({testRunner, expect, puppeteer, DeviceDescrip
await closedPromise;
});
});
describe('Workers', function() {
it('Page.workers', async function({page, server}) {
await page.goto(server.PREFIX + '/worker/worker.html');
await page.waitForFunction(() => !!worker);
const worker = page.workers()[0];
expect(worker.url()).toContain('worker.js');
const executionContext = await worker.executionContext();
expect(await executionContext.evaluate(() => self.workerFunction())).toBe('worker function result');
await page.goto(server.EMPTY_PAGE);
expect(page.workers()).toEqual([]);
});
it('should emit created and destroyed events', async function({page}) {
const workerCreatedPromise = new Promise(x => page.once('workercreated', x));
const workerObj = await page.evaluateHandle(() => new Worker('data:text/javascript,1'));
const worker = await workerCreatedPromise;
const workerDestroyedPromise = new Promise(x => page.once('workerdestroyed', x));
await page.evaluate(workerObj => workerObj.terminate(), workerObj);
expect(await workerDestroyedPromise).toBe(worker);
});
it('should report console logs', async function({page}) {
const logPromise = new Promise(x => page.on('console', x));
await page.evaluate(() => new Worker(`data:text/javascript,console.log(1)`));
const log = await logPromise;
expect(log.text()).toBe('1');
});
});
describe('Page.browser', function() {
it('should return the correct browser instance', async function({ page, browser }) {