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// Test helpers used by multiple Web Locks API tests.
(() => {
// Generate a unique resource identifier, using the script path and
// test case name. This is useful to avoid lock interference between
// test cases.
let res_num = 0;
self.uniqueName = (testCase, prefix) => {
return `${self.location.pathname}-${prefix}-${testCase.name}-${++res_num}`;
};
self.uniqueNameByQuery = () => {
const prefix = new URL(location.href).searchParams.get('prefix');
return `${prefix}-${++res_num}`;
}
// Inject an iframe showing the given url into the page, and resolve
// the returned promise when the frame is loaded.
self.iframe = url => new Promise(resolve => {
const element = document.createElement('iframe');
element.addEventListener(
'load', () => { resolve(element); }, { once: true });
element.src = url;
document.documentElement.appendChild(element);
});
// Post a message to the target frame, and resolve the returned
// promise when a response comes back. The posted data is annotated
// with unique id to track the response. This assumes the use of
// 'iframe.html' as the frame, which implements this protocol.
let next_request_id = 0;
self.postToFrameAndWait = (frame, data) => {
const iframe_window = frame.contentWindow;
data.rqid = next_request_id++;
iframe_window.postMessage(data, '*');
return new Promise(resolve => {
const listener = event => {
if (event.source !== iframe_window || event.data.rqid !== data.rqid)
return;
self.removeEventListener('message', listener);
resolve(event.data);
};
self.addEventListener('message', listener);
});
};
// Post a message to the target worker, and resolve the returned
// promise when a response comes back. The posted data is annotated
// with unique id to track the response. This assumes the use of
// 'worker.js' as the worker, which implements this protocol.
self.postToWorkerAndWait = (worker, data) => {
return new Promise(resolve => {
data.rqid = next_request_id++;
worker.postMessage(data);
const listener = event => {
if (event.data.rqid !== data.rqid)
return;
worker.removeEventListener('message', listener);
resolve(event.data);
};
worker.addEventListener('message', listener);
});
};
/**
* Request a lock and hold it until the subtest ends.
* @param {*} t test runner object
* @param {string} name lock name
* @param {LockOptions=} options lock options
* @returns
*/
self.requestLockAndHold = (t, name, options = {}) => {
let [promise, resolve] = self.makePromiseAndResolveFunc();
const released = navigator.locks.request(name, options, () => promise);
// Add a cleanup function that releases the lock by resolving the promise,
// and then waits until the lock is really released, to avoid contaminating
// following tests with temporarily held locks.
t.add_cleanup(() => {
resolve();
// Cleanup shouldn't fail if the request is aborted.
return released.catch(() => undefined);
});
return released;
};
self.makePromiseAndResolveFunc = () => {
let resolve;
const promise = new Promise(r => { resolve = r; });
return [promise, resolve];
};
})();
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