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