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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}`;
};
// 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);
});
};
})();
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