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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This class cooperates with blink_perf.py to perform actions. Currently only
// stopping service workers is supported.
class ServiceWorkerPerfTools {
constructor() {
this.actionDoneCallback = null;
this.actionRequired = false;
this.action = null;
this.enabled = false;
}
// This should be called before other methods.
enable() {
this.enabled = true;
}
// Call this to stop all service workers. When the returned promise is
// resolved, all service workers are stopped.
stopWorkers() {
return this.performAction('stop-workers');
}
// Call this to notify blink_perf.py to stop waiting for more actions. When
// the returned promise is resolved, blink_perf.py has stopped waiting.
quit() {
return this.performAction('quit');
}
// Called by blink_perf.py after an action has been performed.
notifyActionDone() {
if (!this.actionDoneCallback)
throw new Error('There is no pending action!');
this.actionDoneCallback();
this.actionDoneCallback = null;
this.action = null;
this.actionRequired = false;
}
performAction(action) {
if (!this.enabled) {
throw new TypeError('ServiceWorkerPerfTools is not enabled,' +
' call enable() first!');
}
if (this.actionRequired) {
throw new Error('There is already a pending action:', this.action);
}
const promise = new Promise(resolve => {
this.actionDoneCallback = resolve;
});
this.action = action;
this.actionRequired = true;
return promise;
}
}
window.serviceWorkerPerfTools = new ServiceWorkerPerfTools;
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