45eb7e06ce
This commit exposes the Permissions API to DOM Workers. It achieves this goal by introducing a thread-safe bridge between `PermissionStatus` and the `PermissionObserver`: the `PermissionStatusSink` object. Actors: - The `PermissionObserver` is a main-thread-only singleton that monitors permission change events and propagates the notification to the right sink objects. - The `PermissionStatus` is the DOM object exposed to the global. It's not thread-safe. - The `PermissionStatusSink` is the new bridge introduced by this commit. The `PermissionStatusSink` lifetime: - This object is kept alive on the current thread by the `PermissionStatus` and on the main thread by the `PermissionObserver`. - The `PermissionStatus` creates the object on its creation thread. When `PermissionStatus` object is released (or disconnected from the owner, it disentangles itself from the `PermissionStatusSink`. The disentangle operation triggers the un-registration procedure from the `PermissionObserver` on the main thread. - A weak `WorkerRef` is used to monitor the worker's lifetime. Permission change notification: - When the `PermissionObserver` is notified for a permission-change event, it notifies all the `PermissionStatusSink`. This happens on the main thread (see `MaybeUpdatedByOnMainThread` and `MaybeUpdatedByNotifyOnlyOnMainThread`). - Using `MozPromise`, the `PermissionStatusSink` computes the permission action (`PermissionChangedOnMainThread`) on the main thread, then informs the parent `PermissionStatus` object on its creation thread. - The `PermissionStatus` object converts the action to the DOM `PermissionState` and dispatches an event. Differential Revision: https://phabricator.services.mozilla.com/D224594
41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_PermissionObserver_h_
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#define mozilla_dom_PermissionObserver_h_
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#include "nsIObserver.h"
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#include "nsTArray.h"
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#include "nsWeakReference.h"
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namespace mozilla::dom {
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class PermissionStatusSink;
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// Singleton that watches for perm-changed notifications in order to notify
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// PermissionStatus objects.
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class PermissionObserver final : public nsIObserver,
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public nsSupportsWeakReference {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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static already_AddRefed<PermissionObserver> GetInstance();
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void AddSink(PermissionStatusSink* aSink);
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void RemoveSink(PermissionStatusSink* aSink);
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private:
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PermissionObserver();
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virtual ~PermissionObserver();
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nsTArray<RefPtr<PermissionStatusSink>> mSinks;
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};
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} // namespace mozilla::dom
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#endif
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