Greg Stoll
827e603217
This avoids having one of these per window. Differential Revision: https://phabricator.services.mozilla.com/D312072
79 lines
2.9 KiB
JavaScript
79 lines
2.9 KiB
JavaScript
/* 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
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
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// Because of the indirection with which we call into these modules, eslint
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// does not realize which of these modules are used, so we have to disable
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// the relevant lint rule. However, this does mean that when modifying the
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// list of observers or the modules they are associated with, you must be
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// more careful to ensure we remove unused modules.
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/* eslint-disable mozilla/valid-lazy */
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let lazy = {};
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ChromeUtils.defineESModuleGetters(lazy, {
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CanvasPermissionPromptHelper:
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"moz-src:///browser/modules/CanvasPermissionPromptHelper.sys.mjs",
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FilePickerCrashed: "resource:///modules/FilePickerCrashed.sys.mjs",
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PluginManager: "resource:///actors/PluginParent.sys.mjs",
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SerialDeviceSharingHelper:
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"moz-src:///browser/modules/SerialDeviceSharingHelper.sys.mjs",
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WebAuthnPromptHelper:
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"moz-src:///toolkit/modules/WebAuthnPromptHelper.sys.mjs",
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});
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// Map from observer topic to a list of exported objects whose observe()
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// method should be called when the topic is fired. The exported objects
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// are expected to be defined in the modules imported above.
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let gObservers = {
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"canvas-permissions-prompt": ["CanvasPermissionPromptHelper"],
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"canvas-permissions-prompt-hide-doorhanger": ["CanvasPermissionPromptHelper"],
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"file-picker-crashed": ["FilePickerCrashed"],
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"gmp-plugin-crash": ["PluginManager"],
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"plugin-crashed": ["PluginManager"],
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"serial-device-state-changed": ["SerialDeviceSharingHelper"],
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"webauthn-prompt": ["WebAuthnPromptHelper"],
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};
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if (AppConstants.MOZ_UPDATER) {
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ChromeUtils.defineESModuleGetters(lazy, {
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UpdateListener: "resource://gre/modules/UpdateListener.sys.mjs",
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});
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gObservers["update-downloading"] = ["UpdateListener"];
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gObservers["update-staged"] = ["UpdateListener"];
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gObservers["update-downloaded"] = ["UpdateListener"];
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gObservers["update-available"] = ["UpdateListener"];
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gObservers["update-error"] = ["UpdateListener"];
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gObservers["update-swap"] = ["UpdateListener"];
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}
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/**
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* Utility to avoid eagerly loading modules that are only needed
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* once a given observer topic is fired. Note that in an ideal world,
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* these observers would be added in parts of the same component that
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* are already loaded at startup, but not all components have such code.
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*
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* This module exists to avoid each component having to reinvent that wheel.
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*/
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export const ObserverForwarder = {
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init() {
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for (const topic of Object.keys(gObservers)) {
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Services.obs.addObserver(this, topic);
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}
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},
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observe(subject, topic, data) {
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for (let objectName of gObservers[topic]) {
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try {
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lazy[objectName].observe(subject, topic, data);
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} catch (e) {
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console.error(e);
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}
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}
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},
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};
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