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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {
TYPES: { EXTENSIONS_BGSCRIPT_STATUS },
} = require("resource://devtools/server/actors/resources/index.js");
class ExtensionsBackgroundScriptStatusWatcher {
/**
* Start watching for the status updates related to a background
* scripts extension context (either an event page or a background
* service worker).
*
* This is used in about:debugging to update the background script
* row updated visible in Extensions details cards (only for extensions
* with a non persistent background script defined in the manifest)
* when the background contex is terminated on idle or started back
* to handle a persistent WebExtensions API event.
*
* @param RootActor rootActor
* The root actor in the parent process from which we should
* observe root resources.
* @param Object options
* Dictionary object with following attributes:
* - onAvailable: mandatory function
* This will be called for each resource.
*/
async watch(rootActor, { onAvailable }) {
this.rootActor = rootActor;
this.onAvailable = onAvailable;
Services.obs.addObserver(this, "extension:background-script-status");
}
observe(subject, topic, data) {
switch (topic) {
case "extension:background-script-status": {
const { addonId, isRunning } = subject.wrappedJSObject;
this.onBackgroundScriptStatus(addonId, isRunning);
break;
}
}
}
onBackgroundScriptStatus(addonId, isRunning) {
this.onAvailable([
{
resourceType: EXTENSIONS_BGSCRIPT_STATUS,
payload: {
addonId,
isRunning,
},
},
]);
}
destroy() {
if (this.onAvailable) {
this.onAvailable = null;
Services.obs.removeObserver(this, "extension:background-script-status");
}
}
}
module.exports = ExtensionsBackgroundScriptStatusWatcher;
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