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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 { watcherSpec } = require("resource://devtools/shared/specs/watcher.js");
const {
FrontClassWithSpec,
registerFront,
} = require("resource://devtools/shared/protocol.js");
loader.lazyRequireGetter(
this,
"WindowGlobalTargetFront",
"resource://devtools/client/fronts/targets/window-global.js",
true
);
loader.lazyRequireGetter(
this,
"ContentProcessTargetFront",
"resource://devtools/client/fronts/targets/content-process.js",
true
);
loader.lazyRequireGetter(
this,
"WorkerTargetFront",
"resource://devtools/client/fronts/targets/worker.js",
true
);
class WatcherFront extends FrontClassWithSpec(watcherSpec) {
constructor(client, targetFront, parentFront) {
super(client, targetFront, parentFront);
this._onTargetAvailable = this._onTargetAvailable.bind(this);
this._onTargetDestroyed = this._onTargetDestroyed.bind(this);
// Convert form, which is just JSON object to Fronts for these two events
this.on("target-available-form", this._onTargetAvailable);
this.on("target-destroyed-form", this._onTargetDestroyed);
}
form(json) {
this.actorID = json.actor;
this.traits = json.traits;
}
_onTargetAvailable(form) {
let front;
if (form.actor.includes("/contentProcessTarget")) {
front = new ContentProcessTargetFront(this.conn, null, this);
} else if (form.actor.includes("/workerTarget")) {
front = new WorkerTargetFront(this.conn, null, this);
} else {
front = new WindowGlobalTargetFront(this.conn, null, this);
}
front.actorID = form.actor;
front.form(form);
this.manage(front);
this.emit("target-available", front);
}
_onTargetDestroyed(form, options = {}) {
const front = this._getTargetFront(form);
// When server side target switching is off,
// the watcher may notify us about the top level target destruction a bit late.
// The descriptor (`this.parentFront`) already switched to the new target.
// Missing `target-destroyed` isn't critical when target switching is off
// as `TargetCommand.switchToTarget` will end calling `TargetCommand.onTargetDestroyed` for all
// existing targets.
// https://searchfox.org/mozilla-central/rev/af8e5d37fd56be90ccddae2203e7b875d3f3ae87/devtools/shared/commands/target/target-command.js#166-173
if (front) {
this.emit("target-destroyed", front, options);
}
}
_getTargetFront(form) {
let front = this.getActorByID(form.actor);
// For top level target, the target will be a child of the descriptor front,
// which happens to be the parent front of the watcher.
if (!front) {
front = this.parentFront.getActorByID(form.actor);
}
return front;
}
/**
* Retrieve the already existing WindowGlobalTargetFront for the parent
* BrowsingContext of the given BrowsingContext ID.
*/
async getParentWindowGlobalTarget(browsingContextID) {
const id = await this.getParentBrowsingContextID(browsingContextID);
if (!id) {
return null;
}
return this.getWindowGlobalTarget(id);
}
/**
* Memoized getter for the "blackboxing" actor
*/
async getBlackboxingActor() {
if (!this._blackboxingActor) {
this._blackboxingActor = await super.getBlackboxingActor();
}
return this._blackboxingActor;
}
/**
* Memoized getter for the "breakpoint-list" actor
*/
async getBreakpointListActor() {
if (!this._breakpointListActor) {
this._breakpointListActor = await super.getBreakpointListActor();
}
return this._breakpointListActor;
}
/**
* Memoized getter for the "target-configuration" actor
*/
async getTargetConfigurationActor() {
if (!this._targetConfigurationActor) {
this._targetConfigurationActor =
await super.getTargetConfigurationActor();
}
return this._targetConfigurationActor;
}
/**
* Memoized getter for the "thread-configuration" actor
*/
async getThreadConfigurationActor() {
if (!this._threadConfigurationActor) {
this._threadConfigurationActor =
await super.getThreadConfigurationActor();
}
return this._threadConfigurationActor;
}
/**
* For a given BrowsingContext ID, return the already existing WindowGlobalTargetFront
*/
async getWindowGlobalTarget(id) {
// First scan the watcher children as the watcher manages all the targets
for (const front of this.poolChildren()) {
if (front.browsingContextID == id) {
return front;
}
}
// But the top level target will be created by the Descriptor.getTarget() method
// and so be hosted in the Descriptor's pool.
// The parent front of the WatcherActor happens to be the Descriptor Actor.
// This code could go away or be simplified if the Descriptor starts fetch all
// the targets, including the top level one via the Watcher. i.e. drop Descriptor.getTarget().
const topLevelTarget = await this.parentFront.getTarget();
if (topLevelTarget?.browsingContextID == id) {
return topLevelTarget;
}
// If we could not find a window global target for the provided id, the
// window global might not be the topmost one of a given process (isProcessRoot == true).
// For now we only create targets for the top window global of each process,
// so we recursively check the parent browsing context ids
// until we find a valid target.
const parentBrowsingContextID = await this.getParentBrowsingContextID(id);
if (parentBrowsingContextID && parentBrowsingContextID !== id) {
return this.getWindowGlobalTarget(parentBrowsingContextID);
}
return null;
}
getWindowGlobalTargetByInnerWindowId(innerWindowId) {
for (const front of this.poolChildren()) {
if (front.innerWindowId == innerWindowId) {
return front;
}
}
// Use getCachedTarget in order to have a fully synchronous method
// as the callsite in ResourceCommand benefit from being synchronous.
// Here we care only about already existing resource and do not need to
// wait for the next target to come.
const topLevelTarget = this.parentFront.getCachedTarget();
if (topLevelTarget?.innerWindowId == innerWindowId) {
return topLevelTarget;
}
console.error("Unable to find target with innerWindowId:" + innerWindowId);
return null;
}
/**
* Memoized getter for the "networkParent" actor
*/
async getNetworkParentActor() {
if (!this._networkParentActor) {
this._networkParentActor = await super.getNetworkParentActor();
}
return this._networkParentActor;
}
}
registerFront(WatcherFront);
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