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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/. */
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
JSONHandler: "chrome://remote/content/cdp/JSONHandler.sys.mjs",
Log: "chrome://remote/content/shared/Log.sys.mjs",
RecommendedPreferences:
"chrome://remote/content/shared/RecommendedPreferences.sys.mjs",
TargetList: "chrome://remote/content/cdp/targets/TargetList.sys.mjs",
});
XPCOMUtils.defineLazyGetter(lazy, "logger", () =>
lazy.Log.get(lazy.Log.TYPES.CDP)
);
XPCOMUtils.defineLazyGetter(lazy, "textEncoder", () => new TextEncoder());
// Map of CDP-specific preferences that should be set via
// RecommendedPreferences.
const RECOMMENDED_PREFS = new Map([
// Prevent various error message on the console
// jest-puppeteer asserts that no error message is emitted by the console
[
"browser.contentblocking.features.standard",
"-tp,tpPrivate,cookieBehavior0,-cm,-fp",
],
// Accept all cookies (see behavior definitions in nsICookieService.idl)
["network.cookie.cookieBehavior", 0],
]);
/**
* Entry class for the Chrome DevTools Protocol support.
*
* It holds the list of available targets (tabs, main browser), and also
* sets up the necessary handlers for the HTTP server.
*
* @see https://chromedevtools.github.io/devtools-protocol
*/
export class CDP {
/**
* Creates a new instance of the CDP class.
*
* @param {RemoteAgent} agent
* Reference to the Remote Agent instance.
*/
constructor(agent) {
this.agent = agent;
this.targetList = null;
this._running = false;
this._activePortPath;
}
get address() {
const mainTarget = this.targetList.getMainProcessTarget();
return mainTarget.wsDebuggerURL;
}
get mainTargetPath() {
const mainTarget = this.targetList.getMainProcessTarget();
return mainTarget.path;
}
/**
* Starts the CDP support.
*/
async start() {
if (this._running) {
return;
}
// Note: Ideally this would only be set at the end of the method. However
// since start() is async, we prefer to set the flag early in order to
// avoid potential race conditions.
this._running = true;
lazy.RecommendedPreferences.applyPreferences(RECOMMENDED_PREFS);
// Starting CDP too early can cause issues with clients in not being able
// to find any available target. Also when closing the application while
// it's still starting up can cause shutdown hangs. As such CDP will be
// started when the initial application window has finished initializing.
lazy.logger.debug(`Waiting for initial application window`);
await this.agent.browserStartupFinished;
this.agent.server.registerPrefixHandler("/", new lazy.JSONHandler(this));
this.targetList = new lazy.TargetList();
this.targetList.on("target-created", (eventName, target) => {
this.agent.server.registerPathHandler(target.path, target);
});
this.targetList.on("target-destroyed", (eventName, target) => {
this.agent.server.registerPathHandler(target.path, null);
});
await this.targetList.watchForTargets();
Cu.printStderr(`DevTools listening on ${this.address}\n`);
// Write connection details to DevToolsActivePort file within the profile.
this._activePortPath = PathUtils.join(
PathUtils.profileDir,
"DevToolsActivePort"
);
const data = `${this.agent.port}\n${this.mainTargetPath}`;
try {
await IOUtils.write(this._activePortPath, lazy.textEncoder.encode(data));
} catch (e) {
lazy.logger.warn(
`Failed to create ${this._activePortPath} (${e.message})`
);
}
}
/**
* Stops the CDP support.
*/
async stop() {
if (!this._running) {
return;
}
try {
await IOUtils.remove(this._activePortPath);
} catch (e) {
lazy.logger.warn(
`Failed to remove ${this._activePortPath} (${e.message})`
);
}
try {
this.targetList?.destructor();
this.targetList = null;
lazy.RecommendedPreferences.restorePreferences(RECOMMENDED_PREFS);
} catch (e) {
lazy.logger.error("Failed to stop protocol", e);
} finally {
this._running = false;
}
}
}
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