diff options
Diffstat (limited to 'devtools/client/framework/browser-toolbox/Launcher.sys.mjs')
| -rw-r--r-- | devtools/client/framework/browser-toolbox/Launcher.sys.mjs | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/devtools/client/framework/browser-toolbox/Launcher.sys.mjs b/devtools/client/framework/browser-toolbox/Launcher.sys.mjs new file mode 100644 index 0000000000..a619fbdff2 --- /dev/null +++ b/devtools/client/framework/browser-toolbox/Launcher.sys.mjs @@ -0,0 +1,467 @@ +/* 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"; + +// Keep this synchronized with the value of the same name in +// toolkit/xre/nsAppRunner.cpp. +const BROWSER_TOOLBOX_WINDOW_URL = + "chrome://devtools/content/framework/browser-toolbox/window.html"; +const CHROME_DEBUGGER_PROFILE_NAME = "chrome_debugger_profile"; + +import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs"; +import { require } from "resource://devtools/shared/loader/Loader.sys.mjs"; +import { + useDistinctSystemPrincipalLoader, + releaseDistinctSystemPrincipalLoader, +} from "resource://devtools/shared/loader/DistinctSystemPrincipalLoader.sys.mjs"; +import { Subprocess } from "resource://gre/modules/Subprocess.sys.mjs"; +import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"; + +const lazy = {}; +ChromeUtils.defineESModuleGetters(lazy, { + BackgroundTasksUtils: "resource://gre/modules/BackgroundTasksUtils.sys.mjs", +}); + +XPCOMUtils.defineLazyServiceGetters(lazy, { + XreDirProvider: [ + "@mozilla.org/xre/directory-provider;1", + "nsIXREDirProvider", + ], +}); + +const Telemetry = require("resource://devtools/client/shared/telemetry.js"); +const EventEmitter = require("resource://devtools/shared/event-emitter.js"); + +const processes = new Set(); + +/** + * @typedef {Object} BrowserToolboxLauncherArgs + * @property {function} onRun - A function called when the process starts running. + * @property {boolean} overwritePreferences - Set to force overwriting the toolbox + * profile's preferences with the current set of preferences. + * @property {boolean} forceMultiprocess - Set to force the Browser Toolbox to be in + * multiprocess mode. + */ + +export class BrowserToolboxLauncher extends EventEmitter { + /** + * Initializes and starts a chrome toolbox process if the appropriated prefs are enabled + * + * @param {BrowserToolboxLauncherArgs} args + * @return {BrowserToolboxLauncher|null} The created instance, or null if the required prefs + * are not set. + */ + static init(args) { + if ( + !Services.prefs.getBoolPref("devtools.chrome.enabled") || + !Services.prefs.getBoolPref("devtools.debugger.remote-enabled") + ) { + console.error("Could not start Browser Toolbox, you need to enable it."); + return null; + } + return new BrowserToolboxLauncher(args); + } + + /** + * Figure out if there are any open Browser Toolboxes that'll need to be restored. + * @return {boolean} + */ + static getBrowserToolboxSessionState() { + return processes.size !== 0; + } + + #closed; + #devToolsServer; + #dbgProfilePath; + #dbgProcess; + #listener; + #loader; + #port; + #telemetry = new Telemetry(); + + /** + * Constructor for creating a process that will hold a chrome toolbox. + * + * @param {...BrowserToolboxLauncherArgs} args + */ + constructor({ forceMultiprocess, onRun, overwritePreferences } = {}) { + super(); + + if (onRun) { + this.once("run", onRun); + } + + this.close = this.close.bind(this); + Services.obs.addObserver(this.close, "quit-application"); + this.#initServer(); + this.#initProfile(overwritePreferences); + this.#create({ forceMultiprocess }); + + processes.add(this); + } + + /** + * Initializes the devtools server. + */ + #initServer() { + if (this.#devToolsServer) { + dumpn("The chrome toolbox server is already running."); + return; + } + + dumpn("Initializing the chrome toolbox server."); + + // Create a separate loader instance, so that we can be sure to receive a + // separate instance of the DebuggingServer from the rest of the devtools. + // This allows us to safely use the tools against even the actors and + // DebuggingServer itself, especially since we can mark this loader as + // invisible to the debugger (unlike the usual loader settings). + this.#loader = useDistinctSystemPrincipalLoader(this); + const { DevToolsServer } = this.#loader.require( + "resource://devtools/server/devtools-server.js" + ); + const { SocketListener } = this.#loader.require( + "resource://devtools/shared/security/socket.js" + ); + this.#devToolsServer = DevToolsServer; + dumpn("Created a separate loader instance for the DevToolsServer."); + + this.#devToolsServer.init(); + // We mainly need a root actor and target actors for opening a toolbox, even + // against chrome/content. But the "no auto hide" button uses the + // preference actor, so also register the browser actors. + this.#devToolsServer.registerAllActors(); + this.#devToolsServer.allowChromeProcess = true; + dumpn("initialized and added the browser actors for the DevToolsServer."); + + const bts = Cc["@mozilla.org/backgroundtasks;1"]?.getService( + Ci.nsIBackgroundTasks + ); + if (bts?.isBackgroundTaskMode) { + // A special root actor, just for background tasks invoked with + // `--backgroundtask TASK --jsdebugger`. + const { createRootActor } = this.#loader.require( + "resource://gre/modules/backgroundtasks/dbg-actors.js" + ); + this.#devToolsServer.setRootActor(createRootActor); + } + + const chromeDebuggingWebSocket = Services.prefs.getBoolPref( + "devtools.debugger.chrome-debugging-websocket" + ); + const socketOptions = { + fromBrowserToolbox: true, + portOrPath: -1, + webSocket: chromeDebuggingWebSocket, + }; + const listener = new SocketListener(this.#devToolsServer, socketOptions); + listener.open(); + this.#listener = listener; + this.#port = listener.port; + + if (!this.#port) { + throw new Error("No devtools server port"); + } + + dumpn("Finished initializing the chrome toolbox server."); + dump( + `DevTools Server for Browser Toolbox listening on port: ${this.#port}\n` + ); + } + + /** + * Initializes a profile for the remote debugger process. + */ + #initProfile(overwritePreferences) { + dumpn("Initializing the chrome toolbox user profile."); + + const bts = Cc["@mozilla.org/backgroundtasks;1"]?.getService( + Ci.nsIBackgroundTasks + ); + + let debuggingProfileDir = Services.dirsvc.get("ProfD", Ci.nsIFile); + if (bts?.isBackgroundTaskMode) { + // Background tasks run with a temporary ephemeral profile. We move the + // browser toolbox profile out of that ephemeral profile so that it has + // alonger life then the background task profile. This preserves + // breakpoints, etc, across repeated debugging invocations. This + // directory is close to the background task temporary profile name(s), + // but doesn't match the prefix that will get purged by the stale + // ephemeral profile cleanup mechanism. + // + // For example, the invocation + // `firefox --backgroundtask success --jsdebugger --wait-for-jsdebugger` + // might run with ephemeral profile + // `/tmp/MozillaBackgroundTask-<HASH>-success` + // and sibling directory browser toolbox profile + // `/tmp/MozillaBackgroundTask-<HASH>-chrome_debugger_profile-success` + // + // See `BackgroundTasks::Shutdown` for ephemeral profile cleanup details. + debuggingProfileDir = debuggingProfileDir.parent; + debuggingProfileDir.append( + `${Services.appinfo.vendor}BackgroundTask-` + + `${lazy.XreDirProvider.getInstallHash()}-${CHROME_DEBUGGER_PROFILE_NAME}-${bts.backgroundTaskName()}` + ); + } else { + debuggingProfileDir.append(CHROME_DEBUGGER_PROFILE_NAME); + } + try { + debuggingProfileDir.create(Ci.nsIFile.DIRECTORY_TYPE, 0o755); + } catch (ex) { + if (ex.result === Cr.NS_ERROR_FILE_ALREADY_EXISTS) { + if (!overwritePreferences) { + this.#dbgProfilePath = debuggingProfileDir.path; + return; + } + // Fall through and copy the current set of prefs to the profile. + } else { + dumpn("Error trying to create a profile directory, failing."); + dumpn("Error: " + (ex.message || ex)); + return; + } + } + + this.#dbgProfilePath = debuggingProfileDir.path; + + // We would like to copy prefs into this new profile... + const prefsFile = debuggingProfileDir.clone(); + prefsFile.append("prefs.js"); + + if (bts?.isBackgroundTaskMode) { + // Background tasks run under a temporary profile. In order to set + // preferences for the launched browser toolbox, take the preferences from + // the default profile. This is the standard pattern for controlling + // background task settings. Without this, there'd be no way to increase + // logging in the browser toolbox process, etc. + const defaultProfile = lazy.BackgroundTasksUtils.getDefaultProfile(); + if (!defaultProfile) { + throw new Error( + "Cannot start Browser Toolbox from background task with no default profile" + ); + } + + const defaultPrefsFile = defaultProfile.rootDir.clone(); + defaultPrefsFile.append("prefs.js"); + defaultPrefsFile.copyTo(prefsFile.parent, prefsFile.leafName); + + dumpn( + `Copied browser toolbox prefs at '${prefsFile.path}'` + + ` from default profiles prefs at '${defaultPrefsFile.path}'` + ); + } else { + // ... but unfortunately, when we run tests, it seems the starting profile + // clears out the prefs file before re-writing it, and in practice the + // file is empty when we get here. So just copying doesn't work in that + // case. + // We could force a sync pref flush and then copy it... but if we're doing + // that, we might as well just flush directly to the new profile, which + // always works: + Services.prefs.savePrefFile(prefsFile); + } + + dumpn( + "Finished creating the chrome toolbox user profile at: " + + this.#dbgProfilePath + ); + } + + /** + * Creates and initializes the profile & process for the remote debugger. + * + * @param {Object} options + * @param {boolean} options.forceMultiprocess: Set to true to force the Browser Toolbox to be in + * multiprocess mode. + */ + #create({ forceMultiprocess } = {}) { + dumpn("Initializing chrome debugging process."); + + let command = Services.dirsvc.get("XREExeF", Ci.nsIFile).path; + let profilePath = this.#dbgProfilePath; + + // MOZ_BROWSER_TOOLBOX_BINARY is an absolute file path to a custom firefox binary. + // This is especially useful when debugging debug builds which are really slow + // so that you could pass an optimized build for the browser toolbox. + // This is also useful when debugging a patch that break devtools, + // so that you could use a build that works for the browser toolbox. + const customBinaryPath = Services.env.get("MOZ_BROWSER_TOOLBOX_BINARY"); + if (customBinaryPath) { + command = customBinaryPath; + profilePath = PathUtils.join(PathUtils.tempDir, "browserToolboxProfile"); + } + + dumpn("Running chrome debugging process."); + const args = [ + "-no-remote", + "-foreground", + "-profile", + profilePath, + "-chrome", + BROWSER_TOOLBOX_WINDOW_URL, + ]; + + const isInputContextEnabled = Services.prefs.getBoolPref( + "devtools.webconsole.input.context", + false + ); + const environment = { + // Allow recording the startup of the browser toolbox when setting + // MOZ_BROWSER_TOOLBOX_PROFILER_STARTUP=1 when running firefox. + MOZ_PROFILER_STARTUP: Services.env.get( + "MOZ_BROWSER_TOOLBOX_PROFILER_STARTUP" + ), + // And prevent profiling any subsequent toolbox + MOZ_BROWSER_TOOLBOX_PROFILER_STARTUP: "0", + + MOZ_BROWSER_TOOLBOX_FORCE_MULTIPROCESS: forceMultiprocess ? "1" : "0", + // Similar, but for the WebConsole input context dropdown. + MOZ_BROWSER_TOOLBOX_INPUT_CONTEXT: isInputContextEnabled ? "1" : "0", + // Disable safe mode for the new process in case this was opened via the + // keyboard shortcut. + MOZ_DISABLE_SAFE_MODE_KEY: "1", + MOZ_BROWSER_TOOLBOX_PORT: String(this.#port), + MOZ_HEADLESS: null, + // Never enable Marionette for the new process. + MOZ_MARIONETTE: null, + // Don't inherit debug settings from the process launching us. This can + // cause errors when log files collide. + MOZ_LOG: null, + MOZ_LOG_FILE: null, + XPCOM_MEM_BLOAT_LOG: null, + XPCOM_MEM_LEAK_LOG: null, + XPCOM_MEM_LOG_CLASSES: null, + XPCOM_MEM_REFCNT_LOG: null, + XRE_PROFILE_PATH: null, + XRE_PROFILE_LOCAL_PATH: null, + }; + + // During local development, incremental builds can trigger the main process + // to clear its startup cache with the "flag file" .purgecaches, but this + // file is removed during app startup time, so we aren't able to know if it + // was present in order to also clear the child profile's startup cache as + // well. + // + // As an approximation of "isLocalBuild", check for an unofficial build. + if (!AppConstants.MOZILLA_OFFICIAL) { + args.push("-purgecaches"); + } + + dump(`Starting Browser Toolbox ${command} ${args.join(" ")}\n`); + IOUtils.makeDirectory(profilePath, { ignoreExisting: true }) + .then(() => + Subprocess.call({ + command, + arguments: args, + environmentAppend: true, + stderr: "stdout", + environment, + }) + ) + .then(proc => { + this.#dbgProcess = proc; + + this.#telemetry.toolOpened("jsbrowserdebugger", this); + + dumpn("Chrome toolbox is now running..."); + this.emit("run", this, proc, this.#dbgProfilePath); + + proc.stdin.close(); + const dumpPipe = async pipe => { + let leftover = ""; + let data = await pipe.readString(); + while (data) { + data = leftover + data; + const lines = data.split(/\r\n|\r|\n/); + if (lines.length) { + for (const line of lines.slice(0, -1)) { + dump(`${proc.pid}> ${line}\n`); + } + leftover = lines[lines.length - 1]; + } + data = await pipe.readString(); + } + if (leftover) { + dump(`${proc.pid}> ${leftover}\n`); + } + }; + dumpPipe(proc.stdout); + + proc.wait().then(() => this.close()); + + return proc; + }) + .catch(err => { + console.log( + `Error loading Browser Toolbox: ${command} ${args.join(" ")}`, + err + ); + }); + } + + /** + * Closes the remote debugging server and kills the toolbox process. + */ + async close() { + if (this.#closed) { + return; + } + + this.#closed = true; + + dumpn("Cleaning up the chrome debugging process."); + + Services.obs.removeObserver(this.close, "quit-application"); + + // We tear down before killing the browser toolbox process to avoid leaking + // socket connection objects. + if (this.#listener) { + this.#listener.close(); + } + + // Note that the DevToolsServer can be shared with the DevToolsServer + // spawned by DevToolsFrameChild. We shouldn't destroy it from here. + // Instead we should let it auto-destroy itself once the last connection is closed. + this.#devToolsServer = null; + + this.#dbgProcess.stdout.close(); + await this.#dbgProcess.kill(); + + this.#telemetry.toolClosed("jsbrowserdebugger", this); + + dumpn("Chrome toolbox is now closed..."); + processes.delete(this); + + this.#dbgProcess = null; + if (this.#loader) { + releaseDistinctSystemPrincipalLoader(this); + } + this.#loader = null; + this.#telemetry = null; + } +} + +/** + * Helper method for debugging. + * @param string + */ +function dumpn(str) { + if (wantLogging) { + dump("DBG-FRONTEND: " + str + "\n"); + } +} + +var wantLogging = Services.prefs.getBoolPref("devtools.debugger.log"); +const prefObserver = { + observe: (...args) => { + wantLogging = Services.prefs.getBoolPref(args.pop()); + }, +}; +Services.prefs.addObserver("devtools.debugger.log", prefObserver); +const unloadObserver = function (subject) { + if (subject.wrappedJSObject == require("@loader/unload")) { + Services.prefs.removeObserver("devtools.debugger.log", prefObserver); + Services.obs.removeObserver(unloadObserver, "devtools:loader:destroy"); + } +}; +Services.obs.addObserver(unloadObserver, "devtools:loader:destroy"); |