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| -rw-r--r-- | devtools/server/actors/watcher.js | 770 |
1 files changed, 770 insertions, 0 deletions
diff --git a/devtools/server/actors/watcher.js b/devtools/server/actors/watcher.js new file mode 100644 index 0000000000..379afe8c4e --- /dev/null +++ b/devtools/server/actors/watcher.js @@ -0,0 +1,770 @@ +/* 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 protocol = require("resource://devtools/shared/protocol.js"); +const { watcherSpec } = require("resource://devtools/shared/specs/watcher.js"); + +const Resources = require("resource://devtools/server/actors/resources/index.js"); +const { TargetActorRegistry } = ChromeUtils.importESModule( + "resource://devtools/server/actors/targets/target-actor-registry.sys.mjs" +); +const { WatcherRegistry } = ChromeUtils.importESModule( + "resource://devtools/server/actors/watcher/WatcherRegistry.sys.mjs", + { + // WatcherRegistry needs to be a true singleton and loads ActorManagerParent + // which also has to be a true singleton. + loadInDevToolsLoader: false, + } +); +const Targets = require("resource://devtools/server/actors/targets/index.js"); +const { getAllBrowsingContextsForContext } = ChromeUtils.importESModule( + "resource://devtools/server/actors/watcher/browsing-context-helpers.sys.mjs" +); + +const TARGET_HELPERS = {}; +loader.lazyRequireGetter( + TARGET_HELPERS, + Targets.TYPES.FRAME, + "resource://devtools/server/actors/watcher/target-helpers/frame-helper.js" +); +loader.lazyRequireGetter( + TARGET_HELPERS, + Targets.TYPES.PROCESS, + "resource://devtools/server/actors/watcher/target-helpers/process-helper.js" +); +loader.lazyRequireGetter( + TARGET_HELPERS, + Targets.TYPES.WORKER, + "resource://devtools/server/actors/watcher/target-helpers/worker-helper.js" +); + +loader.lazyRequireGetter( + this, + "NetworkParentActor", + "resource://devtools/server/actors/network-monitor/network-parent.js", + true +); +loader.lazyRequireGetter( + this, + "BlackboxingActor", + "resource://devtools/server/actors/blackboxing.js", + true +); +loader.lazyRequireGetter( + this, + "BreakpointListActor", + "resource://devtools/server/actors/breakpoint-list.js", + true +); +loader.lazyRequireGetter( + this, + "TargetConfigurationActor", + "resource://devtools/server/actors/target-configuration.js", + true +); +loader.lazyRequireGetter( + this, + "ThreadConfigurationActor", + "resource://devtools/server/actors/thread-configuration.js", + true +); + +exports.WatcherActor = protocol.ActorClassWithSpec(watcherSpec, { + /** + * Initialize a new WatcherActor which is the main entry point to debug + * something. The main features of this actor are to: + * - observe targets related to the context we are debugging. + * This is done via watchTargets/unwatchTargets methods, and + * target-available-form/target-destroyed-form events. + * - observe resources related to the observed targets. + * This is done via watchResources/unwatchResources methods, and + * resource-available-form/resource-updated-form/resource-destroyed-form events. + * Note that these events are also emited on both the watcher actor, + * for resources observed from the parent process, as well as on the + * target actors, when the resources are observed from the target's process or thread. + * + * @param {DevToolsServerConnection} conn + * The connection to use in order to communicate back to the client. + * @param {object} sessionContext + * The Session Context to help know what is debugged. + * See devtools/server/actors/watcher/session-context.js + * @param {Number} sessionContext.browserId: If this is a "browser-element" context type, + * the "browserId" of the <browser> element we would like to debug. + * @param {Boolean} sessionContext.isServerTargetSwitchingEnabled: Flag to to know if we should + * spawn new top level targets for the debugged context. + */ + initialize(conn, sessionContext) { + protocol.Actor.prototype.initialize.call(this, conn); + this._sessionContext = sessionContext; + if (sessionContext.type == "browser-element") { + // Retrieve the <browser> element for the given browser ID + const browsingContext = BrowsingContext.getCurrentTopByBrowserId( + sessionContext.browserId + ); + if (!browsingContext) { + throw new Error( + "Unable to retrieve the <browser> element for browserId=" + + sessionContext.browserId + ); + } + this._browserElement = browsingContext.embedderElement; + } + + // Sometimes we get iframe targets before the top-level targets + // mostly when doing bfcache navigations, lets cache the early iframes targets and + // flush them after the top-level target is available. See Bug 1726568 for details. + this._earlyIframeTargets = {}; + + // All currently available WindowGlobal target's form, keyed by `innerWindowId`. + // + // This helps to: + // - determine if the iframe targets are early or not. + // i.e. if it is notified before its parent target is available. + // - notify the destruction of all children targets when a parent is destroyed. + // i.e. have a reliable order of destruction between parent and children. + // + // Note that there should be just one top-level window target at a time, + // but there are certain cases when a new target is available before the + // old target is destroyed. + this._currentWindowGlobalTargets = new Map(); + }, + + get sessionContext() { + return this._sessionContext; + }, + + /** + * If we are debugging only one Tab or Document, returns its BrowserElement. + * For Tabs, it will be the <browser> element used to load the web page. + * + * This is typicaly used to fetch: + * - its `browserId` attribute, which uniquely defines it, + * - its `browsingContextID` or `browsingContext`, which helps inspecting its content. + */ + get browserElement() { + return this._browserElement; + }, + + getAllBrowsingContexts(options) { + return getAllBrowsingContextsForContext(this.sessionContext, options); + }, + + /** + * Helper to know if the context we are debugging has been already destroyed + */ + isContextDestroyed() { + if (this.sessionContext.type == "browser-element") { + return !this.browserElement.browsingContext; + } else if (this.sessionContext.type == "webextension") { + return !BrowsingContext.get(this.sessionContext.addonBrowsingContextID); + } else if (this.sessionContext.type == "all") { + return false; + } + throw new Error( + "Unsupported session context type: " + this.sessionContext.type + ); + }, + + destroy() { + // Force unwatching for all types, even if we weren't watching. + // This is fine as unwatchTarget is NOOP if we weren't already watching for this target type. + for (const targetType of Object.values(Targets.TYPES)) { + this.unwatchTargets(targetType); + } + this.unwatchResources(Object.values(Resources.TYPES)); + + WatcherRegistry.unregisterWatcher(this); + + // Destroy the actor at the end so that its actorID keeps being defined. + protocol.Actor.prototype.destroy.call(this); + }, + + /* + * Get the list of the currently watched resources for this watcher. + * + * @return Array<String> + * Returns the list of currently watched resource types. + */ + get sessionData() { + return WatcherRegistry.getSessionData(this); + }, + + form() { + return { + actor: this.actorID, + // The resources and target traits should be removed all at the same time since the + // client has generic ways to deal with all of them (See Bug 1680280). + traits: { + ...this.sessionContext.supportedTargets, + resources: this.sessionContext.supportedResources, + }, + }; + }, + + /** + * Start watching for a new target type. + * + * This will instantiate Target Actors for existing debugging context of this type, + * but will also create actors as context of this type get created. + * The actors are notified to the client via "target-available-form" RDP events. + * We also notify about target actors destruction via "target-destroyed-form". + * Note that we are guaranteed to receive all existing target actor by the time this method + * resolves. + * + * @param {string} targetType + * Type of context to observe. See Targets.TYPES object. + */ + async watchTargets(targetType) { + WatcherRegistry.watchTargets(this, targetType); + + const targetHelperModule = TARGET_HELPERS[targetType]; + // Await the registration in order to ensure receiving the already existing targets + await targetHelperModule.createTargets(this); + }, + + /** + * Stop watching for a given target type. + * + * @param {string} targetType + * Type of context to observe. See Targets.TYPES object. + * @param {object} options + * @param {boolean} options.isModeSwitching + * true when this is called as the result of a change to the devtools.browsertoolbox.scope pref + */ + unwatchTargets(targetType, options = {}) { + const isWatchingTargets = WatcherRegistry.unwatchTargets( + this, + targetType, + options + ); + if (!isWatchingTargets) { + return; + } + + const targetHelperModule = TARGET_HELPERS[targetType]; + targetHelperModule.destroyTargets(this, options); + + // Unregister the JS Window Actor if there is no more DevTools code observing any target/resource, + // unless we're switching mode (having both condition at the same time should only + // happen in tests). + if (!options.isModeSwitching) { + WatcherRegistry.maybeUnregisteringJSWindowActor(); + } + }, + + /** + * Flush any early iframe targets relating to this top level + * window target. + * @param {number} topInnerWindowID + */ + _flushIframeTargets(topInnerWindowID) { + while (this._earlyIframeTargets[topInnerWindowID]?.length > 0) { + const actor = this._earlyIframeTargets[topInnerWindowID].shift(); + this.emit("target-available-form", actor); + } + }, + + /** + * Called by a Watcher module, whenever a new target is available + */ + notifyTargetAvailable(actor) { + // Emit immediately for worker, process & extension targets + // as they don't have a parent browsing context. + if (!actor.traits?.isBrowsingContext) { + this.emit("target-available-form", actor); + return; + } + + // If isBrowsingContext trait is true, we are processing a WindowGlobalTarget. + // (this trait should be renamed) + this._currentWindowGlobalTargets.set(actor.innerWindowId, actor); + + // The top-level is always the same for the browser-toolbox + if (this.sessionContext.type == "all") { + this.emit("target-available-form", actor); + return; + } + + if (actor.isTopLevelTarget) { + this.emit("target-available-form", actor); + // Flush any existing early iframe targets + this._flushIframeTargets(actor.innerWindowId); + } else if (this._currentWindowGlobalTargets.has(actor.topInnerWindowId)) { + // Emit the event immediately if the top-level target is already available + this.emit("target-available-form", actor); + } else if (this._earlyIframeTargets[actor.topInnerWindowId]) { + // Add the early iframe target to the list of other early targets. + this._earlyIframeTargets[actor.topInnerWindowId].push(actor); + } else { + // Set the first early iframe target + this._earlyIframeTargets[actor.topInnerWindowId] = [actor]; + } + }, + + /** + * Called by a Watcher module, whenever a target has been destroyed + * + * @param {object} actor + * the actor form of the target being destroyed + * @param {object} options + * @param {boolean} options.isModeSwitching + * true when this is called as the result of a change to the devtools.browsertoolbox.scope pref + */ + async notifyTargetDestroyed(actor, options = {}) { + // Emit immediately for worker, process & extension targets + // as they don't have a parent browsing context. + if (!actor.innerWindowId) { + this.emit("target-destroyed-form", actor, options); + return; + } + // Flush all iframe targets if we are destroying a top level target. + if (actor.isTopLevelTarget) { + // First compute the list of children actors, as notifyTargetDestroy will mutate _currentWindowGlobalTargets + const childrenActors = [ + ...this._currentWindowGlobalTargets.values(), + ].filter( + form => + form.topInnerWindowId == actor.innerWindowId && + // Ignore the top level target itself, because its topInnerWindowId will be its innerWindowId + form.innerWindowId != actor.innerWindowId + ); + childrenActors.map(form => this.notifyTargetDestroyed(form, options)); + } + if (this._earlyIframeTargets[actor.innerWindowId]) { + delete this._earlyIframeTargets[actor.innerWindowId]; + } + this._currentWindowGlobalTargets.delete(actor.innerWindowId); + const documentEventWatcher = Resources.getResourceWatcher( + this, + Resources.TYPES.DOCUMENT_EVENT + ); + // If we have a Watcher class instantiated, ensure that target-destroyed is sent + // *after* DOCUMENT_EVENT's will-navigate. Otherwise this resource will have an undefined + // `targetFront` attribute, as it is associated with the target from which we navigate + // and not the one we navigate to. + // + // About documentEventWatcher check: We won't have any watcher class if we aren't + // using server side Watcher classes. + // i.e. when we are using the legacy listener for DOCUMENT_EVENT. + // This is still the case for all toolboxes but the one for local and remote tabs. + // + // About isServerTargetSwitchingEnabled check: if we are using the watcher class + // we may still use client side target, which will still use legacy listeners for + // will-navigate and so will-navigate will be emitted by the target actor itself. + // + // About isTopLevelTarget check: only top level targets emit will-navigate, + // so there is no reason to delay target-destroy for remote iframes. + if ( + documentEventWatcher && + this.sessionContext.isServerTargetSwitchingEnabled && + actor.isTopLevelTarget + ) { + await documentEventWatcher.onceWillNavigateIsEmitted(actor.innerWindowId); + } + this.emit("target-destroyed-form", actor, options); + }, + + /** + * Given a browsingContextID, returns its parent browsingContextID. Returns null if a + * parent browsing context couldn't be found. Throws if the browsing context + * corresponding to the passed browsingContextID couldn't be found. + * + * @param {Integer} browsingContextID + * @returns {Integer|null} + */ + getParentBrowsingContextID(browsingContextID) { + const browsingContext = BrowsingContext.get(browsingContextID); + if (!browsingContext) { + throw new Error( + `BrowsingContext with ID=${browsingContextID} doesn't exist.` + ); + } + // Top-level documents of tabs, loaded in a <browser> element expose a null `parent`. + // i.e. Their BrowsingContext has no parent and is considered top level. + // But... in the context of the Browser Toolbox, we still consider them as child of the browser window. + // So, for them, fallback on `embedderWindowGlobal`, which will typically be the WindowGlobal for browser.xhtml. + if (browsingContext.parent) { + return browsingContext.parent.id; + } + if (browsingContext.embedderWindowGlobal) { + return browsingContext.embedderWindowGlobal.browsingContext.id; + } + return null; + }, + + /** + * Called by Resource Watchers, when new resources are available, updated or destroyed. + * + * @param String updateType + * Can be "available", "updated" or "destroyed" + * @param Array<json> resources + * List of all resource's form. A resource is a JSON object piped over to the client. + * It can contain actor IDs, actor forms, to be manually marshalled by the client. + */ + notifyResources(updateType, resources) { + if (resources.length === 0) { + // Don't try to emit if the resources array is empty. + return; + } + + if (this.sessionContext.type == "webextension") { + this._overrideResourceBrowsingContextForWebExtension(resources); + } + + this.emit(`resource-${updateType}-form`, resources); + }, + + /** + * For WebExtension, we have to hack all resource's browsingContextID + * in order to ensure emitting them with the fixed, original browsingContextID + * related to the fallback document created by devtools which always exists. + * The target's form will always be relating to that BrowsingContext IDs (browsing context ID and inner window id). + * Even if the target switches internally to another document via WindowGlobalTargetActor._setWindow. + * + * @param {Array<Objects>} List of resources + */ + _overrideResourceBrowsingContextForWebExtension(resources) { + resources.forEach(resource => { + resource.browsingContextID = this.sessionContext.addonBrowsingContextID; + }); + }, + + /** + * Try to retrieve a parent process TargetActor: + * - either when debugging a parent process page (when browserElement is set to the page's tab), + * - or when debugging the main process (when browserElement is null), including xpcshell tests + * + * See comment in `watchResources`, this will handle targets which are ignored by Frame and Process + * target helpers. (and only those which are ignored) + */ + _getTargetActorInParentProcess() { + // Note: For browser-element debugging, the WindowGlobalTargetActor returned here is created + // for a parent process page and lives in the parent process. + return TargetActorRegistry.getTopLevelTargetActorForContext( + this.sessionContext, + this.conn.prefix + ); + }, + + /** + * Start watching for a list of resource types. + * This should only resolve once all "already existing" resources of these types + * are notified to the client via resource-available-form event on related target actors. + * + * @param {Array<string>} resourceTypes + * List of all types to listen to. + */ + async watchResources(resourceTypes) { + // First process resources which have to be listened from the parent process + // (the watcher actor always runs in the parent process) + await Resources.watchResources( + this, + Resources.getParentProcessResourceTypes(resourceTypes) + ); + + // Bail out early if all resources were watched from parent process. + // In this scenario, we do not need to update these resource types in the WatcherRegistry + // as targets do not care about them. + if (!Resources.hasResourceTypesForTargets(resourceTypes)) { + return; + } + + WatcherRegistry.watchResources(this, resourceTypes); + + // Fetch resources from all existing targets + for (const targetType in TARGET_HELPERS) { + // We process frame targets even if we aren't watching them, + // because frame target helper codepath handles the top level target, if it runs in the *content* process. + // It will do another check to `isWatchingTargets(FRAME)` internally. + // Note that the workaround at the end of this method, using TargetActorRegistry + // is specific to top level target running in the *parent* process. + if ( + !WatcherRegistry.isWatchingTargets(this, targetType) && + targetType != Targets.TYPES.FRAME + ) { + continue; + } + const targetResourceTypes = Resources.getResourceTypesForTargetType( + resourceTypes, + targetType + ); + if (!targetResourceTypes.length) { + continue; + } + const targetHelperModule = TARGET_HELPERS[targetType]; + await targetHelperModule.addSessionDataEntry({ + watcher: this, + type: "resources", + entries: targetResourceTypes, + }); + } + + /* + * The Watcher actor doesn't support watching the top level target + * (bug 1644397 and possibly some other followup). + * + * Because of that, we miss reaching these targets in the previous lines of this function. + * Since all BrowsingContext target actors register themselves to the TargetActorRegistry, + * we use it here in order to reach those missing targets, which are running in the + * parent process (where this WatcherActor lives as well): + * - the parent process target (which inherits from WindowGlobalTargetActor) + * - top level tab target for documents loaded in the parent process (e.g. about:robots). + * When the tab loads document in the content process, the FrameTargetHelper will + * reach it via the JSWindowActor API. Even if it uses MessageManager for anything + * else (RDP packet forwarding, creation and destruction). + * + * We will eventually get rid of this code once all targets are properly supported by + * the Watcher Actor and we have target helpers for all of them. + */ + const targetActor = this._getTargetActorInParentProcess(); + if (targetActor) { + const targetActorResourceTypes = Resources.getResourceTypesForTargetType( + resourceTypes, + targetActor.targetType + ); + await targetActor.addSessionDataEntry( + "resources", + targetActorResourceTypes + ); + } + }, + + /** + * Stop watching for a list of resource types. + * + * @param {Array<string>} resourceTypes + * List of all types to listen to. + */ + unwatchResources(resourceTypes) { + // First process resources which are listened from the parent process + // (the watcher actor always runs in the parent process) + Resources.unwatchResources( + this, + Resources.getParentProcessResourceTypes(resourceTypes) + ); + + // Bail out early if all resources were all watched from parent process. + // In this scenario, we do not need to update these resource types in the WatcherRegistry + // as targets do not care about them. + if (!Resources.hasResourceTypesForTargets(resourceTypes)) { + return; + } + + const isWatchingResources = WatcherRegistry.unwatchResources( + this, + resourceTypes + ); + if (!isWatchingResources) { + return; + } + + // Prevent trying to unwatch when the related BrowsingContext has already + // been destroyed + if (!this.isContextDestroyed()) { + for (const targetType in TARGET_HELPERS) { + // Frame target helper handles the top level target, if it runs in the content process + // so we should always process it. It does a second check to isWatchingTargets. + if ( + !WatcherRegistry.isWatchingTargets(this, targetType) && + targetType != Targets.TYPES.FRAME + ) { + continue; + } + const targetResourceTypes = Resources.getResourceTypesForTargetType( + resourceTypes, + targetType + ); + if (!targetResourceTypes.length) { + continue; + } + const targetHelperModule = TARGET_HELPERS[targetType]; + targetHelperModule.removeSessionDataEntry({ + watcher: this, + type: "resources", + entries: targetResourceTypes, + }); + } + } + + // See comment in watchResources. + const targetActor = this._getTargetActorInParentProcess(); + if (targetActor) { + const targetActorResourceTypes = Resources.getResourceTypesForTargetType( + resourceTypes, + targetActor.targetType + ); + targetActor.removeSessionDataEntry("resources", targetActorResourceTypes); + } + + // Unregister the JS Window Actor if there is no more DevTools code observing any target/resource + WatcherRegistry.maybeUnregisteringJSWindowActor(); + }, + + clearResources(resourceTypes) { + // First process resources which have to be listened from the parent process + // (the watcher actor always runs in the parent process) + // TODO: content process / worker thread resources are not cleared. See Bug 1774573 + Resources.clearResources( + this, + Resources.getParentProcessResourceTypes(resourceTypes) + ); + }, + + /** + * Returns the network actor. + * + * @return {Object} actor + * The network actor. + */ + getNetworkParentActor() { + if (!this._networkParentActor) { + this._networkParentActor = new NetworkParentActor(this); + } + + return this._networkParentActor; + }, + + /** + * Returns the blackboxing actor. + * + * @return {Object} actor + * The blackboxing actor. + */ + getBlackboxingActor() { + if (!this._blackboxingActor) { + this._blackboxingActor = new BlackboxingActor(this); + } + + return this._blackboxingActor; + }, + + /** + * Returns the breakpoint list actor. + * + * @return {Object} actor + * The breakpoint list actor. + */ + getBreakpointListActor() { + if (!this._breakpointListActor) { + this._breakpointListActor = new BreakpointListActor(this); + } + + return this._breakpointListActor; + }, + + /** + * Returns the target configuration actor. + * + * @return {Object} actor + * The configuration actor. + */ + getTargetConfigurationActor() { + if (!this._targetConfigurationListActor) { + this._targetConfigurationListActor = new TargetConfigurationActor(this); + } + return this._targetConfigurationListActor; + }, + + /** + * Returns the thread configuration actor. + * + * @return {Object} actor + * The configuration actor. + */ + getThreadConfigurationActor() { + if (!this._threadConfigurationListActor) { + this._threadConfigurationListActor = new ThreadConfigurationActor(this); + } + return this._threadConfigurationListActor; + }, + + /** + * Server internal API, called by other actors, but not by the client. + * Used to agrement some new entries for a given data type (watchers target, resources, + * breakpoints,...) + * + * @param {String} type + * Data type to contribute to. + * @param {Array<*>} entries + * List of values to add for this data type. + */ + async addDataEntry(type, entries) { + WatcherRegistry.addSessionDataEntry(this, type, entries); + + await Promise.all( + Object.values(Targets.TYPES) + .filter( + targetType => + // We process frame targets even if we aren't watching them, + // because frame target helper codepath handles the top level target, if it runs in the *content* process. + // It will do another check to `isWatchingTargets(FRAME)` internally. + // Note that the workaround at the end of this method, using TargetActorRegistry + // is specific to top level target running in the *parent* process. + WatcherRegistry.isWatchingTargets(this, targetType) || + targetType === Targets.TYPES.FRAME + ) + .map(async targetType => { + const targetHelperModule = TARGET_HELPERS[targetType]; + await targetHelperModule.addSessionDataEntry({ + watcher: this, + type, + entries, + }); + }) + ); + + // See comment in watchResources + const targetActor = this._getTargetActorInParentProcess(); + if (targetActor) { + await targetActor.addSessionDataEntry(type, entries); + } + }, + + /** + * Server internal API, called by other actors, but not by the client. + * Used to remve some existing entries for a given data type (watchers target, resources, + * breakpoints,...) + * + * @param {String} type + * Data type to modify. + * @param {Array<*>} entries + * List of values to remove from this data type. + */ + removeDataEntry(type, entries) { + WatcherRegistry.removeSessionDataEntry(this, type, entries); + + Object.values(Targets.TYPES) + .filter( + targetType => + // See comment in addDataEntry + WatcherRegistry.isWatchingTargets(this, targetType) || + targetType === Targets.TYPES.FRAME + ) + .forEach(targetType => { + const targetHelperModule = TARGET_HELPERS[targetType]; + targetHelperModule.removeSessionDataEntry({ + watcher: this, + type, + entries, + }); + }); + + // See comment in addDataEntry + const targetActor = this._getTargetActorInParentProcess(); + if (targetActor) { + targetActor.removeSessionDataEntry(type, entries); + } + }, + + /** + * Retrieve the current watched data for the provided type. + * + * @param {String} type + * Data type to retrieve. + */ + getSessionDataForType(type) { + return this.sessionData?.[type]; + }, +}); |