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Diffstat (limited to '')
-rw-r--r-- | devtools/server/actors/resources/utils/content-process-storage.js | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/devtools/server/actors/resources/utils/content-process-storage.js b/devtools/server/actors/resources/utils/content-process-storage.js new file mode 100644 index 0000000000..7e126ce3f7 --- /dev/null +++ b/devtools/server/actors/resources/utils/content-process-storage.js @@ -0,0 +1,453 @@ +/* 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 EventEmitter = require("resource://devtools/shared/event-emitter.js"); + +const lazy = {}; +ChromeUtils.defineESModuleGetters(lazy, { + getAddonIdForWindowGlobal: + "resource://devtools/server/actors/watcher/browsing-context-helpers.sys.mjs", +}); + +// ms of delay to throttle updates +const BATCH_DELAY = 200; + +// Filters "stores-update" response to only include events for +// the storage type we desire +function getFilteredStorageEvents(updates, storageType) { + const filteredUpdate = Object.create(null); + + // updateType will be "added", "changed", or "deleted" + for (const updateType in updates) { + if (updates[updateType][storageType]) { + if (!filteredUpdate[updateType]) { + filteredUpdate[updateType] = {}; + } + filteredUpdate[updateType][storageType] = + updates[updateType][storageType]; + } + } + + return Object.keys(filteredUpdate).length ? filteredUpdate : null; +} + +class ContentProcessStorage { + constructor(ActorConstructor, storageKey, storageType) { + this.ActorConstructor = ActorConstructor; + this.storageKey = storageKey; + this.storageType = storageType; + + this.onStoresUpdate = this.onStoresUpdate.bind(this); + this.onStoresCleared = this.onStoresCleared.bind(this); + } + + async watch(targetActor, { onAvailable }) { + const storageActor = new StorageActorMock(targetActor); + this.storageActor = storageActor; + this.actor = new this.ActorConstructor(storageActor); + + // Some storage types require to prelist their stores + await this.actor.populateStoresForHosts(); + + // We have to manage the actor manually, because ResourceCommand doesn't + // use the protocol.js specification. + // resource-available-form is typed as "json" + // So that we have to manually handle stuff that would normally be + // automagically done by procotol.js + // 1) Manage the actor in order to have an actorID on it + targetActor.manage(this.actor); + // 2) Convert to JSON "form" + const form = this.actor.form(); + + // NOTE: this is hoisted, so the `update` method above may use it. + const storage = form; + + // All resources should have a resourceType, resourceId and resourceKey + // attributes, so available/updated/destroyed callbacks work properly. + storage.resourceType = this.storageType; + storage.resourceId = this.storageType; + storage.resourceKey = this.storageKey; + + onAvailable([storage]); + + // Maps global events from `storageActor` shared for all storage-types, + // down to storage-type's specific actor `storage`. + storageActor.on("stores-update", this.onStoresUpdate); + + // When a store gets cleared + storageActor.on("stores-cleared", this.onStoresCleared); + } + + onStoresUpdate(response) { + response = getFilteredStorageEvents(response, this.storageKey); + if (!response) { + return; + } + this.actor.emit("single-store-update", { + changed: response.changed, + added: response.added, + deleted: response.deleted, + }); + } + + onStoresCleared(response) { + const cleared = response[this.storageKey]; + + if (!cleared) { + return; + } + + this.actor.emit("single-store-cleared", { + clearedHostsOrPaths: cleared, + }); + } + + destroy() { + this.actor?.destroy(); + this.actor = null; + if (this.storageActor) { + this.storageActor.on("stores-update", this.onStoresUpdate); + this.storageActor.on("stores-cleared", this.onStoresCleared); + this.storageActor.destroy(); + this.storageActor = null; + } + } +} + +module.exports = ContentProcessStorage; + +// This class mocks what used to be implement in devtools/server/actors/storage.js: StorageActor +// But without being a protocol.js actor, nor implement any RDP method/event. +// An instance of this class is passed to each storage type actor and named `storageActor`. +// Once we implement all storage type in watcher classes, we can get rid of the original +// StorageActor in devtools/server/actors/storage.js +class StorageActorMock extends EventEmitter { + constructor(targetActor) { + super(); + // Storage classes fetch conn from storageActor + this.conn = targetActor.conn; + this.targetActor = targetActor; + + this.childWindowPool = new Set(); + + // Fetch all the inner iframe windows in this tab. + this.fetchChildWindows(this.targetActor.docShell); + + // Notifications that help us keep track of newly added windows and windows + // that got removed + Services.obs.addObserver(this, "content-document-global-created"); + Services.obs.addObserver(this, "inner-window-destroyed"); + this.onPageChange = this.onPageChange.bind(this); + + const handler = targetActor.chromeEventHandler; + handler.addEventListener("pageshow", this.onPageChange, true); + handler.addEventListener("pagehide", this.onPageChange, true); + + this.destroyed = false; + this.boundUpdate = {}; + } + + destroy() { + clearTimeout(this.batchTimer); + this.batchTimer = null; + // Remove observers + Services.obs.removeObserver(this, "content-document-global-created"); + Services.obs.removeObserver(this, "inner-window-destroyed"); + this.destroyed = true; + if (this.targetActor.browser) { + this.targetActor.browser.removeEventListener( + "pageshow", + this.onPageChange, + true + ); + this.targetActor.browser.removeEventListener( + "pagehide", + this.onPageChange, + true + ); + } + this.childWindowPool.clear(); + + this.childWindowPool = null; + this.targetActor = null; + this.boundUpdate = null; + } + + get window() { + return this.targetActor.window; + } + + get document() { + return this.targetActor.window.document; + } + + get windows() { + return this.childWindowPool; + } + + /** + * Given a docshell, recursively find out all the child windows from it. + * + * @param {nsIDocShell} item + * The docshell from which all inner windows need to be extracted. + */ + fetchChildWindows(item) { + const docShell = item + .QueryInterface(Ci.nsIDocShell) + .QueryInterface(Ci.nsIDocShellTreeItem); + if (!docShell.docViewer) { + return null; + } + const window = docShell.docViewer.DOMDocument.defaultView; + if (window.location.href == "about:blank") { + // Skip out about:blank windows as Gecko creates them multiple times while + // creating any global. + return null; + } + if (!this.isIncludedInTopLevelWindow(window)) { + return null; + } + this.childWindowPool.add(window); + for (let i = 0; i < docShell.childCount; i++) { + const child = docShell.getChildAt(i); + this.fetchChildWindows(child); + } + return null; + } + + isIncludedInTargetExtension(subject) { + const addonId = lazy.getAddonIdForWindowGlobal(subject.windowGlobalChild); + return addonId && addonId === this.targetActor.addonId; + } + + isIncludedInTopLevelWindow(window) { + return this.targetActor.windows.includes(window); + } + + getWindowFromInnerWindowID(innerID) { + innerID = innerID.QueryInterface(Ci.nsISupportsPRUint64).data; + for (const win of this.childWindowPool.values()) { + const id = win.windowGlobalChild.innerWindowId; + if (id == innerID) { + return win; + } + } + return null; + } + + getWindowFromHost(host) { + for (const win of this.childWindowPool.values()) { + const origin = win.document.nodePrincipal.originNoSuffix; + const url = win.document.URL; + if (origin === host || url === host) { + return win; + } + } + return null; + } + + /** + * Event handler for any docshell update. This lets us figure out whenever + * any new window is added, or an existing window is removed. + */ + observe(subject, topic) { + if ( + subject.location && + (!subject.location.href || subject.location.href == "about:blank") + ) { + return null; + } + + // We don't want to try to find a top level window for an extension page, as + // in many cases (e.g. background page), it is not loaded in a tab, and + // 'isIncludedInTopLevelWindow' throws an error + if ( + topic == "content-document-global-created" && + (this.isIncludedInTargetExtension(subject) || + this.isIncludedInTopLevelWindow(subject)) + ) { + this.childWindowPool.add(subject); + this.emit("window-ready", subject); + } else if (topic == "inner-window-destroyed") { + const window = this.getWindowFromInnerWindowID(subject); + if (window) { + this.childWindowPool.delete(window); + this.emit("window-destroyed", window); + } + } + return null; + } + + /** + * Called on "pageshow" or "pagehide" event on the chromeEventHandler of + * current tab. + * + * @param {event} The event object passed to the handler. We are using these + * three properties from the event: + * - target {document} The document corresponding to the event. + * - type {string} Name of the event - "pageshow" or "pagehide". + * - persisted {boolean} true if there was no + * "content-document-global-created" notification along + * this event. + */ + onPageChange({ target, type, persisted }) { + if (this.destroyed) { + return; + } + + const window = target.defaultView; + + if (type == "pagehide" && this.childWindowPool.delete(window)) { + this.emit("window-destroyed", window); + } else if ( + type == "pageshow" && + persisted && + window.location.href && + window.location.href != "about:blank" && + this.isIncludedInTopLevelWindow(window) + ) { + this.childWindowPool.add(window); + this.emit("window-ready", window); + } + } + + /** + * This method is called by the registered storage types so as to tell the + * Storage Actor that there are some changes in the stores. Storage Actor then + * notifies the client front about these changes at regular (BATCH_DELAY) + * interval. + * + * @param {string} action + * The type of change. One of "added", "changed" or "deleted" + * @param {string} storeType + * The storage actor in which this change has occurred. + * @param {object} data + * The update object. This object is of the following format: + * - { + * <host1>: [<store_names1>, <store_name2>...], + * <host2>: [<store_names34>...], + * } + * Where host1, host2 are the host in which this change happened and + * [<store_namesX] is an array of the names of the changed store objects. + * Pass an empty array if the host itself was affected: either completely + * removed or cleared. + */ + // eslint-disable-next-line complexity + update(action, storeType, data) { + if (action == "cleared") { + this.emit("stores-cleared", { [storeType]: data }); + return null; + } + + if (this.batchTimer) { + clearTimeout(this.batchTimer); + } + if (!this.boundUpdate[action]) { + this.boundUpdate[action] = {}; + } + if (!this.boundUpdate[action][storeType]) { + this.boundUpdate[action][storeType] = {}; + } + for (const host in data) { + if (!this.boundUpdate[action][storeType][host]) { + this.boundUpdate[action][storeType][host] = []; + } + for (const name of data[host]) { + if (!this.boundUpdate[action][storeType][host].includes(name)) { + this.boundUpdate[action][storeType][host].push(name); + } + } + } + if (action == "added") { + // If the same store name was previously deleted or changed, but now is + // added somehow, dont send the deleted or changed update. + this.removeNamesFromUpdateList("deleted", storeType, data); + this.removeNamesFromUpdateList("changed", storeType, data); + } else if ( + action == "changed" && + this.boundUpdate.added && + this.boundUpdate.added[storeType] + ) { + // If something got added and changed at the same time, then remove those + // items from changed instead. + this.removeNamesFromUpdateList( + "changed", + storeType, + this.boundUpdate.added[storeType] + ); + } else if (action == "deleted") { + // If any item got delete, or a host got delete, no point in sending + // added or changed update + this.removeNamesFromUpdateList("added", storeType, data); + this.removeNamesFromUpdateList("changed", storeType, data); + + for (const host in data) { + if ( + !data[host].length && + this.boundUpdate.added && + this.boundUpdate.added[storeType] && + this.boundUpdate.added[storeType][host] + ) { + delete this.boundUpdate.added[storeType][host]; + } + if ( + !data[host].length && + this.boundUpdate.changed && + this.boundUpdate.changed[storeType] && + this.boundUpdate.changed[storeType][host] + ) { + delete this.boundUpdate.changed[storeType][host]; + } + } + } + + this.batchTimer = setTimeout(() => { + clearTimeout(this.batchTimer); + this.emit("stores-update", this.boundUpdate); + this.boundUpdate = {}; + }, BATCH_DELAY); + + return null; + } + + /** + * This method removes data from the this.boundUpdate object in the same + * manner like this.update() adds data to it. + * + * @param {string} action + * The type of change. One of "added", "changed" or "deleted" + * @param {string} storeType + * The storage actor for which you want to remove the updates data. + * @param {object} data + * The update object. This object is of the following format: + * - { + * <host1>: [<store_names1>, <store_name2>...], + * <host2>: [<store_names34>...], + * } + * Where host1, host2 are the hosts which you want to remove and + * [<store_namesX] is an array of the names of the store objects. + */ + removeNamesFromUpdateList(action, storeType, data) { + for (const host in data) { + if ( + this.boundUpdate[action] && + this.boundUpdate[action][storeType] && + this.boundUpdate[action][storeType][host] + ) { + for (const name in data[host]) { + const index = this.boundUpdate[action][storeType][host].indexOf(name); + if (index > -1) { + this.boundUpdate[action][storeType][host].splice(index, 1); + } + } + if (!this.boundUpdate[action][storeType][host].length) { + delete this.boundUpdate[action][storeType][host]; + } + } + } + return null; + } +} |