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diff --git a/devtools/docs/contributor/tools/console-panel.md b/devtools/docs/contributor/tools/console-panel.md new file mode 100644 index 0000000000..68fa24e349 --- /dev/null +++ b/devtools/docs/contributor/tools/console-panel.md @@ -0,0 +1,158 @@ +# Console Tool Architecture + +The Console panel is responsible for rendering all logs coming from the current page. + +## Architecture + +Internal architecture of the Console panel (the client side) is described +on the following diagram. + +<figure class="hero"> + <pre class="diagram"> +┌──────────────────────────────┐ ┌────────────────────────┐ +│ DevTools │ │ WebConsolePanel │ +│[client/framework/devtools.js]│ │ [panel.js] │ +└──────────────────────────────┘ └────────────────────────┘ + │ │ + │ + openBrowserConsole() or │ + toggleBrowserConsole() │ + │ │ + ▼ │ +┌──────────────────────────────┐ {hud} +│ BrowserConsoleManager │ │ +│ [browser-console-manager.js] │ │ +└──────────────────────────────┘ │ + │ │ + │ │ + {_browserConsole} │ + │ │ + ▼ 0..1 ▼ 1 +┌──────────────────────────────┐ ┌────────────────────────┐ +│ BrowserConsole │ │ WebConsole │ +│ [browser-console.js] │─ ─ extends ─ ▶│ [webconsole.js] │ +└──────────────────────────────┘ └──────────────1─────────┘ + │ + {ui} + │ + ▼ 1 + ┌────────────────────────┐ + │ WebConsoleUI │ + │ [webconsole-ui.js] │ + └────────────────────────┘ + │ + {wrapper} + │ + │ + ▼ 1 + ┌────────────────────────┐ + │ WebConsoleWrapper │ + │[webconsole-wrapper.js] │ + └────────────────────────┘ + │ + <renders> + │ + ▼ + ┌────────────────────────┐ + │ App │ + └────────────────────────┘ + </pre> + <figcaption>Elements between curly bracket on arrows represent the property name of the reference (for example, the WebConsolePanel as a `hud` property that is a reference to the WebConsole instance)</figcaption> +</figure> + +## Components + +The Console panel UI is built on top of [React](../frontend/react.md). It defines set of React components in `components` directory +The React architecture is described on the following diagram. + +<figure class="hero"> + <pre class="diagram"> +┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ + WebConsole React components │ +│ [/components] ┌────────────────────────┐ + │ App │ │ +│ └────────────────────────┘ + │ │ +│ │ + ┌───────────────────┬──────────────────────┬───────────────────┬───────────┴─────────┬───────────────────────┬────────────────────┬─────────────────┐ │ +│ │ │ │ │ │ │ │ │ + ▼ ▼ ▼ ▼ ▼ ▼ ▼ ▼ │ ┌────────────────────────────────────────┐ +│ ┌──────────┐ ┌────────────────┐ ┌────────────────┐ ┌───────────┐ ┌────────────────────┐ ┌──────────────┐ ┌──────────────┐ ┌─────────┐ │ Editor │ + │ SideBar │ │NotificationBox │ │ ConfirmDialog │ │ FilterBar │ │ ReverseSearchInput │ │ConsoleOutput │ │EditorToolbar │ │ JSTerm │──.editor───▶│ <CodeMirror> │ +│ └──────────┘ └────────────────┘ │ <portal> │ └───────────┘ └────────────────────┘ └──────────────┘ └──────────────┘ └─────────┘ │ [client/shared/sourceeditor/editor.js] │ + │ └────────────────┘ │ │ │ └────────────────────────────────────────┘ +│ │ ┌─────────┴─────────────┐ │ + │ │ │ │ │ +│ │ ▼ ▼ ▼ + │ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ │ +│ │ │ FilterButton │ │ FilterCheckbox │ │ MessageContainer │ + │ └──────────────────┘ └──────────────────┘ └──────────────────┘ │ +│ │ │ + │ │ │ +│ │ │ + │ ▼ │ +│ │ ┌──────────────────┐ + │ │ Message │ │ +│ │ └──────────────────┘ + │ │ │ ┌─────────────────────────────────────┐ +│ │ │ │ Frame │ + │ ┌─────────────────────┬─────────────────────┬─────────────────────┬───────┴─────────────┬─────────────────────┬─────────────┼─────┬──▶│ [client/shared/components/Frame.js] │ +│ │ │ │ │ │ │ │ │ └─────────────────────────────────────┘ + │ ▼ ▼ ▼ ▼ ▼ ▼ │ │ +│ │ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ │ ┌────────────────────────────────────────┐ + │ │ MessageIndent │ │ MessageIcon │ │ CollapseButton │ │ GripMessageBody │ │ ConsoleTable │ │ MessageRepeat │ │ │ │ SmartTrace │ +│ │ └──────────────────┘ └──────────────────┘ └──────────────────┘ └──────────────────┘ └──────────────────┘ └──────────────────┘ ├──▶│[client/shared/components/SmartTrace.js]│ + │ │ │ │ │ └────────────────────────────────────────┘ +└ ─ ─ ─ ┼ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─│─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─│─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ │ + │ │ │ │ ┌──────────────────────────────────────────────────┐ + │ │ │ │ │ TabboxPanel │ + │ ├─────────────────────┘ └──▶│[client/netmonitor/src/components/TabboxPanel.js] │ + │ │ └──────────────────────────────────────────────────┘ + │ │ + │ │ + │ ▼ + │ ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ + │ Reps ┌──────────────────────┐ │ + │ │ [client/shared/components/reps/reps.js] │ ObjectInspector │ + │ └──────────────────────┘ │ + │ │ │ + │ ▼ │ + │ │ ┌──────────────────────┐ + │ │ ObjectInspectorItem │ │ + │ │ └──────────────────────┘ + └───────────────────────────────────────────────────────────────▶ │ │ + │ ▼ + ┌──────────────────────┐ │ + │ ┌─▶│ Rep │ + │ └──────────────────────┘ │ + │ │ │ + │ │ │ + │ └──────────────┘ + ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘ + </pre> +</figure> + +There are several external components we use from the WebConsole: +- ObjectInspector/Rep: Used to display a variable in the console output and handle expanding the variable when it's not a primitive. +- Frame: Used to display the location of messages. +- SmartTrace: Used to display the stack trace of messages and errors +- TabboxPanel: Used to render a network message detail. This is directly using the component from the Netmonitor so we are consistent in how we display a request internals. + +## Actions + +The Console panel implements a set of actions divided into several groups. + +- **Filters** Actions related to content filtering. +- **Messages** Actions related to list of messages rendered in the panel. +- **UI** Actions related to the UI state. + +### State + +The Console panel manages the app state via [Redux](../frontend/redux.md). + +There are following reducers defining the panel state: + +- `reducers/filters.js` state for panel filters. These filters can be set from within the panel's toolbar (e.g. error, info, log, css, etc.) +- `reducers/messages.js` state of all messages rendered within the panel. +- `reducers/prefs.js` Preferences associated with the Console panel (e.g. logLimit) +- `reducers/ui.js` UI related state (sometimes also called a presentation state). This state contains state of the filter bar (visible/hidden), state of the time-stamp (visible/hidden), etc. diff --git a/devtools/docs/contributor/tools/debugger-panel.md b/devtools/docs/contributor/tools/debugger-panel.md new file mode 100644 index 0000000000..0e1faa380c --- /dev/null +++ b/devtools/docs/contributor/tools/debugger-panel.md @@ -0,0 +1,3 @@ +# Debugger Tool Architecture + +Documentation for the Debugger tool in currently under construction. diff --git a/devtools/docs/contributor/tools/highlighters.md b/devtools/docs/contributor/tools/highlighters.md new file mode 100644 index 0000000000..3f377e3843 --- /dev/null +++ b/devtools/docs/contributor/tools/highlighters.md @@ -0,0 +1,184 @@ +# Highlighters + +This article provides technical documentation about DevTools highlighters. + +By highlighter, we mean anything that DevTools displays on top of the content page, in order to highlight an element, a set of elements or shapes to users. + +The most obvious form of highlighter is the box-model highlighter, whose job is to display the 4 box-model regions on top of a given element in the content page, as illustrated in the following screen capture: + + + +But there can be a wide variety of highlighters. In particular, highlighters are a pretty good way to give detailed information about: + +* the exact form of a css shape, +* how a css transform applied to an element, +* which are all the elements that match a given selector, +* ... + +## Using highlighters + +Highlighters run on the debuggee side, not on the toolbox side. This is so that it's possible to highlight elements on a remote device for instance. This means you need to go through the [Remote Debugging Protocol](../backend/protocol.md) to use a highlighter. + +The InspectorFront provides the following method: + +| Method | Description | +|----------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| `getHighlighterByType(typeName)` | Instantiate a new highlighter, given its type (as a String). At the time of writing, the available types of highlighters are: `CssGridHighlighter`, `BoxModelHighlighter`, `CssTransformHighlighter`, `FlexboxHighlighter`, `FontsHighlighter`, `GeometryEditorHighlighter`, `MeasuringToolHighlighter`, `PausedDebuggerOverlay`, `RulersHighlighter`, `SelectorHighlighter` and `ShapesHighlighter`. This returns a promise that resolves to the new instance of [protocol.js](https://wiki.mozilla.org/DevTools/protocol.js) actor. | + +### The highlighter API + +When getting a highlighter via `InspectorFront.getHighlighterByType(typeName)`, the right type of highlighter will be instantiated on the server-side and will be wrapped into a `CustomHighlighterActor` and that's what will be returned to the caller. This means that all types of highlighters share the same following API: + +| Method | Description | +|------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| +| `show(NodeActor node[, Object options])` | Highlighters are hidden by default. Calling this method is what makes them visible. The first, mandatory, parameter should be a NodeActor. NodeActors are what the WalkerActor return. It's easy to get a NodeActor for an existing DOM node. For example `toolbox.walker.querySelector(toolbox.walker.rootNode, "css selector")` resolves to a NodeFront (the client-side version of the NodeActor) which can be used as the first parameter. The second, optional, parameter depends on the type of highlighter being used. | +| `hide()` | Hides the highlighter. | +| `finalize()` | Destroys the highlighter. | + +## Creating new highlighters + +Before digging into how one goes about adding a new type of highlighter to the DevTools, it is worth understanding how are highlighters displayed in the page. + +### Inserting content in the page + +Highlighters use web technology themselves to display the required information on screen. For instance, the box-model highlighter uses SVG to draw the margin, border, padding and content regions over the highlighted node. + +This means the highlighter content needs to be inserted in the page, but in a non-intrusive way. Indeed, the DevTools should never alter the page unless the alteration was done by the user (like changing the DOM using the inspector or a CSS rule via the style-editor for example). So simply appending the highlighter's markup in the content document is not an option. + +Furthermore, highlighters not only need to work with Firefox Desktop, but they should work just as well on Firefox OS, Firefox for Android, and more generally anything that runs the Gecko rendering engine. Therefore appending the highlighter's markup to the browser chrome XUL structure isn't an option either. + +To this end, DevTools highlighters make use of a (chrome-only) API: + +``` + /** + * Chrome document anonymous content management. + * This is a Chrome-only API that allows inserting fixed positioned anonymous + * content on top of the current page displayed in the document. + * The supplied content is cloned and inserted into the document's CanvasFrame. + * Note that this only works for HTML documents. + */ + partial interface Document { + /** + * Deep-clones the provided element and inserts it into the CanvasFrame. + * Returns an AnonymousContent instance that can be used to manipulate the + * inserted element. + */ + [ChromeOnly, NewObject, Throws] + AnonymousContent insertAnonymousContent(Element aElement); + + /** + * Removes the element inserted into the CanvasFrame given an AnonymousContent + * instance. + */ + [ChromeOnly, Throws] + void removeAnonymousContent(AnonymousContent aContent); + }; +``` + +Using this API, it is possible for chrome-privileged JS to insert arbitrary DOM elements on top of the content page. + +Technically, the DOM element is inserted into the `CanvasFrame` of the document. The `CanvasFrame` is part of the rendered frame tree and the DOM element is part of the native anonymous elements of the `CanvasFrame`. + +Consider the following simple example: + +```js + let el = document.createElement("div"); + el.textContent = "My test element"; + let insertedEl = document.insertAnonymousContent(el); +``` + +In this example, the test DIV will be inserted in the page, and will be displayed on top of everything else, in a way that doesn't impact the current layout. + +### The AnonymousContent API + +In the previous example, the returned `insertedEl` object isn't a DOM node, and it certainly is not `el`. It is a new object, whose type is `AnonymousContent` ([see the WebIDL here](https://searchfox.org/mozilla-central/source/dom/webidl/AnonymousContent.webidl)). + +Because of the way content is inserted into the page, it isn't wanted to give consumers a direct reference to the inserted DOM node. This is why `document.insertAnonymousContent(el)` actually **clones** `el` and returns a new object whose API lets consumers make changes to the inserted element in a way that never gives back a reference to the inserted DOM node. + +### CanvasFrameAnonymousContentHelper + +In order to help with the API described in the previous section, the `CanvasFrameAnonymousContentHelper` class was introduced. + +Its goal is to provide a simple way for highlighters to insert their content into the page and modify it dynamically later. One of its goal is also to re-insert the highlighters' content on page navigation. Indeed, the frame tree is destroyed when the page is navigated away from since it represents the document element. One thing to note is that highlighter content insertion is asynchronous and `CanvasFrameAnonymousContentHelper` users must call and wait for its `initialize` method to resolve. + +Using this helper is quite simple: + +```js +let helper = new CanvasFrameAnonymousContentHelper(targetActor, this.buildMarkup.bind(this)); +await helper.initialize(); +``` + +It only requires a `targetActor`, which highlighters get when they are instantiated, and a callback function that will be used to create and insert the content the first time the highlighter is shown, and every time there's a page navigation. + +The returned object provides the following API: + +| Method | Description | +|-------------------------------------------|------------------------------------------------------------| +| `getTextContentForElement(id)` | Get the textContent of an element given its ID. | +| `setTextContentForElement(id, text)` | Set the textContent of an element given its ID. | +| `setAttributeForElement(id, name, value)` | Set an attribute value of an element given its ID. | +| `getAttributeForElement(id, name)` | Get an attribute value of an element given its ID. | +| `removeAttributeForElement(id, name)` | Remove an attribute of an element given its ID. | +| `content` | This property returns the wrapped AnonymousContent object. | +| `destroy()` | Destroy the helper instance. | + + ### Creating a new highlighter class + +A good way to get started is by taking a look at [existing highlighters here](https://searchfox.org/mozilla-central/rev/1a973762afcbc5066f73f1508b0c846872fe3952/devtools/server/actors/highlighters.js#519-530). + +Here is some boilerplate code for a new highlighter class: + +```js + function MyNewHighlighter(targetActor) { + this.doc = targetActor.window.document; + this.markup = new CanvasFrameAnonymousContentHelper(targetActor, this._buildMarkup.bind(this)); + this.markup.initialize(); + } + + MyNewHighlighter.prototype = { + destroy: function() { + this.doc = null; + this.markup.destroy(); + }, + + _buildMarkup: function() { + let container = this.markup.anonymousContentDocument.createElement("div"); + container.innerHTML = '<div id="new-highlighted-" style="display:none;">'; + return container; + }, + + show: function(node, options) { + this.markup.removeAttributeForElement("new-highlighted-el", "style"); + }, + + hide: function() { + this.markup.setAttributeForElement("new-highlighted-el", "style", "display:none;"); + } + }; +``` + +In most situations, the `container` returned by `_buildMarkup` will be absolutely positioned, and will need to contain elements with IDs, so that these can then later be moved, resized, hidden or shown in `show` and `hide` using the AnonymousContent API. + +### The AutoRefreshHighlighter parent class + +It is worth mentioning this class as it may be a useful parent class to inherit a new highlighter from in some situations. + +If the new highlighter's job is to highlight an element in the DOM, then it most likely should inherit from `AutoRefreshHighlighter`. + +The `AutoRefreshHighlighter` class updates itself in a loop, checking if the currently highlighted node's geometry has changed since the last iteration. This is useful to make sure the highlighter **follows** the highlighted node around, in case the layout around it changes, or in case it is an animated node. + +Sub classes must implement the following methods: + +| Method | Description | +|-------------|-------------------------------------------------------------------------------------| +| `_show()` | Called when the highlighter should be shown. | +| `_update()` | Called while the highlighter is shown and the geometry of the current node changes. | +| `_hide()` | Called when the highlighter should be hidden. | + +Sub classes will have access to the following properties: + +| Property | Description | +|---------------------|-------------------------------------------| +| `this.currentNode` | The node to be shown. | +| `this.currentQuads` | All of the node's box model region quads. | +| `this.win` | The current window | diff --git a/devtools/docs/contributor/tools/inspector-panel.md b/devtools/docs/contributor/tools/inspector-panel.md new file mode 100644 index 0000000000..ee8abca83b --- /dev/null +++ b/devtools/docs/contributor/tools/inspector-panel.md @@ -0,0 +1,93 @@ +# High-Level Inspector Architecture + +## UI structure +The Inspector panel is a tab in the toolbox. Like all tabs, it's in its own iframe. + +The high-level hierarchy looks something like this: + + Toolbox + | + InspectorPanel + | + +-------------+------------------+---------------+ + | | | | + MarkupView SelectorSearch HTMLBreadcrumbs ToolSidebar widget (iframes) + | + +- RuleView + | + +- ComputedView + | + +- LayoutView + | + +- FontInspector + | + +- AnimationInspector + +## Server dependencies +- The inspector panel relies on a series of actors that live on the server. +- Some of the most important actors are actually instantiated by the toolbox, because these actors are needed for other panels to preview and link to DOM nodes. For example, the webconsole needs to output DOM nodes, highlight them in the page on mouseover, and open them in the inspector on click. This is achieved using some of the same actors that the inspector panel uses. +- See Toolbox.prototype.initInspector: This method instantiates the InspectorActor, WalkerActor and HighlighterActor lazily, whenever they're needed by a panel. + +## Panel loading overview +- As with other panels, this starts with Toolbox.prototype.loadTool(id) +- For the inspector though, this calls Toolbox.prototype.initInspector +- When the panel's open method is called: + - It uses the WalkerActor for the first time to know the default selected node (which could be a node that was selected before on the same page). + - It starts listening to the WalkerActor's "new-root" events to know when to display a new DOM tree (when there's a page navigation). + - It creates the breadcrumbs widget, the sidebar widget, the search widget, the markup-view +- Sidebar: + - When this widget initializes, it loads its sub-iframes (rule-view, ...) + - Each of these iframes contain panel that, in turn, listen to inspector events like "new-node-front" to know when to retrieve information about a node (i.e the rule-view will fetch the css rules for a node). +- Markup-view: + - This panel initializes in its iframe, and gets a reference to the WalkerActor. It uses it to know the DOM tree to display. It knows when nodes change (markup-mutations), and knows what root node to start from. + - It only displays the nodes that are supposed to be visible at first (usually html, head, body and direct children of body). + - Then, as you expand nodes, it uses the WalkerActor to get more nodes lazily. It only ever knows data about nodes that have already been expanded once in the UI. + +## Server-side structure +Simplified actor hierarchy + + InspectorActor + | + +---------------+ + | | + WalkerActor PageStyleActor (for rule-view/computed-view) + | | + NodeActor StyleRuleActor + +__InspectorActor__ + +This tab-level actor is the one the inspector-panel connects to. It doesn't do much apart from creating and returning the WalkerActor and PageStyleActor. + +__WalkerActor__ + +- Single most important part of the inspector panel. +- Responsible for walking the DOM on the current page but: + - also walks iframes + - also finds pseudo-elements ::before and ::after + - also finds anonymous content (e.g. in the BrowserToolbox) +- The actor uses an instance of inIDeepTreeWalker to walk the DOM +- Provides a tree of NodeActor objects that reflects the DOM. +- But only has a partial knowledge of the DOM (what is currently displayed/expanded in the MarkupView). It doesn't need to walk the whole tree when you first instantiate it. +- Reflects some of the usual DOM APIs like querySelector. +- Note that methods like querySelector return arbitrarily nested NodeActors, in which case the WalkerActor also sends the list of parents to link the returned nodes to the closest known nodes, so the UI can display the tree correctly. +- Emits events when there are DOM mutations. These events are sent to the front-end and used to, for example refresh the markup-view. This uses an instance of MutationObserver (https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver) configured with, in particular, nativeAnonymousChildList set to true, so that mutation events are also sent when pseudo elements are added/removed via css. + +__NodeActor__ + +- Representation of a single DOM node (tagname, namespace, attributes, parent, sibblings, ...), which panels use to display previews of nodes. +- Also provide useful methods to: + - change attributes + - scroll into view + - get event listeners data + - get image data + - get unique css selector + +## Highlighters + +One of the important aspects of the inspector is the highlighters. +You can find a lot more [documentation about highlighters here](highlighters.md). + +We don't just have 1 highlighter, we have a framework for highlighters: +- a (chrome-only) platform API to inject markup in a native-anonymous node in content (that works on all targets) +- a number of specific highlighter implementations (css transform, rect, selector, geometry, rulers, ...) +- a CustomHighlighterActor to get instances of specific highlighters diff --git a/devtools/docs/contributor/tools/inspector.md b/devtools/docs/contributor/tools/inspector.md new file mode 100644 index 0000000000..6a3a223da5 --- /dev/null +++ b/devtools/docs/contributor/tools/inspector.md @@ -0,0 +1,2 @@ + +These files provide information about the Inspector panel architecture. diff --git a/devtools/docs/contributor/tools/memory-panel.md b/devtools/docs/contributor/tools/memory-panel.md new file mode 100644 index 0000000000..d04ffecfc2 --- /dev/null +++ b/devtools/docs/contributor/tools/memory-panel.md @@ -0,0 +1,230 @@ +# Memory Tool Architecture + +The memory tool is built of three main elements: + +1. The live heap graph exists in memory, and is managed by the C++ allocator and + garbage collector. In order to get access to the structure of this graph, a + specialized interface is created to represent its state. The `JS::ubi::Node` + is the basis for this representation. This interface can be created from the + live heap graph, or a serialized, offline snapshot from a previous moment in + time. Our various heap analyses (census, dominator trees, shortest paths, + etc) run on top of `JS::ubi::Node` graphs. The `ubi` in the name stands for + "ubiquitous" and provides a namespace for memory analyses in C++ code. + +2. The `HeapAnalysesWorker` runs in a worker thread, performing analyses on + snapshots and translating the results into something the frontend can render + simply and quickly. The `HeapAnalysesClient` is used to communicate between + the worker and the main thread. + +3. Finally, the last element is the frontend that renders data received from the + `HeapAnalysesClient` to the DOM and translates user input into requests for + new data with the `HeapAnalysesClient`. + +Unlike other tools (such as the JavaScript debugger), the memory tool makes very +little use of the Remote DevTools Server and the actors that reside in it. Use +of the +[`MemoryActor`](https://searchfox.org/mozilla-central/source/devtools/server/actors/memory.js) +is limited to toggling allocation stack recording on and off, and transferring +heap snapshots from the debuggee (which is on the server) to the +`HeapAnalysesWorker` (which is on the client). A nice benefit that naturally +emerges, is that supporting "legacy" servers (eg, using Firefox Developer +Edition as a client to remote debug a release Firefox for Android server) is a +no-op. As we add new analyses, we can run them on snapshots taken on old servers +no problem. The only requirement is that changes to the snapshot format itself +remain backwards compatible. + +## `JS::ubi::Node` + +`JS::ubi::Node` is a lightweight serializable interface that can represent the +current state of the heap graph. For a deeper dive into the particulars of how +it works, it is very well documented in the `js/public/UbiNode.h` + +A "heap snapshot" is a representation of the heap graph at some particular past +instance in time. + +A "heap analysis" is an algorithm that runs on a `JS::ubi::Node` heap graph. +Generally, analyses can run on either the live heap graph or a deserialized +snapshot. Example analyses include "census", which aggregates and counts nodes +into various user-specified buckets; "dominator trees", which compute the +[dominates](https://en.wikipedia.org/wiki/Dominator_%28graph_theory%29) relation +and retained size for all nodes in the heap graph; and "shortest paths" which +finds the shortest paths from the GC roots to some subset of nodes. + +### Saving Heap Snapshots + +Saving a heap snapshot has a few requirements: + +1. The binary format must remain backwards compatible and future extensible. + +2. The live heap graph must not mutate while we are in the process of + serializing it. + +3. The act of saving a heap snapshot should impose as little memory overhead as + possible. If we are taking a snapshot to debug frequent out-of-memory errors, + we don't want to trigger an OOM ourselves! + +To solve (1), we use the [protobuf](https://developers.google.com/protocol-buffers/) +message format. The message definitions themselves are in +`devtools/shared/heapsnapshot/CoreDump.proto`. We always use `optional` fields +so we can change our mind about what fields are required sometime in the future. +Deserialization checks the semantic integrity of deserialized protobuf messages. + +For (2), we rely on SpiderMonkey's GC rooting hazard static analysis and the +`AutoCheckCannotGC` dynamic analysis to ensure that neither JS nor GC runs and +modifies objects or moves them from one address in memory to another. There is +no equivalent suppression and static analysis technique for the +[cycle collector](https://developer.mozilla.org/en/docs/Interfacing_with_the_XPCOM_cycle_collector), +so care must be taken not to invoke methods that could start cycle collection or +mutate the heap graph from the cycle collector's perspective. At the time of +writing, we don't yet support saving the cycle collector's portion of the heap +graph in snapshots, but that work is deemed Very Important and Very High +Priority. + +Finally, (3) imposes upon us that we do not build the serialized heap snapshot +binary blob in memory, but instead stream it out to disk while generating it. + +Once all of that is accounted for, saving snapshots becomes pretty straight +forward. We traverse the live heap graph with `JS::ubi::Node` and +`JS::ubi::BreadthFirst`, create a protobuf message for each node and each node's +edges, and write these messages to disk before continuing the traversal to the +next node. + +This functionality is exposed to chrome JavaScript as the +`ChromeUtils.saveHeapSnapshot` function. See `dom/webidl/ChromeUtils.webidl` for +API documentation. + +### Reading Heap Snapshots + +Reading heap snapshots has less restrictions than saving heap snapshots. The +protobuf messages that make up the core dump are deserialized one by one, stored +as a set of `DeserializedNode`s and a set of `DeserializedEdge`s, and the result +is a `HeapSnapshot` instance. + +The `DeserializedNode` and `DeserializedEdge` classes implement the +`JS::ubi::Node` interface. Analyses running on offline heap snapshots rather +than the live heap graph operate on these classes (unknowingly, of course). + +For more details, see the +[`mozilla::devtools::HeapSnapshot`](https://searchfox.org/mozilla-central/source/devtools/shared/heapsnapshot/HeapSnapshot.cpp) +and +[`mozilla::devtools::Deserialized{Node,Edge}`](https://searchfox.org/mozilla-central/source/devtools/shared/heapsnapshot/DeserializedNode.h) +classes. + +### Heap Analyses + +Heap analyses operate on `JS::ubi::Node` graphs without knowledge of whether +that graph is backed by the live heap graph or an offline heap snapshot. They +must make sure never to allocate GC things or modify the live heap graph. + +In general, analyses are implemented in their own +`js/public/Ubi{AnalysisName}.h` header (eg `js/public/UbiCensus.h`), and are +exposed to chrome JavaScript code via a method on the +[`HeapSnapshot`](https://searchfox.org/mozilla-central/source/dom/webidl/HeapSnapshot.webidl) +webidl interface. + +For each analysis we expose to chrome JavaScript on the `HeapSnapshot` webidl +interface, there is a small amount of glue code in Gecko. The +[`mozilla::devtools::HeapSnapshot`](https://searchfox.org/mozilla-central/source/devtools/shared/heapsnapshot/HeapSnapshot.h) +C++ class implements the webidl interface. The analyses methods (eg +`ComputeDominatorTree`) take the deserialized nodes and edges from the heap +snapshot, create `JS::ubi::Node`s from them, call the analyses from +`js/public/Ubi*.h`, and wrap the results in something that can be represented in +JavaScript. + +For API documentation on running specific analyses, see the +[`HeapSnapshot`](https://searchfox.org/mozilla-central/source/dom/webidl/HeapSnapshot.webidl) +webidl interface. + +### Testing `JS::ubi::Node`, Snapshots, and Analyses + +The majority of the tests reside within `devtools/shared/heapsnapshot/tests/**`. +For reading and saving heap snapshots, most tests are gtests. The gtests can be +run with the `mach gtest DevTools.*` command. The rest are integration sanity +tests to make sure we can read and save snapshots in various environments, such +as xpcshell or workers. These can be run with the usual `mach test $PATH` +commands. + +There are also `JS::ubi::Node` related unit tests in +`js/src/jit-test/tests/heap-analysis/*`, `js/src/jit-test/tests/debug/Memory-*`, +and `js/src/jsapi-tests/testUbiNode.cpp`. See +https://firefox-source-docs.mozilla.org/js/test.html#running-jit-tests-locally +for running the JIT tests. + +## `HeapAnalysesWorker` + +The `HeapAnalysesWorker` orchestrates running specific analyses on snapshots and +transforming the results into something that can simply and quickly be rendered +by the frontend. The analyses can take some time to run (sometimes on the order +of seconds), so doing them in a worker thread allows the interface to stay +responsive. The `HeapAnalysisClient` provides the main thread's interface to the +worker. + +The `HeapAnalysesWorker` doesn't actually do much itself; mostly just shuffling +data and transforming it from one representation to another or calling C++ +utility functions exposed by webidl that do those things. Most of these are +implemented as traversals of the resulting census or dominator trees. + +See the following files for details on the various data transformations and +shuffling that the `HeapAnalysesWorker` delegates to. + +* `devtools/shared/heapsnapshot/CensusUtils.js` +* `devtools/shared/heapsnapshot/CensusTreeNode.js` +* `devtools/shared/heapsnapshot/DominatorTreeNode.js` + +### Testing the `HeapAnalysesWorker` and `HeapAnalysesClient` + +Tests for the `HeapAnalysesWorker` and `HeapAnalysesClient` reside in +`devtools/shared/heapsnapshot/tests/**` and can be run with the usual `mach test +$PATH` command. + +## Frontend + +The frontend of the memory tool is built with React and Redux. + +[React has thorough documentation.](https://facebook.github.io/react/) + +[Redux has thorough documentation.](http://rackt.org/redux/index.html) + +We have React components in `devtools/client/memory/components/*`. + +We have Redux reducers in `devtools/client/memory/reducers/*`. + +We have Redux actions and action-creating tasks in +`devtools/client/memory/actions/*`. + +React components should be pure functions from their props to the rendered +(virtual) DOM. Redux reducers should also be observably pure. + +Impurity within the frontend is confined to the tasks that are creating and +dispatching actions. All communication with the outside world (such as the +`HeapAnalysesWorker`, the Remote DevTools Server, or the file system) is +restricted to within these tasks. + +### Snapshots State + +On the JavaScript side, the snapshots represent a reference to the underlying +heap dump and the various analyses. The following diagram represents a finite +state machine describing the snapshot states. Any of these states may go to the +ERROR state, from which they can never leave. + +``` +SAVING → SAVED → READING → READ + ↗ + IMPORTING +``` + +Each of the report types (census, diffing, tree maps, dominators) have their own states as well, and are documented at `devtools/client/memory/constants.js`. +These report states are updated as the various filtering and selecting options +are updated in the UI. + +### Testing the Frontend + +Unit tests for React components are in `devtools/client/memory/test/chrome/*`. + +Unit tests for actions, reducers, and state changes are in +`devtools/client/memory/test/xpcshell/*`. + +Holistic integration tests for the frontend and the whole memory tool are in +`devtools/client/memory/test/browser/*`. + +All tests can be run with the usual `mach test $PATH` command. diff --git a/devtools/docs/contributor/tools/responsive-design-mode.md b/devtools/docs/contributor/tools/responsive-design-mode.md new file mode 100644 index 0000000000..8b355c95d7 --- /dev/null +++ b/devtools/docs/contributor/tools/responsive-design-mode.md @@ -0,0 +1,75 @@ +# Responsive Design Mode Architecture + +## Context + +You have a single browser tab that has visited several pages, and now has a +history that looks like, in oldest to newest order: + +1. https://newsblur.com +2. https://mozilla.org (← current page) +3. https://convolv.es + +## Opening RDM During Current Firefox Session + +When opening RDM, the browser tab's history must preserved. Additionally, we +strive to preserve the exact state of the currently displayed page (effectively +any in-page state, which is important for single page apps where data can be +lost if they are reloaded). + +This seems a bit convoluted, but one advantage of this technique is that it +preserves tab state since the same tab is reused. This helps to maintain any +extra state that may be set on tab by add-ons or others. + +1. Create a temporary, hidden tab to load the tool UI. +2. Mark the tool tab browser's docshell as active so the viewport frame is + created eagerly and will be ready to swap. +3. Create the initial viewport inside the tool UI. +4. Swap tab content from the regular browser tab to the browser within the + viewport in the tool UI, preserving all state via + `gBrowser._swapBrowserDocShells`. +5. Force the original browser tab to be non-remote since the tool UI must be + loaded in the parent process, and we're about to swap the tool UI into + this tab. +6. Swap the tool UI (with viewport showing the content) into the original + browser tab and close the temporary tab used to load the tool via + `swapBrowsersAndCloseOther`. +7. Start a tunnel from the tool tab's browser to the viewport browser + so that some browser UI functions, like navigation, are connected to + the content in the viewport, instead of the tool page. + +## Closing RDM During Current Firefox Session + +To close RDM, we follow a similar process to the one from opening RDM so we can +restore the content back to a normal tab. + +1. Stop the tunnel between outer and inner browsers. +2. Create a temporary, hidden tab to hold the content. +3. Mark the content tab browser's docshell as active so the frame is created + eagerly and will be ready to swap. +4. Swap tab content from the browser within the viewport in the tool UI to the + regular browser tab, preserving all state via + `gBrowser._swapBrowserDocShells`. +5. Force the original browser tab to be remote since web content is loaded in + the child process, and we're about to swap the content into this tab. +6. Swap the content into the original browser tab and close the temporary tab + used to hold the content via `swapBrowsersAndCloseOther`. + +## Session Restore + +When restarting Firefox and restoring a user's browsing session, we must +correctly restore the tab history. If the RDM tool was opened when the session +was captured, then it would be acceptable to either: + +* A: Restore the tab content without any RDM tool displayed **OR** +* B: Restore the RDM tool the tab content inside, just as before the restart + +We currently follow path A (no RDM after session restore), which seems more in +line with how the rest of DevTools currently functions after restore. To do so, +we watch for `beforeunload` events on the tab at shutdown and quickly exit RDM +so that session restore records only the original page content during its final +write at shutdown. + +## List of Devices + +RDM is maintaining a list of popular mobile devices that can be used to quickly simulate a particular environment (screen resolution, pixel ratio, user agent, etc.) +[Learn more](/devtools/responsive/devices) about how this list is maintained and how it should be properly updated. diff --git a/devtools/docs/contributor/tools/storage.md b/devtools/docs/contributor/tools/storage.md new file mode 100644 index 0000000000..7a16eb2c65 --- /dev/null +++ b/devtools/docs/contributor/tools/storage.md @@ -0,0 +1,90 @@ +# Storage Panel Architecture + +## Actor structure + +### Legacy + +This is currently only used by the browser toolbox and when inspecting Web Extensions. + + + +- We have an actor per storage type. +- These actors are contained in a pool managed by a global `Storage` actor. See [source code of the actor](https://searchfox.org/mozilla-central/rev/2c991232499e826e46f9d976eb653817340ba389/devtools/server/actors/storage.js#3435) and [source code of the pool](https://searchfox.org/mozilla-central/rev/2c991232499e826e46f9d976eb653817340ba389/devtools/server/actors/storage.js#3477-3489) +- Each specific storage type actor has a reference back to this global `Storage` actor. + +### Resource-based + +This is the new architecture that is being implemented to support Fission. It's currently used when inspecting tabs. + + + +- We no longer have a global `Storage` actor. +- The specific actors for each storage type are spawned by watchers instead. +- The reference to a global `Storage` actor that each actor has now points to a mock instead. +- Some watchers require to be run in the parent process, while others can be run in the content process. + - Parent process: Cookies, IndexedDB, Web Extension[^web-extension-not-implemented]. + - Content process: LocalStorage, SessionStorage, Cache. + +[^web-extension-not-implemented]: Web Extension has not yet been implemented in this new architecture. + +## Flow + +Some considerations to keep in mind: + +- In the Storage Panel, **resources are fronts**. +- These fronts contain a `hosts` object, which is populated with the host name, and the actual storage data it contains. +- In the client, we get as part of the `onAvailable` callback of `ResourceCommand.watchResources`: + - Content process storage types: multiple resources, one per target + - Parent process storage types: a single resource + +### Initial load + +Web page loaded, open toolbox. Later on, we see what happens if a new remote target is added (for instance, an iframe is created that points to a different host). + +#### Fission OFF + + + +- We get all the storage fronts as new resources sent in the `onAvailable` callback for `watchResources`. +- After a remote target has been added, we get new additions as `"single-store-update"` events. + +#### Fission ON + + + +Similar to the previous scenario (fission off), but now when a new remote target is added: + +- We get content process storage resources in a new `onAvailable` callback, instead of `"single-store-update"`. +- Parent process storage resources keep using the `"single-store-update"` method. This is possible due to their `StorageMock` actors emitting a fake `"window-ready"` event after a `"window-global-created"`. + +### Navigation + +#### Fission ON, target switching OFF + + + +- Deletion of content process storage hosts is handled within the `onTargetDestroyed` callback. +- Deletion of parent process storage hosts is handled with `"single-store-update"` events, fired when the `StorageMock` detects a `"window-global-destroyed"` event. +- When the new target is available, new storage actors are spawned from their watchers' `watch` method and are sent as resources in the `onAvailable` callback. + +#### Fission ON, target switching ON + + + +Similar to the previous scenario (fission on, target switching off), but parent process storage resources are handled differently, since their watchers remain instantiated. + +- New actors for parent process resources are not spawned by their watchers `watch`, but as a callback of `"window-global-created"`. +- Some times there's a race condition between a target being available and firing `"window-global-created"`. There is a delay to send the resource to the client, to ensure that any `onTargetAvailable` callback is processed first. + - The new actor/resource is sent after a `"target-available-form"` event. + +### CRUD operations + +#### Add a new cookie + +Other CRUD operations work very similar to this one. + + + +- We call `StorageMock.getWindowFromHost` so we can get the storage principal. Since this is a parent process resource, it doesn't have access to an actual window, so it returns a mock instead (but with a real principal). +- To detect changes in storage, we subscribe to different events that platform provides via `Services.obs.addObserver`. +- To manipulate storage data, we use different methods depending on the storage type. For cookies, we use the API provided by `Services.cookies`. diff --git a/devtools/docs/contributor/tools/storage/crud-cookie.svg b/devtools/docs/contributor/tools/storage/crud-cookie.svg new file mode 100644 index 0000000000..5a4671a0df --- /dev/null +++ b/devtools/docs/contributor/tools/storage/crud-cookie.svg @@ -0,0 +1,6 @@ +<!-- 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/. --> +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> +<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="1052px" height="527px" viewBox="-0.5 -0.5 1052 527" content="<mxfile host="Electron" modified="2021-06-09T15:53:37.452Z" agent="5.0 (Macintosh; Intel Mac OS X 11_4_0) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/14.6.13 Chrome/89.0.4389.128 Electron/12.0.7 Safari/537.36" version="14.6.13" etag="EwVAYTYE5uQF3ssIPhho" type="device"><diagram 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align-items: unsafe center; justify-content: unsafe center; width: 148px; height: 1px; padding-top: 270px; margin-left: 136px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">parent storage types: 1 front<br />content storage types: 1 front per target</div></div></div></foreignObject><text x="210" y="272" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">parent storage types: 1 front...</text></switch></g><rect x="1050" y="90" width="150" height="60" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><path d="M 1125 150 L 1125 720" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" stroke-dasharray="4.5 4.5" pointer-events="all"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="18px"><text x="1124.5" y="116.5">Cookies</text><text x="1124.5" y="137.5">(actor)</text></g><rect x="1117.5" y="491.25" width="15" height="63.75" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><path d="M 966.75 491.25 L 1104.57 491.25" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1115.07 491.25 L 1104.57 496.5 L 1104.57 486 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 426px; margin-left: 639px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">emit("single-store-update")</div></div></div></foreignObject><text x="639" y="426" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">emit("single-sto...</text></switch></g><rect x="187.5" y="660" width="15" height="90" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><path d="M 1115.25 689.25 L 213.18 689.96" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 202.68 689.97 L 213.17 684.71 L 213.18 695.21 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; 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justify-content: unsafe flex-start; width: 288px; height: 1px; padding-top: 40px; margin-left: 482px;"><div style="box-sizing: border-box; font-size: 0; text-align: left; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: normal; word-wrap: normal; ">Note: IndexedDB does the same things.</div></div></div></foreignObject><text x="482" y="43" fill="#000000" font-family="Helvetica" font-size="10px">Note: IndexedDB does the same things.</text></switch></g><rect x="187.5" y="780" width="480" height="150" fill="#f5f5f5" stroke="#666666" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 312px; height: 1px; padding-top: 510px; margin-left: 130px;"><div style="box-sizing: border-box; font-size: 0; text-align: left; max-height: 110px; overflow: hidden; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #333333; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; "><h1>Notes:</h1><p></p><ul><li>Storage resources are actually <b>fronts</b>.</li><li><b>Content process resources</b> are: localStorage, sessionStorage and Cache</li><li><b>Parent process resources</b> are: cookies and IndexedDB</li></ul><p></p></div></div></div></foreignObject><text x="130" y="520" fill="#333333" font-family="Helvetica" font-size="10px">Notes:...</text></switch></g><rect x="1380" y="90" width="150" height="60" fill="#fff2cc" stroke="#d6b656" stroke-width="1.5" pointer-events="all"/><path d="M 1455 150 L 1455 720" fill="none" stroke="#d6b656" stroke-width="1.5" stroke-miterlimit="10" stroke-dasharray="4.5 4.5" pointer-events="all"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="18px"><text x="1454.5" y="116.5">StorageActorMock</text><text x="1454.5" y="137.5">(content p.)</text></g><rect x="1545" y="90" width="150" height="60" fill="#fff2cc" stroke="#d6b656" stroke-width="1.5" pointer-events="all"/><path d="M 1620 150 L 1620 765" fill="none" stroke="#d6b656" stroke-width="1.5" stroke-miterlimit="10" stroke-dasharray="4.5 4.5" pointer-events="all"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="18px"><text x="1619.5" y="116.5">LocalStorage</text><text x="1619.5" y="137.5">(actor)</text></g><rect x="1612.5" y="491.25" width="15" height="63.75" fill="#fff2cc" stroke="#d6b656" stroke-width="1.5" pointer-events="all"/><path d="M 1461.75 491.25 L 1599.57 491.25" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1610.07 491.25 L 1599.57 496.5 L 1599.57 486 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; 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text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-end; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 346px; margin-left: 1024px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">update("added")</div></div></div></foreignObject><text x="1024" y="346" fill="#000000" font-family="Helvetica" font-size="10px" text-anchor="middle">update("added")</text></switch></g><rect x="1215" y="90" width="150" height="60" fill="#fff2cc" stroke="#d6b656" stroke-width="1.5" pointer-events="all"/><path d="M 1290 150 L 1290 705" fill="none" stroke="#d6b656" stroke-width="1.5" stroke-miterlimit="10" stroke-dasharray="4.5 4.5" pointer-events="all"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="18px"><text x="1289.5" y="116.5">LocalStorage</text><text x="1289.5" y="137.5">Watcher</text></g><rect x="1282.5" y="568.5" width="15" height="106.5" fill="#fff2cc" stroke="#d6b656" stroke-width="1.5" pointer-events="all"/><rect x="1447.5" y="568.5" width="15" height="46.5" fill="#fff2cc" stroke="#d6b656" stroke-width="1.5" pointer-events="all"/><path d="M 1446.75 568.5 L 1308.93 568.5" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 1298.43 568.5 L 1308.93 563.25 L 1308.93 573.75 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; 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things</div></div></div></foreignObject><text x="482" y="53" fill="#000000" font-family="Helvetica" font-size="10px">Note: IndexedDB does the same things</text></switch></g><rect x="187.5" y="780" width="480" height="150" fill="#f5f5f5" stroke="#666666" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-start; width: 312px; height: 1px; padding-top: 510px; margin-left: 130px;"><div style="box-sizing: border-box; font-size: 0; text-align: left; max-height: 110px; overflow: hidden; "><div style="display: inline-block; font-size: 10px; font-family: Helvetica; color: #333333; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: 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font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">indexedDB</div></div></div></foreignObject><text x="190" y="196" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">indexedDB</text></switch></g><rect x="195" y="340.5" width="180" height="45" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 242px; margin-left: 131px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">cookies</div></div></div></foreignObject><text x="190" y="246" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">cookies</text></switch></g><rect x="0" y="190.5" width="120" height="45" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 78px; height: 1px; padding-top: 142px; margin-left: 1px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Actor</div></div></div></foreignObject><text x="40" y="146" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">Actor</text></switch></g><path d="M 195 213 L 147.18 213" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 121.68 213 L 147.18 200.25 L 147.18 225.75 Z" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><path d="M 195 363 L 165 363 L 165 63 L 195 63" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 165 138 L 195 138" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 165 288 L 195 288" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><rect x="480" y="108" width="180" height="60" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 92px; margin-left: 321px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">StorageActorMock<br />(content process)</div></div></div></foreignObject><text x="380" y="96" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">StorageActorMock...</text></switch></g><rect x="480" y="295.5" width="180" height="60" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 217px; margin-left: 321px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">StorageActorMock<br />(parent process)</div></div></div></foreignObject><text x="380" y="221" fill="#000000" font-family="Helvetica" font-size="12px" text-anchor="middle">StorageActorMock...</text></switch></g><rect x="491.25" y="168" width="157.5" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 103px; height: 1px; padding-top: 122px; margin-left: 329px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">In legacy, an actual Storage actor is used</div></div></div></foreignObject><text x="380" y="124" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">In legacy, an actual Stora...</text></switch></g><path d="M 375 138 L 470.45 138" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 478.32 138 L 467.82 143.25 L 470.45 138 L 467.82 132.75 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; 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align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 228px; margin-left: 281px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">storageActor</div></div></div></foreignObject><text x="281" y="230" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">storageActor</text></switch></g><rect x="960" y="108" width="180" height="60" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 92px; margin-left: 641px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">ContentProcessStorage<br style="font-size: 11px" />(watcher)</div></div></div></foreignObject><text x="700" y="95" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">ContentProcessStorage...</text></switch></g><rect x="960" y="295.5" width="180" height="60" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 217px; margin-left: 641px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">ParentProcessStorage<br style="font-size: 11px" />(watcher)</div></div></div></foreignObject><text x="700" y="220" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">ParentProcessStorage...</text></switch></g><rect x="720" y="115.5" width="180" height="45" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 92px; margin-left: 481px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">LocalStorageWatcher</div></div></div></foreignObject><text x="540" y="95" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">LocalStorageWatcher</text></switch></g><rect x="720" y="303" width="180" height="45" fill="#ffffff" stroke="#000000" stroke-width="1.5" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 217px; margin-left: 481px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">CookieWatcher</div></div></div></foreignObject><text x="540" y="220" fill="#000000" font-family="Helvetica" font-size="11px" text-anchor="middle">CookieWatcher</text></switch></g><path d="M 900 325.5 L 932.82 325.5" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 958.32 325.5 L 932.82 338.25 L 932.82 312.75 Z" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><path d="M 900 137.63 L 932.82 137.63" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 958.32 137.63 L 932.82 150.38 L 932.82 124.88 Z" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><path d="M 810 115.5 L 810 10.5 L 285 10.5 L 285 30.95" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 285 38.82 L 279.75 28.32 L 285 30.95 L 290.25 28.32 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 46px; margin-left: 541px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">actor</div></div></div></foreignObject><text x="541" y="48" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">actor</text></switch></g><rect x="491.25" y="355.5" width="157.5" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 103px; height: 1px; padding-top: 247px; margin-left: 329px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">In legacy, an actual Storage actor is used</div></div></div></foreignObject><text x="380" y="249" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">In legacy, an actual Stora...</text></switch></g><path d="M 810 348 L 810 415.5 L 285 415.5 L 285 395.05" fill="none" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 285 387.18 L 290.25 397.68 L 285 395.05 L 279.75 397.68 Z" fill="#000000" stroke="#000000" stroke-width="1.5" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 253px; margin-left: 541px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; background-color: #ffffff; white-space: nowrap; ">actor</div></div></div></foreignObject><text x="541" y="255" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">actor</text></switch></g><rect x="731.25" y="168" width="157.5" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 103px; height: 1px; padding-top: 122px; margin-left: 489px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">SessionStorageWatcher and CacheWatcher also exist</div></div></div></foreignObject><text x="540" y="124" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">SessionStorageWatcher and...</text></switch></g><rect x="731.25" y="265.5" width="157.5" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 103px; height: 1px; padding-top: 187px; margin-left: 489px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">IndexedDBWatcher also exists</div></div></div></foreignObject><text x="540" y="189" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">IndexedDBWatcher also exis...</text></switch></g><rect x="971.25" y="355.5" width="157.5" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 103px; height: 1px; padding-top: 247px; margin-left: 649px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">This watcher emits fronts as resources</div></div></div></foreignObject><text x="700" y="249" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">This watcher emits fronts...</text></switch></g><rect x="971.25" y="168" width="157.5" height="30" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)scale(1.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 103px; height: 1px; padding-top: 122px; margin-left: 649px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; "><div style="display: inline-block; font-size: 8px; font-family: Helvetica; color: #000000; line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">This watcher emits fronts as resources</div></div></div></foreignObject><text x="700" y="124" fill="#000000" font-family="Helvetica" font-size="8px" text-anchor="middle">This watcher emits fronts...</text></switch></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Viewer does not support full SVG 1.1</text></a></switch></svg>
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