Add conditional disabling of features incompatible with multiple hosts

config/gni/devtools_grd_files.gni

@@ -995,7 +995,7 @@ grd_files_debug_sources = [
   "front_end/entrypoints/node_app/NodeMain.js",
   "front_end/entrypoints/node_app/nodeConnectionsPanel.css.js",
   "front_end/entrypoints/rn_fusebox/FuseboxAppMetadataObserver.js",
-  "front_end/entrypoints/rn_fusebox/FuseboxExperimentsObserver.js",
+  "front_end/entrypoints/rn_fusebox/FuseboxFeatureObserver.js",
   "front_end/entrypoints/rn_fusebox/FuseboxReconnectDeviceButton.js",
   "front_end/entrypoints/rn_fusebox/FuseboxWindowTitleManager.js",
   "front_end/entrypoints/shell/browser_compatibility_guard.js",

front_end/core/sdk/ReactNativeApplicationModel.ts

@@ -52,6 +52,10 @@ export class ReactNativeApplicationModel extends SDKModel<EventTypes> implements
     this.dispatchEventToListeners(Events.METADATA_UPDATED, metadata);
   }
 
+  systemStateChanged(params: Protocol.ReactNativeApplication.SystemStateChangedEvent): void {
+    this.dispatchEventToListeners(Events.SYSTEM_STATE_CHANGED, params);
+  }
+
   traceRequested(): void {
     Host.rnPerfMetrics.traceRequested();
     this.dispatchEventToListeners(Events.TRACE_REQUESTED);
@@ -60,10 +64,12 @@ export class ReactNativeApplicationModel extends SDKModel<EventTypes> implements
 
 export const enum Events {
   METADATA_UPDATED = 'MetadataUpdated',
+  SYSTEM_STATE_CHANGED = 'SystemStateChanged',
   TRACE_REQUESTED = 'TraceRequested',
 }
 
 export interface EventTypes {
   [Events.METADATA_UPDATED]: Protocol.ReactNativeApplication.MetadataUpdatedEvent;
+  [Events.SYSTEM_STATE_CHANGED]: Protocol.ReactNativeApplication.SystemStateChangedEvent;
   [Events.TRACE_REQUESTED]: void;
 }

front_end/entrypoints/rn_fusebox/BUILD.gn

@@ -11,7 +11,7 @@ devtools_module("rn_fusebox") {
   sources = [
     "FuseboxAppMetadataObserver.ts",
     "FuseboxReconnectDeviceButton.ts",
-    "FuseboxExperimentsObserver.ts",
+    "FuseboxFeatureObserver.ts",
     "FuseboxWindowTitleManager.ts",
   ]
 

front_end/entrypoints/rn_fusebox/FuseboxFeatureObserver.ts

@@ -0,0 +1,245 @@
+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// Copyright 2024 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import type * as Common from '../../core/common/common.js';
+import * as i18n from '../../core/i18n/i18n.js';
+import * as Root from '../../core/root/root.js';
+import * as SDK from '../../core/sdk/sdk.js';
+import type * as Protocol from '../../generated/protocol.js';
+import * as UI from '../../ui/legacy/legacy.js';
+import * as Lit from '../../ui/lit/lit.js';
+import * as VisualLogging from '../../ui/visual_logging/visual_logging.js';
+
+import {FuseboxWindowTitleManager} from './FuseboxWindowTitleManager.js';
+
+const {html, render} = Lit;
+
+const UIStrings = {
+  /**
+   * @description Message for the "settings changed" banner shown when a reload is required for the Network panel.
+   */
+  reloadRequiredForNetworkPanelMessage: 'The Network panel is now available for dogfooding. Please reload to access it.',
+  /**
+   * @description Title shown when Network inspection is disabled due to multiple React Native hosts.
+   */
+  networkInspectionUnavailable: 'Network inspection is unavailable',
+  /**
+   * @description Title shown when Performance profiling is disabled due to multiple React Native hosts.
+   */
+  performanceProfilingUnavailable: 'Performance profiling is unavailable',
+  /**
+   * @description Title shown when a feature is unavailable due to multiple React Native hosts.
+   */
+  multiHostFeatureUnavailableTitle: 'Feature is unavailable',
+  /**
+   * @description Detail message shown when a feature is disabled due to multiple React Native hosts.
+   */
+  multiHostFeatureDisabledDetail: 'This feature is disabled as the app or framework has registered multiple React Native hosts, which is not currently supported.',
+} as const;
+
+const str_ = i18n.i18n.registerUIStrings('entrypoints/rn_fusebox/FuseboxFeatureObserver.ts', UIStrings);
+const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
+
+/**
+ * The set of features that are not guaranteed to behave safely with multiple
+ * React Native hosts.
+ */
+const UNSAFE_MULTI_HOST_FEATURES = new Set([
+  'network',
+  'timeline',
+]);
+
+/**
+ * [RN] Model observer which configures available DevTools features and
+ * experiments based on the target's capabilities.
+ */
+export class FuseboxFeatureObserver implements
+    SDK.TargetManager.SDKModelObserver<SDK.ReactNativeApplicationModel.ReactNativeApplicationModel> {
+  #singleHostFeaturesDisabled = false;
+
+  constructor(targetManager: SDK.TargetManager.TargetManager) {
+    targetManager.observeModels(SDK.ReactNativeApplicationModel.ReactNativeApplicationModel, this);
+  }
+
+  modelAdded(model: SDK.ReactNativeApplicationModel.ReactNativeApplicationModel): void {
+    model.ensureEnabled();
+    model.addEventListener(SDK.ReactNativeApplicationModel.Events.METADATA_UPDATED, this.#handleMetadataUpdated, this);
+    model.addEventListener(SDK.ReactNativeApplicationModel.Events.SYSTEM_STATE_CHANGED, this.#handleSystemStateChanged, this);
+  }
+
+  modelRemoved(model: SDK.ReactNativeApplicationModel.ReactNativeApplicationModel): void {
+    model.removeEventListener(
+        SDK.ReactNativeApplicationModel.Events.METADATA_UPDATED, this.#handleMetadataUpdated, this);
+    model.removeEventListener(
+        SDK.ReactNativeApplicationModel.Events.SYSTEM_STATE_CHANGED, this.#handleSystemStateChanged, this);
+  }
+
+  #handleMetadataUpdated(
+      event: Common.EventTarget.EventTargetEvent<Protocol.ReactNativeApplication.MetadataUpdatedEvent>): void {
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    const {unstable_isProfilingBuild, unstable_networkInspectionEnabled} = event.data;
+
+    if (unstable_isProfilingBuild) {
+      FuseboxWindowTitleManager.instance().setSuffix('[PROFILING]');
+      this.#hideUnsupportedFeaturesForProfilingBuilds();
+    }
+
+    if (unstable_networkInspectionEnabled) {
+      this.#ensureNetworkPanelEnabled();
+    }
+  }
+
+  #handleSystemStateChanged(
+      event: Common.EventTarget.EventTargetEvent<Protocol.ReactNativeApplication.SystemStateChangedEvent>): void {
+    const {isSingleHost} = event.data;
+    if (!isSingleHost) {
+      this.#disableSingleHostOnlyFeatures();
+    }
+  }
+
+  #hideUnsupportedFeaturesForProfilingBuilds(): void {
+    UI.InspectorView.InspectorView.instance().closeDrawer();
+
+    const viewManager = UI.ViewManager.ViewManager.instance();
+    const panelLocationPromise = viewManager.resolveLocation(UI.ViewManager.ViewLocationValues.PANEL);
+    const drawerLocationPromise = viewManager.resolveLocation(UI.ViewManager.ViewLocationValues.DRAWER_VIEW);
+    void Promise.all([panelLocationPromise, drawerLocationPromise])
+      .then(([panelLocation, drawerLocation]) => {
+        UI.ViewManager.getRegisteredViewExtensions().forEach(view => {
+          if (view.location() === UI.ViewManager.ViewLocationValues.DRAWER_VIEW) {
+            drawerLocation?.removeView(view);
+          } else {
+            switch (view.viewId()) {
+              case 'console':
+              case 'heap-profiler':
+              case 'live-heap-profile':
+              case 'sources':
+              case 'network':
+              case 'react-devtools-components':
+              case 'react-devtools-profiler':
+                panelLocation?.removeView(view);
+                break;
+            }
+          }
+        });
+      });
+  }
+
+  #ensureNetworkPanelEnabled(): void {
+    if (Root.Runtime.experiments.isEnabled(Root.Runtime.ExperimentName.ENABLE_NETWORK_PANEL)) {
+      return;
+    }
+
+    Root.Runtime.experiments.setEnabled(
+        Root.Runtime.ExperimentName.ENABLE_NETWORK_PANEL,
+        true,
+    );
+
+    UI.InspectorView?.InspectorView?.instance()?.displayReloadRequiredWarning(
+        i18nString(UIStrings.reloadRequiredForNetworkPanelMessage),
+    );
+  }
+
+  #disableSingleHostOnlyFeatures(): void {
+    if (this.#singleHostFeaturesDisabled) {
+      return;
+    }
+
+    // Disable relevant CDP domains
+    const targetManager = SDK.TargetManager.TargetManager.instance();
+    for (const target of targetManager.targets()) {
+      void target.networkAgent().invoke_disable();
+    }
+
+    // Stop network recording if active
+    void this.#disableNetworkRecording();
+
+    // Show in-panel overlay when disabled panels are selected
+    const inspectorView = UI.InspectorView.InspectorView.instance();
+    const overlaidPanels = new Set<string>();
+
+    const showPanelOverlay = (panel: UI.Panel.Panel, panelId: string): void => {
+      const titleText =
+        panelId === 'network'
+          ? i18nString(UIStrings.networkInspectionUnavailable)
+          : panelId === 'timeline'
+          ? i18nString(UIStrings.performanceProfilingUnavailable)
+          : i18nString(UIStrings.multiHostFeatureUnavailableTitle);
+
+      // Dim the existing panel content and disable interaction
+      for (const child of panel.element.children) {
+        const element = child as HTMLElement;
+        element.style.opacity = '0.5';
+        element.style.pointerEvents = 'none';
+        element.setAttribute('inert', '');
+        element.setAttribute('aria-hidden', 'true');
+      }
+
+      const alertBar = document.createElement('div');
+      render(html`
+        <style>
+          .alert-bar {
+            background: var(--sys-color-tonal-container);
+            color: var(--sys-color-on-tonal-container);
+            padding: var(--sys-size-6) var(--sys-size-8);
+            border-bottom: 1px solid var(--sys-color-tonal-outline);
+          }
+          .alert-title {
+            font: var(--sys-typescale-body2-medium);
+            margin-bottom: var(--sys-size-3);
+          }
+          .alert-detail {
+            font: var(--sys-typescale-body4-regular);
+          }
+        </style>
+        <div class="alert-bar">
+          <div class="alert-title">${titleText}</div>
+          <div class="alert-detail">
+            ${i18nString(UIStrings.multiHostFeatureDisabledDetail)}
+            See <x-link href="https://github.com/react-native-community/discussions-and-proposals/discussions/954" class="devtools-link" jslog=${VisualLogging.link().track({click: true, keydown:'Enter|Space'}).context('multi-host-learn-more')}>discussions/954</x-link>.
+          </div>
+        </div>
+      `, alertBar, {host: this});
+
+      panel.element.insertBefore(alertBar, panel.element.firstChild);
+    };
+
+    inspectorView.tabbedPane.addEventListener(UI.TabbedPane.Events.TabSelected, event => {
+      const tabId = event.data.tabId;
+      if (UNSAFE_MULTI_HOST_FEATURES.has(tabId) && !overlaidPanels.has(tabId)) {
+        overlaidPanels.add(tabId);
+        void inspectorView.panel(tabId).then(panel => {
+          if (panel) {
+            showPanelOverlay(panel, tabId);
+          }
+        });
+      }
+    });
+
+    // Show overlay if a disabled panel is currently selected
+    const currentTabId = inspectorView.tabbedPane.selectedTabId;
+    if (currentTabId && UNSAFE_MULTI_HOST_FEATURES.has(currentTabId)) {
+      overlaidPanels.add(currentTabId);
+      void inspectorView.panel(currentTabId).then(panel => {
+        if (panel) {
+          showPanelOverlay(panel, currentTabId);
+        }
+      });
+    }
+
+    this.#singleHostFeaturesDisabled = true;
+  }
+
+  async #disableNetworkRecording(): Promise<void> {
+    const inspectorView = UI.InspectorView.InspectorView.instance();
+    try {
+      const networkPanel = await inspectorView.panel('network');
+      if (networkPanel && 'toggleRecord' in networkPanel) {
+        (networkPanel as UI.Panel.Panel & {toggleRecord: (toggled: boolean) => void}).toggleRecord(false);
+      }
+    } catch {
+    }
+  }
+}

front_end/entrypoints/rn_fusebox/rn_fusebox.ts

@@ -27,7 +27,7 @@ import * as UI from '../../ui/legacy/legacy.js';
 import * as Main from '../main/main.js';
 
 import * as FuseboxAppMetadataObserverModule from './FuseboxAppMetadataObserver.js';
-import * as FuseboxFeatureObserverModule from './FuseboxExperimentsObserver.js';
+import * as FuseboxFeatureObserverModule from './FuseboxFeatureObserver.js';
 import * as FuseboxReconnectDeviceButtonModule from './FuseboxReconnectDeviceButton.js';
 
 // To ensure accurate timing measurements, please make sure these perf metrics