Show a warning in the Dart Debug Extension when a user tries to debug a sharded Dart app (#1462)

Author: elliette

dwds/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 11.5.2-dev
+
+- Show an alert in the Dart Debug Extension for a multi-app scenario.
+
 ## 11.5.1
 
 - Update SDK contraint to `>=2.15.0 <3.0.0`.
@@ -18,7 +22,7 @@
 - Fix chrome detection in iPhone emulation mode in chrome or edge browsers.
 - Reliably find unused port for extension backend http service.
 - Ignore offset / count parameters in getObject if the object has no length.
-- Include static member information for classes
+- Include static member information for classes.
 
 ## 11.4.0
 

dwds/debug_extension/CHANGELOG.md

@@ -1,9 +1,12 @@
+## 1.24
+
+- Detect Dart applications in multi-app environments and show an alert.
+
 ## 1.23
 
 - Depend on the latest `package:sse` to improve stability of the connection with many
   concurrent requests. 
 
-
 ## 1.22
 
 - Detect Dart applications and update the icon accordingly.

dwds/debug_extension/pubspec.yaml

@@ -1,6 +1,6 @@
 name: extension
 publish_to: none
-version: 1.23.0
+version: 1.24.0
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/webdev
 description: >-

dwds/debug_extension/web/background.dart

@@ -38,6 +38,9 @@ const _allowedEvents = {'Overlay.inspectNodeRequested'};
 // Map of Chrome tab ID to encoded vm service protocol URI.
 final _tabIdToEncodedUri = <int, String>{};
 
+// Map of Chrome tab ID to warnings for that tab.
+final _tabIdToWarning = <int, String>{};
+
 final _debuggableTabs = <int>{};
 
 final _tabsToAttach = <Tab>{};
@@ -67,6 +70,12 @@ void main() {
     var callback = allowInterop((List<Tab> tabs) async {
       currentTab = tabs[0];
       if (!_debuggableTabs.contains(currentTab.id)) return;
+
+      if (_tabIdToWarning.containsKey(currentTab.id)) {
+        alert(_tabIdToWarning[currentTab.id]);
+        return;
+      }
+
       attach(Debuggee(tabId: currentTab.id), '1.3', allowInterop(() async {
         if (lastError != null) {
           String alertMessage;
@@ -100,6 +109,10 @@ void main() {
 
   onMessageAddListener(allowInterop(
       (Request request, Sender sender, Function sendResponse) async {
+    // Register any warnings for the tab:
+    if (request.warning != '') {
+      _tabIdToWarning[sender.tab.id] = request.warning;
+    }
     _debuggableTabs.add(sender.tab.id);
     _updateIcon();
     // TODO(grouma) - We can conditionally auto start debugging here.
@@ -362,9 +375,20 @@ void _updateIcon() {
   var query = QueryInfo(active: true, currentWindow: true);
   queryTabs(query, allowInterop((List tabs) {
     var tabList = List<Tab>.from(tabs);
-    if (tabList.isEmpty || _debuggableTabs.contains(tabList.first.id)) {
+    // If tabList is empty, the user has likely navigated to a different window.
+    // Therefore, do not update the icon:
+    if (tabList.isEmpty || tabList.first == null || tabList.first.id == null) {
+      return;
+    }
+
+    if (_tabIdToWarning.containsKey(tabList.first.id)) {
+      // Set the warning icon (red):
+      setIcon(IconInfo(path: 'dart_warning.png'));
+    } else if (_debuggableTabs.contains(tabList.first.id)) {
+      // Set the debuggable icon (blue):
       setIcon(IconInfo(path: 'dart.png'));
     } else {
+      // Set the default icon (grey):
       setIcon(IconInfo(path: 'dart_grey.png'));
     }
   }));
@@ -514,6 +538,7 @@ class Request {
   external int get tabId;
   external String get name;
   external dynamic get options;
+  external String get warning;
   external factory Request({int tabId, String name, dynamic options});
 }