Merge branch 'master' into feat/lints-4-0

dwds/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 - Fix bug where debugging clients are not aware of service extensions when connecting to a new web app. - [#2388](https://github.com/dart-lang/webdev/pull/2388)
 - Respect the value of `pause_isolates_on_start` during page-refreshes. - [#2431](https://github.com/dart-lang/webdev/pull/2431)
+- Fix issue where DAP clients wouldn't resume after a restart. - [#2441](https://github.com/dart-lang/webdev/pull/2441)
+- Add implementation for the VM Service's `getFlagList` API. - [#2438](https://github.com/dart-lang/webdev/pull/2438)
 
 ## 24.0.0
 

dwds/lib/src/dwds_vm_client.dart

@@ -28,6 +28,7 @@ typedef VmResponse = Map<String, Object?>;
 
 enum _NamespacedServiceExtension {
   extDwdsEmitEvent(method: 'ext.dwds.emitEvent'),
+  extDwdsReload(method: 'ext.dwds.reload'),
   extDwdsRestart(method: 'ext.dwds.restart'),
   extDwdsScreenshot(method: 'ext.dwds.screenshot'),
   extDwdsSendEvent(method: 'ext.dwds.sendEvent'),
@@ -77,6 +78,8 @@ class DwdsVmClient {
     final requestSink = requestController.sink;
     final requestStream = requestController.stream;
 
+    final clientCompleter = Completer<VmService>();
+
     _setUpVmServerConnection(
       chromeProxyService: chromeProxyService,
       debugService: debugService,
@@ -85,6 +88,7 @@ class DwdsVmClient {
       requestStream: requestStream,
       requestSink: requestSink,
       dwdsStats: dwdsStats,
+      clientFuture: clientCompleter.future,
     );
 
     final client = ddsUri == null
@@ -97,6 +101,10 @@ class DwdsVmClient {
             ddsUri: ddsUri,
           );
 
+    if (!clientCompleter.isCompleted) {
+      clientCompleter.complete(client);
+    }
+
     final dwdsVmClient =
         DwdsVmClient(client, requestController, responseController);
 
@@ -158,12 +166,14 @@ class DwdsVmClient {
     required StreamSink<VmResponse> responseSink,
     required Stream<VmRequest> requestStream,
     required StreamSink<VmRequest> requestSink,
+    required Future<VmService> clientFuture,
   }) {
     responseStream.listen((request) async {
       final response = await _maybeHandleServiceExtensionRequest(
         request,
         chromeProxyService: chromeProxyService,
         dwdsStats: dwdsStats,
+        clientFuture: clientFuture,
       );
       if (response != null) {
         requestSink.add(response);
@@ -187,15 +197,19 @@ class DwdsVmClient {
     VmResponse request, {
     required ChromeProxyService chromeProxyService,
     required DwdsStats dwdsStats,
+    required Future<VmService> clientFuture,
   }) async {
     VmRequest? response;
     final method = request['method'];
     if (method == _NamespacedServiceExtension.flutterListViews.method) {
       response = await _flutterListViewsHandler(chromeProxyService);
     } else if (method == _NamespacedServiceExtension.extDwdsEmitEvent.method) {
       response = _extDwdsEmitEventHandler(request);
+    } else if (method == _NamespacedServiceExtension.extDwdsReload.method) {
+      response = await _extDwdsReloadHandler(chromeProxyService);
     } else if (method == _NamespacedServiceExtension.extDwdsRestart.method) {
-      response = await _extDwdsRestartHandler(chromeProxyService);
+      final client = await clientFuture;
+      response = await _extDwdsRestartHandler(chromeProxyService, client);
     } else if (method == _NamespacedServiceExtension.extDwdsSendEvent.method) {
       response = await _extDwdsSendEventHandler(request, dwdsStats);
     } else if (method == _NamespacedServiceExtension.extDwdsScreenshot.method) {
@@ -265,13 +279,21 @@ class DwdsVmClient {
     return {'result': Success().toJson()};
   }
 
-  static Future<Map<String, Object>> _extDwdsRestartHandler(
+  static Future<Map<String, Object>> _extDwdsReloadHandler(
     ChromeProxyService chromeProxyService,
   ) async {
     await _fullReload(chromeProxyService);
     return {'result': Success().toJson()};
   }
 
+  static Future<Map<String, Object>> _extDwdsRestartHandler(
+    ChromeProxyService chromeProxyService,
+    VmService client,
+  ) async {
+    await _hotRestart(chromeProxyService, client);
+    return {'result': Success().toJson()};
+  }
+
   static Future<void> _registerServiceExtensions({
     required VmService client,
     required ChromeProxyService chromeProxyService,

dwds/lib/src/services/chrome_proxy_service.dart

@@ -92,12 +92,20 @@ class ChromeProxyService implements VmServiceInterface {
 
   StreamSubscription<ConsoleAPIEvent>? _consoleSubscription;
 
-  bool _pauseIsolatesOnStart = false;
+  /// The flags that can be set at runtime via [setFlag] and their respective
+  /// values.
+  final Map<String, bool> _currentVmServiceFlags = {
+    _pauseIsolatesOnStartFlag: false,
+  };
 
   /// The value of the [_pauseIsolatesOnStartFlag].
   ///
   /// This value can be updated at runtime via [setFlag].
-  bool get pauseIsolatesOnStart => _pauseIsolatesOnStart;
+  bool get pauseIsolatesOnStart =>
+      _currentVmServiceFlags[_pauseIsolatesOnStartFlag] ?? false;
+
+  /// Whether or not the connected app has a pending restart.
+  bool get hasPendingRestart => _resumeAfterRestartEventsController.hasListener;
 
   final _resumeAfterRestartEventsController =
       StreamController<String>.broadcast();
@@ -353,6 +361,20 @@ class ChromeProxyService implements VmServiceInterface {
       );
     }
 
+    // If the new isolate was created as part of a restart, send a
+    // kPausePostRequest event to notify client that the app is paused so that
+    // it can resume:
+    if (hasPendingRestart) {
+      _streamNotify(
+        'Debug',
+        Event(
+          kind: EventKind.kPausePostRequest,
+          timestamp: timestamp,
+          isolate: isolateRef,
+        ),
+      );
+    }
+
     // The service is considered initialized when the first isolate is created.
     if (!_initializedCompleter.isCompleted) _initializedCompleter.complete();
   }
@@ -758,9 +780,22 @@ ${globalToolConfiguration.loadStrategy.loadModuleSnippet}("dart_sdk").developer.
   }
 
   @override
-  Future<FlagList> getFlagList() async {
-    // VM flags do not apply to web apps.
-    return FlagList(flags: []);
+  Future<FlagList> getFlagList() {
+    return wrapInErrorHandlerAsync(
+      'getFlagList',
+      _getFlagList,
+    );
+  }
+
+  Future<FlagList> _getFlagList() {
+    final flags = _currentVmServiceFlags.entries.map<Flag>(
+      (entry) => Flag(
+        name: entry.key,
+        valueAsString: '${entry.value}',
+      ),
+    );
+
+    return Future.value(FlagList(flags: flags.toList()));
   }
 
   @override
@@ -1214,14 +1249,12 @@ ${globalToolConfiguration.loadStrategy.loadModuleSnippet}("dart_sdk").developer.
       );
 
   Future<Success> _setFlag(String name, String value) async {
-    if (!_supportedVmServiceFlags.contains(name)) {
+    if (!_currentVmServiceFlags.containsKey(name)) {
       return _rpcNotSupportedFuture('setFlag');
     }
 
-    if (name == _pauseIsolatesOnStartFlag) {
-      assert(value == 'true' || value == 'false');
-      _pauseIsolatesOnStart = value == 'true';
-    }
+    assert(value == 'true' || value == 'false');
+    _currentVmServiceFlags[name] = value == 'true';
 
     return Success();
   }
@@ -1699,8 +1732,3 @@ const _stderrTypes = ['error'];
 const _stdoutTypes = ['log', 'info', 'warning'];
 
 const _pauseIsolatesOnStartFlag = 'pause_isolates_on_start';
-
-/// The flags that can be set at runtime via [setFlag].
-const _supportedVmServiceFlags = {
-  _pauseIsolatesOnStartFlag,
-};

dwds/test/chrome_proxy_service_test.dart

@@ -2099,6 +2099,38 @@ void main() {
       });
     });
 
+    group('getFlagList', () {
+      List<String> stringifyFlags(FlagList flagList) {
+        return flagList.flags
+                ?.map((flag) => '${flag.name} -> ${flag.valueAsString}')
+                .toList() ??
+            [];
+      }
+
+      test('returns expected default values', () async {
+        final service = context.service;
+        final flagList = await service.getFlagList();
+        expect(
+          stringifyFlags(flagList),
+          containsAll([
+            'pause_isolates_on_start -> false',
+          ]),
+        );
+      });
+
+      test('returns any modified flag values', () async {
+        final service = context.service;
+        await service.setFlag('pause_isolates_on_start', 'true');
+        final flagList = await service.getFlagList();
+        expect(
+          stringifyFlags(flagList),
+          containsAll([
+            'pause_isolates_on_start -> true',
+          ]),
+        );
+      });
+    });
+
     group('streamListen/onEvent', () {
       late ChromeProxyService service;