Migrate fuchsia_device to null safety (#95438)

packages/flutter_tools/lib/src/fuchsia/fuchsia_build.dart

@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
-import 'package:meta/meta.dart';
-
 import '../artifacts.dart';
 import '../asset.dart';
 import '../base/common.dart';
@@ -45,12 +41,13 @@ Future<void> _validateCmxFile(FuchsiaProject fuchsiaProject) async {
 // 3. Using these manifests, use the Fuchsia SDK 'pm' tool to create the
 //    Fuchsia package.
 Future<void> buildFuchsia({
-  @required FuchsiaProject fuchsiaProject,
-  @required TargetPlatform targetPlatform,
-  @required String target, // E.g., lib/main.dart
+  required FuchsiaProject fuchsiaProject,
+  required TargetPlatform targetPlatform,
+  String? target, // E.g., lib/main.dart
   BuildInfo buildInfo = BuildInfo.debug,
   String runnerPackageSource = FuchsiaPackageServer.toolHost,
 }) async {
+  final String targetPath = target ??= 'lib/main.dart';
   await _validateCmxFile(fuchsiaProject);
   final Directory outDir = globals.fs.directory(getFuchsiaBuildDirectory());
   if (!outDir.existsSync()) {
@@ -58,18 +55,18 @@ Future<void> buildFuchsia({
   }
 
   await _timedBuildStep('fuchsia-kernel-compile',
-    () => fuchsiaSdk.fuchsiaKernelCompiler.build(
-      fuchsiaProject: fuchsiaProject, target: target, buildInfo: buildInfo));
+    () => fuchsiaSdk!.fuchsiaKernelCompiler.build(
+      fuchsiaProject: fuchsiaProject, target: targetPath, buildInfo: buildInfo));
 
   if (buildInfo.usesAot) {
     await _timedBuildStep('fuchsia-gen-snapshot',
-      () => _genSnapshot(fuchsiaProject, target, buildInfo, targetPlatform));
+      () => _genSnapshot(fuchsiaProject, targetPath, buildInfo, targetPlatform));
   }
 
   await _timedBuildStep('fuchsia-build-assets',
-    () => _buildAssets(fuchsiaProject, target, buildInfo));
+    () => _buildAssets(fuchsiaProject, targetPath, buildInfo));
   await _timedBuildStep('fuchsia-build-package',
-    () => _buildPackage(fuchsiaProject, target, buildInfo, runnerPackageSource));
+    () => _buildPackage(fuchsiaProject, targetPath, buildInfo, runnerPackageSource));
 }
 
 Future<void> _genSnapshot(
@@ -84,7 +81,7 @@ Future<void> _genSnapshot(
 
   final String elf = globals.fs.path.join(outDir, 'elf.aotsnapshot');
 
-  final String genSnapshot = globals.artifacts.getArtifactPath(
+  final String genSnapshot = globals.artifacts!.getArtifactPath(
     Artifact.genSnapshot,
     platform: targetPlatform,
     mode: buildInfo.mode,
@@ -118,7 +115,7 @@ Future<void> _buildAssets(
   BuildInfo buildInfo,
 ) async {
   final String assetDir = getAssetBuildDirectory();
-  final AssetBundle assets = await buildAssets(
+  final AssetBundle? assets = await buildAssets(
     manifestPath: fuchsiaProject.project.pubspecFile.path,
     packagesPath: fuchsiaProject.project.packagesFile.path,
     assetDirPath: assetDir,
@@ -148,7 +145,7 @@ Future<void> _buildAssets(
 }
 
 void _rewriteCmx(BuildMode mode, String runnerPackageSource, File src, File dst) {
-  final Map<String, dynamic> cmx = castStringKeyedMap(json.decode(src.readAsStringSync()));
+  final Map<String, Object?> cmx = castStringKeyedMap(json.decode(src.readAsStringSync())) ?? <String, Object?>{};
   // If the app author has already specified the runner in the cmx file, then
   // do not override it with something else.
   if (cmx.containsKey('runner')) {
@@ -171,7 +168,6 @@ void _rewriteCmx(BuildMode mode, String runnerPackageSource, File src, File dst)
       break;
     default:
       throwToolExit('Fuchsia does not support build mode "$mode"');
-      break;
   }
   cmx['runner'] = 'fuchsia-pkg://$runnerPackageSource/$runner#meta/$runner.cmx';
   dst.writeAsStringSync(json.encode(cmx));
@@ -218,7 +214,10 @@ Future<void> _buildPackage(
   manifestFile.writeAsStringSync('meta/package=$pkgDir/meta/package\n',
       mode: FileMode.append);
 
-  final FuchsiaPM fuchsiaPM = fuchsiaSdk.fuchsiaPM;
+  final FuchsiaPM? fuchsiaPM = fuchsiaSdk?.fuchsiaPM;
+  if (fuchsiaPM == null) {
+    return;
+  }
   if (!await fuchsiaPM.init(pkgDir, appName)) {
     return;
   }

packages/flutter_tools/lib/src/fuchsia/pkgctl.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import '../base/process.dart';
 
 import 'fuchsia_device.dart';

packages/flutter_tools/lib/src/fuchsia/session_control.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import '../base/process.dart';
 
 import 'fuchsia_device.dart';

packages/flutter_tools/lib/src/fuchsia/tiles_ctl.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// @dart = 2.8
-
 import '../base/process.dart';
 import '../globals.dart' as globals;
 
@@ -23,7 +21,7 @@ class FuchsiaTilesCtl {
   /// found.
   static Future<int> findAppKey(FuchsiaDevice device, String appName) async {
     final FuchsiaTilesCtl tilesCtl = fuchsiaDeviceTools.tilesCtl;
-    final Map<int, String> runningApps = await tilesCtl.list(device);
+    final Map<int, String>? runningApps = await tilesCtl.list(device);
     if (runningApps == null) {
       globals.printTrace('tiles_ctl is not running');
       return -1;
@@ -39,7 +37,7 @@ class FuchsiaTilesCtl {
   /// Ensures that tiles is running on the device.
   static Future<bool> ensureStarted(FuchsiaDevice device) async {
     final FuchsiaTilesCtl tilesCtl = fuchsiaDeviceTools.tilesCtl;
-    final Map<int, String> runningApps = await tilesCtl.list(device);
+    final Map<int, String>? runningApps = await tilesCtl.list(device);
     if (runningApps == null) {
       return tilesCtl.start(device);
     }
@@ -58,7 +56,7 @@ class FuchsiaTilesCtl {
   ///
   /// Returns an empty mapping if tiles_ctl is running but no apps are running.
   /// Returns null if tiles_ctl is not running.
-  Future<Map<int, String>> list(FuchsiaDevice device) async {
+  Future<Map<int, String>?> list(FuchsiaDevice device) async {
     // Output of tiles_ctl list has the format:
     // Found 1 tiles:
     // Tile key 1 url fuchsia-pkg://fuchsia.com/stocks#meta/stocks.cmx ...
@@ -75,11 +73,13 @@ class FuchsiaTilesCtl {
     for (final String line in result.stdout.split('\n')) {
       final List<String> words = line.split(' ');
       if (words.isNotEmpty && words[0] == 'Tile') {
-        final int key = int.tryParse(words[2]);
+        final int? key = int.tryParse(words[2]);
+        if (key != null) {
           final String url = words[4];
           tiles[key] = url;
         }
       }
+    }
     return tiles;
   }
 

packages/flutter_tools/test/general.shard/fuchsia/fuchsia_device_test.dart

@@ -91,7 +91,7 @@ void main() {
       final FakeFuchsiaWorkflow fuchsiaWorkflow = FakeFuchsiaWorkflow(canListDevices: false);
       final FuchsiaDevices fuchsiaDevices = FuchsiaDevices(
         platform: FakePlatform(),
-        fuchsiaSdk: null,
+        fuchsiaSdk: FakeFuchsiaSdk(devices: 'ignored'),
         fuchsiaWorkflow: fuchsiaWorkflow,
         logger: BufferLogger.test(),
       );
@@ -154,7 +154,7 @@ void main() {
 
     testUsingContext('disposing device disposes the portForwarder', () async {
       final FakePortForwarder portForwarder = FakePortForwarder();
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
       device.portForwarder = portForwarder;
       await device.dispose();
 
@@ -162,7 +162,7 @@ void main() {
     });
 
     testWithoutContext('default capabilities', () async {
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
       final FlutterProject project = FlutterProject.fromDirectoryTest(memoryFileSystem.currentDirectory);
       memoryFileSystem.directory('fuchsia').createSync(recursive: true);
       memoryFileSystem.file('pubspec.yaml').createSync();
@@ -174,13 +174,13 @@ void main() {
     });
 
     test('is ephemeral', () {
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
 
       expect(device.ephemeral, true);
     });
 
     testWithoutContext('supported for project', () async {
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
       final FlutterProject project = FlutterProject.fromDirectoryTest(memoryFileSystem.currentDirectory);
       memoryFileSystem.directory('fuchsia').createSync(recursive: true);
       memoryFileSystem.file('pubspec.yaml').createSync();
@@ -189,7 +189,7 @@ void main() {
     });
 
     testWithoutContext('not supported for project', () async {
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
       final FlutterProject project = FlutterProject.fromDirectoryTest(memoryFileSystem.currentDirectory);
       memoryFileSystem.file('pubspec.yaml').createSync();
 
@@ -197,7 +197,7 @@ void main() {
     });
 
     testUsingContext('targetPlatform does not throw when sshConfig is missing', () async {
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
 
       expect(await device.targetPlatform, TargetPlatform.fuchsia_arm64);
     }, overrides: <Type, Generator>{
@@ -212,7 +212,7 @@ void main() {
         stdout: 'aarch64',
       ));
 
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
       expect(await device.targetPlatform, TargetPlatform.fuchsia_arm64);
     }, overrides: <Type, Generator>{
       FuchsiaArtifacts: () => FuchsiaArtifacts(sshConfig: sshConfig),
@@ -226,7 +226,7 @@ void main() {
         stdout: 'x86_64',
       ));
 
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
       expect(await device.targetPlatform, TargetPlatform.fuchsia_x64);
     }, overrides: <Type, Generator>{
       FuchsiaArtifacts: () => FuchsiaArtifacts(sshConfig: sshConfig),
@@ -240,7 +240,7 @@ void main() {
         stdout: 'fe80::8c6c:2fff:fe3d:c5e1%ethp0003 50666 fe80::5054:ff:fe63:5e7a%ethp0003 22',
       ));
 
-      final FuchsiaDevice device = FuchsiaDevice('id');
+      final FuchsiaDevice device = FuchsiaDevice('id', name: 'device');
       expect(await device.hostAddress, 'fe80::8c6c:2fff:fe3d:c5e1%25ethp0003');
     }, overrides: <Type, Generator>{
       FuchsiaArtifacts: () => FuchsiaArtifacts(sshConfig: sshConfig),
@@ -254,7 +254,7 @@ void main() {
         exitCode: 1,
       ));
 
-      final FuchsiaDevice device = FuchsiaDevice('id');
+      final FuchsiaDevice device = FuchsiaDevice('id', name: 'device');
       await expectLater(() => device.hostAddress, throwsToolExit());
     }, overrides: <Type, Generator>{
       FuchsiaArtifacts: () => FuchsiaArtifacts(sshConfig: sshConfig),
@@ -267,7 +267,7 @@ void main() {
         command: <String>['ssh', '-F', '/ssh_config', 'id', r'echo $SSH_CONNECTION'],
       ));
 
-      final FuchsiaDevice device = FuchsiaDevice('id');
+      final FuchsiaDevice device = FuchsiaDevice('id', name: 'device');
       expect(() async => device.hostAddress, throwsToolExit());
     }, overrides: <Type, Generator>{
       FuchsiaArtifacts: () => FuchsiaArtifacts(sshConfig: sshConfig),
@@ -289,7 +289,7 @@ void main() {
       processManager.addCommand(const FakeCommand(
         command: <String>['ssh', '-F', '/artifact', 'id', 'find /hub -name vmservice-port'],
       ));
-      final FuchsiaDevice device = FuchsiaDevice('id');
+      final FuchsiaDevice device = FuchsiaDevice('id', name: 'device');
 
       await expectLater(device.servicePorts, throwsToolExit(message: 'No Dart Observatories found. Are you running a debug build?'));
     }, overrides: <Type, Generator>{
@@ -766,7 +766,7 @@ void main() {
     });
 
     testUsingContext('does not throw on non-existent ssh config', () async {
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
 
       expect(await device.sdkNameAndVersion, equals('Fuchsia'));
     }, overrides: <Type, Generator>{
@@ -780,7 +780,7 @@ void main() {
         command: <String>['ssh', '-F', '/ssh_config', '123', 'cat /pkgfs/packages/build-info/0/data/version'],
         stdout: 'version'
       ));
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
 
       expect(await device.sdkNameAndVersion, equals('Fuchsia version'));
     }, overrides: <Type, Generator>{
@@ -794,7 +794,7 @@ void main() {
         command: <String>['ssh', '-F', '/ssh_config', '123', 'cat /pkgfs/packages/build-info/0/data/version'],
         exitCode: 1,
       ));
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
 
       expect(await device.sdkNameAndVersion, equals('Fuchsia'));
     }, overrides: <Type, Generator>{
@@ -807,7 +807,7 @@ void main() {
       processManager.addCommand(const FakeCommand(
         command: <String>['ssh', '-F', '/ssh_config', '123', 'cat /pkgfs/packages/build-info/0/data/version'],
       ));
-      final FuchsiaDevice device = FuchsiaDevice('123');
+      final FuchsiaDevice device = FuchsiaDevice('123', name: 'device');
 
       expect(await device.sdkNameAndVersion, equals('Fuchsia'));
     }, overrides: <Type, Generator>{