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https://github.com/flutter/flutter
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Add API to read flavor from framework at run time (#134179)
Resolves #128046.
Adds a services API that allows flutter app developers to write app code that determines `--flavor` the app was built with.
This is implemented by having the tool adding the value of `--flavor` to its list of dart environment declarations, which will be available to the app at run time. Specifically,`FLUTTER_APP_FLAVOR` is set. I chose this implementation for its simplicity. There is some precedent for this, but only for web ([example](cd2f3f5e78/packages/flutter_tools/lib/src/runner/flutter_command.dart (L1231)
)).
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parent
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@ -3,6 +3,7 @@
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// found in the LICENSE file.
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import 'package:flavors/main.dart' as app;
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import 'package:flutter/services.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:integration_test/integration_test.dart';
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@ -16,6 +17,7 @@ void main() {
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await tester.pumpAndSettle();
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expect(find.text('paid'), findsOneWidget);
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expect(appFlavor, 'paid');
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});
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});
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}
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@ -19,6 +19,7 @@ export 'src/services/browser_context_menu.dart';
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export 'src/services/clipboard.dart';
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export 'src/services/debug.dart';
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export 'src/services/deferred_component.dart';
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export 'src/services/flavor.dart';
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export 'src/services/font_loader.dart';
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export 'src/services/haptic_feedback.dart';
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export 'src/services/hardware_keyboard.dart';
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10
packages/flutter/lib/src/services/flavor.dart
Normal file
10
packages/flutter/lib/src/services/flavor.dart
Normal file
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@ -0,0 +1,10 @@
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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/// The flavor this app was built with.
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///
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/// This is equivalent to the value argued to the `--flavor` option at build time.
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/// This will be `null` if the `--flavor` option was not provided.
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const String? appFlavor = String.fromEnvironment('FLUTTER_APP_FLAVOR') != '' ?
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String.fromEnvironment('FLUTTER_APP_FLAVOR') : null;
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@ -1247,10 +1247,20 @@ abstract class FlutterCommand extends Command<void> {
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}
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}
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final String? flavor = argParser.options.containsKey('flavor') ? stringArg('flavor') : null;
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if (flavor != null) {
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if (globals.platform.environment['FLUTTER_APP_FLAVOR'] != null) {
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throwToolExit('FLUTTER_APP_FLAVOR is used by the framework and cannot be set in the environment.');
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}
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if (dartDefines.any((String define) => define.startsWith('FLUTTER_APP_FLAVOR'))) {
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throwToolExit('FLUTTER_APP_FLAVOR is used by the framework and cannot be '
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'set using --${FlutterOptions.kDartDefinesOption} or --${FlutterOptions.kDartDefineFromFileOption}');
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}
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dartDefines.add('FLUTTER_APP_FLAVOR=$flavor');
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}
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return BuildInfo(buildMode,
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argParser.options.containsKey('flavor')
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? stringArg('flavor')
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: null,
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flavor,
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trackWidgetCreation: trackWidgetCreation,
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frontendServerStarterPath: argParser.options
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.containsKey(FlutterOptions.kFrontendServerStarterPath)
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@ -11,11 +11,14 @@ import 'package:flutter_tools/src/base/common.dart';
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import 'package:flutter_tools/src/base/error_handling_io.dart';
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import 'package:flutter_tools/src/base/file_system.dart';
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import 'package:flutter_tools/src/base/io.dart';
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import 'package:flutter_tools/src/base/logger.dart';
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import 'package:flutter_tools/src/base/platform.dart';
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import 'package:flutter_tools/src/base/signals.dart';
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import 'package:flutter_tools/src/base/time.dart';
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import 'package:flutter_tools/src/base/user_messages.dart';
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import 'package:flutter_tools/src/build_info.dart';
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import 'package:flutter_tools/src/cache.dart';
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import 'package:flutter_tools/src/commands/run.dart';
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import 'package:flutter_tools/src/dart/pub.dart';
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import 'package:flutter_tools/src/device.dart';
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import 'package:flutter_tools/src/globals.dart' as globals;
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@ -700,6 +703,67 @@ void main() {
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expect(testLogger.statusText, contains(UserMessages().flutterSpecifyDevice));
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});
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});
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group('--flavor', () {
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late _TestDeviceManager testDeviceManager;
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late Logger logger;
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late FileSystem fileSystem;
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setUp(() {
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logger = BufferLogger.test();
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testDeviceManager = _TestDeviceManager(logger: logger);
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fileSystem = MemoryFileSystem.test();
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});
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testUsingContext("tool exits when FLUTTER_APP_FLAVOR is already set in user's environment", () async {
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fileSystem.file('lib/main.dart').createSync(recursive: true);
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fileSystem.file('pubspec.yaml').createSync();
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fileSystem.file('.packages').createSync();
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final FakeDevice device = FakeDevice('name', 'id');
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testDeviceManager.devices = <Device>[device];
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final _TestRunCommandThatOnlyValidates command = _TestRunCommandThatOnlyValidates();
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final CommandRunner<void> runner = createTestCommandRunner(command);
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expect(runner.run(<String>['run', '--no-pub', '--no-hot', '--flavor=strawberry']),
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throwsToolExit(message: 'FLUTTER_APP_FLAVOR is used by the framework and cannot be set in the environment.'));
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}, overrides: <Type, Generator>{
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DeviceManager: () => testDeviceManager,
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Platform: () => FakePlatform(
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environment: <String, String>{
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'FLUTTER_APP_FLAVOR': 'I was already set'
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}
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),
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Cache: () => Cache.test(processManager: FakeProcessManager.any()),
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FileSystem: () => fileSystem,
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ProcessManager: () => FakeProcessManager.any(),
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});
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testUsingContext('tool exits when FLUTTER_APP_FLAVOR is set in --dart-define or --dart-define-from-file', () async {
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fileSystem.file('lib/main.dart').createSync(recursive: true);
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fileSystem.file('pubspec.yaml').createSync();
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fileSystem.file('.packages').createSync();
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fileSystem.file('config.json')..createSync()..writeAsStringSync('{"FLUTTER_APP_FLAVOR": "strawberry"}');
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final FakeDevice device = FakeDevice('name', 'id');
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testDeviceManager.devices = <Device>[device];
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final _TestRunCommandThatOnlyValidates command = _TestRunCommandThatOnlyValidates();
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final CommandRunner<void> runner = createTestCommandRunner(command);
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expect(runner.run(<String>['run', '--dart-define=FLUTTER_APP_FLAVOR=strawberry', '--no-pub', '--no-hot', '--flavor=strawberry']),
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throwsToolExit(message: 'FLUTTER_APP_FLAVOR is used by the framework and cannot be set using --dart-define or --dart-define-from-file'));
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expect(runner.run(<String>['run', '--dart-define-from-file=config.json', '--no-pub', '--no-hot', '--flavor=strawberry']),
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throwsToolExit(message: 'FLUTTER_APP_FLAVOR is used by the framework and cannot be set using --dart-define or --dart-define-from-file'));
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}, overrides: <Type, Generator>{
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DeviceManager: () => testDeviceManager,
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Platform: () => FakePlatform(),
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Cache: () => Cache.test(processManager: FakeProcessManager.any()),
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FileSystem: () => fileSystem,
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ProcessManager: () => FakeProcessManager.any(),
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});
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});
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});
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}
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@ -853,3 +917,22 @@ class FakePub extends Fake implements Pub {
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PubOutputMode outputMode = PubOutputMode.all,
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}) async { }
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}
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class _TestDeviceManager extends DeviceManager {
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_TestDeviceManager({required super.logger});
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List<Device> devices = <Device>[];
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@override
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List<DeviceDiscovery> get deviceDiscoverers {
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final FakePollingDeviceDiscovery discoverer = FakePollingDeviceDiscovery();
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devices.forEach(discoverer.addDevice);
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return <DeviceDiscovery>[discoverer];
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}
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}
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class _TestRunCommandThatOnlyValidates extends RunCommand {
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@override
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Future<FlutterCommandResult> runCommand() async {
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return FlutterCommandResult.success();
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}
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}
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