select ResidentCompiler during FlutterDevice initialization (flutter#…

…28603)

.gitignore

@@ -32,6 +32,9 @@
 /packages/flutter/coverage/
 version
 
+# packages file containing multi-root paths
+.packages.generated
+
 # Flutter/Dart/Pub related
 **/doc/api/
 .dart_tool/

dev/integration_tests/codegen/lib/main.dart

@@ -17,7 +17,7 @@ class ExampleWidget extends StatefulWidget {
 }
 
 class _ExampleWidgetState extends State<ExampleWidget> {
-  String _message = '';
+  bool _pressed = false;
 
   @override
   Widget build(BuildContext context) {
@@ -30,14 +30,21 @@ class _ExampleWidgetState extends State<ExampleWidget> {
               child: const Text('Press Button, Get Coffee'),
               onPressed: () async {
                 setState(() {
-                 _message = generated.message;
+                 _pressed = true;
                 });
               },
             ),
-            Text(_message),
+            _pressed ? GeneratedWidget() : const SizedBox(),
           ],
         ),
       ),
     );
   }
 }
+
+class GeneratedWidget extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Text(generated.message);
+  }
+}

dev/integration_tests/codegen/lib/message.spec

@@ -1 +1 @@
-final String message = 'Thanks for using PourOverSupremeFiesta by Coffee by Flutter Inc.';
+String get message => 'Thanks for using PourOverSupremeFiesta by Coffee by Flutter Inc.';

dev/integration_tests/codegen/test/example_test.dart

@@ -0,0 +1,11 @@
+import 'package:codegen/main.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('can reference generated code', (WidgetTester tester) async {
+    await tester.pumpWidget(MaterialApp(home: GeneratedWidget()));
+
+    expect(find.text('Thanks for using PourOverSupremeFiesta by Coffee by Flutter Inc.'), findsOneWidget);
+  });
+}

dev/integration_tests/codegen/test_driver/main_test.dart

@@ -24,4 +24,4 @@ void main() {
       final String fullMessage = await driver.getText(find.text(message));
       expect(fullMessage, message);
     });
-}
+}

packages/flutter_build/lib/src/kernel_builder.dart

@@ -89,25 +89,18 @@ class FlutterKernelBuilder implements Builder {
       return;
     }
     final AssetId outputId = buildStep.inputId.changeExtension(_kFlutterDillOutputExtension);
-    final AssetId packagesOutputId = buildStep.inputId.changeExtension(_kPackagesExtension);
 
     // Create a scratch space file that can be read/written by the frontend server.
     // It is okay to hard-code these file names because we will copy them back
     // from the temp directory at the end of the build step.
     final Directory tempDirecory = await Directory.systemTemp.createTemp('_flutter_build');
-    final File packagesFile = File(path.join(tempDirecory.path, _kPackagesExtension));
+    final Directory projectDir = File(packagesPath).parent;
+    final String packagesFilePath = path.join(projectDir.path, '.packages.generated');
     final File outputFile =  File(path.join(tempDirecory.path, 'main.app.dill'));
     await outputFile.create();
-    await packagesFile.create();
 
-    final Directory projectDir = File(packagesPath).parent;
     final String packageName = buildStep.inputId.package;
-    final String oldPackagesContents = await File(packagesPath).readAsString();
-    // Note: currently we only replace the root package with a multiroot
-    // scheme. To support codegen on arbitrary packages we will need to do
-    // this for each dependency.
-    final String newPackagesContents = oldPackagesContents.replaceFirst('$packageName:lib/', '$packageName:$_kMultirootScheme:/');
-    await packagesFile.writeAsString(newPackagesContents);
+
     String absoluteMainPath;
     if (path.isAbsolute(mainPath)) {
       absoluteMainPath = mainPath;
@@ -143,7 +136,7 @@ class FlutterKernelBuilder implements Builder {
     final String normalRoot =  path.join(projectDir.absolute.path, 'lib${Platform.pathSeparator}');
     arguments.addAll(<String>[
       '--packages',
-      Uri.file(packagesFile.path).toString(),
+      packagesFilePath,
       '--output-dill',
       outputFile.path,
       '--filesystem-root',
@@ -158,7 +151,7 @@ class FlutterKernelBuilder implements Builder {
     }
     final Uri mainUri = _PackageUriMapper.findUri(
       absoluteMainPath,
-      packagesFile.path,
+      packagesFilePath,
       _kMultirootScheme,
       <String>[normalRoot, generatedRoot],
     );
@@ -178,7 +171,6 @@ class FlutterKernelBuilder implements Builder {
       await server.exitCode;
       await _stdoutHandler.compilerOutput.future;
       await buildStep.writeAsBytes(outputId, await outputFile.readAsBytes());
-      await buildStep.writeAsBytes(packagesOutputId, await packagesFile.readAsBytes());
     } catch (err, stackTrace) {
       log.shout('frontend server failed to start: $err, $stackTrace');
     }

packages/flutter_tools/lib/src/build_runner/build_runner.dart

@@ -22,12 +22,18 @@ import '../base/logger.dart';
 import '../base/process_manager.dart';
 import '../codegen.dart';
 import '../convert.dart';
+import '../dart/package_map.dart';
 import '../dart/pub.dart';
 import '../globals.dart';
 import '../project.dart';
 import '../resident_runner.dart';
 import 'build_script_generator.dart';
 
+// Arbitrarily choosen multi-root file scheme. This is used to configure the
+// frontend_server to resolve a package uri to multiple filesystem directories.
+// In this case, the source directory and a generated directory.
+const String _kMultirootScheme = 'org-dartlang-app';
+
 /// A wrapper for a build_runner process which delegates to a generated
 /// build script.
 ///
@@ -37,7 +43,7 @@ class BuildRunner extends CodeGenerator {
   const BuildRunner();
 
   @override
-  Future<CodeGenerationResult> build({
+  Future<CodeGenerationResult> build(FlutterProject flutterProject, {
     @required String mainPath,
     @required bool aot,
     @required bool linkPlatformKernelIn,
@@ -46,8 +52,7 @@ class BuildRunner extends CodeGenerator {
     List<String> extraFrontEndOptions = const <String>[],
     bool disableKernelGeneration = false,
   }) async {
-    await generateBuildScript();
-    final FlutterProject flutterProject = await FlutterProject.current();
+    await generateBuildScript(flutterProject);
     final String frontendServerPath = artifacts.getArtifactPath(
       Artifact.frontendServerSnapshotForEngineDartSdk
     );
@@ -99,7 +104,7 @@ class BuildRunner extends CodeGenerator {
       status.stop();
     }
     if (disableKernelGeneration) {
-      return const CodeGenerationResult(null, null);
+      return const CodeGenerationResult(null);
     }
     /// We don't check for this above because it might be generated for the
     /// first time by invoking the build.
@@ -114,21 +119,17 @@ class BuildRunner extends CodeGenerator {
       throw Exception('build_runner cannot find generated directory');
     }
     final String relativeMain = fs.path.relative(mainPath, from: flutterProject.directory.path);
-    final File packagesFile = fs.file(
-      fs.path.join(generatedDirectory.path,  fs.path.setExtension(relativeMain, '.packages'))
-    );
     final File dillFile = fs.file(
       fs.path.join(generatedDirectory.path, fs.path.setExtension(relativeMain, '.app.dill'))
     );
-    if (!packagesFile.existsSync() || !dillFile.existsSync()) {
+    if (!dillFile.existsSync()) {
       throw Exception('build_runner did not produce output at expected location: ${dillFile.path} missing');
     }
-    return CodeGenerationResult(packagesFile, dillFile);
+    return CodeGenerationResult(dillFile);
   }
 
   @override
-  Future<void> generateBuildScript() async {
-    final FlutterProject flutterProject = await FlutterProject.current();
+  Future<void> generateBuildScript(FlutterProject flutterProject) async {
     final Directory entrypointDirectory = fs.directory(fs.path.join(flutterProject.dartTool.path, 'build', 'entrypoint'));
     final Directory generatedDirectory = fs.directory(fs.path.join(flutterProject.dartTool.path, 'flutter_tool'));
     final File buildScript = entrypointDirectory.childFile('build.dart');
@@ -180,7 +181,6 @@ class BuildRunner extends CodeGenerator {
       stringBuffer.writeln('  flutter_build:');
       stringBuffer.writeln('    sdk: flutter');
       syntheticPubspec.writeAsStringSync(stringBuffer.toString());
-
       await pubGet(
         context: PubContext.pubGet,
         directory: generatedDirectory.path,
@@ -210,16 +210,16 @@ class BuildRunner extends CodeGenerator {
   }
 
   @override
-  Future<CodegenDaemon> daemon({
+  Future<CodegenDaemon> daemon(FlutterProject flutterProject, {
     String mainPath,
     bool linkPlatformKernelIn = false,
     bool targetProductVm = false,
     bool trackWidgetCreation = false,
     List<String> extraFrontEndOptions = const <String> [],
   }) async {
     mainPath ??= findMainDartFile();
-    await generateBuildScript();
-    final FlutterProject flutterProject = await FlutterProject.current();
+    await generateBuildScript(flutterProject);
+    _generatePackages(flutterProject);
     final String frontendServerPath = artifacts.getArtifactPath(
       Artifact.frontendServerSnapshotForEngineDartSdk
     );
@@ -265,19 +265,28 @@ class BuildRunner extends CodeGenerator {
       builder.target = flutterProject.manifest.appName;
     }));
     final String relativeMain = fs.path.relative(mainPath, from: flutterProject.directory.path);
-    final File generatedPackagesFile = fs.file(fs.path.join(flutterProject.generated.path, fs.path.setExtension(relativeMain, '.packages')));
     final File generatedDillFile = fs.file(fs.path.join(flutterProject.generated.path, fs.path.setExtension(relativeMain, '.app.dill')));
-    return _BuildRunnerCodegenDaemon(buildDaemonClient, generatedPackagesFile, generatedDillFile);
+    return _BuildRunnerCodegenDaemon(buildDaemonClient, generatedDillFile);
+  }
+
+  // Create generated packages file which adds a multi-root scheme to the user's
+  // project directory. Currently we only replace the root package with a multiroot
+  // scheme. To support codegen on arbitrary packages we would need to do
+  // this for each dependency.
+  void _generatePackages(FlutterProject flutterProject) {
+    final String oldPackagesContents = fs.file(PackageMap.globalPackagesPath).readAsStringSync();
+    final String appName = flutterProject.manifest.appName;
+    final String newPackagesContents = oldPackagesContents.replaceFirst('$appName:lib/', '$appName:$_kMultirootScheme:/');
+    final String generatedPackagesPath = fs.path.setExtension(PackageMap.globalPackagesPath, '.generated');
+    fs.file(generatedPackagesPath).writeAsStringSync(newPackagesContents);
   }
 }
 
 class _BuildRunnerCodegenDaemon implements CodegenDaemon {
-  _BuildRunnerCodegenDaemon(this.buildDaemonClient, this.packagesFile, this.dillFile);
+  _BuildRunnerCodegenDaemon(this.buildDaemonClient, this.dillFile);
 
   final BuildDaemonClient buildDaemonClient;
   @override
-  final File packagesFile;
-  @override
   final File dillFile;
   @override
   CodegenStatus get lastStatus => _lastStatus;