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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:meta/meta.dart';
import 'package:pool/pool.dart';
import 'asset.dart' hide defaultManifestPath;
import 'base/common.dart';
import 'base/file_system.dart';
import 'base/logger.dart';
import 'build_info.dart';
import 'build_system/build_system.dart';
import 'build_system/depfile.dart';
import 'build_system/targets/common.dart';
import 'build_system/targets/shader_compiler.dart';
import 'bundle.dart';
import 'cache.dart';
import 'devfs.dart';
import 'globals.dart' as globals;
import 'project.dart';
/// Provides a `build` method that builds the bundle.
class BundleBuilder {
/// Builds the bundle for the given target platform.
///
/// The default `mainPath` is `lib/main.dart`.
/// The default `manifestPath` is `pubspec.yaml`
Future<void> build({
required TargetPlatform platform,
required BuildInfo buildInfo,
FlutterProject? project,
String? mainPath,
String manifestPath = defaultManifestPath,
String? applicationKernelFilePath,
String? depfilePath,
String? assetDirPath,
@visibleForTesting BuildSystem? buildSystem,
}) async {
project ??= FlutterProject.current();
mainPath ??= defaultMainPath;
depfilePath ??= defaultDepfilePath;
assetDirPath ??= getAssetBuildDirectory();
buildSystem ??= globals.buildSystem;
// If the precompiled flag was not passed, force us into debug mode.
final Environment environment = Environment(
projectDir: project.directory,
outputDir: globals.fs.directory(assetDirPath),
buildDir: project.dartTool.childDirectory('flutter_build'),
cacheDir: globals.cache.getRoot(),
flutterRootDir: globals.fs.directory(Cache.flutterRoot),
engineVersion: globals.artifacts!.isLocalEngine
? null
: globals.flutterVersion.engineRevision,
defines: <String, String>{
// used by the KernelSnapshot target
kTargetPlatform: getNameForTargetPlatform(platform),
kTargetFile: mainPath,
kDeferredComponents: 'false',
...buildInfo.toBuildSystemEnvironment(),
},
artifacts: globals.artifacts!,
fileSystem: globals.fs,
logger: globals.logger,
processManager: globals.processManager,
usage: globals.flutterUsage,
platform: globals.platform,
generateDartPluginRegistry: true,
);
final Target target = buildInfo.mode == BuildMode.debug
? const CopyFlutterBundle()
: const ReleaseCopyFlutterBundle();
final BuildResult result = await buildSystem.build(target, environment);
if (!result.success) {
for (final ExceptionMeasurement measurement in result.exceptions.values) {
globals.printError('Target ${measurement.target} failed: ${measurement.exception}',
stackTrace: measurement.fatal
? measurement.stackTrace
: null,
);
}
throwToolExit('Failed to build bundle.');
}
if (depfilePath != null) {
final Depfile depfile = Depfile(result.inputFiles, result.outputFiles);
final File outputDepfile = globals.fs.file(depfilePath);
if (!outputDepfile.parent.existsSync()) {
outputDepfile.parent.createSync(recursive: true);
}
final DepfileService depfileService = DepfileService(
fileSystem: globals.fs,
logger: globals.logger,
);
depfileService.writeToFile(depfile, outputDepfile);
}
// Work around for flutter_tester placing kernel artifacts in odd places.
if (applicationKernelFilePath != null) {
final File outputDill = globals.fs.directory(assetDirPath).childFile('kernel_blob.bin');
if (outputDill.existsSync()) {
outputDill.copySync(applicationKernelFilePath);
}
}
return;
}
}
Future<AssetBundle?> buildAssets({
required String manifestPath,
String? assetDirPath,
String? packagesPath,
TargetPlatform? targetPlatform,
}) async {
assetDirPath ??= getAssetBuildDirectory();
packagesPath ??= globals.fs.path.absolute('.packages');
// Build the asset bundle.
final AssetBundle assetBundle = AssetBundleFactory.instance.createBundle();
final int result = await assetBundle.build(
manifestPath: manifestPath,
packagesPath: packagesPath,
targetPlatform: targetPlatform,
);
if (result != 0) {
return null;
}
return assetBundle;
}
Future<void> writeBundle(
Directory bundleDir,
Map<String, DevFSContent> assetEntries,
Map<String, AssetKind> entryKinds,
{ Logger? loggerOverride }
) async {
loggerOverride ??= globals.logger;
if (bundleDir.existsSync()) {
try {
bundleDir.deleteSync(recursive: true);
} on FileSystemException catch (err) {
loggerOverride.printWarning(
'Failed to clean up asset directory ${bundleDir.path}: $err\n'
'To clean build artifacts, use the command "flutter clean".'
);
}
}
bundleDir.createSync(recursive: true);
final ShaderCompiler shaderCompiler = ShaderCompiler(
processManager: globals.processManager,
logger: globals.logger,
fileSystem: globals.fs,
artifacts: globals.artifacts!,
);
// Limit number of open files to avoid running out of file descriptors.
final Pool pool = Pool(64);
await Future.wait<void>(
assetEntries.entries.map<Future<void>>((MapEntry<String, DevFSContent> entry) async {
final PoolResource resource = await pool.request();
try {
// This will result in strange looking files, for example files with `/`
// on Windows or files that end up getting URI encoded such as `#.ext`
// to `%23.ext`. However, we have to keep it this way since the
// platform channels in the framework will URI encode these values,
// and the native APIs will look for files this way.
final File file = globals.fs.file(globals.fs.path.join(bundleDir.path, entry.key));
final AssetKind assetKind = entryKinds[entry.key] ?? AssetKind.regular;
file.parent.createSync(recursive: true);
final DevFSContent devFSContent = entry.value;
if (devFSContent is DevFSFileContent) {
final File input = devFSContent.file as File;
bool doCopy = true;
switch (assetKind) {
case AssetKind.regular:
break;
case AssetKind.font:
break;
case AssetKind.shader:
doCopy = !await shaderCompiler.compileShader(
input: input,
outputPath: file.path,
target: ShaderTarget.sksl, // TODO(zanderso): configure impeller target when enabled.
);
break;
}
if (doCopy) {
input.copySync(file.path);
}
} else {
await file.writeAsBytes(await entry.value.contentsAsBytes());
}
} finally {
resource.release();
}
}));
}