aspect_frontend_server

编译frontend_server.dart.snapshot,让其具有aop的功能

懒人做法,一步到位

下载frontend_server.dart.snapshot并覆盖 ~/fvm/versions/3.24.3/bin/cache/dart-sdk/bin/snapshots/frontend_server.dart.snapshot

编译之前

1. 下载最新的dart-sdk,具体下载方法可以查看 https://github.com/dart-lang/sdk/wiki/Building

这里建议用depot_tools的方式下载,因为直接下载github上的sdk,third_party目录下面不会有你需要的包

2. 将dart-sdk切换到flutter对应的版本,一般情况下flutter对应的dart版本是可以通用的,但是如果flutter有大版本升级,需要切换到对应的版本.
3. 我是通过 fvm 管理 flutter 版本，如果你不是则需要注意下面命令的路径

编译方式

dart compile aot-snapshot --output=frontend_server_aot_macos.dart.snapshot --target-os macos bin/starter.dart dart compile aot-snapshot --output=frontend_server_aot_windows.dart.snapshot --target-os windows bin/starter.dart dart compile aot-snapshot --output=frontend_server_aot_linux.dart.snapshot --target-os linux bin/starter.dart

dart compile kernel --output=dump_kernel.dart.snapshot bin/dump_kernel.dart

测试编译

1. 生成kernel_snapshot.d,先用普通方法run一下example,在example/.dart_tool/flutter_build下面会有生成编译临时的文件

2. 执行下面命令测试(注意目录替换):

编译aot dill

.fvm/flutter_sdk/bin/cache/dart-sdk/bin/dartaotruntime frontend_server_aot.dart_macos.snapshot --sdk-root ~/fvm/versions/3.24.3/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --target=flutter --aot --tfa --no-print-incremental-dependencies -Dflutter.inspector.structuredErrors=true -DFLUTTER_WEB_AUTO_DETECT=true -Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --packages example/.dart_tool/package_config.json --output-dill app.aot --depfile example/.dart_tool/flutter_build/31a7f421330fdca23d68f3c09767c0a5/kernel_snapshot.d package:example/main.dart

注意：31a7f421330fdca23d68f3c09767c0a5 这个需要修改成你目录下面的缓存路径

编译运行时dill

.fvm/flutter_sdk/bin/cache/dart-sdk/bin/dartaotruntime frontend_server_aot.dart_macos.snapshot --sdk-root ~/fvm/versions/3.24.3/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --target=flutter --no-print-incremental-dependencies -Dflutter.inspector.structuredErrors=true -DFLUTTER_WEB_AUTO_DETECT=true -Ddart.vm.profile=false -Ddart.vm.product=false --enable-asserts --track-widget-creation --packages example/.dart_tool/package_config.json --output-dill app.dill --depfile example/.dart_tool/flutter_build/31a7f421330fdca23d68f3c09767c0a5/kernel_snapshot.d package:example/main.dart

注意：31a7f421330fdca23d68f3c09767c0a5 这个需要修改成你目录下面的缓存路径

.fvm/flutter_sdk/bin/cache/dart-sdk/bin/dartaotruntime frontend_server_aot.dart_macos.snapshot --sdk-root /Users/lixin/fvm/versions/3.24.3/bin/cache/artifacts/engine/common/flutter_patched_sdk/ --target=flutter --no-print-incremental-dependencies -Ddart.vm.profile=true -Ddart.vm.product=false --delete-tostring-package-uri=dart:ui --delete-tostring-package-uri=package:flutter --track-widget-creation --aot --tfa --target-os macos --packages /Users/lixin/Documents/FlutterWorkspace/aspect_frontend_server/example/.dart_tool/package_config.json --output-dill program.dill --depfile /Users/lixin/Documents/FlutterWorkspace/aspect_frontend_server/example/.dart_tool/flutter_build/6b9ed135a83e69e25931946e49bdcd50/kernel_snapshot_program.d --verbosity=error package:example/main.dart

测试aot编译成二进制

~/fvm/versions/3.24.3/bin/cache/artifacts/engine/android-arm64-release/darwin-x64/gen_snapshot --deterministic --snapshot_kind=app-aot-elf --elf=app.so --strip app.dill

dill 文件注入成功检测

dart run dump_kernel.dart.snapshot app.dill injected.out.dill.txt

dart run dump_kernel.dart.snapshot /Users/yourname/Documents/FlutterWorkspace/aspect_frontend_server/example/.dart_tool/flutter_build/31a7f421330fdca23d68f3c09767c0a5/app.dill injected.out.dill.txt

测试生成汇编上下文

.fvm/versions/3.24.3/bin/cache/artifacts/engine/darwin-x64-release/gen_snapshot_x64 --deterministic --snapshot_kind=app-aot-assembly --assembly=/Users/yourname/Documents/FlutterWorkspace/aspect_frontend_server/snapshot_assembly.S /Users/yourname/Documents/FlutterWorkspace/aspect_frontend_server/app.dill

替换flutter中的frontend_server.dart.snapshot

1.将新编译的frontend_server_aot.dart.snapshot覆盖 ~/fvm/versions/3.24.3/bin/cache/dart-sdk/bin/snapshots

2.注意替换系统对应的版本，如果是 macos 则是 frontend_server_aot_macos.dart.snapshot，因为我是 mac 系统，其他系统版本没测试过。

测试运行

cd example && flutter clean && flutter pub get && flutter run

该方法和aspectd的区别

1. aspectd不支持flutter 2.5.4以上,本项目最高支持到2.23.3,再高没有测过
2. aspectd使用前需要对flutter tools的代码进行修改,本项目只需要替换flutter sdk对应的frontend_server.dart.snapshot即可
3. aspectd的实现原理过于复杂,本项目去掉了Call,Inject等用法保留了Execute用法的同时对注入逻辑进行了简化
4. aspectd还需要aspect_impl等,本项目可以直接在主程序代码中添加注入代码,也可以用plugin的方式添加
5. 本项目不需要引入任何第三方包,用pragma注解完成对应插桩
6. 完全支持hot restart,免去了冷重启的烦恼
7. 为了性能优化inject方法限制必须是static的