| // Copyright 2020 The Dart 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 'dart:async'; |
| import 'dart:convert'; |
| import 'dart:io'; |
| |
| import 'package:frontend_server_client/frontend_server_client.dart'; |
| import 'package:path/path.dart' as p; |
| import 'package:vm_service/vm_service.dart'; |
| import 'package:vm_service/vm_service_io.dart'; |
| |
| void main(List<String> args) async { |
| watch.start(); |
| if (args.isNotEmpty) { |
| throw ArgumentError('No command line args are supported'); |
| } |
| |
| var client = await FrontendServerClient.start('org-dartlang-root:///$app', |
| outputDill, p.join(sdkDir, 'lib', '_internal', 'vm_platform_strong.dill'), |
| target: 'vm', |
| fileSystemRoots: [p.current], |
| fileSystemScheme: 'org-dartlang-root', |
| verbose: true); |
| _print('compiling $app'); |
| var result = await client.compile(); |
| client.accept(); |
| _print('done compiling $app'); |
| |
| Process appProcess; |
| final vmServiceCompleter = Completer<VmService>(); |
| appProcess = await Process.start(Platform.resolvedExecutable, |
| ['--observe', '--no-pause-isolates-on-exit', result!.dillOutput]); |
| appProcess.stdout |
| .transform(utf8.decoder) |
| .transform(const LineSplitter()) |
| .listen((line) { |
| stdout.writeln('APP -> $line'); |
| if (line.startsWith('Observatory listening on')) { |
| var observatoryUri = |
| '${line.split(' ').last.replaceFirst('http', 'ws')}ws'; |
| vmServiceCompleter.complete(vmServiceConnectUri(observatoryUri)); |
| } |
| }); |
| appProcess.stderr |
| .transform(utf8.decoder) |
| .transform(const LineSplitter()) |
| .listen((line) { |
| stderr.writeln('APP -> $line'); |
| }); |
| |
| final vmService = await vmServiceCompleter.future; |
| |
| _print('editing $app'); |
| var appFile = File(app); |
| var originalContent = await appFile.readAsString(); |
| var newContent = originalContent.replaceFirst('hello', 'goodbye'); |
| await appFile.writeAsString(newContent); |
| |
| _print('recompiling $app with edits'); |
| result = await client.compile([Uri.parse('org-dartlang-root:///$app')]); |
| client.accept(); |
| _print('done recompiling $app'); |
| _print('reloading $app'); |
| var vm = await vmService.getVM(); |
| await vmService.reloadSources(vm.isolates!.first.id!, |
| rootLibUri: result!.dillOutput); |
| |
| _print('restoring $app to original contents'); |
| await appFile.writeAsString(originalContent); |
| _print('exiting'); |
| await client.shutdown().timeout(const Duration(seconds: 1), onTimeout: () { |
| client.kill(); |
| return 1; |
| }); |
| } |
| |
| void _print(String message) { |
| print('${watch.elapsed}: $message'); |
| } |
| |
| final app = 'example/app/main.dart'; |
| final outputDill = p.join('.dart_tool', 'out', 'example_app.dill'); |
| final sdkDir = p.dirname(p.dirname(Platform.resolvedExecutable)); |
| final watch = Stopwatch(); |