flutter/packages/flutter_tools/lib/src/commands/refresh.dart

// Copyright 2016 The Chromium 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:io';

import 'package:path/path.dart' as path;

import '../android/android_device.dart';
import '../globals.dart';
import '../runner/flutter_command.dart';

class RefreshCommand extends FlutterCommand {
  @override
  final String name = 'refresh';

  @override
  final String description = 'Build and deploy the Dart code in a Flutter app (Android only).';

  RefreshCommand() {
    usesTargetOption();
  }

  @override
  bool get androidOnly => true;

  @override
  bool get requiresDevice => true;

  @override
  Future<int> runInProject() async {
    printTrace('Downloading toolchain.');

    await Future.wait([
      downloadToolchain(),
      downloadApplicationPackages(),
    ], eagerError: true);

    Directory tempDir = await Directory.systemTemp.createTemp('flutter_tools');
    try {
      String snapshotPath = path.join(tempDir.path, 'snapshot_blob.bin');

      int result = await toolchain.compiler.createSnapshot(
          mainPath: argResults['target'], snapshotPath: snapshotPath
      );
      if (result != 0) {
        printError('Failed to run the Flutter compiler. Exit code: $result');
        return result;
      }

      AndroidDevice device = deviceForCommand;

      bool success = await device.refreshSnapshot(
        applicationPackages.android, snapshotPath
      );
      if (!success) {
        printError('Error refreshing snapshot on $device.');
        return 1;
      }

      return 0;
    } finally {
      tempDir.deleteSync(recursive: true);
    }
  }
}