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70 lines
2.3 KiB
Dart
70 lines
2.3 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import '../android/android_device.dart';
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import '../application_package.dart';
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import '../globals.dart';
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import '../runner/flutter_command.dart';
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class TraceCommand extends FlutterCommand {
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TraceCommand() {
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argParser.addFlag('start', negatable: false, help: 'Start tracing.');
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argParser.addFlag('stop', negatable: false, help: 'Stop tracing.');
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argParser.addOption('out', help: 'Specify the path of the saved trace file.');
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argParser.addOption('duration',
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defaultsTo: '10', abbr: 'd', help: 'Duration in seconds to trace.');
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}
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@override
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final String name = 'trace';
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@override
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final String description = 'Start and stop tracing for a running Flutter app (Android only).';
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@override
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final String usageFooter =
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'\`trace\` called with no arguments will automatically start tracing, delay a set amount of\n'
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'time (controlled by --duration), and stop tracing. To explicitly control tracing, call trace\n'
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'with --start and later with --stop.';
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@override
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bool get androidOnly => true;
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@override
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bool get requiresDevice => true;
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@override
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Future<int> runInProject() async {
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ApplicationPackage androidApp = applicationPackages.android;
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AndroidDevice device = deviceForCommand;
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if ((!argResults['start'] && !argResults['stop']) ||
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(argResults['start'] && argResults['stop'])) {
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// Setting neither flags or both flags means do both commands and wait
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// duration seconds in between.
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device.startTracing(androidApp);
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await new Future<Null>.delayed(
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new Duration(seconds: int.parse(argResults['duration'])),
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() => _stopTracing(device, androidApp)
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);
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} else if (argResults['stop']) {
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await _stopTracing(device, androidApp);
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} else {
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device.startTracing(androidApp);
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}
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return 0;
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}
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Future<Null> _stopTracing(AndroidDevice android, AndroidApk androidApp) async {
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String tracePath = await android.stopTracing(androidApp, outPath: argResults['out']);
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if (tracePath == null) {
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printError('No trace file saved.');
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} else {
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printStatus('Trace file saved to $tracePath');
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}
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}
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}
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