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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.
part of reporting;
/// Tells crash backend that the error is from the Flutter CLI.
const String _kProductId = 'Flutter_Tools';
/// Tells crash backend that this is a Dart error as opposed to, say, Java.
const String _kDartTypeId = 'DartError';
/// Crash backend host.
const String _kCrashServerHost = '';
/// Path to the crash servlet.
const String _kCrashEndpointPath = '/cr/report';
/// The field corresponding to the multipart/form-data file attachment where
/// crash backend expects to find the Dart stack trace.
const String _kStackTraceFileField = 'DartError';
/// The name of the file attached as [_kStackTraceFileField].
/// The precise value is not important. It is ignored by the crash back end, but
/// it must be supplied in the request.
const String _kStackTraceFilename = 'stacktrace_file';
class CrashDetails {
@required this.command,
@required this.error,
@required this.stackTrace,
@required this.doctorText,
final String command;
final dynamic error;
final StackTrace stackTrace;
final String doctorText;
/// Reports information about the crash to the user.
class CrashReporter {
@required FileSystem fileSystem,
@required Logger logger,
@required FlutterProjectFactory flutterProjectFactory,
@required HttpClient client,
}) : _fileSystem = fileSystem,
_logger = logger,
_flutterProjectFactory = flutterProjectFactory,
_client = client;
final FileSystem _fileSystem;
final Logger _logger;
final FlutterProjectFactory _flutterProjectFactory;
final HttpClient _client;
/// Prints instructions for filing a bug about the crash.
Future<void> informUser(CrashDetails details, File crashFile) async {
_logger.printError('A crash report has been written to ${crashFile.path}.');
_logger.printStatus('This crash may already be reported. Check GitHub for similar crashes.', emphasis: true);
final String similarIssuesURL = GitHubTemplateCreator.toolCrashSimilarIssuesURL(details.error.toString());
_logger.printStatus('$similarIssuesURL\n', wrap: false);
_logger.printStatus('To report your crash to the Flutter team, first read the guide to filing a bug.', emphasis: true);
_logger.printStatus('\n', wrap: false);
_logger.printStatus('Create a new GitHub issue by pasting this link into your browser and completing the issue template. Thank you!', emphasis: true);
final GitHubTemplateCreator gitHubTemplateCreator = GitHubTemplateCreator(
fileSystem: _fileSystem,
logger: _logger,
flutterProjectFactory: _flutterProjectFactory,
client: _client,
final String gitHubTemplateURL = await gitHubTemplateCreator.toolCrashIssueTemplateGitHubURL(
_logger.printStatus('$gitHubTemplateURL\n', wrap: false);
/// Sends crash reports to Google.
/// To override the behavior of this class, define a
/// `FLUTTER_CRASH_SERVER_BASE_URL` environment variable that points to a custom
/// crash reporting server. This is useful if your development environment is
/// behind a firewall and unable to send crash reports to Google, or when you
/// wish to use your own server for collecting crash reports from Flutter Tools.
class CrashReportSender {
@required http.Client client,
@required Usage usage,
@required Platform platform,
@required Logger logger,
@required OperatingSystemUtils operatingSystemUtils,
}) : _client = client,
_usage = usage,
_platform = platform,
_logger = logger,
_operatingSystemUtils = operatingSystemUtils;
final http.Client _client;
final Usage _usage;
final Platform _platform;
final Logger _logger;
final OperatingSystemUtils _operatingSystemUtils;
bool _crashReportSent = false;
Uri get _baseUrl {
final String overrideUrl = _platform.environment['FLUTTER_CRASH_SERVER_BASE_URL'];
if (overrideUrl != null) {
return Uri.parse(overrideUrl);
return Uri(
scheme: 'https',
host: _kCrashServerHost,
port: 443,
path: _kCrashEndpointPath,
/// Sends one crash report.
/// The report is populated from data in [error] and [stackTrace].
Future<void> sendReport({
@required dynamic error,
@required StackTrace stackTrace,
@required String getFlutterVersion(),
@required String command,
}) async {
// Only send one crash report per run.
if (_crashReportSent) {
try {
final String flutterVersion = getFlutterVersion();
// We don't need to report exceptions happening on user branches
if (_usage.suppressAnalytics || RegExp(r'^\[user-branch\]\/').hasMatch(flutterVersion)) {
_logger.printTrace('Sending crash report to Google.');
final Uri uri = _baseUrl.replace(
queryParameters: <String, String>{
'product': _kProductId,
'version': flutterVersion,
final http.MultipartRequest req = http.MultipartRequest('POST', uri);
req.fields['uuid'] = _usage.clientId;
req.fields['product'] = _kProductId;
req.fields['version'] = flutterVersion;
req.fields['osName'] = _platform.operatingSystem;
req.fields['osVersion'] =; // this actually includes version
req.fields['type'] = _kDartTypeId;
req.fields['error_runtime_type'] = '${error.runtimeType}';
req.fields['error_message'] = '$error';
req.fields['comments'] = command;
filename: _kStackTraceFilename,
final http.StreamedResponse resp = await _client.send(req);
if (resp.statusCode == 200) {
final String reportId = await http.ByteStream(
_logger.printTrace('Crash report sent (report ID: $reportId)');
_crashReportSent = true;
} else {
_logger.printError('Failed to send crash report. Server responded with HTTP status code ${resp.statusCode}');
// Catch all exceptions to print the message that makes clear that the
// crash logger crashed.
} catch (sendError, sendStackTrace) { // ignore: avoid_catches_without_on_clauses
if (sendError is SocketException || sendError is HttpException || sendError is http.ClientException) {
_logger.printError('Failed to send crash report due to a network error: $sendError');
} else {
// If the sender itself crashes, just print. We did our best.
_logger.printError('Crash report sender itself crashed: $sendError\n$sendStackTrace');