sentry_flutter 4.0.0-beta.2

Sentry SDK for Flutter. This package aims to support different Flutter targets by relying on the many platforms supported by Sentry with native SDKs.

example/lib/main.dart

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:sentry_flutter/sentry_flutter.dart';
import 'package:universal_platform/universal_platform.dart';

// ATTENTION: Change the DSN below with your own to see the events in Sentry. Get one at sentry.io
const String _exampleDsn =
    'https://[e-mail]/5428562';

Future<void> main() async {
  await SentryFlutter.init(
    (options) {
      options.dsn = _exampleDsn;
      // use breadcrumb tracking of WidgetsBindingObserver
      //options.useFlutterBreadcrumbTracking();
      // use breadcrumb tracking of platform Sentry SDKs
      options.useNativeBreadcrumbTracking();
    },
    // Init your App.
    appRunner: () => runApp(MyApp()),
  );
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorObservers: [
        SentryNavigatorObserver(),
      ],
      home: const MainScaffold(),
    );
  }
}

class MainScaffold extends StatelessWidget {
  const MainScaffold({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Sentry Flutter Example')),
      body: SingleChildScrollView(
        child: Column(
          children: [
            const Center(child: Text('Trigger an action:\n')),
            RaisedButton(
              child: const Text('Open another Scaffold'),
              onPressed: () => SecondaryScaffold.openSecondaryScaffold(context),
            ),
            RaisedButton(
              child: const Text('Dart: try catch'),
              onPressed: () => tryCatch(),
            ),
            RaisedButton(
              child: const Text('Flutter error : Scaffold.of()'),
              onPressed: () => Scaffold.of(context)
                  .showBottomSheet<dynamic>((context) => null),
            ),
            RaisedButton(
              child: const Text('Dart: throw null'),
              // Warning : not captured if a debugger is attached
              // https://github.com/flutter/flutter/issues/48972
              onPressed: () => throw null,
            ),
            RaisedButton(
              child: const Text('Dart: assert'),
              onPressed: () {
                // Only relevant in debug builds
                // Warning : not captured if a debugger is attached
                // https://github.com/flutter/flutter/issues/48972
                assert(false, 'assert failure');
              },
            ),
            RaisedButton(
                child: const Text('Dart: async throws'),
                onPressed: () async => asyncThrows().catchError(handleError)),
            RaisedButton(
              child: const Text('Dart: Fail in microtask.'),
              onPressed: () async => {
                await Future.microtask(
                  () => throw StateError('Failure in a microtask'),
                ).catchError(handleError)
              },
            ),
            RaisedButton(
              child: const Text('Dart: Fail in compute'),
              onPressed: () async =>
                  {await compute(loop, 10).catchError(handleError)},
            ),
            RaisedButton(
              child: const Text('Dart: Web request'),
              onPressed: () => makeWebRequest(context),
            ),
            if (UniversalPlatform.isIOS) const CocoaExample(),
            if (UniversalPlatform.isAndroid) const AndroidExample(),
            if (UniversalPlatform.isWeb) const WebExample(),
          ],
        ),
      ),
    );
  }
}

class AndroidExample extends StatelessWidget {
  const AndroidExample({Key key}) : super(key: key);

  // ignore: avoid_field_initializers_in_const_classes
  final channel = const MethodChannel('example.flutter.sentry.io');

  @override
  Widget build(BuildContext context) {
    return Column(children: [
      RaisedButton(
        child: const Text('Kotlin Throw unhandled exception'),
        onPressed: () async {
          await execute('throw');
        },
      ),
      RaisedButton(
        child: const Text('Kotlin Capture Exception'),
        onPressed: () async {
          await execute('capture');
        },
      ),
      RaisedButton(
        // ANR is disabled by default, enable it to test it
        child: const Text('ANR: UI blocked 6 seconds'),
        onPressed: () async {
          await execute('anr');
        },
      ),
      RaisedButton(
        child: const Text('C++ Capture message'),
        onPressed: () async {
          await execute('cpp_capture_message');
        },
      ),
      RaisedButton(
        child: const Text('C++ SEGFAULT'),
        onPressed: () async {
          await execute('crash');
        },
      ),
    ]);
  }

  Future<void> execute(String method) async {
    try {
      await channel.invokeMethod<void>(method);
    } catch (error, stackTrace) {
      await Sentry.captureException(error, stackTrace: stackTrace);
    }
  }
}

Future<void> tryCatch() async {
  try {
    throw StateError('try catch');
  } catch (error, stackTrace) {
    await Sentry.captureException(error, stackTrace: stackTrace);
  }
}

Future<void> handleError(dynamic error, dynamic stackTrace) async {
  await Sentry.captureException(error, stackTrace: stackTrace);
}

Future<void> asyncThrows() async {
  throw StateError('async throws');
}

class CocoaExample extends StatelessWidget {
  const CocoaExample({Key key}) : super(key: key);

  final channel = const MethodChannel('example.flutter.sentry.io');

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        RaisedButton(
          child: const Text('Swift fatalError'),
          onPressed: () async {
            await channel.invokeMethod<void>('fatalError');
          },
        ),
        RaisedButton(
          child: const Text('Swift Capture NSException'),
          onPressed: () async {
            await channel.invokeMethod<void>('capture');
          },
        ),
        RaisedButton(
          child: const Text('Swift Capture message'),
          onPressed: () async {
            await channel.invokeMethod<void>('capture_message');
          },
        ),
        RaisedButton(
          child: const Text('Objective-C Throw unhandled exception'),
          onPressed: () async {
            await channel.invokeMethod<void>('throw');
          },
        ),
        RaisedButton(
          child: const Text('Objective-C SEGFAULT'),
          onPressed: () async {
            await channel.invokeMethod<void>('crash');
          },
        ),
      ],
    );
  }
}

class WebExample extends StatelessWidget {
  const WebExample({Key key}) : super(key: key);

  final channel = const MethodChannel('example.flutter.sentry.io');

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        RaisedButton(
          child: const Text('Web: console.log'),
          onPressed: () async {
            await channel.invokeMethod<void>('console.log', 'log me');
          },
        ),
      ],
    );
  }
}

/// compute can only take a top-level function, but not instance or static methods.
// Top-level functions are functions declared not inside a class and not inside another function
int loop(int val) {
  var count = 0;
  for (var i = 1; i <= val; i++) {
    count += i;
  }

  throw StateError('from a compute isolate $count');
}

class SecondaryScaffold extends StatelessWidget {
  static Future<void> openSecondaryScaffold(BuildContext context) {
    return Navigator.push(
      context,
      MaterialPageRoute<void>(
        settings:
            const RouteSettings(name: 'SecondaryScaffold', arguments: 'foobar'),
        builder: (context) {
          return SecondaryScaffold();
        },
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('SecondaryScaffold'),
      ),
      body: Center(
        child: Column(
          children: [
            const Text(
              'You have added a navigation event '
              'to the crash reports breadcrumbs.',
            ),
            MaterialButton(
              child: const Text('Go back'),
              onPressed: () {
                Navigator.pop(context);
              },
            ),
          ],
        ),
      ),
    );
  }
}

Future<void> makeWebRequest(BuildContext context) async {
  final client = SentryHttpClient();
  // We don't do any exception handling here.
  // In case of an exception, let it get caught and reported to Sentry
  final response = await client.get('https://flutter.dev/');

  await showDialog<void>(
    context: context,
    // gets tracked if using SentryNavigationObserver
    routeSettings: RouteSettings(
      name: 'flutter.dev dialog',
    ),
    builder: (context) {
      return AlertDialog(
        title: Text('Response ${response.statusCode}'),
        content: SingleChildScrollView(
          child: Text(response.body),
        ),
        actions: [
          MaterialButton(
            child: Text('Close'),
            onPressed: () => Navigator.pop(context),
          )
        ],
      );
    },
  );
}