Breadcrumbs
Sentry uses breadcrumbs to create a trail of events that happened prior to an issue. These events are very similar to traditional logs, but can record more rich structured data.
This page provides an overview of manual breadcrumb recording and customization. Learn more about the information that displays on the Issue Details page and how you can filter breadcrumbs to quickly resolve issues in Using Breadcrumbs.
Learn about SDK usage
Developers who want to modify the breadcrumbs interface can learn more in our developer documentation about the Breadcrumbs Interface.
You can manually add breadcrumbs whenever something interesting happens. For example, you might manually record a breadcrumb if the user authenticates or another state change occurs.
Manually record a breadcrumb:
import 'package:sentry/sentry.dart';
Sentry.addBreadcrumb(Breadcrumb(message: 'Authenticated user'));
To track automatic Breadcrumbs for HTTP requests, you can add a Sentry wrapper that does it automatically for you.
This is only possible if you are using the http.Client class from the http library.
The SentryHttpClient
can be used as a standalone client like this:
import 'package:http/http.dart' as http;
import 'package:sentry/sentry.dart';
final client = SentryHttpClient();
try {
final url = 'https://example.com/whatsit/create';
final response = await client.post(url, body: {
'name': 'doodle',
'color': 'blue',
});
print('Response body: ${response.body}');
} finally {
client.close();
}
The SentryHttpClient
can also be used as a wrapper for your own HTTP Client
:
import 'package:http/http.dart' as http;
import 'package:sentry/sentry.dart';
final myClient = http.Client();
final client = SentryHttpClient(client: myClient);
try {
final url = 'https://example.com/whatsit/create';
final response = await client.post(url, body: {
'name': 'doodle',
'color': 'blue',
});
print('Response body: ${response.body}');
} finally {
client.close();
}
SDKs allow you to customize breadcrumbs through the beforeBreadcrumb
hook.
This hook is passed an already assembled breadcrumb and, in some SDKs, an optional hint. The function can modify the breadcrumb or decide to discard it entirely by returning null
:
import 'package:sentry/sentry.dart';
Breadcrumb? beforeBreadcrumb(Breadcrumb? breadcrumb, Hint hint) {
return 'a.spammy.Logger' == breadcrumb.category ? null : breadcrumb;
}
Future<void> main() async {
await Sentry.init((options) => options.beforeBreadcrumb = beforeBreadcrumb);
}
For information about what can be done with the hint, see Filtering Events.
Our documentation is open source and available on GitHub. Your contributions are welcome, whether fixing a typo (drat!) or suggesting an update ("yeah, this would be better").
- Package:
- pub:sentry
- Version:
- 8.0.0
- Repository:
- https://github.com/getsentry/sentry-dart
- API Documentation:
- https://pub.dev/documentation/sentry/latest/