sentry_link 0.5.1

Automatic capture of exceptions and GraphQL errors for the gql eco-system, like graphql and ferry

Sentry Link (GraphQL)

Compatibility list

This integration is compatible with the following packages. It's also compatible with other packages which are build on gql suite of packages.

package	stats
gql_link
graphql
ferry
artemis

Usage

Just add SentryGql.link() to your links. It will add error reporting and performance monitoring to your GraphQL operations.

final link = Link.from([
    AuthLink(getToken: () async => 'Bearer $personalAccessToken'),
    // SentryLink records exceptions
    SentryGql.link(
      shouldStartTransaction: true,
      graphQlErrorsMarkTransactionAsFailed: true,
    ),
    HttpLink('https://api.github.com/graphql'),
]);

A GraphQL errors will be reported as seen in the example below:

Given the following query with an error

query LoadPosts($id: ID!) {
  post(id: $id) {
    id
    # This word is intentionally misspelled to trigger a GraphQL error
    titl
    body
  }
}

it will be represented in Sentry as seen in the image

Improve exception reports for LinkExceptions

LinkExceptions and it subclasses can be arbitrary deeply nested. By adding an exception extractor for it, Sentry can create significantly improved exception reports.

Sentry.init((options) {
  options.addGqlExtractors();
});

Performance traces for serialization and parsing

The SentryResponseParser and SentryRequestSerializer classes can be used to trace the de/serialization process. Both classes work with the HttpLink and the DioLink. When using the HttpLink, you can additionally use the sentryResponseDecoder function as explained further down below.

Example for HttpLink

This example uses the http integration in addition to this gql integration.

import 'package:sentry/sentry.dart';
import 'package:sentry_link/sentry_link.dart';

final link = Link.from([
    AuthLink(getToken: () async => 'Bearer $personalAccessToken'),
    SentryGql.link(
      shouldStartTransaction: true,
      graphQlErrorsMarkTransactionAsFailed: true,
    ),
    HttpLink(
      'https://api.github.com/graphql',
      httpClient: SentryHttpClient(),
      serializer: SentryRequestSerializer(),
      parser: SentryResponseParser(),
    ),
  ]);

Example for DioLink

This example uses the sentry_dio integration in addition to this gql integration.

import 'package:sentry_link/sentry_link.dart';
import 'package:sentry_dio/sentry_dio.dart';

final link = Link.from([
    AuthLink(getToken: () async => 'Bearer $personalAccessToken'),
    SentryGql.link(
      shouldStartTransaction: true,
      graphQlErrorsMarkTransactionAsFailed: true,
    ),
    DioLink(
      'https://api.github.com/graphql',
      client: Dio()..addSentry(),
      serializer: SentryRequestSerializer(),
      parser: SentryResponseParser(),
    ),
  ]);

HttpLink

Bonus HttpLink tracing

import 'dart:async';
import 'dart:convert';

import 'package:sentry/sentry.dart';
import 'package:http/http.dart' as http;

import 'package:sentry_link/sentry_link.dart';

final link = Link.from([
  AuthLink(getToken: () async => 'Bearer $personalAccessToken'),
  SentryGql.link(
    shouldStartTransaction: true,
    graphQlErrorsMarkTransactionAsFailed: true,
  ),
  HttpLink(
    'https://api.github.com/graphql',
    httpClient: SentryHttpClient(networkTracing: true),
    serializer: SentryRequestSerializer(),
    parser: SentryResponseParser(),
    httpResponseDecoder: sentryResponseDecoder,
  ),
]);

Map<String, dynamic>? sentryResponseDecoder(
  http.Response response, {
  Hub? hub,
}) {
  final currentHub = hub ?? HubAdapter();
  final span = currentHub.getSpan()?.startChild(
        'serialize.http.client',
        description: 'http response deserialization',
      );
  Map<String, dynamic>? result;
  try {
    result = _defaultHttpResponseDecoder(response);
    span?.status = const SpanStatus.ok();
  } catch (e) {
    span?.status = const SpanStatus.unknownError();
    span?.throwable = e;
    rethrow;
  } finally {
    unawaited(span?.finish());
  }
  return result;
}

Map<String, dynamic>? _defaultHttpResponseDecoder(http.Response httpResponse) {
  return json.decode(utf8.decode(httpResponse.bodyBytes))
      as Map<String, dynamic>?;
}

Filter redundant HTTP breadcrumbs

If you use the sentry_dio or http you will have breadcrumbs attached for every HTTP request. In order to not have duplicated breadcrumbs from the HTTP integrations and this GraphQL integration, you should filter those breadcrumbs.

That can be achieved in two ways:

1. Disable all HTTP breadcrumbs.
2. Use beforeBreadcrumb.

return Sentry.init(
  (options) {
    options.beforeBreadcrumb = graphQlFilter();
    // or 
    options.beforeBreadcrumb = graphQlFilter((breadcrumb, hint) {
      // custom filter
      return breadcrumb;
    });
  },
);

Additional graphql usage hints

Additional hints for usage with graphql

import 'package:sentry/sentry.dart';
import 'package:sentry_link/sentry_link.dart';
import 'package:graphql/graphql.dart';

Sentry.init((options) {
  options.addExceptionCauseExtractor(UnknownExceptionExtractor());
  options.addExceptionCauseExtractor(NetworkExceptionExtractor());
  options.addExceptionCauseExtractor(CacheMissExceptionExtractor());
  options.addExceptionCauseExtractor(OperationExceptionExtractor());
  options.addExceptionCauseExtractor(CacheMisconfigurationExceptionExtractor());
  options.addExceptionCauseExtractor(MismatchedDataStructureExceptionExtractor());
  options.addExceptionCauseExtractor(UnexpectedResponseStructureExceptionExtractor());
});

class UnknownExceptionExtractor
    extends LinkExceptionExtractor<UnknownException> {}

class NetworkExceptionExtractor
    extends LinkExceptionExtractor<NetworkException> {}

class CacheMissExceptionExtractor
    extends LinkExceptionExtractor<CacheMissException> {}

class CacheMisconfigurationExceptionExtractor
    extends LinkExceptionExtractor<CacheMisconfigurationException> {}

class MismatchedDataStructureExceptionExtractor
    extends LinkExceptionExtractor<MismatchedDataStructureException> {}

class UnexpectedResponseStructureExceptionExtractor
    extends LinkExceptionExtractor<UnexpectedResponseStructureException> {}

class OperationExceptionExtractor extends ExceptionCauseExtractor<T> {
  @override
  ExceptionCause? cause(T error) {
    return ExceptionCause(error.linkException, error.originalStackTrace);
  }
}

📣 About the author

• 
•