Fix: Duplicated Android Breadcrumbs with no Mechanism (#954)

Author: denrase

CHANGELOG.md

@@ -7,6 +7,7 @@
 * Maps with Key Object, Object would fail during serialization if not String, Object ([#935](https://github.com/getsentry/sentry-dart/pull/935))
 * Breadcrumbs "Concurrent Modification" ([#948](https://github.com/getsentry/sentry-dart/pull/948))
 * Duplicative Screen size changed breadcrumbs ([#888](https://github.com/getsentry/sentry-dart/pull/888))
+* Duplicated Android Breadcrumbs with no Mechanism ([#954](https://github.com/getsentry/sentry-dart/pull/954))
 * Fix windows native method need default result ([#943](https://github.com/getsentry/sentry-dart/pull/943))
 
 ### Features

dart/lib/src/sentry_client.dart

@@ -378,12 +378,13 @@ class SentryClient {
   }
 
   SentryEvent _eventWithRemovedBreadcrumbsIfHandled(SentryEvent event) {
-    final exceptions = event.exceptions ?? [];
-    final handled = exceptions.isNotEmpty
-        ? exceptions.first.mechanism?.handled == true
-        : false;
+    final mechanisms =
+        (event.exceptions ?? []).map((e) => e.mechanism).whereType<Mechanism>();
+    final hasNoMechanism = mechanisms.isEmpty;
+    final hasOnlyHandledMechanism =
+        mechanisms.every((e) => (e.handled ?? true));
 
-    if (handled) {
+    if (hasNoMechanism || hasOnlyHandledMechanism) {
       return event.copyWith(breadcrumbs: []);
     } else {
       return event;

dart/test/mocks/mock_platform.dart

@@ -9,9 +9,10 @@ class MockPlatform extends Platform with NoSuchMethodProvider {
     return MockPlatform(os: 'android');
   }
 
-  @override
-  String operatingSystem;
+  factory MockPlatform.iOS() {
+    return MockPlatform(os: 'ios');
+  }
 
   @override
-  bool get isAndroid => (operatingSystem == 'android');
+  String operatingSystem;
 }

dart/test/sentry_client_test.dart

@@ -898,6 +898,52 @@ void main() {
       expect((capturedEvent.breadcrumbs ?? []).isEmpty, true);
     });
 
+    test('Clears breadcrumbs on Android if mechanism.handled is null',
+        () async {
+      fixture.options.enableScopeSync = true;
+      fixture.options.platformChecker =
+          MockPlatformChecker(platform: MockPlatform.android());
+
+      final client = fixture.getSut();
+      final event = SentryEvent(exceptions: [
+        SentryException(
+          type: "type",
+          value: "value",
+          mechanism: Mechanism(type: 'type'),
+        )
+      ], breadcrumbs: [
+        Breadcrumb()
+      ]);
+      await client.captureEvent(event);
+
+      final capturedEnvelope = (fixture.transport).envelopes.first;
+      final capturedEvent = await eventFromEnvelope(capturedEnvelope);
+
+      expect((capturedEvent.breadcrumbs ?? []).isEmpty, true);
+    });
+
+    test('Clears breadcrumbs on Android if theres no mechanism', () async {
+      fixture.options.enableScopeSync = true;
+      fixture.options.platformChecker =
+          MockPlatformChecker(platform: MockPlatform.android());
+
+      final client = fixture.getSut();
+      final event = SentryEvent(exceptions: [
+        SentryException(
+          type: "type",
+          value: "value",
+        )
+      ], breadcrumbs: [
+        Breadcrumb()
+      ]);
+      await client.captureEvent(event);
+
+      final capturedEnvelope = (fixture.transport).envelopes.first;
+      final capturedEvent = await eventFromEnvelope(capturedEnvelope);
+
+      expect((capturedEvent.breadcrumbs ?? []).isEmpty, true);
+    });
+
     test('Does not clear breadcrumbs on Android if mechanism.handled is false',
         () async {
       fixture.options.enableScopeSync = true;
@@ -924,6 +970,42 @@ void main() {
 
       expect((capturedEvent.breadcrumbs ?? []).isNotEmpty, true);
     });
+
+    test(
+        'Does not clear breadcrumbs on Android if any mechanism.handled is false',
+        () async {
+      fixture.options.enableScopeSync = true;
+      fixture.options.platformChecker =
+          MockPlatformChecker(platform: MockPlatform.android());
+
+      final client = fixture.getSut();
+      final event = SentryEvent(exceptions: [
+        SentryException(
+          type: "type",
+          value: "value",
+          mechanism: Mechanism(
+            type: 'type',
+            handled: true,
+          ),
+        ),
+        SentryException(
+          type: "type",
+          value: "value",
+          mechanism: Mechanism(
+            type: 'type',
+            handled: false,
+          ),
+        )
+      ], breadcrumbs: [
+        Breadcrumb()
+      ]);
+      await client.captureEvent(event);
+
+      final capturedEnvelope = (fixture.transport).envelopes.first;
+      final capturedEvent = await eventFromEnvelope(capturedEnvelope);
+
+      expect((capturedEvent.breadcrumbs ?? []).isNotEmpty, true);
+    });
   });
 
   group('ClientReportRecorder', () {
@@ -1118,7 +1200,8 @@ class Fixture {
   final recorder = MockClientReportRecorder();
   final transport = MockTransport();
 
-  final options = SentryOptions(dsn: fakeDsn);
+  final options = SentryOptions(dsn: fakeDsn)
+    ..platformChecker = MockPlatformChecker(platform: MockPlatform.iOS());
 
   late SentryTransactionContext _context;
   late SentryTracer tracer;