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fix(llc): mark a message the server already stored as sent - #3051
VelikovPetar wants to merge 1 commit into
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
📝 WalkthroughWalkthroughDuplicate-message errors now leave locally stored messages marked as sent instead of failed. Channel state handling preserves a server creation date when available and uses the local date otherwise. Retry handling and tests cover duplicate responses. ChangesDuplicate Message State
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~12 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to Messages that the server rejects as already existing are now shown as sent rather than failed. In narrow cases, such as an unexpected error wording or a reused message ID, a message the server never stored could appear sent. The owners should confirm these edge cases before or soon after merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @packages/stream_chat/lib/src/client/channel/channel.dart:
- Around line 842-843: In the `isMessageAlreadyExistsError` branch, verify that
the server-stored message matches the attempted `message` before calling
`_markMessageAsSent`; ID occupancy alone must not mark different local text as
sent. Reconcile local state only after confirming the stored copy corresponds to
the attempted send.
Review comments at
@packages/stream_chat/lib/src/core/error/stream_chat_error.dart:
- Around line 170-173: Update the isMessageAlreadyExistsError getter to match a
complete observed duplicate-ID error pattern, keeping the message ID and
“already exists” within the same clause. Ensure unrelated input-error text
containing both fragments is not classified as a duplicate.
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📒 Files selected for processing (6)
packages/stream_chat/CHANGELOG.mdpackages/stream_chat/lib/src/client/channel/channel.dartpackages/stream_chat/lib/src/client/retry_queue.dartpackages/stream_chat/lib/src/core/error/stream_chat_error.dartpackages/stream_chat/test/src/client/channel/channel_test.dartpackages/stream_chat/test/src/core/error/stream_chat_error_test.dart
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #3051 +/- ##
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+ Coverage 78.02% 78.03% +0.01%
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Files 450 450
Lines 29320 29334 +14
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+ Hits 22877 22891 +14
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| } catch (e) { | ||
| if (e is StreamChatNetworkError && e.isMessageAlreadyExistsError) { | ||
| _markMessageAsSent(message); | ||
| rethrow; |
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Should we rethrow it if we are handling the exception?
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I don't think it should. The composer treats a throw as a failed send (_sendOrUpdateMessage in stream_message_composer.dart): onMessageSent never fires, and onError fires for a message the list shows as sent. An app that shows a "failed to send" toast from onError would show it for a message that was delivered.
Returning the local copy keeps both callbacks accurate:
if (e is StreamChatNetworkError && e.isMessageAlreadyExistsError) {
return SendMessageResponse()..message = _markMessageAsSent(message);
}This needs _markMessageAsSent to return the sent message (suggestion on that method). The new tests would then expect the future to complete instead of throwsA.
I tried this on the PR head, with the new tests changed to await the call (the timed-out test keeps its throwsA, since its first attempt really does time out). All 225 tests in channel_test.dart, stream_chat_error_test.dart and retry_queue_test.dart pass, and removing the duplicate branch makes the group fail.
If the rethrow stays, the sendMessage dartdoc should say that the future can still complete with an error after the message is marked as sent (STYLE_GUIDE, Writing prompts for good documentation: "If there are Future values involved, what are the guarantees? Can they complete with an error?").
| @@ -89,8 +89,9 @@ class RetryQueue { | |||
| } catch (error) { | |||
| logger?.severe('Error while retrying message ${message.id}', error); | |||
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lets log this only when we don't handle the error
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If sendMessage returns instead of rethrowing (see the other thread), the retry queue never sees this error. Then this change and _isAlreadySent can be reverted entirely. I checked: with retry_queue.dart reset to master, "marks a timed-out send as sent once its retry is rejected as a duplicate" still passes.
If the rethrow stays, skip the log for the handled case. Use continue rather than return, which would leave the loop with _isProcessing still true:
| logger?.severe('Error while retrying message ${message.id}', error); | |
| if (_isAlreadySent(error)) continue; | |
| logger?.severe('Error while retrying message ${message.id}', error); |
After that, the guard and comment below go back to master's comment and a plain channel.state?.updateMessage(message);. That also drops the "stored by the server" wording (STYLE_GUIDE, No server or transport details in docs or comments).
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I checked the error against the backend. It has one source, ErrMessageWithIDAlreadyExists (code 4, HTTP 400), and no other error contains both fragments, so the predicate is safe.
On porting to v11: v11 replaced StreamChatNetworkError with StreamChatException and deleted stream_chat_error.dart. channel.dart and retry_queue.dart merge there without conflicts but won't compile, so the getter needs a new home, for example an extension on StreamApiException checking code == StreamErrorCode.inputError. Two things keep that port small:
- Use
_whenSendingMessageonly in the new tests. 5 of the 6channel_test.dartconflicts against v11 come from the ~13 existing stubs it rewrites, and v11 already rewrote those with its ownapiException(...)helper. - Reverting
retry_queue.dart(see that thread) leaves one file fewer to port.
Smaller test notes:
_whenSendingMessage,_inputErrorand_messageAlreadyExistsErroruse nothing frommain(), so they can be top-level functions after it. That's where TESTING.md keeps setup helpers.- The
isMessageAlreadyExistsErrortests instream_chat_error_test.dartbuildStreamChatNetworkError.raw(...)with nodata, which also makesisRetriabletrue. A real 400 always carriesdata, so reusing the_inputErrorshape fromchannel_test.dartkeeps them realistic. - The new group is nested three levels deep in
channel_test.dart. TESTING.md calls more than one level of nesting a signal to split, and STYLE_GUIDE nameschannel_send_test.dartas the split for this file. v11 has no such file yet, so moving these five tests into one would also land on v11 without conflicts.
| /// Whether the server rejected a send because it already stored a message | ||
| /// with the same id. | ||
| @internal | ||
| bool get isMessageAlreadyExistsError => | ||
| errorCode == ChatErrorCode.inputError && | ||
| message.contains('a message with ID') && | ||
| message.contains('already exists'); |
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A wrapped && chain under => should be one early return per check (STYLE_GUIDE, Use braces for long function bodies).
| /// Whether the server rejected a send because it already stored a message | |
| /// with the same id. | |
| @internal | |
| bool get isMessageAlreadyExistsError => | |
| errorCode == ChatErrorCode.inputError && | |
| message.contains('a message with ID') && | |
| message.contains('already exists'); | |
| /// Whether the server rejected a send because it already stored a message | |
| /// with the same id. | |
| @internal | |
| bool get isMessageAlreadyExistsError { | |
| if (errorCode != ChatErrorCode.inputError) return false; | |
| if (!message.contains('a message with ID')) return false; | |
| return message.contains('already exists'); | |
| } |
| Message? _findMessageInLocalState(String messageId) => [ | ||
| ...state!.messages, | ||
| ...state!.threads.values.expand((messages) => messages), | ||
| ].firstWhereOrNull((it) => it.id == messageId); |
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=> forced onto a multi-line expression (STYLE_GUIDE, Use braces for long function bodies). followedBy also skips building the combined list.
| Message? _findMessageInLocalState(String messageId) => [ | |
| ...state!.messages, | |
| ...state!.threads.values.expand((messages) => messages), | |
| ].firstWhereOrNull((it) => it.id == messageId); | |
| Message? _findMessageInLocalState(String messageId) { | |
| final threadMessages = state!.threads.values.expand((messages) => messages); | |
| return state!.messages.followedBy(threadMessages).firstWhereOrNull((it) => it.id == messageId); | |
| } |
| void _markMessageAsSent(Message message) { | ||
| if (state == null) return; | ||
| final localStateMessage = _findMessageInLocalState(message.id) ?? message; | ||
| final sentMessage = localStateMessage.copyWith( | ||
| createdAt: localStateMessage.remoteCreatedAt ?? localStateMessage.localCreatedAt, | ||
| state: MessageState.sent, | ||
| ); | ||
| state?.updateMessage(sentMessage); | ||
| } |
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After the state == null guard, state?.updateMessage reads as "might be null" when it can't be, and _findMessageInLocalState already uses state!. The guard itself has to stay: dispose() clears state, so a channel disposed while the send is in flight reaches this catch with no state. Returning the sent message lets the call site build its response from it (see the rethrow thread).
| void _markMessageAsSent(Message message) { | |
| if (state == null) return; | |
| final localStateMessage = _findMessageInLocalState(message.id) ?? message; | |
| final sentMessage = localStateMessage.copyWith( | |
| createdAt: localStateMessage.remoteCreatedAt ?? localStateMessage.localCreatedAt, | |
| state: MessageState.sent, | |
| ); | |
| state?.updateMessage(sentMessage); | |
| } | |
| Message _markMessageAsSent(Message message) { | |
| if (state == null) return message.copyWith(state: MessageState.sent); | |
| final localStateMessage = _findMessageInLocalState(message.id) ?? message; | |
| final sentMessage = localStateMessage.copyWith( | |
| createdAt: localStateMessage.remoteCreatedAt ?? localStateMessage.localCreatedAt, | |
| state: MessageState.sent, | |
| ); | |
| state!.updateMessage(sentMessage); | |
| return sentMessage; | |
| } |
| _whenSendingMessage(client, channel, message).thenAnswer((_) async => throw errors[attempt++]); | ||
| await expectLater(channel.sendMessage(message), throwsA(isA<StreamChatNetworkError>())); | ||
| await pumpEventQueue(); | ||
|
|
||
| expect(channel.state!.messages.single.state, MessageState.sent); |
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errors[attempt++] hides the mutation inside an index (STYLE_GUIDE, Prefer += over ++).
| _whenSendingMessage(client, channel, message).thenAnswer((_) async => throw errors[attempt++]); | |
| await expectLater(channel.sendMessage(message), throwsA(isA<StreamChatNetworkError>())); | |
| await pumpEventQueue(); | |
| expect(channel.state!.messages.single.state, MessageState.sent); | |
| _whenSendingMessage(client, channel, message).thenAnswer((_) async { | |
| final error = errors[attempt]; | |
| attempt += 1; | |
| throw error; | |
| }); | |
| await expectLater(channel.sendMessage(message), throwsA(isA<StreamChatNetworkError>())); | |
| await pumpEventQueue(); | |
| expect(channel.state!.messages.single.state, MessageState.sent); |
| } catch (e) { | ||
| if (e is StreamChatNetworkError && e.isMessageAlreadyExistsError) { | ||
| _markMessageAsSent(message); | ||
| rethrow; |
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I don't think it should. The composer treats a throw as a failed send (_sendOrUpdateMessage in stream_message_composer.dart): onMessageSent never fires, and onError fires for a message the list shows as sent. An app that shows a "failed to send" toast from onError would show it for a message that was delivered.
Returning the local copy keeps both callbacks accurate:
if (e is StreamChatNetworkError && e.isMessageAlreadyExistsError) {
return SendMessageResponse()..message = _markMessageAsSent(message);
}This needs _markMessageAsSent to return the sent message (suggestion on that method). The new tests would then expect the future to complete instead of throwsA.
I tried this on the PR head, with the new tests changed to await the call (the timed-out test keeps its throwsA, since its first attempt really does time out). All 225 tests in channel_test.dart, stream_chat_error_test.dart and retry_queue_test.dart pass, and removing the duplicate branch makes the group fail.
If the rethrow stays, the sendMessage dartdoc should say that the future can still complete with an error after the message is marked as sent (STYLE_GUIDE, Writing prompts for good documentation: "If there are Future values involved, what are the guarantees? Can they complete with an error?").
| @@ -89,8 +89,9 @@ class RetryQueue { | |||
| } catch (error) { | |||
| logger?.severe('Error while retrying message ${message.id}', error); | |||
There was a problem hiding this comment.
If sendMessage returns instead of rethrowing (see the other thread), the retry queue never sees this error. Then this change and _isAlreadySent can be reverted entirely. I checked: with retry_queue.dart reset to master, "marks a timed-out send as sent once its retry is rejected as a duplicate" still passes.
If the rethrow stays, skip the log for the handled case. Use continue rather than return, which would leave the loop with _isProcessing still true:
| logger?.severe('Error while retrying message ${message.id}', error); | |
| if (_isAlreadySent(error)) continue; | |
| logger?.severe('Error while retrying message ${message.id}', error); |
After that, the guard and comment below go back to master's comment and a plain channel.state?.updateMessage(message);. That also drops the "stored by the server" wording (STYLE_GUIDE, No server or transport details in docs or comments).
| // The error returned when sending a message whose id already exists. | ||
| StreamChatNetworkError _messageAlreadyExistsError(String messageId) { |
There was a problem hiding this comment.
The comment restates the function name (STYLE_GUIDE, Minimize inline comments).
| // The error returned when sending a message whose id already exists. | |
| StreamChatNetworkError _messageAlreadyExistsError(String messageId) { | |
| StreamChatNetworkError _messageAlreadyExistsError(String messageId) { |
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Linear: FLU-952
Github Issue: #
CLA
Description of the pull request
When a send reaches the server but its response is lost (connection drop, timeout, edge 5xx) or the edge retries the request itself, the same message id is sent again and the server rejects it with HTTP 400, code 4,
a message with ID … already exists.Channel.sendMessagetreated that like any other failure, so a message the server stored was shown as failed, overwriting the server copy delivered bymessage.new, until the next reconnect re-queried the channel.What changes
StreamChatNetworkError.isMessageAlreadyExistsError(@internal) recognises the rejection: code 4 and a message containing botha message with IDandalready exists, so other code-4 "already exists" errors (poll options, votes) don't match.Channel.sendMessagemarks the message as sent on that rejection and still rethrows the error to the caller.message.newsurvives.RetryQueueno longer writes its failed copy back over the message after a retry gets this rejection.Alignment with iOS and Android (AND-1542, CHA-5603)
Testing
channel_test.dart(.sendMessage›when the message id already exists):message.newarrived first;stream_chat_error_test.dart.Screenshots / Videos
No UI changes.
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