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bugfix: always prefer unthreaded receipt when >1 exist (MSC4102) (#16927)

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Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
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kegsay 2024-02-20 14:12:06 +00:00 committed by GitHub
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2 changed files with 19 additions and 3 deletions
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changelog.d/16927.bugfix Normal file
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@ -0,0 +1 @@
Always prefer unthreaded receipt when >1 exist ([MSC4102](https://github.com/matrix-org/matrix-spec-proposals/pull/4102)).

17
synapse/storage/databases/main/receipts.py
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@ -472,7 +472,22 @@ class ReceiptsWorkerStore(SQLBaseStore):
event_entry = room_event["content"].setdefault(event_id, {})
receipt_type_dict = event_entry.setdefault(receipt_type, {})
receipt_type_dict[user_id] = db_to_json(data)
# MSC4102: always replace threaded receipts with unthreaded ones if there is a clash.
# Specifically:
# - if there is no existing receipt, great, set the data.
# - if there is an existing receipt, is it threaded (thread_id present)?
# YES: replace if this receipt has no thread id. NO: do not replace.
# This means we will drop some receipts, but MSC4102 is designed to drop semantically
# meaningless receipts, so this is okay. Previously, we would drop meaningful data!
receipt_data = db_to_json(data)
if user_id in receipt_type_dict: # existing receipt
# is the existing receipt threaded and we are currently processing an unthreaded one?
if "thread_id" in receipt_type_dict[user_id] and not thread_id:
receipt_type_dict[
user_id
] = receipt_data # replace with unthreaded one
else: # receipt does not exist, just set it
receipt_type_dict[user_id] = receipt_data
if thread_id:
receipt_type_dict[user_id]["thread_id"] = thread_id