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Merge pull request #443 from matrix-org/markjh/commentary

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Add commentary for fix in PR #442
This commit is contained in:
Mark Haines 2015-12-14 15:48:00 +00:00
commit 910956b0ec
1 changed files with 15 additions and 2 deletions
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17
synapse/rest/client/v2_alpha/sync.py
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@ -351,14 +351,27 @@ class SyncRestServlet(RestServlet):
continue
prev_event_id = timeline_event.unsigned.get("replaces_state", None)
logger.debug("Replacing %s with %s in state dict",
timeline_event.event_id, prev_event_id)
prev_content = timeline_event.unsigned.get('prev_content')
prev_sender = timeline_event.unsigned.get('prev_sender')
# Empircally it seems possible for the event to have a
# "replaces_state" key but not a prev_content or prev_sender
# markjh conjectures that it could be due to the server not
# having a copy of that event.
# If this is the case the we ignore the previous event. This will
# cause the displayname calculations on the client to be incorrect
if prev_event_id is None or not prev_content or not prev_sender:
logger.debug(
"Removing %r from the state dict, as it is missing"
" prev_content (prev_event_id=%r)",
timeline_event.event_id, prev_event_id
)
del result[event_key]
else:
logger.debug(
"Replacing %r with %r in state dict",
timeline_event.event_id, prev_event_id
)
result[event_key] = FrozenEvent({
"type": timeline_event.type,
"state_key": timeline_event.state_key,