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Return the previous stream token if a non-member event is a duplicate. (#8093)

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Patrick Cloke 2020-08-18 07:53:23 -04:00 committed by GitHub
parent 8b6c176aee
commit 25e55d2598
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2 changed files with 16 additions and 10 deletions
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1
changelog.d/8093.bugfix Normal file
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@ -0,0 +1 @@
Return the previous stream token if a non-member event is a duplicate.

25
synapse/handlers/message.py
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@ -667,14 +667,14 @@ class EventCreationHandler(object):
assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
if event.is_state():
prev_state = await self.deduplicate_state_event(event, context)
if prev_state is not None:
prev_event = await self.deduplicate_state_event(event, context)
if prev_event is not None:
logger.info(
"Not bothering to persist state event %s duplicated by %s",
event.event_id,
prev_state.event_id,
prev_event.event_id,
)
return prev_state
return await self.store.get_stream_token_for_event(prev_event.event_id)
return await self.handle_new_client_event(
requester=requester, event=event, context=context, ratelimit=ratelimit
@ -682,27 +682,32 @@ class EventCreationHandler(object):
async def deduplicate_state_event(
self, event: EventBase, context: EventContext
) -> None:
) -> Optional[EventBase]:
"""
Checks whether event is in the latest resolved state in context.
If so, returns the version of the event in context.
Otherwise, returns None.
Args:
event: The event to check for duplication.
context: The event context.
Returns:
The previous verion of the event is returned, if it is found in the
event context. Otherwise, None is returned.
"""
prev_state_ids = await context.get_prev_state_ids()
prev_event_id = prev_state_ids.get((event.type, event.state_key))
if not prev_event_id:
return
return None
prev_event = await self.store.get_event(prev_event_id, allow_none=True)
if not prev_event:
return
return None
if prev_event and event.user_id == prev_event.user_id:
prev_content = encode_canonical_json(prev_event.content)
next_content = encode_canonical_json(event.content)
if prev_content == next_content:
return prev_event
return
return None
async def create_and_send_nonmember_event(
self,