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Merge pull request #6436 from matrix-org/babolivier/fix-state-retrieval

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Discard retention policies when retrieving state
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Brendan Abolivier 2019-11-29 11:25:11 +00:00 committed by GitHub
commit 6d8576c4ce
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3 changed files with 20 additions and 9 deletions
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1
changelog.d/6436.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug where a room could become unusable with a low retention policy and a low activity.

2
synapse/handlers/message.py
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@ -138,7 +138,7 @@ class MessageHandler(object):
raise NotFoundError("Can't find event for token %s" % (at_token,)) raise NotFoundError("Can't find event for token %s" % (at_token,))
visible_events = yield filter_events_for_client( visible_events = yield filter_events_for_client(
self.storage, user_id, last_events self.storage, user_id, last_events, apply_retention_policies=False
) )
event = last_events[0] event = last_events[0]

26
synapse/visibility.py
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@ -44,7 +44,12 @@ MEMBERSHIP_PRIORITY = (
@defer.inlineCallbacks @defer.inlineCallbacks
def filter_events_for_client( def filter_events_for_client(
storage: Storage, user_id, events, is_peeking=False, always_include_ids=frozenset() storage: Storage,
user_id,
events,
is_peeking=False,
always_include_ids=frozenset(),
apply_retention_policies=True,
): ):
""" """
Check which events a user is allowed to see Check which events a user is allowed to see
@ -59,6 +64,10 @@ def filter_events_for_client(
events events
always_include_ids (set(event_id)): set of event ids to specifically always_include_ids (set(event_id)): set of event ids to specifically
include (unless sender is ignored) include (unless sender is ignored)
apply_retention_policies (bool): Whether to filter out events that's older than
allowed by the room's retention policy. Useful when this function is called
to e.g. check whether a user should be allowed to see the state at a given
event rather than to know if it should send an event to a user's client(s).
Returns: Returns:
Deferred[list[synapse.events.EventBase]] Deferred[list[synapse.events.EventBase]]
@ -86,13 +95,14 @@ def filter_events_for_client(
erased_senders = yield storage.main.are_users_erased((e.sender for e in events)) erased_senders = yield storage.main.are_users_erased((e.sender for e in events))
room_ids = set(e.room_id for e in events) if apply_retention_policies:
retention_policies = {} room_ids = set(e.room_id for e in events)
retention_policies = {}
for room_id in room_ids: for room_id in room_ids:
retention_policies[room_id] = yield storage.main.get_retention_policy_for_room( retention_policies[
room_id room_id
) ] = yield storage.main.get_retention_policy_for_room(room_id)
def allowed(event): def allowed(event):
""" """
@ -113,7 +123,7 @@ def filter_events_for_client(
# Don't try to apply the room's retention policy if the event is a state event, as # Don't try to apply the room's retention policy if the event is a state event, as
# MSC1763 states that retention is only considered for non-state events. # MSC1763 states that retention is only considered for non-state events.
if not event.is_state(): if apply_retention_policies and not event.is_state():
retention_policy = retention_policies[event.room_id] retention_policy = retention_policies[event.room_id]
max_lifetime = retention_policy.get("max_lifetime") max_lifetime = retention_policy.get("max_lifetime")